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Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Cell cycle-regulated manganese superoxide dismutase activity via reversible  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

cycle-regulated manganese superoxide dismutase activity via reversible cycle-regulated manganese superoxide dismutase activity via reversible phosphorylation Demet Candas University of California Davis Abstract The constant stress environment that the cells live in required the development of defense systems against free radical and radiation insults. One of the major antioxidant enzymes responsible for detoxifying free radical species is manganese superoxide dismutase (MnSOD, Sod2), which is specifically localized into the mitochondria of cells. MnSOD catalyzes the conversion of two molecules of superoxide anion into water and hydrogen peroxide, the latter of which is then further oxidized to water. The significance of the role of MnSOD activity was shown by the studies showing that the loss or deficiency of MnSOD sensitize cells to ionizing

2

Engineering and characterization of human manganese superoxide dismutase mutants with high activity and low  

E-Print Network [OSTI]

Engineering and characterization of human manganese superoxide dismutase mutants with high activity2 and Huimin Zhao1 1 Departments of Chemical Engineering and Biomolecular Engineering, and Chemistry. Each monomer has at its center a manganese (II) / (III) ion, which is surrounded in a trigonal

Zhao, Huimin

3

Models of Superoxide Dismutases  

SciTech Connect (OSTI)

In this review we have focused much of our discussion on the mechanistic details of how the native enzymes function and how mechanistic developments/insights with synthetic small molecule complexes possessing SOD activity have influenced our understanding of the electron transfer processes involved with the natural enzymes. A few overriding themes have emerged. Clearly, the SOD enzymes operate at near diffusion controlled rates and to achieve such catalytic turnover activity, several important physical principles must be operative. Such fast electron transfer processes requires a role for protons; i.e., proton-coupled electron transfer (''H-atom transfer'') solves the dilemma of charge separation developing in the transition state for the electron transfer step. Additionally, outer-sphere electron transfer is likely a most important pathway for manganese and iron dismutases. This situation arises because the ligand exchange rates on these two ions in water never exceed {approx}10{sup +7} s{sup -1}; consequently, 10{sup +9} catalytic rates require more subtle mechanistic insights. In contrast, copper complexes can achieve diffusion controlled (>10{sup +9}) exchange rates in water; thus inner-sphere electron transfer processes are more likely to be operative in the Cu/Zn enzymes. Recent studies have continued to expand our understanding of the mechanism of action of this most important class of redox active enzymes, the superoxide dismutases, which have been critical in the successful adaptation of life on this planet to an oxygen-based metabolism. The design of SOD mimic drugs, synthetic models compounds that incorporate this superoxide dismutase catalytic activity and are capable of functioning in vivo, offers clear potential benefits in the control of diseases, ranging from the control of neurodegenerative conditions, such as Parkinson's or Alzheimer's disease, to cancer.

Cabelli, Diane E.; Riley, Dennis; Rodriguez, Jorge A.; Valentine, Joan Selverstone; Zhu, Haining

1998-05-20T23:59:59.000Z

4

Mitochondrial localization of fission yeast manganese superoxide dismutase is required for its lysine acetylation and for cellular stress resistance and respiratory growth  

SciTech Connect (OSTI)

Research highlights: {yields} Fission yeast manganese superoxide dismutase (MnSOD) is acetylated. {yields} The mitochondrial targeting sequence (MTS) is required for the acetylation of MnSOD. {yields} The MTS is not crucial for MnSOD activity, but is important for respiratory growth. {yields} Posttranslational regulation of MnSOD differs between budding and fission yeast. -- Abstract: Manganese-dependent superoxide dismutase (MnSOD) is localized in the mitochondria and is important for oxidative stress resistance. Although transcriptional regulation of MnSOD has been relatively well studied, much less is known about the protein's posttranslational regulation. In budding yeast, MnSOD is activated after mitochondrial import by manganese ion incorporation. Here we characterize posttranslational modification of MnSOD in the fission yeast Schizosaccharomyces pombe. Fission yeast MnSOD is acetylated at the 25th lysine residue. This acetylation was diminished by deletion of N-terminal mitochondrial targeting sequence, suggesting that MnSOD is acetylated after import into mitochondria. Mitochondrial localization of MnSOD is not essential for the enzyme activity, but is crucial for oxidative stress resistance and growth under respiratory conditions of fission yeast. These results suggest that, unlike the situation in budding yeast, S. pombe MnSOD is already active even before mitochondrial localization; nonetheless, mitochondrial localization is critical to allow the cell to cope with reactive oxygen species generated inside or outside of mitochondria.

Takahashi, Hidekazu, E-mail: hidetakahashi@riken.jp [Chemical Genetics Laboratory/Chemical Genomics Research Group, RIKEN Advanced Science Institute, Wako, Saitama 351-0198 (Japan)] [Chemical Genetics Laboratory/Chemical Genomics Research Group, RIKEN Advanced Science Institute, Wako, Saitama 351-0198 (Japan); Suzuki, Takehiro [Biomolecular Characterization Team, RIKEN Advanced Science Institute, Wako, Saitama 351-0198 (Japan) [Biomolecular Characterization Team, RIKEN Advanced Science Institute, Wako, Saitama 351-0198 (Japan); CREST Research Project, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012 (Japan); Shirai, Atsuko; Matsuyama, Akihisa [Chemical Genetics Laboratory/Chemical Genomics Research Group, RIKEN Advanced Science Institute, Wako, Saitama 351-0198 (Japan)] [Chemical Genetics Laboratory/Chemical Genomics Research Group, RIKEN Advanced Science Institute, Wako, Saitama 351-0198 (Japan); Dohmae, Naoshi [Biomolecular Characterization Team, RIKEN Advanced Science Institute, Wako, Saitama 351-0198 (Japan) [Biomolecular Characterization Team, RIKEN Advanced Science Institute, Wako, Saitama 351-0198 (Japan); CREST Research Project, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012 (Japan); Yoshida, Minoru, E-mail: yoshidam@riken.jp [Chemical Genetics Laboratory/Chemical Genomics Research Group, RIKEN Advanced Science Institute, Wako, Saitama 351-0198 (Japan) [Chemical Genetics Laboratory/Chemical Genomics Research Group, RIKEN Advanced Science Institute, Wako, Saitama 351-0198 (Japan); CREST Research Project, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012 (Japan)

2011-03-04T23:59:59.000Z

5

THE ROLE AND EVOLUTION OF SUPEROXIDE DISMUTASES IN ALGAE1 Felisa Wolfe-Simon,2  

E-Print Network [OSTI]

and Coastal Sciences, Rutgers University, 71 Dudley Road, New Brunswick, New Jersey 08901, USA and Paul G, Rutgers University, 71 Dudley Road, New Brunswick, New Jersey 08901, USA; and Department of Geological, USA Superoxide dismutases (SOD) catalyze the dis- proportionation of the potentially destructive

Falkowski, Paul G.

6

Parallel Polarization EPR Characterization of the Mn(III) Center of Oxidized Manganese Superoxide  

E-Print Network [OSTI]

Parallel Polarization EPR Characterization of the Mn(III) Center of Oxidized Manganese Superoxide polarization CW-EPR to investigate the paramagnetic Mn3+ ion of the MnSOD enzyme from Escherichia coli with a positive axial zero-field splitting value, D, are arranged as shown in Figure 1. An EPR signal from the Mn

Miller, Anne-Frances

7

Effects of Altered Levels of Extracellular Superoxide Dismutase and Irradiation on Hippocampal Neurogenesis in Female Mice  

SciTech Connect (OSTI)

Purpose: Altered levels of extracellular superoxide dismutase (EC-SOD) and cranial irradiation have been shown to affect hippocampal neurogenesis. However, previous studies were only conducted in male mice, and it was not clear if there was a difference between males and females. Therefore, female mice were studied and the results compared with those generated in male mice from an earlier study. Methods and Materials: Female wild-type, EC-SOD-null (KO), and EC-SOD bigenic mice with neuronal-specific expression of EC-SOD (OE) were subjected to a single dose of 5-Gy gamma rays to the head at 8 weeks of age. Progenitor cell proliferation, differentiation, and long-term survival of newborn neurons were determined. Results: Similar to results from male mice, EC-SOD deficiency and irradiation both resulted in significant reductions in mature newborn neurons in female mice. EC-SOD deficiency reduced long-term survival of newborn neurons whereas irradiation reduced progenitor cell proliferation. Overexpression of EC-SOD corrected the negative impacts from EC-SOD deficiency and irradiation and normalized the production of newborn neurons in OE mice. Expression of neurotrophic factors brain-derived neurotrophic factor and neurotrophin-3 were significantly reduced by irradiation in wild-type mice, but the levels were not changed in KO and OE mice even though both cohorts started out with a lower baseline level. Conclusion: In terms of hippocampal neurogenesis, EC-SOD deficiency and irradiation have the same overall effects in males and females at the age the studies were conducted.

Zou, Yani [Department of Neurology and Neurological Sciences, Stanford University, Stanford, California (United States); Leu, David [Department of Neurology and Neurological Sciences, Stanford University, Stanford, California (United States); Palo Alto Institute of Research and Education, Palo Alto, California (United States); Chui, Jennifer [Department of Neurology and Neurological Sciences, Stanford University, Stanford, California (United States); Fike, John R. [Departments of Neurosurgery and Radiation Oncology, University of California, San Francisco, California (United States); Huang, Ting-Ting, E-mail: tthuang@stanford.edu [Department of Neurology and Neurological Sciences, Stanford University, Stanford, California (United States); VA Palo Alto Health Care System, Palo Alto, California (United States)

2013-11-15T23:59:59.000Z

8

Mitochondrial matrix copper complex used in metallation of cytochrome oxidase and superoxide dismutase  

E-Print Network [OSTI]

1 Mitochondrial matrix copper complex used in metallation of cytochrome oxidase and superoxide title: Mitochondrial copper transport * Address correspondence to: Dennis Winge, University of Utah.winge@hsc.utah.edu A mitochondrial matrix copper ligand (CuL) complex, conserved in mammalian cells, is shown for the first time

Paris-Sud XI, Université de

9

Role of copper in the regulation of CU, ZN-superoxide dismutase in human K562 erythroleukemia cells and human fibroblasts  

E-Print Network [OSTI]

Activation of the enzyme CU2Zn2-SUperoxide dismutase (CuZnSOD) by its copper cofactor was studied in K562 erythroleukemia cells and skin fibroblasts. K562 cells were incubated in medium supplemented with 0-50 IIM CUC12 or ZnCI2 for 24 h and extracts...

Yu, Dan

1994-01-01T23:59:59.000Z

10

Manganese Superoxide Dismutase Regulates a Metabolic Switch during the Mammalian Cell Cycle  

Science Journals Connector (OSTI)

...changes in cellular redox environment, and mitochondrial function...shift toward a more oxidizing environment during S- and G2 phase could...89 and 202 of MnSOD, and engineer expression vectors of wild-type...a shift in cellular redox environment. This study investigates...

Ehab H. Sarsour; Amanda L. Kalen; Zhen Xiao; Timothy D. Veenstra; Leena Chaudhuri; Sujatha Venkataraman; Philip Reigan; Garry R. Buettner; and Prabhat C. Goswami

2012-08-01T23:59:59.000Z

11

Nitric Oxide Enhances the Manganese Superoxide Dismutase-dependent Suppression of Proliferation in HT-1080 Fibrosarcoma Cells  

Science Journals Connector (OSTI)

...study, the increase in sensitivity to NO does not appear to be attributed to elevated...activity Greenwald R. A. eds. . CRC Handbook of Methods for Oxygen Radical Research...in the oxidizing capacity of the cells does not appear to mediate the inhibition of...

J. Andres Melendez; Raichal P. Melathe; Ana M. Rodriguez; Joseph E. Mazurkiewicz; and Kelvin J. A. Davies

1999-09-01T23:59:59.000Z

12

Superoxide dismutase activity and novel reactions with hydrogen peroxide of histidine-containing nickel(II)-oligopeptide complexes and nickel(II)-induced structural changes in synthetic DNA  

Science Journals Connector (OSTI)

At physiologic pH values, histidine-containing nickel(II) oligopeptides reduced the flux of superoxide anion (O2) generated in the hypoxanthine/xanthine oxidase system. The postulated involvement of the Ni(III)/N...

E. Nieboer; R. T. Tom; F. E. Rossetto

13

Complete Elimination of Colorectal Tumor Xenograft by Combined Manganese Superoxide Dismutase with Tumor Necrosis Factor–Related Apoptosis-Inducing Ligand Gene Virotherapy  

Science Journals Connector (OSTI)

...showed that the production of hydrogen peroxide derived...Materials and Methods Cell lines and culture...showed that the production of hydrogen peroxide derived...Induction Gene Therapy methods Humans Hydrogen Peroxide metabolism...

Yanhong Zhang; Jinfa Gu; Lili Zhao; Lingfeng He; Wenbin Qian; Jinhui Wang; Yigang Wang; Qijun Qian; Cheng Qian; Jian Wu; and Xin Yuan Liu

2006-04-15T23:59:59.000Z

14

oiwa, a Female Gametophytic Mutant Impaired in a Mitochondrial Manganese-Superoxide Dismutase, Reveals Crucial Roles for Reactive Oxygen Species during Embryo Sac Development and Fertilization in Arabidopsis  

Science Journals Connector (OSTI)

...wild-type pistils (assessed by Kruskal-Wallis nonparametric one-way analysis...significance (*P 0.001, Kruskal-Wallis). A total of 69 embryo sacs...Ti-Control. Statistical Analysis The Kruskal-Wallis test on ranks was performed for...

María Victoria Martin; Diego Fernando Fiol; Venkatesan Sundaresan; Eduardo Julián Zabaleta; Gabriela Carolina Pagnussat

2013-05-07T23:59:59.000Z

15

Crystal Structure of the Bacillus subtilis Superoxide Dismutase  

SciTech Connect (OSTI)

The sodA gene of Bacillus subtilis was expressed in Escherichia coli, purified and crystallized. The crystal structure of MnSOD was solved by molecular replacement with four dimers per asymmetric unit and refined to an R factor of 21.1% at 1.8 {angstrom} resolution. The dimer structure is very similar to that of the related enzyme from B. anthracis. Larger structural differences were observed with the human MnSOD, which has one less helix in the helical domain and a longer loop between two -strands and also showed differences in three amino acids at the intersubunit interface in the dimer compared with the two bacterial MnSODs. These structural differences can be exploited in the design of drugs that selectively target the Bacillus enzymes.

Liu, Ping; Ewis, H.E.; Huang, Y.-J; Lu, C.-D.; Tai, P.C.; Weber, Irene T. (GSU)

2008-06-01T23:59:59.000Z

16

of  

E-Print Network [OSTI]

Redox up-regulated expression of rat liver manganese superoxide dismutase and Bcl-2 by thyroid hormone is associated with inhibitor

Virginia Fernández; Gladys Tapia; Patricia Varela; Iván Castillo; Catalina Mora; Francisco Moya; Myriam Orellana; Luis A Videla

17

Neutralization of mitochondrial superoxide by superoxide dismutase 2 promotes bacterial clearance and regulates phagocyte numbers in zebrafish  

Science Journals Connector (OSTI)

...University, Raleigh, NC, 27067 USA Mitochondria are primarily known as the location for the electron transport chain and energy production in cells. More recently, mitochondria have been shown to be signaling centers for apoptosis and inflammation...

E. M. Peterman; C Sullivan; M. F. Goody; I Rodriguez-Nunez; J. A. Yoder; C. H. Kim

2014-11-10T23:59:59.000Z

18

Synthesis, Structure, and Properties of Low-Spin Manganese(III)-Poly(pyrazolyl)borate Complexes  

E-Print Network [OSTI]

.g., catalase, peroxidase, superoxide dismutase),2,3 in the oxygen-evolving center (OEC) of photosystem II,4, indicates absence of the characteristic Jahn-Teller distortion of a high-spin d4 center. N-Mn-N bite angles

Baik, Mu-Hyun

19

Iron Superoxide Dismutase Protects against Chilling Damage in the Cyanobacterium Synechococcus species PCC79421  

E-Print Network [OSTI]

and Murata, 1996). In support of this hypoth- esis, genetic manipulation of desaturase genes in cyanobac- teria showed that increased desaturation of membrane lip- ids, which lowers the freezing point

Thomas, Dave

20

Chlorovirus PBCV-1 Encodes an Active Copper-Zinc Superoxide Dismutase  

Science Journals Connector (OSTI)

...packaged in its capsid, while NY-2A does not encode a cvSOD. These results are...C. variabilis ( ADIC01003810.1 ), does not. Excluding viruses, the best BLAST...211-220. In RA Greenwald (ed), CRC handbook of methods for oxygen radical species...

Ming Kang; Garry A. Duncan; Charles Kuszynski; George Oyler; Jiayin Zheng; Donald F. Becker; James L. Van Etten

2014-08-20T23:59:59.000Z

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Manganese carbonate additive for manganese dioxide-containing nonaqueous cells  

SciTech Connect (OSTI)

A nonaqueous cell employing a manganese dioxide-containing solid cathode having a minor amount of manganese carbonate to improve the pulse voltage capability of the cell at low temperatures such as -10/sup 0/ C.

Langan, R.A.

1984-10-23T23:59:59.000Z

22

CHARACTERIZATION OF THE STRUCTURE AND REACTIVITY OF A NICKEL(II)-TRIPEPTIDE MIMIC OF NICKEL SUPEROXIDE DISMUTASE  

E-Print Network [OSTI]

. However, prior to this work, the structure and chemical reactivity of the nickel-peptide complex were undefined. The work presented herein involves structural and reactivity investigations of the MAP-tag bound with NiII in the dianionic complex [Ni-NCC]2...

Glass, Amanda M.

2012-08-31T23:59:59.000Z

23

ACE1, a copper-dependent transcription factor, activates expression of the yeast copper, zinc superoxide dismutase gene  

Science Journals Connector (OSTI)

...experiment, CUPi message was dramatically...with -strict -conservation of four guanosine...galactosidase message production. Strains...15), including conservation of the seven G residues...it is simply an energy-saving device-i...by United States Public Health Service Grants...

E B Gralla; D J Thiele; P Silar; J S Valentine

1991-01-01T23:59:59.000Z

24

An Intracellular Iron Chelator Pleiotropically Suppresses Enzymatic and Growth Defects of Superoxide Dismutase-DeficientEscherichia coli  

Science Journals Connector (OSTI)

...recycle it into a cluster repair process. This idea is speculative and, since the repair process has not been biochemically...one can imagine that a pipeline must deliver iron from transporters...not easily reenter that pipeline. The pipeline idea has...

Sujatha Maringanti; James A. Imlay

1999-06-01T23:59:59.000Z

25

Anion Binding Properties of Reduced and Oxidized Iron-Containing Superoxide Dismutase Reveal No Requirement for Tyrosine 34  

E-Print Network [OSTI]

nuclear magnetic relaxation dispersion (NMRD) results. Thus, we propose that two F- ions can bind magnetic resonance; NMRD, nuclear magnetic relaxation dispersion; OCN- , cyanate; PIPES, piperazine circular dichroism; MES, 2-(N-morpholino) ethane sulfonic acid; MnSOD, Mn-containing SOD; NMR, nuclear

Miller, Anne-Frances

26

It's Elemental - The Element Manganese  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Chromium Chromium Previous Element (Chromium) The Periodic Table of Elements Next Element (Iron) Iron The Element Manganese [Click for Isotope Data] 25 Mn Manganese 54.938045 Atomic Number: 25 Atomic Weight: 54.938045 Melting Point: 1519 K (1246°C or 2275°F) Boiling Point: 2334 K (2061°C or 3742°F) Density: 7.3 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 4 Group Number: 7 Group Name: none What's in a name? From the Latin word for magnet, magnes. Say what? Manganese is pronounced as MAN-ge-nees. History and Uses: Proposed to be an element by Carl Wilhelm Scheele in 1774, manganese was discovered by Johan Gottlieb Gahn, a Swedish chemist, by heating the mineral pyrolusite (MnO2) in the presence of charcoal later that year.

27

Treating electrolytic manganese residue with alkaline additives for stabilizing manganese and removing ammonia  

Science Journals Connector (OSTI)

Electrolytic manganese residue (EMR) from the electrolytic manganese industry is a solid waste containing mainly calcium sulfate dihydrate and quartzite. It is impossible to directly use the EMR as a building mat...

Changbo Zhou; Jiwei Wang; Nanfang Wang

2013-11-01T23:59:59.000Z

28

Superoxide Mediates Acute Liver Injury in Irradiated Mice Lacking Sirtuin 3  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

Aims: This study determined whether acute radiation-induced liver injury seen in Sirtuin3 - / - mice after exposure to Cs-137 c-rays was mediated by superoxide anion (O2#2; - ). Results: Male wild-type (WT) and SIRT3 - / - mice were given 2 · 2Gy whole-body radiation doses separated by 24 h and livers were harvested 20 h after the second dose. Ex vivo measurements in fresh frozen liver sections demonstrated 50% increases in dihydroethidium oxidation from SIRT3 - / - animals, relative to WT animals, before irradiation, but this increase was not detected 20 h after radiation exposure. In addition, irradiated livers from SIRT3 - / - animals showed significant hydropic degeneration, loss of MitoTracker Green FM staining, increased immunohistochemical staining for 3-nitrotyrosine, loss of Ki67 staining, and increased mitochondrial localization of p53. These parameters of radiation-induced injury were significantly attenuated by an intraperitoneal injection of 2mg/kg of the highly specific superoxide dismutase mimic, GC4401, 30min before each fraction. Innovation: Sirtuin 3 (SIRT3) is believed to regulate mitochondrial oxidative metabolism and antioxidant defenses in response to acute radiation-induced liver injury. This work provides strong evidence for the causal role of O2 #2; - in the liver injury process initiated by whole-body irradiation in SIRT3 - / - mice. Conclusion: These results support the hypothesis that O2#2; - mediates acute liver injury in SIRT3 - / - animals exposed to whole-body c-radiation and suggest that GC4401 could be used as a radio-protective compound in vivo.

Coleman, Mitchell C.; Olivier, Alicia K.; Jacobus, James A.; Mapuskar, Kranti A.; Mao, Gaowei; Martin, Sean M.; Riley, Dennis P.; Gius, David; Spitz, Douglas R.

2014-01-01T23:59:59.000Z

29

New manganese catalyst for light alkane oxidation  

DOE Patents [OSTI]

Aluminophosphates containing manganese in the structural framework are employed for the oxidation of alkanes, for example the vapor phase oxidation of methane to methanol.

Durante, Vincent A. (West Chester, PA); Lyons, James E. (Wallingford, PA); Walker, Darrell W. (Visalia, CA); Marcus, Bonita K. (Radnor, PA)

1994-01-01T23:59:59.000Z

30

Addressing the Voltage Fade Issue with Lithium-Manganese-Rich...  

Broader source: Energy.gov (indexed) [DOE]

Addressing the Voltage Fade Issue with Lithium-Manganese-Rich Oxide Cathode Materials Addressing the Voltage Fade Issue with Lithium-Manganese-Rich Oxide Cathode Materials 2013 DOE...

31

Molecular Interactions of Plutonium(VI) with SyntheticManganese...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Plutonium(VI) with Synthetic Manganese-Substituted Goethite. Abstract: Plutonium(VI) sorption on the surface of well-characterized synthetic manganese-substituted goethite...

32

Drinking Water Problems: Iron and Manganese  

E-Print Network [OSTI]

Iron and manganese can give water an unpleasant taste, odor and color. In this publication you'll learn how to know whether your water contains iron or manganese and how to eliminate these contaminants with various treatment methods such as aeration...

Dozier, Monty; McFarland, Mark L.

2004-02-20T23:59:59.000Z

33

Original article Intestinal transfer of manganese  

E-Print Network [OSTI]

Original article Intestinal transfer of manganese: resemblance to and competition with calcium Y of calcium, phosphate and the sugars lactose and sorbitol on the intestinal absorption of manganese were retention of 54Mn, while phosphate decreased it. In situ ileal loop studies indicated that Mn absorption

Paris-Sud XI, Université de

34

Structural Determination of Marine Bacteriogenic Manganese Oxides  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

fig 2 Figure 2. (A) X-ray diffraction intensity data for bacteriogenic manganese oxides produced in sea water. The bottom pattern is for clean cells. (B) X-ray diffraction...

35

Promises and Challenges of Lithium- and Manganese-Rich Transition...  

Broader source: Energy.gov (indexed) [DOE]

Promises and Challenges of Lithium- and Manganese-Rich Transition-Metal Layered-Oxide Cathodes Promises and Challenges of Lithium- and Manganese-Rich Transition-Metal Layered-Oxide...

36

Multivalent Manganese Hydrazide Gels for Kubas-Type Hydrogen Storage  

Science Journals Connector (OSTI)

Manganese(II) hydrazide gels designed for Kubas-type hydrogen storage were synthesized from the reaction between bis(trimethylsilylmethyl) manganese and anhydrous hydrazine. The synthetic materials were characterized by X-ray powder diffraction, nitrogen ...

Tuan K. A. Hoang; Leah Morris; Jeremy M. Rawson; Michel L. Trudeau; David M. Antonelli

2012-04-09T23:59:59.000Z

37

Effect of Catalase/Superoxide Dismutase Mimetic EUK-134 on Damage, Inflammation, and Force Generation of the Diaphragm Muscle in mdx Mice  

E-Print Network [OSTI]

, inflammation and weakness in diaphragm and limb muscles. Dystrophin, a scaffolding protein located in the sarcolemmal cytoskeleton, helps cells to maintain their structural integrity and associates with critical cell signaling molecules that regulate cell...

Kim, Jong Hee

2010-10-12T23:59:59.000Z

38

THE STATE OF MANGANESE IN THE PHOTOSYNTHETIC APPARATUS. II. X-RAY ABSORPTION EDGE STUDIES ON MANGANESE IN PHOTOSYNTHETIC MEMBRANES  

E-Print Network [OSTI]

oxygen evolving capabilities ed X) These preparations are reported to have 4-6 manganese atoms per photochemical reaction center(

Kirby, J.A.

2013-01-01T23:59:59.000Z

39

Anthracycline Antibiotic-stimulated Superoxide, Hydrogen Peroxide, and Hydroxyl Radical Production by NADH Dehydrogenase  

Science Journals Connector (OSTI)

...supporting oxygen radical production by anthracycline drugs (4...legends. Superoxide Assay. The production of Superoxide ani nin the...7). In this study, the production of the hydroxyl radical by...tubes were rapidly sealed with rubber stoppers, and the experimental...

James H. Doroshow

1983-10-01T23:59:59.000Z

40

Manganese-Based Magnets: Manganese-Based Permanent Magnet with 40 MGOe at 200°C  

SciTech Connect (OSTI)

REACT Project: PNNL is working to reduce the cost of wind turbines and EVs by developing a manganese-based nano-composite magnet that could serve as an inexpensive alternative to rare-earth-based magnets. The manganese composite, made from low-cost and abundant materials, could exceed the performance of today’s most powerful commercial magnets at temperature higher than 200°C. Members of PNNL’s research team will leverage comprehensive computer high-performance supercomputer modeling and materials testing to meet this objective. Manganese-based magnets could withstand higher temperatures than their rare earth predecessors and potentially reduce the need for any expensive, bulky engine cooling systems for the motor and generator. This would further contribute to cost savings for both EVs and wind turbines.

None

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

E-Print Network 3.0 - angiotensin ii-mediated superoxide Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

depression of baroreflex function. FASEB J. 2002;16: 1595... by angiotensin II infusion involves increased superoxide produc- tion in the central nervous system. Circ Res......

42

Why sequence freshwater manganese depositing β-proteobacterium  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

freshwater manganese depositing β-proteobacterium freshwater manganese depositing β-proteobacterium (Siderocapsaceae)? Stream biofilms are key component of stream food webs and contain bacteria that contribute to the carbon and nitrogen cycles. A slow-growing bacterium isolated from a freshwater stream biofilm has potential bioenergy and bioremediation applications. JOSHI_001 is part of a class of bacteria that deposit iron and manganese precipitates externally to the colony early in its life cycle and could be used for fuel cells and to help clean up manganese contaminated water. Members of the Siderocapsaceae family to which JOSHI_001 belongs have been observed in biofilms for the past century, but have never before been isolated and cultivated in a laboratory environment. As a result, researchers have not been able to learn about the

43

Neutron Activation Analysis of Manganese and Sodium in Bacterial Cells  

Science Journals Connector (OSTI)

...research-article Metabolism and Products Neutron Activation Analysis of Manganese and Sodium...Columbus, Ohio 43210. The application of neutron activation analysis for mineral determinations...two elements. The results indicate that neutron activation analysis is readily applicable...

Woodrow B. Krueger; Walter E. Carey; Bruno J. Kolodzeij

1970-12-01T23:59:59.000Z

44

Xenon in Mercury-Manganese Stars  

E-Print Network [OSTI]

Previous studies of elemental abundances in Mercury-Manganese (HgMn) stars have occasionally reported the presence of lines of the ionized rare noble gas Xe II, especially in a few of the hottest stars with Teff ~ 13000--15000 K. A new study of this element has been undertaken using observations from Lick Observatory's Hamilton Echelle Spectrograph. In this work, the spectrum synthesis program UCLSYN has been used to undertake abundance analysis assuming LTE. We find that in the Smith & Dworetsky sample of HgMn stars, Xe is vastly over-abundant in 21 of 22 HgMn stars studied, by factors of 3.1--4.8 dex. There does not appear to be a significant correlation of Xe abundance with Teff. A comparison sample of normal late B stars shows no sign of Xe II lines that could be detected, consistent with the expected weakness of lines at normal abundance. The main reason for the previous lack of widespread detection in HgMn stars is probably due to the strongest lines being at longer wavelengths than the photographic blue. The lines used in this work were 4603.03A, 4844.33A and 5292.22A.

M. M. Dworetsky; J. L. Persaud; K. Patel

2008-01-16T23:59:59.000Z

45

Substantiation of proposals on standardization of the manganese content in water supplied for electrodyalysis treatment  

Science Journals Connector (OSTI)

The results of systematic investigations of the electrodialysis process of manganese-containing solutions and the impact of manganese compounds on electrochemical characteristics of ion-exchange membranes have...

L. A. Mel’nik

2011-02-01T23:59:59.000Z

46

SOFC Ohmic Resistance Reduction by HCl-Induced Removal of Manganese...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

SOFC Ohmic Resistance Reduction by HCl-Induced Removal of Manganese at the AnodeElectrolyte Interface. SOFC Ohmic Resistance Reduction by HCl-Induced Removal of Manganese at the...

47

Metals in the sporulation phosphorelay: manganese binding by the response regulator Spo0F  

Science Journals Connector (OSTI)

This paper reports the crystal structure of the response regulator Spo0F in complex with manganese and explores the differing possibilities for the involvement of manganese and magnesium in the phosphoryl transfer.

Mukhopadhyay, D.

2004-03-23T23:59:59.000Z

48

AN X-RAY ABSORPTION SPECTROSCOPY STUDY OF MANGANESE CONTAINING COMPOUNDS AND PHOTOSYNTHETIC SPINACH CHLOROPLASTS  

E-Print Network [OSTI]

oxygen evolving capabilities. These preparations are reported to have 4-6 manganese atoms per photochemical reaction center(

Kirby, Jon Allan

2012-01-01T23:59:59.000Z

49

Joining of highly aluminum-doped lanthanum strontium manganese oxide with tetragonal zirconia by plastic deformation  

E-Print Network [OSTI]

Joining of highly aluminum-doped lanthanum strontium manganese oxide with tetragonal zirconia February 2008; accepted 24 March 2008 Abstract Aluminum-doped lanthanum strontium manganese oxide, La0.77Sr at the interface. © 2008 Elsevier B.V. All rights reserved. Keywords: Lanthanum strontium aluminum manganese oxide

Dutta, Prabir K.

50

Manganese-Containing Cathode-Active Materials for Lithium-Ion Batteries  

Science Journals Connector (OSTI)

Manganese, which has a Clarke number of 0.06%,1...is the tenth-most abundant element in the earth’s crust, and has been utilized as a cathode-active material for manganese, alkaline-manganese, and lithium ... , f...

Koichi Numata

2009-01-01T23:59:59.000Z

51

Nano-sized manganese oxides as biomimetic catalysts for water oxidation in artificial photosynthesis: a review  

Science Journals Connector (OSTI)

...review-article Review articles 1004 30 36 15 Nano-sized manganese oxides as biomimetic...of about approximately 0.5 nm. Thus, nano-sized manganese compounds might be good...particles. In this paper, we focus on nano-sized manganese oxides as functional...

2012-01-01T23:59:59.000Z

52

Microstructural characteristics of chemically processed manganese oxide nanofibers  

SciTech Connect (OSTI)

Nanostructured fibrous manganese oxide cryptomelane-type hollandite powders were prepared via a chemical route. Powders were obtained by the chemical reaction of the aqueous solutions of potassium permanganate and manganese sulfate in the presence of a strong acid, followed by crystalline growth at elevated temperatures. These powders were characterized by powder X-ray diffraction (XRD), Rietveld refinement, analytical scanning electron microscopy (SEM), transmission electron microscopy (TEM) combined with micro-micro diffraction ({mu}{mu}d), and high resolution transmission electron microscopy (HRTEM). The crystalline structure, morphology, crystallite size, fiber growth direction, and structural defects are discussed.

Xiao, T.D. [CIMAV, Chihuahua (Mexico). Centro de Investigacion en Materiales Avanzados] [CIMAV, Chihuahua (Mexico). Centro de Investigacion en Materiales Avanzados; [Univ. of Connecticut, Storrs, CT (United States). Connecticut Advanced Technology Center for Precision Manufacturing; Bokhimi; Benaissa, M.; Perez, R.; Yacaman, M.J. [Univ. Nacional Autonoma de Mexico, Mexico City (Mexico). Inst. de Fisica] [Univ. Nacional Autonoma de Mexico, Mexico City (Mexico). Inst. de Fisica; Strutt, P.R. [Univ. of Connecticut, Storrs, CT (United States). Connecticut Advanced Technology Center for Precision Manufacturing] [Univ. of Connecticut, Storrs, CT (United States). Connecticut Advanced Technology Center for Precision Manufacturing

1997-04-01T23:59:59.000Z

53

Transuranic interfacial reaction studies on manganese oxidemineral surfaces  

SciTech Connect (OSTI)

Several DOE sites have been contaminated by transuranicradionuclide (TRU) discharges including neptunium and plutonium. Theirinteraction with the surrounding geological media can affect thetransport and remediation of these radionuclides in the environment.Manganese based minerals, present as minor phases in the vadose zone, canpreferentially sequester TRU over other minerals present in largerquantities. The objective of this project is to understand theinteractions between plutonium and neptunium and manganese oxyhydroxideminerals to predict potential hazards they represent to the environment,as well as to provide important scientific information for the design ofeffective remediation strategies for contaminated DOE sites.

Shaughnessy, Dawn A.; Nitsche, Heino; Serne, R. Jeffrey; Shuh,David K.; Waychunas, Glenn A.; Booth, Corwin H.; Cantrell, Kirk J.

2002-05-15T23:59:59.000Z

54

THE STATE OF MANGANESE IN THE PHOTOSYNTHETIC APPARATUS. I. EXAFS STUDIES ON CHLOROPLASTS AND di-u-oxo BRIDGED di-MANGANESE MODEL COMPOUNDS  

SciTech Connect (OSTI)

Extended X-ray Absorption Fine Structure (EXAFS) studies on the manganese contained in spinach chloroplasts and on certain di-u-oxo bridged manganese dimers of the form (X{sub 2}Mn)O{sub 2}(MnX{sub 2} (X=2,2'-bypyridine and 1,10-phenanthroline) are reported. From these studies, the manganese associated with photosynthetic oxygen evolution is suggested to occur as a bridged transition metal dimer with most likely another manganese. Extensive details on the analysis are included.

Kirby, J.A.; Robertson, A.S.; Smith, J.P.; Thompson, A.C.; Thompson, A.C.; Klein, M.P.

1980-11-01T23:59:59.000Z

55

Manganese Based Oxidative Technologies For Water/Wastewater Treatment  

E-Print Network [OSTI]

NaNO3. The vessel was then spiked with manganese oxide to achieve a specified oxide concentration. The reactor solution was stirred using a Teflon coated magnetic stirrer for an hour before the reaction’s initiation. This process ensured...

Desai, Ishan

2013-08-27T23:59:59.000Z

56

Manganese-oxidizing photosynthesis before the rise of cyanobacteria  

E-Print Network [OSTI]

Manganese-oxidizing photosynthesis before the rise of cyanobacteria Jena E. Johnsona,1 , Samuel M) The emergence of oxygen-producing (oxygenic) photosynthesis fundamentally transformed our planet; however biological innovation-- the evolution of oxygenic photosynthesis (3, 4). Several bio- chemical attributes

Fischer, Woodward

57

Expression of p53 Enhances Selenite-Induced Superoxide Production and Apoptosis in Human Prostate Cancer Cells  

Science Journals Connector (OSTI)

...apoptosis was mediated by ROS production (21-25). We also showed...was mediated by superoxide production via posttranscriptional modification...determined that superoxide production by selenite was also p53 dependent...PBS thrice, scraping with a rubber policeman in 10-mL PBS...

Rui Zhao; Nong Xiang; Frederick E. Domann; and Weixiong Zhong

2006-02-15T23:59:59.000Z

58

Anthracycline Antibiotic-stimulated Superoxide, Hydrogen Peroxide, and Hydroxyl Radical Production by NADH Dehydrogenase  

Science Journals Connector (OSTI)

...ani nand hydrogen peroxide production by NADH dehydrogenase...MATERIALS AND METHODS Materials...Superoxide production by NADH dehydrogenase...with the hydrogen ion concentration...Materials and Methods." The paired...ani nand hydrogen peroxide...elicit methane production from DMSO...Materials and Methods." In these...

James H. Doroshow

1983-10-01T23:59:59.000Z

59

The relationship of nutritional manganese to the development of postmenopausal osteopenia in rats  

E-Print Network [OSTI]

intake, and other studies have not demonstrated a long-term effect of calcium supplementation. Minerals other than calcium are essential to the integrity of bone tissue. Among these are phosphorus, copper, fluorine, zinc and manganese. Manganese... and Lowther 1976). Original investigations of bone mineralization, density, strength, and ash content have been noted to be lower in manganese deficiency, with calcium and phosphorus remaining unchanged (Asling and Hurley 1963). Bone density and breaking...

Miyasato, Jan Leiko

2012-06-07T23:59:59.000Z

60

Thermal expansion of manganese dioxide using high-temperature in situ X-ray diffraction  

Science Journals Connector (OSTI)

The thermal expansion behaviour of manganese dioxide, an important battery material, is reported using high-temperature in situ X-ray diffraction between 298 and 673 K.

Dose, W.M.

2013-08-03T23:59:59.000Z

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Periadolescent oral manganese exposure affects conditioned place preference by cocaine and conditioned place aversion by lithium chloride in rats  

E-Print Network [OSTI]

Manganese neurotoxicity compromises basal ganglia functions that could affect the limbic system and drug sensitivity. Male rats were orally exposed to manganese chloride (0, 100, 200 mg/kg/day Mn) for 15 days starting at postnatal day (PND) 28...

Lee, Samuel Ming Hin

2013-02-22T23:59:59.000Z

62

Interrelated influence of superoxides and free fatty acids over mitochondrial uncoupling in skeletal muscle  

Science Journals Connector (OSTI)

Mitochondrial uncoupling protein 3 (UCP3)-mediated uncoupling has been postulated to depend on several factors, including superoxides, free fatty acids (FFAs), and fatty acid hydroperoxides and/or their derivatives. We investigated whether there is an interrelation between endogenous mitochondrial superoxides and fatty acids in inducing skeletal muscle mitochondrial uncoupling, and we speculated on the possible involvement of UCP3 in this process. In the absence of FFAs, no differences in proton-leak kinetic were detected between succinate-energized mitochondria respiring in the absence or presence of rotenone, despite a large difference in complex I superoxide production. The addition of either arachidic acid or arachidonic acid induced an increase in proton-leak kinetic, with arachidonic acid having the more marked effect. The uncoupling effect of arachidic acid was independent of the presence of GDP, rotenone and vitamin E, while that of arachidonic acid was dependent on these factors. These data demonstrate that FFA and O2? play interrelated roles in inducing mitochondrial uncoupling, and we hypothesize that a likely formation of mitochondrial fatty acid hydroperoxides is a key event in the arachidonic acid-induced GDP-dependent inhibition of mitochondrial uncoupling.

Assunta Lombardi; Paola Grasso; Maria Moreno; Pieter de Lange; Elena Silvestri; Antonia Lanni; Fernando Goglia

2008-01-01T23:59:59.000Z

63

Where plants make oxygen: a structural model for the photosynthetic oxygen-evolving manganese cluster  

Science Journals Connector (OSTI)

...MANGANESE O2-EVOLVING COMPLEX AND THE IRON QUINONE ACCEPTOR COMPLEX IN PHOTOSYSTEM-II...MANGANESE(III) - ANALOGS OF THE DI-IRON(III) CENTER IN HEMERYTHRIN, JOURNAL...Mn(IV)(sal)2(bipy) (acac, acetylacetonate; bipy, R:Mn(II) bipyridine; and...

VK Yachandra; VJ DeRose; MJ Latimer; I Mukerji; K Sauer; MP Klein

1993-04-30T23:59:59.000Z

64

Coupled anoxic nitrification/manganese reduction in marine sediments STEFAN HULTH,1,  

E-Print Network [OSTI]

Coupled anoxic nitrification/manganese reduction in marine sediments STEFAN HULTH,1, * ROBERT C distributions of oxygen, manganese, and nitrogen from hemipelagic and shelf sediments sometimes indicate a close by biological reworking of Mn-oxide-rich surface sediments into underlying anoxic zones. Surface sediment from

Boyer, Edmond

65

Superoxide reductase from Desulfoarculus baarsii: reaction mechanism and role of glutamate 47 and lysine 48 in catalysis  

E-Print Network [OSTI]

Superoxide reductase (SOR) is a small metalloenzyme that catalyzes reduction of O(2)(*)(-) to H(2)O(2) and thus provides an antioxidant mechanism against superoxide radicals. Its active site contains an unusual mononuclear ferrous center, which is very efficient during electron transfer to O(2)(*)(-) [Lombard, M., Fontecave, M., Touati, D., and Nivi{\\`e}re, V. (2000) J. Biol. Chem. 275, 115-121]. The reaction of the enzyme from Desulfoarculus baarsii with superoxide was studied by pulse radiolysis methods. The first step is an extremely fast bimolecular reaction of superoxide reductase with superoxide, with a rate constant of (1.1 +/- 0.3) x 10(9) M(-1) s(-1). A first intermediate is formed which is converted to a second one at a much slower rate constant of 500 +/- 50 s(-1). Decay of the second intermediate occurs with a rate constant of 25 +/- 5 s(-1). These intermediates are suggested to be iron-superoxide and iron-peroxide species. Furthermore, the role of glutamate 47 and lysine 48, which are the closest...

Lombard, M; Touati, D; Fontecave, M; Nivière, V

2015-01-01T23:59:59.000Z

66

Growth of manganese filled carbon nanofibers in the vapor phase  

Science Journals Connector (OSTI)

We report the vapor phase growth of partially filled graphitic fibers, 20-30 nm in diameter and up to a micron in length, during a manganese catalyzed carbon electric arc discharge. The fiber morphology resembles that of catalytic chemical vapor deposited carbon filaments but the inside hollow contains intermittent precipitates and continuous filling of Mn that at times occupy >50% of fiber lengths. Transmission electron microscopy and electron energy loss line spectra show that the fillings form as solid cores and may correspond to pure metal.

P. M. Ajayan; C. Colliex; J. M. Lambert; P. Bernier; L. Barbedette; M. Tence; O. Stephan

1994-03-14T23:59:59.000Z

67

Magnon damping by magnon-phonon coupling in manganese perovskites  

SciTech Connect (OSTI)

Inelastic neutron scattering was used to systematically investigate the spin-wave excitations (magnons) in ferromagnetic manganese perovskites. In spite of the large differences in the Curie temperatures (T{sub C}'s) of different manganites, their low-temperature spin waves have very similar dispersions with the zone-boundary magnon softening and broadening that cannot be explained by the canonical double exchange mechanism. From the wave-vector dependence of the magnon lifetime effects and its correlation with the dispersions of the optical-phonon modes, we argue that a strong magnetoelastic (magnon-phonon) coupling is responsible for the observed low-temperature anomalous spin dynamical behavior of the manganites. (c) 2000 The American Physical Society.

Dai, Pengcheng [Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)] [Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States); Hwang, H. Y. [Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States)] [Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States); Zhang, Jiandi [Department of Physics, Florida International University, University Park, Miami, Florida 33199 (United States)] [Department of Physics, Florida International University, University Park, Miami, Florida 33199 (United States); Fernandez-Baca, J. A. [Oak Ridge Natinal Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)] [Oak Ridge Natinal Laboratory, Oak Ridge, Tennessee 37831-6393 (United States); Cheong, S.-W. [Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States) [Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States); Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855 (United States); Kloc, C. [Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States)] [Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States); Tomioka, Y. [Joint Research Center for Atom Technology (JRCAT), Tsukuba 305 8562, (Japan)] [Joint Research Center for Atom Technology (JRCAT), Tsukuba 305 8562, (Japan); Tokura, Y. [Joint Research Center for Atom Technology (JRCAT), Tsukuba 305 8562, (Japan) [Joint Research Center for Atom Technology (JRCAT), Tsukuba 305 8562, (Japan); Department of Applied Physics, University of Tokyo, Tokyo 113 8656, (Japan)

2000-04-01T23:59:59.000Z

68

Hydrothermal manganese plumes in the Mid-Atlantic Ridge rift valley  

Science Journals Connector (OSTI)

... Fracture Zone at 1G? in August 1984. Manganese was measured on board ship by flameless atomic absorption after preconcentration with oxine9 to give a detection limit of 0.05 nmol ...

G. Klinkhammer; P. Rona; M. Greaves; H. Elderfield

1985-04-25T23:59:59.000Z

69

Structural Basis for the Metal-Selective Activation of the Manganese Transport Regulator of Bacillus subtilis,  

E-Print Network [OSTI]

-containing cofactor is at the heart of the oxygen-evolving complex (2), and in mammals, a manganese, UniVersity of Texas M. D. Anderson Cancer Center, Unit 1000, Houston, Texas 77030 ReceiVed NoVember 27

Lycan, Deborah E.

70

Influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese  

E-Print Network [OSTI]

Trace metal cycling is one of many processes that influence ocean ecosystem dynamics. Cobalt, iron, and manganese are redox active trace metal micro-nutrients with oceanic distributions that are influenced by both biological ...

Noble, Abigail Emery

2012-01-01T23:59:59.000Z

71

Effect of manganese addition on hydrogen storage performance of vanadium-based BCC hydrogen storage alloys  

Science Journals Connector (OSTI)

The effect of manganese addition on hydrogen storage performance of vanadium-based BCC alloys was ... plateau pressure and a reverse effect on maximum hydrogen storage capacity. However, an effective hydrogen storage

Chan-Yeol Seo; Zhao-Liang Zhang; Jin-Ho Kim…

2002-07-01T23:59:59.000Z

72

On the Martensitic Transformation in f.c.c. Manganese Alloys. I. Measurements  

Science Journals Connector (OSTI)

...c. Manganese Alloys. I. Measurements R. D. Lowde R. T. Harley...cube axis directions. Phonon energy measurements, made to an accuracy of about...tenth of a reciprocal lattice unit of the origin. The anomalous...

1981-01-01T23:59:59.000Z

73

Spin-dependent electron transport in zinc- and manganese-doped adenine molecules  

SciTech Connect (OSTI)

The spin-dependent electron transport properties of zinc- and manganese-doped adenine molecules connected to zigzag graphene leads are studied in the zero bias regime using the non-equilibrium Green's function method. The conductance of the adenine molecule increased and became spin-dependent when a zinc or manganese atom was doped into the molecules. The effects of a transverse electric field on the spin-polarization of the transmitted electrons were investigated and the spin-polarization was controlled by changing the transverse electric field. Under the presence of a transverse electric field, both the zinc- and manganese-doped adenine molecules acted as spin-filters. The maximum spin-polarization of the manganese-doped adenine molecule was greater than the molecule doped with zinc.

Simchi, Hamidreza, E-mail: simchi@iust.ac.ir [Department of Physics, Iran University of Science and Technology, Narmak, Tehran 16844 (Iran, Islamic Republic of); Semiconductor Technology Center, Tehran 16844 (Iran, Islamic Republic of); Esmaeilzadeh, Mahdi, E-mail: mahdi@iust.ac.ir; Mazidabadi, Hossein [Department of Physics, Iran University of Science and Technology, Narmak, Tehran 16844 (Iran, Islamic Republic of)

2014-01-28T23:59:59.000Z

74

Commercialization of cryptomelane-type manganese oxide (OMS-2) nanowire paper oil sorbent  

E-Print Network [OSTI]

Cryptomelane-type Manganese oxide (OMS-2, a group of Octahedral Molecular Sieves) nanowire paper exhibits interesting properties: reversible wettability, oleophilic while being hydrophobic, and high thermal stability. These ...

Soo, Haw Yun

2007-01-01T23:59:59.000Z

75

Uranyl nitrate-exposed rat alveolar macrophages cell death: Influence of superoxide anion and TNF ? mediators  

SciTech Connect (OSTI)

Uranium compounds are widely used in the nuclear fuel cycle, military and many other diverse industrial processes. Health risks associated with uranium exposure include nephrotoxicity, cancer, respiratory, and immune disorders. Macrophages present in body tissues are the main cell type involved in the internalization of uranium particles. To better understand the pathological effects associated with depleted uranium (DU) inhalation, we examined the metabolic activity, phagocytosis, genotoxicity and inflammation on DU-exposed rat alveolar macrophages (12.5–200 ?M). Stability and dissolution of DU could differ depending on the dissolvent and in turn alter its biological action. We dissolved DU in sodium bicarbonate (NaHCO{sub 3} 100 mM) and in what we consider a more physiological vehicle resembling human internal media: sodium chloride (NaCl 0.9%). We demonstrate that uranyl nitrate in NaCl solubilizes, enters the cell, and elicits its cytotoxic effect similarly to when it is diluted in NaHCO{sub 3}. We show that irrespective of the dissolvent employed, uranyl nitrate impairs cell metabolism, and at low doses induces both phagocytosis and generation of superoxide anion (O{sub 2}{sup ?}). At high doses it provokes the secretion of TNF? and through all the range of doses tested, apoptosis. We herein suggest that at DU low doses O{sub 2}{sup ?} may act as the principal mediator of DNA damage while at higher doses the signaling pathway mediated by O{sub 2}{sup ?} may be blocked, prevailing damage to DNA by the TNF? route. The study of macrophage functions after uranyl nitrate treatment could provide insights into the pathophysiology of uranium?related diseases. -- Highlights: ? Uranyl nitrate effect on cultured macrophages is linked to the doses and independent of its solubility. ? At low doses uranyl nitrate induces generation of superoxide anion. ? At high doses uranyl nitrate provokes secretion of TNF?. ? Uranyl nitrate induces apoptosis through all the range of doses tested.

