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Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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
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1

OUTLOOK: Specialty crops and methyl bromide alternatives: Taking stock after 7 years  

E-Print Network (OSTI)

to Outlook Specialty crops and methyl bromide alternatives:Research Plant Pathologist, Crops Pathology and GeneticsS Jack Kelly Clark pecialty crop farms and nurseries in

Browne, Greg T

2013-01-01T23:59:59.000Z

2

Methyl Bromide o Bromomethane, monobromomethane, isobrome, Brom-o-Gas, Bromomethane, Celume,  

E-Print Network (OSTI)

bromide produced in the U.S. goes into pesticidal formulations (as of 1996) Total use of 711,175 lb in 2009, 78% on imported and 22% on exported material under Plant Protection and Quarantine oversight of exports requiring MB fumigation in 2005-2009 $2.2 billion/year o Methylating solvent, low-boiling solvent

Toohey, Darin W.

3

Headspace gas chromatographic method for determination of methyl bromide in food ingredients  

SciTech Connect

A headspace gas chromatographic (GC) method, which can be automated, has been developed for determination of methyl bromide. This method has been applied to wheat, flour, cocoa, and peanuts. Samples to be analyzed are placed in headspace sample vials, water is added, and the vials are sealed with Teflon-lined septa. After an appropriate equilibration time at 32 degrees C, the samples are analyzed within 10 h. A sample of the headspace is withdrawn and analyzed on a gas chromatograph equipped with an electron capture detector (ECD). Methyl bromide levels were quantitated by comparison of peak area with a standard. The standard was generated by adding a known amount of methyl bromide to a portion of the matrix being analyzed and which was known to be methyl bromide free. The detection limit of the method was 0.4 ppb. The coefficient of variation (CV) was 6.5% for wheat, 8.3% for flour, 3.3% for cocoa, and 11.6% for peanuts.

DeVries, J.W.; Broge, J.M.; Schroeder, J.P.; Bowers, R.H.; Larson, P.A.; Burns, N.M.

1985-11-01T23:59:59.000Z

4

Photochemistry of Methyl Bromide on the ?-Cr2O3(0001) Surface  

Science Conference Proceedings (OSTI)

The photochemical properties of the Cr-terminated ?-Cr2O3(0001) surface were explored using methyl bromide (CH3Br) as a probe molecule. CH3Br adsorbed and desorbed molecularly from the Cr-terminated ?-Cr2O3(0001) surface without detectable thermal decomposition. Temperature programmed desorption (TPD) revealed a CH3Br desorption state at 240 K for coverages up to 0.5 ML, followed by more weakly bound molecules desorbing at 175 K for coverages up to 1 ML. Multilayer exposures led to desorption at ~130 K. The CH3Br sticking coefficient was unity at 105 K for coverages up to monolayer saturation, but decreased as the multilayer formed. In contrast, pre-oxidation of the surface (using an oxygen plasma source) led to capping of surface Cr3+ sites and near complete removal of CH3Br TPD states above 150 K. The photochemistry of chemisorbed CH3Br was explored on the Cr-terminated surface using post-irradiation TPD and photon stimulated desorption (PSD). Irradiation of adsorbed CH3Br with broad band light from a Hg arc lamp resulted in both photodesorption and photodecomposition of the parent molecule at a combined cross section of ~10-22 cm2. Parent PSD was indicative of molecular photodesorption, but CH3 was also detected in PSD and Br atoms were left on the surface, both reflective of photo-induced CH3-Br bond dissociation. Use of a 385 nm cut-off filter effectively shut down the photodissociation pathway but not the parent molecule photodesorption process. From these observations it is inferred that d-to-d transitions in ?-Cr2O3, occurring at photon energies <3 eV, are not responsible for photodecomposition of 2 adsorbed CH3Br. It is unclear to what extent band-to-band versus direct CH3Br photolysis play in CH3-Br bond dissociation initiated by more energetic photons.

Henderson, Michael A.

2010-09-30T23:59:59.000Z

5

OUTLOOK: Specialty crops and methyl bromide alternatives: Taking stock after 7 years  

E-Print Network (OSTI)

finding alternatives to Outlook Specialty crops and methylNumber 3 Steve Fennimore Outlook Non-fumigant approaches to

Browne, Greg T

2013-01-01T23:59:59.000Z

6

A High-Volume Cryosampler and Sample Purification System for Bromine Isotope Studies of Methyl Bromide  

Science Conference Proceedings (OSTI)

A system was developed for collecting from the ambient atmosphere the methyl halides CH3Cl and CH3Br in quantities sufficient for chlorine and bromine isotope analysis. The construction and operation of the novel cryogenic collection system (...

Brett F. Thornton; Axel Horst; Daniel Carrizo; Henry Holmstrand; Per Andersson; Patrick M. Crill; Örjan Gustafsson

7

A High-Volume Cryosampler and Sample Purification System for Bromine Isotope Studies of Methyl Bromide  

Science Conference Proceedings (OSTI)

A system was developed for collecting from the ambient atmosphere the methyl halides CH3Cl and CH3Br in quantities sufficient for chlorine and bromine isotope analysis. The construction and operation of the novel cryogenic collection system (...

Brett F. Thornton; Axel Horst; Daniel Carrizo; Henry Holmstrand; Per Andersson; Patrick M. Crill; Örjan Gustafsson

2013-09-01T23:59:59.000Z

8

Europium-doped barium bromide iodide  

SciTech Connect

Single crystals of Ba0.96Eu0.04BrI (barium europium bromide iodide) were grown by the Bridgman technique. The title compound adopts the ordered PbCl2 structure [Braekken (1932). Z. Kristallogr. 83, 222-282]. All atoms occupy the fourfold special positions (4c, site symmetry m) of the space group Pnma with a statistical distribution of Ba and Eu. They lie on the mirror planes, perpendicular to the b axis at y = +-0.25. Each cation is coordinated by nine anions in a tricapped trigonal prismatic arrangement.

Gundiah, Gautam; Hanrahan, Stephen M.; Hollander, Fredrick J.; Bourret-Courchesne, Edith D.

2009-10-21T23:59:59.000Z

9

Forest nurseries face critical choices with the loss of methyl bromide fumigation  

E-Print Network (OSTI)

seedlings over mature composts in USDA Forest Serviceseedlings planted into compost-amended soil that had eitherbio- solid and bark-based composts had the highest average

Weiland, Jerry E; Littke, Will R; Haase, Diane L

2013-01-01T23:59:59.000Z

10

Methyl Ester Sulfonates Supplement  

Science Conference Proceedings (OSTI)

Methyl Ester Sulfonates Supplement 18509 September 2006 Supplement September 2006.pdf Chemithon 3179

11

Lithium bromide absorption chiller passes gas conditioning field test  

Science Conference Proceedings (OSTI)

A lithium bromide absorption chiller has been successfully used to provide refrigeration for field conditioning of natural gas. The intent of the study was to identify a process that could provide a moderate level of refrigeration necessary to meet the quality restrictions required by natural-gas transmission companies, minimize the initial investment risk, and reduce operating expenses. The technology in the test proved comparatively less expensive to operate than a propane refrigeration plant. Volatile product prices and changes in natural-gas transmission requirements have created the need for an alternative to conventional methods of natural-gas processing. The paper describes the problems with the accumulation of condensed liquids in pipelines, gas conditioning, the lithium bromide absorption cycle, economics, performance, and operating and maintenance costs.

Lane, M.J.; Huey, M.A. [Nicol and Associates, Richardson, TX (United States)

1995-07-31T23:59:59.000Z

12

WATER-LITHIUM BROMIDE DOUBLE-EFFECT ABSORPTION COOLING ANALYSIS  

Office of Scientific and Technical Information (OSTI)

WATER-LITHIUM BROMIDE DOUBLE-EFFECT WATER-LITHIUM BROMIDE DOUBLE-EFFECT ABSORPTION COOLING ANALYSIS Gary C . V l i e t , Michael B . Lawson, and Rudolf0 A . Lithgow Center f o r Energy Studies The University of Texas a t Austin December 1980 Final Report f o r Contract: DE AC03-79SF10540 (Mu1 tiple-Effect Absorption Cycle Solar Cooling) with the U.S. Department of Energy DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency Thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately

13

Atmospheric Methyl Chloride  

NLE Websites -- All DOE Office Websites (Extended Search)

steel flasks and methyl chloride concentrations were measured using an Electron Capture Gas Chromatograph. Concentrations are reported as mixing ratios in dry air. The...

14

Unveiling Residual Molecular Binding in Triply Charged Hydrogen Bromide  

Science Conference Proceedings (OSTI)

We present an experimental and theoretical study of triply charged hydrogen bromide ions formed by photoionization of the inner 3d shell of Br. The experimental results, obtained by detecting the 3d photoelectron in coincidence with the two subsequent Auger electrons, are analyzed using calculated potential energy curves of HBr{sup 3+}. The competition between the short-range chemical binding potential and the Coulomb repulsion in the dissociative process is shown. Two different mechanisms are observed for double Auger decay: one, a direct process with simultaneous ejection of two Auger electrons to final HBr{sup 3+} ionic states and the other, a cascade process involving double Auger decay characterized by the autoionization of Br*{sup +} ion subsequent to the HBr{sup 2+} fragmentation.

Penent, F.; Lablanquie, P.; Palaudoux, J.; Gamblin, G.; Carniato, S. [UPMC, Universite Paris 06, LCPMR, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05 (France)] [CNRS, LCPMR (UMR 7614), 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05 (France); Andric, L. [UPMC, Universite Paris 06, LCPMR, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05 (France)] [CNRS, LCPMR (UMR 7614), 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05 (France)] [Universite Paris-Est, 5 boulevard Descartes, 77454 Marne-la-Vallee Cedex 2 (France); Hikosaka, Y. [Department of Environmental Science, Niigata University, Niigata 950-2181 (Japan); Ito, K. [Photon Factory, Institute of Materials Structure Science, Oho, Tsukuba 305-0801 (Japan)

2011-03-11T23:59:59.000Z

15

Water-lithium bromide double-effect absorption cooling analysis  

SciTech Connect

A numerical model was developed for the transient simulation of the double-effect, water-lithium bromide absorption cooling machine, and the use of the model to determine the effect of the various design and input variables on the absorption unit performance. The performance parameters considered were coefficient of performance and cooling capacity. The sensitivity analysis was performed by selecting a nominal condition and determining performance sensitivity for each variable with others held constant. The variables considered in the study include source hot water, cooling water, and chilled water temperatures; source hot water, cooling water, and chilled water flow rates; solution circulation rate; heat exchanger areas; pressure drop between evaporator and absorber; solution pump characteristics; and refrigerant flow control methods. The performance sensitivity study indicated in particular that the distribution of heat exchanger area among the various (seven) heat exchange components is a very-important design consideration. Moreover, it indicated that the method of flow control of the first effect refrigerant vapor through the second effect is a critical design feature when absorption units operate over a significant range of cooling capacity. The model was used to predict the performance of the Trane absorption unit with fairly good accuracy.

Vliet, G.C.; Lawson, M.B.; Lithgow, R.A.

1980-12-01T23:59:59.000Z

16

Evaluation of Alkali Bromide Salts for Potential Pyrochemical Applications  

SciTech Connect

Transient techniques were employed to study the electrochemical behavior, reduction mechanism and transport properties of REBr3 (RE - La, Nd and Gd) in pure LiBr, LiBr-KBr (eutectic) and LiBr-KBr-CsBr (eutectic) melts. Gd(III) showed a reversible single step soluble-insoluble exchange phenomenon in LiBr melt at 973K. Although La (III), Nd(III) and Gd(III) ions showed reversible behavior in eutectic LiBr-KBr melts, these ions showed a combination of temperature dependent reversible and pseudo-reversible behavior. While both La(III) and Gd(III) showed one step reduction, the reduction of Nd(III) was observed to be a two step process. La metal could be electrodeposited from the ternary electrolyte at a temperature of 673K. Various electrochemical measurements suggest that both binary and ternary bromide melts can potentially be used to electrodeposit high purity RE metals at comparatively lower operating temperatures.

Prabhat K. Tripathy; Steven D. Herrmann; Guy L. Fredrickson; Tedd E. Lister; Toni Y. Gutknecht

2013-10-01T23:59:59.000Z

17

Evaluation of pyrethrin aerosol insecticide as an alternative to methyl bromide for pest control in flour mills.  