Orona, N.S. [School of Science and Technology, National University of General Martín, Avda Gral Paz 5445 (1650) San Martín, Buenos Aires (Argentina)] [School of Science and Technology, National University of General Martín, Avda Gral Paz 5445 (1650) San Martín, Buenos Aires (Argentina); Tasat, D.R., E-mail: deborah.tasat@unsam.edu.ar [School of Science and Technology, National University of General Martín, Avda Gral Paz 5445 (1650) San Martín, Buenos Aires (Argentina); School of Dentistry, University of Buenos Aires, M. T. de Alvear 2142 (1122), Buenos Aires (Argentina)

2012-06-15T23:59:59.000Z

76

Effect of xenobiotics on the respiratory activity of rat heart mitochondria and the concomitant formation of superoxide radicals  

SciTech Connect (OSTI)

The effects of the xenobiotics atrazine, benzene, butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), lindane, toluene, and xylenol on the respiration of isolated rate heart mitochondria were studied. Bioenergetic parameters such as respiratory control (RC) and ATP/oxygen (P/O) values decreased considerably in the presence of these substances, and a concomitant increase of superoxide radical (O[sub 2][sup [minus

Stolze, K.; Nohl, H. (Univ. of Vienna (Austria). Inst. of Pharmacology and Toxicology)

1994-03-01T23:59:59.000Z

77

Adsorption and decomposition of triclosan by activated carbons, manganese oxides, and their composite materials from aqueous solution.  

E-Print Network [OSTI]

??This research investigates the use of activated carbon (AC) and manganese oxides as adsorbents and oxidizing agents to adsorb and oxidize triclosan, a compound which… (more)

Fang, Sheng

2010-01-01T23:59:59.000Z

78

Production and field performance of transgenic alfalfa (Medicago sativa L.) expressing alpha-amylase and manganese-dependent lignin peroxidase  

Science Journals Connector (OSTI)

Transgenic alfalfa plants expressing Bacillus licheniformis alpha-amylase and manganese-dependent lignin peroxidase (Mn-P...Phanerochaete chrysosporium were produced using the Agrobacterium tumefaciens...transfor...

S. Austin; E. T. Bingham; D. E. Mathews…

1995-01-01T23:59:59.000Z

79

Muon Spin Relaxation Study of Spinel Lithium Manganese Oxides  

Science Journals Connector (OSTI)

Muons can be implanted into any material, and the direction of the muon spin at the instant of decay (?+ ? e+ + ?e + ???, lifetime = 2.179 ?s) provides information on the dynamics of the muon during its lifetime and on the static and fluctuating magnetic fields from neighboring nuclear and atomic moments. ... On the other hand, the shape of the H+-MnO2 spectrum at 100 K shows two Gaussian components, which indicates the existence of at least two different depolarization rates that can be due to muons at two different muon sites. ... Therefore, these results indicate that the temperature for onset of Li+ ion diffusion decreases with an increase in the amount of lithium in the spinel manganese oxide, which is not incompatible with a higher Li+ diffusion coefficient on LiMn2O4 than on Li1.33Mn1.67O4 found from NMR experiments,21 since NMR data will average over all Li nuclei whereas muons only interact with those Li nearest to the muon. ...

María J. Ariza; Deborah J. Jones; Jacques Rozière; James S. Lord; Didier Ravot

2003-05-28T23:59:59.000Z

80

Hydrothermal Synthesis of Pure r-Phase Manganese(II) Sulfide without the Use of Organic Reagents  

E-Print Network [OSTI]

Articles Hydrothermal Synthesis of Pure r-Phase Manganese(II) Sulfide without the Use of Organic for finding carbon-free synthesis methods for metal sulfides. The decomposition of organosulfur, such as manganese sulfide (MnS). Here we report a hydrothermal synthesis method for the formation of MnS in which

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

ENVR Dionysios Dionysiou Wednesday, August 22, 2012 261 -Arsenic mobilization in the critical zone: Oxidation by manganese oxide minerals  

E-Print Network [OSTI]

Research, University of Delaware, Newark, DE 19716, United States, (2) Engineer Research & Development Center, U.S. Army Corps of Engineers, Vicksburg, MS 39180, United States Manganese(IV) oxides are one of the main redox catalysts in the subsurface environment. Their highly reactive surfaces allow manganese (Mn

Sparks, Donald L.

82

The connection between the damping capacity and the crystal structure of some copper-manganese alloys  

E-Print Network [OSTI]

THE CONNECTION BETHEEN THE DANPIING CAPACIITY AND THE CRYSTAL STRUCTURE OF SOME COPPER-MANGANESE ALLOYS A Thesis By Leon Eldon McCrary Submitted to the Graduate School of the Agricultural and Mechanlcai College of Texas ln partial fulfil... lment of the requirements for the degree of MASTER OF SCIIENCE August 'l960 Major Sub)ect: Physics THE CONNECTION BETWEEN THE DAMPING CAPACITY AND THE CRYSTAL STRUCTURE OF SOME COPPER-MANGANESE ALLOYS A Thesis By Leon E I don McC ra ry Approved...

McCrary, Leon Eldon

1960-01-01T23:59:59.000Z

83

Manganese oxide helices, rings, strands, and films, and methods for their preparation  

DOE Patents [OSTI]

Methods for the preparation of mixed-valence manganese oxide compositions with quaternary ammonium ions are described. The compositions self-assemble into helices, rings, and strands without any imposed concentration gradient. These helices, rings, and strands, as well as films having the same composition, undergo rapid ion exchange to replace the quaternary ammonium ions with various metal ions. And the metal-ion-containing manganese oxide compositions so formed can be heat treated to form semi-conducting materials with high surface areas.

Suib, Steven L. (Storrs, CT); Giraldo, Oscar (Storrs, CT); Marquez, Manuel (Wheeling, IL); Brock, Stephanie (Detroit, MI)

2003-01-07T23:59:59.000Z

84

NFkB in the Thiol-Induced Adaptive Response (A)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

A) A) David Grdina The University of Chicago Abstract Exposure of cells to low non-lethal doses of ionizing radiation (≤ 10 cGy) or WR1065, the active free thiol form of amifostine, can induce pro-survival pathways that result in protection against the damaging effects of a 2 Gy dose of ionizing radiation. One such signaling pathway involves the activation of NFκB and the subsequent elevation of active manganese superoxide dismutase (SOD2). SOD2 is a mitochondrial matrix protein that serves as the primary mitochondrial defense against superoxide formation. Its primary function is to facilitate the dismutation of two molecules of superoxide anion (O2-) produced by normal respiratory processes or following exposure to ionizing radiation into water and hydrogen peroxide. To characterize the role of SOD2 in the radiation- and

85

The effect of paramagnetic manganese cations on 1 H MR spectroscopy of the brain  

E-Print Network [OSTI]

The effect of paramagnetic manganese cations on 1 H MR spectroscopy of the brain K. S. Madsen1 has investigated the effect of Mn on 1 H MR spectroscopy using an in vivo Mn-enhanced optic tract into a stereotactic device. Images and 1 H MR spectra were acquired using a Varian 4.7T animal scanner together

86

Reverse Transcription-PCR Analysis of the Regulation of the Manganese Peroxidase Gene Family  

Science Journals Connector (OSTI)

...also contain putative heat shock elements...of polycyclic aromatic hydrocarbon-contaminated soil with...Alic M. Gold M. H. Heat shock induction of manganese...Farrell R. L. Enzymatic combustion: the microbial degradation...enzyme, as well as by heat shock and other factors...

Jessica M. Gettemy; Biao Ma; Margaret Alic; Michael H. Gold

1998-02-01T23:59:59.000Z

87

Carbon Nanotube/Manganese Oxide Ultrathin Film Electrodes for Electrochemical Capacitors  

Science Journals Connector (OSTI)

Multiwall carbon nanotube (MWNT)/manganese oxide (MnO2) nanocomposite ultrathin film electrodes have been created via redox deposition of MnO2 on layer-by-layer (LbL)-assembled MWNT films. We demonstrate that these LbL-assembled MWNT (LbL-MWNT)/MnO2 thin ...

Seung Woo Lee; Junhyung Kim; Shuo Chen; Paula T. Hammond; Yang Shao-Horn

2010-06-16T23:59:59.000Z

88

Rare earth element sorption onto hydrous manganese oxide A modeling study  

E-Print Network [OSTI]

element sorption onto hydrous manganese oxide A modeling study Olivier Pourret1* and Mélanie Davranche2 1 models due to the lack of a comprehensive set of sorption reactions consistent with a given surface complexation model (SCM), as well as discrepancies between published sorption data and predictions using

Paris-Sud XI, Université de

89

X-ray Fluorescence Measurements of Manganese in Petroglyphs and Graffiti in the Bluff, Utah Area  

E-Print Network [OSTI]

X-ray Fluorescence Measurements of Manganese in Petroglyphs and Graffiti in the Bluff, Utah Area the age of rock art using Mn levels, Lytle (2008). In this work we use x-ray fluorescence (XRF) to measure of methods including atomic mass spectroscopy (AMS) measurements of 14 C, Particle-induced X-ray Excitation

90

Amperometric Biosensors Based on Carbon Paste Electrodes Modified with Nanostructured Mixed-valence Manganese Oxides and Glucose Oxidase  

SciTech Connect (OSTI)

Nanostructured multivalent manganese oxides octahedral molecular sieve (OMS), including cryptomelane-type manganese oxides and todorokite-type manganese oxides, were synthesized and evaluated for chemical sensing and biosensing at low operating potential. Both cryptomelane-type manganese oxides and todorokite-type manganese oxides are nanofibrous crystals with sub-nanometer open tunnels that provide a unique property for sensing applications. The electrochemical and electrocatalytic performance of OMS for the oxidation of H2O2 have been compared. Both cryptomelane-type manganese oxides and todorokite-type manganese oxides can be used to fabricate sensitive H2O2 sensors. Amperometric glucose biosensors are constructed by bulk modification of carbon paste electrodes (CPEs) with glucose oxidase as a biocomponent and nanostructured OMS as a mediator. A Nafion thin film was applied as an immobilization/encapsulation and protective layer. The biosensors were evaluated as an amperometric glucose detector at phosphate buffer solution with a pH 7.4 at an operating potential of 0.3 V (vs. Ag/AgCl). The biosensor is characterized by a well-reproducible amperometric response, linear signal-to-glucose concentration range up to 3.5 mM and 1.75 mM, and detection limits (S/N = 3) of 0.1 mM and 0.05 mM for todorokite-type manganese oxide and cryptomelane-type manganese oxide modified electrodes, respectively. The biosensors based on OMS exhibit considerable good reproducibility and stability, and the construction and renewal are simple and inexpensive.

Cui, Xiaoli; Liu, Guodong; Lin, Yuehe

2005-06-01T23:59:59.000Z

91

A Parkinsonian Syndrome in Methcathinone Users and the Role of Manganese  

Science Journals Connector (OSTI)

...antibodies, CD4 lymphocyte counts, and liver function. In addition, serum ceruloplasmin and copper levels were measured. MRI was performed with a General Electric 1.0T Signa Horizon LX high-speed system with head coil and a standardized magnetic resonance examination protocol; sagittal, axial, and coronal T1... In this case series of 23 adults in Latvia who were injection users of methcathinone (a drug manufactured by users from readily available pharmaceutical agents such as pseudoephedrine), patients had an extrapyramidal syndrome, elevated serum manganese levels, and MRI abnormalities in the basal ganglia. These findings suggest that methcathinone use can result in neurologic toxic effects from manganese contained in the methcathinone solution.

Stepens A.; Logina I.; Liguts V.

2008-03-06T23:59:59.000Z

92

Study by IR-spectroscopy and adsorption of platinum-alumina catalysts modified by manganese  

SciTech Connect (OSTI)

Additions of Re are widely employed for modifying platinum-alumina catalysts (PAC). The effect of Mn on the catalysis of and the physicochemical properties of PAC has been less studied. It is only known that adding <0.2 wt. % Mn has no effect on the dispersity of the Pt crystallites. In this work the authors have studied the state of Pt in unmodified PAC by IR spectroscopy of adsorbed CO and by the adsorption of H/sub 2/ at elevated temperatures. The state of the metallic platinum in platinum-alumina catalysts modified by Mn is more heterogeneous than in the unmodified sample. When manganese is added, platinum crystallites with stronger electron-donor properties form on the surface of the catalyst. In platinum-alumina catalysts modified by manganese, there is an increase in the number of sites for the high-temperature dissociative adsorption of hydrogen located on the surface of the Mn-modified carrier.

Zaitsev, A.V.; Barkova, A.P.; Borovkov, B.Yu.; Sterligov, O.D.; Isagulyants, G.V.; Kazanskii, V.B.

1987-03-10T23:59:59.000Z

93

ENERGY LEVELS AND SPECTRAL LINES OF SINGLY IONIZED MANGANESE (Mn II)  

SciTech Connect (OSTI)

This compilation revises the previously recommended list of energy levels of singly ionized manganese (Mn II) and provides a comprehensive list of observed spectral lines and transition probabilities in this spectrum. The new level optimization takes into account critically assessed uncertainties of measured wavelengths and includes about a hundred high-precision wavelengths determined by laser spectroscopy and Fourier transform techniques. Uncertainties of 63% of energy levels and 74% of Ritz wavelengths are reduced by a factor of three on average.

Kramida, Alexander; Sansonetti, Jean E. [National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States)] [National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States)

2013-04-01T23:59:59.000Z

94

Investigation of different manganese ores as oxygen carriers in chemical-looping combustion (CLC) for solid fuels  

Science Journals Connector (OSTI)

Abstract The chemical-looping combustion (CLC) process is a novel solution for efficient combustion with direct capture of carbon dioxide. The process uses a metal oxide as an oxygen carrier to transfer oxygen from an air to a fuel reactor, where the fuel reacts with the solid oxygen carrier. In this work, six different manganese ores are investigated as oxygen carriers for CLC application. The chemical-looping characteristics of the oxygen carriers were evaluated in a laboratory-scale fluidized-bed reactor in the temperature range of 900–970 °C during alternating reducing and oxidizing conditions. Three of the manganese ores showed a small oxygen release in inert environment between 850 and 950 °C. During reactivity tests, the gas yield with methane increased with the temperature and complete conversion of 50% CO in H2 was obtained for all of the ores. The rates of char gasification of two fuels, namely Mexican petroleum coke and Swedish wood char, were compared for the different manganese ores at 970 °C and with 50% H2O in N2 as fluidizing gas. Ilmenite and a manufactured Mn-oxide oxygen carrier consisting of Mn3O4 and MgO-stabilized ZrO2 as support were also included for comparison. The char gasification rate and the gas conversion were higher with the manganese ores and the Mn-oxide oxygen carrier compared to ilmenite. However, the higher reactivity of the manganese ores with H2 and the ensuing decrease in H2 inhibition for manganese ores is not sufficient to explain their higher rate of char gasification. Surface analysis of partially gasified petcoke particles in the presence of manganese ores showed formation of cavities and channels as well as a uniform distribution of potassium and sodium elements. The rate of char gasification also increased with the concentration of potassium and sodium impurities in the manganese ores. Thus the results suggest that the increased rate of char conversion for manganese ores is due to alkali-catalyzed steam gasification. The increase in rate of char gasification, in combination with potentially low costs of these materials suggests that manganese ores could be interesting materials for CLC with solid fuels.

Mehdi Arjmand; Henrik Leion; Tobias Mattisson; Anders Lyngfelt

2014-01-01T23:59:59.000Z

95

Hot coal gas desulfurization with manganese-based sorbents. Final report, September 1992--December 1994  

SciTech Connect (OSTI)

The focus of much current work being performed by the Morgantown Energy Technology Center (METC) of the Department of Energy on hot coal-derived fuel gas desulfurization is in the use of zinc-based sorbents. METC has shown interest in formulating and testing manganese-based pellets as alternative effective sulfur sorbents in the 700 to 1200{degree}C temperature range. To substantiate the potential superiority of Mn-based pellets, a systematic approach toward the evaluation of the desulfurizing power of single-metal sorbents is developed based on thermodynamic considerations. This novel procedure considered several metal-based sorbents and singled out manganese oxide as a prime candidate sorbent capable of being utilized under a wide temperature range, irrespective of the reducing power (determined by CO{sub 2}/CO ratio) of the fuel gas. Then, the thermodynamic feasibility of using Mn-based pellets for the removal of H{sub 2}S from hot-coal derived fuel gases, and the subsequent oxidative regeneration of loaded (sulfided) pellets was established. It was concluded that MnO is the stable form of manganese for virtually all commercially available coal-derived fuel gases. In addition, the objective of reducing the H{sub 2}S concentration below 150 ppMv to satisfy the integrated gasification combined cycle system requirement was shown to be thermodynamically feasible. A novel process is developed for the manufacture of Mn-based spherical pellets which have the desired physical and chemical characteristics required.

Hepworth, M.T.; Slimane, R.B.

1994-11-01T23:59:59.000Z

96

Demonstration of the 101st harmonic generated from a laser-produced manganese plasma  

SciTech Connect (OSTI)

We demonstrate the generation of the 101st harmonic (wavelength {lambda}=7.9 nm) from manganese plasma, which is generated using the plasma high-order harmonic technique. We also investigate the variation of the high-order harmonic distribution from the manganese plasma plume as a function of the prepulse and main pulse intensities. The harmonic cutoff was at the 31st order, for pump intensities below the barrier suppression intensity for singly charged Mn ions. However, by using higher prepulse and main pulse intensities, the harmonic cutoff was extended to the 101st order, with an appearance of second plateau for harmonics higher than the 31st order. In this case, the low-order harmonics decreased in intensity, or completely disappeared, and the spectrum for wavelengths longer than 27.6 nm was dominated by plasma line emission. The origin of the harmonics appearing at this short wavelength plateau is attributed to the interaction of the intense main pump laser field with doubly charged manganese ions.

Ganeev, R. A. [Institut National de la Recherche Scientifique, Centre Energie, Materiaux et Telecommunications, 1650 Lionel-Boulet, Varennes, Quebec, J3X 1S2 (Canada); Scientific Association Akadempribor, Academy of Sciences of Uzbekistan, Akademgorodok, Tashkent 100125 (Uzbekistan); Bom, L. B. Elouga; Kieffer, J.-C.; Ozaki, T. [Institut National de la Recherche Scientifique, Centre Energie, Materiaux et Telecommunications, 1650 Lionel-Boulet, Varennes, Quebec, J3X 1S2 (Canada); Suzuki, M.; Kuroda, H. [Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581 (Japan)

2007-08-15T23:59:59.000Z

97

Secondary cell with orthorhombic alkali metal/manganese oxide phase active cathode material  

DOE Patents [OSTI]

An alkali metal manganese oxide secondary cell is disclosed which can provide a high rate of discharge, good cycling capabilities, good stability of the cathode material, high specific energy (energy per unit of weight) and high energy density (energy per unit volume). The active material in the anode is an alkali metal and the active material in the cathode comprises an orthorhombic alkali metal manganese oxide which undergoes intercalation and deintercalation without a change in phase, resulting in a substantially linear change in voltage with change in the state of charge of the cell. The active material in the cathode is an orthorhombic structure having the formula M.sub.x Z.sub.y Mn.sub.(1-y) O.sub.2, where M is an alkali metal; Z is a metal capable of substituting for manganese in the orthorhombic structure such as iron, cobalt or titanium; x ranges from about 0.2 in the fully charged state to about 0.75 in the fully discharged state, and y ranges from 0 to 60 atomic %. Preferably, the cell is constructed with a solid electrolyte, but a liquid or gelatinous electrolyte may also be used in the cell.

Doeff, Marca M. (Hayward, CA); Peng, Marcus Y. (Cupertino, CA); Ma, Yanping (Albany, CA); Visco, Steven J. (Berkeley, CA); DeJonghe, Lutgard C. (Lafayette, CA)

1996-01-01T23:59:59.000Z

98

Use of manganese ore in chemical-looping combustion (CLC)—Effect on steam gasification  

Science Journals Connector (OSTI)

The chemical-looping combustion (CLC) process is a novel solution for efficient combustion with direct separation of carbon dioxide. The process uses a metal oxide as an oxygen carrier to transfer oxygen from an air to a fuel reactor, where the fuel reacts with the solid oxygen carrier. When solid fuel is used in CLC, the char needs to be gasified by e.g. steam to form H2 and CO that can be subsequently oxidized to H2O and CO2 by the oxygen carrier. In this work, the influence of the oxygen carrier on the rate of steam gasification is studied, by comparing the conversion of petcoke in the presence of manganese ore to that of ilmenite. The experiments were carried out in a fluidized-bed reactor at 970 °C using a fluidization gas of 50% steam in nitrogen. The manganese ore shows an increase by a factor five in the rate of steam gasification of char as compared to ilmenite. The dramatic increase in rate of steam gasification, in combination with potentially low costs of this material suggests that manganese ore could be an interesting material for CLC with solid fuels.

Mehdi Arjmand; Henrik Leion; Anders Lyngfelt; Tobias Mattisson

2012-01-01T23:59:59.000Z

99

Secondary cell with orthorhombic alkali metal/manganese oxide phase active cathode material  

DOE Patents [OSTI]

An alkali metal manganese oxide secondary cell is disclosed which can provide a high rate of discharge, good cycling capabilities, good stability of the cathode material, high specific energy (energy per unit of weight) and high energy density (energy per unit volume). The active material in the anode is an alkali metal and the active material in the cathode comprises an orthorhombic alkali metal manganese oxide which undergoes intercalation and deintercalation without a change in phase, resulting in a substantially linear change in voltage with change in the state of charge of the cell. The active material in the cathode is an orthorhombic structure having the formula M{sub x}Z{sub y}Mn{sub (1{minus}y)}O{sub 2}, where M is an alkali metal; Z is a metal capable of substituting for manganese in the orthorhombic structure such as iron, cobalt or titanium; x ranges from about 0.2 in the fully charged state to about 0.75 in the fully discharged state, and y ranges from 0 to 60 atomic %. Preferably, the cell is constructed with a solid electrolyte, but a liquid or gelatinous electrolyte may also be used in the cell. 11 figs.

Doeff, M.M.; Peng, M.Y.; Ma, Y.; Visco, S.J.; DeJonghe, L.C.

1996-09-24T23:59:59.000Z

100

Relationships between chemical forms of soil iron and manganese and their absorption by rice from 34 flooded Gulf Coast soils of Texas  

E-Print Network [OSTI]

GULF COAST SOILS OF TEXAS A Thesis by DOUGLAS P. PHILLIPS Approved as to style and content by: airman of Comnittee ea of Department em er ember Mem er Mem er Mem er December 1971 ABSTRACT Relationships Between Chemical Forms of Soil Iron... of iron (Fe) and manganese (Mn) in 34 Gulf Coast rice soils at 48 days from submergence . . . 44 6 Content of active iron and manganese, exchangeable iron and manganese (48 days from submergence), and water soluble iron and manganese (48 days from...

Phillips, Douglas Patton

1971-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

DAFS study of site-specific local structure of Mn in manganese ferrite films.  

SciTech Connect (OSTI)

Manganese ferrite (MnFe{sub 2}O{sub 4}) is a well-known magnetic material widely used in electronics for many years. It is well established that its magnetic behavior is strongly influenced by local structural properties of Mn ions, which are distributed between crystallographically inequivalent tetrahedral and octahedral sites in the unit cell. In order to understand and be able to tune properties of these structures, it is necessary to have detailed site-specific structural information on the system. Here we report on the application of diffraction-anomalous fine structure (DAFS) spectroscopy to resolve site-specific Mn local structures in manganese ferrite films. The DAFS measurements were done at undulator beamline 4-ID-D of the Advanced Photon Source at Argonne National Laboratory. The DAFS spectra (Fig. 1) were measured at several Bragg reflections in the vicinity of the Mn absorption K-edge, having probed separately contributions from tetrahedrally and octahedrally coordinated Mn sites. The DAFS data analysis done with an iterative Kramers-Kroenig algorithm made it possible to solve separately the local structure around different inequivalent Mn sites in the unit cell. The reliability of the data treatment was checked carefully, and it was showed that the site-specific structural parameters obtained with DAFS allow us to describe fluorescence EXAFS spectrum measured independently. Fig. 2 shows individual site contributions to the imaginary part of the resonant scattering amplitude obtained from the treatment of the data of Fig. 1. The analysis of the refined site-specific absorption spectra was done using EXAFS methods based on theoretical standards. We provided direct evidence for the tetrahedral Mn-O bond distance being increased relative to the corresponding Fe-O distance in bulk manganese ferrites. The first coordination shell number was found to be reduced significantly for Mn atoms at these sites. This finding is consistent with the well-known tendency of Mn to be tetrahedrally coordinated in these compounds.

Kravtsov, E.; Haskel, D.; Cady, A.; Yang, A.; Vittoria, C.; Zuo, X.; Harris, V. G.; X-Ray Science Division; Inst. of Metal Physics; Northeastern Univ.; Nankai Univ.

2006-01-01T23:59:59.000Z

102

Manganese-Aluminum-Based Magnets: Nanocrystalline t-MnAI Permanent Magnets  

SciTech Connect (OSTI)

REACT Project: Dartmouth is developing specialized alloys with magnetic properties superior to the rare earths used in today’s best magnets. EVs and renewable power generators typically use rare earths to turn the axles in their electric motors due to the magnetic strength of these minerals. However, rare earths are difficult and expensive to refine. Dartmouth will swap rare earths for a manganese-aluminum alloy that could demonstrate better performance and cost significantly less. The ultimate goal of this project is to develop an easily scalable process that enables the widespread use of low-cost and abundant materials for the magnets used in EVs and renewable power generators.

None

2012-01-01T23:59:59.000Z

103

Reactivity of biogenic manganese oxide for metal sequestration and photochemistry: Computational solid state physics study  

SciTech Connect (OSTI)

Many microbes, including both bacteria and fungi, produce manganese (Mn) oxides by oxidizing soluble Mn(II) to form insoluble Mn(IV) oxide minerals, a kinetically much faster process than abiotic oxidation. These biogenic Mn oxides drive the Mn cycle, coupling it with diverse biogeochemical cycles and determining the bioavailability of environmental contaminants, mainly through strong adsorption and redox reactions. This mini review introduces recent findings based on quantum mechanical density functional theory that reveal the detailed mechanisms of toxic metal adsorption at Mn oxide surfaces and the remarkable role of Mn vacancies in the photochemistry of these minerals.

Kwon, K.D.; Sposito, G.

2010-02-01T23:59:59.000Z

104

Effect of Manganese Concentration in the Cd1-xMnxTe/CdTe Tandem Structure on Photovoltaic Energy Conversion  

Science Journals Connector (OSTI)

Abstract The photovoltaic electricity is obtained by direct conversion of sunlight into electricity by solar cells. The objective of this work is the study and simulation of a Tandem photovoltaic structure based on Cd1-xMnxTe as top material cell. This paper describes the optimization of energy efficiency for Cd1-xMnxTe thin films deposited by epitaxy on CdTe substrat. We present the impact of the manganese concentration in Cd1-xMnxTe thin films on solar cells performances. Our study includes simulation results to show the conversion efficiency and main performances factors as function of the manganese concentration.

A. Aissat; M. El Bey; M. Fathi; J.P. Vilcot

2013-01-01T23:59:59.000Z

105

Electron Paramagnetic Resonance Stopped-Flow Kinetic Study of Manganese(II) Sorption--Desorption on Birnessite  

E-Print Network [OSTI]

Electron Paramagnetic Resonance Stopped-Flow Kinetic Study of Manganese(II) Sorption- nique is demonstrated by investigating the sorption of Mn2+ on S- MnOj. The sorption reaction+ was observed. Measurement of the initial reaction rate al- lowed the forward (sorption) rate constant

Sparks, Donald L.

106

Recovery of manganese oxides from spent alkaline and zinc–carbon batteries. An application as catalysts for VOCs elimination  

SciTech Connect (OSTI)

Highlights: • Manganese oxides were synthesized using spent batteries as raw materials. • Spent alkaline and zinc–carbon size AA batteries were used. • A biohydrometallurgical process was employed to bio-lixiviate batteries. • Manganese oxides were active in the oxidation of VOCs (ethanol and heptane). - Abstract: Manganese, in the form of oxide, was recovered from spent alkaline and zinc–carbon batteries employing a biohydrometallurgy process, using a pilot plant consisting in: an air-lift bioreactor (containing an acid-reducing medium produced by an Acidithiobacillus thiooxidans bacteria immobilized on elemental sulfur); a leaching reactor (were battery powder is mixed with the acid-reducing medium) and a recovery reactor. Two different manganese oxides were recovered from the leachate liquor: one of them by electrolysis (EMO) and the other by a chemical precipitation with KMnO{sub 4} solution (CMO). The non-leached solid residue was also studied (RMO). The solids were compared with a MnO{sub x} synthesized in our laboratory. The characterization by XRD, FTIR and XPS reveal the presence of Mn{sub 2}O{sub 3} in the EMO and the CMO samples, together with some Mn{sup 4+} cations. In the solid not extracted by acidic leaching (RMO) the main phase detected was Mn{sub 3}O{sub 4}. The catalytic performance of the oxides was studied in the complete oxidation of ethanol and heptane. Complete conversion of ethanol occurs at 200 °C, while heptane requires more than 400 °C. The CMO has the highest oxide selectivity to CO{sub 2}. The results show that manganese oxides obtained using spent alkaline and zinc–carbon batteries as raw materials, have an interesting performance as catalysts for elimination of VOCs.

Gallegos, María V., E-mail: plapimu@yahoo.com.ar [Pla.Pi.Mu-Planta Piloto Multipropósito, (CICPBA-UNLP) Cno. Centenario y 505, M.B. Gonnet, Buenos Aires (Argentina); Falco, Lorena R., E-mail: mlfalco@quimica.unlp.edu.ar [Pla.Pi.Mu-Planta Piloto Multipropósito, (CICPBA-UNLP) Cno. Centenario y 505, M.B. Gonnet, Buenos Aires (Argentina); Peluso, Miguel A., E-mail: apelu@quimica.unlp.edu.ar [Centro de Investigación y Desarrollo en Ciencias Aplicadas, “Dr. J. Ronco” CINDECA (CONICET CCT La Plata), 47 N°257, La Plata, Buenos Aires (Argentina); Sambeth, Jorge E., E-mail: sambeth@quimica.unlp.edu.ar [Centro de Investigación y Desarrollo en Ciencias Aplicadas, “Dr. J. Ronco” CINDECA (CONICET CCT La Plata), 47 N°257, La Plata, Buenos Aires (Argentina); Thomas, Horacio J. [Pla.Pi.Mu-Planta Piloto Multipropósito, (CICPBA-UNLP) Cno. Centenario y 505, M.B. Gonnet, Buenos Aires (Argentina)

2013-06-15T23:59:59.000Z

107

Sorption of Ferric Iron from Siderophore Complexes by Layer Type Manganese  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sorption of Ferric Iron from Siderophore Complexes by Layer Type Sorption of Ferric Iron from Siderophore Complexes by Layer Type Manganese Oxides Owen W. Duckworth (North Carolina State University), John R. Bargar (Stanford Synchrotron Radiation Lightsource), and Garrison Sposito (University of California-Berkeley) figure 1 Figure 1. Top: Iron is thought to limit phytoplankton in much of the world's oceans. Bottom: Structure of the iron-siderophore complex ferrioxamine B [Fe(III)HDFOB+]. Image courtesy of Andrzej Jarzecki, Brooklyn College, the City University of New York. Iron is one of several essential nutrients thought to limit phytoplankton growth in large areas of the world's oceans. The growth of marine phytoplankton represents a important linkage in the carbon cycle, accounting for approximately 50% of the total biological uptake of carbon

108

3-D Atomic-Scale Mapping of Manganese Dopants in Lead Sulfide Nanowires  

SciTech Connect (OSTI)

Dopants in nanowires, whether intentional or unintentional, can ultimately control the material's properties and therefore need to be understood on the atomic scale. We study vapor-liquid-solid grown manganese-doped lead sulfide nanowires by atom-probe tomography for the first time for lead salt materials. The three-dimensional chemical concentration maps at the atomic scale demonstrate a radial distribution profile of Mn ions, with a concentration of only 0.18 at.% and 0.01 at.% for MnCl2 and Mn-acetate precursors, respectively. The ability to characterize these small concentrations of dopant atoms in Pb1-xMnxS nanowires (x = 0.0036 and 0.0002), important for spintronic and thermoelectric devices, sets a platform for similar analyses for all nanostructures. First-principles calculations confirm that Mn atoms substitute for Pb in the PbS structure.

Isheim, Dieter; Kaszpurenko, Jason; Yu, Dong; Mao, Zugang; Seidman, David N.; Arslan, Ilke

2012-03-22T23:59:59.000Z

109

Hole dispersions in the G- and C-type orbital ordering backgrounds: Doped manganese oxides  

Science Journals Connector (OSTI)

In the framework of the linear spin-wave theory and orbital-charge separation, we calculate quasiparticle (QP) dispersions for two different antiferromagnetic orbital structures in the fully saturated spin phase of manganese oxides. Although with the same orbital wave excitations, the QP bands of C- and G-type orbital structures exhibit completely different shapes. The pseudogap observed in the density of states and spectral functions around ?=0 is related with the large antiferromagnetic orbital fluctuation. The minimal band energy for G-type is lower than that for C-type orbital order, while these band curves almost coincide in some momentum points. Larger energy splitting occurs between the two branches of kz=0 and kz=? when increasing the superexchange coupling J, suggesting that the orbital scattering plays an essential role in the QP dispersions.

Xiao-Juan Fan; Shun-Qing Shen; Z. D. Wang; X.-G. Li; Qiang-Hua Wang

2000-08-01T23:59:59.000Z

110

Electronic structure and magnetic properties of the perovskite cerium manganese oxide from ab initio calculations  

Science Journals Connector (OSTI)

Abstract We have performed first-principle calculations of the structural, electronic and magnetic properties of cerium manganese oxide (CeMnO)3, using full-potential linearized augmented plane-wave (FP-LAPW) scheme within GGA and GGA+U approaches. Features such as the lattice constant, bulk modulus and its pressure derivative are reported. Also, we have presented our results of the band structure and the density of states. The results show a half-metallic ferromagnetic ground state for CeMnO3 in GGA+U treatment, whereas semi-metallic ferromagnetic character is observed in GGA. The results obtained, make the cubic CeMnO3 a candidate material for future spintronic application.

Saadi Berri; Djamel Maouche; Miloud Ibrir; Badis Bakri

2014-01-01T23:59:59.000Z

111

The Absorption Spectrum of Manganese Vapor in the Visible and Ultraviolet  

Science Journals Connector (OSTI)

With an absorbing column of the vapor about 3 cm long heated to temperatures between 1200°C and 1600°C, absorption was observed at 31 lines. Grotrian had previously reported absorption at 6 of these lines. All of the absorptions are from manganese atoms in the normal state (1s6 term) and occur in groups of 1, 2 and 3 lines. Five absorption lines represent 1s6-d?6 combinations for which the rule of inner quantum numbers is obeyed but the azimuthal quantum number changes by 2. Four lines are 1s6-p8 combinations and twelve are 1s6-p6 combinations. Some of the remainder are perhaps 1s6-p4 and 1s6-p2 combinations.

R. V. Zumstein

1925-12-01T23:59:59.000Z

112

Elevated manganese and cognitive performance in school-aged children and their mothers  

SciTech Connect (OSTI)

Background: Growing evidence suggests that excess manganese (Mn) in children is associated with neurobehavioral impairments. In Brazil, elevated hair Mn concentrations were reported in children living near a ferro-manganese alloy plant. Objectives: We investigated these children's and caregivers' cognitive function in relation to bioindicators of Mn exposure. Methods: In this cross-sectional study, the WISC-III was administered to 83 children aged between 6 and 12 years; the Raven Progressive Matrix was administered to the primary caregivers (94% mothers), who likewise responded to a questionnaire on socio demographics and birth history. Mn in hair (MnH) and blood (MnB) and blood lead (PbB) were measured by graphite furnace atomic absorption spectrometry (GFAAS). Results: Children's mean MnB and MnH were 8.2 {mu}g/L (2.7-23.4) and 5.83 {mu}g/g (0.1-86.68), respectively. Mean maternal MnH was 3.50 {mu}g/g (0.10-77.45) and correlated to children's MnH (rho=0.294, p=0.010). Children's MnH was negatively related to Full-Scale Intelligence Quotient (IQ) and Verbal IQ; {beta} coefficients for MnH were -5.78 (95% CI -10.71 to -0.21) and -6.72 (-11.81 to -0.63), adjusted for maternal education and nutritional status. Maternal MnH was negatively associated with performance on the Raven's ({beta}=-2.69, 95% CI -5.43 to 0.05), adjusted for education years, family income and age. Conclusions: These findings confirm that high MnH in children is associated with poorer cognitive performance, especially in the verbal domain. Primary caregiver's IQ is likewise associated to Mn exposure, suggesting that, in this situation, children's cognition may be affected directly and indirectly by Mn exposure.

Menezes-Filho, Jose A., E-mail: antomen@ufba.br [College of Pharmacy, Federal University of Bahia (Brazil); Public and Environmental Health Program, National School of Public Health, Oswaldo Cruz Foundation (Brazil); Novaes, Cristiane de O.; Moreira, Josino C.; Sarcinelli, Paula N. [Public and Environmental Health Program, National School of Public Health, Oswaldo Cruz Foundation (Brazil)] [Public and Environmental Health Program, National School of Public Health, Oswaldo Cruz Foundation (Brazil); Mergler, Donna [Centre de Recherche Interdisciplinaire sur la Biologie, la Sante, la Societe et l'Environnement (CINBIOSE), Universite du Quebec a Montreal (Canada)] [Centre de Recherche Interdisciplinaire sur la Biologie, la Sante, la Societe et l'Environnement (CINBIOSE), Universite du Quebec a Montreal (Canada)

2011-01-15T23:59:59.000Z

113

Low Frequency-SAFT Inspection Methodology for Coarse-Grained Steel Rail Components (Manganese Steel Frogs)  

SciTech Connect (OSTI)

In the rail industry, sections of high strength Manganese steel are employed at critical locations in railroad networks. Ultrasonic inspections of Manganese steel microstructures are difficult to inspect with conventional means, as the propagation medium is highly attenuative, coarse-grained, anisotropic and nonhomogeneous in nature. Current in-service inspection methods are ineffective while pre-service X-ray methods (used for full-volumetric examinations of components prior to shipment) are time-consuming, costly, require special facilities and highly trained personnel for safe operations, and preclude manufacturers from inspecting statistically meaningful numbers of frogs for effective quality assurance. In-service examinations consist of visual inspections only and by the time a defect or flaw is visually detected, the structural integrity of the component may already be compromised, and immediate repair or replacement is required. A novel ultrasonic inspection technique utilizing low frequency ultrasound (100 to 500 kHz) combined with a synthetic aperture focusing technique (SAFT) for effective reduction of signal clutter and noise, and extraction of important features in the data, has proven to be effective for these coarse grained steel components. Results from proof-of-principal tests in the laboratory demonstrate an effective means to detect and localize reflectors introduced as a function of size and depth from the top of the frog rail. Using non-optimal, commercially available transducers coupled with the low-frequency/SAFT approach, preliminary evaluations were conducted to study the effects of the material microstructure on ultrasonic propagation, sensitivity and resolution in thick section frog components with machined side-drilled holes. Results from this study will be presented and discussed.

Diaz, Aaron A.; Andersen, Eric S.; Samuel, Todd J.

2004-11-01T23:59:59.000Z

114

Suppression of manganese-dependent production of nitric oxide in astrocytes: implications for therapeutic modulation of glial-derived inflammatory mediators  

E-Print Network [OSTI]

Primary cultured astrocytes were treated with Mn in the absence and presence of proinflammatory cytokines to determine their effect upon stimulation of nitric oxide (NO) production. Treatments of manganese and cytokines raised NO production...

Wright, Tyler T.

2009-05-15T23:59:59.000Z

115

Pillared smectite modified with carbon and manganese as catalyst for SCR of NOx with NH3. Part I. General characterization and catalyst screening  

Science Journals Connector (OSTI)

Carbon- and manganese-modified zirconia-pillared smectites were prepared, characterized (XRD, BET and pore analysis, XPS) and tested in selective catalytic reduction of NOx with NH3. Both untreated and acidic pre...

Lucjan Chmielarz; Roman Dziembaj; Teresa Grzybek; Jerzy Klinik…

116

The distribution of copper, manganese, zinc, and iron in antarctic waters and the relation of the concentrations of these metals to biological primary productivity  

E-Print Network [OSTI]

THE DISTRIBUTION OF COPPER, MANGANESE, ZINC, AND IRON IN ANTARCTIC WATERS AND THE RELATION OF THE CONCENTRATIONS OF THESE METALS TO BIOLOGICAL PRIMARY PRODUCTIVITY A Thesis By MARTIN EDWARD ARHELGER Submitted to the Graduate College... of the Texas A& 1 University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August I967 Major Subj ect: CHEMICAL OCEANOGRAPHY THE DISTRIBUTION OF COPPER, MANGANESE, ZINC, AND IRON IN ANTARCTIC WATERS AND THE RELATION...

Arhelger, Martin Edward

1967-01-01T23:59:59.000Z

117

This journal is c The Royal Society of Chemistry 2011 Chem. Commun. Cite this: DOI: 10.1039/c1cc12418h  

E-Print Network [OSTI]

, such as superoxide dismutase, the oxygen-evolving center of photo- system II, and catalases.4,5 For these processes

McQuade, D. Tyler

118

Antioxidant effects of reduced water produced by electrolysis of sodium chloride solutions  

Science Journals Connector (OSTI)

Antioxidant vitamins and enzymes such as superoxide dismutase, catalase and glutathione peroxidase are considered to function as scavengers against reactive oxygen species and to provide protection against rea...

K. Hanaoka

2001-12-01T23:59:59.000Z

119

Physiologia Plantarum 129: 342350. 2007 Copyright Physiologia Plantarum 2006, ISSN 0031-9317 Variation in copper tolerance in Arabidopsis thaliana  

E-Print Network [OSTI]

transporters, PAA1 and PAA2. The Fe superoxide dismutase (SOD) gene FSD1 was also downregu- lated in the three

120

Inverse association of intellectual function with very low blood lead but not with manganese exposure in Italian adolescents  

SciTech Connect (OSTI)

Background: Pediatric lead (Pb) exposure impacts cognitive function and behavior and co-exposure to manganese (Mn) may enhance neurotoxicity. Objectives: To assess cognitive and behavioral function in adolescents with environmental exposure to Pb and Mn. Methods: In this cross sectional study, cognitive function and behavior were examined in healthy adolescents with environmental exposure to metals. The Wechsler Intelligence Scale for Children (WISC) and the Conners-Wells' Adolescent Self-Report Scale Long Form (CASS:L) were used to assess cognitive and behavioral function, respectively. ALAD polymorphisms rs1800435 and rs1139488 were measured as potential modifiers. Results: We examined 299 adolescents (49.2% females) aged 11-14 years. Blood lead (BPb) averaged 1.71 {mu}g/dL (median 1.5, range 0.44-10.2), mean Blood Manganese (BMn) was 11.1 {mu}g/dL (median 10.9, range 4.00-24.1). Average total IQ was 106.3 (verbal IQ=102, performance IQ=109.3). According to a multiple regression model considering the effect of other covariates, a reduction of about 2.4 IQ points resulted from a two-fold increase of BPb. The Benchmark Level of BPb associated with a loss of 1 IQ-point (BML01) was 0.19 {mu}g/dL, with a lower 95% confidence limit (BMLL01) of 0.11 {mu}g/dL. A very weak correlation resulted between BPb and the ADHD-like behavior (Kendall's tau rank correlation=0.074, p=0.07). No influence of ALAD genotype was observed on any outcome. Manganese was not associated with cognitive and behavioral outcomes, nor was there any interaction with lead. Conclusions: These findings demonstrate that very low level of lead exposure has a significant negative impact on cognitive function in adolescent children. Being an essential micro-nutrient, manganese may not cause cognitive effects at these low exposure levels.

Lucchini, Roberto G., E-mail: lucchini@med.unibs.it [Department of Preventive Medicine, Mount Sinai School of Medicine, NY (United States); Section of Occupational Medicine, University of Brescia, P.le Spedali Civili 1, 25123 Brescia (Italy); Zoni, Silvia [Section of Occupational Medicine, University of Brescia, P.le Spedali Civili 1, 25123 Brescia (Italy)] [Section of Occupational Medicine, University of Brescia, P.le Spedali Civili 1, 25123 Brescia (Italy); Guazzetti, Stefano [Public Health Service, Reggio Emilia (Italy)] [Public Health Service, Reggio Emilia (Italy); Bontempi, Elza [INSTM and Chemistry for Technologies Laboratory, University of Brescia (Italy)] [INSTM and Chemistry for Technologies Laboratory, University of Brescia (Italy); Micheletti, Serena [Cognition Psychology Neuroscience lab., University of Pavia and Unit of Child Neurology and Psychiatry, Civil Hospital of Brescia (Italy)] [Cognition Psychology Neuroscience lab., University of Pavia and Unit of Child Neurology and Psychiatry, Civil Hospital of Brescia (Italy); Broberg, Karin [Division of Occupational and Environmental Medicine, Lund University (Sweden)] [Division of Occupational and Environmental Medicine, Lund University (Sweden); Parrinello, Giovanni [Statistics and Biometry, University of Brescia (Italy)] [Statistics and Biometry, University of Brescia (Italy); Smith, Donald R. [Microbiology and Environmental Toxicology, University of California at Santa Cruz (United States)] [Microbiology and Environmental Toxicology, University of California at Santa Cruz (United States)

2012-10-15T23:59:59.000Z

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121

Synthesis, structures and properties of a series of manganese coordination complexes constructed from dicarboxylic fluorene derivatives  

SciTech Connect (OSTI)

Assembly reactions of 9,9-diethylfluorene-2,7-dicarboxylic acid (H{sub 2}DFDC) and Mn(CH{sub 3}COO){sub 2}{center_dot}4H{sub 2}O or MnCl{sub 2}{center_dot}4H{sub 2}O by tuning of various secondary ligands such as 2,2 Prime -bipyridine (2,2 Prime -bpy), 4,4 Prime -bipyridine (4,4 Prime -bpy) or 1,3-bis(4-pyridyl)propane) (bpp), gave rise to four complexes {l_brace} [Mn{sub 2}(DFDC){sub 2}(DMF){sub 2}]{center_dot}H{sub 2}O{r_brace} {sub n} (1), [Mn(DFDC)(2,2 Prime -bpy)]{sub n} (2), {l_brace} [Mn{sub 2}(DFDC){sub 2}(4,4 Prime -bpy){sub 2}]{center_dot}2CH{sub 3}OH{r_brace} {sub n} (3), and {l_brace} [Mn{sub 4}(DFDC){sub 4}(bpp){sub 2}(CH{sub 3}OH){sub 3} (H{sub 2}O){sub 3}]{center_dot}3(CH{sub 3}OH){center_dot}3(H{sub 2}O){r_brace} {sub n} (4). Single crystal X-ray diffraction analysis reveal that complex 1 is three dimensional structure with rhombic channels filled by guest water molecules; 2 presents a close-packed structure with high thermal stability; 3 exhibits a three dimensional framework with micro-porous channels filled by guest methanol molecules and 4 is a two-dimensional structure. The photoluminescent properties of 1-4 have been studied, respectively, showing that the Mn(II) ions, accessorial organic ligands or crystal structures exert important influences on the photoluminescence emissions of H{sub 2}DFDC ligands. Thermogravimetric analysis show that the complexes have remarkably high thermal stability. Magnetic susceptibility measurements have been finished and discussed for the complexes. - Graphical abstract: Assembly of 9,9-diethylfluorene-2,7-dicarboxylic acid and Mn(II) salts by tuning of various accessorial ligands resulted in four manganese complexes with different topological frameworks. Highlights: Black-Right-Pointing-Pointer Four manganese complexes based on 9,9-diethylfluorene-2,7-dicarboxylic acid were obtained. Black-Right-Pointing-Pointer The complexes were structurally characterized by single-crystal X-ray diffraction. Black-Right-Pointing-Pointer The complexes 1-4 display different topological structures. Black-Right-Pointing-Pointer Thermogravimetric analysis show the complexes have remarkably high thermal stability.

Li Xing, E-mail: lixing@nbu.edu.cn [State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211 (China); Zhao Xiuhua; Bing Yue; Zha Meiqin; Xie Hongzhen; Guo Zhiyong [State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211 (China)

2013-01-15T23:59:59.000Z

122

Manganese valence and coordination structure in Mn,Mg-codoped {gamma}-AlON green phosphor  

SciTech Connect (OSTI)

The valence and coordination structure of manganese in a Mn,Mg-codoped {gamma}-AlON spinel-type oxynitride green phosphor were studied by synchrotron X-ray diffraction and absorption fine structure measurements. The absorption edge position of the XANES revealed the bivalency of Mn. Two cation sites are available in the spinel structure for cation doping: a tetrahedral site and an octahedral site. The pre-edge of the XANES and the distance to the nearest neighbor atoms obtained from the EXAFS measurement showed that Mn was situated at the tetrahedral site. Rietveld analysis showed that the vacancy occupied the octahedral site. The preferential occupation of the tetrahedral site by Mn and the roles of N and Mg are discussed in relation to the spinel crystal structure. - Graphical Abstract: Fourier transform of EXAFS of Mn K-edge for Mn,Mg-codoped green phosphor and Mn coordination structure. Highlights: Black-Right-Pointing-Pointer Mn, Mg-codoped {gamma}-AlON green phosphor for white LED. Black-Right-Pointing-Pointer The valence of Mn is divalent. Black-Right-Pointing-Pointer Mn occupies the tetrahedral site in the spinel structure.

Takeda, Takashi, E-mail: TAKEDA.Takashi@nims.go.jp [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)] [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Xie, Rong-Jun; Hirosaki, Naoto [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)] [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Matsushita, Yoshitaka [National Institute for Materials Science (NIMS), NIMS-SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)] [National Institute for Materials Science (NIMS), NIMS-SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan); Honma, Tetuso [Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)] [Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)

2012-10-15T23:59:59.000Z

123

Atmospheric chemistry of methylcyclopentadienyl manganese tricarbonyl: Photolysis, reaction with hydroxyl radicals and ozone  

SciTech Connect (OSTI)

The atmospheric fate of MMT has been studied using laboratory smog chamber systems. MMT absorbs strongly in the UV-visible region from 210 to 400 nm with {sigma} (333 nm) = (1.9 {+-} 0.2) x 10{sup {minus}18} cm{sub 2} molecule{sup {minus}1} and undergoes photolysis at a rate estimated to be (1.3 {+-} 0.1) x 10{sup {minus}2} x{sup {minus}1} for a typical summer day at a latitude of 40{degree}N. Photolysis gives CO in a molar yield that is indistinguishable from 100% and an unidentified species believed to be methylcyclopentadienyl manganese dicarbonyl (MMD), which also undergoes rapid photolysis liberating additional CO. Reaction of MMT with OH and O{sub 3} proceeds rapidly with rate constants of k{sub OH} = (1.1 {+-} 0.3) x 10{sup {minus}10} and k{sub 0{sub 3}} = (7.7 {+-} 1.9) x 10{sup {minus}18} cm{sub 3} molecule{sup {minus}1} s{sup {minus}1}. During the day, the atmospheric loss of MMT proceeds essentially entirely via photolysis. At night reaction with O{sub 3} can be significant.

Wallington, T.J.; Sokolov, O.; Hurley, M.D.; Tyndall, G.S.; Orlando, J.J.; Barnes, I.; Becker, K.H.; Vogt, R.

1999-12-01T23:59:59.000Z

124

Lithium/Manganese Dioxide (Li/MnO(2)) Battery Performance Evaluation: Final Report  

SciTech Connect (OSTI)

In February 1997, under the auspices of the Product Realization Program, an initiative to develop performance models for lithium/manganese dioxide-based batteries began. As a part of this initiative, the performance characteristics of the cells under a variety of conditions were determined, both for model development and for model validation. As a direct result of this work, it became apparent that possible Defense Program (DP) uses for batteries based on this cell chemistry existed. A larger effort aimed at mapping the performance envelope of this chemistry was initiated in order to assess the practicality of this cell chemistry, not only for DP applications, but also for other uses. The work performed included an evaluation of the cell performance as a function of a number of variables, including cell size, manufacturer, current, pulse loads, constant current loads, safety, etc. In addition, the development of new evaluation techniques that would apply to any battery system, such as those related to reliability assessments began. This report describes the results of these evaluations.

Ingersoll, D.; Clark, N.H.

1999-04-01T23:59:59.000Z

125

Water balance analysis and wastewater recycling investigation in electrolytic manganese industry of China — A case study  

Science Journals Connector (OSTI)

Abstract A water balance investigation was performed for a representative electrolytic manganese metal (EMM) enterprise to study the details of water consumption and generation in the production process. A new integrated wastewater treatment approach was put forward to recover useful chemicals from the process wastewater, which contained high concentrations of Mn2 +, Cr(VI), Cr3 +, and NH4+. Cr(VI) was recovered from the wastewater by ion exchange techniques and reused as EMM passivant. The remaining wastewater containing Mn2 + and NH4+ was returned to the leaching section before the impurity removal procedure to prepare electrolytes. Complete wastewater recycling was achieved after water balance regulation and optimization. Final demonstration line results proved that the proposed process is feasible and exhibits significant advantages of better treatment effects, lower costs and lower environmental impact compared to the traditional reduction–neutralization–sedimentation treatment method. With the adoption of the proposed approach, solid waste disposal cost and the required area for the landfill yard were decreased by 80%. Operating costs for wastewater treatment were lowered by 85%. Around 4.8 kg/t EMM of Mn2 +, 5.2 kg/t EMM of NH4+ and 0.24 kg/t EMM of Cr(VI) were recovered. The recycled wastewater proportion was increased from 6.2% to 100.0%. 1.168 m3/t EMM of fresh water was saved and the equivalent amount of discharging wastewater was reduced to the environment.

Fuyuan Xu; Linhua Jiang; Zhigang Dan; Xiaojuan Gao; Ning Duan; Guimei Han; Hong Zhu

2014-01-01T23:59:59.000Z

126

Oxidation state of manganese in zinc pyrophosphate: Probed by luminescence and EPR studies  

SciTech Connect (OSTI)

Zn{sub 2}P{sub 2}O{sub 7}: Mn was synthesized by wet chemical route and characterized by X-ray diffraction (XRD), photoluminescence (PL) and electron paramagnetic resonance (EPR) techniques. Photoluminescence spectrum shows two bands, one at 500 nm (green emission), which is attributed to the {sup 4}T{sub 1}({sup 4}G)-{sup 6}A{sub 1}({sup 6}S) transition of Mn{sup 2+} and other centered at 686 nm (red emission) is attributed to the electronic transition between {sup 2}E and {sup 4}A{sub 2} of Mn{sup 4+} accompanied with vibronic transitions. EPR spectroscopic studies also confirmed the presence of both Mn2+ and Mn4+ ions in zinc pyrophosphate with difference in the number of fine transitions and g values (Mn{sub 4+}, S=3/2, three fine transitions and g < 2.00; Mn{sup 2+} S=5/2, five fine transitions and g=2.00).Mn{sup 2+} is attributed to presence of Mn at 6-ccordinated Zn{sup 2+} site whereas Mn{sup 4+} is due to presence substitution of Mn{sup 4+} at Zn{sup 2+} site thereby invoking charge compensation by presence of interstitial oxygen ions around Mn{sup 4+} ion or due to substitution of manganese at distorted 5-coordinated zinc site.

Gupta, Santosh K., E-mail: santoshg@barc.gov.in; Kadam, R. M., E-mail: santoshg@barc.gov.in; Natarajan, V., E-mail: santoshg@barc.gov.in; Godbole, S. V., E-mail: santoshg@barc.gov.in [Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)

2014-04-24T23:59:59.000Z

127

Synergism between arsenite and proteasome inhibitor MG132 over cell death in myeloid leukaemic cells U937 and the induction of low levels of intracellular superoxide anion  

SciTech Connect (OSTI)

Increased oxygen species production has often been cited as a mechanism determining synergism on cell death and growth inhibition effects of arsenic-combined drugs. However the net effect of drug combination may not be easily anticipated solely from available knowledge of drug-induced death mechanisms. We evaluated the combined effect of sodium arsenite with the proteasome inhibitor MG132, and the anti-leukaemic agent CAPE, on growth-inhibition and cell death effect in acute myeloid leukaemic cells U937 and Burkitt's lymphoma-derived Raji cells, by the Chou–Talalay method. In addition we explored the association of cytotoxic effect of drugs with changes in intracellular superoxide anion (O{sub 2}{sup ?}) levels. Our results showed that combined arsenite + MG132 produced low levels of O{sub 2}{sup ?} at 6 h and 24 h after exposure and were synergic on cell death induction in U937 cells over the whole dose range, although the combination was antagonistic on growth inhibition effect. Exposure to a constant non-cytotoxic dose of 80 ?M hydrogen peroxide together with arsenite + MG132 changed synergism on cell death to antagonism at all effect levels while increasing O{sub 2}{sup ?} levels. Arsenite + hydrogen peroxide also resulted in antagonism with increased O{sub 2}{sup ?} levels in U937 cells. In Raji cells, arsenite + MG132 also produced low levels of O{sub 2}{sup ?} at 6 h and 24 h but resulted in antagonism on cell death and growth inhibition. By contrast, the combination arsenite + CAPE showed high levels of O{sub 2}{sup ?} production at 6 h and 24 h post exposure but resulted in antagonism over cell death and growth inhibition effects in U937 and Raji cells. We conclude that synergism between arsenite and MG132 in U937 cells is negatively associated to O{sub 2}{sup ?} levels at early time points after exposure. -- Highlights: ? Arsenic combined cytotoxic and anti-proliferative effects by Chou–Talalay method. ? Cytotoxic effect associated with superoxide levels as assessed by flow cytometry. ? Synergism between arsenite and MG132 in U937 leukemia cell line. ? Synergism turned into antagonism by low levels of hydrogen peroxide. ? Resistance to arsenic cytotoxicity linked to early superoxide anion increased levels.

Lombardo, Tomás [Laboratorio de Immunotoxicologia (LaITO), IDEHU-CONICET, Hospital de Clínicas, José de San Martín, Universidad de Buenos Aires (UBA), Buenos Aires (Argentina)] [Laboratorio de Immunotoxicologia (LaITO), IDEHU-CONICET, Hospital de Clínicas, José de San Martín, Universidad de Buenos Aires (UBA), Buenos Aires (Argentina); Cavaliere, Victoria; Costantino, Susana N. [Laboratorio de Inmunología Tumoral (LIT), IDEHU-CONICET, Facultad de Farmacia y Bioquímica, UBA, Buenos Aires (Argentina)] [Laboratorio de Inmunología Tumoral (LIT), IDEHU-CONICET, Facultad de Farmacia y Bioquímica, UBA, Buenos Aires (Argentina); Kornblihtt, Laura [Servicio de Hematología, Hospital de Clínicas, José de San Martín (UBA), Buenos Aires (Argentina)] [Servicio de Hematología, Hospital de Clínicas, José de San Martín (UBA), Buenos Aires (Argentina); Alvarez, Elida M. [Laboratorio de Inmunología Tumoral (LIT), IDEHU-CONICET, Facultad de Farmacia y Bioquímica, UBA, Buenos Aires (Argentina)] [Laboratorio de Inmunología Tumoral (LIT), IDEHU-CONICET, Facultad de Farmacia y Bioquímica, UBA, Buenos Aires (Argentina); Blanco, Guillermo A., E-mail: gblanco@ffyb.uba.ar [Laboratorio de Immunotoxicologia (LaITO), IDEHU-CONICET, Hospital de Clínicas, José de San Martín, Universidad de Buenos Aires (UBA), Buenos Aires (Argentina)

2012-02-01T23:59:59.000Z

128

Evaluation of iron- and manganese-based mono- and mixed-metallic oxygen carriers for chemical looping combustion  

Science Journals Connector (OSTI)

Abstract Chemical looping combustion (CLC) is an emerging technology for clean combustion of fossil fuels with inherent CO2 capture. In the present work, we investigate the use of iron and manganese based mixed oxides (MnxFe1?x–CeO2) supported on CeO2 as oxygen carriers in CLC. The low cost and low toxicity of iron and manganese make them interesting candidates for CLC, but both mono-metallic carriers suffer from issues of low reactivity, and manganese is additionally prone to form undesired spinel structures with typical oxide supports. Mono- and bimetallic oxygen carriers were synthesized across the entire spectrum of compositions from pure Mn to pure Fe (with x = 0, 0.1, 0.33, 0.5, 0.8, 0.9, 1), characterized, and tested in thermogravimetric and fixed-bed reactor studies using H2 and CH4 as fuels. We find that the use of ceria as support results in stable operation for all compositions of the metal phase, including pure Mn. Bimetallic carriers with high Fe content, which contain a FeMnO3 phase, exhibit an unusual, reversible de-alloying/re-alloying behavior during cyclic redox operation, which precludes any synergistic effects between the two metals and results in slowed reduction kinetics. However, Mn-rich carriers show a pronounced increase in carrier reactivity and selectivity for total oxidation of methane due to the addition of small amounts of Fe, indicating the promise of appropriately designed FeMn carriers as low-cost, environmentally benign oxygen carrier materials for chemical looping combustion.

Saurabh Bhavsar; Brian Tackett; Götz Veser

2014-01-01T23:59:59.000Z

129

Spatially resolved characterization of biogenic manganese oxideproduction within a bacterial biofilm  

SciTech Connect (OSTI)

Pseudomonas putida strain MnB1, a biofilm forming bacteria, was used as a model for the study of bacterial Mn oxidation in freshwater and soil environments. The oxidation of Mn{sub (aq)}{sup +2} by P. putida was characterized by spatially and temporally resolving the oxidation state of Mn in the presence of a bacterial biofilm using scanning transmission x-ray microscopy (STXM) combined with near edge x-ray absorption fine structure (NEXAFS) spectroscopy at the Mn-L{sub 2,3} absorption edges. Subsamples were collected from growth flasks containing 0.1 mM and 1 mM total Mn at 16, 24, 36 and 48 hours after inoculation. Immediately after collection, the unprocessed hydrated subsamples were imaged at 40 nm resolution. Manganese NEXAFS spectra were extracted from x-ray energy sequences of STXM images (stacks) and fit with linear combinations of well characterized reference spectra to obtain quantitative relative abundances of Mn(II), Mn(III) and Mn(IV). Careful consideration was given to uncertainty in the normalization of the reference spectra, choice of reference compounds, and chemical changes due to radiation damage. The STXM results confirm that Mn{sub (aq)}{sup +2} was removed from solution by P. putida and was concentrated as Mn(III) and Mn(IV) immediately adjacent to the bacterial cells. The Mn precipitates were completely enveloped by bacterial biofilm material. The distribution of Mn oxidation states was spatially heterogeneous within and between the clusters of bacterial cells. Scanning transmission x-ray microscopy is a promising tool to advance the study of hydrated interfaces between minerals and bacteria, particularly in cases where the structure of bacterial biofilms needs to be maintained.

Toner, Brandy; Fakra, Sirine; Villalobos, Mario; Warwick, Tony; Sposito, Garrison

2004-10-01T23:59:59.000Z

130

Manganese-loaded lipid-micellar theranostics for simultaneous drug and gene delivery to lungs  

Science Journals Connector (OSTI)

Abstract Gadolinium (Gd) contrast agents are predominantly used for T1 MR imaging. However, the high toxicity of Gd3 + and potential side effects including nephrogenic systemic fibrosis have led to the search for alternative T1 contrast agents. Since manganese (Mn) has paramagnetic properties with five unpaired electrons that permit high spin number, long electronic relaxation times, and labile water exchange, we evaluated Mn as a T1 magnetic resonance imaging (MRI) contrast agent for lung imaging. Here we report on the design and synthesis of multifunctional lipid-micellar nanoparticles (LMNs) containing Mn oxide (M-LMNs) for MRI that can also be used for DNA and drug delivery. Oleic acid-coated MnO nanoparticles were encapsulated in micelles composed of polyethylene glycol (PEG-2000), phosphatidylethanolamine (PE), DC-cholesterol, and dioleoyl-phosphatidylethanolamine (DOPE). The particles are taken up in vitro by human embryonic kidney (HEK293), Lewis lung carcinoma (LLC1), and A549 cells and are devoid of cytotoxicity. When administered to mice intranasally, they preferentially accumulate in the lungs. In vitro phantom and ex vivo lung MRI results confirmed that M-LMNs are able to enhance T1 MRI contrast. M-LMNs loaded with plasmid DNA and/or doxorubicin are efficiently taken up by HEK293 cells in vitro and by target cells in vivo. Taken together, these results demonstrate that M-LMNs are capable of simultaneously providing MRI contrast and DNA and/or drug delivery to target cells in the lung and therefore may prove useful as a lung theranostic, especially for lung cancers.

M. Howell; J. Mallela; C. Wang; S. Ravi; S. Dixit; U. Garapati; S. Mohapatra

2013-01-01T23:59:59.000Z

131

Effects of iron and manganese in culture solution on their concentrations in roots and shoots of rice plants (Oryza sativa L.) grown under anaerobic conditions  

E-Print Network [OSTI]

(~Or za sativa L. ) GROWN UNDER ANAEROBIC CONDITIONS A Thesis by RICHARD E. BACHA Approved as to style and content by: Chairman of Committee Head of Department 0 ember em er December 1976 g+g TO, I ABSTRACT Effects of Iron and Manganese... EFFECTS OF IRON AND MANGANESE IN CULTURE SOLUTION ON THEIR CONCENTRATIONS IN ROOTS AND SHOOTS OF RICE PLANTS (~Or za sativa L. ) GROWN UNDER ANAEROBIC CONDITIONS A Thesis by RICHARD E. BACHA Submitted to the Graduate College of Texas ASM Un...

Bacha, Richard E

1976-01-01T23:59:59.000Z

132

Manganese reduction/oxidation reaction on graphene composites as a reversible process for storing enormous energy at a fast rate  

E-Print Network [OSTI]

Oxygen reduction/evolution reaction (ORR/OER) is a basic process for fuel cells or metal air batteries. However, ORR/OER generally requires noble metal catalysts and suffers from low solubility (10-3 molar per liter) of O2, low kinetics rate (10-6 cm2/s) and low reversibility. We report a manganese reduction/oxidation reaction (MRR/MOR) on graphene/MnO2 composites, delivering a high capacity (4200 mAh/g), fast kinetics (0.0024 cm2/s, three orders higher than ORR/OER), high solubility (three orders than O2), and high reversibility (100%). We further use MRR/MOR to invent a rechargeable manganese ion battery (MIB), which delivers an energy density of 1200 Wh/Kg (several times of lithium ion battery), a fast charge ability (3 minutes), and a long cycle life (10,000 cycles). MRR/MOR renders a new class of energy conversion or storage systems with a very high energy density enabling electric vehicles run much more miles at one charge.

Chen, Yanyi; Shi, Shan; Li, Jia; Kang, Feiyu; Wei, Chunguang

2014-01-01T23:59:59.000Z

133

Microstructural characterization of high-manganese austenitic steels with different stacking fault energies  

SciTech Connect (OSTI)

Microstructures of tensile-deformed high-manganese austenitic steels exhibiting twinning-induced plasticity were analyzed by electron backscatter diffraction pattern observation and X-ray diffraction measurement to examine the influence of differences in their stacking fault energies on twinning activity during deformation. The steel specimen with the low stacking fault energy of 15 mJ/m{sup 2} had a microstructure with a high population of mechanical twins than the steel specimen with the high stacking fault energy (25 mJ/m{sup 2}). The <111> and <100> fibers developed along the tensile axis, and mechanical twinning occurred preferentially in the <111> fiber. The Schmid factors for slip and twinning deformations can explain the origin of higher twinning activity in the <111> fiber. However, the high stacking fault energy suppresses the twinning activity even in the <111> fiber. A line profile analysis based on the X-ray diffraction data revealed the relationship between the characteristics of the deformed microstructures and the stacking fault energies of the steel specimens. Although the variation in dislocation density with the tensile deformation is not affected by the stacking fault energies, the effect of the stacking fault energies on the crystallite size refinement becomes significant with a decrease in the stacking fault energies. Moreover, the stacking fault probability, which was estimated from a peak-shift analysis of the 111 and 200 diffractions, was high for the specimen with low stacking fault energy. Regardless of the difference in the stacking fault energies of the steel specimens, the refined crystallite size has a certain correlation with the stacking fault probability, indicating that whether the deformation-induced crystallite-size refinement occurs depends directly on the stacking fault probability rather than on the stacking fault energies in the present steel specimens. - Highlights: {yields} We studied effects of stacking fault energies on deformed microstructures of steels. {yields} Correlations between texture and occurrence of mechanical twinning are discussed. {yields} Evolutions of dislocations and crystallite are analyzed by line profile analysis.

Sato, Shigeo, E-mail: s.sato@imr.tohoku.ac.jp [Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan); Kwon, Eui-Pyo [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan); Imafuku, Muneyuki [Faculty of Engineering, Tokyo City University, Tokyo 158-8557 (Japan); Wagatsuma, Kazuaki [Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan); Suzuki, Shigeru [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan)

2011-08-15T23:59:59.000Z

134

Study Shows Roles of Receptor, Thiol on Adaptive Response  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Study Shows Roles of Receptor, Thiol on Adaptive Response Study Shows Roles of Receptor, Thiol on Adaptive Response Jeffrey Murley Jeffrey Murley, Ph.D. David Grdina, Ph.D. Low Dose program-supported scientists at The University of Chicago have gained more insight into adaptive protective responses indicating the role of oxidative stress, the role of reactive oxygen species (ROS), and the induction of SOD2 (manganese Superoxide Dismutase) activity. These changes are central to the production of adaptive protective responses. Why Study Adaptive Response? Exposing cells to low doses of ionizing radiation has been reported to elevate resistance to genomic damage when the same cells are subsequently exposed to a much higher dose of radiation. This phenomenon, called adaptive response, is characterized by an increase

135

Diane E. Cabelli's List of Publications  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

LEAF/Center for LEAF/Center for Radiation Chemistry Research | | Brunschwig | Cabelli | Cook | Creutz | Fujita | Holroyd | Lymar | Miller | Newton | Sutin | Wishart | Diane E. Cabelli List of Publications: 72. Greenleaf, W.B; Stroupe, M.E.; Hearn, A.S.; Cabelli, D.E.; Lepock, J.R.; Tainer, J.A.; Nick H.S.; Silverman, D.N. (submitted) “Role of Hydrogen Bonding in the Active Site of Manganese Superoxide Dismutase” Biochemistry 71. Sharma, V.K.; O’Connor, D.B.; Cabelli, D.E. (submitted) “Oxidation of Thiocyanate by Iron(V) in Alkaline Medium” Inorg. Chim. Acta 70. Hearn, A.S.; Fan, L.; Lepock, J.R.; Luba, J.P.; Greenleaf, W.B.; Cabelli, D.E.; Tainer, J.A.; Nick H.S.; Silverman, D.N. (in press) Catalytic and Structural Effects of Amino Acid Substitution at the Dimeric

136

Solar abundance of manganese: a case for the existence of near Chandrasekhar-mass Type Ia supernova progenitors  

E-Print Network [OSTI]

Context: Manganese is predominantly synthesised in Type Ia supernova (SN Ia) explosions. Owing to the entropy dependence of the Mn yield in explosive thermonuclear burning, SNe Ia involving near Chandrasekhar-mass white dwarfs (WDs) are predicted to produce Mn to Fe ratios significantly exceeding those of SN Ia explosions involving sub-Chandrasekhar mass primary WDs. Of all current supernova explosion models, only SN Ia models involving near-Chandrasekhar mass WDs produce [Mn/Fe] > 0.0. Aims: Using the specific yields for competing SN Ia scenarios, we aim to constrain the relative fractions of exploding near-Chandrasekhar mass to sub-Chandrasekhar mass primary WDs in the Galaxy. Methods: We extract the Mn yields from three-dimensional thermonuclear supernova simulations referring to different initial setups and progenitor channels. We then compute the chemical evolution of Mn in the Solar neighborhood, assuming SNe Ia are made up of different relative fractions of the considered explosion models. Results: We ...

Seitenzahl, Ivo R; Roepke, Friedrich K; Ruiter, Ashley J

2013-01-01T23:59:59.000Z

137

Graphite coated with manganese oxide/multiwall carbon nanotubes composites as anodes in marine benthic microbial fuel cells  

Science Journals Connector (OSTI)

Abstract Improving anode performance is of great significance to scale up benthic microbial fuel cells (BMFCs) for its marine application to drive oceanography instruments. In this study, manganese oxide (MnO2)/multiwall carbon nanotubes (MWCNTs) composites are prepared to be as novel anodes in the \\{BMFCs\\} via a direct redox reaction between permanganate ions (MnO4?) and MWCNTs. The results indicate that the MnO2/MWCNTs anode has a better wettability, greater kinetic activity and higher power density than that of the plain graphite (PG) anode. It is noted that the MnO2 (50% weight percent)/MWCNTs anode shows the highest electrochemical performance among them and will be a promising material for improving bioelectricity production of the BMFCs. Finally, a synergistic mechanism of electron transfer shuttle of Mn ions and their redox reactions in the interface between modified anode and bacteria biofilm are proposed to explain its excellent electrochemical performance.

Yubin Fu; Jian Yu; Yelong Zhang; Yao Meng

2014-01-01T23:59:59.000Z

138

Small-angle neutron scattering analysis of Mn–C clusters in high-manganese 18Mn–0.6C steel  

Science Journals Connector (OSTI)

Abstract Nanometer-scale particles (Mn–C clusters) were analyzed quantitatively using small-angle neutron scattering in 18Mn–0.6C (wt.%) austenite high-manganese steel. The size, number, and volume fraction of the particles were determined as a function of strain (0, 5, 15, 30, 45, 50%) at different temperatures (25 and 100 °C). The diameter of the cluster ranges from 2 to 14 nm in the matrix. The total volume fraction of the cluster significantly increases from 2.7 × 10? 6 to 8.7 × 10? 6 as the strain increases. Such clustering phenomenon is correlated to the serration behavior under loading in high-manganese steels.

Mihyun Kang; Eunjoo Shin; Wanchuck Woo; Young-Kook Lee

2014-01-01T23:59:59.000Z

139

Acute ethanol intake induces superoxide anion generation and mitogen-activated protein kinase phosphorylation in rat aorta: A role for angiotensin type 1 receptor  

SciTech Connect (OSTI)

Ethanol intake is associated with increase in blood pressure, through unknown mechanisms. We hypothesized that acute ethanol intake enhances vascular oxidative stress and induces vascular dysfunction through renin–angiotensin system (RAS) activation. Ethanol (1 g/kg; p.o. gavage) effects were assessed within 30 min in male Wistar rats. The transient decrease in blood pressure induced by ethanol was not affected by the previous administration of losartan (10 mg/kg; p.o. gavage), a selective AT{sub 1} receptor antagonist. Acute ethanol intake increased plasma renin activity (PRA), angiotensin converting enzyme (ACE) activity, plasma angiotensin I (ANG I) and angiotensin II (ANG II) levels. Ethanol induced systemic and vascular oxidative stress, evidenced by increased plasma thiobarbituric acid-reacting substances (TBARS) levels, NAD(P)H oxidase?mediated vascular generation of superoxide anion and p47phox translocation (cytosol to membrane). These effects were prevented by losartan. Isolated aortas from ethanol-treated rats displayed increased p38MAPK and SAPK/JNK phosphorylation. Losartan inhibited ethanol-induced increase in the phosphorylation of these kinases. Ethanol intake decreased acetylcholine-induced relaxation and increased phenylephrine-induced contraction in endothelium-intact aortas. Ethanol significantly decreased plasma and aortic nitrate levels. These changes in vascular reactivity and in the end product of endogenous nitric oxide metabolism were not affected by losartan. Our study provides novel evidence that acute ethanol intake stimulates RAS activity and induces vascular oxidative stress and redox-signaling activation through AT{sub 1}-dependent mechanisms. These findings highlight the importance of RAS in acute ethanol-induced oxidative damage. -- Highlights: ? Acute ethanol intake stimulates RAS activity and vascular oxidative stress. ? RAS plays a role in acute ethanol-induced oxidative damage via AT{sub 1} receptor activation. ? Translocation of p47phox and MAPKs phosphorylation are downstream effectors. ? Acute ethanol consumption increases the risk for acute vascular injury.

Yogi, Alvaro; Callera, Glaucia E. [Kidney Research Centre, Ottawa Hospital Research Institute, University of Ottawa, Ontario (Canada)] [Kidney Research Centre, Ottawa Hospital Research Institute, University of Ottawa, Ontario (Canada); Mecawi, André S. [Department of Physiology, Faculty of Medicine of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, SP (Brazil)] [Department of Physiology, Faculty of Medicine of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, SP (Brazil); Batalhão, Marcelo E.; Carnio, Evelin C. [Department of General and Specialized Nursing, College of Nursing of Ribeirão Preto, USP, São Paulo (Brazil)] [Department of General and Specialized Nursing, College of Nursing of Ribeirão Preto, USP, São Paulo (Brazil); Antunes-Rodrigues, José [Department of Physiology, Faculty of Medicine of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, SP (Brazil)] [Department of Physiology, Faculty of Medicine of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, SP (Brazil); Queiroz, Regina H. [Department of Clinical, Toxicological and Food Science Analysis, Faculty of Pharmaceutical Sciences, USP, São Paulo (Brazil)] [Department of Clinical, Toxicological and Food Science Analysis, Faculty of Pharmaceutical Sciences, USP, São Paulo (Brazil); Touyz, Rhian M. [Kidney Research Centre, Ottawa Hospital Research Institute, University of Ottawa, Ontario (Canada)] [Kidney Research Centre, Ottawa Hospital Research Institute, University of Ottawa, Ontario (Canada); Tirapelli, Carlos R., E-mail: crtirapelli@eerp.usp.br [Department of Psychiatric Nursing and Human Sciences, Laboratory of Pharmacology, College of Nursing of Ribeirão Preto, USP, Ribeirão Preto, SP (Brazil)

2012-11-01T23:59:59.000Z

140

Intrasphere and extrasphere effects of the influence of ammine complexes of transition metals on their catalytic activity in reactions of oxidation of manganese sulfate to the dioxide by atmospheric oxygen  

SciTech Connect (OSTI)

Manganese(II) sulfate is a waste product from the large-tonnage redox process for production of anthraquinone from aniline. Recovery of the original manganese dioxide and removal of manganese(II) sulfate from the wastewaters are economically and ecologically necessary. Liquid-phase low-temperature conversion of manganese(II) sulfate by the action of atmospheric oxygen blown through an aqueous solution of the salt containing ammine complexes of transition metals was studied earlier. It was shown that it does not depend only on intrasphere cations or extrasphere anions; it may be influenced by the effects of their interactions. The purpose of the present work was to study this influence in a complete factorial experiment of the CFE-3T type. It was found that homogeneous catalysis of oxidation of manganese(II) sulfate by atmospheric oxygen in presence of transition-metal ammines is determined to a considerable extent by the effects of pair interactions between complex-forming cations and extrasphere anions.

Eremeev, A.P.; Veselovskii, P.F.

1986-12-10T23:59:59.000Z

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141

Asymmetric deposition of manganese oxide in single walled carbon nanotube films as electrodes for flexible high frequency response electrochemical capacitors  

Science Journals Connector (OSTI)

Manganese oxide (MnO2) is a promising pseudocapacitive electrode material because of its high capacitance, abundant resource, low-cost, and environmental friendliness. However, its poor electrical and ionic conductivities and low stability hinder applications. Forming MnO2 nanocomposites with high surface area porous metal, carbon materials, or conducting polymers is a possible solution. In this work, we have developed a facile and scalable asymmetric in situ deposition method to incorporate MnO2 nanoparticles in conductive single walled carbon nanotube (SWCNT) films. The high porosity of vacuum filtrated SWCNT films accommodates pseudocapacitive MnO2 nanoparticles without sacrificing the mechanical flexibility and electrochemical stability of SWCNT films. We exposed one side of SWCNT films to acidic potassium permanganate (KMnO4) solution. The infiltrated \\{KMnO4\\} solution partially etches \\{SWCNTs\\} to create abundant mesopores, which ensure electrolyte ions efficiently access deposited MnO2. Meanwhile, the remaining SWCNT network serves as excellent current collectors. The electrochemical performance of the SWCNT–MnO2 composite electrodes depends on the porosity of SWCNT films, pH, and concentration of \\{KMnO4\\} solution, deposition temperature and time. Our optimized two-electrode electrochemical capacitor, with 1 M Na2SO4 in water as electrolyte, showed a superior performance with specific capacitance of 529.8 F g?1, energy density of 73.6 Wh kg?1, power density of 14.6 kW kg?1, excellent capacitance retention (99.9%) after 2000 charge and discharge cycles, and one of the highest reported frequency responses (knee frequency at 1318 Hz). The high performance flexible electrochemical capacitors have broad applications in portable electronics and electrical vehicles, especially when high frequency response is desired.

Jianmin Shen; Andong Liu; Yu Tu; Hong Wang; Rongrong Jiang; Jie Ouyang; Yuan Chen

2012-01-01T23:59:59.000Z

142

MnSOD marks cord blood late outgrowth endothelial cells and accompanies robust resistance to oxidative stress  

SciTech Connect (OSTI)

Cord blood is source of colony-forming progenitors to vascular endothelial cells for potential use in cell therapies. These cells-called blood late outgrowth endothelial cells (OECs)-have undergone endothelial differentiation, but appear to still possess functional properties different from mature endothelial cells. A large-scale comparative proteomics screen of cord blood OECs versus human vein endothelial cells (HUVECs) using two-dimensional gel electrophoresis and mass spectrometry identified specific expression of manganese superoxide dismutase (MnSOD), a key antioxidant enzyme expressed in the mitochondria, in OECs but not in HUVECs. Immunoblotting verified significant MnSOD levels in all OEC isolates tested and maintained throughout passaging. Endothelial function and cell survival/proliferation assays in the presence of high cytotoxic doses of the superoxide generator compound LY83583 showed OECs profoundly better protected against oxidative stress than HUVECs. Such cytoprotective levels of MnSOD cells could give therapeutic cell transplants a survival advantage in necrotic or ischemic conditions.

Cai Hao [Department of Obstetrics, University Hospital Zurich (Switzerland); Gehrig, Peter [Functional Genomics Center Zurich, University of Zurich, Swiss Federal Institute of Technology, Zurich (Switzerland); Scott, Thomas M. [Functional Genomics Center Zurich, University of Zurich, Swiss Federal Institute of Technology, Zurich (Switzerland); Zimmermann, Roland [Department of Obstetrics, University Hospital Zurich (Switzerland); Schlapbach, Ralph [Functional Genomics Center Zurich, University of Zurich, Swiss Federal Institute of Technology, Zurich (Switzerland); Zisch, Andreas H. [Department of Obstetrics, University Hospital Zurich (Switzerland) and Center for Integrative Human Physiology, University of Zurich, Zurich (Switzerland)]. E-mail: andreas.zisch@usz.ch

2006-11-17T23:59:59.000Z

143

Manganese and Ceria Sorbents for High Temperature Sulfur Removal from Biomass-Derived Syngas -- The Impact of Steam on Capacity and Sorption Mode  

SciTech Connect (OSTI)

Syngas derived from biomass and coal gasification for fuel synthesis or electricity generation contains sulfur species that are detrimental to downstream catalysts or turbine operation. Sulfur removal in high temperature, high steam conditions has been known to be challenging, but experimental reports on methods to tackle the problem are not often reported. We have developed sorbents that can remove hydrogen sulfide from syngas at high temperature (700 C), both in dry and high steam conditions. The syngas composition chosen for our experiments is derived from statistical analysis of the gasification products of wood under a large variety of conditions. The two sorbents, Cu-ceria and manganese-based, were tested in a variety of conditions. In syngas containing steam, the capacity of the sorbents is much lower, and the impact of the sorbent in lowering H{sub 2}S levels is only evident in low space velocities. Spectroscopic characterization and thermodynamic consideration of the experimental results suggest that in syngas containing 45% steam, the removal of H{sub 2}S is primarily via surface chemisorptions. For the Cu-ceria sorbent, analysis of the amount of H{sub 2}S retained by the sorbent in dry syngas suggests both copper and ceria play a role in H{sub 2}S removal. For the manganese-based sorbent, in dry conditions, there is a solid state transformation of the sorbent, primarily into the sulfide form.

Cheah, S.; Parent, Y. O.; Jablonski, W. S.; Vinzant, T.; Olstad, J. L.

2012-07-01T23:59:59.000Z

144

A New Partially Deprotonated Mixed-Valence Manganese(II,III) Hydroxide–Arsenate with Electronic Conductivity: Magnetic Properties of High- and Room-Temperature Sarkinite  

Science Journals Connector (OSTI)

A relevant feature of this new material is that it is actually the first member of the adamite-type family with mixed-valence manganese(II,III) and electronic conductivity. ... In particular, langbeinite-type compounds, such as NaTi2(PO4)3,(1) are used as superionic conductors,(2) iron hydroxylphosphate minerals like barbosalite Fe3(PO4)2(OH)2,(3) and rockbridgeite Fe5(PO4)3(OH)5,(4) as efficient catalysts to produce methyl methacrylate, a very important intermediate in a large number of chemical processes,(5) or triplite(6) or adamite,(6) primary manganese–iron phosphates and arsenates, M2(F/OH)(XO4) (M = Fe and Mn; X = P and As), and as precursors of electrode material like LiFe(OH)PO4(7) and LiFe(OH)AsO4(8) or LiMnPO4(9) for rechargeable Li-ion batteries. ... The complex structural chemistry of the adamite-type [M2(F/OH)(XO4)] (where M = Zn, Mg, Co, Mn, Cu, etc.; X = P and As) family,(10-19) with a wide variety of polymorphs,(20, 21) shows a large diversity of structural phases built up on |MO6| octahedra, |MO5| trigonal bipyramids linked to one another by |OH| ligands, and |XO4| [X = P and As] tetrahedra. ...

Imanol de Pedro; Jose M. Rojo; Jordi Rius; Oriol Vallcorba; Idoia Ruiz de Larramendi; Jesús Rodríguez Fernández; Luis Lezama; Teofilo Rojo

2012-04-20T23:59:59.000Z

145

Antioxidant Activity in the Zebra Mussel (Dreissena polymorpha) in Response to Triclosan Exposure  

Science Journals Connector (OSTI)

The biocide triclosan (TCS, 5-chloro-2-(2,4...Dreissena polymorpha). We measured the activity of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx), as well as the phase II detoxifying e...

Andrea Binelli; Marco Parolini; Alessandra Pedriali…

2011-05-01T23:59:59.000Z

146

Oxygen Concentration Microgradients for Cell Culture  

E-Print Network [OSTI]

Vecchiet, U. Senin, and M. F. Beal, “Age-Dependent IncreasesH. Brown Jr. , M. F. Beal, “Superoxide Dismutase Activity,M. Wilcox, D. G. Flood, M. F. Beal, R. H. Brown Jr. , R. W.

Park, Jaehyun

2010-01-01T23:59:59.000Z

147

Journal of the Geological Society, London, Vol. 168, 2011, pp. 805815. doi: 10.1144/0016-76492010-132. Hydrothermal origin of elevated iron, manganese and redox-sensitive trace  

E-Print Network [OSTI]

.1144/0016-76492010-132. 805 Hydrothermal origin of elevated iron, manganese and redox-sensitive trace elements in the c. 635 Ma Doushantuo cap carbonate JING HUANG1,2 , XUELEI CHU1,2 *, GANQING JIANG3 , LIANJUN FENG1 & HUAJIN, including REE, concentrations of the Doushantuo cap carbonate (c. 635 Ma) in South China show enrichment

Jiang, Ganqing

148

Advanced Recombinant Manganese Peroxidase for Biosynthesis of Lignin Bioproducts, Phase I Final Report, STTR Grant #: DE-SC0007503.  

SciTech Connect (OSTI)

The core purpose of this Phase I STTR was to evaluate the feasibility of a new method of producing a recombinant version of manganese peroxidase (MnP) enzyme. MnP is a potentially valuable enzyme for producing high value lignin products and also for industrial de-coloring operations such as biobleaching of pulp and color removal from textile dye effluents. This lignin-modifying enzyme is produced in small amounts by the native host, a white rot fungus. Previous work by Oregon State University developed a secreted recombinant version of the enzyme in the yeast Pichia pastoris. Unfortunately, the expression is barely moderate and the enzyme is heavily glycosylated, which inhibits purification. In this work, the gene for the enzyme is given a tag which targets production of the enzyme to the peroxisome. This is a promising approach since this location is also where heme and hydrogen peroxide are sequestered, which are both necessary cofactors for MnP. More than ten recombinant strains were constructed, verified, and expressed in the Pichia system. Constitutive (GAP) and methanol-induced promoters (AOX) were tried for peroxisomal targeted, cytosolic, and secreted versions of MnP. Only the secreted strains showed activity. The amount of expression was not significantly changed. The degree of glycosylation was lessened using the AOX (methanol) promotoer, but the resulting enzyme was still not able to be purified using immobilized metal affinity chromatography. Additional work beyond the scope of the defined Phase I project was undertaken to construct, verify, and express Pichia strains that mutated the MnP glycosylation sites to inhibit this process. These strains did not show significant activity. The cause is not known, but it is possible that these sites are important to the structure of the enzyme. Also beyond the scope proposed for our Phase I STTR, the team collaborated with AbSci, a startup with a new E. coli based expression system focused on the production of antibodies and enzymes containing disulfide bonds and requiring folding/post-translational modification. With only limited time remaining in the Phase I schedule, a single construct was made to produce MnP with this system. The enzyme was produced in the soluble fraction of the cell lysate, but no activity was measured. MnP from the existing recombinant source was used to act on lignin. The lignin was from a Kraft process and had a molecular weight of about 10,000 Da. Using 1000 Da dialysis membranes and UV-visible spectroscopy, no modification of either lignin was evident in the dialysate or the retentate. Assays using 2,6 dimethoxy phenol (DMP) as a substrate showed consistent activity throughout the project. In summary, these results fell far short of our expectations. A Phase II proposal was not submitted. Possible reasons for the failure of peroxisomal targeting include destruction by native hydrogen peroxide, native proteases, or unforeseen causes. The AbSci system was only lighted tested and further work may yield a strain with active enzyme. The lack of evidence for lignin modification may be due to the techniques employed. NMR or GC-MS studies may reveal evidence of modification.

Beatty, Christopher; Kitner, Joshua; Lajoie, Curtis; McClain, Sean; Potochnik, Steve

2012-12-13T23:59:59.000Z

149

DRIFT study of manganese/titania-based catalysts for low-temperature selective catalytic reduction of NO with NH{sub 3}  

SciTech Connect (OSTI)

Manganese oxides and iron-manganese oxides supported on TiO{sub 2} were prepared by the sol-gel method and used for low-temperature selective catalytic reduction (SCR) of NO with NH{sub 3}. Based on the previous study, Mn(0.4)/TiO{sub 2} and Fe(0.1)-Mn(0.4)/TiO{sub 2} were then selected to carry out the in situ diffuse reflectance infrared transform spectroscopy (DRIFT) investigation for revealing the reaction mechanism. The DRIFT spectroscopy for the adsorption of NH{sub 3} indicated the presence of coordinated NH{sub 3} and NH{sub 4}{sup +} on both of the two catalysts. When NO was introduced, the coordinated NH{sub 3} on the catalyst surface was consumed rapidly, indicating these species could react with NO effectively. When NH{sub 3} was introduced into the sample preadsorbed with NO + O{sub 2}, SCR reaction would not proceed on Mn(0.4)/TiO{sub 2}. However, for Fe(0.1)-Mn(0.4)/TiO{sub 2} the bands due to coordinated NH{sub 3} on Fe{sub 2}O{sub 3} were formed. Simultaneously, the bidentate nitrates were transformed to monodentate nitrates and NH{sub 4}{sup +} was detected. NO{sub 2} from the oxidation of NO on catalyst could react with NH{sub 4}{sup +} leading to the reduction of NO. Therefore, it was suggested that the SCR reaction on Fe(0.1)-Mn(0.4)/TiO{sub 2} could also take place in a different way from the reactions on Mn(0.4)/TiO{sub 2} proposed by other researchers. Furthermore, the SCR reaction steps for these two kinds of catalysts were proposed. 29 refs., 9 figs.

Zhongbiao Wu; Boqiong Jiang; Yue Liu; Haiqiang Wang; Ruiben Jin [Zhejiang University, Hangzhou (China). Dept. of Environmental Engineering

2007-08-15T23:59:59.000Z

150

Development of Surface Complexation Models of Cr(VI) Adsorption on Soils, Sediments and Model Mixtures of Kaolinite, Montmorillonite, ?-Alumina, Hydrous Manganese and Ferric Oxides and Goethite  

SciTech Connect (OSTI)

Hexavalent chromium is a highly toxic contaminant that has been introduced into aquifers and shallow sediments and soils via many anthropogenic activities. Hexavalent chromium contamination is a problem or potential problem in the shallow subsurface at several DOE sites, including Hanford, Idaho National Laboratory, Los Alamos National Laboratory and the Oak Ridge Reservation (DOE, 2008). To accurately quantify the fate and transport of hexavalent chromium at DOE and other contaminated sites, robust geochemical models, capable of correctly predicting changes in chromium chemical form resulting from chemical reactions occurring in subsurface environments are needed. One important chemical reaction that may greatly impact the bioavailability and mobility of hexavalent chromium in the subsurface is chemical binding to the surfaces of particulates, termed adsorption or surface complexation. Quantitative thermodynamic surface complexation models have been derived that can correctly calculate hexavalent chromium adsorption on well-characterized materials over ranges in subsurface conditions, such pH and salinity. However, models have not yet been developed for hexavalent chromium adsorption on many important constituents of natural soils and sediments, such as clay minerals. Furthermore, most of the existing thermodynamic models have been developed for relatively simple, single solid systems and have rarely been tested for the complex mixtures of solids present in real sediments and soils. In this study, the adsorption of hexavalent chromium was measured as a function of pH (3-10), salinity (0.001 to 0.1 M NaNO3), and partial pressure of carbon dioxide(0-5%) on a suite of naturally-occurring solids including goethite (FeOOH), hydrous manganese oxide (MnOOH), hydrous ferric oxide (Fe(OH)3), ?-alumina (Al2O3), kaolinite (Al2Si2O5(OH)4), and montmorillonite (Na3(Al, Mg)2Si4O10(OH)2?nH2O). The results show that all of these materials can bind substantial quantities of hexavalent chromium, especially at low pH. Unexpectedly, experiments with the clay minerals kaolinite and montmorillonite suggest that hexavalent chromium may interact with these solids over much longer periods of time than expected. Furthermore, hexavalent chromium may irreversibly bind to these solids, perhaps because of oxidation-reduction reactions occurring on the surfaces of the clay minerals. More work should be done to investigate and quantify these chemical reactions. Experiments conducted with mixtures of goethite, hydrous manganese oxide, hydrous ferric oxide, ?-alumina, montmorillonite and kaolinite demonstrate that it is possible to correctly predict hexavalent chromium binding in the presence of multiple minerals using thermodynamic models derived for the simpler systems. Further, these models suggest that of the six solid considered in this study, goethite is typically the solid to which most of the hexavalent chromium will bind. Experiments completed with organic-rich and organic-poor natural sediments demonstrate that in organic-rich substrates, organic matter is likely to control uptake of the hexavalent chromium. The models derived and tested in this study for hexavalent chromium binding to ?-alumina, hydrous manganese oxide, goethite, hydrous ferric oxide and clay minerals can be used to better predict changes in hexavalent chromium bioavailability and mobility in contaminated sediments and soils.

Koretsky, Carla [Western Michigan University] [Western Michigan University

2013-11-29T23:59:59.000Z

151

Structural And Physical Characterization of Tetranuclear [Mn**II(3)Mn**IV] And [Mn**II(2)Mn**III(2)] Valence-Isomer Manganese Complexes  

SciTech Connect (OSTI)

Two tetranuclear Mn complexes with an average Mn oxidation state of +2.5 have been prepared. These valence isomers have been characterized by a combination of X-ray crystallography, X-ray absorption spectroscopy, and magnetic susceptibility. The Mn{sup II}{sub 3}Mn{sup IV} tetramer has the Mn ions arranged in a distorted tetrahedron, with an S = 6 ground spin state, dominated by ferromagnetic exchange among the manganese ions. The Mn{sup II}{sub 2}Mn{sup III}{sub 2} tetramer also has a distorted tetrahedral arrangement of Mn ions but shows magnetic behavior, suggesting that it is a single-molecule magnet. The X-ray absorption near-edge structure (XANES) spectra for the two complexes are similar, suggesting that, while Mn XANES has sufficient sensitivity to distinguish between trinuclear valence isomers (Alexiou et al. Inorg. Chem. 2003, 42, 2185), similar distinctions are difficult for tetranuclear complexes such as that found in the photosynthetic oxygen-evolving complex.

Zaleski, C.M.; Weng, T.-C.; Dendrinou-Samara, C.; Alexiou, M.; Kanakaraki, P.; Hsieh, W.-Y.; Kampf, J.; Penner-Hahn, J.E.; Pecoraro, V.L.; Kessissoglou, D.P.

2009-05-28T23:59:59.000Z

152

Stability and Rate Capability of Al Substituted Lithium-Rich High-Manganese Content Oxide Materials for Li-Ion Batteries  

SciTech Connect (OSTI)

The structures, electrochemical properties and thermal stability of Al-substituted lithium-excess oxides, Li{sub 1.2}Ni{sub 0.16} Mn{sub 0.56}Co{sub 0.08-y}Al{sub y}O{sub 2} (y = 0, 0.024, 0.048, 0.08), are reported, and compared to the stoichiometric compounds, LiNi{sub z}Mn{sub z}Co{sub 1-2z}O{sub 2}. A solid solution was found up to at least y = 0.06. Aluminum substitution improves the poor thermal stability while preserving the high energy density of lithium-excess oxides. However, these high manganese compositions are inferior to the lithium stoichiometric materials, LiNi{sub z}Mn{sub z}Co{sub 1-2z}O{sub 2} (z = 0.333, 0.4), in terms of both power and thermal stability.

Li, Zheng; Chernova, Natasha A.; Feng, Jijun; Upreti, Shailesh; Omenya, Fredrick; Whittingham, M. Stanley (SUNY-Binghamton)

2012-03-15T23:59:59.000Z

153

Reactive Gliosis Reactive Oxygen Species: Superoxide  

E-Print Network [OSTI]

motor output. Reafferent Control in Electric Communication Reafferent Control in Electric Communication Electrocommunication; Electrical communication Definition Every motor act that an animal produces will elicit sensory the night, and sensory feedback from skeletal muscles can be used to improve motor control. On the other

154

Roles of TNFα Signaling and NFκB in Thiol- and Low Dose  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Roles of TNFα Signaling and NFκB in Thiol- and Low Dose Radiation-Induced Roles of TNFα Signaling and NFκB in Thiol- and Low Dose Radiation-Induced Adaptive Responses Jeffrey S. Murley The University of Chicago Abstract To better investigate the roles of tumor necrosis factor alpha (TNFα) signaling processes and nuclear transcription factor κB (NFκB) activation on the induction of manganese superoxide dismutase (SOD2) mediated adaptive responses, we employed a two by two experimental matrix that includes the use of both wild type C57BL/6 and C57BL/6 tumor necrosis factor receptor 1 and 2 (TNFR1-R2-) knockout mice, and ras/c-myc transfected wild type and TNFR1-R2- knockout mouse embryo fibroblasts (MEF). MEF were immortalized in order to facilitate their use in our mouse models to test the role of normal or TNFR1-R2- stromal cells and tissues on their responses to thiol

155

Action of manganese on puberty  

E-Print Network [OSTI]

) stimulated luteinizing hormone (LH) release in prepubertal rats. Incubation of medial basal hypothalamus (MBH) in vitro showed this effect was due to a Mn-induced stimulation of luteinizing hormone releasing hormone (LHRH). Further demonstration...

Lee, Bo Yeon

2007-09-17T23:59:59.000Z

156

Biogenesis, Turnover, and Mode of Action of Plant MicroRNAs  

Science Journals Connector (OSTI)

...proteins HYL1 and SE promote accurate in vitro processing of pri-miRNA by DCL1. Proc. Natl. Acad. Sci. USA 105 : 9970-9975. Dugas, D.V. and Bartel, B. (2008). Sucrose induction of Arabidopsis miR398 represses two Cu/Zn superoxide dismutases...

Kestrel Rogers; Xuemei Chen

2013-07-23T23:59:59.000Z

157

MicroRNA-mediated Systemic Down-regulation of Copper Protein Expression in Response to Low Copper  

E-Print Network [OSTI]

MicroRNA-mediated Systemic Down-regulation of Copper Protein Expression in Response to Low Copper 44519, Egypt In plants, copper is an essential micronutrient required for photosynthesis. Two of the most abundant copper proteins, plastocyanin and copper/zinc superoxide dismutase, are found

158

Physicochemical study of the system sodium superoxide —sodium oxide  

Science Journals Connector (OSTI)

1. It was shown that NaO2 begins to decompose at about 120° in an atmosphere of dry oxygen and at about 80–90° i...

T. V. Rode; G. A. Golder

1956-01-01T23:59:59.000Z

159

DATABASE Open Access SORGOdb: Superoxide Reductase Gene Ontology  

E-Print Network [OSTI]

architecture. SORGOdb supplies a simple user-friendly web-based database for retrieving and exploring relevant billion years ago, the intense photosyn- thetic activity of cyanobacteria caused the largest envir

Paris-Sud XI, Université de

160

Structural Sequestration of Uranium in Bacteriogenic Manganese...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of metal-contaminated waters (in engineered remediation technologies, for example)?" Uranium is a key contaminant of concern at US DOE sites and shuttered mining and ore...