E-Print Network (OSTI)

??Experiments were conducted to assess the effects of direct and indirect exposure scenarios, different degrees of residual flour, open and obstructed positions, and seasonal temperature… (more)

Kharel, Kabita

2013-01-01T23:59:59.000Z

18

CHEMICAL EFFECTS OF PHOTONUCLEAR REACTIONS IN THE PROPYL BROMIDES  

SciTech Connect

When nuclear reactions occur in atoms in molecules chemical changes follow as a result of the recoil of the product atoms. The nature of these chemical changes was studied intensively for a number of systems but in most cases the magnitude of the recoil energy was about the same. In the present studies use was made of a much greater recoil energy than that normally used. The reaction Br( gamma ,n)Br* gives a recoil bromine atom with an energy of the order of 10/sup 5/ ev, compared to 10/sup 2/ ev for the product of the Br(n, gamma )Br* reaction which is ususlly used. The chemical nature of the products resulting when the propyl bromides were irradiated with neutrons and 70-Mev gamma rays was studied by established techniques. It is possible to differentiate between the reactions which occur while the recoiling bromine atom still is highly energetic, or hot,'' and those which occur after it has been slowed down to thermal energies. The products of the hot reactions show little dependence on the intial recoil energy. In the case of the thermal reactions, the higher energy recoil produces a greater number of products which are different from the original molecules. This can be attributed to the presence of a higher concentration of free radical fragments which are produced in slowing down the higher energy recoiling atom. These fragments combine with the radioactive bromine after it has reached thermal energies to form a greater variety and amount of new products. (auth)

Richardson, A.E.; Voigt, A.F.

1956-12-01T23:59:59.000Z

19

Utility of Bromide and Heat Tracers for Aquifer Characterization Affected by Highly Transient Flow Conditions  

SciTech Connect

A tracer test using both bromide and heat tracers conducted at the Integrated Field Research Challenge site in Hanford 300 Area (300A), Washington, provided an instrument for evaluating the utility of bromide and heat tracers for aquifer characterization. The bromide tracer data were critical to improving the calibration of the flow model complicated by the highly dynamic nature of the flow field. However, most bromide concentrations were obtained from fully screened observation wells, lacking depth-specific resolution for vertical characterization. On the other hand, depth-specific temperature data were relatively simple and inexpensive to acquire. However, temperature-driven fluid density effects influenced heat plume movement. Moreover, the temperature data contained “noise” caused by heating during fluid injection and sampling events. Using the hydraulic conductivity distribution obtained from the calibration of the bromide transport model, the temperature depth profiles and arrival times of temperature peaks simulated by the heat transport model were in reasonable agreement with observations. This suggested that heat can be used as a cost-effective proxy for solute tracers for calibration of the hydraulic conductivity distribution, especially in the vertical direction. However, a heat tracer test must be carefully designed and executed to minimize fluid density effects and sources of noise in temperature data. A sensitivity analysis also revealed that heat transport was most sensitive to hydraulic conductivity and porosity, less sensitive to thermal distribution factor, and least sensitive to thermal dispersion and heat conduction. This indicated that the hydraulic conductivity remains the primary calibration parameter for heat transport.

Ma, Rui; Zheng, Chunmiao; Zachara, John M.; Tonkin, Matthew J.

2012-08-29T23:59:59.000Z

20

Controlling DNA Methylation  

NLE Websites -- All DOE Office Websites (Extended Search)

Controlling DNA Methylation Though life on earth is composed of a diverse range of organisms, some with many different types of tissues and cells, all these are encoded by a molecule we call DNA. The information required to build a protein is stored in DNA within the cells. Not all the message in the DNA is used in each cell and not all the message is used all the time. During cell differentiation, the cells become dedicated for their specific function which involves selectively activating some genes and repressing others. Gene regulation is an important event in the developmental biology and the biology of various diseases, but a more complex process. Controlling DNA Methylation Though life on earth is composed of a diverse range of organisms, some with many different types of tissues and cells, all these are encoded by a molecule we call DNA. The information required to build a protein is stored in DNA within the cells. Not all the message in the DNA is used in each cell and not all the message is used all the time. During cell differentiation, the cells become dedicated for their specific function which involves selectively activating some genes and repressing others. Gene regulation is an important event in the developmental biology and the biology of various diseases, but a more complex process. In the bacteria there are distinct enzymes while one is capable of cleaving DNA, the other protects DNA by modification. The complementary function provided by the set of enzymes offers a defense mechanism against the phage infection and DNA invasion. The incoming DNA is cleaved sequence specifically by the class of enzymes called restriction endonuclease (REase). The host DNA is protected by the sequence specific action of matching set of enzymes called the DNA methyltransferase (MTase). The control of the relative activities of the REase and MTase is critical because a reduced ratio of MTase/REase activity would lead to cell death via autorestriction. However too high a ratio would fail to provide protection against invading viral DNA. In addition a separate group of proteins capable of controlling R-M proteins have been identified in various restriction-modification (R-M) systems which are called C proteins (Roberts et al., 2003).

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

T ti E St S tTetiaroa Energy Storage System Estimated ZBB Zinc Bromide Battery Performance and Costs  

E-Print Network (OSTI)

T ti E St S tTetiaroa Energy Storage System Estimated ZBB Zinc Bromide Battery Performance and Costs Prull / KammenPrull / Kammen Renewable and Appropriate Energy Lab, UC Berkeley 7/26/2010 http

Kammen, Daniel M.

22

Conversion of Levulinic Acid to Methyl Tetrahydrofuran ...  

Biomass and Biofuels Conversion of Levulinic Acid to Methyl Tetrahydrofuran Pacific Northwest National Laboratory. Contact PNNL About This Technology ...

23

Conversion of Levulinic Acid to Methyl Tetrahydrofuran ...  

Search PNNL. PNNL Home; About; Research; Publications; Jobs; News; Contacts; Conversion of Levulinic Acid to Methyl Tetrahydrofuran. Battelle ...

24

Combustion characterization of methylal in reciprocating engines  

DOE Green Energy (OSTI)

Methylal, CH{sub 3}OCH{sub 2}OCH{sub 3}, also known as dimethoxy-methane, is unique among oxygenates in that it has a low autoignition temperature, no carbon-carbon bonds, and is soluble in middle distillate fuels. Because of these properties, methylal has been shown to be a favorable fuel additive for reducing smoke in diesel engines. Recent measurements of ignition delay times indicate that methylal has a cetane number in the range of 45-50, which is compatible with diesel fuels. Engine tests have shown that adding methylal to diesel fuel significantly reduces smoke emissions. Gaseous emissions and combustion efficiencies obtained with methylal/diesel fuel blends remain essentially the same as those measured using neat diesel fuel. Lubricity measurements of methylal/diesel fuel blends with a ball on cylinder lubrication evaluator (BOCLE) show that methylal improves the lubricity of diesel fuel. Even though additions of methylal lower the fuel viscosity, the results of the BOCLE tests indicate that the methylal/diesel fuel blends cause less pump wear than neat diesel fuel. The one drawback is that methylal has a low boiling point (42{degrees}C) and a relatively high vapor pressure. As a result, it lowers the flash point of diesel fuel and causes a potential fuel tank flammability hazard. One solution to this increased volatility is to make polyoxymethylenes with the general formula of CH{sub 3}O(CH{sub 2}O){sub x}CH{sub 3} where x > 2. The molecules are similar to methylal, but have higher molecular weights and thus higher viscosities and substantially lower vapor pressures. Therefore, their flash points will be compatible with regular diesel fuel. The polyoxymethylenes are expected to have combustion properties similar to methylal. It is theorized that by analogy with hydrocarbons, the ignition quality (i.e., cetane number) of the polyoxymethylenes will be better than that of methylal.

Dodge, L.; Naegeli, D. [Southwest Research Institute, San Antonio, TX (United States)

1994-06-01T23:59:59.000Z

25

Effect of surfactant additive on pool boiling of concentrated lithium bromide solution  

SciTech Connect

The measurements of nucleate pool boiling heat transfer rate and surface tension were made for pure water and 50 wt.% lithium bromide solution with various amounts of n-octanol. Regardless of low concentration, n-octanol additive depresses considerably the surface tension of the liquids. The pool boiling data, however, reveal that the addition of surfactant results in insignificant enhancement of heat transfer for both pure water and the concentrated LiBr solution. With the results of this work, the performance improvement received from using n-octanol additive in working liquid of an absorption heat pump (AHP) is consequently due to the enhancement of heat and mass transfer in the absorber (but not generator) by the induced interfacial turbulence.

Wu, W.T.; Yang, Y.M.; Maa, J.R. [National Cheng Kung Univ., Tainan (Taiwan, Province of China). Dept. of Chemical Engineering] [National Cheng Kung Univ., Tainan (Taiwan, Province of China). Dept. of Chemical Engineering

1998-11-01T23:59:59.000Z

26

Detailed Chemical Kinetic Reaction Mechanism for Biodiesel Components Methyl Stearate and Methyl Oleate  

DOE Green Energy (OSTI)

New chemical kinetic reaction mechanisms are developed for two of the five major components of biodiesel fuel, methyl stearate and methyl oleate. The mechanisms are produced using existing reaction classes and rules for reaction rates, with additional reaction classes to describe other reactions unique to methyl ester species. Mechanism capabilities were examined by computing fuel/air autoignition delay times and comparing the results with more conventional hydrocarbon fuels for which experimental results are available. Additional comparisons were carried out with measured results taken from jet-stirred reactor experiments for rapeseed methyl ester fuels. In both sets of computational tests, methyl oleate was found to be slightly less reactive than methyl stearate, and an explanation of this observation is made showing that the double bond in methyl oleate inhibits certain low temperature chain branching reaction pathways important in methyl stearate. The resulting detailed chemical kinetic reaction mechanism includes more approximately 3500 chemical species and more than 17,000 chemical reactions.

Naik, C; Westbrook, C K; Herbinet, O; Pitz, W J; Mehl, M

2010-01-22T23:59:59.000Z

27

EXTRACTION OF TETRAVALENT PLUTONIUM VALUES WITH METHYL ETHYL KETONE, METHYL ISOBUTYL KETONE ACETOPHENONE OR MENTHONE  

DOE Patents (OSTI)

A process is described for extracting tetravalent plutonium from an aqueous acid solution with methyl ethyl ketone, methyl isobutyl ketone, or acetophenone and with the extraction of either tetravalent or hexavalent plutonium into menthone. (AEC)

Seaborg, G.T.

1961-08-01T23:59:59.000Z

28

EA-1157: Methyl Chloride via Oxyhydrochlorination of Methane...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

1157: Methyl Chloride via Oxyhydrochlorination of Methane: A Building Black for Chemicals and Fuels from Natural Gas, Carrollton, Kentucky EA-1157: Methyl Chloride via...

29

Simulation and performance analysis of a quadruple-effect lithium bromide-water absorption  

Science Conference Proceedings (OSTI)

In order to investigate the possibility of improving utilization of high temperature heat sources, such as natural gas, for absorption chillers, performance simulation has been conducted for a quadruple-effect lithium bromide-water cycle, capable of substantial performance improvement over state-of-the-art double-effect cycles. The system investigated includes four condensers and four desorbers coupled together, forming an extension of the conventional double-effect cycle; based on prior experience, a parallel flow system was perferred over series flow, and double-condenser coupling (DCC) was employed, extending from triple-effect cycles, to further improve performance. A modular computer code for simulation of absorption systems (ABSIM) was used to investigate the performances of the cycle. The simulation was carried out over a range of operating conditions, including investigation of the influence of some major design parameters. A coefficient of performance in the neighborhood of 2.0 (cooling) was calculated at the design point, with a heat supply temperature of 600{degrees}F at the solution outlet from the high temperature desorber. With some optimization of the weak (pumped) solution flowrate and of the solution split among the four desorbers, this COP may be raised above 2.2, without any increase in the heat transfer surface of the system`s components.

Grossman, G. [Technion-Israel Inst. of Tech., Haifa (Israel). Faculty of Mechanical Engineering; Zaltash, A.; DeVault, R.C. [Oak Ridge National Lab., TN (United States)

1994-04-01T23:59:59.000Z

30

Simulation and performance analysis of a 4-effect lithium bromide-water absorption chiller  

Science Conference Proceedings (OSTI)

Performance simulation has been conducted for a 4-effect lithium bromide-water chiller, capable of substantial performance improvement over state-of-the-art double-effect cycles. The system investigated includes four condensers and four desorbers coupled together, forming an extension of the conventional double-effect cycle; based on prior analytical studies, a parallel flow system was preferred over series flow, and double-condenser coupling was employed, to further improve performance. A modular computer code for simulation of absorption systems (ABSIM) was used to investigate the performances of the cycle. The simulation was carried out to investigate the influence of some major design parameters. A coefficient of performance around 2.0 (cooling) was calculated at the design point, with a heat supply temperature of 600{degrees}F (315{degrees}C) at the solution outlet from the high temperature desorber. With some optimization of the weak (pumped) solution flowrate and of the solution split among the four desorbers, this COP may be raised above 2.2.

Grossman, G. [Technion-Israel Institute of Technology, Haifa (Israel); Zaltash, A.; DeVault, R.C. [Oak Ridge National Lab., TN (United States)

1995-02-01T23:59:59.000Z

31

Thermophysical Properties of Lithium Bromide + 1, 2-Propanediol Aqueous Solutions Solubility, Density and Viscosity  

SciTech Connect

The solubilities, densities and viscosities of lithium bromide (LiBr) + 1, 2-propanediol (HO-CH2-CHOH-CH3) aqueous solution (mass ratio of LiBr/HO-CH2-CHOH-CH3 = 3.5, 4.5 and 5.5) were measured in the mass fraction range from 0.30 to 0.75. Solubility measurements were performed by the visual method in the temperature range of (271.15 to 345.15) K. The density measurements were made using an automated vibrating tube density meter, and the viscosity measurements were carried out with an automated falling-ball viscometer in the temperature range of (293.15 to 363.15) K. The density and viscosity data were correlated with appropriate regression equations as a function of the mass fraction and temperature. The maximum average absolute deviations (AAD) between experimental and correlated data were 0.08% and 1.51% for densities and viscosities, respectively.

Wang, Kai [ORNL; Abdelaziz, Omar [ORNL; Vineyard, Edward Allan [ORNL

2012-01-01T23:59:59.000Z

32

Crystallization Temperature of Aqueous Lithium Bromide Solutions at Low Evaporation Temperature  

Science Conference Proceedings (OSTI)

Water- aqueous Lithium Bromide (LiBr) solutions have shown superior performance as working fluid pairs for absorption refrigeration cycles. Most of the available literature (e.g. ASHRAE Handbook of Fundamentals, etc.) provide crystallization behavior down to only 10 C. The typical evaporating temperature for an absorption chiller system is usually lower than 10 C. Hence, it is essential to have an accurate prediction of the crystallization temperature in this range in order to avoid crystallization during the design phase. We have therefore conducted a systematic study to explore the crystallization temperatures of LiBr/Water solutions that fall below an evaporating temperature of 10 C. Our preliminary studies revealed that the rate of cooling of the sample solution influences the crystallization temperature; therefore we have performed a quasi steady test where the sample was cooled gradually by reducing the sample temperature in small steps. Results from this study are reported in this paper and can be used to extend the data available in open literature.

Kisari, Padmaja [ORNL; Wang, Kai [ORNL; Abdelaziz, Omar [ORNL; Vineyard, Edward Allan [ORNL

2010-01-01T23:59:59.000Z

33

Production of hydrogen bromide by bromine-methane reactions at elevated temperature.  

SciTech Connect

Hydrogen bromide is a potentially useful intermediate for hydrogen production by electrolysis because it has a low cell potential and is extremely soluble in water. Processes have been proposed to exploit these properties, but among the important issues to be resolved is the efficiency of HBr production from hydrocarbon precursors. This investigation evaluated a fundamental facet of such a technology by studying the reaction of methane and bromine at elevated temperature to determine the yield and kinetics of HBr formation. Laboratory experimentation and computational chemistry were combined to provide a description of this reaction for possible application to reactor design at a larger scale. Experimental studies with a tubular flow reactor were used to survey a range of reactant ratios and reactor residence times at temperatures between 500 C and 800 C. At temperatures near 800 C with excess methane, conversions of bromine to HBr exceeded 90% and reaction products included solid carbon (soot) in stoichiometric amounts. At lower temperatures, HBr conversion was significantly reduced, the products included much less soot, and the formation of bromocarbon compounds was indicated qualitatively. Calculations of chemical equilibrium behavior and reaction kinetics for the experimental conditions were performed using the Sandia CHEMKIN package. An elementary multistep mechanism for the gas-phase chemistry was used together with a surface mechanism that assumed facile deposition of radical species at the reactor walls. Simulations with the laminar-flow boundary-layer code of the CHEMKIN package gave reasonable agreement with experimental data.

Bradshaw, Robert W.; Larson, Richard S.

2003-05-01T23:59:59.000Z

34

Water-lithium bromide double-effect absorption cooling analysis. Final report  

DOE Green Energy (OSTI)

This investigation involved the development of a numerical model for the transient simulation of the double-effect, water-lithium bromide absorption cooling machine, and the use of the model to determine the effect of the various design and input variables on the absorption unit performance. The performance parameters considered were coefficient of performance and cooling capacity. The sensitivity analysis was performed by selecting a nominal condition and determining performance sensitivity for each variable with others held constant. The variables considered in the study include source hot water, cooling water, and chilled water temperatures; source hot water, cooling water, and chilled water flow rates; solution circulation rate; heat exchanger areas; pressure drop between evaporator and absorber; solution pump characteristics; and refrigerant flow control methods. The performance sensitivity study indicated in particular that the distribution of heat exchanger area among the various (seven) heat exchange components is a very important design consideration. Moreover, it indicated that the method of flow control of the first effect refrigerant vapor through the second effect is a critical design feature when absorption units operate over a significant range of cooling capacity. The model was used to predict the performance of the Trane absorption unit with fairly good accuracy. The dynamic model should be valuable as a design tool for developing new absorption machines or modifying current machines to make them optimal based on current and future energy costs.

Vliet, G.C.; Lawson, M.B.; Lithgow, R.A.

1980-12-01T23:59:59.000Z

35

Spectroscopic study of tetradecyltrimethylammonium bromide Pt-C14TAB nanoparticles: Structure and Stability  

Science Conference Proceedings (OSTI)

The vibrational spectra of platinum nanoparticles (12 nm) capped with tetradecyltrimethylammonium bromide, C{sub 14}TAB, were investigated by Fourier transform infrared (FTIR) spectroscopy. We have shown that the thermal decay of Pt-C{sub 14}TAB nanoparticles in N{sub 2}, H{sub 2} and O{sub 2} atmospheres leads to the release of hydrocarbon chain of surfactant and the formation of strongly bonded layer of ammonium cations on the platinum surface. The platinum atoms accessible to CO chemisorptions were not reducible by hydrogen in the temperature ranging from 30 C to 200 C. A FTIR spectrum of C{sub 14}TAB adsorbed on Pt nanoparticles dramatically perturbed as compared with pure C{sub 14}TAB. New intense and broad bands centered at 1450 cm{sup -1} and 760 cm{sup -1} are making their appearance in Pt-C{sub 14}TAB. It may be speculated, that new bands are result of coupling between conducting electrons of Pt and molecular vibrations of adsorbed C{sub 14}TAB and as a consequence specific vibrational modes of ammonium cation transformed into electron-vibrational modes.

Borodko, Y.; Jones, L.; Frei, H.; Somorjai, G.

2009-01-09T23:59:59.000Z

36

Sedimentation stability and aging of aqueous dispersions of Laponite in the presence of cetyltrimethylammonium bromide  

E-Print Network (OSTI)

This work discusses the sedimentation stability and aging of aqueous suspension of Laponite in the presence of cetyltrimethylammonium bromide (CTAB). The concentration of Laponite was fixed at the constant level $C_l=2$ %wt, which corresponds to the threshold between equilibrium gel IG$_1$ and repulsive gel IG$_2$ phases. The concentration of CTAB $C_s$ was within 0-0.3 %wt. In the presence of CTAB the Laponite aqueous suspensions were unstable against sedimentation and they separated out into upper and bottom layers (U- and B-layers, respectively). The dynamic light scattering technique revealed that the addition of CTAB even at rather small concentration, $C_s=0.0164$ %wt ($0.03 CEC$), induced noticeable changes in the aging dynamics of U-layer, and it was explained by equilibration of CTAB molecules that were initially non-uniformly distributed between different Laponite particles. Accelerated stability analysis by means of analytical centrifugation with rotor speed ${\\omega}=500-4000$ rpm revealed three sedimentation regimes: continuous (I, $C_s0.2$ %wt). It was demonstrated that B-layer was "soft" in the zone-like regime. The increase of ${\\omega}$ resulted in its supplementary compressing and the collapse of "soft" sediment above certain critical centrifugal acceleration.

V. Savenko; L. Bulavin; M. Rawiso; M. Loginov; E. Vorobiev; N. I. Lebovka

2013-05-28T23:59:59.000Z

37

Methylal and Methylal-Diesel Blended Fuels from Use In Compression-Ignition Engines  

DOE Green Energy (OSTI)

Gas-to-liquids catalytic conversion technologies show promise for liberating stranded natural gas reserves and for achieving energy diversity worldwide. Some gas-to-liquids products are used as transportation fuels and as blendstocks for upgrading crude derived fuels. Methylal (CH{sub 3}-O-CH{sub 2}-O-CH{sub 3}) also known as dimethoxymethane or DMM, is a gas-to-liquid chemical that has been evaluated for use as a diesel fuel component. Methylal contains 42% oxygen by weight and is soluble in diesel fuel. The physical and chemical properties of neat methylal and for blends of methylal in conventional diesel fuel are presented. Methylal was found to be more volatile than diesel fuel, and special precautions for distribution and fuel tank storage are discussed. Steady state engine tests were also performed using an unmodified Cummins 85.9 turbocharged diesel engine to examine the effect of methylal blend concentration on performance and emissions. Substantial reductions of particulate matter emissions h ave been demonstrated 3r IO to 30% blends of methylal in diesel fuel. This research indicates that methylal may be an effective blendstock for diesel fuel provided design changes are made to vehicle fuel handling systems.

Keith D. Vertin; James M. Ohi; David W. Naegeli; Kenneth H. Childress; Gary P. Hagen; Chris I. McCarthy; Adelbert S. Cheng; Robert W. Dibble

1999-05-05T23:59:59.000Z

38

Martian Methyl Chloride. A lesson in uncertainty  

E-Print Network (OSTI)

The MSL Lander Curiosity has recently detected methyl halides coming from heated samples of Martian soil. This is reminiscent of similar findings in the Viking Lander spacecraft. In the 1970s a consensus developed quickly explaining the methyl halides as contamination originating from the spacecraft, and ignoring lines of evidence that the two compounds originated from Mars, and that they could not have originated from the proposed spacecraft chemistry. I discuss why this consensus developed from the understanding of biochemistry and geochemistry of 1976, despite its implausibility. Subsequent explanations for the Viking methyl halides are more plausible but still not proven. The Curiosity rover results are also being explained as a result of on-spacecraft chemistry. I urge caution in this interpretation, in light of the historical Viking example: it is better to leave unexplained data unexplained than to lock in an explanation that precludes future developments.

Bains, William

2013-01-01T23:59:59.000Z

39

Association Behavior of Poly (methyl methacrylate-b-methacrylic acid-b-methyl methacrylate) in Aqueous Medium  

E-Print Network (OSTI)

ABA type tri-block amphiphilic polyelectrolyte consisting of poly(methyl methacrylate-block-methacrylic acid-block-methyl methacrylate) (P(MMA-b-MAA-b-MMA)) was synthesized by atom transfer radical polymerization technique ...

Yao, Jia

40

An Experimental and Kinetic Modeling Study of Methyl Decanoate Combustion  

DOE Green Energy (OSTI)

Biodiesel is a mixture of long chain fatty acid methyl esters derived from fats and oils. This research study presents opposed-flow diffusion flame data for one large fatty acid methyl ester, methyl decanoate, and uses the experiments to validate an improved skeletal mechanism consisting of 648 species and 2998 reactions. The results indicate that methyl decanoate is consumed via abstraction of hydrogen atoms to produce fuel radicals, which lead to the production of alkenes. The ester moiety in methyl decanoate leads to the formation of low molecular weight oxygenated compounds such as carbon monoxide, formaldehyde, and ketene.