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

X-ray spectroscopy of manganese clusters  

SciTech Connect (OSTI)

Much of this thesis represents the groundwork necessary in order to probe Mn clusters more productively than with conventional Mn K-edge XAS and is presented in Part 1. Part 2 contains the application of x-ray techniques to Mn metalloproteins and includes a prognosis at the end of each chapter. Individual Mn oxidation states are more readily distinguishable in Mn L-edge spectra. An empirical mixed valence simulation routine for determining the average Mn oxidation state has been developed. The first Mn L-edge spectra of a metalloprotein were measured and interpreted. The energy of Mn K{beta} emission is strongly correlated with average Mn oxidation state. K{beta} results support oxidation states of Mn(III){sub 2}(IV){sub 2} for the S{sub 1} state of Photosystem II chemical chemically reduced preparations contain predominantly Mn(II). A strength and limitation of XAS is that it probes all of the species of a particular element in a sample. It would often be advantageous to selectively probe different forms of the same element. The first demonstration that chemical shifts in x-ray fluorescence energies can be used to obtain oxidation state-selective x-ray absorption spectra is presented. Spin-dependent spectra can also be used to obtain a more simplified picture of local structure. The first spin-polarized extended x-ray absorption fine structure using Mn K{beta} fluorescence detection is shown.

Grush, M.M. [Univ. of California, Davis, CA (United States). Dept. of Applied Science; [Lawrence Berkeley National Lab., CA (United States). Energy and Environment Div.

1996-06-01T23:59:59.000Z

162

Color stable manganese-doped phosphors  

DOE Patents [OSTI]

A lighting apparatus capable of emitting white light includes a semiconductor light source; and a phosphor material radiationally coupled to the light source. The phosphor material includes a color-stable Mn.sup.+4 doped phosphor prepared by a process including providing a phosphor of formula I; A.sub.x[MF.sub.y]:Mn.sup.+4 I and contacting the phosphor in particulate form with a saturated solution of a composition of formula II in aqueous hydrofluoric acid; A.sub.x[MF.sub.y]; II wherein A is Li, Na, K, Rb, Cs, NR.sub.4 or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; R is H, lower alkyl, or a combination thereof; x is the absolute value of the charge of the [MF.sub.y] ion; and y is 5, 6 or 7. In particular embodiments, M is Si, Ge, Sn, Ti, Zr, or a combination thereof.

Lyons, Robert Joseph; Setlur, Anant Achyut; Deshpande, Anirundha Rajendra; Grigorov, Ljudmil Slavchev

2014-04-29T23:59:59.000Z

163

Color stable manganese-doped phosphors  

DOE Patents [OSTI]

A process for preparing color stable Mn.sup.+4 doped phosphors includes providing a phosphor of formula I; A.sub.x[MF.sub.y]:Mn.sup.+4 I and contacting the phosphor in particulate form with a saturated solution of a composition of formula II in aqueous hydrofluoric acid; A.sub.x[MF.sub.y]; II wherein A is Li, Na, K, Rb, Cs, NR.sub.4 or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; R is H, lower alkyl, or a combination thereof; x is the absolute value of the charge of the [MF.sub.y] ion; and y is 5, 6 or 7. In particular embodiments, M is Si, Ge, Sn, Ti, Zr, or a combination thereof. A lighting apparatus capable of emitting white light includes a semiconductor light source; and a phosphor composition radiationally coupled to the light source, and which includes a color stable Mn.sup.+4 doped phosphor.

Lyons, Robert Joseph (Burnt Hills, NY); Setlur, Anant Achyut (Niskayuna, NY); Deshpande, Anirudha Rajendra (Twinsburg, OH); Grigorov, Ljudmil Slavchev (Sofia, BG)

2012-08-28T23:59:59.000Z

164

Manganese oxide composite electrodes for lithium batteries  

DOE Patents [OSTI]

An activated electrode for a non-aqueous electrochemical cell is disclosed with a precursor of a lithium metal oxide with the formula xLi.sub.2MnO.sub.3.(1-x)LiMn.sub.2-yM.sub.yO.sub.4 for 0

Thackeray, Michael M. (Naperville, IL); Johnson, Christopher S. (Naperville, IL); Li, Naichao (Croton on Hudson, NY)

2007-12-04T23:59:59.000Z

165

Manganese oxide composite electrodes for lithium batteries  

DOE Patents [OSTI]

An activated electrode for a non-aqueous electrochemical cell is disclosed with a precursor thereof a lithium metal oxide with the formula xLi.sub.2MnO.sub.3.(1-x)LiMn.sub.2-yM.sub.yO.sub.4 for 0.5

Johnson, Christopher S. (Naperville, IL); Kang, Sun-Ho (Naperville, IL); Thackeray, Michael M. (Naperville, IL)

2009-12-22T23:59:59.000Z

166

Magnetism in bcc and fcc manganese  

Science Journals Connector (OSTI)

Density-functional theory is used to compute the ferromagnetic moment as a function of lattice constant for bcc and fcc Mn. For bcc Mn, a relatively small moment is found in the lattice-constant range 5.205.90 a.u., with a discontinuous low-spin to high-spin transition occurring somewhere in the double-moment region 5.90?7.275 a.u., with a discontinuous zero-moment to high-moment transition occurring near a=7.275 a.u. Information obtained from magnetic susceptibility calculations is used to predict the magnetic order of the ground state in some of the lattice-constant ranges considered. The susceptibility calculations indicate that bcc Mn has a ferromagnetic ground state in the range 5.26.8 a.u.

G. Fuster; N. E. Brener; J. Callaway; J. L. Fry; Y. Z. Zhao; D. A. Papaconstantopoulos

1988-07-01T23:59:59.000Z

167

Drinking Water Problems: Iron and Manganese (Spanish)  

E-Print Network [OSTI]

el agua para remover las impurezas. Usted quiz? pueda abrir un nuevo pozo en un lugar diferente o completar el pozo existente en una formaci?n diferente de agua. P?dale a un perforador de pozos consejo acerca de estas opciones. Si decide tratar el.... La inyec- ci?n debe ocurrir antes del tanque de presi?n y tan cerca al punto de descarga del pozo como sea posi- ble. El tratamiento por compuestos de fosfato es relati- vamente barato, pero pueden haber desventajas al rato, el hierro y/o manganeso...

Dozier, Monty; McFarland, Mark L.

2004-02-20T23:59:59.000Z

168

BNL Photo- and Radiation Chemistry Group Members  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and Radiation Chemistry Group and Radiation Chemistry Group Chemistry Department, Brookhaven National Laboratory Staff Diane E. Cabelli Redox chemistry of high oxidation state transition-metal complexes, particularly CuIII, MnIII/MnIV; Superoxide chemistry in aqueous solutions: dismutation of superoxide radical; copper-zinc superoxide dismutase and model compounds. Andrew R. Cook Excited state structure, dynamics and electron transfer reactions of a variety of organic radicals in both low temperature matrices and room temperature solutions using radiation chemistry techniques. Robert A. Crowell Ultrafast reaction phenomena. Etsuko Fujita Photochemistry of transition-metal complexes, small molecule activation by high- and low-oxidation state metal complexes; and biomimetic chemistry of porphyrins and enzymes.

169

Diane E. Cabelli  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

E. Cabelli E. Cabelli Picture of Diane E. Cabelli Chemist Redox chemistry of high oxidation state transition-metal complexes, particularly CuIII, MnIII/MnIV; Superoxide chemistry in aqueous solutions: dismutation of superoxide radical; copper-zinc superoxide dismutase and model compounds. Telephone #: (631) 344-4361 cabelli@bnl.gov A.B. Bryn Mawr College, 1973; Ph.D. University of Texas, Austin, 1979 Research Associate, Conservation Center, Institute of Fine Arts, New York University, 3/80-3/81; Research Associate, Brookhaven National Laboratory, 3/81-10/83; Assistant Chemist, BNL, 10/83-12/87; Visiting Scientist, Riso National Laboratory, Denmark, 8/85-7/86; Associate Chemist, BNL, 1/88-9/89; Associate Chemist, continuing, BNL, 10/89-9/95; chemist, continuing, BNL,

170

Kinetic Modeling of Oxidation of Antibacterial Agents by Manganese  

E-Print Network [OSTI]

related model compounds (structures shown in Table S1). The antibacterials included two phenols (triclosan

Huang, Ching-Hua

171

Studies on Lithium Manganese Rich MNC Composite Cathodes  

Broader source: Energy.gov [DOE]

2013 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting

172

THE MANGANESE DEPOSITS OF THE PAMPEAN RANGES, ARGENTINA  

Science Journals Connector (OSTI)

...OF THE PAMPEAN RANGES, ARGENTINA Pablo Rodrigo Leal 1 Maria Jose Correa 2 Silvia J...Leal, P.R., Hartmann, L.A., Santos, J.O.S., Miro, R.C. Ramos...Pampean Ranges, Argentina Leal Pablo Rodrigo Author leal@gl.fcen.uba.ar University...

Pablo Rodrigo Leal; María José Correa; Silvia J. Ametrano; Ricardo O. Etcheverry; Milka K. de Brodtkorb

173

Examining Hysteresis in Lithium- and Manganese-Rich Composite...  

Broader source: Energy.gov (indexed) [DOE]

Program 1. Reed, Ceder, Van der Ven, Electrochem Solid St. Lett. 2001, 4, A78-A81 2. Armstrong et al. Chem. Mater. 2004 16, 3106-3118 Collaborations 19 Colleagues at Oak Ridge &...

174

Manganese Oxidation In A Natural Marine Environment- San Antonio Bay  

E-Print Network [OSTI]

and can be oxidized to any higher oxidation state, but Mn4+ is the most stable form first achieved (Stumm and Morgan 1996; Armstrong 2008). Mn3+ is a transitional/ metastable state that persists in nature before being further oxidized to the stable form... of Mn4+, which has also been described as a thermodynamic sink (Hem and Lind 1983; Stumm and Morgan 1996; Armstrong 2008). Mn oxides are found in the geologic record associated with other metal oxides such as iron (Fe) and cerium (Ce) (Braun et al...

Neyin, Rosemary Ogheneochuko

2013-04-12T23:59:59.000Z

175

Assessing Exposures to Particulate Matter and Manganese in Welding Fumes  

E-Print Network [OSTI]

titanium and zinc; non-metal constituents such as fluorides and silica; and gases such as carbon monoxide

LIU, SA

2010-01-01T23:59:59.000Z

176

Biogeochemistry of manganese in ferruginous Lake Matano, Indonesia  

SciTech Connect (OSTI)

This study explores Mn biogeochemistry in a stratified, ferruginous lake, a modern analogue to ferruginous oceans. Intense Mn cycling occurs in the chemocline where Mn is recycled at least 15 times before sedimentation. The product of biologically catalyzed Mn oxidation in Lake Matano is birnessite. Although there is evidence for abiotic Mn reduction with Fe(II), Mn reduction likely occurs through a variety of pathways. The flux of Fe(II) is insufficient to balance the reduction of Mn at 125m depth in the water column, and Mn reduction could be a significant contributor to CH{sub 4} oxidation. By combining results from synchrotron-based X-ray fluorescence and X-ray spectroscopy, extractions of sinking particles, and reaction transport modeling, we find the kinetics of Mn reduction in the lake's reducing waters are sufficiently rapid to preclude the deposition of Mn oxides from the water column to the sediments underlying ferruginous water. This has strong implications for the interpretation of the sedimentary Mn record.

Jones, C.; Crowe, S.A.; Sturm, A.; Leslie, K.L.; MacLean, L.C. W.; Katsev, S.; Henny, C.; Fowle, D.A.; Canfield, D.E. (USD-Netherlands); (Kansas); (Saskatchewan); (UMM); (LIPI)

2012-12-13T23:59:59.000Z

177

Manganese-stabilized austenitic stainless steels for fusion applications  

DOE Patents [OSTI]

An austenitic stainless steel that is comprised of Fe, Cr, Mn, C but no Ni or Nb and minimum N. To enhance strength and fabricability minor alloying additions of Ti, W, V, B and P are made. The resulting alloy is one that can be used in fusion reactor environments because the half-lives of the elements are sufficiently short to allow for handling and disposal.

Klueh, Ronald L. (Knoxville, TN); Maziasz, Philip J. (Oak Ridge, TN)

1990-01-01T23:59:59.000Z

178

Manganese in Texas Soils and its Relation to Crops.  

E-Print Network [OSTI]

.0164 .0134 ---- .0149 .0126 .0129 .0132 .0172 ---- .0144 .0145 .0150 .0120 ---- .0138 .0127 .0164 .0168 ---- .0156 Kafir grams 5.5 4.7 4.5 7.0 30.5 28.2 29.3 28.5 31 . 0 29.7 25.5 29.5 27.5 10.5 12.2 11.3 10.5 10... ... 100 milligrams. 7.5 Trace Trace 1.87 .93 1.99 3.08 4 .8!) 5.11 4.57 6.06 .......... Trace .......... I .40 .......... 2.53 ... 6:oo' " .......... 5.76 Mn removed by cotton mg. Trace .0104 .0150 .0234 .0268 Average Mn...

Carlyle, E. C. (Elmer Cardinal)

1931-01-01T23:59:59.000Z

179

Manganese oxide minerals: Crystal structures and economic and environmental significance  

Science Journals Connector (OSTI)

...ability to remove the green tint imparted by iron...are the predominant ore minerals in most of today’s commercially...as coatings on other mineral grains. Mn is highly...pH, organic matter, lime, and phosphate on heavy...28). The major Mn minerals reported in soils are...

Jeffrey E. Post

1999-01-01T23:59:59.000Z

180

Thermodynamic Investigations of Lithium- and Manganese-Rich Transition...  

Broader source: Energy.gov (indexed) [DOE]

Voltage Fade Participants (Anthony Burrell, ANL) Cell Fabrication Facility (Andrew Jansen, ANL) Illinois Institute of Technology (Jai Prakash) Vehicle Technologies Program...

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Unusual structure and magnetism in manganese oxide nanoclusters  

E-Print Network [OSTI]

We report an unusual evolution of structure and magnetism in stoichiometric MnO clusters based on an extensive and unbiased search through the potential-energy surface within density functional theory. The smaller clusters, ...

Ganguly, Shreemoyee

182

Carbon sequestration in reclaimed manganese mine land at Gumgaon, India  

Science Journals Connector (OSTI)

Carbon emission is supposed to be the strongest factor for global warming. Removing atmospheric carbon and storing it in the terrestrial biosphere is one of the cost-effective options, to compensate greenhouse...

Asha A. Juwarkar; K. L. Mehrotraa; Rajani Nair…

2010-01-01T23:59:59.000Z

183

Transuranic interfacial reaction studies on manganese oxide mineral surfaces  

E-Print Network [OSTI]

Sciences Division, The Glenn T. Seaborg Center, Lawrencethank the members of the Glenn T. Seaborg Center for their

2002-01-01T23:59:59.000Z

184

Addressing the Voltage Fade Issue with Lithium-Manganese-Rich...  

Broader source: Energy.gov (indexed) [DOE]

Zonghai Chen, Dennis Dees, Kevin Gallagher, Hakim Iddir, Brian Ingram, Christopher Johnson, Wenquan Lu, Nenad Markovic, Dean Miller, Yan Qin, Yang Ren, Michael Thackeray, Lynn...

185

Hyperfine structure of the ground state in singly ionized manganese  

Science Journals Connector (OSTI)

......configuration interaction (CI) code civ3 (Hibbert 1975b; Hibbert...when the CSFs which an inner ns2 subshell are included, particularly...corrections to the three filled ns2 subshells, replacing the orbitals...from replacements of the form ns2 1S (ns ms) 3S, as expected......

R. J. Blackwell-Whitehead; A. Toner; A. Hibbert; J. Webb; S. Ivarsson

2005-12-01T23:59:59.000Z

186

Manganese-based sorbents for coal gas desulfurization  

SciTech Connect (OSTI)

The intent of this study is to perform a preliminary screening on a particular Mn-based sorbent, CST-939 (from Chemetals), for hot gas desulfurization. The purpose of the preliminary screening is to determine which temperature and type of coal gas this sorbent demonstrates the greatest capacity and efficiency for sulfur removal. The following conclusions were made from the data collected on the CST-939 sorbent: The sorbent efficiency and capacity are much greater at 343{degrees}C (650{degrees}F) than at 871{degrees}C (1,600{degrees}F). The sorbent efficiency and capacity are much greater in the presence of the more highly-reducing Shell gas than with the less-reducing KRW gas. The sorbent showed tremendous capacity for sulfur pickup, with actual loadings as high as 21 weight percent. Oxidative regeneration at 871{degrees}C (1,600{degrees}F) appeared to decompose sulfate; however, unusually high SO{sub 2} release during the second sulfidations and/or reductive regenerations indicated incomplete regeneration. The average crush strength of the reacted sorbent did not indicate any loss of strength as compared to the fresh sorbent. Superior sorbent performance was obtained in the presence of simulated Shell gas at 538{degrees}C (1,000{degrees}F).

Gasper-Galvin, L.D.; Fisher, E.P. [USDOE Morgantown Energy Technology Center, WV (United States); Goyette, W.J. [Chemetals, Inc., Baltimore, MD (United States)

1996-12-31T23:59:59.000Z

187

Effects of Manganese on Carcinogenicity and Metabolism of Nickel Subsulfide  

Science Journals Connector (OSTI)

...MIBK was evaporated overnight in a water bath at 37 under a stream of nitrogen...individually in 10 ml of distilled water, with a motor-driven glass homogenizer (Duall...diluted to 25 ml with distilled water. Duplicate aliquots (4.5 ml...

F. William Sunderman, Jr.; Kazimierz S. Kasprzak; Thomas J. Lau; Philip P. Minghetti; Ronald M. Maenza; Nancy Becker; Claude Onkelinx; and Peter J. Goldblatt

1976-05-01T23:59:59.000Z

188

A ROLE FOR MANGANESE IN OXYGEN EVOLUTION IN PHOTOSYNTHESIS  

E-Print Network [OSTI]

synthesis, Topics jn Photosynthesis, vol. 2, J. Barber,and J. R. Benemann, in Photosynthesis in Relation to ModelProcesses of Photosynthesis, Topics in Photosynthesis, vol.

Sauer, Kenneth

2012-01-01T23:59:59.000Z

189

Electron Energy-Loss Safe-Dose Limits for Manganese Valence Measurements in Environmentally Relevant Manganese Oxides  

E-Print Network [OSTI]

19717-1303, United States § U.S. Army Engineer Research & Development Center, 3909 Halls Ferry Road are among the strongest mineral oxidants in the environment and impose significant influence on mobility. INTRODUCTION Mn exists in the 2+, 3+, and 4+ valence states in natural environment and, most of the time, as Mn

Sparks, Donald L.

190

? Particles Initiate Biological Production of Superoxide Anions and Hydrogen Peroxide in Human Cells  

Science Journals Connector (OSTI)

...induce the cellular production of O2@ and H2O2 by...that the intracel lular production of O2@ and H202 is...18). MATERIALS AND METHODS Reagents. Cells were...concentration, 10 .LM).Hydrogen peroxide (H2O2; 30...intracellular O2@ and H202 production in human cells (19...

P. K. Narayanan; E. H. Goodwin; and B. E. Lehnert

1997-09-15T23:59:59.000Z

191

Age-related comparison of superoxide production by canine neutrophilic polymorphonuclear leukocytes  

E-Print Network [OSTI]

. Academic Press, New York. 31. Hadley, E. C. 1982. Genetic alteration and the pathology of aging, p. 115-136. In R. C. Adelman and G. S. Rath (ed. ), Testing the theories of aging. CRC Press, Boca Raton, Florida. 32. Harmon, D. 1956. Aging: theory based.... Academic Press, New York. 31. Hadley, E. C. 1982. Genetic alteration and the pathology of aging, p. 115-136. In R. C. Adelman and G. S. Rath (ed. ), Testing the theories of aging. CRC Press, Boca Raton, Florida. 32. Harmon, D. 1956. Aging: theory based...

Hanson, Thomas Dale

2012-06-07T23:59:59.000Z

192

E-Print Network 3.0 - anti-superoxide anion radicals Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

radicals Page: << < 1 2 3 4 5 > >> 1 University of Missouri-Columbia Department of Chemistry Summary: the electronic mechanism by which the "super radical stabilizers" does its...

193

E-Print Network 3.0 - alveolar macrophage superoxide Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

alveolar macrophage cytokine production by CD14-independent pathway... ., and Jo Rae Wright. Surfactant protein A inhibits alveolar macrophage cytokine production by...

194

Superoxide Electrochemistry in an Ionic Liquid Inas M. AlNashef, Matthew L. Leonard, Michael A. Matthews,* and  

E-Print Network [OSTI]

, with organic solvents as the reaction medium. Green chemistry and engineering calls for better, sustainable-temperature ionic liquids (RTILs) as substitute solvents in Green chemistry, with the emphasis on organic synthesis dissolved in two different solvent systems: (1) acetonitrile with tetraethylammonium perchlorate (TEAP

Weidner, John W.

195

Pressure Effects on Magneto-Optical Properties in Cadmium Telluride/(Cadmium, Manganese) Telluride Single Quantum Well with High Manganese Concentration  

SciTech Connect (OSTI)

The pressure effect on the magnetic field induced type I-type II transition is studied in a CdTe/Cd1-xMnxTe (x=0.24) single quantum well (SQW). Photoluminescence (PL) measurements under hydrostatic pressures up to 1.07 GPa and long pulsed magnetic fields up to 60 T with a pulse duration of 2 sec are reported. The pressures were generated in a plastic diamond anvil cell (DAC). A bend toward lower energies (additional red shift) is observed above 28.5 T in magnetic field dependence of the exciton energy for a 13 Aring thick quantum well. We attribute this red shift to a phenomenon preceding the type I-type II transition after a comparison with a simple quantum mechanical calculation. The onset field of the additional red shift increases by 3.4 T by applying a pressure of 1.07 GPa. Spin-spin coupling between the exciton and the Mn ion in the interface region is also investigated and found to be enhanced by pressure.

Yokoi, H.; Tozer,S.; Kim, Y.; Rickel, D.; Kakudate, Y.; Usuba, S.; Fujiwara, S.; Takeyama, S.; Karczewski, G.; Wojtowicz, T.; Kossut, J.

1998-11-09T23:59:59.000Z

196

Diane Cabelli  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Diane Cabelli Diane Cabelli Chemist Chemistry Department Building 555 Brookhaven National Laboratory P.O. Box 5000 Upton, NY 11973-5000 Phone: (631) 344-4361 FAX: (631) 344-5815 e-mail Thermal, Photo- and Radiation-Induced Reactions in Condensed Media Research Interests kinetics and mechanisms of high valent metal complex reactivity in water; oxygen radical reactivity with enzymes/cellular components (superoxide dismutases/reductases) Education A.B, Bryn Mawr College; Ph.D., University of Texas at Austin (1979, w/ Michael Dewar/Alan Cowley) Employment National Museum Act Fellowship, Conservation Center, Institute of Fine Arts, New York University 1980-1981; Research Associate, Brookhaven National Laboratory,1981-1983; Assistant Chemist, Brookhaven National Laboratory,1983-1987; Visiting Scientist, Risoe National Laboratory, Denmark, 1985-1986; Associate Chemist, Brookhaven National Laboratory, 1988-1995; Chemist, Brookhaven National Laboratory, 1995-present.

197

Isolation, Characterization, and Hepatoprotective Effects of the Raffinose Family Oligosaccharides from Rehmannia glutinosa Libosch  

Science Journals Connector (OSTI)

RGOs also increased antioxidant levels of hepatic glutathione (GSH), glutathione peroxidase (GSH-Px), superoxide dismutase (SOD), and total antioxidant capacity (T-AOC), and ameliorated the elevated hepatic formation of malonaldehyde (MDA) induced by CCl4 in mice, which coincided with the histological alteration. ... (13-15) Interestingly, R. glutinosa oligosaccharides have been approved as a useful element to promote the proliferation of human adipose-derived mesenchymal stem cells,(16) and have also been shown to be responsible for hypoglycemic effects of R. glutinosa in glucose-induced hyperglycemic and alloxan-induced diabetic rats. ... After the extraction mixture was filtered, the defatted residues were dried in air and further extracted with 10-fold volume of 50% ethanol (1:10, w/v) at 80 °C for 4 h, and this extraction was repeated three times. ...

Ruijun Zhang; Yan Zhao; Yanfei Sun; Xinshan Lu; Xingbin Yang

2013-07-23T23:59:59.000Z

198

Support Information for Kinetic Modeling of Oxidation of Antibacterial Agents by Manganese Oxides  

E-Print Network [OSTI]

obtained by two different quenching methods. TABLE S4. (a) k' and Srxn for triclosan oxidation and (b) k and k: (a)CIP; (b) CDX. FIGURE S4. Effect of MnO2 loading on Srxn and k: (a) Triclosan; (b) CDX. FIGURE) Triclosan OH Cl Cl Cl O 7.99 (1) Chlorophene OH Cl 9.96 (1) 2-Methyl-4-chlorophenol OHCl 9.76 (1) 2

Huang, Ching-Hua

199

Brownleeite: A new manganese silicide mineral in an interplanetary dust particle  

Science Journals Connector (OSTI)

...NASA has been routinely collecting IDPs and has maintained the Cosmic Dust Curatorial Facility (containing a class 10-100 cleanroom) at Johnson Space Center (Warren and Zolensky 1993). The particles described here were individually removed from the collectors...

Keiko Nakamura-Messenger; Lindsay P. Keller; Simon J. Clemett; Scott Messenger; John H. Jones; Russell L. Palma; Robert O. Pepin; Wolfgang Klöck; Michael E. Zolensky; Hirokazu Tatsuoka

200

Cocaine-induced brain activation detected by dynamic manganese-enhanced magnetic resonance imaging (MEMRI)  

Science Journals Connector (OSTI)

...Kong Q Sun S Liu Ch Huang J Xu H ( 2005 ) Internet J Neurol 4 . 36 Lin YJ ( 1997 ) PhD thesis ( Carnegie Mellon University...J. Ross (National Institute on Drug Abuse) and A. C. Silva (National Institutes...Program of the National Institute on Drug Abuse, National Institutes of...

Hanbing Lu; Zheng-Xiong Xi; Leah Gitajn; William Rea; Yihong Yang; Elliot A. Stein

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Surface Chemistry in Chemical Deposition of Manganese-Based Thin Films on Silicon Substrates  

E-Print Network [OSTI]

characteristic   of   metal   carbide   and   organic   (to   fit   the   metal   carbide   and   two   organic  present,  typically   metal   nitrides,   mixed   carbide-­?

Sun, Huaxing

2013-01-01T23:59:59.000Z

202

Diffusion of sodium, potassium, calcium, manganese, and radon in tuff and clinoptilolite under leaching  

Science Journals Connector (OSTI)

Nuclear physics methods are used to determine the diffusion coefficients of Na, Ca, Mn, K, and 222Rn in clinoptilolite (Sokirnitsa occurrence, Ukraine) and in natural tuff (Yucca Mountain, Nevada, United States) ...

N. P. Dikii; A. N. Dovbnya; Yu. V. Lyashko; D. V. Medvedev…

2011-07-01T23:59:59.000Z

203

Removal of Filter Cake Generated by Manganese Tetraoxide Water-based Drilling Fluids  

E-Print Network [OSTI]

Three effective solutions to dissolve the filter cake created by water-based drilling fluids weighted with Mn3O4 particles were developed. Hydrochloric acid at concentration lower than 5 wt% can dissolve most of Mn3O4-based filter cake. Dissolving...

Al Mojil, Abdullah Mohammed A.

2011-10-21T23:59:59.000Z

204

Thermodynamic Investigations of Lithium- and Manganese-Rich Transition Metal Oxides  

Broader source: Energy.gov [DOE]

2013 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting

205

Phase transitions in manganites with substitution of divalent ions for manganese  

Science Journals Connector (OSTI)

Experimental data are presented for the position of phase boundaries “orthorhombic-rhombohedral structure” and “semiconductor-metal” in manganites of La1 ? c + x Sr ...

A. G. Badelin; V. K. Karpasyuk…

2014-02-01T23:59:59.000Z

206

Examining Hysteresis in Lithium- and Manganese-Rich Composite Cathode Materials  

Broader source: Energy.gov [DOE]

2013 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting

207

Molecular Interactions of Plutonium(VI) with Synthetic Manganese-Substituted Goethite  

E-Print Network [OSTI]

WA 99352 Savannah River National Laboratory, Aiken, SCWork at the Savannah River National Laboratory (SRNL) was

Hu, Yung-Jin

2011-01-01T23:59:59.000Z

208

E-Print Network 3.0 - address arsenic manganese Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Department, University of Florida Collection: Environmental Sciences and Ecology ; Environmental Management and Restoration Technologies 2 0268-2605C3802?01191'%0150 Arsenic in...

209

Nucleation of the isothermal martensitic transformation in iron-nickel-manganese alloys  

E-Print Network [OSTI]

By means of quantitative metallography and electrical resistance measurements, the incubation period (time to form a detectable amount of martensite) and the initial nucleation rate have been determined as a function of ...

Pati, Satya Ranjan

1967-01-01T23:59:59.000Z

210

Addressing the Voltage Fade Issue with Lithium-Manganese-Rich Oxide Cathode Materials  

Broader source: Energy.gov [DOE]

2013 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting

211

Synthesis and Characterization of 14-1-11 Ytterbium Manganese Antimonide Derivatives for Thermoelectric Applications  

E-Print Network [OSTI]

have made radioisotope thermoelectric generators (RTGs),Mission Radioisotope Thermoelectric Generator (MMRTG) used

Star, Kurt

2013-01-01T23:59:59.000Z

212

New Environmentally Friendly Dispersants for High Temperature Invert-Emulsion Drilling Fluids Weighted by Manganese Tetraoxide  

E-Print Network [OSTI]

filtration. 3. Specific fluid weight is required to hydrostatically balance formation pressures and to control the well column. The desired fluid density is attained by addition of weighting agents like barite and calcium carbonate. OBMs are water...) minimized drilling problems related to water-sensitive shales. Also, Bennett (1984) mentioned that mineral-oil based invert-emulsion fluids have greater tolerance to the contaminants such as carbonates, hydrogen sulfide, anhydrite, salt, or cement...

Rehman, Abdul

2012-02-14T23:59:59.000Z

213

The Synthesis and Characterization of Substituted Phosphates and Layered Manganese Oxides  

Broader source: Energy.gov [DOE]

2011 DOE Hydrogen and Fuel Cells Program, and Vehicle Technologies Program Annual Merit Review and Peer Evaluation

214

Quantitative room-temperature mineralization of airborne formaldehyde using manganese oxide catalysts  

E-Print Network [OSTI]

Efficiency and Renewable Energy, Building TechnologiesEfficiency and Renewable Energy, Building Technologies

Sidheswaran, Meera A.

2012-01-01T23:59:59.000Z

215

SUPPORTING INFORMATION Growth of Manganese Oxide Nanostructures Alters the Layout of  

E-Print Network [OSTI]

of Squares Mean Square F Value Probability > F Model§ : fmax = apH1 + bpH2 + c 2 0.1116 0.0558 0.96 0 t Value Probability > |t| a 1 0.29 0.10 2.9 0.02 b 1 -0.10 0.08 1.25 0.16 c 1 0.64 0.63 1.01 0.21 F-test and t-test follow standard procedures outlined in Introduction to the Practice of Statistics by Moore

216

Surface Science 419 (1999) 134143 Morphology of ultrathin manganese silicide on Si(111)  

E-Print Network [OSTI]

after room temperature deposition. Mn adsorption and silicide formation of some noble metal precovered epitaxially on Si(111) epitaxial growth of noble metal silicides or refrac- by RHEED (reflection-high-energy electron tory metal silicides have attracted much interest diffraction) and STM (scanning tunneling micro

Hasegawa, Shuji

217

Energetic basis of catalytic activity of layered nanophase calcium manganese oxides for water oxidation  

Science Journals Connector (OSTI)

...and pyrolusite. Am Mineral 97:1291 ZZQQhy1298...Thermodynamic properties of minerals and related substances...compositions of the two mineral oxide phases, reported...direction in this context); green line, mass loss...285.8 ± 0.1 CaO (lime)-635.1 ± 0.9...

Nancy Birkner; Sara Nayeri; Babak Pashaei; Mohammad Mahdi Najafpour; William H. Casey; Alexandra Navrotsky

2013-01-01T23:59:59.000Z

218

The Synthesis and Characterization of Substituted Olivines and Layered Manganese Oxides  

Broader source: Energy.gov [DOE]

2009 DOE Hydrogen Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting, May 18-22, 2009 -- Washington D.C.

219

The Synthesis and Characterization of Substituted Olivines and Layered Manganese Oxides  

Broader source: Energy.gov [DOE]

2010 DOE Vehicle Technologies and Hydrogen Programs Annual Merit Review and Peer Evaluation Meeting, June 7-11, 2010 -- Washington D.C.

220

Electrocatalytic reduction of carbon dioxide to carbon monoxide by rhenium and manganese polypyridyl catalysts  

E-Print Network [OSTI]

are on the decline of the peak oil production curve, and thedue to the impending peak in oil production and the threatoil production curves for those countries that have passed peak

Smieja, Jonathan Mark

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Lithium manganese oxide films fabricated by electron beam directed vapor deposition  

E-Print Network [OSTI]

material for high energy den- sity battery applications.7,8 Lithium­transition metal oxide films can.2. After annealing in air at 700 °C, thin films grown with a low jet speed had a cubic spinel structure Li/Li-ion batteries. © 2008 American Vacuum Society. DOI: 10.1116/1.2823488 I. INTRODUCTION Thin film

Wadley, Haydn

222

Composite Manganese Oxide Percolating Networks As a Suspension Electrode for an Asymmetric Flow Capacitor  

Science Journals Connector (OSTI)

(1, 3-6) Many of these systems adopt several of the key benefits derived from flow battery systems, namely, the ability to obtain both scalable energy and power densities at a lower cost. ... Skyllas-Kazacos, M.; Chakrabarti, M.; Hajimolana, S.; Mjalli, F.; Saleem, M.Progress in Flow Battery Research and Development J. Electrochem. ... Progress in Flow Battery Research and Development ...

Kelsey B. Hatzell; Lei Fan; Majid Beidaghi; Muhammad Boota; Ekaterina Pomerantseva; Emin C. Kumbur; Yury Gogotsi

2014-04-23T23:59:59.000Z

223

Complexation and redox interactions between aqueous plutonium and manganese oxide interfaces  

E-Print Network [OSTI]

thank the members of the Glenn T. Seaborg Center at LBNL forSciences Division, the Glenn T. Seaborg Center, Lawrence

2001-01-01T23:59:59.000Z

224

OXIDATION AND SORPTION KINETICS OF ARSENIC ON A POORLY CRYSTALLINE MANGANESE OXIDE  

E-Print Network [OSTI]

: __________________________________________________________ James T. Sims, Ph.D. Member of dissertation committee #12;iv ACKNOWLEDGMENTS I thank my advisor, Dr Science. I also appreciate Drs. Sims, Hanson and Fuhrman for their insights and advice as I was conducting

Sparks, Donald L.

225

Al2O3 coating for improving thermal stability performance of manganese spinel battery  

Science Journals Connector (OSTI)

The synthesis of Al2O3-coated and uncoated LiMn2O4 by solid-state method and fabrication of LiMn2O4/graphite battery were described. The structure and morphology of the powders were characterized by X-ray diffrac...

Yun-jian Liu ???; Hua-jun Guo ???…

2011-12-01T23:59:59.000Z

226

Nontraditional carbon reducing agents in smelting FMn78B ferromanganese and valuable manganese slag  

SciTech Connect (OSTI)

The smelting of FeMn78B ferromanganese (0.7% P) by a flux-free method, with the production of valuable slag (36-38% Mn), is considered in the case where some of the coke nuts are replaced by anthracite and sometimes by long-flame coal.

P.A. Kravchenko; O.N. Sezonenko; O.L. Bespalov; S.N. Kornienko; S.D. Belikov; M.I. Gasik [OAO Zaporozhskii Zavod Ferrosplavov, Zaporozh'e (Ukraine)

2008-09-15T23:59:59.000Z

227

Electrocatalytic reduction of carbon dioxide to carbon monoxide by rhenium and manganese polypyridyl catalysts  

E-Print Network [OSTI]

graph displays not only the shift in energy from wood to fossil fuels but also shows that total energy usagegraph displays not only the shift in energy from wood to fossil fuels, but also shows that total energy usage

Smieja, Jonathan Mark

2012-01-01T23:59:59.000Z

228

Biochemical and biophysical characterization of the manganese transport regulator (MntR) from Bacillus subtilis  

E-Print Network [OSTI]

a Labconoco Water Pro Plus purification system. Buffers wereby a Labconoco Water Pro Plus purification system. All

Golynskiy, Misha

2007-01-01T23:59:59.000Z

229

Quantitative room-temperature mineralization of airborne formaldehyde using manganese oxide catalysts  

E-Print Network [OSTI]

dish. A 47mm-diameter HVAC filter media specimen was mountedon a typical HVAC particle filter, removed formaldehyde withconditioning (HVAC) particle filter with a thin tackifier

Sidheswaran, Meera A.

2012-01-01T23:59:59.000Z

230

Selective Chemical Vapor Deposition of Manganese Self-Aligned Capping Layer for Cu Interconnections  

E-Print Network [OSTI]

could not be broken apart. This Mn-enhanced binding strength of Cu to insulators is observed for all and nitrides. An adhesive tape is usually sufficient to remove copper films from these surfaces. Quantitative reliability because cobalt on the dielectric can increase leakage and lower the breakdown voltage.4 Cobalt

231

Synthesis and Characterization of 14-1-11 Ytterbium Manganese Antimonide Derivatives for Thermoelectric Applications  

E-Print Network [OSTI]

for remote impoverished communities. [1] For heat rejection,heat generated by a decaying radioisotope to electrical power, well suited for deep space exploration as well as use in remote

Star, Kurt

2013-01-01T23:59:59.000Z

232

Electrocatalytic reduction of carbon dioxide to carbon monoxide by rhenium and manganese polypyridyl catalysts  

E-Print Network [OSTI]

compressed air and hydrogen production are all frequently discussed as viable options for future energy storage.

Smieja, Jonathan Mark

2012-01-01T23:59:59.000Z

233

Manganese Nodules, Topography and Thickness of Quaternary Sediments in the Central Pacific  

Science Journals Connector (OSTI)

... in the properties of deep sea sediments, and to try to relate these variations to processes of pelagic sedimentation. To facilitate such an investigation, we chose an area within the ... -40). Values of P have been corrected for the effects of multiple tests on interrelated sets of data.

T. C. MOORE; G. R. HEATH

1966-12-03T23:59:59.000Z

234

The spectroscopic characterization of the sulphate mineral ettringite from Kuruman manganese deposits, South Africa  

Science Journals Connector (OSTI)

Abstract The mineral ettringite has been studied using a number of techniques, including XRD, SEM with EDX, thermogravimetry and vibrational spectroscopy. The mineral proved to be composed of 53% of ettringite and 47% of thaumasite in a solid solution. Thermogravimetry shows a mass loss of 46.2% up to 1000 °C. Raman spectroscopy identifies multiple sulphate symmetric stretching modes in line with the three sulphate crystallographically different sites. Raman spectroscopy also identifies a band at 1072 cm?1 attributed to a carbonate symmetric stretching mode, confirming the presence of thaumasite. The observation of multiple bands in the ?4 spectral region between 700 and 550 cm?1 offers evidence for the reduction in symmetry of the sulphate anion from Td to \\{C2v\\} or even lower symmetry. The Raman band at 3629 cm?1 is assigned to the OH unit stretching vibration and the broad feature at around 3487 cm?1 to water stretching bands. Vibrational spectroscopy enables an assessment of the molecular structure of natural ettringite to be made.

Ray L. Frost; Andrés López; Yunfei Xi; Ricardo Scholz; Geraldo Magela da Costa; Rosa Malena Fernandes Lima; Amanda Granja

2013-01-01T23:59:59.000Z

235

Defect-Induced Photoconductivity in Layered Manganese Oxides: A Density Functional Theory Study  

E-Print Network [OSTI]

of plane-wave electronic structure calculations of bulkprinciples calculations of the electronic structure and

Kwon, K.D.; Refson, K.; Sposito, G.

2008-01-01T23:59:59.000Z

236

Tolerance to manganese toxicity among cultivars of lucerne (Medicago sativa L.)  

Science Journals Connector (OSTI)

Two sand culture experiments were carried out to identify commercial cultivars of lucerne or alfalfa (Medicago sativa L.) which contain elite, Mn-tolerant plants for use in a selection programme to increase the a...

P. W. G. Sale; D. I. Couper; P. L. Cachia…

1993-01-01T23:59:59.000Z

237

Tolerance to manganese toxicity among cultivars of lucerne (Medicago sativa L.)  

Science Journals Connector (OSTI)

Two sand culture experiments were carried out to identify commercial cultivars of lucerne or alfalfa (Medicago sativa L.) which contain elite, Mn-tolerant plants for use in a selection programme to increase the a...

P. W. G. Sale; D. I. Couper; P. L. Cachia; P. J. Larkin

1992-10-01T23:59:59.000Z

238

AN X-RAY ABSORPTION SPECTROSCOPY STUDY OF MANGANESE CONTAINING COMPOUNDS AND PHOTOSYNTHETIC SPINACH CHLOROPLASTS  

E-Print Network [OSTI]

II. Extended X-ray Absorption Fine Structure (EXAFS) TheoryIII. X-ray Absorption Spectroscopy (XAS) ExperimentIII. EXTENDED X-RAY ABSORPTION FINE STRUCTURE (EXAFS) DATA

Kirby, Jon Allan

2012-01-01T23:59:59.000Z

239

Control of cryogenic intergranular fracture in high-manganese austenitic steels  

SciTech Connect (OSTI)

The sources of cryogenic intergranular embrittlement in high-Mn austenitic steels and the conditions necessary for its control are examined. It is shown that the high-Mn alloys are inherently susceptible to intergranular embrittlement due to both their low grain boundary cohesion and heterogeneous deformation characteristics. Extrinsic sources of embrittlement which could account for the transition behavior are not observed. An Auger electron spectroscopy (AES) study shows no indication of impurity-segregation-induced embrittlement. No grain boundary precipitation is observed, and austenite stabilization does not ensure ductile fracture. The influence of chemistry modifications on the ductile-to-brittle transition behavior were also examined through additions of N, Cr, and C to binary Fe-31 Mn. Nitrogen additions increase the 77K yield strength at a rate of 2200 MPa per weight percent N, and increase the austenite stability, but also increase the susceptibility of ternary alloys to intergranular fracture. Quaternary Cr additions are effective in increasing the N solubility, and lower the transition temperature. Carbon additions result in complete suppression of intergranular fracture at 77K. Qualitatively significant changes in the deformation heterogeneity with chemistry modifications are not observed. The temper-toughening of Fe-Mn-Cr-N alloys is associated with the grain boundary segregation of boron and the redistribution of N. Both boron and carbon are expected to inhibit intergranular fracture through increases in grain boundary cohesion.

Strum, M.J.

1986-12-01T23:59:59.000Z

240

Saneroite: chemical and structural variations of manganese pyroxenoids with hydrogen bonding in the silicate chain  

Science Journals Connector (OSTI)

...1.623(3) 1.628 9 5 Babingtonite 1.616(2)-1.620...1972): Crystal structure of babingtonite. Z. Kristallogr. , 135...distribution in Mg, Mn-bearing babingtonite from Arvigo, Val Valanca...1984): Evaluation of the use of Gaussian (rhoz) curves...

Mariko Nagashima; Thomas Armbruster

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

THE MECHANICAL PROPERTIES AND MICROSTRUCTURAL RELATIONSHIPS IN IRON-MANGANESE-CHROMIUM ALLOYS  

E-Print Network [OSTI]

Heat Treatment . . . Mechanical Testing E. F. G. TensileEXPERIHENTAL RESULTS A. Mechanical Properties Tensilein B. Alloys Sigma Phase Mechanical Property Evaluation 14:

Thompson, L.D.

2010-01-01T23:59:59.000Z

242

Improving the Performance of Lithium Manganese Phosphate Through Divalent Cation Substitution  

E-Print Network [OSTI]

2003). J. Barker, M . Y . Saidi and T. E. Kelley, US PatentTechnology, Inc. ). M . Y . Saidi and H . Huang, US Patent

Chen, Guoying

2010-01-01T23:59:59.000Z

243

Reaction of Plutonium(VI) with the Manganese-Substituted Iron Oxide Mineral Goethite.  

E-Print Network [OSTI]

??More than 60 years of nuclear power and weapons production in the United States has left this country with a large burden of radioactive legacy… (more)

Hu, Yung-Jin Hu

2011-01-01T23:59:59.000Z

244

Promises and Challenges of Lithium- and Manganese-Rich Transition-Metal Layered-Oxide Cathodes  

Broader source: Energy.gov [DOE]

2013 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting

245

Addressing the Voltage Fade Issue with Lithium-Manganese-Rich Oxide Cathode Materials  

Broader source: Energy.gov [DOE]

2012 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting

246

E-Print Network 3.0 - arsenic manganese uranium Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

IN-SITU LEACHIN-SITU RECOVERY (ISLISR) SITES Radiation Protection Division Office... .1 Uranium Geology......

247

Global Regulation of Virulence Determinants During Plant Colonization in the Bacterial Phytopathogen, Pantoea stewartii subsp. stewartii  

E-Print Network [OSTI]

Induction of peroxide and superoxide protective enzymes and physiological cross-protection against peroxide killing by a superoxide generator

Burbank, Lindsey

2014-01-01T23:59:59.000Z

248

Probing The Electrode/Electrolyte Interface in The Lithium Excess Layered Oxide Li1.2Ni0.2Mn0.6O2  

SciTech Connect (OSTI)

A detailed surface investigation of the lithium-excess nickel manganese layered oxide Li1.2Ni0.2Mn0.6O2 structure was carried out using x-ray photoelectron spectroscopy (XPS), total electron yield and transmission x-ray absorption spectroscopy (XAS), and electron energy loss spectroscopy (EELS) during the first two electrochemical cycles. All spectroscopy techniques consistently showed the presence of Mn4+ in the pristine material and a surprising reduction of Mn at the voltage plateau during the first charge. The Mn reduction is accompanied by the oxygen loss revealed by EELS. Upon the first discharge, the Mn at the surface never fully returns back to Mn4+. The electrode/electrolyte interface of this compound consists of the reduced Mn at the crystalline defect-spinel inner layer and an oxidized Mn species simultaneously with the presence of a superoxide species in amorphous outer layer. This proposed model signifies that oxygen vacancy formation and lithium removal result in electrolyte decomposition and superoxide formation, leading to Mn activation/dissolution and surface layer-spinel phase transformation. The results also indicate that the role of oxygen is complex and significant in contributing to the extra capacity of this class of high energy density cathode materials.

Carroll, Kyler J [University of California, San Diego; Qian, Danna [University of California, San Diego; Fell, Chris [University of Florida, Gainesville; Calvin, Scott [Sarah Lawrence College; Veith, Gabriel M [ORNL; Chi, Miaofang [ORNL; Dudney, Nancy J [ORNL; Meng, Ying Shirley [University of California, San Diego

2013-01-01T23:59:59.000Z

249

Inactivation of Escherichia coli by Polychromatic Simulated Sunlight: Evidence for and Implications of a Fenton Mechanism Involving Iron, Hydrogen Peroxide, and Superoxide  

Science Journals Connector (OSTI)

...Voelker. 2008. Speeding up solar disinfection (SODIS): effects...additional hydrogen peroxide on solar water disinfection. Massachusetts Institute of Technology, Cambridge...2010. Dramatic enhancement of solar disinfection (SODIS) of wild...

Michael B. Fisher; Kara L. Nelson

2013-11-22T23:59:59.000Z

250

Diminished Superoxide Generation Is Associated With Respiratory Chain Dysfunction and Changes in the Mitochondrial Proteome of Sensory Neurons From Diabetic Rats  

E-Print Network [OSTI]

with aberrant mitochondrial respi- ratory chain physiology and function. Under high glucose concentration, the neuron cell body perceives that mito- chondrial function can be downgraded; however, this may ignore the unique high-energy requirements of the nerve...

Akude, Eli; Zherebitskaya, Elena; Chowdhury, Subir K. Roy; Smith, Darrell R.; Dobrowsky, Rick T.; Fernyhough, Paul

2011-09-28T23:59:59.000Z

251

Production and field performance of transgenic alfalfa (Medicago sativa L.) expressing alpha-amylase and manganese-dependent lignin peroxidase  

Science Journals Connector (OSTI)

Transgenic alfalfa plants expressinBacillus licheniformis alpha-amylase and mangaese-dependent lignin peroxidase (Mn-P...Phanerochaete chrysosporium were produced using the Agrobacterium tumefaciens...transformat...

S. Austin; E. T. Bingham; D. E. Mathews; M. N. Shahan; J. Will; R. R. Burgess

1995-02-01T23:59:59.000Z

252

Initial Steps of Photosystem II de Novo Assembly and Preloading with Manganese Take Place in Biogenesis Centers in Synechocystis  

Science Journals Connector (OSTI)

...and respiratory electron transfer chain...analysis after dialysis against 10 mM...double-distilled water. Samples were...Morgagni 268 electron microscope...followed by treatment with the gold-labeled...embedding medium for electron microscopy...Photoactivation of the water-oxidizing complex...

Anna Stengel; Irene L. Gügel; Daniel Hilger; Birgit Rengstl; Heinrich Jung; Jörg Nickelsen

2012-02-07T23:59:59.000Z

253

UNIVERSITY OF CALIFORNIA, SAN DIEGO Microbial Manganese(II) Oxidation: Biogeochemistry of a Deep-Sea Hydrothermal  

E-Print Network [OSTI]

.2. Control dMn removal experiments 64 Table 3.3. Effects of copper additions on dMn Removal 65 Table 4 counts of Mn(II)-oxidizing bacteria 33 Table 3.1. Summary of dMn removal rate measurements 63 Table 3Mn removal rates in Guaymas Basin and Carmen Basin 67 Figure 3.3. Time course of dMn removal 68 Figure 3

Dick, Christopher

254

Real-time x-ray absorption spectroscopy of uranium, iron, and manganese in contaminated sediments during bioreduction  

E-Print Network [OSTI]

National Laboratory, Berkeley, California 94720 University of Chicago, Chicago, Illinois 60637 Savannah River

Tokunaga, T.K.