Sarathy, S M; Thomson, M J; Pitz, W J; Lu, T

2009-12-04T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

Oxidation and methylation of dissolved elemental mercury by anaerobic bacteria  

Science Conference Proceedings (OSTI)

Methylmercury is a neurotoxin that poses significant health risks to humans. Some anaerobic sulphate- and iron-reducing bacteria can methylate oxidized forms of mercury, generating methylmercury1-4. One strain of sulphate-reducing bacteria (Desulfovibrio desulfuricans ND132) can also methylate elemental mercury5. The prevalence of this trait among different bacterial strains and species remains unclear, however. Here, we compare the ability of two strains of the sulphate-reducing bacterium Desulfovibrio and one strain of the iron-reducing bacterium Geobacter to oxidise and methylate elemental mercury in a series of laboratory incubations. Experiments were carried out under dark, anaerobic conditions, in the presence of environmentally-relevant concentrations of elemental mercury. We report differences in the ability of these organisms to oxidise and methylate elemental mercury. In line with recent findings5, we show that Desulfovibrio desulfuricans ND132 can both oxidise and methylate elemental mercury. However, the rate of methylation of elemental mercury is only about one third the rate of methylation of oxidized mercury. We also show that Desulfovibrio alaskensis G20 can oxidise, but not methylate, elemental mercury. Geobacter sulfurreducens PCA is able to oxidise and methylate elemental mercury in the presence of cysteine. We suggest that the activity of methylating and non-methylating bacteria may together enhance the formation of methylmercury in anaerobic environments.

Hu, Haiyan [ORNL] [ORNL; Lin, Hui [ORNL] [ORNL; Zheng, Wang [ORNL] [ORNL; Tomanicek, Stephen J [ORNL] [ORNL; Johs, Alexander [ORNL] [ORNL; Feng, Xinbin [ORNL] [ORNL; Elias, Dwayne A [ORNL] [ORNL; Liang, Liyuan [ORNL] [ORNL; Liang, Liyuan [ORNL] [ORNL; Gu, Baohua [ORNL] [ORNL

2013-01-01T23:59:59.000Z

42

Structural Basis for Methyl Transfer by a Radical SAM Enzyme  

SciTech Connect

The radical S-adenosyl-l-methionine (SAM) enzymes RlmN and Cfr methylate 23S ribosomal RNA, modifying the C2 or C8 position of adenosine 2503. The methyl groups are installed by a two-step sequence involving initial methylation of a conserved Cys residue (RlmN Cys{sup 355}) by SAM. Methyl transfer to the substrate requires reductive cleavage of a second equivalent of SAM. Crystal structures of RlmN and RlmN with SAM show that a single molecule of SAM coordinates the [4Fe-4S] cluster. Residue Cys{sup 355} is S-methylated and located proximal to the SAM methyl group, suggesting the SAM that is involved in the initial methyl transfer binds at the same site. Thus, RlmN accomplishes its complex reaction with structural economy, harnessing the two most important reactivities of SAM within a single site.

Boal, Amie K.; Grove, Tyler L.; McLaughlin, Monica I.; Yennawar, Neela H.; Booker, Squire J.; Rosenzweig, Amy C. (NWU); (Penn)

2011-09-16T23:59:59.000Z

43

An Experimental and Kinetic Modeling Study of Methyl Decanoate Combustion  

DOE Green Energy (OSTI)

Biodiesel is typically a mixture of long chain fatty acid methyl esters for use in compression ignition engines. Improving biofuel engine performance requires understanding its fundamental combustion properties and the pathways of combustion. This research study presents new combustion data for methyl decanoate in an opposed-flow diffusion flame. An improved detailed chemical kinetic model for methyl decanoate combustion is developed, which serves as the basis for deriving a skeletal mechanism via the direct relation graph method. The novel skeletal mechanism consists of 648 species and 2998 reactions. This mechanism well predicts the methyl decanoate opposed-flow diffusion flame data. The results from the flame simulations indicate that methyl decanoate is consumed via abstraction of hydrogen atoms to produce fuel radicals, which lead to the production of alkenes. The ester moiety in methyl decanoate leads to the formation of low molecular weight oxygenated compounds such as carbon monoxide, formaldehyde, and ketene.

Sarathy, S M; Thomson, M J; Pitz, W J; Lu, T

2010-02-19T23:59:59.000Z

44

Initial test results from the RedFlow 5 kW, 10 kWh zinc-bromide module, phase 1.  

DOE Green Energy (OSTI)

In this paper the performance results of the RedFlow zinc-bromide module (ZBM) Gen 2.0 are reported for Phase 1 of testing, which includes initial characterization of the module. This included physical measurement, efficiency as a function of charge and discharge rates, efficiency as a function of maximum charge capacity, duration of maximum power supplied, and limited cycling with skipped strip cycles. The goal of this first phase of testing was to verify manufacturer specifications of the zinc-bromide flow battery. Initial characterization tests have shown that the ZBM meets the manufacturer's specifications. Further testing, including testing as a function of temperature and life cycle testing, will be carried out during Phase 2 of the testing, and these results will be issued in the final report, after Phase 2 testing has concluded.

Ferreira, Summer Rhodes; Rose, David Martin

2012-02-01T23:59:59.000Z

45

Structural Analysis of a Ni-Methyl Species in Methyl-Coenzyme M Reductase from Methanothermobacter marburgensis  

SciTech Connect

We present the 1.2 {angstrom} resolution X-ray crystal structure of a Ni-methyl species that is a proposed catalytic intermediate in methyl-coenzyme M reductase (MCR), the enzyme that catalyzes the biological formation of methane. The methyl group is situated 2.1 {angstrom} proximal of the Ni atom of the MCR coenzyme F{sub 430}. A rearrangement of the substrate channel has been posited to bring together substrate species, but Ni(III)-methyl formation alone does not lead to any observable structural changes in the channel.

Cedervall, Peder E.; Dey, Mishtu; Li, Xianghui; Sarangi, Ritimukta; Hedman, Britt; Ragsdale, Stephen W.; Wilmot, Carrie M. (Michigan); (SLAC); (UMM)

2012-02-15T23:59:59.000Z

46

Absorption spectrophotometric characterization of Sm(II), Sm(III), and Sm(II/III) bromides and Sm(III) oxybromide in the solid state  

DOE Green Energy (OSTI)

Absorption spectra obtained from SmBr/sub 3/, SmBr/sub 2/, and Sm0Br were used in identifying the samarium species in several mixed-valence Sm(II/III) compounds produced by H/sub 2/ reduction of SmBr/sub 3/. The nature of the absorption of Sm0Br made it possible to detect even traces of Sm0Br in the Sm bromides.

Wood, A.B.; Young, J.P.; Peterson, J.R.; Haschke, J.M.

1981-06-15T23:59:59.000Z

47

Production of methyl-vinyl ketone from levulinic acid  

DOE Patents (OSTI)

A method for converting levulinic acid to methyl vinyl ketone is described. The method includes the steps of reacting an aqueous solution of levulinic acid, over an acid catalyst, at a temperature of from room temperature to about 1100 K. Methyl vinyl ketone is thereby formed.

Dumesic, James A. (Verona, WI); West; Ryan M. (Madison, WI)

2011-06-14T23:59:59.000Z

48

EA-1157: Methyl Chloride via Oxyhydrochlorination of Methane: A Building  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

57: Methyl Chloride via Oxyhydrochlorination of Methane: A 57: Methyl Chloride via Oxyhydrochlorination of Methane: A Building Black for Chemicals and Fuels from Natural Gas, Carrollton, Kentucky EA-1157: Methyl Chloride via Oxyhydrochlorination of Methane: A Building Black for Chemicals and Fuels from Natural Gas, Carrollton, Kentucky SUMMARY This EA evaluates the environmental impacts for the proposal to advance Oxyhydrochlorination technology to an integrated engineering-scale process. PUBLIC COMMENT OPPORTUNITIES None available at this time. DOCUMENTS AVAILABLE FOR DOWNLOAD September 27, 1996 EA-1157: Finding of No Significant Impact Methyl Chloride via Oxyhydrochlorination of Methane: A Building Black for Chemicals and Fuels from Natural Gas September 27, 1996 EA-1157: Final Environmental Assessment Methyl Chloride via Oxyhydrochlorination of Methane: A Building Black for

49

Lithium Methyl Carbonate as a Reaction Product of Metallic Lithium and Dimethyl Carbonate  

E-Print Network (OSTI)

of chemically synthesized lithium methylcarbonate (CH 3 OCOmolecular structures of lithium methyl carbonate (CH 3 OCO 2FTIR study also suggests that lithium methyl carbonate has

Zhuang, Guorong V.; Yang, Hui; Ross Jr., Philip N.; Xu, Kang; Jow, T. Richard

2005-01-01T23:59:59.000Z

50

High-throughput sequencing of cytosine methylation in plant DNA  

E-Print Network (OSTI)

to that in flowering plants around repeat regions [15]. The green algae Chlorella sp. NC64A and Volvox carteri show very little methylation in non-CpG contexts in genes, and greatly reduced or absent non-CpG methylation at repetitive regions, with Volvox carteri... showing greatly reduced methylation in all contexts compared to other plant species [15]. Similarly, the distributions of methyla- tion in the green algae Chlamydomonas, while not wholly divergent from those in flowering plants [49], show much lower levels...

Hardcastle, Thomas J

2013-06-07T23:59:59.000Z

51

Sorghum genome sequencing by methylation filtration  

E-Print Network (OSTI)

Sorghum bicolor is a close relative of maize and is a staple crop in Africa and much of the developing world because of its superior tolerance of arid growth conditions. We have generated sequence from the hypomethylated portion of the sorghum genome by applying methylation filtration (MF) technology. The evidence suggests that 96 % of the genes have been sequence tagged, with an average coverage of 65 % across their length. Remarkably, this level of gene discovery was accomplished after generating a raw coverage of less than 300 megabases of the 735-megabase genome. MF preferentially captures exons and introns, promoters, microRNAs, and simple sequence repeats, and minimizes interspersed repeats, thus providing a robust view of the functional parts of the genome. The sorghum MF sequence set is beneficial to research on sorghum and is also a powerful resource for comparative genomics among the grasses and across the entire plant kingdom. Thousands of hypothetical gene predictions in rice and Arabidopsis are supported by the sorghum dataset, and genomic similarities highlight evolutionarily conserved regions that will lead to a better understanding of rice and Arabidopsis.

Joseph A. Bedell; Muhammad A. Budiman; Andrew Nunberg; Robert W. Citek; Dan Robbins; Joshua Jones; Elizabeth Flick; Theresa Rohlfing; Jason Fries; Kourtney Bradford; Jennifer Mcmenamy; Michael Smith; Heather Holeman; Bruce A. Roe; Graham Wiley; Ian F. Korf; Pablo D. Rabinowicz; Nathan Lakey; W. Richard Mccombie; Jeffrey A. Jeddeloh; Robert A. Martienssen

2005-01-01T23:59:59.000Z

52

Control of mercury methylation in wetlands through iron addition  

E-Print Network (OSTI)

Mason, R. P. ; Flegal, A. R. , Mercury speciation in the SanP. ; Flegal, A. R. , Decadal mercury trends in San FranciscoP. G. ; Nelson, D. C. , Mercury methylation from unexpected

Sedlak, David L; Ulrich, Patrick D

2009-01-01T23:59:59.000Z

53

[Characterization of historical infiltration in the unsaturated zone at the Nevada Test Site using chloride, bromide, and chlorine-36 as environmental tracers]; [Final subcontract report  

SciTech Connect

This document is an end-of-contract report, prepared by Hydro Geo Chem for Los Alamos National Laboratory under contract number 9-XDD-6329F-1. The ultimate goal of this work is to characterize historical infiltration and unsaturated flow in the Yucca Mountain area of the Nevada Test Site. Work on this contract has focused on using chloride, bromide, stable chlorine isotopes, and chlorine-36 distributions to evaluate the depth of infiltration in the unsaturated zone. Effort in support of this work has included developing analytical procedures, exploring ways in which to separate the. meteoric component from the rock component, and meeting quality assurance requirements.

NONE

1991-05-17T23:59:59.000Z

54

The comparison of sulfide CoMo/?-Al2O3 and NiMo/?-Al2O3 catalysts in methyl palmitate and methyl heptanoate hydrodeoxygenation  

Science Conference Proceedings (OSTI)

The hydrodeoxygenation of methyl palmitate and methyl heptanoate as the model compounds of bio-oil in the presence of sulfided CoMo/?-Al2O3 and NiMo/?-Al2O3 catalysts was studied at the temperature ... Keywords: CoMoS/?-Al2O3, NiMoS/?-Al2O3, biofuels, hydrodeoxygenation, methyl heptanoate, methyl palmitate

Irina V. Deliy; Evgenia N. Vlasova; Alexey L. Nuzhdin; Galina A. Bukhtiyarova

2011-12-01T23:59:59.000Z

55

Nested methylation-specific polymerase chain reaction cancer detection method  

DOE Patents (OSTI)

A molecular marker-based method for monitoring and detecting cancer in humans. Aberrant methylation of gene promoters is a marker for cancer risk in humans. A two-stage, or "nested" polymerase chain reaction method is disclosed for detecting methylated DNA sequences at sufficiently high levels of sensitivity to permit cancer screening in biological fluid samples, such as sputum, obtained non-invasively. The method is for detecting the aberrant methylation of the p16 gene, O 6-methylguanine-DNA methyltransferase gene, Death-associated protein kinase gene, RAS-associated family 1 gene, or other gene promoters. The method offers a potentially powerful approach to population-based screening for the detection of lung and other cancers.

Belinsky, Steven A. (Albuquerque, NM); Palmisano, William A. (Edgewood, NM)

2007-05-08T23:59:59.000Z

56

Methods for detection of methyl-CpG dinucleotides  

DOE Patents (OSTI)

The invention provides methods for enriching methyl-CpG sequences from a DNA sample. The method makes use of conversion of cytosine residues to uracil under conditions in which methyl-cytosine residues are preserved. Additional methods of the invention enable to preservation of the context of me-CpG dinucleotides. The invention also provides a recombinant, full length and substantially pure McrA protein (rMcrA) for binding and isolation of DNA fragments containing the sequence 5'-C.sup.MeCpGG-3'. Methods for making and using the rMcrA protein, and derivatives thereof are provided.

Dunn, John J.

2012-09-11T23:59:59.000Z

57

Methods for detection of methyl-CpG dinucleotides  

DOE Patents (OSTI)

The invention provides methods for enriching methyl-CpG sequences from a DNA sample. The method makes use of conversion of cytosine residues to uracil under conditions in which methyl-cytosine residues are preserved. Additional methods of the invention enable to preservation of the context of me-CpG dinucleotides. The invention also provides a recombinant, full length and substantially pure McrA protein (rMcrA) for binding and isolation of DNA fragments containing the sequence 5'-C.sup.MeCpGG-3'. Methods for making and using the rMcrA protein, and derivatives thereof are provided.

Dunn, John J.

2013-01-29T23:59:59.000Z

58

Contribution of Iron-Reducing Bacteria to Mercury Methylation in Marine Sediments  

E-Print Network (OSTI)

AND R. P. MASON. 2006. Mercury methylation by dissimilatoryPRUCHA, AND G. MIERLE. 1991. Mercury methylation by sulfate-AND J. M. SIEBURTH. 1993. Mercury biogeochemical cycling in

Fleming, Emily J.; Nelson, D C

2006-01-01T23:59:59.000Z

59

Network-based classification of recurrent endometrial cancers using high-throughput DNA methylation data  

Science Conference Proceedings (OSTI)

DNA methylation, a well-studied mechanism of epigenetic regulation, plays important roles in cancer. Increased levels of global DNA methylation is observed in primary solid tumors including endometrial carcinomas and is generally associated with silencing ... Keywords: DNA methylation, Steiner tree, cancer recurrence, classification, protein-protein interaction network, random walk

Jianhua Ruan; Md. Jamiul Jahid; Fei Gu; Chengwei Lei; Yi-Wen Huang; Ya-Ting Hsu; David G. Mutch; Chun-Liang Chen; Nameer B. Kirma; Tim H. Huang

2012-10-01T23:59:59.000Z

60

Global methylation responses to low dose radiation exposure  

NLE Websites -- All DOE Office Websites (Extended Search)

methylation responses to low dose radiation exposure methylation responses to low dose radiation exposure Pamela J Sykes, Michelle R Newman, Benjamin J Blyth and Rebecca J Ormsby Haematology and Genetic Pathology, Flinders University and Medical Centre, Flinders Centre for Cancer Prevention and Control, Bedford Park, Adelaide, South Australia 5042 Australia. (pam.sykes@flinders.edu.au). Our goal is to study the mechanisms involved in biological responses to low doses of radiation in vivo in the dose range that is relevant to population and occupational exposures. At high radiation doses, DNA double-strand breaks are considered the critical lesion underlying the initiation of radiation-induced carcinogenesis. However, at the very low radiation doses relevant for the general public, the induction of DNA double-strand breaks

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

SYNTHESIS OF METHYL METHACRYLATE FROM COAL-DERIVED SYNGAS  

DOE Green Energy (OSTI)

Research Triangle Institute (RTI), Eastman Chemical Company, and Bechtel collectively are developing a novel three-step process for the synthesis of methyl methacrylate (MMA) from coal-derived syngas that consists of the steps of synthesis of a propionate, its condensation with formaldehyde to form methacrylic acid (MAA), and esterification of MAA with methanol to produce MMA. The research team has completed the research on the three-step methanol-based route to MMA. Under an extension to the original contract, we are currently evaluating a new DME-based process for MMA. The key research need for DME route is to develop catalysts for DME partial oxidation reactions and DME condensation reactions. Over the last quarter (January-March/99), in-situ formaldehyde generation and condensation with methyl propionate were tested over various catalysts and reaction conditions. The patent application is in preparation and the results are retained for future reports.

Makarand R. Gogate; James J. Spivey; Joseph R. Zoeller; Richard D. Colberg; Gerald N. Choi; Samuel S. Tam

1999-04-21T23:59:59.000Z

62

"Seeing" Mercury Methylation in Progress  

NLE Websites -- All DOE Office Websites (Extended Search)

Mercury in the environment can easily reach toxic levels. In a process called methylation, Hg is transformed into a form that can be accumulated in the muscle and fatty tissue of fish. Accumulated levels of methylmercury become higher as the fish grow, and levels are magnified up the food web as larger fish eat smaller fish, a process called biomagnification. As a result, mercury concentrations in fish can be millions of times higher than in surrounding waters [1]. Fish advisories have been set to limit consumption of certain fish higher up on the food web, especially for pregnant women and small children (see Figure 1). Mercury in the environment can easily reach toxic levels. In a process called methylation, Hg is transformed into a form that can be accumulated in the muscle and fatty tissue of fish. Accumulated levels of methylmercury become higher as the fish grow, and levels are magnified up the food web as larger fish eat smaller fish, a process called biomagnification. As a result, mercury concentrations in fish can be millions of times higher than in surrounding waters [1]. Fish advisories have been set to limit consumption of certain fish higher up on the food web, especially for pregnant women and small children (see Figure 1). figure 1 Figure 1. Mercury health risks Health advisory from the CALFED Science Program to limit consumption of fish, in order to avoid excessive accumulation of Hg. Methylated Hg is biomagnified up the food chain, attaining high levels in some types of sportfish. http://science.calwater.ca.gov/images/scinews_hg_da_lg.jpg

63

Nonradiometric and radiometric testing of radioiodine sorbents using methyl iodide  

SciTech Connect

A nonradiometric test of adsorbents and adsorbers with normal methyl iodide (CH/sub 3//sup 127/I) is desirable. Use of methyl radioiodide (CH/sub 3//sup 131/I) requires special precautions and facilities and results in bed contamination. However, first it must be established to what extent the removal of CH/sub 3//sup 127/I by adsorbents is indicative of the removal of CH/sub 3//sup 131/I. An experimental apparatus was built and used to simultaneously measure the penetrations of CH/sub 3/I molecules and the radioisotope in CH/sub 3//sup 131/I through charcoal absorbent beds. Gas chromatography with electron capture detection was used to measure CH/sub 3/I. Radioiodine was measured using charcoal traps within NaI scintillation well crystals. Real time (5-min interval) radioiodine measurement provided immediate penetration results directly comparable to the real time penetrations of methyl iodide. These penetrations were compared for typical charcoal adsorbents with these impregnants: (a) 5% KI/sub 3/, (b) 5% KI/sub 3/ + 2% TEDA, (c) 5% TEDA, and (d) metal salts (Whetlerite). Differences between CH/sub 3/I and CH/sub 3//sup 131/I penetrations observed for the two iodized charcoals were attributed to isotope exchange reactions. Equivalent penetrations were observed for non-iodized adsorbents and for iodized ones at initial time. First order rates were confirmed for reactions with TEDA and for isotope exchange. This was one more confirmation of the lack of a challenge concentration effect on efficiencies at low test bed loadings. In addition to other removal mechanisms, reversible physical adsorption was observed with all charcoals.

Wood, G.O.; Valdez, F.O.

1980-01-01T23:59:59.000Z

64

Durability of Poly (Methyl Methacrylate) Lenses Used in Concentrating Photovoltaics (Presentation)  

DOE Green Energy (OSTI)

This presentation reports the findings of NREL's screen test to characterize the durability of poly (methyl methacrylate) lenses used in concentrated photovoltaics.

Miller, D.; Gedvilas, L.; To, B.; Kennedy, C.; Kurtz, S.

2010-10-21T23:59:59.000Z

65

DISCOVERY OF METHYL ACETATE AND GAUCHE ETHYL FORMATE IN ORION  

SciTech Connect

We report on the discovery of methyl acetate, CH{sub 3}COOCH{sub 3}, through the detection of a large number of rotational lines from each one of the spin states of the molecule: AA species (A{sub 1} or A{sub 2}), EA species (E{sub 1}), AE species (E{sub 2}), and EE species (E{sub 3} or E{sub 4}). We also report, for the first time in space, the detection of the gauche conformer of ethyl formate, CH{sub 3}CH{sub 2}OCOH, in the same source. The trans conformer is also detected for the first time outside the Galactic center source SgrB2. From the derived velocity of the emission of methyl acetate, we conclude that it arises mainly from the compact ridge region with a total column density of (4.2 {+-} 0.5) Multiplication-Sign 10{sup 15} cm{sup -2}. The derived rotational temperature is 150 K. The column density for each conformer of ethyl formate, trans and gauche, is (4.5 {+-} 1.0) Multiplication-Sign 10{sup 14} cm{sup -2}. Their abundance ratio indicates a kinetic temperature of 135 K for the emitting gas and suggests that gas-phase reactions could participate efficiently in the formation of both conformers in addition to cold ice mantle reactions on the surface of dust grains.

Tercero, B.; Cernicharo, J.; Lopez, A.; Caro, G. M. Munoz [Department of Astrophysics, CAB, INTA-CSIC, Crta Torrejon-Ajalvir, km. 4, E-28850 Torrejon de Ardoz, Madrid (Spain); Kleiner, I.; Nguyen, H. V. L., E-mail: terceromb@cab.inta-csic.es, E-mail: jcernicharo@cab.inta-csic.es, E-mail: lopezja@cab.inta-csic.es, E-mail: munozcg@cab.inta-csic.es, E-mail: isabelle.kleiner@lisa.u-pec.fr, E-mail: nguyen@pc.rwth-aachen.de [Laboratoire Interuniversitaire des Systemes Atmospheriques, CNRS/IPSL UMR7583 et Universites Paris Diderot et Paris Est, 61 av. General de Gaulle, F-94010 Creteil (France)

2013-06-10T23:59:59.000Z

66

Chemotactic antifouling properties of methyl caproate: its implication for ship hull coatings  

Science Conference Proceedings (OSTI)

Antifouling (AF) activity of methyl caproate was evaluated by using both laboratory assays and field investigations. It showed strong repellent activity against common fouling organisms (marine bacteria (Shewanella oneidensis, Roseobacter gallaeciensis ... Keywords: Ulva pertusa, antifouling, chemotaxis, fouling resistance, hybrid CDP, marine bacteria, methyl caproate, zinc pyrithione

Haridatta Bhatta Rai; Sang Mok Jung; M. Sidharthan; Ji Hyun Lee; Chi Young Lim; Young-Kyu Kang; Chang Yeon; N. S. Park; H. W. Shin

2006-08-01T23:59:59.000Z

67

US Food and Drug Administration survey of methyl mercury in canned tuna  

SciTech Connect

Methyl mercury was determined by the US Food and Drug Administration (FDA) in 220 samples of canned tuna collected in 1991. Samples were chosen to represent different styles, colors, and packs as available. Emphasis was placed on water-packed tuna, small can size, and the highest-volume brand names. The average methyl mercury (expressed as Hg) found for the 220 samples was 0.17 ppm; the range was <0.10-0.75 ppm. Statistically, a significantly higher level of methyl mercury was found in solid white and chunk tuna. Methyl mercury level was not related to can size. None of the 220 samples had methyl mercury levels that exceeded the 1 ppm FDA action level. 11 refs., 1 tab.