2008-01-01T23:59:59.000Z

255

Examination of oxygen uncoupling behaviour and reactivity towards methane for manganese silicate oxygen carriers in chemical-looping combustion  

Science Journals Connector (OSTI)

Abstract Cheap and environmental friendly Mn–Si oxygen carriers manufactured from Mn3O4 and SiO2 by spray-drying have been investigated with respect to properties for chemical-looping combustion (CLC) and chemical-looping with oxygen uncoupling (CLOU). Fifteen oxygen carriers with SiO2 content varying from 2 wt% to 75 wt% were prepared and calcined at 1050 °C and 1150 °C. The ability of material to release O2 and their reactivity towards CH4 were examined in the temperature range 900–1100 °C. Particles with a SiO2 content of more than 45 wt% and calcined at 1150 °C showed limited CLOU behaviour and poor reactivity towards CH4 at all temperatures investigated. The rest of the materials had significant CLOU properties and provided high conversion of CH4 under the experimental conditions chosen. Increasing the temperature of operation enhanced the CLOU behaviour and reactivity towards CH4. At temperatures above 950 °C, the CH4 conversion was 90–100% for these materials. Crystalline phases identified by XRD in the oxidized samples with more than 45 wt% SiO2 and calcined at 1150 °C were mainly rhodonite MnSiO3. For materials with SiO2 content below 45 wt%, braunite Mn7SiO12 was detected as the main phase in most of the samples after oxidation. This indicates that braunite Mn7SiO12 is the main active phase for oxygen transfer in CLC and CLOU, which is supported by thermodynamic calculations. The reactivity of all of the materials were also studied with syngas (50% CO and 50% H2), showing complete gas conversion at 950 °C, except for materials with a SiO2 content of more than 45 wt% and calcined at 1150 °C. The mechanical integrity and attrition resistance of the oxygen carriers were examined in a jet-cup attrition rig, and although the attrition rates varied, some reactive material showed low rates of attrition, making them very promising oxygen carrier materials for applications related to CLC and CLOU. However, measures should probably be taken to improve the crushing strength to some extent.

Dazheng Jing; Mehdi Arjmand; Tobias Mattisson; Magnus Rydén; Frans Snijkers; Henrik Leion; Anders Lyngfelt

2014-01-01T23:59:59.000Z

256

Thickness Dependence of Oxygen Reduction Reaction Kinetics on Strontium-Substituted Lanthanum Manganese Perovskite Thin-Film Microelectrodes  

E-Print Network [OSTI]

Oxygen reduction reaction (ORR) kinetics was investigated on dense La?.?Sr?.?MnO? microelectrodes as a function of temperature and microelectrode thickness using electrochemical impedance spectroscopy. The surface oxygen ...

la O’, G. J.

257

Real-time x-ray absorption spectroscopy of uranium, iron, and manganese in contaminated sediments during bioreduction  

E-Print Network [OSTI]

ferric iron in aquatic sediments. Applied and Environmentalin evaporation basin sediments. Geochimica Cosmochimica Actaof uranium-contaminated subsurface sediments. Environmental

Tokunaga, T.K.

2008-01-01T23:59:59.000Z

258

A Spin Topological Model for the g ) 4.1 S2 State Photosystem II Water Oxidase Manganese Aggregate  

E-Print Network [OSTI]

ReceiVed NoVember 30, 1998 The oxygen-evolving complex (OEC) of photosystem II (PSII) catalyzes*, Departments of Chemistry Eugene F. Merkert Chemistry Center, Boston College Chestnut Hill, Massachusetts 02167 photosynthetic oxidation of water to molecular oxygen. Although the precise structure of the OEC is unknown

Hendrich, Mike

259

Surface Complexation of Pb(II) on Amorphous Iron Oxide and Manganese Oxide: Spectroscopic and Time Studies  

SciTech Connect (OSTI)

Hydrous Fe and Mn oxides (HFO and HMO) are important sinks for heavy metals and Pb(II) is one of the more prevalent metal contaminants in the environment. In this work, Pb(II) sorption to HFO (Fe{sub 2}O{sub 3}{center_dot}nH{sub 2}O, n=1-3) and HMO (MnO{sub 2}) surfaces has been studied with EXAFS: mononuclear bidentate surface complexes were observed on FeO{sub 6} (MnO{sub 6}) octahedra with Pb{single_bond}O distance of 2.25-2.35 Angstroms and Pb{single_bond}Fe(Mn) distances of 3.29-3.36 (3.65-3.76) Angstroms. These surface complexes were invariant of pH 5 and 6, ionic strength 2.8x10{sup -3} to 1.5x10{sup -2}, loading 2.03x10{sup -4} to 9.1 x 10{sup -3} mol Pb/g, and reaction time up to 21 months. EXAFS data at the Fe K-edge revealed that freshly precipitated HFO exhibits short-range order; the sorbed Pb(II) ions do not substitute for Fe but may inhibit crystallization of HFO. Pb(II) sorbed to HFO through a rapid initial uptake ({approx}77%) followed by a slow intraparticle diffusion step ({approx}23%) resulting in a surface diffusivity of 2.5x10{sup -15} cm{sup 2}/s. Results from this study suggest that mechanistic investigations provide a solid basis for successful adsorption modeling and that inclusion of intraparticle surface diffusion may lead to improved geochemical transport depiction.

Xu,Y.; Boonfueng, T.; Axe, L.; Maeng, S.; Tyson, T.

2006-01-01T23:59:59.000Z

260

High-temperature X-ray diffraction study of crystallization and phase segregation on spinel-type lithium manganese oxides  

SciTech Connect (OSTI)

To study crystallization process of spinel-type Li{sub 1+x}Mn{sub 2-x}O{sub 4}, in-situ high-temperature X-ray diffraction technique (HT-XRD) was utilized for the mixture consisting of Li{sub 2}CO{sub 3} and Mn{sub 2}O{sub 3} as starting material in the temperature range of 25-700 deg. C. In-situ HT-XRD analysis directly revealed that crystallization process of Li{sub 1+x}Mn{sub 2-x}O{sub 4} was significantly affected by the difference in the Li/Mn molar ratio in the precursor. Single phase of stoichiometric LiMn{sub 2}O{sub 4} formed at 700 deg. C. The formation of single phase of spinel was achieved at the lower temperature than the stoichiometric sample as Li/Mn molar ratio in the precursor increased. Lattice parameter of the stoichiometric LiMn{sub 2}O{sub 4} at 25 deg. C was 8.24 A and expanded to 8.31 A at 700 deg. C, which corresponds to the approximately 3% expansion in the unit cell volume. From the slope of the lattice parameter change as a function of temperatures, linear thermal expansion coefficient of the stoichiometric LiMn{sub 2}O{sub 4} was calculated to be 1.2x10{sup -5} deg. C{sup -1} in this temperature range. When the Li/Mn molar ratio in Li{sub 1+x}Mn{sub 2-x}O{sub 4} increased (x > 0.1), the spinel phase segregated into the Li{sub 1+y}Mn{sub 2-y}O{sub 4} (x > y) and Li{sub 2}MnO{sub 3} during heating, which involved the oxygen loss from the materials. During the cooling process from 700 deg. C, and the segregated phase merged into Li{sub 1+x}Mn{sub 2-x}O{sub 4} with oxygen incorporation. Such trend directly observed by in-situ HT-XRD was supported by thermal gravimetric analysis as reversible weight (oxygen) loss/gain at higher temperature (500-700 deg. C). - Graphical abstract: Non-linear variation of lattice parameters of the Li excess LiMn{sub 2}O{sub 4} spinels was observed during cooling process from 700 to 25 deg. C.

Komaba, Shinichi, E-mail: komaba@rs.kagu.tus.ac.j [Department of Applied Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601 (Japan); Yabuuchi, Naoaki; Ikemoto, Sachi [Department of Applied Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601 (Japan)

2010-01-15T23:59:59.000Z

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Initial Steps of Photosystem II de Novo Assembly and Preloading with Manganese Take Place in Biogenesis Centers in Synechocystis  

Science Journals Connector (OSTI)

...performed in triplicate. Data analysis was performed...3.162 mW (microwave power), 100 kHz (modulation...of rPratA in solution. Data were analyzed by plotting...PratA was calculated. Data were analyzed by plotting...incubation with 50 muL 2 Roti-Load 1 (Roth) for 5 min at...

Anna Stengel; Irene L. Gügel; Daniel Hilger; Birgit Rengstl; Heinrich Jung; Jörg Nickelsen

2012-02-07T23:59:59.000Z

262

Selective adsorption of manganese onto cobalt for optimized Mn/Co/TiO2 FischerTropsch catalysts  

E-Print Network [OSTI]

, Debye Institute for Nanomaterials Science, Utrecht University, Sorbonnelaan 16, 3584 CA Utrecht Adsorption (SEA) method was applied to the rational design of a promoted Co catalyst for Fischer­Tropsch (FT (SEA) method, which has been successfully applied to prepare highly dis- persed, monometallic catalysts

Regalbuto, John R.

263

Selenium induced lipid peroxidation in heart tissues of chick embryos  

SciTech Connect (OSTI)

During the past three decades research has been carried out to elucidate the role of free radicals and reactive oxygen species play in various pathophysiological processes. Membranes of subcellular organelles contain relatively high concentrations of polyunsaturated lipids as well as hemoproteins which are strong catalysts of lipid peroxidation. Lipid peroxides (LPO) destroy membrane integrity and decrease membrane fluidity and elasticity. Selenium is known both as an important essential trace element and an environmental pollutant. Selenium has many uses in the industries. The main source of selenium for the mammalian organism is food (from the soil into the vegetables and grain) and to a lesser extent, drinking water. A number of syndromes of selenium toxicity in animals have been described. Selenium is regarded as the most important biological antioxidant. The antioxidant function of selenium is linked to the activity of seleno enzyme glutathione peroxidase (GPx), which catalyses the reduction of hydroperoxides. The antioxidant enzymes like superoxide dismutase (SOD) reduce superoxide radicals to H[sub 2]O[sub 2] which inturn is preferential oxidation of glutathione by peroxides is catalysed by GPx. The oxidized glutathione is then reduced by glutathione reductase (GR) and maintains the reduced glutathione levels in the system in a cyclic manner. Further, glutathione transferase (GST) catalyses the transformation of a wide variety of electrophilic compounds to less toxic compounds by conjugating them to GSH. The present study evaluated the biochemical basis of selenium induced lipid peroxidative damage to heart tissues in check embryos and the role of antioxidant enzymes like GPx, GST, GR, SOD and CAT. 24 refs., 2 figs., 2 tabs.

Padmaja, K.; Somasekharaiah, B.V.; Prasad, A.R.K. (S.V. Univ., Tirupati (India))

1993-09-01T23:59:59.000Z

264

Molecular dissection of the roles of the SOD genes in mammalian response to low dose irradiation  

SciTech Connect (OSTI)

It has been long recognized that a significant fraction of the radiation-induced genetic damage to cells are caused by secondary oxidative species. Internal cellular defense systems against oxidative stress play significant roles in countering genetic damage induced by ionizing radiation. The role of the detoxifying enzymes may be even more prominent in the case of low-dose, low-LET irradiation, as the majority of genetic damage may be caused by secondary oxidative species. In this study we have attempted to decipher the roles of the superoxide dismutase (SOD) genes, which are responsible for detoxifying the superoxide anions. We used adenovirus vectors to deliver RNA interference (RNAi or siRNA) technology to down-regulate the expression levels of the SOD genes. We have also over-expressed the SOD genes by use of recombinant adenovirus vectors. Cells infected with the vectors were then subjected to low dose ?-irradiation. Total RNA were extracted from the exposed cells and the expression of 9000 genes were profiled by use of cDNA microarrays. The result showed that low dose radiation had clear effects on gene expression in HCT116 cells. Both over-expression and down-regulation of the SOD1 gene can change the expression profiles of sub-groups of genes. Close to 200 of the 9000 genes examined showed over two-fold difference in expression under various conditions. Genes with changed expression pattern belong to many categories that include: early growth response, DNA-repair, ion transport, apoptosis, and cytokine response.

Eric Y. Chuang

2006-08-31T23:59:59.000Z

265

Multiple sclerosis and interferon  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Multiple sclerosis and interferon Multiple sclerosis and interferon Name: iguanajoe Status: N/A Age: N/A Location: N/A Country: N/A Date: Around 1993 Question: I have recently read that interferon is being used as a treatment for multiple sclerosis. Please explain how it affects the nerve tissue and how effective it is. Replies: Interferon is a cell to cell chemical messenger which essentially protects cells from viruses. That is, when a virus infects a cell, it sends out interferon, which is received by neighboring cells. A biochemical reaction then follows which builds the cells resistance viruses, and hopefully, it will be enough to prevent the virus from spreading. If there is work with interferon and MS, perhaps some researchers believe that MS is caused by a viral infection that destroys nervous tissue. r, that viruses cause some genetic mutation which compromises the maintenance of healthy nervous tissue. By the way, the genetic cause for another muscular-nervous disorder, Lou Gherigs Disease or ALS, was recently found to be a hereditary genetic disorder. People susceptible to ALS did not have a gene which codes for a certain superoxide dismutase antioxidant enzyme, necessary to maintain healthy nervous tissue and prevent it from free radical destruction. Maybe the cause of MS is similar.

266

Effects of phenanthrene on seed germination and some physiological activities of wheat seedling  

Science Journals Connector (OSTI)

Abstract Polycyclic aromatic hydrocarbons (PAHs) are one of the highly persistent organic pollutants, and they are toxic to plants and other living organisms, including human beings. To analyze the response of higher plant to PAHs, we investigated the effects of phenanthrene (PHE) on seed germination and various physiological changes of wheat seedlings. Specifically, we investigated growth, chlorophyll content, lipid peroxidation (LPO), activities of antioxidant enzymes and H2O2 accumulation. The results showed that PHE inhibited seed germination, affected the growth and chlorophyll level of wheat seedlings. Furthermore, PHE elevated the levels of LPO and induced H2O2 accumulation in leaf tissues in a dose-dependent manner, accompanied by the changes in the antioxidant status. The activities of antioxidant enzymes, including superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX), displayed a decreasing trend with the increasing of PHE concentration. The results indicated that PHE could exert oxidative damages in the early development stage of wheat and the harmfulness occurred mainly in samples with higher concentrations of PHE.

Haiying Wei; Shanjuan Song; Hongling Tian; Ting Liu

2014-01-01T23:59:59.000Z

267

Reduction in (pro-)inflammatory responses of lung cells exposed in vitro to diesel exhaust treated with a non-catalyzed diesel particle filter  

Science Journals Connector (OSTI)

Abstract Increasingly stringent regulation of particulate matter emissions from diesel vehicles has led to the widespread use of diesel particle filters (DPFs), the effect of which on exhaust toxicity is so far poorly understood. We exposed a cellular model of the human respiratory epithelium at the air-liquid interface to non-catalyzed wall-flow DPF-filtered diesel exhaust and compared the resulting biological responses to the ones observed upon exposure to unfiltered exhaust. Filtered diesel exhaust acted highly oxidative, even though to a lesser extent than unfiltered exhaust (quantification of total reduced glutathione), and both exhaust types triggered comparable responses to oxidative stress (measurement of heme-oxygenase 1 (HMOX1) and superoxide-dismutase (SOD1) gene expression). Further, diesel exhaust filtration significantly reduced pro-inflammatory responses (measurement of tumor necrosis factor (TNF) and interleukin-8 (IL-8) gene expression and quantification of the secretion of their gene products TNF-? and IL-8). Because inflammatory processes are central to the onset of adverse respiratory health effects caused by diesel exhaust inhalation, our results imply that \\{DPFs\\} may make a valuable contribution to the detoxification of diesel vehicle emissions. The induction of significant oxidative stress by filtered diesel exhaust however, also implies that the non-particulate exhaust components also need to be considered for lung cell risk assessment.

Sandro Steiner; Jan Czerwinski; Pierre Comte; Loretta L. Müller; Norbert V. Heeb; Andreas Mayer; Alke Petri-Fink; Barbara Rothen-Rutishauser

2013-01-01T23:59:59.000Z

268

Effects of Dietary Selenomethionine Supplementation on Growth Performance, Meat Quality and Antioxidant Property in Yellow Broilers  

Science Journals Connector (OSTI)

In plasma, supplemental Se-Met at 0.225 mg/kg level increased total antioxidant capability (T-AOC), glutathione peroxidase (GPX), total superoxide dismutase (T-SOD), catalase (CAT) activities, glutathione (GSH) concentration (p < 0.05), and decreased malondialdehyde production (p < 0.05), compared with the control and broilers fed SS diet. ... Supplied per kilogram of diet: vitamin A (trans-retinyl acetate), 1500 IU; vitamin D3, 200 IU; vitamin E (dl-?-tocopherol acetate), 10 IU; vitamin K3, 0.5 mg; riboflavin, 3.6 mg; niacin, 30 mg; pantothenic acid, 10 mg; 50% cholinechloride, 800 mg; cobalamin, 10 ?g; biotin, 0.15 mg; folic acid, 0.55 mg; FeSO4·7H2O, 300 mg; MnO, 100 mg; CuSO4·5H2O, 20 mg; ZnSO4·H2O, 150 mg; NaSeO3, 0.15 mg; KI, 0.5 mg; ethoxyquin, 100 mg; avoparcin, 15 mg. ...

Zongyong Jiang; Yingcai Lin; Guilian Zhou; Lihuan Luo; Shouqun Jiang; Fang Chen

2009-10-06T23:59:59.000Z

269

Fenofibrate down-regulates the expressions of androgen receptor (AR) and AR target genes and induces oxidative stress in the prostate cancer cell line LNCaP  

SciTech Connect (OSTI)

Highlights: ? Fenofibrate induces cell cycle arrest in G1 phase and apoptosis in LNCaP cells. ? Fenofibrate reduces the expressions of androgen receptor in LNCaP cells. ? Fenofibrate induces oxidative stress in the prostate cancer cell line LNCaP. -- Abstract: Fenofibrate, a peroxisome proliferator-androgen receptor-alpha agonist, is widely used in treating different forms of hyperlipidemia and hypercholesterolemia. Recent reports have indicated that fenofibrate exerts anti-proliferative and pro-apoptotic properties. This study aims to investigate the effects of fenofibrate on the prostate cancer (PCa) cell line LNCaP. The effects of fenofibrate on LNCaP cells were evaluated by flow cytometry, reverse transcription-polymerase chain reaction, enzyme-linked immunosorbent assays, Western blot analysis, and dual-luciferase reporter assay. Fenofibrate induces cell cycle arrest in G1 phase and apoptosis in LNCaP cells, reduces the expressions of androgen receptor (AR) and AR target genes (prostate-specific antigen and TMPRSS2), and inhibits Akt phosphorylation. Fenofibrate can induce the accumulation of intracellular reactive oxygen species and malondialdehyde, and decrease the activities of total anti-oxidant and superoxide dismutase in LNCaP cells. Fenofibrate exerts an anti-proliferative property by inhibiting the expression of AR and induces apoptosis by causing oxidative stress. Therefore, our data suggest fenofibrate may have beneficial effects in fenofibrate users by preventing prostate cancer growth through inhibition of androgen activation and expression.

Zhao, Hu; Zhu, Chen; Qin, Chao [State Key Laboratory of Reproductive Medicine, Department of Urology, First Affiliated Hospital of Nanjing Medical University, Nanjing (China)] [State Key Laboratory of Reproductive Medicine, Department of Urology, First Affiliated Hospital of Nanjing Medical University, Nanjing (China); Tao, Tao [Department of Neurosurgery, First Affiliated Hospital of Nanjing Medical University, Nanjing (China)] [Department of Neurosurgery, First Affiliated Hospital of Nanjing Medical University, Nanjing (China); Li, Jie; Cheng, Gong; Li, Pu; Cao, Qiang; Meng, Xiaoxin; Ju, Xiaobing; Shao, Pengfei; Hua, Lixin [State Key Laboratory of Reproductive Medicine, Department of Urology, First Affiliated Hospital of Nanjing Medical University, Nanjing (China)] [State Key Laboratory of Reproductive Medicine, Department of Urology, First Affiliated Hospital of Nanjing Medical University, Nanjing (China); Gu, Min, E-mail: medzhao1980@163.com [State Key Laboratory of Reproductive Medicine, Department of Urology, First Affiliated Hospital of Nanjing Medical University, Nanjing (China)] [State Key Laboratory of Reproductive Medicine, Department of Urology, First Affiliated Hospital of Nanjing Medical University, Nanjing (China); Yin, Changjun, E-mail: drcjyin@gmail.com [State Key Laboratory of Reproductive Medicine, Department of Urology, First Affiliated Hospital of Nanjing Medical University, Nanjing (China)] [State Key Laboratory of Reproductive Medicine, Department of Urology, First Affiliated Hospital of Nanjing Medical University, Nanjing (China)

2013-03-08T23:59:59.000Z

270

Effects of heat and radiation on mammalian cells  

Science Journals Connector (OSTI)

Although it is tempting to interpret the actions of heat on living cells as a way of oxidative stress, the well known naturally occuring antioxidant systems (reduced glutathione, superoxide dismutase, catalase and glutathione peroxidase) are not found to act as the main protective systems of the cell against hyperthermic cell killing. Evidence is presented that it is not the lipids of the membrane, but probably the membrane proteins which are critical primary molecular targets for hyperthermia. The readily peroxidizable polyunsaturated fatty acyl (PUFA) chains of phospholipids may be target molecules for radiation damage leading to interphase death but not leading to reproductive death. Repair of radiation-induced DNA lesions is probably the critical event in cell survival after radiation. This process is inhibited by hyperthermia. The synergism observed as a consequence of the interaction of heat and radiation may not always be explained by the rate of repair of DNA breaks. Especially in the case of fractioned heat treatments (inducing a state of thermotolerance) the situation seems more complicated. Heat-induced inactivation of DNA repair enzymes as well as heat-induced structural changes in chromatin (enhanced protein binding) may be processes that become critical. Thermotolerance does not always interfere with the process of heat radiosensitization.

A.W.T. Konings

1987-01-01T23:59:59.000Z

271

Physiological and biochemical responses of three Veneridae clams exposed to salinity changes  

Science Journals Connector (OSTI)

Abstract Given their global importance, coastal marine environments are a major focus of concern regarding the potential impacts of climate change, namely due to alterations in seawater salinity. It is known that environmental characteristics, such as salinity, affect immune and physiological parameters of bivalves. Nevertheless, scarce information is available concerning the biochemical alterations associated with salinity changes. For this reason, the present work aimed to evaluate the biochemical responses of three venerid clam species (Venerupis decussata, Venerupis corrugata, Venerupis philippinarum) submitted to salinity changes. The effects on the native (V. decussata and V. corrugata) and invasive (V. philippinarum) species collected from the same sampling site and submitted to the same salinity gradient (0 to 42 g/L) were compared. The results obtained demonstrated that V. corrugata is the most sensitive species to salinity changes and V. decussata is the species that can tolerate a wider range of salinities. Furthermore, our work showed that clams under salinity associated stress can alter their biochemical mechanisms, such as increasing their antioxidant defenses, to cope with the higher oxidative stress resulting from hypo and hypersaline conditions. Among the physiological and biochemical parameters analyzed (glycogen and protein content; lipid peroxidation levels, antioxidant enzymes activity; total, reduced and oxidized glutathione) Catalase (CAT) and especially superoxide dismutase (SOD) showed to be useful biomarkers to assess salinity impacts in clams.

Vanessa Carregosa; Cátia Velez; Amadeu M.V.M. Soares; Etelvina Figueira; Rosa Freitas

2014-01-01T23:59:59.000Z

272

Response of zinc, iron and copper status parameters to supplementation with zinc or zinc and iron in women  

SciTech Connect (OSTI)

Supplementation with zinc at levels available over-the-counter may compromise iron or copper status. This study examined the effects of zinc(50mg/day) or zinc and iron(50 mg each/day) on 18 women aged 25-40. Subjects were matched on initial levels of serum ferritin(SF) and erythrocyte superoxide dismutase(ESOD) and randomly assigned to Group Z (zinc) or F-Z (iron and zinc). The following were measured pretreatment and after 6 and 10 weeks treatment: serum zinc (BZ), salivary sediment zinc (SSZ), hemoglobin (Hgb), hematocrit (Hct), SF, serum ceruloplasmin (Cp) and ESOD. Effects of treatment and weeks of treatment on changes from initial blood and saliva levels were analyzed using AOV. BZ increased (P=0.0144) and ESOD decreased (P=0.0001) with weeks of treatment. Differences due to treatment are presented. No effects were noted on Hgb, Hct or Cp. Intakes of zinc supplements at about 4X RDA appear to decrease copper(ESOD) and iron(SF) status. Use of iron w/zinc may be protective for FE but not Cu, and may compromise zinc (SSZ) status.

Yadrick, K.; Kenney, M.A.; Winterfeldt, E.

1986-03-05T23:59:59.000Z

273

Structural and biophysical properties of metal-free pathogenic SOD1 mutants A4V and G93A  

SciTech Connect (OSTI)

Amyotrophic lateral sclerosis (ALS) is a fatal, progressive neurodegenerative disease characterized by the destruction of motor neurons in the spinal cord and brain. A subset of ALS cases are linked to dominant mutations in copper-zinc superoxide dismutase (SOD1). The pathogenic SOD1 variants A4V and G93A have been the foci of multiple studies aimed at understanding the molecular basis for SOD1-linked ALS. The A4V variant is responsible for the majority of familial ALS cases in North America, causing rapidly progressing paralysis once symptoms begin and the G93A SOD1 variant is overexpressed in often studied murine models of the disease. Here we report the three-dimensional structures of metal-free A4V and of metal-bound and metal-free G93A SOD1. In the metal-free structures, the metal-binding loop elements are observed to be severely disordered, suggesting that these variants may share mechanisms of aggregation proposed previously for other pathogenic SOD1 proteins.

Galaleldeen, Ahmad; Strange, Richard W.; Whitson, Lisa J.; Antonyuk, Svetlana V.; Narayana, Narendra; Taylor, Alexander B.; Schuermann, Jonathan P.; Holloway, Stephen P.; Hasnain, S.Samar; Hart, P. John; (Texas-HSC); (Liverpool)

2010-07-19T23:59:59.000Z

274

HIV-1 Tat neurotoxicity: A model of acute and chronic exposure, and neuroprotection by gene delivery of antioxidant enzymes  

Science Journals Connector (OSTI)

HIV-associated neurocognitive disorder (HAND) is an increasingly common, progressive disease characterized by neuronal loss and progressively deteriorating CNS function. HIV-1 gene products, particularly gp120 and Tat elicit reactive oxygen species (ROS) that lead to oxidant injury and cause neuron apoptosis. Understanding of, and developing therapies for, HAND requires accessible models of the disease. We have devised experimental approaches to studying the acute and chronic effects of Tat on the CNS. We studied acute exposure by injecting recombinant Tat protein into the caudate-putamen (CP). Ongoing Tat expression, which more closely mimics HIV-1 infection of the brain, was studied by delivering Tat-expression over time using an SV40-derived gene delivery vector, SV(Tat). Both acute and chronic Tat exposure induced lipid peroxidation and neuronal apoptosis. Finally, prior administration of recombinant SV40 vectors carrying antioxidant enzymes, copper/zinc superoxide dismutase (SOD1) or glutathione peroxidase (GPx1), protected from Tat-induced apoptosis and oxidative injury. Thus, injection of recombinant HIV-1 Tat and the expression vector, SV(Tat), into the rat CP cause respectively acute or ongoing apoptosis and oxidative stress in neurons and may represent useful animal models for studying the pathogenesis and, potentially, treatment of HIV-1 Tat-related damage.

Lokesh Agrawal; Jean-Pierre Louboutin; Beverly A.S. Reyes; Elisabeth J. Van Bockstaele; David S. Strayer

2012-01-01T23:59:59.000Z

275

5-Hydroxymethylfurfural, an antioxidant agent from Alpinia oxyphylla Miq. improves cognitive impairment in A?1–42 mouse model of Alzheimer's disease  

Science Journals Connector (OSTI)

Abstract 5-Hydroxymethylfurfural (5-HMF) is a main effective compound of Alpinia oxyphylla Miq. ethanol extract, which showed memory improvement activity against Alzheimer's disease in previous study. In order to identify a potential therapeutic agent, the neuroprotective effects of 5-HMF on impairment of cognition and memory function induced by intracerebroventricular (ICV) injection of A?1–42 were investigated in vivo. The mice were treated with 5-HMF at dose of 15 ?g/kg and 150 ?g/kg (ICV) for five consecutive days after ICV-A?1–42. The results showed that 5-HMF significantly ameliorated learning and memory impairment evaluated by the locomotor activity, Y-maze test, and Morris water maze test. Furthermore, 5-HMF significantly inhibited the ?-secretase activity, decreased the content of A?1–42 and malondialdehyde (MDA), and increased the antioxidative enzyme activities including superoxide dismutase (SOD) and glutathione peroxidase (GPx). Results of hippocampus slices showed that neuronal were integrated and regularly arranged in the groups which were administered along with 5-HMF, indicating that 5-HMF could mitigate the degree of neuronal damage. The present study indicated that 5-HMF may serve as a potential therapeutic agent for the treatment of Alzheimer's disease.

Aijing Liu; Xu Zhao; Huan Li; Zhi Liu; Bing Liu; Xin Mao; Lin Guo; Kaishun Bi; Ying Jia

2014-01-01T23:59:59.000Z

276

Effect of organic ligands on lead-induced oxidative damage and enhanced antioxidant defense in the leaves of Vicia faba plants  

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Abstract The biogeochemical behavior of metals varies with their chemical speciation. The present study evaluated the effect of metal speciation on lead-induced oxidative stress to Vicia faba leaves. Lead was applied to V. faba plants in the form of lead nitrate alone or chelated by citric acid (CA) and ethylenediaminetetraacetic acid (EDTA) in hydroponic conditions. The exposure time for all the treatments was 1, 4, 8, 12 and 24 h. The activation of antioxidant enzymes in V. faba leaves varies with Pb speciation and duration of exposure. Application of Pb alone increased the activities of superoxide dismutases (SOD), guaiacol peroxidase (GPOX), ascorbate peroxidase (APX) and glutathione reductase (GR) while reducing that of catalase (CAT) in V. faba leaves. Application of EDTA dose dependently alleviated the Pb-induced activation of SOD, APX, GPOX and GR, and depression of CAT by decreasing Pb accumulation in V. faba leaves. By contrast, CA had no effect on Pb accumulation and antioxidant enzyme activities except that the activation of SOD, APX, GPOX and GR, and reduction of CAT was delayed. The results showed that the physiological responses of V. faba leaves to Pb toxicity vary with its chemical speciation. Therefore, it is proposed that metal speciation must be given consideration in risk assessment and remediation studies.

Muhammad Shahid; Eric Pinelli; Bertrand Pourrut; Camille Dumat

2014-01-01T23:59:59.000Z

277

Xanthohumol, a prenylated flavonoid from hops (Humulus lupulus L.), protects rat tissues against oxidative damage after acute ethanol administration  

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Abstract Ethanol-mediated free radical generation is directly involved in alcoholic liver disease. In addition, chronic alcohol bingeing also induces pathological changes and dysfunction in multi-organs. In the present study, the protective effect of xanthohumol (XN) on ethanol-induced damage was evaluated by determining antioxidative parameters and stress oxidative markers in liver, kidney, lung, heart and brain of rats. An acute treatment (4 g/kg b.w.) of ethanol resulted in the depletion of superoxide dismutase, catalase and glutathione S-transferase activities and reduced glutathione content. This effect was accompanied by the increased activity of tissue damage marker enzymes (glutamate oxaloacetate transaminase, glutamate pyruvate transaminase and lactate dehydrogenase) and a significant increase in lipid peroxidation and hydrogen peroxide concentrations. Pre-treatment with XN protected rat tissues from ethanol-induced oxidative imbalance and partially mitigated the levels to nearly normal levels in all tissues checked. This effect was dose dependent, suggesting that XN reduces stress oxidative and protects rat tissues from alcohol-induced injury.

Carmen Pinto; Juan J. Cestero; Beatriz Rodríguez-Galdón; Pedro Macías

2014-01-01T23:59:59.000Z

278

Phenolic profile and effect of regular consumption of Brazilian red wines on in vivo antioxidant activity  

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Abstract In this study, Vitis vinifera L wines cv. Cabernet Franc, Merlot, Sangiovese and Syrah, 2006 and 2007 vintages, produced in São Joaquim, a new wine-producing region in southern Brazil, were evaluated. As phenolic compound content is one of the most important parameters in assessing wine quality and is possibly partially responsible for the beneficial health properties of wines, in this paper the levels of the main anthocyanins, flavonols, hydroxycinnamic acid and hydroxybenzoic acid (HPLC-DAD and HPLC-DAD–MS analysis) and the in vivo antioxidant activity in mice are reported. The antioxidant capacity of plasma was assessed through the reduction of ferric iron (FRAP). Lipid peroxidation (TBARS), carbonyl protein (CP), reduced glutathione (GSH) levels and the catalase (CAT), superoxide dismutase (SOD) and glutathione peroxidase (GPx) activity were determined in livers of the test animals. The results for the phenolic compounds content of the wine samples were considered appropriate for quality red wines, and the wine consumption promoted a significant increase in FRAP and decreases in the TBARS and CP levels and in the CAT, SOD and \\{GPx\\} activity. Moreover, the phenolic content of the wines was positively correlated with the in vivo antioxidant capacity promoted by regular wine consumption.

E.F. Gris; F. Mattivi; E.A. Ferreira; U. Vrhovsek; D.W. Filho; R.C. Pedrosa; M.T. Bordignon-Luiz

2013-01-01T23:59:59.000Z

279

The effect of age and length of feeding on the expression of the fructose-copper interaction  

SciTech Connect (OSTI)

Weanling male rats were assigned to either a fructose diet adequate in Cu (Fru+Cu) or a starch diet inadequate in Cu (St{minus}Cu) for either 1,2 or 3 wks. They were then transferred to a Fru{minus}Cu diet for the remainder of the experiment. At wk 10, body weight and relative heart size of rats initially consuming Fru+Cu was inversely related to the week placed on Fru{minus}Cu, but not for those consuming St{minus}Cu. Hematocrit, hepatic Cu concentration and erythrocyte superoxide dismutase activity were significantly lower in rats initially consuming St{minus}Cu as compared to those fed Fru+Cu. Mortality was greatest in rats switched to the Fru{minus}Cu diet at wks 1 and 2 and least in those switched at wk 3 regardless of the diet initially consumed. Plasma cholesterol, triglycerides and blood urea nitrogen concentrations were not altered by the type of diet initially consumed or by the time that the rats were switched to the Fru{minus}Cu diet. The authors conclude that while switching rats to the Fru{minus}Cu diet at 1, 2 or 3 wks after weaning did not significantly improve some of the signs associated with Cu deficiency, it did improve survival.

Lewis, C.G.; Fields, M.; Beal, T. (Dept. of Agriculture, Beltsville, MD (United States) Georgetown Univ., Washington, DC (United States) Univ. of Maryland, College Park (United States))

1991-03-11T23:59:59.000Z

280

2010 Minerals Yearbook U.S. Department of the Interior  

E-Print Network [OSTI]

batteries. Legislation and Government Programs Air Quality, Emissions Limits.--The U.S. Environmental, manganese metal, and manganese ore, as well as a slight increase in high-carbon ferromanganese shipments, ferromanganese, and silicomanganese, and the stochiometric ratios for manganese dioxide and manganese metal

Torgersen, Christian

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Synthesis and Evaluation of a Novel Hybrid Polymer Containing Manganese and Iron Oxides as a Sorbent for As(III) and As(V) Removal  

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The obtained solutions, after dilution, were analyzed for content of both metals using inductively coupled plasma atomic emission spectroscopy ICP-AES (Varian Liberty). ... This research project was supported by the Ministry of Science and Higher Education of Poland in the years 2009–2012 (Project No. N N523 418537). ...

Irena Jacukowicz-Sobala; Daniel Oci?ski; El?bieta Kocio?ek-Balawejder

2013-04-16T23:59:59.000Z

282

Surface characterization studies of TiO2 supported manganese oxide catalysts for low temperature SCR of NO with NH3  

E-Print Network [OSTI]

SCR of NO with NH3 Padmanabha Reddy Ettireddy a , Neeraja Ettireddy a , Sergey Mamedov b , Punit-impregnation method for the low temperature selective catalytic reduction (SCR) of NO with ammonia as a reductantO2 supported catalysts for low temperature SCR reaction at catalyst bed temperature 175 8C under

Boolchand, Punit

283

A study of nerve agent model organophosphonate binding with manganese-A2B-corrole and -A2B2-porphyrin systems  

E-Print Network [OSTI]

of Chemistry and School of Molecular Science (BK 21), Korea Advanced Institute of Science and Technology (KAIST, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong-dong, Yuseong-gu, Daejeon 305 studies gave 1:1 organophosphonate-Mn(PFP-VP) adducts (Job Plot). A clean blue shift occurred for the Mn

Kwak, Juhyoun

284

Identifying surface structural changes in layered Li-excess nickel manganese oxides in high voltage lithium ion batteries: A joint experimental and theoretical study  

SciTech Connect (OSTI)

High voltage cathode materials Li-excess layered oxide compounds Li[Ni{sub x}Li{sub 1/3-2x/3}Mn{sub 2/3-x/3}]O{sub 2} (0 < x < 1/2) are investigated in a joint study combining both computational and experimental methods. The bulk and surface structures of pristine and cycled samples of Li[Ni{sub 1/5}Li{sub 1/5}Mn{sub 3/5}]O{sub 2} are characterized by synchrotron X-Ray diffraction together with aberration corrected Scanning Transmission Electron Microscopy (a-S/TEM). Electron Energy Loss Spectroscopy (EELS) is carried out to investigate the surface changes of the samples before/after electrochemical cycling. Combining first principles computational investigation with our experimental observations, a detailed lithium de-intercalation mechanism is proposed for this family of Li-excess layered oxides. The most striking characteristics in these high voltage high energy density cathode materials are (1) formation of tetrahedral lithium ions at voltage less than 4.45 V and (2) the transition metal (TM) ions migration leading to phase transformation on the surface of the materials. We show clear evidence of a new spinel-like solid phase formed on the surface of the electrode materials after high-voltage cycling. It is proposed that such surface phase transformation is one of the factors contributing to the first cycle irreversible capacity and the main reason for the intrinsic poor rate capability of these materials.

Xu, Bo; Fell, Christopher R.; Chi, Miaofang; Meng, Ying Shirley (ORNL); (Florida); (UCSD)

2011-09-06T23:59:59.000Z

285

Long-term stability of organic carbon-stimulated chromate reduction in contaminated soils, and its relation to manganese redox status  

E-Print Network [OSTI]

National Laboratory, Berkeley, California 94720 e 'university of Chicago, Chicago, Illinois 60637 Savannah River

Tokunaga, Tetsu K.; Wan, Jiamin; Lanzirotti, Antonio; Sutton, Steve R.; Newville, Matthew; Rao, William

2007-01-01T23:59:59.000Z

286

atom. The indium lies almost at the center of gravity of the ring spanned by the five manganese atoms (distance 8.5 pm;  

E-Print Network [OSTI]

1-Mn2a 269.2(2), In 1-Mn2 265.0(2), Inl-CII 248.8(4). Mn2-Mn2a 316.4(2): Inl-Mn2-Mn2a 54.3(1). Inla. 1986, 98, 189-190: Angew. Cliem. Inl. Ed. Engl. 1986, 25. 185 -186. [14] G. L. Simon, L. F. Dahl, J. Am

Silverman, Scott K.

287

Astrocyte-derived nitric oxide in manganese neurotoxicity: from cellular and molecular mechanisms underlying selective neuronal vulnerability in the basal ganglia to potential therapeutic modalities  

E-Print Network [OSTI]

the olfactory system (Tjalve and Henriksson, 1999; Dorman et al., 2002). The nasal route of uptake was reported to account for more than 90% of Mn taken up into the rat olfactory bulb following acute inhalation exposure for up to 8 days (Brenneman et al... the olfactory system (Tjalve and Henriksson, 1999; Dorman et al., 2002). The nasal route of uptake was reported to account for more than 90% of Mn taken up into the rat olfactory bulb following acute inhalation exposure for up to 8 days (Brenneman et al...

Liu, Xuhong

2007-04-25T23:59:59.000Z

288

Morphological changes in the tongue as a consequence of manganese inhalation in a murine experimental model: Light and scanning electron microscopic analysis  

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......UNAM, Mexico Air pollution by suspended particles...these particles are fossils and additives combustion...Introduction Air pollution, as a consequence...is combustion of fuel sources and additives...followed by a fixative solution containing 2......

Teresa Imelda Fortoul; Madeleine Vélez-Cruz; Silvia Antuna-Bizarro; Luis F. Montaño; Vianey Rodriguez-Lara; Liliana Saldivar-Osorio

2010-02-01T23:59:59.000Z

289

Advances in Synthesis of Co- and Ter- Polycarbonates and Polyesters from Non-Petroleum Feedstocks and Kinetic Studies of Ligand Substitution from Manganese Half-Sandwich Complexes  

E-Print Network [OSTI]

polycarbonate properties is to produce an epoxide A/epoxide B/CO2 terpolymer, thus allowing more fine "tuning" of properties to what one may desire while simultaneously influencing relative epoxide reactivity to potentially increase catalytic turnovers...

Poland, Ross Rivers

2012-07-16T23:59:59.000Z

290

Effects of fluorine substitution on the electrochemical performance of layered Li-excess nickel manganese oxides cathode materials for lithium-ion batteries  

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Abstract Li[Li1/6Ni1/4Mn7/12]O2?xFx (x = 0, 0.025, 0.05, 0.075, 0.1) as the cathode materials for rechargeable lithium batteries have been synthesized via the co-precipitation method followed by a high-temperature solid-state reaction. Field emission scanning electron microscopy images exhibit that fluorine substitution catalyzes the growth of the primary particles. Although the initial discharge capacity decreases as the fluorine content increasing, the fluorine substituted materials present significant improvement in the cycling performance. Among the synthesized materials, Li[Li1/6Ni1/4Mn7/12]O1.95F0.05 exhibits excellent high temperature (50 °C) cycling performance with a capacity retention of 93.7% after 30 cycles while the bare Li[Li1/6Ni1/4Mn7/12]O2 cathode exhibited only 73.7%.

Hongxiao Li; Li-Zhen Fan

2013-01-01T23:59:59.000Z

291

Effects of a graphene nanosheet conductive additive on the high-capacity lithium-excess manganese–nickel oxide cathodes of lithium-ion batteries  

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This study examines the effects of a graphene nanosheet (GNS) conductive additive on the...?3) lithium-ion battery cathode containing 92 wt% Li1.1(Mn0.6Ni0.4)0.9O2...microspheres (approximately 6 ?m in diameter)....

Wen-Chin Chen; Cheng-Yu Hsieh; Yu-Ting Weng…

2014-11-01T23:59:59.000Z

292

Structural Evaluation and Solution Integrity of Alkali Metal Salt Complexes of the Manganese 12-Metallacrown-4 (12-MC-4) Structural Type  

E-Print Network [OSTI]

of crystalline salts (LiCl2)[12-MCMn(III)N(shi)-4]- ([(LiCl2),1]-), (Li(trifluoro- acetate))[12-MCMn(III)N(shi)-4:1 metal:metallacrown adducts with lithium and 2:1 metal:metallacrown complexes with sodium and potassium

Gibney, Brian R.

293

Damage of chrome-manganese steels by pulsed fluxes of ions and dense plasma under their separate action on the material in the plasma focus setup  

Science Journals Connector (OSTI)

Two methods of temporal and spatial separation of the fluxes of hot plasma and fast ions in the Plasma Focus setup are experimentally investigated. In the first ... of the experiment, different distances from the...

S. A. Maslyaev; V. N. Pimenov; V. A. Gribkov…

2011-10-01T23:59:59.000Z

294

GEOCHEMISTRY AND MINERALOGY OF NEOPROTEROZOIC BANDED IRON-FORMATIONS AND SOME SELECTED, SILICEOUS MANGANESE FORMATIONS FROM THE URUCUM DISTRICT, MATO GROSSO DO SUL, BRAZIL  

Science Journals Connector (OSTI)

...Mato-Grossense: Unia£o Geogra¡fica Internacional,Guia da Excursa£o Na° 1 do XVII Congresso Internacional de Geografia, Edia§a£odo Conselho Nacional de Geogra¡fia, Rio de Janeiro, 172 p. a µ Anders, E., and Ebihara, M., 1982, Solar...

Cornelis Klein; Eduardo A. Ladeira

295

Kinetics of adsorption and redox processes on iron and manganese oxides : reactions of As(III) and Se(IV) at goethite and birnessite surfaces.  

E-Print Network [OSTI]

??NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Selenium and arsenic are naturally-occurring, non-metallic… (more)

Scott, Michael James

1991-01-01T23:59:59.000Z

296

Microsoft Word - Mn.doc  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

5 5 Structural Determination of Marine Bacteriogenic Manganese Oxides John R. Bargar, Samuel M. Webb (Stanford Synchrotron Radiation Laboratory), and Bradley M. Tebo (Oregon Health and Science University) Bacterial oxidation of Mn(II) impacts the global geochemical cycling of carbon, nitrogen, sulfur, nutrients, and contaminants in the environment. Manganese is abundant in the biosphere (~10 14 Kg of suspended and dissolved manganese in the oceans) and is second only to iron in relative terrestrial abun- dance of transition metals. Manganese is an important nutrient in the marine water column and is fundamentally required for photosynthesis. The acquisition of manganese by organisms and the biogeochemistry of manganese in the oceans is therefore an

297

Synthesis of a spheroidal bis-porphyrin: a ligand designed to accept two catalytic metal ions in an isolated environment  

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A spheroidal bis-porphyrin (dual capped quadruply cofacial dimeric tetraphenylporphyrin, 1), designed to be employed as a ligand for a class of catalysts that mimic the combined enzyme activities of superoxide dismutase and catalase, has been synthesized in 9 steps. C-Alkylation of 2-(2?-lithio-5?-tert-butyldimethylsiloxy-methyl)phenyl-1,3-dioxolane (D) with tetra-bromide 6, prepared from bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylic dianhydride by 5 steps, afforded the key intermediate, tetra-alkylated compound 3a, in 68% yield. An alternative route to 3, O-alkylations of tetrol 4 with aliphatic halides 5, was also tested. Conversion of the four protected hydroxy groups to bromo substituents is crucial in the preparation of porphyrin 2. Therefore, tetra-benzyl bromide 24b was prepared and then treated with pyrrole in the presence of boron trifluoride etherate, followed by DDQ oxidation to obtain the capped porphyrin 2. The coupling of two molecules of 2 to form a spheroidal porphyrin 1 was carried out in dilute DMF solution, using 0.8 equivalent of 2-trimethylsilylethane sulfonamide (H2NSO2CH2CH2Si(CH3)3, SES-NH2) and cesium carbonate. The structure of 1 was confirmed by 1H NMR, UV/VIS, FABMS and laser desorption high resolution MS. The two isomers of 1, eclipsed and gauche, formed due to two possible modes of approach of the units of 2, were observed in approximately 1 : 1 ratio by both 1H NMR and HPLC techniques.

Zhang Hong-Yue; Yu Jian-Qiu; Thomas C. Bruice

1994-01-01T23:59:59.000Z

298

Apolipoprotein E Genotype-Dependent Paradoxical Short-Term Effects of {sup 56}Fe Irradiation on the Brain  

SciTech Connect (OSTI)

Purpose: In humans, apolipoprotein E (apoE) is encoded by three major alleles ({epsilon}2, {epsilon}3, and {epsilon}4) and, compared to apoE3, apoE4 increases the risk of developing Alzheimer disease and cognitive impairments following various environmental challenges. Exposure to irradiation, including that of {sup 56}Fe, during space missions poses a significant risk to the central nervous system, and apoE isoform might modulate this risk. Methods and Materials: We investigated whether apoE isoform modulates hippocampus-dependent cognitive performance starting 2 weeks after {sup 56}Fe irradiation. Changes in reactive oxygen species (ROS) can affect cognition and are induced by irradiation. Therefore, after cognitive testing, we assessed hippocampal ROS levels in ex vivo brain slices, using the ROS-sensitive fluorescent probe, dihydroethidium (DHE). Brain levels of 3-nitrotyrosine (3-NT), CuZn superoxide dismutase (CuZnSOD), extracellular SOD, and apoE were assessed using Western blotting analysis. Results: In the water maze, spatial memory retention was impaired by irradiation in apoE2 and apoE4 mice but enhanced by irradiation in apoE3 mice. Irradiation reduced DHE-oxidation levels in the enclosed blade of the dentate gyrus and levels of 3-NT and CuZnSOD in apoE2 but not apoE3 or apoE4 mice. Finally, irradiation increased apoE levels in apoE3 but not apoE2 or apoE4 mice. Conclusions: The short-term effects of {sup 56}Fe irradiation on hippocampal ROS levels and hippocampus-dependent spatial memory retention are apoE isoform-dependent.

Haley, Gwendolen E. [Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR (United States) [Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR (United States); Division of Neuroscience, Oregon National Primate Research Center, Beaverton, OR (United States); Villasana, Laura; Dayger, Catherine; Davis, Matthew J. [Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR (United States)] [Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR (United States); Raber, Jacob, E-mail: raberj@ohsu.edu [Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR (United States) [Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR (United States); Division of Neuroscience, Oregon National Primate Research Center, Beaverton, OR (United States); Department of Neurology, Oregon Health and Science University, Portland, OR (United States)

2012-11-01T23:59:59.000Z

299

Time course of systemic oxidative stress and inflammatory response induced by an acute exposure to Residual Oil Fly Ash  

SciTech Connect (OSTI)

It is suggested that systemic oxidative stress and inflammation play a central role in the onset and progression of cardiovascular diseases associated with the exposure to particulate matter (PM). The aim of this work was to evaluate the time changes of systemic markers of oxidative stress and inflammation, after an acute exposure to Residual Oil Fly Ash (ROFA). Female Swiss mice were intranasally instilled with a ROFA suspension (1.0 mg/kg body weight) or saline solution, and plasma levels of oxidative damage markers [thiobarbituric acid reactive substances (TBARSs) and protein carbonyls], antioxidant status [reduced (GSH) and oxidized (GSSG) glutathione, ascorbic acid levels, and superoxide dismutase (SOD) activity], cytokines levels, and intravascular leukocyte activation were evaluated after 1, 3 or 5 h of exposure. Oxidative damage to lipids and decreased GSH/GSSG ratio were observed in ROFA-exposed mice as early as 1 h. Afterwards, increased protein oxidation, decreased ascorbic acid content and SOD activity were found in this group at 3 h. The onset of an adaptive response was observed at 5 h after the ROFA exposure, as indicated by decreased TBARS plasma content and increased SOD activity. The observed increase in oxidative damage to plasma macromolecules, together with systemic antioxidants depletion, may be a consequence of a systemic inflammatory response triggered by the ROFA exposure, since increased TNF-? and IL-6 plasma levels and polymorphonuclear leukocytes activation was found at every evaluated time point. These findings contribute to the understanding of the increase in cardiovascular morbidity and mortality, in association with environmental PM inhalation. - Highlights: • An acute exposure to ROFA triggers the occurrence of systemic oxidative stress. • Changes in plasmatic oxidative stress markers appear as early as 1 h after exposure. • ROFA induces proinflammatory cytokines release and intravascular leukocyte activation. • PMN activation is a relevant source of reactive oxygen species in this model. • These findings may account for previously described cardiopulmonary alterations.