Yess, J. [Food and Drug Administration, Washington, DC (United States)

1993-01-01T23:59:59.000Z

68

High Temperature Chemical Kinetic Combustion Modeling of Lightly Methylated Alkanes  

DOE Green Energy (OSTI)

Conventional petroleum jet and diesel fuels, as well as alternative Fischer-Tropsch (FT) fuels and hydrotreated renewable jet (HRJ) fuels, contain high molecular weight lightly branched alkanes (i.e., methylalkanes) and straight chain alkanes (n-alkanes). Improving the combustion of these fuels in practical applications requires a fundamental understanding of large hydrocarbon combustion chemistry. This research project presents a detailed high temperature chemical kinetic mechanism for n-octane and three lightly branched isomers octane (i.e., 2-methylheptane, 3-methylheptane, and 2,5-dimethylhexane). The model is validated against experimental data from a variety of fundamental combustion devices. This new model is used to show how the location and number of methyl branches affects fuel reactivity including laminar flame speed and species formation.

Sarathy, S M; Westbrook, C K; Pitz, W J; Mehl, M

2011-03-01T23:59:59.000Z

69

Anti-inflammatory and antifibrotic effects of methyl palmitate  

Science Conference Proceedings (OSTI)

Methyl palmitate (MP) has been shown earlier to inhibit Kupffer cells and rat peritoneal macrophages. To evaluate the potential of MP to inhibit the activation of other macrophages, RAW cells (macrophages of alveolar origin) were treated with varying concentrations of MP (0.25, 0.5, 1 mM). Assessment of cytotoxicity using MTT assay revealed that 0.25 and 0.5 mM are not toxic to RAW cells. MP was able to inhibit the phagocytic function of RAW cells. Treatment of cells with MP 24 hours prior to LPS stimulation significantly decreased nitric oxide release and altered the pattern of cytokines release; there was a significant decrease in TNF-{alpha} and a significant increase in IL-10 compared to the controls. However, there is a non-significant change in IL-6 level. Furthermore, phosphorylation of inhibitory kappa B (I{kappa}B{alpha}) protein was significantly decreased in RAW cells treated with 0.5 mM MP after LPS stimulation. Based upon the in-vitro results, it was examined whether MP treatment will be effective in preventing bleomycin-induced lung inflammation and fibrosis in-vivo. Bleomycin given by itself caused destruction of the lung architecture characterized by pulmonary fibrosis with collapse of air alveoli and emphysematous. Bleomycin induced a significant increase in hydroxyproline level and activated NF-{kappa}B, p65 expression in the lung. MP co-treatment significantly ameliorated bleomycin effects. These results suggest that MP has a potential of inhibiting macrophages in general. The present study demonstrated for the first time that MP has anti-inflammatory and antifibrotic effect that could be through NF-kB inhibition. Thus MP like molecule could be a promising anti-inflammatory and antifibrotic drug. - Research Highlights: >Methyl palmitate is a universal macrophage inhibitor. >It could be a promising nucleus of anti-inflammatory and antifibrotic drugs. >The underlying mechanism of these effects could be through NF-kB inhibition.

El-Demerdash, Ebtehal, E-mail: ebtehal_dm@yahoo.com

2011-08-01T23:59:59.000Z

70

Novel syngas-based process for methyl methacrylate  

SciTech Connect

Research Triangle Institute (RTI), Eastman Chemical Company, and Bechtel are developing a novel process for synthesis of methyl methacrylate (MMA) from coal-derived syngas, under a contract from the U.S. Department of Energy, Pittsburgh Energy Technology Center. This three-step process consists of synthesis of a propionate, its condensation with formaldehyde, and esterification of resulting methacrylic acid (MAA) with methanol to produce MMA. Eastman has focused on the research on propionate synthesis step. The resultant Mo catalysts work efficiently at much less severe conditions (170{degrees}C and 30 atm) than the conventional Ni catalysts (270{degrees}C and 180 atm). Bechtel has performed an extensive cost analysis, which shows that Eastman`s propionate synthesis process is competitive with other technologies to produce the anhydride. In the second step, RTI and Eastman have developed active and stable V-SI-P and Ta metal oxide catalysts for condensation reactions of propionates with formaldehyde. RTI has demonstrated a novel correlation among the catalyst acid-base properties, condensation reaction yield, and long-term catalyst activity. Current research focuses on enhancing the condensation reaction yields, acid-base properties, in situ condensation in a high- temperature, high-pressure (HTHP) slurry reactor, and alternate formaldehyde feedstocks. Based on Eastman and RTI laboratory reactor operating data, a cost estimate is also being developed for the integrated process.

Gogate, M.R.; Spivey, J.J. [Research Triangle Institute, Research Triangle Park, NC (United States); Zoeller, J.R. [Eastman Chemical Co., Kingsport, TN (United States); Choi, G.N. [Bechtel, Inc., San Francisco, CA (United States); Tam, S.S. [Bechtel, Inc., Houston, TX (United States); Tischer, R.E. [USDOE Pittsburgh Energy Technology Center, PA (United States); Srivastava, R.D. [Burns and Roe Services Corp., Pittsburgh, PA (United States)

1996-12-31T23:59:59.000Z

71

Synthesis of Methyl Methacrylate from Coal-Derived Syngas  

Science Conference Proceedings (OSTI)

Research Triangle Institute (RTI), Eastman Chemical Company, and Bechtel collectively are developing a novel three-step process for the synthesis of methyl methacrylate (MMA) from coal-derived syngas that consists of the steps of synthesis of a propionate, its condensation with formaldehyde to form methacrylic acid (MAA), and esterification of MAA with methanol to produce MMA. RTI has completed the research on the three-step methanol-based route to MMA. Under an extension to the original contract, RTI is currently evaluating a new DME-based process for MMA. The key research need for DME route is to develop catalysts for DME partial oxidation reactions and DME condensation reactions. Over the last month, RTI has finalized the design of a fixed-bed microreactor system for DME partial oxidation reactions. RTI incorporated some design changes to the feed blending system, so as to be able to blend varying proportions of DME and oxygen. RTI has also examined the flammability limits of DME-air mixtures. Since the lower flammability limit of DME in air is 3.6 volume percent, RTI will use a nominal feed composition of 1.6 percent in air, which is less than half the lower explosion limit for DME-air mixtures. This nominal feed composition is thus considered operationally safe, for DME partial oxidation reactions. RTI is also currently developing an analytical system for DME partial oxidation reaction system.

Gerald N. Choi; James J. Spivey; Jospeh R. Zoeller; Makarand R. Gogate; Richard D. Colberg; Samuel S. Tam

1998-04-17T23:59:59.000Z

72

Dispersion Morphology of Poly(methyl acrylate)/Silica Nanocomposites  

SciTech Connect

Nearly monodisperse poly(methyl acrylate) (PMA) and spherical SiO{sub 2} nanoparticles (NP, d = 14 {+-} 4 nm) were co-cast from 2-butanone, a mutually good solvent and a displacer of adsorbed PMA from silica. The effects of NP content and post-casting sample history on the dispersion morphology were found by small-angle X-ray scattering supplemented by transmission electron microscopy. Analysis of the X-ray results show that cast and thermally annealed samples exhibited a nearly random particle dispersion. That the same samples, prior to annealing, were not well-dispersed is indicative of thermodynamic miscibility during thermal annealing over the range of NP loadings studied. A simple mean-field thermodynamic model suggests that miscibility results primarily from favorable polymer segment/NP surface interactions. The model also indicates, and experiments confirm, that subsequent exposure of the composites to the likely displacer ethyl acetate results in entropic destabilization and demixing into NP-rich and NP-lean phases.

D Janes; J Moll; S Harton; C Durning

2011-12-31T23:59:59.000Z

73

Thermomechanical properties of polyhedral oligomeric silsequioxane- poly(methyl methacrylate) nanocomposites  

E-Print Network (OSTI)

Poly(methyl methacrylate)s (PMMA) containing polyhedral oligomeric silsesquioxane (POSS) nanoparticles (d [approx.] 1.5 nm) were subjected to heological, mechanical, and morphological tests to determine the effects that ...

Kopesky, Edward Thomas

2005-01-01T23:59:59.000Z

74

Dissolution and swelling of bituminous coal in n-methyl-pyrrolidone.  

E-Print Network (OSTI)

??Research detailed herein examined the extraction and swelling of a bituminous coal in the super solvent n-methyl-pyrrolidone. Correlations were developed to describe the extraction and… (more)

Stoffa, Joseph M.

2006-01-01T23:59:59.000Z

75

Halogenated 1'-methyl-1,2'-bipyrroles (MBPs) in the Norwestern Atlantic  

E-Print Network (OSTI)

Halogenated 1'-methyl-1,2'-bipyrroles (MBPs) are a distinctive class of marine organic compounds. They are naturally produced, they have a unique carbon structure, they are highly halogenated, and they bioaccumulate in ...

Pangallo, Kristin C

2009-01-01T23:59:59.000Z

76

A unique regulatory phase of DNA methylation in the early mammalian embryo  

E-Print Network (OSTI)

DNA methylation is highly dynamic during mammalian embryogenesis. It is broadly accepted that the paternal genome is actively depleted of 5-methylcytosine at fertilization, followed by passive loss that reaches a minimum ...

Chan, Michelle M.

77

Experimental and Kinetic Modeling Study of Extinction and Ignition of Methyl Decanoate in Laminar Nonpremixed Flows  

DOE Green Energy (OSTI)

Methyl decanoate is a large methyl ester that can be used as a surrogate for biodiesel. In this experimental and computational study, the combustion of methyl decanoate is investigated in nonpremixed, nonuniform flows. Experiments are performed employing the counterflow configuration with a fuel stream made up of vaporized methyl decanoate and nitrogen, and an oxidizer stream of air. The mass fraction of fuel in the fuel stream is measured as a function of the strain rate at extinction, and critical conditions of ignition are measured in terms of the temperature of the oxidizer stream as a function of the strain rate. It is not possible to use a fully detailed mechanism for methyl decanoate to simulate the counterflow flames because the number of species and reactions is too large to employ with current flame codes and computer resources. Therefore a skeletal mechanism was deduced from a detailed mechanism of 8555 elementary reactions and 3036 species using 'directed relation graph' method. This skeletal mechanism has only 713 elementary reactions and 125 species. Critical conditions of ignition were calculated using this skeletal mechanism and are found to agree well with experimental data. The predicted strain rate at extinction is found to be lower than the measurements. In general, the methyl decanoate mechanism provides a realistic kinetic tool for simulation of biodiesel fuels.

Seshadri, K; Lu, T; Herbinet, O; Humer, S; Niemann, U; Pitz, W J; Law, C K

2008-01-09T23:59:59.000Z

78

Synthesis of Methyl Methacrylate From Coal-Derived Syngas  

SciTech Connect

Research Triangle Institute (RTI), Eastman Chemical Company, and Bechtel collectively are developing a novel three-step process for the synthesis of methyl methacrylate (MMA) from coal-derived syngas that consists of the steps of synthesis of a propionate, its condensation with formaldehyde to form methacrylic acid (MAA), and esterification of MAA with methanol to produce MMA. RTI has completed the research on the three-step methanol-based route to MMA. Under an extension to the original contract, RTI is currently evaluating a new DME-based process for MMA. The key research need for DME route is to develop catalysts for DME partial oxidation reactions and DME condensation reactions. Over the last quarter(April-June, 1998), RTI has modified the reactor system including a new preheater and new temperature settings for the preheater. Continuous condensation of formaldehyde with propionic acid were carried out over 10% Nb O /SiO at 300°C without 2 5 2 interruption. Five activity and four regeneration cycles have been completed without plugging or material balance problems. The results show that 10% Nb O /SiO deactivates slowly with time 2 5 2 but can be regenerated, at least four times, to 100% of its original activity with 2% O in nitrogen 2 at 400°C. The cycles continue with consistent 90-95% of carbon balance. The reaction is scheduled to complete with 6 activity cycles and 5 regenerations. Used catalysts will be analyzed with TGA and XPS to determine bulk and surface coke content and coke properties. RTI will start the investigation of effects of propionic acid/formaldehyde ratio on reaction activity and product selectivity over 20% Nb O /SiO catalysts.

Ben W.-L. Jang; Gerald N. Choi; James J. Spivey; Jospeh R. Zoeller; Richard D. Colberg; Samuel S. Tam

1998-07-27T23:59:59.000Z

79

SYNTHESIS OF METHYL METHACRYLATE FROM COAL-DERIVED SYNGAS  

DOE Green Energy (OSTI)

Research Triangle Institute (RTI), Eastman Chemical Company, and Bechtel collectively are developing a novel three-step process for the synthesis of methyl methacrylate (MMA) from coal-derived syngas that consists of the steps of synthesis of a propionate, its condensation with formaldehyde to form methacrylic acid (MAA), and esterification of MAA with methanol to produce MMA. RTI has completed the research on the three-step methanol-based route to MMA. Under an extension to the original contract, RTI is currently evaluating a new DME-based process for MMA. The key research need for DME route is to develop catalysts for DME partial oxidation reactions and DME condensation reactions. Over the last quarter (July-September, 1998), the project team has completed the continuous condensation of formaldehyde with propionic acid over 10% Nb{sub 2}O{sub 5}/SiO{sub 2} at 300 C. Six activity and five regeneration cycles have been completed. The results show that 10% Nb{sub 2}O{sub 5}/SiO{sub 2} deactivates slowly with time but can be regenerated to its original activity with 2% O{sub 2} in nitrogen over night at 400 C. We have investigated the effects of regeneration, propionic acid/formaldehyde ratio (PA/HCHO = 4.5/1 to 1.5/1) and reaction temperature(280-300 C) on reaction activity and product selectivity over 20% Nb{sub 2}O{sub 5}/SiO{sub 2} catalysts. The regeneration effect on 20% Nb{sub 2}O{sub 5}/SiO{sub 2} is similar to the effect on 10% Nb{sub 2}O{sub 5}/SiO{sub 2}. The regeneration can bring the deactivated catalyst to its original activity. However, the selectivity to MAA decreases with regeneration while the selectivity to DEK and CO{sub 2} increases. When PA/HCHO ratio is decreased from 4.5/1 to 2.25/1 then to 1.5/1 at 300 C the MAA yield decreases but the MAA selectivity first increases then decreases. Decreasing the reaction temperature from 300 C to 280 C decreases the MAA yield from 39.5% to 30.7% but increases the MAA selectivity from 73.7% to 82.2%. The results indicate that both temperature and PA/HCHO ratio are important parameters to optimize the economic of the condensation between propionic acid and formaldehyde.

BEN W.-L. JANG; GERALD N. CHOI; JAMES J. SPIVEY; JOSPEH R. ZOELLER; RICHARD D. COLBERG

1998-10-20T23:59:59.000Z

80

Geometric and Electronic Structures of the Ni(I) and Methyl-Ni(III)  

NLE Websites -- All DOE Office Websites (Extended Search)

9 9 Geometric and Electronic Structures of the Ni(I) and Methyl-Ni(III) Intermediates of Methyl-Coenzyme M Reductase Methyl-coenzyme M reductase (MCR) from methanogenic archaea catalyzes the terminal step in biological methane synthesis. Using coenzyme B (CoBSH) as the two-electron donor, MCR reduces methyl-coenzyme M (methyl-SCoM) to form methane and the heterodisulfide product, CoBS-SCoM. MCR contains an essential redox active nickel tetrapyrrolic cofactor called coenzyme F430 at its active site, which is active in the reduced Ni(I) state (MCRred1). All of the biologically generated methane, amounting to 1 billion tons per annum globally, is formed by MCR. Furthermore, recent evidence indicates that anaerobic methane oxidation is also catalyzed by MCR and occurs by a reversal of the methane synthesis reaction. Methane is a potent greenhouse gas, trapping 20 times more heat than CO2. In addition, methane is also an important and clean fuel as it produced the least amount of CO2 per unit of heat released. Thus, it is critically important to understand the mechanism of formation of the smallest hydrocarbon in nature.

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81

Role of Morphological Growth State and Gene Expression in Desulfovibrio africanus strain Walvis Bay Mercury Methylation  

Science Conference Proceedings (OSTI)

The biogeochemical transformations of mercury are a complex process, with the production of methylmercury, a potent human neurotoxin, repeatedly demonstrated in sulfate- and Fe(III)- reducing as well as methanogenic bacteria. However, little is known regarding the morphology, genes or proteins involved in methylmercury generation. Desulfovibrio africanus strain Walvis Bay is a Hg-methylating -proteobacterium with a sequenced genome and has unusual pleomorphic forms. In this study, a relationship between the pleomorphism and Hg methylation was investigated. Proportional increases in the sigmoidal (regular) cell form corresponded with increased net MeHg production, but decreased when the pinched cocci (persister) form became the major morphotype. D. africanus microarrays indicated that the ferrous iron transport genes (feoAB), as well as ribosomal genes and several genes whose products are predicted to have metal binding domains (CxxC), were up-regulated during exposure to Hg in the exponential phase. While no specific methylation pathways were identified, the finding that Hg may interfere with iron transport and the correlation of growth-phase dependent morphology with MeHg production are notable. The identification of these relationships between differential gene expression, morphology, and the growth phase dependence of Hg transformations suggests that actively growing cells are primarily responsible for methylation, and so areas with ample carbon and electron-acceptor concentrations may also generate a higher proportion of methylmercury than more oligotrophic environments. The observation of increased iron transporter expression also suggests that Hg methylation may interfere with iron biogeochemical cycles.

Moberly, James G [ORNL; Miller, Carrie L [ORNL; Brown, Steven D [ORNL; Biswas, Abir [ORNL; Brandt, Craig C [ORNL; Palumbo, Anthony Vito [ORNL; Elias, Dwayne A [ORNL

2012-01-01T23:59:59.000Z

82

Two poplar methyl salicylate esterases display comparable biochemical properties but divergent expression patterns  

NLE Websites -- All DOE Office Websites (Extended Search)

Two Two poplar methyl salicylate esterases display comparable biochemical properties but divergent expression patterns Nan Zhao a , Ju Guan a , Farhad Forouhar b , Timothy J. Tschaplinski c , Zong-Ming Cheng a , Liang Tong b , Feng Chen a, * a Department of Plant Sciences, University of Tennessee, 252 Ellington Plant Science Bldg., 2431 Joe Johnson Drive, Knoxville, TN 37996, USA b Department of Biological Sciences, Northeast Structural Genomics Consortium, Columbia University, New York, NY 10027, USA c Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA a r t i c l e i n f o Article history: Received 3 June 2008 Received in revised form 27 October 2008 Available online 10 January 2009 Keywords: Black cottonwood Populus trichocarpa Methyl esterase SABP2 Methyl salicylate Salicylic acid Gene family Molecular modeling a b s t r a c t Two genes encoding proteins

83

DOEEA-1157 ENVIRONlMENTAL ASSESSMENT METHYL CHLORIDE VIA OXYHYDROCHLOFUNATION OF METHANE:  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

57 57 ENVIRONlMENTAL ASSESSMENT METHYL CHLORIDE VIA OXYHYDROCHLOFUNATION OF METHANE: A BUILDING BLOCK FOR CHEMICALS AND FUELS FROM NATURAL GAS DOW CORNING CORPORATION CARROLLTON, KENTUCKY SEPTEMBER 1996 U.S. DEPARTMENT OF ENERGY PITTSBURGH ENERGY TECHNOLOGY CENTER CUM ~~~~~~~~ DOEEA-1157 ENVIRONlMENTAL ASSESSMENT METHYL CHLORIDE VIA OXYHYDROCHLORINATION OF METHANE: A BUILDING BLOCK FOR CHEMICALS AND FUELS FROM NATURAL GAS DOW CORNING CORPORATION CARROLLTON, KENTUCKY SEPTEMBER 1996 U.S. DEPARTMENT OF ENERGY PITTSBURGH ENERGY TECHNOLOGY CENTER Portions of this document may be illegible in electronic image products. Image are produced from the best available original document. &E/,Etq --,/s7 FINDING OF NO SIGNIFICANT IMPACT FOR THE PROPOSED METHYL CHLORIDE V

84

Methylation of the ATM promoter in glioma cells alters ionizing radiation sensitivity  

SciTech Connect

Glioblastomas are among the malignancies most resistant to radiation therapy. In contrast, cells lacking the ATM protein are highly sensitive to ionizing radiation. The relationship between ATM protein expression and radiosensitivity in 3 glioma cell lines was examined. T98G cells exhibited normal levels of ATM protein, whereas U118 and U87 cells had significantly lower levels of ATM and increased (>2-fold) sensitivity to ionizing radiation compared to T98G cells. The ATM promoter was methylated in U87 cells. Demethylation by azacytidine treatment increased ATM protein levels in the U87 cells and decreased their radiosensitivity. In contrast, the ATM promoter in U118 cells was not methylated. Further, expression of exogenous ATM did not significantly alter the radiosensitivity of U118 cells. ATM expression is therefore heterogeneous in the glioma cells examined. In conclusion, methylation of the ATM promoter may account for the variable radiosensitivity and heterogeneous ATM expression in a fraction of glioma cells.

Roy, Kanaklata [Division of Genomic Stability and DNA Repair, Department of Radiation Oncology, Harvard Medical School, Dana-Farber Cancer Institute, 44 Binney St, Boston, MA 02115 (United States); Wang, Lilin [Division of Genomic Stability and DNA Repair, Department of Radiation Oncology, Harvard Medical School, Dana-Farber Cancer Institute, 44 Binney St, Boston, MA 02115 (United States); Makrigiorgos, G. Mike [Division of Genomic Stability and DNA Repair, Department of Radiation Oncology, Harvard Medical School, Dana-Farber Cancer Institute, 44 Binney St, Boston, MA 02115 (United States); Price, Brendan D. [Division of Genomic Stability and DNA Repair, Department of Radiation Oncology, Harvard Medical School, Dana-Farber Cancer Institute, 44 Binney St, Boston, MA 02115 (United States)]. E-mail: brendan_price@dfci.harvard.edu

2006-06-09T23:59:59.000Z

85

Experimental study of the oxidation of methyl oleate in a jet-stirred reactor  

SciTech Connect

The experimental study of the oxidation of a blend containing n-decane and a large unsaturated ester, methyl oleate, was performed in a jet-stirred reactor over a wide range of temperature covering both low and high temperature regions (550-1100 K), at a residence time of 1.5 s, at quasi atmospheric pressure with high dilution in helium (n-decane and methyl oleate inlet mole fractions of 1.48 x 10{sup -3} and 5.2 x 10{sup -4}) and under stoichiometric conditions. The formation of numerous reaction products was observed. At low and intermediate temperatures, the oxidation of the blend led to the formation of species containing oxygen atoms like cyclic ethers, aldehydes and ketones deriving from n-decane and methyl oleate. At higher temperature, these species were not formed anymore and the presence of unsaturated species was observed. Because of the presence of the double bond in the middle of the alkyl chain of methyl oleate, the formation of some specific products was observed. These species are dienes and esters with two double bonds produced from the decomposition paths of methyl oleate and some species obtained from the addition of H-atoms, OH and HO{sub 2} radicals to the double bond. Experimental results were compared with former results of the oxidation of a blend of n-decane and methyl palmitate performed under similar conditions. This comparison allowed highlighting the similarities and the differences in the reactivity and in the distribution of the reaction products for the oxidation of large saturated and unsaturated esters. (author)