Marchini, T.; Magnani, N.D. [Cátedra de Química General e Inorgánica, Instituto de Bioquímica y Medicina Molecular (IBIMOL UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 954, C1113AAB Buenos Aires (Argentina); Paz, M.L. [Cátedra de Inmunología, Instituto de Estudios de la Inmunidad Humoral (IDEHU UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 954, C1113AAB Buenos Aires (Argentina); Vanasco, V. [Cátedra de Química General e Inorgánica, Instituto de Bioquímica y Medicina Molecular (IBIMOL UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 954, C1113AAB Buenos Aires (Argentina); Tasat, D. [CESyMA, Facultad de Ciencia Tecnología, Universidad Nacional de General San Martín, Martín de Irigoyen 3100, 1650 San Martín, Buenos Aires (Argentina); González Maglio, D.H. [Cátedra de Inmunología, Instituto de Estudios de la Inmunidad Humoral (IDEHU UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 954, C1113AAB Buenos Aires (Argentina); and others

2014-01-15T23:59:59.000Z

300

Protection of cisplatin-induced spermatotoxicity, DNA damage and chromatin abnormality by selenium nano-particles  

SciTech Connect (OSTI)

Cisplatin (CIS), an anticancer alkylating agent, induces DNA adducts and effectively cross links the DNA strands and so affects spermatozoa as a male reproductive toxicant. The present study investigated the cellular/biochemical mechanisms underlying possible protective effect of selenium nano-particles (Nano-Se) as an established strong antioxidant with more bioavailability and less toxicity, on reproductive toxicity of CIS by assessment of sperm characteristics, sperm DNA integrity, chromatin quality and spermatogenic disorders. To determine the role of oxidative stress (OS) in the pathogenesis of CIS gonadotoxicity, the level of lipid peroxidation (LPO), antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSH-Px) and peroxynitrite (ONOO) as a marker of nitrosative stress (NS) and testosterone (T) concentration as a biomarker of testicular function were measured in the blood and testes. Thirty-two male Wistar rats were equally divided into four groups. A single IP dose of CIS (7 mg/kg) and protective dose of Nano-Se (2 mg/kg/day) were administered alone or in combination. The CIS-exposed rats showed a significant increase in testicular and serum LPO and ONOO level, along with a significant decrease in enzymatic antioxidants levels, diminished serum T concentration and abnormal histologic findings with impaired sperm quality associated with increased DNA damage and decreased chromatin quality. Coadministration of Nano-Se significantly improved the serum T, sperm quality, and spermatogenesis and reduced CIS-induced free radical toxic stress and spermatic DNA damage. In conclusion, the current study demonstrated that Nano-Se may be useful to prevent CIS-induced gonadotoxicity through its antioxidant potential. Highlights: ? Cisplatin (CIS) affects spermatozoa as a male reproductive toxicant. ? Effect of Nano-Se on CIS-induced spermatotoxicity was investigated. ? CIS-exposure induces oxidative sperm DNA damage and impairs steroidogenesis. ? Nano-Se retained sperm quality against CIS-induced free radicals toxic stress.

Rezvanfar, Mohammad Amin; Rezvanfar, Mohammad Ali [Department of Toxicology and Pharmacology, Faculty of Pharmacy, and Pharmaceutical Sciences Research Center, Tehran University of Medical Sciences (TUMS), Tehran (Iran, Islamic Republic of)] [Department of Toxicology and Pharmacology, Faculty of Pharmacy, and Pharmaceutical Sciences Research Center, Tehran University of Medical Sciences (TUMS), Tehran (Iran, Islamic Republic of); Shahverdi, Ahmad Reza [Department of Pharmaceutical Biotechnology and Biotechnology Research Centre, Faculty of Pharmacy, TUMS, Tehran (Iran, Islamic Republic of)] [Department of Pharmaceutical Biotechnology and Biotechnology Research Centre, Faculty of Pharmacy, TUMS, Tehran (Iran, Islamic Republic of); Ahmadi, Abbas [Department of Histology and Embryology, Faculty of Veterinary Medicine, Urmia University, Urmia (Iran, Islamic Republic of)] [Department of Histology and Embryology, Faculty of Veterinary Medicine, Urmia University, Urmia (Iran, Islamic Republic of); Baeeri, Maryam; Mohammadirad, Azadeh [Department of Toxicology and Pharmacology, Faculty of Pharmacy, and Pharmaceutical Sciences Research Center, Tehran University of Medical Sciences (TUMS), Tehran (Iran, Islamic Republic of)] [Department of Toxicology and Pharmacology, Faculty of Pharmacy, and Pharmaceutical Sciences Research Center, Tehran University of Medical Sciences (TUMS), Tehran (Iran, Islamic Republic of); Abdollahi, Mohammad, E-mail: mohammad.abdollahi@utoronto.ca [Department of Toxicology and Pharmacology, Faculty of Pharmacy, and Pharmaceutical Sciences Research Center, Tehran University of Medical Sciences (TUMS), Tehran (Iran, Islamic Republic of)] [Department of Toxicology and Pharmacology, Faculty of Pharmacy, and Pharmaceutical Sciences Research Center, Tehran University of Medical Sciences (TUMS), Tehran (Iran, Islamic Republic of)

2013-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Protective effect of aged garlic extract against the oxidative stress induced by cisplatin on blood cells parameters and hepatic antioxidant enzymes in rats  

Science Journals Connector (OSTI)

Abstract Cisplatin (CP) is one of the most active cytotoxic drugs. However, it has several side effects that are associated with increased oxidative stress. Aged garlic extract (AGE) is a natural product containing different compounds with antioxidant activity. The present study aimed to evaluate the effect of AGE on CP-induced hepatotoxicity. Four equally male rat groups: control, AGE-treated (250 mg/kg once for 21 days), CP-treated (7.5 mg/kg, once intraperitoneal), combined AGE and CP-treated were used. Blood samples were collected to investigate blood picture and serum levels of aspartate aminotransferase (AST), alanine aminotransferase (ALT), bilirubin (TSB) and albumin. The liver of each rat was excised, cleaned, weighed, rinsed in ice-cold saline and homogenized for assessment malondialdehyde (MDA) level, catalase (CAT) and superoxide dismutase (SOD) activities and level of reduced glutathione (GSH). Histological examination was also carried out. AGE-pretreated rats revealed significant reduction in serum levels of AST, ALT & TSB and increase serum albumin level induced by CP administration. Furthermore, AGE significantly ameliorated CP-induced increase in MDA level and decrease in GSH level, CAT and SOD activities in liver tissue homogenates. Additionally, histopathological and blood picture examinations revealed markedly ameliorated CP-induced toxicity on blood cells parameters and liver structure. Our results prove that AGE has antioxidant and protective effects against CP-induced oxidative stress and changes in parameters of blood cells and liver structure in rats. Thus, it could be used as a dietary supplementation to reduce toxic side effects of anticancer drugs.

Ashraf Y. Nasr

2014-01-01T23:59:59.000Z

302

Studies on the potential protective effect of cinnamon against bisphenol A- and octylphenol-induced oxidative stress in male albino rats  

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Abstract Among the numerous chemicals discharged into the surrounding environment, bisphenol A (BPA) and octylphenol (OP) have been shown to increase oxidative stress in body by disturbing the prooxidant/antioxidant balance of cells. Cinnamon aqueous extract (CAE) is a natural product rich in polyphenolic compounds that have antioxidant activity. This study was designed to investigate the protective efficacy of CAE against oxidative disorders induced by BPA and OP in male albino rats. Animals were divided into 6 groups (10 rats each) and treated orally, 3 times weekly for 50 days. Group 1: control vehicle (olive oil); group 2 (25 mg BPA/kg b.wt./day); group 3 (25 mg OP/kg b.wt./day); group 4 (200 mg CAE/kg b.wt./day); group 5 (CAE 2 h before BPA administration); and group 6 (CAE 2 h before OP administration). BPA- and OP-exposed groups showed insignificant elevation in the final body weight; weight gains and significant reduction only in the relative kidneys weight. Also, BPA and OP exposure resulted in significant increase in serum urea, creatinine and kidney, brain, testicular malondialdehyde (MDA) levels. Significant reduction in tissues reduced glutathione (GSH) contents; catalase (CAT) and superoxide dismutase (SOD) activities were also recorded in BPA and OP exposed animals compared to the control vehicle group. Pretreatment with CAE 2 h either before BPA or OP administration ameliorated the BPA- and OP-induced body weight; weight gains and relative organs weight changes and biochemical adverse effects. CAE pretreatment also protected against the recorded pathological changes in kidney, brain and testis. In conclusion, CAE could ameliorate the oxidative toxic effects of BPA and OP indicating its protective antioxidant effect.

Ashraf M. Morgan; Salah S. El-Ballal; Badre E. El-Bialy; Nermeen B. EL-Borai

2014-01-01T23:59:59.000Z

303

Silver nanoparticles induced heat shock protein 70, oxidative stress and apoptosis in Drosophila melanogaster  

SciTech Connect (OSTI)

Due to the intensive commercial application of silver nanoparticles (Ag NPs), risk assessment of this nanoparticle is of great importance. Our previous in vitro study demonstrated that Ag NPs caused DNA damage and apoptosis in mouse embryonic stem cells and fibroblasts. However, toxicity of Ag NPs in vivo is largely lacking. This study was undertaken to examine the toxic effects of well-characterized polysaccharide coated 10 nm Ag NPs on heat shock stress, oxidative stress, DNA damage and apoptosis in Drosophila melanogaster. Third instar larvae of D. melanogaster were fed a diet of standard cornmeal media mixed with Ag NPs at the concentrations of 50 and 100 mug/ml for 24 and 48 h. Ag NPs up-regulated the expression of heat shock protein 70 and induced oxidative stress in D. melanogaster. Malondialdehyde level, an end product of lipid peroxidation was significantly higher while antioxidant glutathione content was significantly lower in Ag NPs exposed organisms. Activities of antioxidant enzyme superoxide dismutase and catalase were also significantly higher in the organisms exposed to Ag NPs. Furthermore, Ag NPs up-regulated the cell cycle checkpoint p53 and cell signaling protein p38 that are involved in the DNA damage repair pathway. Moreover, activities of caspase-3 and caspase-9, markers of apoptosis were significantly higher in Ag NPs exposed organisms. The results indicate that Ag NPs in D. melanogaster induce heat shock stress, oxidative stress, DNA damage and apoptosis. This study suggests that the organism is stressed and thus warrants more careful assessment of Ag NPs using in vivo models to determine if chronic exposure presents developmental and reproductive toxicity.

Ahamed, Maqusood; Posgai, Ryan; Gorey, Timothy J.; Nielsen, Mark [Department of Biology, Center for Tissue Regeneration and Engineering, University of Dayton, Dayton, OH 45469 (United States); Hussain, Saber M. [Applied Biotechnology Branch, Human Effectiveness Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, OH 45433 (United States); Rowe, John J., E-mail: John.Rowe@notes.udayton.ed [Department of Biology, Center for Tissue Regeneration and Engineering, University of Dayton, Dayton, OH 45469 (United States)

2010-02-01T23:59:59.000Z

304

Evaluation of the pharmacokinetics and cardiotoxicity of doxorubicin in rat receiving nilotinib  

SciTech Connect (OSTI)

Doxorubicin (DOX) is a potent chemotherapy drug with a narrow therapeutic window. Nilotinib, a small-molecule Bcr-Abl tyrosine kinase inhibitor, was reported to reverse multidrug resistance (MDR) mediated by P-glycoprotein (P-gp) transmembrane transporters. The present study aimed to investigate nilotinib's affection on the steady-state pharmacokinetics, disposition and cardiotoxicity of DOX. A total of 24 male Sprague–Dawley rats were randomized into four groups (6 in each) and received the following regimens: saline, intravenous DOX (5 mg/kg) alone, and DOX co-administrated with either 20 or 40 mg/kg nilotinib. Blood was withdrawn at 12 time points till 72 h after DOX injection and the concentrations of DOX and its metabolite doxorubicinol (DOXol) in serum and cardiac tissue were assayed by LC–MS–MS method. To determine the cardiotoxicity, the following parameters were investigated: creatine kinase, lactate dehydrogenase, malondialdehyde, and superoxide dismutase. Histopathological examination of heart section was carried out to evaluate the extent of cardiotoxicity after treatments. The results showed that pretreatment of 40 mg/kg nilotinib increased the AUC{sub 0–t} and C{sub max} of DOX and DOXol. However, their accumulation in cardiac tissue was significantly decreased when compared with the group that received DOX alone. In addition, biochemical and histopathological results showed that 40 mg/kg nilotinib reduced the cardiotoxicity induced by DOX administration. In conclusion, co-administration of nilotinib increased serum exposure, but significantly decreased the accumulation of DOX in cardiac tissue. Consistent with in vitro profile, oral dose of 40 mg/kg nilotinib significantly decreased the cardiotoxicity of DOX in rat by enhancing P-gp activity in the heart.

Zhou, Zhi-yong [Department of Pharmacy, Affiliated Sixth People's Hospital, Shanghai Jiao Tong University, 200233 Shanghai (China); School of Pharmacy, Shanghai Jiao Tong University, 200240 Shanghai (China); Wan, Li-li; Yang, Quan-jun; Han, Yong-long; Li, Yan; Yu, Qi [Department of Pharmacy, Affiliated Sixth People's Hospital, Shanghai Jiao Tong University, 200233 Shanghai (China); Guo, Cheng, E-mail: guochengphd@yahoo.com.cn [Department of Pharmacy, Affiliated Sixth People's Hospital, Shanghai Jiao Tong University, 200233 Shanghai (China); School of Pharmacy, Shanghai Jiao Tong University, 200240 Shanghai (China); Li, Xiao, E-mail: lixiao3326@yahoo.com.cn [Department of Hematology, Affiliated Sixth people's Hospital, Shanghai Jiao Tong University, 200233 Shanghai (China)

2013-10-01T23:59:59.000Z

305

Electron Transfer Coupled to Mn(II) Oxidation in Two Deep-Sea Pacific Ocean Isolates  

Science Journals Connector (OSTI)

The abilities of a number of different bacteria to couple the oxidation of manganous manganese to the generation of useful energy have been reviewed (Ehrlich, 1978). The oxidation of manganese is believed to o...

E. J. Arcuri; H. L. Ehrlich

1980-01-01T23:59:59.000Z

306

The water–water cycle as alternative photon and electron sinks  

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...photoproduced superoxide and hydrogen peroxide to suppress the production of hydroxyl radicals...thylakoids to suppress the production of reactive species...of superoxide and hydrogen peroxide from their...of O2 by several methods (for a review...

2000-01-01T23:59:59.000Z

307

The Architecture of the Qo Site of Cytochrome bc1 Complex Probed...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Architecture of the Qo Site of Cytochrome bc1 Complex Probed by Superoxide Production. The Architecture of the Qo Site of Cytochrome bc1 Complex Probed by Superoxide Production....

308

E-Print Network 3.0 - antioxidant therapeutic advances Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: Superoxide Anion Concentration using Antioxidant Nanoreactors, Journal of Optoelectronics and Advanced... Enzyme Mimic to Develop Antioxidant Nanoreactors: From Synthesis...

309

2011 Minerals Yearbook U.S. Department of the Interior  

E-Print Network [OSTI]

batteries. Legislation and Government Programs Air Quality, Emissions Limits.--In June, the U, ferromanganese, and silicomanganese, and the stochiometric ratios for manganese dioxide and manganese metal%, 16%, and 7%, respectively (table 1). The average spot market price for manganese metal increased

Torgersen, Christian

310

?-? Rearrangement of vinylphosphonium ligand in the coordination sphere of manganese, the crystal and molecular structure of [?5-C5H5(CO)2Mn(?2-PhHc=CHP+Ph3]Cl?  

Science Journals Connector (OSTI)

By the x-ray diffraction analysis method we established the structure of [Cp(CO)2Mn (?-PhHC=CHP+Ph3)]Cl?.

N. E. Kolobova; O. M. Khitrova…

1987-09-01T23:59:59.000Z

311

Lavinskyite, K(LiCu)Cu6(Si4O11)2(OH)4, isotypic with plancheite, a new mineral from the Wessels mine, Kalahari Manganese Fields, South Africa  

E-Print Network [OSTI]

by the undulating, brucite-like layers consisting of three distinct octahedral sites occupied mainly by Cu

Downs, Robert T.

312

FTIR spectra and normal-mode analysis of a tetranuclear Manganese adamantane-like complex in two electrochemically prepared oxidation states: Relevance to the oxygen-evolving complex of Photosystem II  

SciTech Connect (OSTI)

The IR spectra and normal-mode analysis of the adamantane-like compound [Mn4O6(bpea)4]n+ in two oxidation states, MnIV4 and MnIIIMnIV3, that are relevant to the oxygen-evolving complex of photosystem II are presented. Mn-O vibrational modes are identified with isotopic exchange, 16O->18O, of the mono-(mu)-oxo bridging atoms in the complex. IR spectra of the MnIIIMnIV3 species are obtained by electrochemical reduction of the MnIV4 species using a spectroelectrochemical cell, based on attenuated total reflection [Visser et al. Anal Chem 2001, 73, 4374-4378]. A novel method of subtraction is used to reduce background contributions from solvent and ligand modes, and the difference and double-difference spectra are used in identifying Mn-O bridging modes that are sensitive to oxidation state change. Two strong IR bands are observed for the MnIV4 species at 745 and 707 cm-1 and a weaker band at 510 cm-1. Upon reduction, the MnIIIMnIV3 species exhibits two strong IR bands at 745 and 680 cm-1, and several weaker bands are observed in the 510 - 425 cm-1 range. A normal mode analysis is performed to assign all the relevant bridging modes in the oxidized MnIV4 and reduced MnIIIMnIV3 species. The calculated force constants for the MnIV4 species are = 3.15 mdynAngstrom, = 0.55 mdyn/Angstrom, and = 0.20 mdyn/Angstrom. The force constants for the MnIIIMnIV3 species are = 3.10 mdyn/Angstrom, = 2.45 mdyn/Angstrom, = 0.40, and = 0.15 mdyn/Angstrom. This study provides insights for the identification of Mn-O modes in the IR spectra of the photosynthetic oxygen-evolving complex during its catalytic cycle.

Visser, Hendrik; Dube, Christopher E.; Armstrong, William H.; Sauer, Kenneth; Yachandra, Vittal K.

2002-03-19T23:59:59.000Z

313

Consulting, Construction and Operating Results of a Full-Scale Biotechnological Plant for the Oxidation of Iron and Manganese with Simultaneous Elimination of Volatile Chlorinated Hydrocarbons from Ground Water  

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The ground water in the south part of Hannover, known ... Südstadt”, is partially polluted with volatile chlorinated hydrocarbons (C1HC). This contamination originated from a ... the factory stands as well as the...

V. Quentmeier; M. Saake

1990-01-01T23:59:59.000Z

314

JOURNAL DE PHYSIQUE Colloque C 1, supplbment au no 2-3, Tome 32, Fkvrier-Mars 1971,page C 1 -62 THE ULTRASONIC LOSS OF MANGANESE FERRITES (Mn,Fe, -,04)  

E-Print Network [OSTI]

JOURNAL DE PHYSIQUE Colloque C 1, supplbment au no 2-3, Tome 32, Fkvrier-Mars 1971,page C 1 - 62 Eindhoven. The Netherlands (") Rksumk. -Des mesures de pertes ultrasoniques ont bt6 effectuhs sur des with the Royal Netherlands Naval College. Den Helder. The Netherlands. FIG.2. -The frequency as a function

Paris-Sud XI, Université de

315

Interdependent genotoxic mechanisms of monomethylarsonous acid: Role of ROS-induced DNA damage and poly(ADP-ribose) polymerase-1 inhibition in the malignant transformation of urothelial cells  

SciTech Connect (OSTI)

Exposure of human bladder urothelial cells (UROtsa) to 50 nM of the arsenic metabolite, monomethylarsonous acid (MMA{sup III}), for 12 weeks results in irreversible malignant transformation. The ability of continuous, low-level MMA{sup III} exposure to cause an increase in genotoxic potential by inhibiting repair processes necessary to maintain genomic stability is unknown. Following genomic insult within cellular systems poly(ADP-ribose) polymerase-1 (PARP-1), a zinc finger protein, is rapidly activated and recruited to sites of DNA strand breaks. When UROtsa cells are continuously exposed to 50 nM MMA{sup III}, PARP-1 activity does not increase despite the increase in MMA{sup III}-induced DNA single-strand breaks through 12 weeks of exposure. When UROtsa cells are removed from continuous MMA{sup III} exposure (2 weeks), PARP-1 activity increases coinciding with a subsequent decrease in DNA damage levels. Paradoxically, PARP-1 mRNA expression and protein levels are elevated in the presence of continuous MMA{sup III} indicating a possible mechanism to compensate for the inhibition of PARP-1 activity in the presence of MMA{sup III}. The zinc finger domains of PARP-1 contain vicinal sulfhydryl groups which may act as a potential site for MMA{sup III} to bind, displace zinc ion, and render PARP-1 inactive. Mass spectrometry analysis demonstrates the ability of MMA{sup III} to bind a synthetic peptide representing the zinc-finger domain of PARP-1, and displace zinc from the peptide in a dose-dependent manner. In the presence of continuous MMA{sup III} exposure, continuous 4-week zinc supplementation restored PARP-1 activity levels and reduced the genotoxicity associated with MMA{sup III}. Zinc supplementation did not produce an overall increase in PARP-1 protein levels, decrease the levels of MMA{sup III}-induced reactive oxygen species, or alter Cu-Zn superoxide dismutase levels. Overall, these results present two potential interdependent mechanisms in which MMA{sup III} may increase the susceptibility of UROtsa cells to genotoxic insult and/or malignant transformation: elevated levels of MMA{sup III}-induced DNA damage through the production of reactive oxygen species, and the direct MMA{sup III}-induced inhibition of PARP-1.

Wnek, Shawn M.; Kuhlman, Christopher L.; Camarillo, Jeannie M.; Medeiros, Matthew K. [Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ 85721 (United States)] [Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ 85721 (United States); Liu, Ke J. [Department of Pharmaceutical Sciences, College of Pharmacy, The University of New Mexico, Albuquerque, NM 87131 (United States)] [Department of Pharmaceutical Sciences, College of Pharmacy, The University of New Mexico, Albuquerque, NM 87131 (United States); Lau, Serrine S. [Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ 85721 (United States) [Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ 85721 (United States); Southwest Environmental Health Sciences Center, Department of Pharmacology and Toxicology, The University of Arizona Health Sciences Center, Tucson, AZ 85721 (United States); Gandolfi, A.J., E-mail: wnek@pharmacy.arizona.edu [Department of Pharmacology and Toxicology, College of Pharmacy, The University of Arizona, Tucson, AZ 85721 (United States)

2011-11-15T23:59:59.000Z

316

Sodium orthovanadate associated with pharmacological doses of ascorbate causes an increased generation of ROS in tumor cells that inhibits proliferation and triggers apoptosis  

SciTech Connect (OSTI)

Graphical abstract: -- Abstract: Pharmacological doses of ascorbate were evaluated for its ability to potentiate the toxicity of sodium orthovanadate (Na{sub 3}VO{sub 4}) in tumor cells. Cytotoxicity, inhibition of cell proliferation, generation of ROS and DNA fragmentation were assessed in T24 cells. Na{sub 3}VO{sub 4} was cytotoxic against T24 cells (EC{sub 50} = 5.8 ?M at 24 h), but in the presence of ascorbate (100 ?M) the EC{sub 50} fell to 3.3 ?M. Na{sub 3}VO{sub 4} plus ascorbate caused a strong inhibition of cell proliferation (up to 20%) and increased the generation of ROS (4-fold). Na{sub 3}VO{sub 4} did not directly cleave plasmid DNA, at this aspect no synergism was found occurring between Na{sub 3}VO{sub 4} and ascorbate once the resulting action of the combination was no greater than that of both substances administered separately. Cells from Ehrlich ascites carcinoma-bearing mice were used to determine the activity of antioxidant enzymes, the extent of the oxidative damage and the type of cell death. Na{sub 3}VO{sub 4} alone, or combined with ascorbate, increased catalase activity, but only Na{sub 3}VO{sub 4} plus ascorbate increased superoxide dismutase activity (up to 4-fold). Oxidative damage on proteins and lipids was higher due to the treatment done with Na{sub 3}VO{sub 4} plus ascorbate (2–3-fold). Ascorbate potentiated apoptosis in tumor cells from mice treated with Na{sub 3}VO{sub 4}. The results indicate that pharmacological doses of ascorbate enhance the generation of ROS induced by Na{sub 3}VO{sub 4} in tumor cells causing inhibition of proliferation and apoptosis. Apoptosis induced by orthovanadate and ascorbate is closer related to inhibition on Bcl-xL and activation of Bax. Our data apparently rule out a mechanism of cell demise p53-dependent or related to Cdk2 impairment.

Günther, T-hat nia Mara Fischer; Kviecinski, Maicon Roberto; Baron, Carla Cristine; Felipe, Karina Bettega; Farias, Mirelle Sifroni; Ourique da Silva, Fabiana; Bücker, Nádia Cristina Falcão [Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis (Brazil)] [Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis (Brazil); Pich, Claus Tröger [Campus de Araranguá, Universidade Federal de Santa Catarina, Araranguá (Brazil)] [Campus de Araranguá, Universidade Federal de Santa Catarina, Araranguá (Brazil); Ferreira, Eduardo Antonio [Universidade de Brasília, Faculdade de Ceilândia, DF (Brazil)] [Universidade de Brasília, Faculdade de Ceilândia, DF (Brazil); Filho, Danilo Wilhelm [Departamento de Ecologia e Zoologia, Universidade Federal de Santa Catarina, Florianópolis (Brazil)] [Departamento de Ecologia e Zoologia, Universidade Federal de Santa Catarina, Florianópolis (Brazil); Verrax, Julien; Calderon, Pedro Buc [Toxicology and Cancer Biology Research Group, Louvain Drug Research Institute, Université Catholique de Louvain, Brussels (Belgium)] [Toxicology and Cancer Biology Research Group, Louvain Drug Research Institute, Université Catholique de Louvain, Brussels (Belgium); Pedrosa, Rozangela Curi, E-mail: rozangelapedrosa@gmail.com [Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis (Brazil)

2013-01-18T23:59:59.000Z

317

Activation of K{sup +} channels and Na{sup +}/K{sup +} ATPase prevents aortic endothelial dysfunction in 7-day lead-treated rats  

SciTech Connect (OSTI)

Seven day exposure to a low concentration of lead acetate increases nitric oxide bioavailability suggesting a putative role of K{sup +} channels affecting vascular reactivity. This could be an adaptive mechanism at the initial stages of toxicity from lead exposure due to oxidative stress. We evaluated whether lead alters the participation of K{sup +} channels and Na{sup +}/K{sup +}-ATPase (NKA) on vascular function. Wistar rats were treated with lead (1st dose 4 ?g/100 g, subsequent doses 0.05 ?g/100 g, im, 7 days) or vehicle. Lead treatment reduced the contractile response of aortic rings to phenylephrine (PHE) without changing the vasodilator response to acetylcholine (ACh) or sodium nitroprusside (SNP). Furthermore, this treatment increased basal O{sub 2}{sup ?} production, and apocynin (0.3 ?M), superoxide dismutase (150 U/mL) and catalase (1000 U/mL) reduced the response to PHE only in the treated group. Lead also increased aortic functional NKA activity evaluated by K{sup +}-induced relaxation curves. Ouabain (100 ?M) plus L-NAME (100 ?M), aminoguanidine (50 ?M) or tetraethylammonium (TEA, 2 mM) reduced the K{sup +}-induced relaxation only in lead-treated rats. When aortic rings were precontracted with KCl (60 mM/L) or preincubated with TEA (2 mM), 4-aminopyridine (4-AP, 5 mM), iberiotoxin (IbTX, 30 nM), apamin (0.5 ?M) or charybdotoxin (0.1 ?M), the ACh-induced relaxation was more reduced in the lead-treated rats. Additionally, 4-AP and IbTX reduced the relaxation elicited by SNP more in the lead-treated rats. Results suggest that lead treatment promoted NKA and K{sup +} channels activation and these effects might contribute to the preservation of aortic endothelial function against oxidative stress. -- Highlights: ? Increased free radicals production ? Increased Na{sup +}/K{sup +} ATPase activity ? Promotes activation of the K{sup +} channels and reduced vascular reactivity ? These effects preserve endothelial function against oxidative stress. ? Low concentrations constitute environmental cardiovascular risk factor.

Fiorim, Jonaina, E-mail: nanafiorim@hotmail.com [Department of Physiological Sciences, Federal University of Espirito Santo, Vitoria, ES (Brazil)] [Department of Physiological Sciences, Federal University of Espirito Santo, Vitoria, ES (Brazil); Ribeiro Júnior, Rogério Faustino, E-mail: faustino43@oi.com.br [Department of Physiological Sciences, Federal University of Espirito Santo, Vitoria, ES (Brazil); Azevedo, Bruna Fernades, E-mail: brunafernandes.azevedo@gmail.com [Department of Physiological Sciences, Federal University of Espirito Santo, Vitoria, ES (Brazil); Simões, Maylla Ronacher, E-mail: yllars@hotmail.com [Department of Physiological Sciences, Federal University of Espirito Santo, Vitoria, ES (Brazil); Padilha, Alessandra Simão, E-mail: ale_spadilha@yahoo.com.br [Department of Physiological Sciences, Federal University of Espirito Santo, Vitoria, ES (Brazil); Stefanon, Ivanita, E-mail: ivanita@pq.cnpq.br [Department of Physiological Sciences, Federal University of Espirito Santo, Vitoria, ES (Brazil)] [Department of Physiological Sciences, Federal University of Espirito Santo, Vitoria, ES (Brazil); Alonso, Maria Jesus, E-mail: mariajesus.alonso@urjc.es [Departamento de Ciencias de la Salud III, Universidad Rey Juan Carlos, Alcorcón (Spain); Salaices, Mercedes, E-mail: mercedes.salaices@uam.es [Departamento de Farmacología, Universidad Autónoma de Madrid, Instituto de Investigación Hospital Universitario La Paz (IdiPaz) (Spain)] [Departamento de Farmacología, Universidad Autónoma de Madrid, Instituto de Investigación Hospital Universitario La Paz (IdiPaz) (Spain); Vassallo, Dalton Valentim, E-mail: daltonv2@terra.com.br [Department of Physiological Sciences, Federal University of Espirito Santo, Vitoria, ES (Brazil)

2012-07-01T23:59:59.000Z

318

Are synchroton radiation studies (including EXAFS) breakthroughs in structurals studies of metalloproteins?  

Science Journals Connector (OSTI)

Electrons travelling around storage rings in vacuum at close to the speed of light are being exploited to an increasing extent by bioinorganic chemists. These electrons emit intense radiation ranging from the infrared through X-ray regions. The radiation is continuous in energy, pulsed, polarized, and of intensity not otherwise obtainable for comparable time periods. The availability of the synchrotron radiation has elicited an increasing variety of absorption and scattering techniques. The absorption edge, the X-ray Absorption Near Edge Structure (XANES) and the Extended X-ray Absorption Fine Structure (EXAFS) have each been exploited as have scattering techniques. This discussion brings together from four countries (and four synchrotron sources) some of the major proponents and users of synchrotron radiation. The round table will entail short (20–25 minutes) formal presentations by each of the 5 participants in which they will seek not only to expose their own work but also to put it in the context of the full impact of synchrotron radiation studies. Short question periods will follow each talk and a final period will be left for discussion among the panelists, further questions from the audience and summing up. To start the session, Cramer will introduce the synchrotron sources and radiation characteristics, discuss absorption applications to nitrogenase, hemoglobin and cytochrome oxidase and describe some of the future novel ways of exploiting the characteristics of the radiation. Stuhrmann will continue this line by describing the hierarchy of information one gets from absorption and scattering experiments and he will review applications of scattering to such systems as ferritin, hemoglobin and t-RNA. Teo will emphasize the detailed information obtainable from EXAFS and will discuss its application to Fe systems in nitrogenase and 3Fe?3S cluster systems. Bianconi will focus on the information attainable from XANES as compared to EXAFS and will discuss applications of XANES to hemoglobin and calmodulin structure. Finally, Garner will discuss some of the EXAFS analysis protocols and their limits and will analyze recent data from superoxide dismutase and metallothionein Between them our distinguished panelists should cover many of the established and emerging synchrotron techniques as well as their application to systems containing Fe, Cu, Zn, Mo, Ca, Mg, Cs, I and Tb. The panelists and convener are committed to pedagogical presentations, lacking in undefined jargon and abbreviations. We will endeavor to convey an appreciation for the powers and limits of the various techniques. If we do our job well, the answer to the question posed in the title of the Round Table should become obvious to the audience.

E.I. Stiefel

1983-01-01T23:59:59.000Z

319

Cadmium-induced oxidative stress and histological damage in the myocardium. Effects of a soy-based diet  

SciTech Connect (OSTI)

Cd exposure has been associated to an augmented risk for cardiovascular disease. We investigated the effects of 15 and 100 ppm of Cd on redox status as well as histological changes in the rat heart and the putative protective effect of a soy-based diet. Male Wistar rats were separated into 6 groups and treated during 60 days as follows: groups (1), (2) and (3) were fed a casein-based diet; groups (4), (5) and (6), a soy-based diet; (1) and (4) were given tap water; (2) and (5) tap water containing 15 ppm of Cd{sup 2+}; and (3) and (6) tap water containing 100 ppm of Cd{sup 2+}. Serum lipid peroxides increased and PON-1 activity decreased in group (3). Lipoperoxidation also increased in the heart of all intoxicated groups; however protein oxidation only augmented in (3) and reduced glutathione levels diminished in (2) and (3). Catalase activity increased in groups (3) and (6) while superoxide dismutase activity increased only in (6). Glutathione peroxidase activity decreased in groups (3) and (6). Nrf2 expression was higher in groups (3) and (6), and MTI expression augmented in (3). Histological examination of the heart tissue showed the development of hypertrophic and fusion of cardiomyocytes along with foci of myocardial fiber necrosis. The transmission electron microscopy analysis showed profound ultra-structural damages. No protection against tissue degeneration was observed in animals fed the soy-based diet. Our findings indicate that even though the intake of a soy-based diet is capable of ameliorating Cd induced oxidative stress, it failed in preventing cardiac damage. -- Highlights: ? Cd intoxication produces extracellular and ultrastructural damage in the myocardium. ? The intake of a soy-based diet ameliorated Cd-induced oxidative stress. ? Cd-induced myocardial damage wasn't prevented by the intake of a soy-based diet. ? Cd-induced myocardial degeneration may not be caused by oxidative stress generation. ? Histology evaluation is needed to establish the extent of Cd-induced cardiac damage.

Ferramola, Mariana L.; Pérez Díaz, Matías F.F. [Department of Biochemistry and Biological Sciences, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, IMIBIO-SL, CONICET, San Luis (Argentina); Honoré, Stella M.; Sánchez, Sara S. [Department of Development Biology, INSIBIO, National University of Tucumán, CONICET-UNT, Tucumán (Argentina)] [Department of Development Biology, INSIBIO, National University of Tucumán, CONICET-UNT, Tucumán (Argentina); Antón, Rosa I. [Department of Chemistry, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, INQUISAL, CONICET, San Luis (Argentina)] [Department of Chemistry, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, INQUISAL, CONICET, San Luis (Argentina); Anzulovich, Ana C. [Department of Biochemistry and Biological Sciences, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, IMIBIO-SL, CONICET, San Luis (Argentina)] [Department of Biochemistry and Biological Sciences, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, IMIBIO-SL, CONICET, San Luis (Argentina); Giménez, María S., E-mail: mgimenez@unsl.edu.ar [Department of Biochemistry and Biological Sciences, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, IMIBIO-SL, CONICET, San Luis (Argentina)

2012-12-15T23:59:59.000Z

320

Toluene effects on oxidative stress in brain regions of young-adult, middle-age, and senescent Brown Norway rats  

Science Journals Connector (OSTI)

The influence of aging on susceptibility to environmental contaminants is not well understood. To extend knowledge in this area, we examined effects in rat brain of the volatile organic compound, toluene. The objective was to test whether oxidative stress (OS) plays a role in the adverse effects caused by toluene exposure, and if so, if effects are age-dependent. OS parameters were selected to measure the production of reactive oxygen species (NADPH Quinone oxidoreductase 1 (NQO1), NADH Ubiquinone reductase (UBIQ-RD)), antioxidant homeostasis (total antioxidant substances (TAS), superoxide dismutase (SOD), ?-glutamylcysteine synthetase (?-GCS), glutathione transferase (GST), glutathione peroxidase (GPX), glutathione reductase (GRD)), and oxidative damage (total aconitase and protein carbonyls). In this study, Brown Norway rats (4, 12, and 24 months) were dosed orally with toluene (0, 0.65 or 1 g/kg) in corn oil. Four hours later, frontal cortex, cerebellum, striatum, and hippocampus were dissected, quick frozen on dry ice, and stored at ? 80 °C until analysis. Some parameters of OS were found to increase with age in select brain regions. Toluene exposure also resulted in increased OS in select brain regions. For example, an increase in NQO1 activity was seen in frontal cortex and cerebellum of 4 and 12 month old rats following toluene exposure, but only in the hippocampus of 24 month old rats. Similarly, age and toluene effects on glutathione enzymes were varied and brain-region specific. Markers of oxidative damage reflected changes in oxidative stress. Total aconitase activity was increased by toluene in frontal cortex and cerebellum at 12 and 24 months, respectively. Protein carbonyls in both brain regions and in all age groups were increased by toluene, but step-down analyses indicated toluene effects were statistically significant only in 12 month old rats. These results indicate changes in OS parameters with age and toluene exposure resulted in oxidative damage in frontal cortex and cerebellum of 12 month old rats. Although increases in oxidative damage are associated with increases in horizontal motor activity in older rats, further research is warranted to determine if these changes in OS parameters are related to neurobehavioral and neurophysiological effects of toluene in animal models of aging.

Prasada Rao S. Kodavanti; Joyce E. Royland; Judy E. Richards; Jonathan Besas; Robert C. MacPhail

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Activation of protein kinase B (PKB/Akt) and risk of lung cancer among rural women in India who cook with biomass fuel  

SciTech Connect (OSTI)

The impact of indoor air pollution (IAP) from biomass fuel burning on the risk of carcinogenesis in the airways has been investigated in 187 pre-menopausal women (median age 34 years) from eastern India who cooked exclusively with biomass and 155 age-matched control women from same locality who cooked with cleaner fuel liquefied petroleum gas. Compared with control, Papanicolau-stained sputum samples showed 3-times higher prevalence of metaplasia and 7-times higher prevalence of dysplasia in airway epithelial cell (AEC) of biomass users. Immunocytochemistry showed up-regulation of phosphorylated Akt (p-Akt{sup ser473} and p-Akt{sup thr308}) proteins in AEC of biomass users, especially in metaplastic and dysplastic cells. Compared with LPG users, biomass-using women showed marked rise in reactive oxygen species (ROS) generation and depletion of antioxidant enzyme, superoxide dismutase (SOD) indicating oxidative stress. There were 2–5 times more particulate pollutants (PM{sub 10} and PM{sub 2.5}), 72% more nitrogen dioxide and 4-times more particulate-laden benzo(a)pyrene, but no change in sulfur dioxide in indoor air of biomass-using households, and high performance liquid chromatography estimated 6-fold rise in the concentration of benzene metabolite trans,trans-muconic acid (t,t-MA) in urine of biomass users. Metaplasia and dysplasia, p-Akt expression and ROS generation were positively associated with PM and t,t-MA levels. It appears that cumulative exposure to biomass smoke increases the risk of lung carcinogenesis via oxidative stress-mediated activation of Akt signal transduction pathway. -- Highlights: ? Carcinogenesis in airway cells was examined in biomass and LPG using women. ? Metaplasia and dysplasia of epithelial cells were more prevalent in biomass users. ? Change in airway cytology was associated with oxidative stress and Akt activation. ? Biomass users had greater exposure to respirable PM, B(a)P and benzene. ? Cooking with biomass increases cancer risk in the airways via Akt activation.

Roychoudhury, Sanghita; Mondal, Nandan Kumar; Mukherjee, Sayali; Dutta, Anindita; Siddique, Shabana; Ray, Manas Ranjan, E-mail: manasrray@rediffmail.com

2012-02-15T23:59:59.000Z

322

Low Cost SiOx-Graphite and Olivine Materials  

Broader source: Energy.gov (indexed) [DOE]

Sotowa (Showa-Denko) Objective Synthesize and evaluate doped manganese phosphate as low cost cathode material Replace graphite anode with an alternative material that meets the...

323

E-Print Network 3.0 - affecting diatomaceous earth Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

earth is a pale, soft, lightweight rock... adsorption capacity are needed. In Jordan, diatomaceous earth and manganese exist in large quantities Source: Shawabkeh, Reyad...

324

Double perovskite catalysts for oxidative coupling  

DOE Patents [OSTI]

Alkali metal doped double perovskites containing manganese and at least one of cobalt, iron and nickel are useful in the oxidative coupling of alkane to higher hydrocarbons.

Campbell, K.D.

1991-01-01T23:59:59.000Z

325

Cobalt in pore waters of marine sediments  

Science Journals Connector (OSTI)

... . Total' metal digestions and 'leach' extracts were analysed for cobalt and manganese by flameless and flame atomic absorption spec-trometry respectively. The analytical precision of 'total' and ...

David Heggie; Tim Lewis

1984-10-04T23:59:59.000Z

326

High-Performance Thermoelectric Devices Based on Abundant Silicide Materials for Vehicle Waste Heat Recovery  

Broader source: Energy.gov [DOE]

Reports of methods to synthesize single-crystal and poly or nano- crystalline p- and n-type higher manganese silicides to reduce lattice thermal conductivity

327

Mimicking the electron transfer chain in photosystem II with...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

photosynthetic photosystem II, electrons are transferred from the manganese-containing oxygen evolving complex (OEC) to the oxidized primary electron-donor chlorophyll P680*+ by...

328

ZHAO ET AL. VOL. 6 ' NO. 6 ' 54045412 ' 2012 www.acsnano.org  

E-Print Network [OSTI]

Chemical Society Incorporation of Manganese Dioxide within Ultraporous Activated Graphene for High; they currently fill the gap between batteries and conventional electrostatic capacitors.1 On the basis

329

CX-007727: Categorical Exclusion Determination | Department of...  

Broader source: Energy.gov (indexed) [DOE]

support the development of manganese-aluminum bulk powder capable of replacing rare earth elements in permanent magnets that are used in wind turbine generators and electric...

330

California: Geothermal Plant to Help Meet High Lithium Demand...  

Energy Savers [EERE]

technologies that extract battery materials like lithium, manganese, and zinc from geothermal brines. Simbol has the potential to power 300,000-600,000 electric vehicles per...

331

E-Print Network 3.0 - activated clotting time Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

BIOLOGY VOL.2 NO.6 www.acschemicalbiology.org Tolerating Manganese Summary: -shaped patch initiated clotting only half of the time. To examine the mechanism behind this...

332

E-Print Network 3.0 - acetate sedimentation concentration Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

impact on the diversity of archaeal Source: Oak Ridge National Laboratory Fossil Energy Program Collection: Fossil Fuels 91 5. Iron and manganese pools and reduction rates...

333

Studies on the Local State of Charge (SOC) and Underlying Structures...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Studies on High Voltage Lithium Rich MNC Composite Cathodes Investigations of electrode interface and architecture Studies on Lithium Manganese Rich MNC Composite Cathodes...

334

High-Performance Thermoelectric Devices Based on Abundant Silicide...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Reports of methods to synthesize single-crystal and poly or nano- crystalline p- and n-type higher manganese silicides to reduce lattice thermal conductivity...

335

NEES EFRC Poster Session  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

NEES EFRC Poster Session May 8-9 2014, Sandia, Albuquerque, NM 1. Lithographically Patterned GoldManganese Dioxide CoreShell Nanowires for High Power Supercapacitors -...

336

MIMICKING NATURAL PHOTOSYNTHESIS  

Science Journals Connector (OSTI)

MIMICKING NATURAL PHOTOSYNTHESIS ... O2 Evolution from the Manganese?Oxo Cubane Core Mn4O46+:? A Molecular Mimic of the Photosynthetic Water Oxidation Enzyme? ...

MICHAEL FREEMANTLE

1998-10-26T23:59:59.000Z

337

EndNote File  

Science Journals Connector (OSTI)

... Patrick G. Mopper, Kenneth Hernes, Peter J. Mwamba, Vincent L. Mangangu, ... T. David Title Dynamics of nonphotochemical superoxide production in the ...

338

Method for digesting a nitro-bearing explosive compound  

DOE Patents [OSTI]

The present invention is a process wherein superoxide radicals from superoxide salt are used to break down the explosive compounds. The process has an excellent reaction rate for degrading explosives, and operates at ambient temperature and atmospheric pressure in aqueous or non-aqueous conditions. Because the superoxide molecules are small, much smaller than an enzyme molecule for example, they can penetrate the microstructure of plastic explosives faster. The superoxide salt generates reactive hydroxyl radicals, which can destroy other organic contaminants, if necessary, along with digesting the explosive nitro-bearing compound.

Shah, Manish M. (Richland, WA)

2000-01-01T23:59:59.000Z

339

Serotonin 5-HT2B Receptor Blockade Prevents Reactive Oxygen SpeciesInduced Cardiac Hypertrophy in Mice  

E-Print Network [OSTI]

hypertrophy, ie, angiotensin II and isoproterenol infusions in mice. Angiotensin II infusion for 14 days215505) prevented the increase in cardiac superoxide generation and hypertrophy. Similarly, infusion

Boyer, Edmond

340

Role of Trace Elements in Cancer  

Science Journals Connector (OSTI)

...from less than 30 @zg/g,wet weight, to 170 and 50 to 460...were observed in 5 patients in corn plete remission, and values...may be introduced during the milling process. It has been suggested...manganese (1.5 2 @g/g,wet weight) and manganese isprimarily...

Morton K. Schwartz

1975-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Hydrogen Peroxide-Mediated Cytosolic Acidification Is a Signal for Mitochondrial Translocation of Bax during Drug-Induced Apoptosis of Tumor Cells  

Science Journals Connector (OSTI)

...have shown that hydrogen peroxide (H2O2...intracellular production during drug-induced...MATERIALS AND METHODS Cell Lines...Clement MV Hydrogen peroxide-induced...reductive stress?. Methods Enzymol 2002...neutrophil superoxide production. J Immunol Meth...Superoxide and hydrogen peroxide in relation...

Kashif A. Ahmad; Kartini B. Iskandar; Jayshree L. Hirpara; Marie-Veronique Clement; and Shazib Pervaiz

2004-11-01T23:59:59.000Z

342

Role of Reactive Oxygen Metabolites in Crocidolite Asbestos Toxicity to Mouse Macrophages  

Science Journals Connector (OSTI)

...fibers may catalyze the production of hydroxyl radical from Superoxide ani nand hydrogen peroxide generated during...Superoxide ani n(O2' ), hydrogen peroxide (H2O2...monophosphate shunt, production of NAD(P)H, and...cytotoxicity. MATERIALS AND METHODS Reagents Crocidolite...

Lee A. Goodglick and Agnes B. Kane

1986-11-01T23:59:59.000Z

343

Nitrogen Dioxide-Induced Responses in Brassica campestris Seedlings: The Role of Hydrogen Peroxide in the Modulation of Antioxidative Level and Induced Resistance  

Science Journals Connector (OSTI)

This article investigates the responses of Brassica campestris seedlings to an acute level of nitrogen dioxide (NO2) exposure in a plant growth chamber, and examines whether pretreating plants with hydrogen peroxide (H2O2) will alleviate NO2-caused injury. Twenty-eight-day-old B. campestris plants sprayed with 10 mmol L?1 H2O2 aqueous solution (corresponding to approximate 1.0 mg H2O2 per single plant) were exposed to different concentrations of NO2 (0.25, 0.5, 1.0, and 2.0 ?L L?1, respectively) for 24 h under controlled environment. To measure the plant biomass, the plants were fumigated with the same NO2 concentrations as mentioned above for 7 h per day (8.00-15.00) for 7 days. As a control, charcoal filtered air alone was applied. Data were collected on plant biomass, total chlorophyll, photosynthetic rate, stomatal conductance, nitrate and nitrate reductase (NR), antioxidative enzymes, ascorbate (ASA), and malondialdehyde (MDA), immediately after exposure. The results showed that exposure to a moderate dose of NO2 (e.g., 0.25 ?L L?1) had a favorable effect on plants, and the dry weight of the above-ground part increased, whereas the exposure to high NO2 concentrations (e.g., 0.5 ?L L?1 or higher) caused a reduction in the plant biomass and the total chlorophyll, when compared with the control. In addition, at 0.5 ?L L?1 or higher NO2 concentrations, prominent increases in the MDA level and superoxide dismutase (SOD) and NR activities were observed. Exposure to 1 ?L L?1 and higher NO2 resulted in necroses appearing on older leaves, and an increase in catalase (CAT) activity, decrease in ASA content, increased accumulation of NO3, and reduction in photosynthesis, when compared with the controls. No changes were detected in stomatal conductance under NO2 fumigation. The pretreatment with 10 mmol L?1 H2O2 alleviated significantly NO2-caused biomass decrease and photosynthetic inhibition when compared with H2O2-untreated plants. Under NO2 fumigation, further induction in SOD and CAT activities occurred in H2O2 treated plants when compared with H2O2-untreated plants. The effect of NO2 on the ASA and MDA contents was also absent in H2O2-treated plants. However, the H2O2 treatment did not alter the nitrate content and NR activity in plants under NO2 fumigation. The H2O2 treatment caused a lower rate of stomatal conductance. Taken together, these data suggest that fumigation with an acute level of NO2 causes oxidative damage to B. campestris seedlings. The H2O2 pretreatment markedly protects plants against NO2 stress and this may be associated with inducible antioxidative level. NO2 fumigation contributes, at least in part, to the enhanced levels of nitrate in B. campestris leaves.

Chun-yan MA; Xin XU; Lin HAO; Jun CAO

2007-01-01T23:59:59.000Z

344

Molten salt extraction process for the recovery of valued transition metals from land-based and deep-sea minerals  

DOE Patents [OSTI]

A process for extracting transition metals and particularly cobalt and manganese together with iron, copper and nickel from low grade ores (including ocean-floor nodules) by converting the metal oxides or other compositions to chlorides in a molten salt, and subsequently using a combination of selective distillation at temperatures below about 500.degree. C., electrolysis at a voltage not more negative than about -1.5 volt versus Ag/AgCl, and precipitation to separate the desired manganese and cobalt salts from other metals and provide cobalt and manganese in metallic forms or compositions from which these metals may be more easily recovered.

Maroni, Victor A. (Naperville, IL); von Winbush, Samuel (Huntington, NY)

1988-01-01T23:59:59.000Z

345

catena-Poly[[diaquamanganese (II)]-di-{mu}-1,1,3,3-tetracyano-2-ethoxypropenido-{kappa}{sup 4}N{sup 1}:N{sup 3}]. 2}-(2-ethoxy-1,1,3,3-tetracyanopropenido) manganese(II) dihydrate.  

SciTech Connect (OSTI)

The crystal structure of the title compound, [Mn(C{sub 9}H{sub 5}N{sub 4}O){sub 2}(H{sub 2}O){sub 2}], conventionally denoted Mn(EtO-TCA){sub 2}(H{sub 2}O){sub 2}, where EtO-TCA is 2-ethoxy-1,1,3,3-tetracyanopropenide, is described. The EtO-TCA anions bridge Mn{sup II} centers through one of the nitrile N atoms of each of their two dicyanomethanide groups, thus forming dibridged chains along ab. These chains are linked into two-dimensional sheets through hydrogen bonding. The seven-atom bridge, which results in a long Mn...Mn intrachain interaction [9.0044 (4) {angstrom}], as well as the large interchain separations [8.3288 (4) and 8.5220 (4) {angstrom}] prohibit long-range magnetic ordering down to temperatures as low as 1.55 K.

Schlueter, J. A.; Geiser, U.; Materials Science Division

2003-01-01T23:59:59.000Z

346

Rapid detection and profiling of cancer cells in fine-needle aspirates  

Science Journals Connector (OSTI)

...Methods Synthesis of Mn-MNP. Iron (III) acetylacetonate [99.9%, Fe(acac) 3 ], manganese (II) acetylacetonate [Mn(acac) 3 ], oleylamine (70%), 1-octadecene (95...19 Laurent S ( 2008 ) Magnetic iron oxide nanoparticles: Synthesis, stabilization...

Hakho Lee; Tae-Jong Yoon; Jose-Luiz Figueiredo; Filip K. Swirski; Ralph Weissleder

2009-01-01T23:59:59.000Z

347

Notes on the photo-induced characteristics of transition metal-doped and undoped titanium dioxide thin films  

E-Print Network [OSTI]

­gel method using titanium n-butoxide, acetylacetone, and transition metal acetylacetonates as precursors dioxide with transition met- als such as iron [28], cobalt [29], nickel [30], manganese [31], chro- mium

Cirkva, Vladimir

348

STUDIES ON TWO CLASSES OF POSITIVE ELECTRODE MATERIALS FOR LITHIUM-ION BATTERIES  

E-Print Network [OSTI]

Linden, D. , Handbook of Batteries. 2nd ed. 1995, New York:rechargeable lithium batteries. Nature, 2001. 414(6861): p.of rechargeable lithium batteries, I. Lithium manganese

Wilcox, James D.

2010-01-01T23:59:59.000Z

349

Develop high energy high power Li-ion battery cathode materials : a first principles computational study  

E-Print Network [OSTI]

surface phase structural change, the materials thereforerelated phase/structural change nears the material surface.material voltage and change of lattice parameters versus Li concentration. In manganese spinel, phase

Xu, Bo; Xu, Bo

2012-01-01T23:59:59.000Z

350

High Pressure X-Ray Diffraction Study of V. Siruguria,*  

E-Print Network [OSTI]

Place Jussieu, 75252 Paris Cedex 05, France Abstract Uranium manganese germanide, UMn2Ge2, crystallizes intermetallic UT2X2 compounds, where T is a 3d transition metal and X is either Ge or Si. The crystal structure

351

Electronic and magnetic properties of Fe and Mn doped two dimensional hexagonal germanium sheets  

SciTech Connect (OSTI)

Using first principles density functional theory calculations, the present paper reports systematic total energy calculations of the electronic properties such as density of states and magnetic moment of pristine and iron and manganese doped two dimensional hexagonal germanium sheets.

Soni, Himadri R., E-mail: himadri.soni@gmail.com; Jha, Prafulla K., E-mail: himadri.soni@gmail.com [Department of Physics, Maharaja Krishnakumarsinhji Bhavnagar University, Bhavnagar-364001 (India)

2014-04-24T23:59:59.000Z

352

Amperometric Biosensors Based on Carbon Paste Electrodes Modified...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Modified with Nanostructured Mixed-valence Manganese Oxides and Glucose Oxidase."Nanomedicine 1(2):130-135. Authors: X Cui G Liu Y Lin Capabilities: Spectroscopy and Diffraction...

353

MnO2-Based Electrochemical Supercapacitors on Flexible Carbon Substrates  

Science Journals Connector (OSTI)

Manganese dioxide films were grown on large area flexible carbon aerogel substrates. Characterization by x-ray diffraction confirmed ?-MnO2 growth. Three types of films were compared as a function of hexamethylen...

Marko J. Tadjer; Michael A. Mastro; José M. Rojo…

2014-04-01T23:59:59.000Z

354

Size-Selective Lewis Acid Catalysis in a Microporous Metal-Organic Framework with Exposed Mn2+  

E-Print Network [OSTI]

tetrazolate ligands, with a sixth methanol ligand that projects into the pore present only 83% of the time. Site II is bound by just two tetrazolate ligands and accounts for one-ninth of the total manganese

355

JOURNAL DE PHYSIQUE Colloque C8, suppl6ment au n012, Tome 48, dgcembre 1987  

E-Print Network [OSTI]

by Stone Manganese Marine Limited T71 as a "quieter" propeller material for submarines. In addition to good, designated ZA27 by the producer, Noranda Limited 181. This alloy has high as-cast strength, hardness and wear

Boyer, Edmond

356

Serum Molecular Signatures of Weight Change during Early Breast Cancer Chemotherapy  

Science Journals Connector (OSTI)

...patients gaining weight is consistent with an excess of energy expenditure relative to oxidative...injection of GLP-1, oxyntomodulin and lithium chloride in mice detected by manganese-enhanced...cytokine levels. Metabonomics identifies excess energy expenditure pathways perturbed...

Hector C. Keun; Jasmin Sidhu; Dmitry Pchejetski; Jacqueline S. Lewis; Helena Marconell; Michael Patterson; Steven R. Bloom; Vian Amber; R. Charles Coombes; and Justin Stebbing

2009-11-01T23:59:59.000Z

357

Develop high energy high power Li-ion battery cathode materials : a first principles computational study  

E-Print Network [OSTI]

of the Layered, “Li-Excess” Lithium-Ion Battery Electrodeof the Layered, "Li-Excess" Lithium-Ion Battery ElectrodeCATION MIGRATION IN LITHIUM EXCESS NICKEL MANGANESE OXIDES

Xu, Bo; Xu, Bo

2012-01-01T23:59:59.000Z

358

Chemical Weathering of the Silicate Minerals. F. C. Loughnan. Elsevier, New York, 1969. x + 154 pp., illus. $10.50  

Science Journals Connector (OSTI)

...reality of vast rangelands depleted or turned to stony desert through...Unit, Hawaii Department of Health, Honokaa Geological Process...iron, aluminum, manganese, uranium, and phosphates. Loughnan's...Mathematical Series, No. 29. Health and Disease in Farm Animals...

Charles E. Weaver

1970-06-26T23:59:59.000Z

359

Mutation as Cellular Process. A Ciba Foundation Symposium, London, Feb. 1969. G. E. W. Wolstenholme and Maeve O'Connor, Eds. Churchill, London, 1969. xii + 244 pp., illus. $9  

Science Journals Connector (OSTI)

...authors face the reality of vast rangelands depleted or turned to stony desert through mismanagement...TOMICH Research Unit, Hawaii Department of Health, Honokaa Geological Process Chemical...as clay, iron, aluminum, manganese, uranium, and phosphates. Loughnan's book is...

David T. Suzuki

1970-06-26T23:59:59.000Z

360

Subtask 3: Fuel production complex | Center for Bio-Inspired...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

3: Fuel production complex All papers by year Subtask 1 Subtask 2 Subtask 3 Subtask 4 Subtask 5 Trovitch, R.J.(2014)Comparing Well-Defined Manganese, Iron, Cobalt, and Nickel...

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Functional Materials for Energy | ornl.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Materials Characterization Chemical and Morphological Changes of High Voltage Lithium-Manganese Rich Cathodes with Cycling August 26, 2014 Top panels (a)-(d): 2D images Mn K edge...

362

The Center for International Earth Science Information Network (CIESIN) is a data  

E-Print Network [OSTI]

to devise innovative strategies to protect the future of our planet. www.earth.columbia.edu Programs scientific information on the health effects, geochemistry, and remediation of arsenic and manganese

Columbia University

363

Absorption and retention of different chemical forms of trace minerals by mature horses  

E-Print Network [OSTI]

This study was undertaken to compare the absorption and retention of copper, manganese and zinc when supplemented to the diet in the form of oxide, sulfate or organic-chelate mineral supplements. Six mature Miniature Horses were used in a...

Wagner, Elizabeth Lynn

2012-06-07T23:59:59.000Z

364

Evaporation behavior of Hastelloy-X alloys in simulated very high temperature reactor environments  

SciTech Connect (OSTI)

A sequential analysis was made on the material degradations during exposure of nickel-base corrosionresistant austenitic alloys to simulated very high temperature reactor environments. The materials tested were two modified versions of Hastelloy-X in terms of both increased manganese content for improved compatibility and decreased manganese content for possible adverse effects. Quantitative analysis of the specimens after exposure for 1000 h at several temperature steps from 850 to 1050/sup 0/C have revealed the temperature-dependent aspects of the processes including the depletion of chromium and manganese due to oxidation, evaporation, and carbon transfer into and/or from the materials. The material with enriched manganese, developed and specified as Hastelloy-XR, showed enhanced resistance to loss of chromium in terms of both oxidation and evaporation.

Shindo, M.; Kondo, T.

1984-08-01T23:59:59.000Z

365

Process for removing technetium from iron and other metals  

DOE Patents [OSTI]

A process for removing technetium from iron and other metals comprises the steps of converting the molten, alloyed technetium to a sulfide dissolved in manganese sulfide, and removing the sulfide from the molten metal as a slag. 4 figs.

Leitnaker, J.M.; Trowbridge, L.D.

1999-03-23T23:59:59.000Z

366

NiMnOx/C: A Non-noble Ethanol-Tolerant Catalyst for Oxygen Reduction in Alkaline Exchange Membrane DEFC  

Science Journals Connector (OSTI)

A non-noble oxygen reduction catalyst based on nickel?manganese oxide supported on high-surface area carbon has been synthesized by a mild hydrothermal treatment, resulting in nanocrystalline needles. Cyclic volt...

Amanda C. Garcia; Jose J. Linares; Marian Chatenet; Edson A. Ticianelli

2014-01-01T23:59:59.000Z

367

Electric Resistance Welded Steels for Normalized N-80 Oil and Gas Well Tubulars  

Science Journals Connector (OSTI)

This paper reports the development and successful commercialization of a manganese-molybdenum steel for use in the production of normalized electric resistance welded N-80 casing and tubing. The...

David L. Sponseller; Thomas B. Cox; Evan J. Vineberg

1984-06-01T23:59:59.000Z

368

Metal phthalocyanine catalysts  

DOE Patents [OSTI]

As a new composition of matter, alkali metal or ammonium or tetraalkylammonium diazidoperfluorophthalocyanatoferrate. Other embodiments of the invention comprise compositions wherein the metal of the coordination complex is cobalt, manganese and chromium.

Ellis, Jr., Paul E. (Downingtown, PA); Lyons, James E. (Wallingford, PA)

1994-01-01T23:59:59.000Z

369

Published online 3 October 2002 Electrostatics and proton transfer in photosynthetic  

E-Print Network [OSTI]

where YZ acts as a hydro- gen acceptor for bound water. Only in manganese (Mn) depleted PSII by Mn4/2H2O in micro- to milliseconds. By sequential absorption of four quanta, causing one electron

Steinhoff, Heinz-Jürgen

370

Melatonin Reduces Oxidative Stress Induced by Chronic Exposure of Microwave Radiation from Mobile Phones in Rat Brain  

Science Journals Connector (OSTI)

......production of free radicals ad lipid peroxidation can lead to gout and mutagenesis. Superoxide anion, hydrogen peroxide and hydroxyl...oxidase reaction have therapeutical application in treating of gout and hepatic injury.40) In this animal model application of......

Dusan Sokolovic; Boris Djindjic; Jelenka Nikolic; Gordana Bjelakovic; Dusica Pavlovic; Gordana Kocic; Dejan Krstic; Tatjana Cvetkovic; Voja Pavlovic

2008-11-01T23:59:59.000Z

371

Production of Hydrogen Peroxide by Murine Epidermal Keratinocytes following Treatment with the Tumor Promoter 12-O-Tetradecanoylphorbol-13-acetate  

Science Journals Connector (OSTI)

...measurement of hydrogen peroxide production at the 10...biochemical methods for ROI detection...intracellular hydrogen peroxide levels...A sensitive method for the estimation of hydrogen peroxide in...nism: the production of Superoxide...

Fredika M. Robertson; Andrew J. Beavis; Tatiana M. Oberyszyn; Sean M. O'Connell; Anthea Dokidos; Debra L. Laskin; Jeffrey D. Laskin; and John J. Reiners, Jr.

1990-09-15T23:59:59.000Z

372

Decreased Mitochondrial Nitric Oxide Synthase Activity and Hydrogen Peroxide Relate Persistent Tumoral Proliferation to Embryonic Behavior  

Science Journals Connector (OSTI)

...involves the production of superoxide...O2 ) and hydrogen peroxide...pathways for NO production and utilization...MATERIALS AND METHODS Experimental...assessed by Lowry method. For transmission...Mitochondrial Production of Hydrogen Peroxide...

Soledad Galli; Mariana Inés Labato; Elisa Bal de Kier Joffé; María Cecilia Carreras; and Juan José Poderoso

2003-10-01T23:59:59.000Z

373

Increased Expression of Mitochondrial Peroxiredoxin-3 (Thioredoxin Peroxidase-2) Protects Cancer Cells Against Hypoxia and Drug-Induced Hydrogen Peroxide-Dependent Apoptosis1 CA52995 and CA772049.  

Science Journals Connector (OSTI)

...increased H2O2 production. The results...Materials and Methods Chemicals...Determination of the production of superoxide radicals and hydrogen peroxide in mitochondria. Methods Enzymol...species. Methods Enzymol...drug-induced hydrogen peroxide-dependent...

Larisa Nonn; Margareta Berggren; and Garth Powis

2003-07-01T23:59:59.000Z

374

Phase I Study of Pharmacological and Immunological Effects of Human Lymphoblastoid Interferon Given to Patients with Cancer  

Science Journals Connector (OSTI)

...cells migrated per 10 oil immersion fields) was expressed as...Superoxide ani n (Cv) production in response to phorbol...and in fact exerted a cumulative fatiguing effect...cells migrated per oil immersion field; polarization, 38...

John Laszlo; Andrew T. Huang; Wayne D. Brenckman; Christina Jeffs; Hillel Koren; George Cianciolo; Richard Metzgar; William Cashdollar; Edwin Cox; C. E. Buckley III; C. Y. Tso; and Virgil S. Lucas, Jr.

1983-09-01T23:59:59.000Z

375

Resveratrol Inhibits Drug-Induced Apoptosis in Human Leukemia Cells by Creating an Intracellular Milieu Nonpermissive for Death Execution  

Science Journals Connector (OSTI)

...hydrogen peroxide production. These data...mitochondrial hydrogen peroxide production, thereby...MATERIALS AND METHODS Determination...detection. Methods Enzymol...superoxide to hydrogen peroxide and...hydrogen peroxide production. These data...

Kashif Adil Ahmad; Marie-Veronique Clement; Ismail Muhamad Hanif; and Shazib Pervaiz

2004-02-15T23:59:59.000Z

376

Effect of gamma interferon on hydrogen peroxide production by cultured mouse peritoneal macrophages.  

Science Journals Connector (OSTI)

...increase in hydrogen peroxide production and only in...assayed by the method of Pick and...Immunol. Methods 38:161-170...superoxide and hydrogen peroxide production by macrophages...Immunol. Methods 46:211-226...

A K Sharp; D K Banerjee

1986-11-01T23:59:59.000Z

377

Regulation of the Catalase Gene Promoter by Sp1, CCAAT-recognizing Factors, and a WT1/Egr-related Factor in Hydrogen Peroxide-resistant HP100 Cells  

Science Journals Connector (OSTI)

...superoxide anion, hydrogen peroxide...11 , 12) . Production of H2O2 in...MATERIALS AND METHODS Cell Culture...Nose K. Production of hydrogen peroxide by...Yamada M. High production of catalase in hydrogen peroxide-resistant...

Mitsuru Nenoi; Sachiko Ichimura; Kazuei Mita; Osami Yukawa; and Iain L. Cartwright

2001-08-01T23:59:59.000Z

378

Production of Thymine Glycols in DNA by N-Hydroxy-2-naphthylamine As Detected by a Monoclonal Antibody  

Science Journals Connector (OSTI)

...71-75, January 1986] Production of Thymine Glycols in...have quantitated the production of thymine glycols in...dismutase, which break down hydrogen peroxide and superox...respectively, inhibited the production of this base damage...we have used this method to measure the production...

Motohisa Kaneko and Steven A. Leadon

1986-01-01T23:59:59.000Z

379

Victorin Induction of an Apoptotic/Senescenceâ??like Response in Oats  

Science Journals Connector (OSTI)

...for signal transduction studies were purchased from Sigma...Applied Biosystems, Foster City, CA) operated...Gelprint 2000i imaging system (BioPhotronics, Ann...dismutases Shain L. Wheeler H. Production of ethylene...counteraction by cytokinin Wheeler H. Black H.S. Change...

Duroy A. Navarre; Thomas J. Wolpert

380

The Risk Assessment Information System  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Condensed Toxicity Summary for MANGANESE Condensed Toxicity Summary for MANGANESE NOTE: Although the toxicity values presented in these toxicity profiles were correct at the time they were produced, these values are subject to change. Users should always refer to the Toxicity Value Database for the current toxicity values. July 1995 Prepared by A. A. Francis and C. Forsyth, Chemical Hazard Evaluation Group, Biomedical and Environmental Information Analysis Section, Health Sciences Research Division, *, Oak Ridge, Tennessee Prepared for OAK RIDGE RESERVATION ENVIRONMENTAL RESTORATION PROGRAM *Managed by Lockheed Martin Energy Systems, Inc., for the U.S. Department of Energy under Contract No. DE-AC05-84OR21400 Manganese is an essential trace element in humans that can elicit a variety of serious toxic responses upon prolonged exposure to elevated

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

It's Elemental - The Element Iron  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Manganese Manganese Previous Element (Manganese) The Periodic Table of Elements Next Element (Cobalt) Cobalt The Element Iron [Click for Isotope Data] 26 Fe Iron 55.845 Atomic Number: 26 Atomic Weight: 55.845 Melting Point: 1811 K (1538°C or 2800°F) Boiling Point: 3134 K (2861°C or 5182°F) Density: 7.874 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 4 Group Number: 8 Group Name: none What's in a name? From the Anglo-Saxon word iron. Iron's chemical symbol comes from the Latin word for iron, ferrum. Say what? Iron is pronounced as EYE-ern. History and Uses: Archaeological evidence suggests that people have been using iron for at least 5000 years. Iron is the cheapest and one of the most abundant of all metals, comprising nearly 5.6% of the earth's crust and nearly all of the

382

Chemical-looping combustion of solid fuels in a 10 kW reactor system using natural minerals as oxygen carrier  

Science Journals Connector (OSTI)

Abstract Chemical-looping combustion (CLC) is an unmixed combustion concept where fuel and combustion air are kept separate by means of an oxygen carrier, and the CO2 capture is inherently achieved. This work presents findings from a continuously operated 10 kW pilot for solid fuels. Using petcoke as fuel, the following oxygen carriers are compared: (a) ilmenite, (b) ilmenite + lime, (c) manganese ore, and (d) manganese ore + lime. Compared to ilmenite, the use of manganese ore as oxygen carrier greatly enhanced the rate of gasification. By adding lime particles to the Mn ore, performance improved further. The addition of lime to ilmenite had a small beneficial effect on gas conversion and char gasification rate.

Carl Linderholm; Anders Lyngfelt; Cristina Dueso

2013-01-01T23:59:59.000Z

383

Intramolecular ET in Ru-Modified MnCyt c  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tetraammine(L)ruthenium(III)-Modified Tetraammine(L)ruthenium(III)-Modified Manganocytochromes c Ji Sun and James F. Wishart Inorg. Chem. 37, 1124-1126 (1998) [Find paper at ACS Publications] or use ACS Articles on Request Abstract: Manganese-substituted horse heart cytochrome c was prepared by replacing the iron in the heme group according to established methods. The resulting manganicytochrome c was subsequently modified at histidine-33 with three ruthenium complexes trans-(NH3)4(L)Ru-His33, where L = NH3, pyridine or isonicotinamide. Proof of correct derivatization was obtained by atomic absorption analysis of manganese and ruthenium, differential pulse voltammetry and electrospray mass spectroscopy. Manganese(II)-to-ruthenium(III) intramolecular electron transfer rates were measured as a function of temperature by pulse radiolysis, using oxidation

384

Quantitative room-temperature mineralization of airborne formaldehyde using  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Quantitative room-temperature mineralization of airborne formaldehyde using Quantitative room-temperature mineralization of airborne formaldehyde using manganese oxide catalysts Title Quantitative room-temperature mineralization of airborne formaldehyde using manganese oxide catalysts Publication Type Journal Article Year of Publication 2011 Authors Sidheswaran, Meera A., Hugo Destaillats, Douglas P. Sullivan, Joern Larsen, and William J. Fisk Journal Applied Catalysis B - Environmental Issue 107 Pagination 34-41 Date Published 2011 Keywords commercial building ventilation & indoor environmental quality group, commercial building ventilation and indoor environmental quality group, energy analysis and environmental impacts department, indoor environment department, indoor environment group DOI 10.1016/j.apcatb.2011.06.032 Attachment Size

385

Argonne CNM Highlight: Exploring the limits of antiferromagnetism in  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

spin structure of manganese monolayer ; (Top) Schematic of the spin structure of the Mn monolayer on W(110) (6-nm repeat structure). (a) Topography and (b) differential conductance at 40 K. (Inset) High-resolution topographic data taken with a spin-sensitive tip; stripe contrast is related to the degree of antiferromagnetic order. Exploring the limits of antiferromagnetism in nanostructured materials Researchers in the Electronic & Magnetic Materials & Devices Group and at Politecnico di Milano in Italy explored the limits of antiferromagnetism in a nanostructured material for the first time, measuring the temperature required to support antiferromagnetic order in atomic monolayers of manganese on tungsten as the dimensions of the structures are reduced.

386

SSRL HEADLINES August 2005  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2 August, 2005 2 August, 2005 __________________________________________________________________________ Contents of this Issue: Science Highlight - The Mighty Manganese Oxides Secretary of Energy Visits SLAC DOE BES Director of Materials Science Meets with SSRL and GLAM Scientists SSRL's Scientific Advisory Committee and Proposal Review Panel Convenes User Operations Update Update on SSRL Beam Lines and Techniques Nominations for SSRLUOEC and Registration for the Annual SSRL Users' Meeting & Workshops, October 15-19 Students and Teachers Visit SLAC August 10 4th Stanford-Berkeley Summer School for Physical Science Held June 2005 Got News? User Administration Update __________________________________________________________________________ 1. Science Highlight - The Mighty Manganese Oxides

387

The distribution of potentially toxic heavy metals in the sediments of San Antonio Bay and the northwest Gulf of Mexico  

E-Print Network [OSTI]

Gulf of Mexico are those of Tieh and Pyle (1972) and Holmes (1974). Included in the Tieh and Pyle (1972) study were iron, manganese, nickel, and zinc analyses 12 and a conclusion that, excluding manganese and zinc, there is littl. e difference... yielded 61% Fe, 89% Mn, and 65% Cz wi. th 12 N HC1 (Fukai, 1965). Jones (1973) found that approximately 75% of the zinc& 60% of the cadmium, and most all the lead and copper were removed by a rigorous nitric acid and subsequent HNO -HC1 treat- 3 ment...

Trefry, John Harold

1974-01-01T23:59:59.000Z

388

The polarographic microdetermination of boron  

E-Print Network [OSTI]

? ment, has been demonstrated by the ferrous metals industry. Minute amounts of boron have been employed to increase the hardenability of steel. For instance, 0.003 % boron may be substituted for 0.3 % chromium, 0.2 % manganese, 0.12 % vanadium or 0...? ment, has been demonstrated by the ferrous metals industry. Minute amounts of boron have been employed to increase the hardenability of steel. For instance, 0.003 % boron may be substituted for 0.3 % chromium, 0.2 % manganese, 0.12 % vanadium or 0...

Peacock, Dixon Williams

2013-10-04T23:59:59.000Z

389

Autogenous electrolyte, non-pyrolytically produced solid capacitor structure  

DOE Patents [OSTI]

A solid electrolytic capacitor having a solid electrolyte comprising manganese dioxide dispersed in an aromatic polyamide capable of further cure to form polyimide linkages, the solid electrolyte being disposed between a first electrode made of valve metal covered by an anodic oxide film and a second electrode opposite the first electrode. The electrolyte autogenously produces water, oxygen, and hydroxyl groups which act as healing substances and is not itself produced pyrolytically. Reduction of the manganese dioxide and the water molecules released by formation of imide linkages result in substantially improved self-healing of anodic dielectric layer defects.

Sharp, Donald J. (Albuquerque, NM); Armstrong, Pamela S. (Abingdon, MD); Panitz, Janda Kirk G. (Edgewood, NM)

1998-01-01T23:59:59.000Z

390

Autogenous electrolyte, non-pyrolytically produced solid capacitor structure  

DOE Patents [OSTI]

A solid electrolytic capacitor is described having a solid electrolyte comprising manganese dioxide dispersed in an aromatic polyamide capable of further cure to form polyimide linkages, the solid electrolyte being disposed between a first electrode made of valve metal covered by an anodic oxide film and a second electrode opposite the first electrode. The electrolyte autogenously produces water, oxygen, and hydroxyl groups which act as healing substances and is not itself produced pyrolytically. Reduction of the manganese dioxide and the water molecules released by formation of imide linkages result in substantially improved self-healing of anodic dielectric layer defects. 2 figs.

Sharp, D.J.; Armstrong, P.S.; Panitz, J.K.G.

1998-03-17T23:59:59.000Z

391

Metallocarboranes That Exhibit Novel Chemical Features  

Science Journals Connector (OSTI)

...PI-PHOSPHACARBOLLYL DERIVATIVES OF MANGANESE, IRON, AND COBALT, INORGANIC CHEMISTRY 9...diffraction study (7) proved that the iron atom in [(3)-1,2-B1,C...employed (29). Reaction of Ni(II) acetylacetonate, Ni(acac), , with the 1, 2-dimethyl...

M. Frederick Hawthorne; Gary B. Dunks

1972-11-03T23:59:59.000Z

392

Nanoporous BiVO4 Photoanodes with Dual-Layer Oxygen Evolution Catalysts for Solar Water Splitting  

Science Journals Connector (OSTI)

...bismuth vanadate photoanode coupled with an iron oxyhydroxide oxygen evolution catalyst . J. Am. Chem. Soc...R. M. Cornell, U. Schwertmann, The Iron Oxides: Structure, Properties, Reactions...Sherman D. M. , Electronic structures of iron(III) and manganese(IV) (hydr)oxide...

Tae Woo Kim; Kyoung-Shin Choi

2014-02-28T23:59:59.000Z

393

The Chemistry and Applications of Metal-Organic Frameworks  

Science Journals Connector (OSTI)

...Anson C. E. Powell A. K. , Iron(II) formate [Fe...carbon dioxide capture in an iron-based sodalite-type...IRMOF-3 with a manganese(II) acetylacetonate complex . Chem. Commun. 47...Postsynthetic modifications of iron-carboxylate nanoscale metal-organic...

Hiroyasu Furukawa; Kyle E. Cordova; Michael O’Keeffe; Omar M. Yaghi

2013-08-30T23:59:59.000Z

394

Cyano- and polycyanometallo-porphyrins as catalysts for alkane oxidation  

DOE Patents [OSTI]

New compositions of matter comprising cyano-substituted metal complexes of porphyrins are catalysts for the oxidation of alkanes. The metal is iron, chromium, manganese, ruthenium, copper or cobalt. The porphyrin ring has cyano groups attached thereto in meso- and/or [beta]-pyrrolic positions.

Ellis, P.E. Jr.; Lyons, J.E.

1993-05-18T23:59:59.000Z

395

Nitrated metalloporphyrins as catalysts for alkane oxidation  

DOE Patents [OSTI]

Compositions of matter comprising nitro-substituted metal complexes of porphyrins are catalysts for the oxidation of alkanes. The metal is iron, chromium, manganese, ruthenium, copper or cobalt. The porphyrin ring has nitro groups attached thereto in meso and/or [beta]-pyrrolic positions.

Ellis, P.E. Jr.; Lyons, J.E.

1994-01-18T23:59:59.000Z

396

Cyano- and polycyanometallo-porphyrins as catalysts for alkane oxidation  

DOE Patents [OSTI]

New compositions of matter comprising cyano-substituted metal complexes of porphyrins are catalysts for the oxidation of alkanes. The metal is iron, chromium, manganese, ruthenium, copper or cobalt. The porphyrin ring has cyano groups attached thereto in meso and/or [beta]-pyrrolic positions.

Ellis, P.E. Jr.; Lyons, J.E.

1995-01-17T23:59:59.000Z

397

Oxidative Transformation of Triclosan and Chlorophene by  

E-Print Network [OSTI]

Oxidative Transformation of Triclosan and Chlorophene by Manganese Oxides H U I C H U N Z H A N G of Technology, Atlanta, Georgia 30332 The antibacterial agents triclosan (5-chloro-2-(2,4- dichlorophenoxy(-MnO2 andMnOOH)yielding MnII ions. Both the initial reaction rate and adsorption of triclosan to oxide

Huang, Ching-Hua

398

Laser-excited atomic fluorescence spectrometry in a graphite furnace with an  

E-Print Network [OSTI]

Laser-excited atomic fluorescence spectrometry in a graphite furnace with an optical parametric oscillator laser for sequential multi-element determination of cadmium, cobalt, lead, manganese and thallium, for the ® rst time, that solid-state lasers required for analysis (ml or mg) and the technique has direct based

Michel, Robert G.

399

California Geothermal Power Plant to Help Meet High Lithium Demand  

Broader source: Energy.gov [DOE]

Ever wonder how we get the materials for the advanced batteries that power our cell phones, laptops, and even some electric vehicles? The U.S. Department of Energy's Geothermal Technologies Program (GTP) is working with California's Simbol Materials to develop technologies that extract battery materials like lithium, manganese, and zinc from geothermal brines produced during the geothermal production process.

400

1. INTRODUCTION At Falconbridge Nikkelverk in Kristiansand, Norway,  

E-Print Network [OSTI]

, even if they are quite frequent in chemical process industry (e.g. purification processes and waste-water in an electrolyte purification plant, where impurities like lead and manganese are removed by chemical precipitation of the electrolyte purification plant at Falconbridge Nikkelverk in Kristiansand, Norway. The process including

Foss, Bjarne A.

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Method for inhibiting alkali metal corrosion of nickel-containing alloys  

DOE Patents [OSTI]

Structural components of nickel-containing alloys within molten alkali metal systems are protected against corrosion during the course of service by dissolving therein sufficient aluminum, silicon, or manganese to cause the formation and maintenance of a corrosion-resistant intermetallic reaction layer created by the interaction of the molten metal, selected metal, and alloy.

DeVan, Jackson H. (Oak Ridge, TN); Selle, James E. (Westminster, CO)

1983-01-01T23:59:59.000Z

402

Lignin-degrading peroxidases in Polyporales: an evolutionary survey based on 10 sequenced genomes  

E-Print Network [OSTI]

Lignin-degrading peroxidases in Polyporales: an evolutionary survey based on 10 sequenced genomes genes from the manganese peroxidase (MnP), lignin peroxidase (LiP) and versatile peroxidase (VP. Incorporation of an exposed tryptophan residue involved in oxidative degradation of lignin in a short Mn

Hibbett, David S.

403

Molecular Evolution and Diversity of Lignin Degrading Heme Peroxidases in the Agaricomycetes  

E-Print Network [OSTI]

Molecular Evolution and Diversity of Lignin Degrading Heme Peroxidases in the Agaricomycetes Ingo peroxidases, including the lignin degrading enzymes manganese per- oxidase (MnP), lignin peroxidase (Li Lignin peroxidase Á Versatile peroxidase Á Lignin degradation Á Agaricomycetes Á Fungi Introduction Heme

Hibbett, David S.

404

Growth of anisotropic one-dimensional ZnS nanostructures{ Daniel Moore and Zhong L. Wang*  

E-Print Network [OSTI]

is the most stable structure for CdS and CdSe and the other II­VI School of Materials Science and Engineering, and nano- combs.7,10,16­26 Recently, ZnS nanobelts have been doped with manganese for possible application

Wang, Zhong L.

405

Alternating Current Driven Electroluminescence from ZnSe/ZnS:Mn/  

E-Print Network [OSTI]

phosphor impurity dopants in ZnSe or other wide band gap host nanocrystals. Lumines- cence of CdS of alternating current thin-film electroluminescent (AC-TFEL) devices using phosphor-doped nanocrystals-TFEL devices consist of a phosphor layer, such as manganese-doped zinc sulfide (ZnS:Mn), vertically sandwiched

406

This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research  

E-Print Network [OSTI]

inventory, Mn(II) is being treated at more than 700 mine sites in Appalachia (60% of sites) and most coal's personal copy Characterization of manganese oxide precipitates from Appalachian coal mine drainage Editorial handling by Dr. R. Fuge a b s t r a c t The removal of Mn(II) from coal mine drainage (CMD

Burgos, William

407

Materials Science Forum, Vols. 539543 (2007) 611. Online available at: http://www.scientific.net  

E-Print Network [OSTI]

://www.scientific.net Copyright 2006 Trans Tech Publications, Switzerland Strong Ferritic­Steel Welds H. K. D. H. Bhadeshia University of Cambridge Materials Science and Metallurgy Pembroke Street, Cambridge CB2 3QZ, U.K. www of the synergy between manganese and nickel is discussed in the light of recent high­resolution experiments

Cambridge, University of

408

t e n t i p s f o r your private  

E-Print Network [OSTI]

potential contamination sources, such as chemical storage, oil tanks, and septic tanks. If you have a septic residue Hardness Water tastes salty Chloride, sodium, TDS* Odor of gas / fuel VOCs** Pin hole leaks / blue operations Nitrate, coliform bacteria, pesticides Coal mining pH, iron, manganese Gas drilling Sodium

Liskiewicz, Maciej

409

Jahresbericht 2010 / Internet Seite 1 von 18 Anhang zum Eawag-Jahresbericht 2010 nur Internet  

E-Print Network [OSTI]

and implications for intra-country virtual water trade in Iran Schulin R. Abbaspour Karim, Yang Hong ETH Zürich 18834 Forster Dionys Roland Schertenleib Gresch Markus Modeling Reactive Flows in Urban Water, iron, and manganese fluxes at the sediment-water interface in lakes and reservoirs Little John C. Wüest

Wehrli, Bernhard

410

Heavy metal concentrations in shrimp, crab, and sediment obtained from AD-Dammam sewage outfall area  

SciTech Connect (OSTI)

The concentrations of cadmium (Cd), Chromium (Cr), cobalt (Co), copper (Cu), manganese (Mn), lead (Pb), nickel (Ni), and zinc (Zn) were determined in the acid digest of sediment, shrimp and crab from a heavily polluted area using Perkin-Elmer Atomic Absorption Spectrophotometer Model 560 and Graphite Furnace Model HGA 500. Results are presented in a table.

Sadiq, M.; Zaidi, T.H.; Hoda, A.; Mian, A.A.

1982-09-01T23:59:59.000Z

411

Process for the production of hydrogen and carbonyl sulfide from hydrogen sulfide and carbon monoxide using a metal boride, nitride, carbide and/or silicide catalyst  

SciTech Connect (OSTI)

Hydrogen and carbonyl sulfide are produced by a process comprising contacting gaseous hydrogen sulfide with gaseous carbon monoxide in the presence of a metal boride, carbide, nitride and/or silicide catalyst, such as titanium carbide, vanadium boride, manganese nitride or molybdenum silicide.

McGuiggan, M.F.; Kuch, P.L.

1984-05-08T23:59:59.000Z

412

The Orientation Distributions of Lines, Surfaces, and Interfaces around Three-Phase Boundaries in Solid Oxide Fuel Cell Cathodes  

E-Print Network [OSTI]

in Solid Oxide Fuel Cell Cathodes Shen J. Dillon, Lam Helmick,§,¶ Herbert M. Miller,§ Lane Wilson in a multiphase ceramic material. I. Introduction THE active cathode regions of many solid oxide fuel cells (SOFCs of yttria-stabilized zirconia and lanthanum strontium manganese oxide, both before and after mild

Rohrer, Gregory S.

413

A low-temperature neutron diffraction study of Mn12-acetate  

Science Journals Connector (OSTI)

The low-temperature structure of the title dodecanuclear mixed-valence manganese carboxylate, [Mn12O12(CD3COO)16(H2O)4]·2CD3COOH·4H2O, is similar to the room-temperature structure, differing by a small change in the configuration of one of the coordinated acetate groups, related to additional hydrogen bonding.

Langan, P.

2001-08-09T23:59:59.000Z

414

Process for decomposing lignin in biomass  

SciTech Connect (OSTI)

A mild inexpensive process for treating lignocellulosic biomass involves oxidative delignification of wood using an aqueous solution prepared by dissolving a catalytic amount of manganese (III) acetate into water and adding hydrogen peroxide. Within 4 days and without agitation, the solution was used to convert poplar wood sections into a fine powder-like delignified, cellulose rich materials that included individual wood cells.

Rector, Kirk Davin; Lucas, Marcel; Wagner, Gregory Lawrence; Kimball, David Bryan; Hanson, Susan Kloek

2014-10-28T23:59:59.000Z

415

MOBILIZATION, POISONING, AND FILTRATION OF F-CANYON TANK 804 SLUDGE  

SciTech Connect (OSTI)

The Savannah River Site (SRS) Deactivation and Decommissioning (SDD) Organization is evaluating options to disposition the F-Canyon 800 series underground tanks (including removal of the sludge heels from these tanks) and requested assistance from Savannah River National Laboratory (SRNL) personnel to develop methods to effectively mobilize the sludge from these tanks (i.e., Tanks 804, 808, and 809). Because of the high plutonium content in Tank 804 (estimated to be as much as 1500 g), SDD needs to add a neutron poison to the sludge. They considered manganese and boron as potential poisons. Because of the large amount of manganese needed and the very slow filtration rate of the sludge/manganese slurry, SDD requested that SRNL investigate the impact of using boron rather than manganese as the poison. SRNL performed a series of experiments to help determine the disposal pathway of the material currently located in Tank 804. The objectives of this work are: (1) Determine the mobility of Tank 804 sludge when mixed with 10-15 parts sodium hydroxide as a function of pH between 10 and 14. (2) Determine the solubility of boron in sodium hydroxide solution with a free hydroxide concentration between 1 x 10{sup -4} and 2.0 M. (3) Recommend a filter pore size for SDD such that the filtrate contains no visible solids. (4) Determine whether a precipitate forms when the filtrate pH is adjusted to 12, 7, or 2 with nitric acid.

Poirier, M; Thomas Peters, T; Samuel Fink, S

2006-05-04T23:59:59.000Z

416

Evidence for catalytic water oxidation by a dimanganese tetrakis-Schiff base macrocycle  

E-Print Network [OSTI]

have been synthesized to mimic the structure of the Oxygen Evolving Complex (OEC), a Mn4OxCa cluster to the manganese centers by a l-carboxylato axial ligand in an analogous Schiff base complex [MnII 2LAc]+ lowers Mn(II) [17]. These macrocycles provided a planar N4O2 coordination environment for two metal centers

Dinolfo, Peter H.

417

DOI: 10.1126/science.1183670 , 633 (2010);328Science  

E-Print Network [OSTI]

. Crystal structures of photo- system II (30) reveal that TyrZ lies between the oxygen-evolving center, 29), which oxidizes the manganese cluster and leads to the synthesis of molecular oxygen from water the spontaneous formation of tyrosine radicals in an ancient reaction center, thereby creating the chemical

Amaya, Enrique

418

4.4 Nanoscale: Mineral Weathering Boundary RI Dorn, Arizona State University, Tempe, AZ, USA  

E-Print Network [OSTI]

of more intense dissolution are seen as pits on the scale of micrometers. Heavy metal scavenging Iron and manganese oxides and hydroxides scavenge heavy metals such as zinc, copper, and lead. High in mineral weathering, silt production, rock coating behavior, geochemical pollution, thermal weathering from

Dorn, Ron

419

Registered Charity Number 207890 Accepted Manuscript  

E-Print Network [OSTI]

intensively studied as a promising cathode material1-4 for the next generation of lithium-ion batteries cathode materials by using manganese phosphate instead of iron phosphate 3, 10 . Despite the recent as active material in lithium battery. This is due to the fact that it shows much lower effective energy

Paris-Sud XI, Université de

420

Mesoporous composite cathode materials prepared from inverse micelle structures for high  

E-Print Network [OSTI]

active materials in LIBs. Manganese oxide-based compounds are particularly attrac- tive as cathodes owingMesoporous composite cathode materials prepared from inverse micelle structures for highCoO2) is the most common active material.1 However, since natural deposits of cobalt are scarce

Cao, Guozhong

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Regulation of Yeast H+-ATPase by Protein Kinases Belonging to a Family Dedicated to Activation of Plasma Membrane Transporters  

Science Journals Connector (OSTI)

...cations, including sodium, lithium, manganese, tetramethylammonium...exhibited reduced uptake of lithium and methylammonium. Ptk2 and...concentrations from 0.8 to 6 mM and an excess Mg over ATP of 5 mM (). The...the tolerance to sodium and lithium caused by the ptk2 mutation...

Alain Goossens; Natalia de la Fuente; Javier Forment; Ramon Serrano; Francisco Portillo

2000-10-01T23:59:59.000Z

422

Phase Transition Disappearance in Li1+?Mn2-?O4 Depended on Lithium Excess  

Science Journals Connector (OSTI)

Manganese spinel LiMn2O4 may replace the commercial cathode material, LiCoO2, which is more expensive and toxic. Stoichiometric LiMn2O4 shows a phase transition from cubic (Fd3m) to orthorhombic (Fddd) structure ...

M. Molenda; R. Dziembaj

2002-01-01T23:59:59.000Z

423

Identification of Mn(II)-Oxidizing Bacteria from a Low-pH Contaminated Former Uranium Mine  

Science Journals Connector (OSTI)

...decrease in aqueous metal load. The biogenic minerals produced by our isolates at pH 5.5...determination of pH-value of the soil and lime requirement. Handbuch der Bodenuntersuchung...1994. Manganese(II) oxidation at mineral surfaces: a microscopic and spectroscopic...

Denise M. Akob; Tsing Bohu; Andrea Beyer; Franziska Schäffner; Matthias Händel; Carol A. Johnson; Dirk Merten; Georg Büchel; Kai Uwe Totsche; Kirsten Küsel

2014-06-13T23:59:59.000Z

424

Aluminum battery alloys  

DOE Patents [OSTI]

Aluminum alloys suitable for use as anode structures in electrochemical cells are disclosed. These alloys include iron levels higher than previously felt possible, due to the presence of controlled amounts of manganese, with possible additions of magnesium and controlled amounts of gallium.

Thompson, D.S.; Scott, D.H.

1984-09-28T23:59:59.000Z

425

EVALUATION OF THE METALLIC CONTAMINATION IMPACT ON 'MYTILUS EDULIS' MUSSEL AT THE LEVEL OF THE MOUTH OF  

E-Print Network [OSTI]

for manganese, chromium and cadmium. Seven trace metals (Mn, Cu, Cr, Pb, Co, Fe and Cd) were detected selective way. Keywords: Mytilus edulis; Trace metals; Bioaccumulation; Bioindicator. 1. INTRODUCTION Oued slopes of the Rif range and from the north western slopes of the middle Atlas. It lies between the 33rd

Paris-Sud XI, Université de

426

Modelling Al and Mn in the open ocean  

E-Print Network [OSTI]

Modelling Al and Mn in the open ocean Marco van Hulten*, Alessandro Tagliabue, Jean-Claude Dutay van Hulten: Modelling Al and Mn in the open ocean 1 #12;Outline Introduction Model of aluminium Constraining dust flux Model of manganese Conclusions Marco van Hulten: Modelling Al and Mn in the open ocean 2

Haak, Hein

427

Ductile Binder Phase For Use With Almgb14 And Other Hard Ceramic Materials  

DOE Patents [OSTI]

This invention relates to a ductile binder phase for use with AlMgB14 and other hard materials. The ductile binder phase, a cobalt-manganese alloy, is used in appropriate quantities to tailor good hardness and reasonable fracture toughness for hard materials so they can be used suitably in industrial machining and grinding applications.

Cook, Bruce A. (Ankeny, IA); Russell, Alan (Ames, IA); Harringa, Joel (Ames, IA)

2005-07-26T23:59:59.000Z

428

BERKELEY CATALYSIS CENTER Friday November 18, 2005  

E-Print Network [OSTI]

. The catalyst employed was silica-supported manganese oxide (MnO2/SiO2) because of the well-known activity it is a common industrial solvent, and the health risks associated with acetone are similar to those of many other VOCs. In order to obtain molecular level information about the various steps in the catalytic

Iglesia, Enrique

429

Aluminum battery alloys  

DOE Patents [OSTI]

Aluminum alloys suitable for use as anode structures in electrochemical cs are disclosed. These alloys include iron levels higher than previously felt possible, due to the presence of controlled amounts of manganese, with possible additions of magnesium and controlled amounts of gallium.

Thompson, David S. (Richmond, VA); Scott, Darwin H. (Mechanicsville, VA)

1985-01-01T23:59:59.000Z

430

792 Organometallics 1991, 10, 792-799 High-Valent Organomanganese Chemistry. 1. Synthesis and  

E-Print Network [OSTI]

with the lithium atoms capping opposite faces in an asymmetric fashion: Mn-C = 2.12 (1) A, Li-C = 2.20 (l),2.35 (2 of man- ganese(II1) and manganese(1V) are often potent oxidants; for example, manganic acetate, "Mn

Girolami, Gregory S.

431

Dawei Liu, Yanyi Liu, Anqiang Pan, Betzaida Batalla Garcia, Qifeng Zhang and Guozhong Cao Department of Materials Science and Engineering, University of Washington, Seattle 98195  

E-Print Network [OSTI]

to fabricate nanostructure with large surface area, reduced lithium ion diffusion path and enhanced by the repeated conversion between chemical energy and electrical energy. Schematic of lithium ion battery cell deposition with cathodic voltage -1.8 V, Manganese acetate electrolyte, Pt coated Si substrate Local p

Cao, Guozhong

432

Understanding structural defects in lithium-rich layered oxide cathodes Karalee A. Jarvis,a  

E-Print Network [OSTI]

the required amounts of lithium, manganese, and nickel acetates were added to this solution. The molar ratioUnderstanding structural defects in lithium-rich layered oxide cathodes Karalee A. Jarvis, Accepted 31st March 2012 DOI: 10.1039/c2jm30575e Planar defects in lithium-rich layered oxides were

Ferreira, Paulo J.

433

Journal of Power Sources 132 (2004) 256260 Short communication  

E-Print Network [OSTI]

glycol, allyl bromide, lithium tri- fluorosulfonamide and acetic acid were purchased from Aldrich. endo of lithium manganese oxide nanoparticles. The block copolymer functions as a polyelectrolyte and as a composite anode in a lithium battery system. Impedance spectroscopy and galvanostatic testing, X

Rubloff, Gary W.

434

Influence of solvents on the synthesis and electrochemical properties of Li[Li1/5Ni1/10Co1/5Mn1/2]O2 for the applications in lithium-ion batteries  

Science Journals Connector (OSTI)

The Li[Li1/5Ni1/10Co1/5Mn1/2]O2 was prepared with starting materials having acetate functional group, lithium acetate (CH3COOLi · 2H2O), nickel acetate ((CH3COO)2Ni · 4H2O), manganese acetate ((CH3COO)2Mn · 4H2O)...

K. S. Park; C. H. Song; A. Manuel Stephan; S. K. Jeong…

2006-11-01T23:59:59.000Z

435

Synthesis and characterization of pristine Li2MnSiO4 and Li2MnSiO4/C cathode materials for lithium ion batteries  

Science Journals Connector (OSTI)

Pristine Li2MnSiO4 and Li2MnSiO4.../C were both prepared by the sol–gel method. Citric acid was used as the carbon source. Lithium acetate dihydrate, manganese acetate tetrahydrate, and citric acid were first dis...

Qianqian Zhang; Quanchao Zhuang; Shoudong Xu; Xiangyun Qiu; Yongli Cui; Yueli Shi…

2012-05-01T23:59:59.000Z

436

Gas Chromatographic Determination Of Chromium in Serum  

Science Journals Connector (OSTI)

......showed that cholesterol and fatty acid synthesis by rat liver was enhanced by the presence...reagent is pre- pared fresh each day. Acetate buff er, 1.0 M., pH 6.0. Exactly...tions: arsenic, lead, mercury, lithium, manganese, and strontium-50 pg per......

John Savory; Paul Mushak; F. William Sunderman; Jr.

1969-11-01T23:59:59.000Z

437

CX-100010: Categorical Exclusion Determination  

Office of Energy Efficiency and Renewable Energy (EERE)

Geothermal Thermoelectric Generation (G-TEG) with integrated Temperature Driven Membrane Distillation and Novel Manganese Oxide for Lithium Extraction CX(s) Applied: A9, B3.6 Date: 08/27/2014 Location(s): Georgia Offices(s): Golden Field Office Technology Office: Geothermal Technologies Award Number: DE-EE0006746

438

Hydrological SciencesJournaldes Sciences Hydrologiques, 47(5) October 2002 Open for discussion until 1 April 2003  

E-Print Network [OSTI]

manganese (Mn) in upland catchments is required for water quality management. Stream water Mn and other concentrations in stream water. This approach was more successful for HS4 than HS7, probably because of different. Factor analysis of the stream water chemistry data set for each catchment was more useful in identifying

Heal, Kate

439

Crystal structure of LaMnO[sub 3+[delta  

SciTech Connect (OSTI)

Poly(acrylic acid) (PAA) was used to make a gel from an aqueous solution of lanthanum and manganese nitrates. In the concentration range 3 [times] 10[sup [minus]2] to 5 [times] 10[sup [minus]2] M of PAA, the single phase of perovskite-type LaMnO[sub 3+[delta

Taguchi, Hideki; Yoshioka, Hideaki; Matsuda, Daisuke; Nagao, Mahiko (Okayama Univ. (Japan))

1993-06-01T23:59:59.000Z

440

THE TOPOLOGY OF HYDROGEN BONDING IN BRANDTITE, COLLINSITE AND FAIRFIELDITE  

Science Journals Connector (OSTI)

...and the structure of the isostructural talmessite was refined by Catti et al.(1977...AsO4)2(H2O)2 (wendwilsonite and talmessite), Ca2Co(AsO4)2(H2O)2 (roselite...Parabrandtite, the manganese analogue of talmessite, from Sterling Hill, Ogdensburg...

Sasha Herwig; Frank C. Hawthorne

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Catalytic Properties of MnO, Fe2O3, and MnFe2O4 in the Steam Reforming of Ethanol  

Science Journals Connector (OSTI)

The catalytic activity of manganese ferrite MnFe2O4 and the oxides MnO and Fe2O3 in the steam reforming of ethanol (SRE) has been studied. The similarity...2O3 and MnFe2O4 has been established which may indicate ...

L. Yu. Dolgykh; I. L. Stolyarchuk; L. A. Staraya…

2014-09-01T23:59:59.000Z

442

Determination of Mn valence states in mixed-valent manganates by XANES spectroscopy  

Science Journals Connector (OSTI)

...overabsorption, many of the references were run in total electron yield mode. For others...the slope of the valence = f (energy) straight line. Therefore, the only way to improve...methylcyclopentadienyl) manganese tricarbonyl-added gasolines using XANES spectroscopy. Environmental...

Alain Manceau; Matthew A. Marcus; Sylvain Grangeon

443

Nitrated metalloporphyrins as catalysts for alkane oxidation  

DOE Patents [OSTI]

Compositions of matter comprising nitro-substituted metal complexes of porphyrins are catalysts for the oxidation of alkanes. The metal is iron, chromium, manganese, ruthenium, copper or cobalt. The porphyrin ring has nitro groups attached thereto in meso and/or .beta.-pyrrolic positions.

Ellis, Jr., Paul E. (Downingtown, PA); Lyons, James E. (Wallingford, PA)

1994-01-01T23:59:59.000Z

444

Cyano- and polycyanometallo-porphyrins as catalysts for alkane oxidation  

DOE Patents [OSTI]

New compositions of matter comprising cyano-substituted metal complexes of porphyrins are catalysts for the oxidation of alkanes. The metal is iron, chromium, manganese, ruthenium, copper or cobalt. The porphyrin ring has cyano groups attached thereto in meso and/or .beta.-pyrrolic positions.

Ellis, Jr., Paul E. (Downingtown, PA); Lyons, James E. (Wallingford, PA)

1993-01-01T23:59:59.000Z

445

Cyano- and polycyanometallo-porphyrins as catalysts for alkane oxidation  

DOE Patents [OSTI]

New compositions of matter comprising cyano-substituted metal complexes of porphyrins are catalysts for the oxidation of alkanes. The metal is iron, chromium, manganese, ruthenium, copper or cobalt. The porphyrin ring has cyano groups attached thereto in meso and/or .beta.-pyrrolic positions.

Ellis, Jr., Paul E. (Downingtown, PA); Lyons, James E. (Wallingford, PA)

1995-01-01T23:59:59.000Z

446

Arkansas Water Resources Center  

E-Print Network [OSTI]

MOUNTAINS PREPARED BY: Kenneth F. Steele Department of Geology University of Arkansas Fayetteville, Arkansas Kenneth F. Steele Department of Geology University of Arkansas Fayetteville, AR 72701 Research Project Arkan- sas in order to determine the effect of local manganese, phosphate, pyrite, lead-zinc and uranium

Soerens, Thomas

447

Conversion of CH4 into H2 at 300 C using Pd/MnO2 catalyst made with an effect of water oxidation  

SciTech Connect (OSTI)

A novel electricity-free deposition of palladium on the surface of manganese dioxide, which has a crystal structure of ramsdellite, was studied. Using the Pd deposition, a nano-particle of Pd/MnO2 was prepared, and it was used for a catalytic performance for reforming methane into hydrogen at 300 C.

Koyanaka, Hideki [Forward Science Laboratory Ltd, Oita, Japan] [Forward Science Laboratory Ltd, Oita, Japan; Takeuchi, K [Tokyo University of Science, Oshamanbe Hokkaido, Japan] [Tokyo University of Science, Oshamanbe Hokkaido, Japan; Kolesnikov, Alexander I [ORNL] [ORNL

2014-01-01T23:59:59.000Z

448

Isolation and characterization of methyl viologen-sensitive mutants of Escherichia coli K-12.  

Science Journals Connector (OSTI)

...MV), or paraquat, is a powerful superoxide radical propa- gator (12, 17, 18). MV is readily reduced by a single electron...only to MV and are resistant to other active oxygen propa- gator reagents (19) such as hydrogen peroxide and ionizing radiation...

M Morimyo

1988-05-01T23:59:59.000Z

449

Isolation and effects of citrus limonoids on cytochrome p450 inhibition, apoptotic induction and cytotoxicity on human cancer cells.  

E-Print Network [OSTI]

(deacetylnomilinic acid 17beta-D glucopyranoside), have shown superoxide scavenging at millimolar levels. Micromolar amounts of LG and OG induced rapid necrosis of SH-SY5Y cells. Cytotoxicity was correlated (P = 0.046) to a concentration and timedependent increase...

Poulose, Shibu M.

2007-04-25T23:59:59.000Z

450

Cell Biology of Plant and Fungal Tip Growthâ??Getting to the Point  

Science Journals Connector (OSTI)

...Universita di Siena sponsored a NATO Advanced Research Workshop which brought together 75 of...appear in a dedicated volume (), and abstracts of the presentations can be viewed at...apparently not as a supplier of metabolic energy. He suggested that apical superoxide...

I. Brent Heath; Anja Geitmann

451

hTERT Overexpression Alleviates Intracellular ROS Production, Improves Mitochondrial Function, and Inhibits ROS-Mediated Apoptosis in Cancer Cells  

Science Journals Connector (OSTI)

...inhibits endogenous ROS production in response to stimuli...superoxide (O2 ) and hydrogen peroxide (H2O2...and reducing O2 production (16). More recently...Materials and Methods Cell lines, culture...Pervaiz S Clement MV. Hydrogen peroxide-induced...reductive stress?Methods Enzymol 2002;352...

Inthrani R. Indran; Manoor P. Hande; and Shazib Pervaiz

2011-01-01T23:59:59.000Z

452

ANTIOXIDANTS & REDOX SIGNALING Volume 5, Number 1, 2003  

E-Print Network [OSTI]

natural mediator, or oxygen-reducing factor, that allows oxygen reduction to participate in energy- port can be measured as light-dependent oxygen uptake. Oxygen uptake in the Mehler reaction has- or four -electron reduction of oxyge n, or by mea ns of simu ltane- ous consumption of superoxide so

Allen, John F.

453

Generation of DNA-Damaging Reactive Oxygen Species via the Autoxidation of Hydrogen Sulfide under Physiologically Relevant  

E-Print Network [OSTI]

Generation of DNA-Damaging Reactive Oxygen Species via the Autoxidation of Hydrogen Sulfide under found that micromolar concentrations of H2S generated single-strand DNA cleavage. Mechanistic studies indicate that this process involved autoxidation of H2S to generate superoxide, hydrogen peroxide, and

Gates, Kent. S.

454

Building a Better Battery | Advanced Photon Source  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

A New Method for Measuring X-ray Optics Aberrations A New Method for Measuring X-ray Optics Aberrations New Clues for Asthma Treatment Extending Resonant Diffraction to Very High Energies for Structural Studies of Complex Materials Tuning the Collective Properties of Artificial Nanoparticle Supercrystals The Workings of a Key Staph Enzyme and How to Block It Science Highlights Archives: 2013 | 2012 | 2011 | 2010 2009 | 2008 | 2007 | 2006 2005 | 2004 | 2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed Building a Better Battery APRIL 23, 2011 Bookmark and Share (Top panel) Schematic arrangement of lithium (yellow), cobalt (blue), and manganese (magenta) atoms in the transition metal plane of the layered Li1.2Co0.4Mn0.4O2 structure. Well connected areas with LiCoO2, where only cobalt is present, and Li2MnO3, where manganese atoms surround lithium

455

Microsoft PowerPoint - Bender - 11th Annual SECA Conference  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Functional Interconnect Functional Interconnect System for Solid Oxide Fuel Cells Program #DE-FC26-05NT42513 Matthew Bender July 28, 2010 2 © ATI 2010. All Rights Reserved. Presentation Overview * Overview of ATI and ATI Allegheny Ludlum * Alloy Design - Third-Generation Alloy Development - ASR Testing - Oxidation Testing * Post-Processing Surface Modification - Sample Preparation - ASR Testing * Additional SECA Activities - Processing of Material for Low-Chromium Alloy Research 3 © ATI 2010. All Rights Reserved. Conclusions 1 * A cerium-modified manganese cobaltite spinel coating continues to be effective in reducing the rate of ASR increase for nearly all of the potential interconnect alloys tested * The rate of increase in ASR of ATI 441HP(tm) alloy coated with PNNL's cerium-modified manganese cobaltite spinel

456

It's Elemental - The Element Chromium  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Vanadium Vanadium Previous Element (Vanadium) The Periodic Table of Elements Next Element (Manganese) Manganese The Element Chromium [Click for Isotope Data] 24 Cr Chromium 51.9961 Atomic Number: 24 Atomic Weight: 51.9961 Melting Point: 2180 K (1907°C or 3465°F) Boiling Point: 2944 K (2671°C or 4840°F) Density: 7.15 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 4 Group Number: 6 Group Name: none What's in a name? From the Greek word for color, chroma. Say what? Chromium is pronounced as KROH-mee-em. History and Uses: Chromium was discovered by Louis-Nicholas Vauquelin while experimenting with a material known as Siberian red lead, also known as the mineral crocoite (PbCrO4), in 1797. He produced chromium oxide (CrO3) by mixing

457

Stanford Synchrotron Radiation Lightsource  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Using X-rays to Find an Evolutionary Step in the Origin of Oxygenic Using X-rays to Find an Evolutionary Step in the Origin of Oxygenic Photosynthesis July 2013 SSRL Science Summary by Manuel Gnida, SLAC Office of Communications Figure The evolution of oxygenic photosynthesis approximately 2.3 to 2.4 billion years ago revolutionized life on Earth. For most modern-day terrestrial life, oxygen has become indispensable. At the heart of oxygenic photosynthesis is the production of oxygen from water - a process mediated by the water-splitting manganese cluster of Photosystem II. Little is known about how oxygenic photosynthesis originally evolved, although some have hypothesized a manganese-oxidizing photosystem as a precursor step. Researchers from the California Institute of Technology, SSRL, and the Massachusetts Institute of Technology have now found geological

458

The Risk Assessment Information System  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Formal Toxicity Summary for MANGANESE Formal Toxicity Summary for MANGANESE NOTE: Although the toxicity values presented in these toxicity profiles were correct at the time they were produced, these values are subject to change. Users should always refer to the Toxicity Value Database for the current toxicity values. EXECUTIVE SUMMARY 1. INTRODUCTION 2. METABOLISM AND DISTRIBUTION 2.1 ABSORPTION 2.2 DISTRIBUTION 2.3 METABOLISM 2.4 EXCRETION 3. NONCARCINOGENIC HEALTH EFFECTS 3.1 ORAL EXPOSURES 3.2 INHALATION EXPOSURES 3.3 OTHER ROUTES OF EXPOSURE 3.4 TARGET ORGANS/CRITICAL EFFECTS 4. CARCINOGENICITY 4.1 ORAL EXPOSURES 4.2 INHALATION EXPOSURES 4.3 OTHER ROUTES OF EXPOSURE 4.4 EPA WEIGHT-OF-EVIDENCE 4.5 CARCINOGENICITY SLOPE FACTORS 5. REFERENCES July 1995 Prepared by A. A. Francis and C. Forsyth, Chemical Hazard Evaluation Group,

459

FY 2012 Annual Progress Report for Energy Storage R&D  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

FY 2012 Annual Progress Report ix Energy Storage R&D FY 2012 Annual Progress Report ix Energy Storage R&D $1.5 Billion for Advanced Battery Manufacturing for Electric Drive Vehicles "Commercial Ready Technologies" Material Supply Cell Components Cell Fabrication Pack Assembly Recycling Lithium Supply Cathode Prod. Iron Phosphate Iron Phosphate Lithium Ion 1 award 3 awards 1 award 1 award 1 award Anode Prod. Nickel Cobalt Metal Nickel Cobalt Metal 2 awards 3 awards 3 awards Electrolyte Prod. Manganese Spinel Manganese Spinel 2 awards 2 awards 2 awards Advanced Lead Separator Prod. Acid Batteries 2 awards 2 awards Other Component 1 award $28.43 M $259 M $735 M $462 M $9.55 M II. American Recovery & Reinvestment Act (ARRA) of 2009

460

Characterization of Al-Mn particles in AZ91D investment castings  

SciTech Connect (OSTI)

Manganese is currently added to Mg-Al alloys in order to improve the corrosion behavior of cast components. A part of this manganese is dissolved in the magnesium matrix and the balance is found as fine Al(Mn,Fe) particles dispersed within castings. For AZ91D specimens prepared using the plaster mould investment casting process, these particles were observed in very large quantity at the surface of castings. These particles were characterized by scanning electron microscopy and electron probe microanalysis. It was found that they consist of Al{sub 8}Mn{sub 5} phase and that their morphology and size depend on local solidification conditions. Their presence at the surface of the castings is related to low solidification rates and reduced thermal gradients at the mould/metal interface.

Lun Sin, S. [Department of Mining, Metallurgical and Materials Engineering, Laval University, Quebec, Quebec, G1K 7P4 (Canada); Dube, D. [Department of Mining, Metallurgical and Materials Engineering, Laval University, Quebec, Quebec, G1K 7P4 (Canada)], E-mail: dominique.dube@gmn.ulaval.ca; Tremblay, R. [Department of Mining, Metallurgical and Materials Engineering, Laval University, Quebec, Quebec, G1K 7P4 (Canada)

2007-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Mn-Fe base and Mn-Cr-Fe base austenitic alloys  

DOE Patents [OSTI]

Manganese-iron base and manganese-chromium-iron base austenitic alloys designed to have resistance to neutron irradiation induced swelling and low activation have the following compositions (in weight percent): 20 to 40 Mn; up to about 15 Cr; about 0.4 to about 3.0 Si; an austenite stabilizing element selected from C and N, alone or in combination with each other, and in an amount effective to substantially stabilize the austenite phase, but less than about 0.7 C, and less than about 0.3 N; up to about 2.5 V; up to about 0.1 P; up to about 0.01 B; up to about 3.0 Al; up to about 0.5 Ni; up to about 2.0 W; up to about 1.0 Ti; up to about 1.0 Ta; and with the remainder of the alloy being essentially iron.

Brager, Howard R. (Richland, WA); Garner, Francis A. (Richland, WA)

1987-01-01T23:59:59.000Z

462

Rare-Earth-Free Nanostructure Magnets: Rare-Earth-Free Permanent Magnets for Electric Vehicle Motors and Wind Turbine Generators: Hexagonal Symmetry Based Materials Systems Mn-Bi and M-type Hexaferrite  

SciTech Connect (OSTI)

REACT Project: The University of Alabama is developing new iron- and manganese-based composite materials for use in the electric motors of EVs and renewable power generators that will demonstrate magnetic properties superior to today’s best rare-earth-based magnets. Rare earths are difficult and expensive to refine. EVs and renewable power generators typically use rare earths to make their electric motors smaller and more powerful. The University of Alabama has the potential to improve upon the performance of current state-of-the-art rare-earth-based magnets using low-cost and more abundant materials such as manganese and iron. The ultimate goal of this project is to demonstrate improved performance in a full-size prototype magnet at reduced cost.

None

2012-01-01T23:59:59.000Z

463

Metal Carbonyl-Hydrosilane Reactions and Hydrosilation Catalysis  

SciTech Connect (OSTI)

Manganese carbonyl complexes serve as hydrosilation precatalysts for selectively transforming a carbonyl group into a siloxy methylene or a fully reduced methylene group. Substrates of interest include (1) aldehydes, ketones, carboxylic acids, silyl esters, and esters, and (2) their organometallic acyl counterparts. Three relevant catalytic reactions are shown. Two types of manganese precatalysts have been reported: (a) alkyl and acyl complexes (L)(C0){sub 4}MnR [L = CO, PPh{sub 3}; R = COCH{sub 3}, COPh, CH{sub 3}] and (b) halides (CO){sub 5}MnX and [(CO){sub 4}MnX]{sub 2} (X = Br, I). The former promote hydrosilation and deoxygenation catalysis; the latter promote dehydrogenative silation of alcohols and carboxylic acids as well as hydrosilation and deoxygenation of some metallocarboxylic acid derivatives. In every case studied, these Mn precatalysts are far more reactive or selective than traditional Rh(I) precatalysts.

Cutler, A. R.

2001-04-14T23:59:59.000Z

464

Catalyst for steam reforming of hydrocarbons and process of preparing the catalyst  

SciTech Connect (OSTI)

A catalyst is provided for the steam reforming of normally liquid hydrocarbons to produce carbon monoxide and hydrogen, which does not promote the deposition of carbonaceous materials upon the catalytic surfaces. The catalyst consists of nickel promoted with the oxides of iron and manganese within a specific manganese to iron ratio, said metal and metal oxides being supported upon a refractory support. The support is preferably aluminum oxide in its alpha phase having a surface area of less than 15 m2/gm. The metallic constituents are impregnated onto said refractory low surface area support as salts and are calcined at sufficiently high temperature to convert the salts to the oxide but at a sufficiently low temperature that they do not chemically react with the support.

Broughton, D.R.; Russ, K.J.

1980-06-10T23:59:59.000Z

465

Process for steam reforming of hydrocarbons  

SciTech Connect (OSTI)

A process is provided for the steam reforming of normally liquid hydrocarbons to produce carbon monoxide and hydrogen, which does not promote the deposition of carbonacious materials upon catalytic surfaces. The catalyst consists of nickel promoted with the oxides of iron and manganese within a specific manganese to iron ratio, said metal and metal oxides being supported upon a refractory support. The support is preferably aluminum oxide in its alpha phase having a surface area of more than 0.5 m2/gm but no more than 10 m2/gm. The metallic constituents are impregnated onto said refractory low surface area support as salts and are calcined at sufficiently high temperature to convert the salts to the oxide but at a sufficiently low temperature that they do not chemically react with the support.

Broughton, D.R.; Russ, K.J.

1980-11-11T23:59:59.000Z

466

Photo-induced electron transfer method  

DOE Patents [OSTI]

The efficiency of photo-induced electron transfer reactions is increased and the back transfer of electrons in such reactions is greatly reduced when a photo-sensitizer zinc porphyrin-surfactant and an electron donor manganese porphyrin-surfactant are admixed into phospholipid membranes. The phospholipids comprising said membranes are selected from phospholipids whose head portions are negatively charged. Said membranes are contacted with an aqueous medium in which an essentially neutral viologen electron acceptor is admixed. Catalysts capable of transferring electrons from reduced viologen electron acceptor to hydrogen to produce elemental hydrogen are also included in the aqueous medium. An oxidizable olefin is also admixed in the phospholipid for the purpose of combining with oxygen that coordinates with oxidized electron donor manganese porphyrin-surfactant.

Wohlgemuth, R.; Calvin, M.

1984-01-24T23:59:59.000Z

467

Photo-induced electron transfer method  

DOE Patents [OSTI]

The efficiency of photo-induced electron transfer reactions is increased and the back transfer of electrons in such reactions is greatly reduced when a photo-sensitizer zinc porphyrin-surfactant and an electron donor manganese porphyrin-surfactant are admixed into phospho-lipid membranes. The phospholipids comprising said membranes are selected from phospholipids whose head portions are negatively charged. Said membranes are contacted with an aqueous medium in which an essentially neutral viologen electron acceptor is admixed. Catalysts capable of transfering electrons from reduced viologen electron acceptor to hydrogen to produce elemental hydrogen are also included in the aqueous medium. An oxidizable olefin is also admixed in the phospholipid for the purpose of combining with oxygen that coordinates with oxidized electron donor manganese porphyrin-surfactant.

Wohlgemuth, Roland (2823 Hillegass Ave., Berkeley, CA 94705); Calvin, Melvin (2683 Buena Vista Way, Berkeley, CA 94708)

1984-01-01T23:59:59.000Z

468

Structural analysis of lithium-excess lithium manganate cathode materials by 7Li magic-angle spinning nuclear magnetic resonance spectroscopy  

Science Journals Connector (OSTI)

The local structures of lithium-excess lithium manganese spinel oxides were studied by high-resolution solid-state 7Li magic-angle spinning (MAS) NMR spectroscopy. Two resonance lines at ?500 and ?555 ppm were observed for the spinels in 7Li MAS NMR spectra. Spinel stability tests in which spinel powder was stored in electrolyte solution were performed to analyze the changes in the lithium local structure after manganese dissolution. After the spinel stability test, the intensity of the resonance at ?500 ppm decreased, whereas new resonance line at 0 ppm was observed. The lithium content of the 0 ppm peak increases with the storage time in electrolyte. SEM and chemical analysis suggested a surface coating of non-spinel lithium compounds, the presence of defects on particles surface and fluorine incorporation into the aged spinel. In addition, about 60–70% of lithium remains in the spinel framework after the storage.

Hideyuki Oka; Senshi Kasahara; Tadashi Okada; Eiichi Iwata; Masaki Okada; Takayuki Shoji; Hiroshi Ohki; Tsutomu Okuda

2001-01-01T23:59:59.000Z

469

Supporting Information for Oxidative Transformation of Triclosan and Chlorophene  

E-Print Network [OSTI]

Supporting Information for Oxidative Transformation of Triclosan and Chlorophene by Manganese-894-8266; e-mail: ching-hua.huang@ce.gatech.edu. Figure S1. Oxidation of triclosan by MnO2: the reaction order with respect to triclosan. Reaction contained 0.01 M pH 5 acetate buffer and 0.01 M NaCl and 22 °C. Figure S2

Huang, Ching-Hua

470

Fertilizers for Rice in Texas.  

E-Print Network [OSTI]

in the rice-growing area, however, dif- ferent soils responded differently to fertilizers applied to rice. In the experiments on Lake Charles clay soil near Devers, in Liberty County, and on the light-colored soils in Orange County, applications of super... ........................................ Tests in Liberty County 14 ........................................ Tests in Orange County 15 ................ Work with Manganese, Copper. Zinc. Iron. and Boron 16 Acknowledgments .......................................... 16 Summary...

Wyche, R. H. (Robert Henry)

1941-01-01T23:59:59.000Z

471

Influence of certain additives and combinations of them on the structure and properties of clinker  

SciTech Connect (OSTI)

The results of investigations of the influence of BaO, Mn/sub 2/O/sub 3/, and the BaO + Mn/sub 2/O/sub 3/ combination on the phase composition of clinker, the contents of different forms of alite, and the burning temperature are reported. A specific feature of the clinkers taken for the investigation is that they contain over 4% MgO. The additives used in the investigation were barium-containing wastes from lithopone production and ''tailings'' from concentration of manganese ores. The barium-containing wastes contained from 30 to 40% BaO, and the Mn/sub 2/O/sub 3/ content in tailings from manganese ores reached 15-16%; moreover, they contained up to 60% SiO/sub 2/, which is important for raising the silica ratio. At the same time, the use of manganese wastes in the cement raw mix makes the use of cinders unnecessary. The amounts of wastes introduced into the raw mix were calculated to give BaO contents in the clinkers from 0.3 to 0.9% and Mn/sub 2/O/sub 3/ contents from 0.7 to 1.4%. Introduction of alloying and modifying additives containing Ba and Mn into cement raw mixes intensifies the burning process, lowering the temperature by 100/sup 0/C. The change of the burning temperature in presence of additives is accompanied by changes of the modification composition of the principal silicate phase, alite. Lowering of the sintering temperature reveals a high degree of imperfection of the structure of cement minerals arising as the result of introduction of BaO and Mn/sub 2/O/sub 3/. Cements containing alloying and modifying additions of barium and manganese and obtained at lower temperatures have higher activity than cements without additives.

Minkina, V.N.; Sychev, M.M.; Tandilova, K.B.; Papuashvili, S.N.

1983-04-20T23:59:59.000Z

472

Role of stress-assisted martensite in the design of strong ultrafine-grained duplex steels  

E-Print Network [OSTI]

stress- assisted process that enhances transformation-induced plasticity in ultrafine-grained austenite. This metallurgical principle was validated experimentally by using a combination of transmission Kikuchi diffraction mapping, transmission electron... intrusion applications or hole-expanded components in the automotive industry [1]. Moreover, some of the medium manganese steels require prolonged heat treatments so as to ensure solute partitioning in order to stabilise the austenite [16, 17], making...

Yen, Hung-Wei; Ooi, Steve Woei; Eizadjou, Mehdi; Breen, Andrew; Huang, Ching-Yuan; Bhadeshia, H. K. D. H.; Ringer, Simon P.

2014-10-03T23:59:59.000Z

473

Annual Report of the Feed Control Service, 1950-51 : September 1, 1950, to August 31, 1951.  

E-Print Network [OSTI]

under which chick and turkeys are often kept. USDA Circular 788 entitled "Nutritive Requirements and F Formulas for Chickens," contains the following statement: UUL, at- :ens 'eed Disease and Mortality Ascribed to Diet When disease of unknown... ingredient. As stated previousl,, practical diets for chickens sometimes are deficient in vitamin A or D, or riboflavin or manganese. Each of these deficiencies is much more easily detected by examining the chickens than by examining the feed. Deficiency...

Holleman, M. P.; Brock, F. D.

1951-01-01T23:59:59.000Z

474

Doubly Doped Nanocrystals DOI: 10.1002/ange.201100464  

E-Print Network [OSTI]

, Mn2+ -doped CdS[17] and ZnS[18,19] NCs with white-light emission have been successfully prepared of semiconductor NCs with white-light emission such as "magic-sized" CdSe NCs,[1] trap-rich CdS-QDs and onionDoubly Doped Nanocrystals DOI: 10.1002/ange.201100464 Bright White-Light Emitting Manganese

Demir, Hilmi Volkan

475

Ozone treatment in a closed culture system for Macrobrachium rosenbergii  

E-Print Network [OSTI]

constant flow of air. The Orthotoridine-Manganese Method (OTM) wss employed to measure ozone in solution (APHA, 1976) . Because of the rapid rate of decomposition of ozone in water, it was determined that the production of ozone could not be measured... by introducing into water and then sampling that water for analysis with OTM. Therefore, ozone was introduced directly into a solution of OTM reagent with subsequent changes in color of the reagent, measured on a "B & L Spectronic 70" spectrophotometer, being...

Yamaguchi, Ryoji

1978-01-01T23:59:59.000Z

476

Total Syntheses of Linear Poly-Thiazole/Oxazole Plantazolicin A and its biosynthetic precursor Plantazolicin B  

E-Print Network [OSTI]

condensed with cysteine ethyl ester hydrochloride salt 15, before oxidation of thiazolidine 25 using manganese dioxide to give thiazole 8 in and overall yield of 42%. This yield was comparable to those obtained previously for 8, but avoided the use... , condensation with cysteine methyl ester hydrochloride 13 and MnO2 mediated oxidation to afford thiazole 4b in an acceptable 41% overall yield. This is a marked improvement on the previous synthesis for related fragments. Removal of all nitrogen protection...

Wilson, Zoe E.; Fenner, Sabine; Ley, Steven V.

2014-11-25T23:59:59.000Z

477

Stabilization of solar films against hi temperature deactivation  

DOE Patents [OSTI]

A multi-layer solar energy collector of improved stability comprising: (1) a solar absorptive film consisting essentially of copper oxide, cobalt oxide and manganese oxide; (2) a substrate of quartz, silicate glass or a stainless steel; and (3) an interlayer of platinum, plus a method for preparing a thermally stable multi-layered solar collector, in which the absorptive layer is undercoated with a thin film of platinum to obtain a stable conductor-dielectric tandem.

Jefferson, Clinton F. (Millburn, NJ)

1984-03-20T23:59:59.000Z

478

JOURNAL DE PHYSIQUE Colloque C I, supplPment au no 2-3, Tome 32, FPvrier-Mars 1971,page C 1 -70 NEUTRON DIFFRACTION STUDY OF SHORT RANGE ORDER  

E-Print Network [OSTI]

cross-section for neutron scattering is do -dQ = m~ m~(b, - bd2 i=o ai exp i(K.Ri) (I) where ai = 1 - Pi NEUTRON DIFFRACTION STUDY OF SHORT RANGE ORDER IN r-iMnNi P. WELLS and J. H. SMITH Physics Department un moment magnetique par atome de manganese de 1,5 +. 0,l WB. Une etude par diffraction de neutrons r

Boyer, Edmond

479

Distribution of hazardous air pollutant trace elements, total sulfur, and ash in coals from five Tertiary basins in the Rocky Mountain Region  

SciTech Connect (OSTI)

Arithmetic mean values of the contents of hazardous air pollutant (HAP) trace elements named in the 1990 Clean Air Act Amendments (antimony, arsenic, beryllium, cadmium, chromium, cobalt, lead, manganese, mercury, nickel, selenium, and uranium), ash, and total sulfur were statistically compared on a whole-coal basis for Paleocene coals from five Tertiary basins in the Rocky Mountain Region. The study of proximate and elemental analyses indicate a relationship between trace element contents and paleogeography.

Ellis, M.S.; Stricker, G.D.; Flores, R.M. [Geological Survey, Denver, CO (United States)

1994-12-31T23:59:59.000Z

480

Surface monolayers of well-defined amphiphilic block copolymer composed of poly(acrylic acid) or poly(oxyethylene) and poly(styrene). Interpolymer complexation at the air-water interface  

SciTech Connect (OSTI)

Amphiphilic block polymers (2,3) composed of poly(acrylic acid) (PAA) or poly(oxyethylene) (POE) and chain length controlled poly(styrene) (PSt) have been prepared by using a catalytic system of tribromomethyl-terminated oligomer and manganese carbonyl. All the amphiphilic materials formed well-behaved surface monolayers, and the II-A curves for them expanded systematically with an increase of the PSt chain length.

Niwa, Masazo; Hayashi, Takehiro; Higashi, Nobuyuki (Doshisha Univ., Kyoto (Japan))

1990-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "manganese superoxide dismutase" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Heat and corrosion resistant cast CN-12 type stainless steel with improved high temperature strength and ductility  

DOE Patents [OSTI]

A cast stainless steel alloy and articles formed therefrom containing about 0.5 wt. % to about 10 wt. % manganese, 0.02 wt. % to 0.50 wt. % N, and less than 0.15 wt. % sulfur provides high temperature strength both in the matrix and at the grain boundaries without reducing ductility due to cracking along boundaries with continuous or nearly-continuous carbides. Alloys of the present invention also have increased nitrogen solubility thereby enhancing strength at all temperatures because nitride precipitates or nitrogen porosity during casting are not observed. The solubility of nitrogen is dramatically enhanced by the presence of manganese, which also retains or improves the solubility of carbon thereby providing additional solid solution strengthening due to the presence of manganese and nitrogen, and combined carbon. Such solution strengthening enhances the high temperature precipitation-strengthening benefits of fine dispersions of NbC. Such solid solution effects also enhance the stability of the austenite matrix from resistance to excess sigma phase or chrome carbide formation at higher service temperatures. The presence of sulfides is substantially eliminated.

Mazias, Philip J. (Oak Ridge, TN); McGreevy, Tim (Morton, IL); Pollard,Michael James (East Peoria, IL); Siebenaler, Chad W. (Peoria, IL); Swindeman, Robert W. (Oak Ridge, TN)

2007-08-14T23:59:59.000Z

482

Novel synthesis process and structure refinements of Li4Mn5O12 for rechargeable lithium batteries  

Science Journals Connector (OSTI)

Well-crystallized Li4Mn5O12 powder with grain size of 0.1–0.4 ?m was prepared by heating a eutectic mixture of lithium acetate (LiOAc), and manganese nitrate (Mn(NO3)2), in an oxygen atmosphere. The structure of Li4Mn5O12 crystallites was found to be a cubic spinel using Rietveld refinement of both neutron and X-ray powder diffraction data. We confirmed that lithium ions occupy both the tetrahedral 8a sites, and part of the octahedral 16d sites, but not the 16c sites in the space group Fd3m, while all the manganese ions occupy the 16d sites. The lattice parameter was found to be sensitive to the synthesis temperature as a result of the variation in manganese valence. Samples prepared at 500 °C showed better electrode performance. A rechargeable capacity of about 135 mAh/g for the cell Li/Li4Mn5O12 was obtained in the 2.5–3.6 V range of cell voltages.

Toshimi Takada; Hiroshi Hayakawa; Etsuo Akiba; Fujio Izumi; Bryan C. Chakoumakos

1997-01-01T23:59:59.000Z

483

Electrochemical oxidation of Mn(OH){sub 2} in alkaline media  

SciTech Connect (OSTI)

Redox transformations of the Mn(II)/Mn(III) and Mn(II)/Mn(IV) pairs have been studied by transient electrochemical, spectroelectrochemical, and impedance measurements in alkaline solutions at a manganese electrode. The Mn(0)/Mn(II) and Mn(II)/Mn(III) pairs, which have not been clearly identified hitherto in the literature, have been observed using these techniques. A species observed at 285 nm during oxidation of the Mn(OH){sub 2}-covered manganese electrode was assigned to MnOOH. This species eventually led to passive films whose major component is MnO{sub 2} absorbing at about 400 nm. An accumulation of the passive films was observed at longer electrolysis times. Electrochemical impedance measurements were used to construct a Tafel plot for the manganese oxidation. The polarization resistance reached a minimum at about + 0.17 V vs Ag{vert_bar}AgCl (saturated KCl) without oxygen evolution. Some kinetic information including resistance-capacitance time constants for the oxidation reaction and an exchange current density are also reported.

Cha, D.K. [Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemistry; Park, S.M. [Pohang Univ. of Science and Technology (Korea, Republic of)

1997-08-01T23:59:59.000Z

484

Process for strontium-82 separation  

DOE Patents [OSTI]

A process for selective separation of strontium-82 and strontium-85 from proton irradiated molybdenum targets comprises dissolving the molybdenum target in a hydrogen peroxide solution to form a first solution containing ions selected from a group consisting of molybdenum, niobium, technetium, selenium, vanadium, arsenic, germanium, zirconium, rubidium, zinc, beryllium, cobalt, iron, manganese, chromium, strontium, and yttrium; passing the solution through a first cationic resin whereby ions selected from a group consisting of zinc, beryllium, cobalt, iron, manganese, chromium, strontium, yttrium a portion of zirconium and a portion of rubidium are selectively absorbed by the first resin; contacting the first resin with an acid solution to strip and remove the absorbed ions from the first cationic exchange resin to form a second solution; evaporating the second solution for a time sufficient to remove substantially all of the acid and water from the solution whereby a residue remains; dissolving the residue in a dilute acid to form a third solution; passing the third solution through a second cationic resin whereby the ions are absorbed by the second resin; contacting the second resin with a dilute sulfuric acid solution whereby the absorbed ions selected from the group consisting of rubidium, zinc, beryllium, cobalt, iron, manganese, chromium and zirconium are selectively removed from the second resin; and contacting the second resin with a dilute acid solution whereby the absorbed strontium ions are selectively removed. 1 fig.

Heaton, R.C.; Jamriska, D.J. Sr.; Taylor, W.A.

1992-12-01T23:59:59.000Z

485

In-situ Spectroscopy of Water Oxidation at Ir Oxide Nanocluster Drivenby Visible TiOCr Charge-Transfer Chromophore in Mesoporous Silica  

SciTech Connect (OSTI)

An all-inorganic photocatalytic unit consisting of a binuclear TiOCr charge-transfer chromophore coupled to an Ir oxide nanocluster has been assembled on the pore surface of mesoporous silica AlMCM-41. In situ FT-Raman and EPR spectroscopy of an aqueous suspension of the resulting IrxOy-TiCr-AlMCM-41 powder reveal the formation of superoxide species when exciting the Ti(IV)OCr(III) --> Ti(III)OCr(IV) metal-to-metal charge-transfer chromophore with visible light. Use of H218O confirms that the superoxide species originates from oxidation of water. Photolysis in the absence of persulfate acceptor leads to accumulation of Ti(III) instead. The results are explained by photocatalytic oxidation of water at Ir oxide nanoclusters followed by trapping of the evolving O2 by transient Ti(III) centers to yield superoxide. Given the flexibility to select donor metals with appropriate redox potential, photocatalytic units consisting of a binuclear charge-transfer chromophore coupled to a water oxidation catalyst shown here constitute a step towards thermodynamically efficient visible light water oxidation units.

Frei, Heinz; Han, Hongxian; Frei, Heinz

2008-06-03T23:59:59.000Z

486

Disproportionation in Li-O{sub 2} Batteries Based on a Large Surface Area Carbon Cathode  

SciTech Connect (OSTI)

In this paper we report on a kinetics study of the discharge process and its relationship to the charge overpotential in a Li-O{sub 2} cell for large surface area cathode material. The kinetics study reveals evidence for a first-order disproportionation reaction during discharge from an oxygen-rich Li{sub 2}O{sub 2} component with superoxide-like character to a Li{sub 2}O{sub 2} component. The oxygen-rich superoxide-like component has a much smaller potential during charge (3.2-3.5 V) than the Li{sub 2}O{sub 2} component (similar to 4.2 V). The formation of the superoxide-like component is likely due to the porosity of the activated carbon used in the Li-O{sub 2} cell cathode that provides a good environment for growth during discharge. The discharge product containing these two components is characterized by toroids, which are assemblies of nanoparticles. The morphologic growth and decomposition process of the toroids during the reversible discharge/charge process was observed by scanning electron microscopy and is consistent with the presence of the two components in the discharge product. The results of this study provide new insight into how growth conditions control the nature of discharge product, which can be used to achieve improved performance in Li-O{sub 2} cell.

Zhai, D.; Wang, H.-H.; Yang, J.; Lau, K. C.; Li, K.; Curtiss, L. A.; Amine, K. (Chemical Sciences and Engineering Division) [Chemical Sciences and Engineering Division

2013-10-16T23:59:59.000Z

487

Thermal storage for solar cooling using paired ammoniated salt reactors. Final report  

SciTech Connect (OSTI)

The objectives of the program were to investigate the feasibility of using various solid and liquid ammoniates in heat pump/thermal storage systems for space heating and cooling. The study included corrosion testing of selected metallic and non-metallic specimens in the ammoniates, subscale testing of the candidate ammoniates singly and in pairs, trade studies and conceptual design of a residential system, prototype testing, and ammoniation/deammoniation cyclic testing of manganese chloride. Results of the corrosion testing showed that problems exist with manganese and magnesium chloride ammoniates, except with the teflon which displayed excellent resistance in all environments. Also, all liquid ammoniates are unsuitable for use with uncoated carbon steel. Cycling of the manganese chloride between the high and low ammoniates does not affect its properties. However, the density change between the high and low ammoniates could cause packing problems in a reactor which constrains the salt volume. Subscale tests with solid ammoniates indicated that the heat transfer coefficient in a fixed bed reactor is low (approx. 1 Btu/h-ft/sup 2/-/sup 0/F). Therefore solid ammoniates are not practical because of the high heat exchanger cost requirement. Forced ammonia recirculation was tested as a means of increasing heat transfer rate in the fixed bed reactor with solid salts, but was not successful. Conversely, the subscale testing with liquid ammoniates produced heat transfer coefficients of 40 to 45 Btu/h-ft/sup 2/-/sup 0/F. Thus, the residential design was based on a liquid ammoniate/ammonia system using ammonium nitrate as the salt.

Not Available

1981-09-01T23:59:59.000Z

488

SSRL HEADLINES - December 2011  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

6 - December 2011 6 - December 2011 __________________________________________________________________________ Contents of this Issue: From the Director - Outreach and Support Efforts Science Highlight - Manganese-II Oxidation: A Biotic and Abiotic Process Science Highlight - Characterization of Iron Diazene Complexes in Two Oxidation States Biological SAXS Symposium - A Tribute to Dr. Hiro Tsuruta Awards - Prof. Harold Hwang Named American Physical Society Fellow Announcements - Shipping, Lightsources.org Survey, SSRL at the Exploratorium, NUFO Profile - Postdoc Eric Verploegen Energized by Experiences, Mentoring In the News - Metallurgy, Earth's Core, Nitrogenase __________________________________________________________________________ 1. From the Director: Outreach and Support Efforts

489

List of Reproductive Toxins and Highly Acute Toxic Materials  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Reproductive Toxins and Highly Acute Toxic Materials Reproductive Toxins and Highly Acute Toxic Materials Reproductive Toxins Acrylonitr ile Aniline Arsenic and its compounds Benzene Benzo(a)pyrene Beryllium Boric acid (Boron) Cadmium and its compounds Carbon monoxide Chlordecone (Kepone) Chloroform Chloroprene Dibromochloropropane (DBCP) Dichlorobenzene 1,1-Dichloroethane Dichloromethane Dioxane Epichlorohydrin Ethylene Dibromide Ethylene Dichloride Ethylene Oxide Fluorocarbons Formaldehyde Formamides Lead (Organic) Manganese and its compounds Mercury and its compounds (Inorganic) Methyl n-butyl ketone Methyl chloroform Methyl ethyl ketone (MEK) Nitrogen Dioxide Ozone Platinum and its compounds Polybrominated biphenyls (PBB) Polychlorinated bipenyls (PCB) Selenium and its compounds Styrene Tellurium and its compounds Tetr achloroethylene

490

SSRL HEADLINES Oct 2006  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

4 October, 2006 4 October, 2006 __________________________________________________________________________ Contents of this Issue: Science Highlight - Uranium-Hungry Bacteria Lead to Safer Water Supply Science Highlight - Uranium Trapped in Bacteriogenic Manganese Oxide Tunnels Roger Kornberg Wins the 2006 Chemistry Nobel Prize Another Successful Users' Meeting SSRL Awards Honor Mike Soltis and Bill Schlotter SSRL Users' Organization Executive Committee Update Ground Breaking New Science NIH-NCRR Officials Visit SSRL SESAME to Open: Particle Accelerator Spurs Middle East Science Partnership Beam Time Requests for X-ray/VUV Beam Lines and Macromolecular Crystallography Proposals Due December 1 Photon Science Job Opportunities __________________________________________________________________________

491

Theses | Stanford Synchrotron Radiation Lightsource  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Theses Theses 2013 Elizabeth L. Baxter, "Uncovering Allostery in a Uniquely Folded Metalloprotein", University of California San Diego, 2013; Advisor: P. A. Jennings Martja A. Beckwith, "X-ray Absorption and Emission Spectroscopy of Manganese Complexes Relevant to Photosystem II", Cornell University, 2013; Advisor: S. DeBeer Beate Fulda, "Changes in Copper and Cadmium Solubility and Speciation Induced by Soil Redox Dynamics - Competitive Metal Sulfide Formation and Interactions with Natural Organic Matter", ETH Zurich, 2013; Advisor: R. Kretzschmar Thomas D. Grant, "Understanding the Structure of Eukaryotic Glutaminyl-TRNA Synthetase: Combining X-ray Crystallography with Statistical Evaluations of Small Angle Scattering Data", State University of New York Buffalo, 2013;

492

Small plasma focus as neutron pulsed source for nuclides identification  

SciTech Connect (OSTI)

In this paper, we present preliminary results on the feasibility of employing a low energy (2 kJ, 31 kV) plasma focus device as a portable source of pulsed neutron beams (2.45 MeV) generated by nuclear fusion reactions D-D, for the “in situ” analysis of substances by nuclear activation. This source has the relevant advantage of being pulsed at requirement, transportable, not permanently radioactive, without radioactive waste, cheap, among others. We prove the feasibility of using this source showing several spectra of the characteristic emission line for manganese, gold, lead, and silver.

Milanese, M.; Moroso, R.; Barbaglia, M. [Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CONICET-UNCPBA), Pinto 399, Tandil 7000, Buenos Aires (Argentina) [Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires (CONICET-UNCPBA), Pinto 399, Tandil 7000, Buenos Aires (Argentina); Universidad del Centro de la Provincia de Buenos Aires (CONICET-UNCPBA), Pinto 399, Tandil 7000, Buenos Aires (Argentina); Niedbalski, J. [CONICET(Consejo Nacional de Investigaciones Científicas y Técnicas), Rivadavia 1917, Buenos Aires (Argentina)] [CONICET(Consejo Nacional de Investigaciones Científicas y Técnicas), Rivadavia 1917, Buenos Aires (Argentina); Mayer, R. [CNEA (Comisión Nacional de Energía Atómica), Av. Bustillo 9500, San Carlos de Bariloche, Rio Negro (Argentina)] [CNEA (Comisión Nacional de Energía Atómica), Av. Bustillo 9500, San Carlos de Bariloche, Rio Negro (Argentina); Castillo, F. [UNAM (Universidad Nacional Autónoma de México)–Circuito Exterior s/n, Ciudad Universitaria, Delg. Coyoacán, P.O. Box 70-543, México DF (Mexico)] [UNAM (Universidad Nacional Autónoma de México)–Circuito Exterior s/n, Ciudad Universitaria, Delg. Coyoacán, P.O. Box 70-543, México DF (Mexico); Guichón, S. [Universidad del Centro de la Provincia de Buenos Aires (CONICET-UNCPBA), Pinto 399, Tandil 7000, Buenos Aires (Argentina)] [Universidad del Centro de la Provincia de Buenos Aires (CONICET-UNCPBA), Pinto 399, Tandil 7000, Buenos Aires (Argentina)

2013-10-15T23:59:59.000Z

493

Oxidation resistant alloys, method for producing oxidation resistant alloys  

DOE Patents [OSTI]

A method for producing oxidation-resistant austenitic alloys for use at temperatures below 800.degree. C. comprising of: providing an alloy comprising, by weight %: 14-18% chromium, 15-18% nickel, 1-3% manganese, 1-2% molybdenum, 2-4% silicon, 0% aluminum and the balance being iron; heating the alloy to 800.degree. C. for between 175-250 hours prior to use in order to form a continuous silicon oxide film and another oxide film. The method provides a means of producing stainless steels with superior oxidation resistance at temperatures above 700.degree. C. at a low cost

Dunning, John S. (Corvallis, OR); Alman, David E. (Salem, OR)

2002-11-05T23:59:59.000Z

494

Growth and mortality of two groups of oysters, Crassostrea virginica (GMELIN), subjected to water from a steam-electric generating station  

E-Print Network [OSTI]

temperatures taken simul- taneously with a glass mercury thermometer indicated that the Ryan thermometers were off as much as O'C. Surface salinities (to the nearest 0. Sr?) were taken scm monthly starting 6 january, 1972 for each areo using a Go!dberg '1... absorption method was used to analyze the tissue for arsernc, mercury, lead, copper, manganese, i. on, cobalt and zinc by the Texas ASM Uni- versity Agricultural Analytical Service on 20 February, 1973. Oyster spat and/or fouling organisms were collected...

Gilmore, Gill Hobart

2012-06-07T23:59:59.000Z

495

Vitamin B?? and unidentified factors in poultry nutrition  

E-Print Network [OSTI]

of chicks and poults. Proc. 7th Distillers Feed Conference, pp. 59-71. Couch, J. R., J. R. Reed, Jr., R. L. Atkinson and B. E. Welch 1951 Distillers grain solubles and dried whey with an APF concentrate in broiler feeds. Proc. 6th Distillers Feed... on experiment. This ration consisted of 65% corn, 25$ soybean oil meal, 2% oyster shell, 1.5$ defluorinated rock phosphate, 0.5$ salt, 0.0125$ manganese sulfate, 2% whey, and 4$ fish meal. In addition, the following were added in the specified number...

Welch, Billy E.

2013-10-04T23:59:59.000Z

496

Neutron Activation Cross Sections with Sb—Be Neutrons  

Science Journals Connector (OSTI)

The neutron activation cross sections near 25 kev have been measured for about 50 nuclei. Gamma-ray scintillation spectrometers with known efficiency were used to compare the radioactivities produced by the several nuclei with I128. This gave a significant increase in sensitivity and precision over direct beta-counting methods in many cases. Absolute standardization was obtained through scintillation-beta-counting the I128 in NaI(Tl) crystals irradiated with a neutron source calibrated by the manganese bath technique.

R. L. Macklin; N. H. Lazar; W. S. Lyon

1957-07-15T23:59:59.000Z

497

Zinc phosphate conversion coatings  

DOE Patents [OSTI]

Zinc phosphate conversion coatings for producing metals which exhibit enhanced corrosion prevention characteristics are prepared by the addition of a transition-metal-compound promoter comprising a manganese, iron, cobalt, nickel, or copper compound and an electrolyte such as polyacrylic acid, polymethacrylic acid, polyitaconic acid and poly-L-glutamic acid to a phosphating solution. These coatings are further improved by the incorporation of Fe ions. Thermal treatment of zinc phosphate coatings to generate .alpha.-phase anhydrous zinc phosphate improves the corrosion prevention qualities of the resulting coated metal.

Sugama, Toshifumi (Wading River, NY)

1997-01-01T23:59:59.000Z

498

Zinc phosphate conversion coatings  

DOE Patents [OSTI]

Zinc phosphate conversion coatings for producing metals which exhibit enhanced corrosion prevention characteristics are prepared by the addition of a transition-metal-compound promoter comprising a manganese, iron, cobalt, nickel, or copper compound and an electrolyte such as polyacrylic acid, polymethacrylic acid, polyitaconic acid and poly-L-glutamic acid to a phosphating solution. These coatings are further improved by the incorporation of Fe ions. Thermal treatment of zinc phosphate coatings to generate {alpha}-phase anhydrous zinc phosphate improves the corrosion prevention qualities of the resulting coated metal. 33 figs.

Sugama, T.

1997-02-18T23:59:59.000Z

499

A study of the reaction between metal ions and thiomalic acid  

E-Print Network [OSTI]

(II), chromium(III), chromium(VI)(dichromate ion), co'balt(II), copper(II), iron(II1), lead(II ), mercury- ( II), molybdenum(VI)(molybdate ion), nickel(II), silver(I ), and zinc(II). Of these, only copper gave a titration which was of analytical precision...(III), lead(II), manganese(II), mercury(II), molybdenum(VI) (molybdate ion), nickel(II), silver(I), tin(1V), and zinc(II). No reactions were observed between thiomalic acid and the ions: aluminum- (III), chromium(III), and thorium(IV). Under the conditions...

Michel, Clyde Ernest

1963-01-01T23:59:59.000Z

500

Water Quality: Its Relationship to Livestock  

E-Print Network [OSTI]

concen- trations. Examples are iron, copper, cobalt, zinc, iodide and manganese. These elements do not seem to accumu- late in meat or milk to the extent that they would cause a problem. The most common water quality problems affecting livestock... 0.002 0.01 0.01 Molybdenum Not established No limit Nickel 1.0 Nitrate-N 10.0 100 300 Nitrite-N 10 10 Salinity See Table 2 Selenium 0.01 Silver 0.05 Sulfate e 250 Total Dissolved Solids e 500 Vanadium 0.1 1.0 Zinc 5.0 25...

Faries Jr., Floron C.; Sweeten, John M.; Reagor, John C.

1998-06-30T23:59:59.000Z