Bax, Sarah; Hakka, Mohammed Hichem; Glaude, Pierre-Alexandre; Herbinet, Olivier; Battin-Leclerc, Frederique [Laboratoire Reactions et Genie des Procedes, Nancy Universite, CNRS, ENSIC, BP 20451, 1 rue Grandville, 54001 Nancy (France)

2010-06-15T23:59:59.000Z

86

The methylation of benzoic and n-butyric acids by chloromethane in Phellinus pomaceus  

E-Print Network (OSTI)

The kinetics of carboxylic acid methylation by chloromethane (CH3Cl) in myceliaaf the fungus Phellinus pomaceus were examined. Substantial incorporation of C2H3- into ester was observed within 5 min of addition of C2H3Cl to washed mycelia in the presence of the non-physiological acceptor butyric acid, rendering it unlikely that CH3Cl was converted to a diffusible intermediate before acting as methyl donor. The rate of methyl butyrate biosynthesis attained a maximum of 0.14 pmol g-l h-l at 1-5 mM-butyric acid, with higher concentrations causing increasing inhibition. Exogenous CH3Cl did not affect methyl butyrate production implying that the rate of CH3Cl biosynthesis did not limit methylation. However, C2H3-incorporation from exogenous C2H3Cl into methyl butyrate rose sharply from 20 to 60 % between 1.5 and 4 mM-butyric acid, suggesting inhibition of CH3Cl biosynthesis by the acid, an interpretation supported by the rapid decline in gaseous CH3Cl release by mycelia between 1.5 and 2 mM-butyric acid. With the natural acceptor benzoic acid as substrate a significant increase in the rate of ester biosynthesis was obtained in the presence of exogenous CH3Cl. Ester biosynthesis was maximal (0.18 pmol g-l h-l) at 0.5 mM-benZOiC acid but fell extremely rapidly with increasing concentration. As with butyric acid supraoptimal concentrations halted CH3Cl release and increased C2H3-incorporation from exogenous C2H3Cl. Studies on C2H3-incorporation from exogenous C2H3Cl into ester revealed a linear relationship between the logarithm of the percentage C2H3-incorporation and the logarithm of C2H3Cl

Kieran J. Mcnally; David B. Harper. *t

1990-01-01T23:59:59.000Z

87

Chromosome-wide mapping of DNA methylation patterns in normal and malignant prostate cells reveals pervasive methylation of gene-associated and conserved intergenic sequences  

E-Print Network (OSTI)

-2 -1 0 1 2 3 4 5 6 Lo g 2 (F ol d hy pe rm et hy la tio n) in tu m or -n or m al p ai rs 0 35 -0.25 2.0 -0.25 2.0 0 1.0 LNCaP PrEC CpG density Phast Cons A B Tumor-Normal pairs sorted by extent of hypermethylation Additional #31;le 9. ... mammalian and vertebrate species (indicated by high phastCons scores > 0.8; [27]) compared with what would be expected by ran- dom chance (Figure 5A). Additionally, we found that the methylated and differentially methylated regions had a highly significant...

Yegnasubramanian, Srinivasan; Wu, Zhijin; Haffner, Michael C; Esopi, David; Aryee, Martin J; Badrinath, Raghav; He, Tony L; Morgan, James D; Carvalho, Benilton S; Zheng, Qizhi; De Marzo, Angelo M; Irizarry, Rafael A; Nelson, William G

2011-06-13T23:59:59.000Z

88

Stepwise DNA Methylation Changes Are Linked to Escape from Defined Proliferation Barriers and Mammary Epithelial Cell Immortalization  

SciTech Connect

The timing and progression of DNA methylation changes during carcinogenesis are not completely understood. To develop a timeline of aberrant DNA methylation events during malignant transformation, we analyzed genome-wide DNA methylation patterns in an isogenic human mammary epithelial cell (HMEC) culture model of transformation. To acquire immortality and malignancy, the cultured finite lifespan HMEC must overcome two distinct proliferation barriers. The first barrier, stasis, is mediated by the retinoblastoma protein and can be overcome by loss of p16(INK4A) expression. HMEC that escape stasis and continue to proliferate become genomically unstable before encountering a second more stringent proliferation barrier, telomere dysfunction due to telomere attrition. Rare cells that acquire telomerase expression may escape this barrier, become immortal, and develop further malignant properties. Our analysis of HMEC transitioning from finite lifespan to malignantly transformed showed that aberrant DNA methylation changes occur in a stepwise fashion early in the transformation process. The first aberrant DNA methylation step coincides with overcoming stasis, and results in few to hundreds of changes, depending on how stasis was overcome. A second step coincides with immortalization and results in hundreds of additional DNA methylation changes regardless of the immortalization pathway. A majority of these DNA methylation changes are also found in malignant breast cancer cells. These results show that large-scale epigenetic remodeling occurs in the earliest steps of mammary carcinogenesis, temporally links DNA methylation changes and overcoming cellular proliferation barriers, and provides a bank of potential epigenetic biomarkers that mayprove useful in breast cancer risk assessment.

Novak, Petr; Jensen, Taylor J.; Garbe, James C.; Stampfer, Martha R.; Futscher, Bernard W.

2009-04-20T23:59:59.000Z

89

Experimental and Computational Thermochemical Study of 2-and 3-Thiopheneacetic Acid Methyl Esters  

E-Print Network (OSTI)

, biodiagnostics, electronic and optoelectronic devices, and conductive polymers. The present study reports acid methyl esters. The enthalpies of combustion and vaporization were measured by a rotating-bomb of the compounds studied was carried out. Calculated enthalpies of formation, using atomization and isodesmic

Chickos, James S.

90

Double chromodomains cooperate to recognize the methylated histone H3 tail  

Science Conference Proceedings (OSTI)

Chromodomains are modules implicated in the recognition of lysine-methylated histone tails and nucleic acids. CHD (for chromo-ATPase/helicase-DNA-binding) proteins regulate ATP-dependent nucleosome assembly and mobilization through their conserved double chromodomains and SWI2/SNF2 helicase/ATPase domain. The Drosophila CHD1 localizes to the interbands and puffs of the polytene chromosomes, which are classic sites of transcriptional activity. Other CHD isoforms (CHD3/4 or Mi-2) are important for nucleosome remodelling in histone deacetylase complexes. Deletion of chromodomains impairs nucleosome binding and remodelling by CHD proteins. Here we describe the structure of the tandem arrangement of the human CHD1 chromodomains, and its interactions with histone tails. Unlike HP1 and Polycomb proteins that use single chromodomains to bind to their respective methylated histone H3 tails, the two chromodomains of CHD1 cooperate to interact with one methylated H3 tail. We show that the human CHD1 double chromodomains target the lysine 4-methylated histone H3 tail (H3K4me), a hallmark of active chromatin. Methylammonium recognition involves two aromatic residues, not the three-residue aromatic cage used by chromodomains of HP1 and Polycomb proteins. Furthermore, unique inserts within chromodomain 1 of CHD1 block the expected site of H3 tail binding seen in HP1 and Polycomb, instead directing H3 binding to a groove at the inter-chromodomain junction.

Flanagan, John F.; Mi, Li-Zhi; Chruszcz, Maksymilian; Cymborowski, Marcin; Clines, Katrina L.; Kim, Youngchang; Minor, Wladek; Rastinejad, Fraydoon; Khorasanizadeh, Sepideh (ANL/SBC); (UV)

2010-07-19T23:59:59.000Z

91

Combustion chemical kinetics of biodiesel and related compounds (methyl and ethyl esters): Experiments and  

E-Print Network (OSTI)

1 Combustion chemical kinetics of biodiesel and related compounds (methyl and ethyl esters and reduced exhaust emissions have led to the emergence of new fuels and combustion devices. Over the past ten years, considerable effort has gone into understanding combustion phenomena in relation to emerging fuel

92

Growth of diamond films using an enclosed methyl-acetylene and propadiene combustion flame  

E-Print Network (OSTI)

1 Growth of diamond films using an enclosed methyl-acetylene and propadiene combustion flame K Abstract Diamond growth in low pressure combustion flames was studied using a safer, more economical and chemical kinetic time scales in the combustion reactor. 1 Present Address: 3M Corporation, Bldg. 60-1N-01

Dandy, David

93

Enhanced diisobutene production in the presence of methyl tertiary butyl ether  

DOE Patents (OSTI)

In the liquid phase reaction of isobutene in the presence of resin cation exchange resins with itself in a C[sub 4] hydrocarbon stream to form dimers, the formation of higher polymers, oligomers, and co-dimer by-products is suppressed by the presence of 0.0001 to 1 mole per mole of isobutene of methyl tertiary butyl ether. 1 fig.

Smith, L.A. Jr.

1983-03-01T23:59:59.000Z

94

Thermochemistry of radicals formed by hydrogen abstraction from 1-butanol, 2-methyl-1-propanol, and butanal  

E-Print Network (OSTI)

, and butanal Ewa Papajak, Prasenjit Seal, Xuefei Xu, and Donald G. Truhlar Citation: J. Chem. Phys. 137, 104314 abstraction from 1-butanol, 2-methyl-1-propanol, and butanal Ewa Papajak, Prasenjit Seal, Xuefei Xu- propanol, and butanal. Electronic structure calculations for all conformers of the radicals were car- ried

Truhlar, Donald G

95

Scaling properties of diffusive electronic transport in graphene nanoribbons functionalized with methyl-groups  

Science Conference Proceedings (OSTI)

We present a systematic study of the electronic transport properties of graphene nanoribbons functionalized with methyl-groups. Our numerical simulations are based on the Green's function approach and the tight-binding description of graphene. In the ... Keywords: Electronic transport, Functionalization, Graphene nanoribbons

Alessandro Cresti

2013-06-01T23:59:59.000Z

96

Structure-Based Mechanistic Insights into DNMT1-Mediated Maintenance DNA Methylation  

SciTech Connect

DNMT1, the major maintenance DNA methyltransferase in animals, helps to regulate gene expression, genome imprinting, and X-chromosome inactivation. We report on the crystal structure of a productive covalent mouse DNMT1(731-1602)-DNA complex containing a central hemimethylated CpG site. The methyl group of methylcytosine is positioned within a shallow hydrophobic concave surface, whereas the cytosine on the target strand is looped out and covalently anchored within the catalytic pocket. The DNA is distorted at the hemimethylated CpG step, with side chains from catalytic and recognition loops inserting through both grooves to fill an intercalation-type cavity associated with a dual base flip-out on partner strands. Structural and biochemical data establish how a combination of active and autoinhibitory mechanisms ensures the high fidelity of DNMT1-mediated maintenance DNA methylation.

Song, Jikui; Teplova, Marianna; Ishibe-Murakami, Satoko; Patel, Dinshaw J. (MSKCC)

2012-03-26T23:59:59.000Z

97

State Restrictions on Methyl Tertiary Butyl Ether (released in AEO2006)  

Reports and Publications (EIA)

By the end of 2005, 25 States had barred, or passed laws banning, any more than trace levels of MTBE in their gasoline supplies, and legislation to ban MTBE was pending in 4 others. Some State laws address only MTBE; others also address ethers such as ethyl tertiary butyl ether (ETBE) and tertiary amyl methyl ether (TAME). AEO2006 assumes that all State MTBE bans prohibit the use of all ethers for gasoline blending.

Information Center

2006-02-01T23:59:59.000Z

98

Method of recycling lithium borate to lithium borohydride through methyl borate  

DOE Patents (OSTI)

This invention provides a method for the recycling of lithium borate to lithium borohydride which can be reacted with water to generate hydrogen for utilization as a fuel. The lithium borate by-product of the hydrogen generation reaction is reacted with hydrogen chloride and water to produce boric acid and lithium chloride. The boric acid and lithium chloride are converted to lithium borohydride through a methyl borate intermediate to complete the recycle scheme.

Filby, Evan E. (Rigby, ID)

1977-01-01T23:59:59.000Z

99

Durability of Poly(Methyl Methacrylate) Lenses Used in Concentrating Photovoltaic Technology (Revised) (Presentation)  

DOE Green Energy (OSTI)

Concentrating photovoltaic (CPV) technology recently gained interest based on its expected low levelized cost of electricity, high efficiency, and scalability. Many CPV systems employ Fresnel lenses composed of poly(methyl methacrylate) (PMMA) to obtain a high optical flux density on the cell. The optical and mechanical durability of these lenses, however, is not well established relative to the desired surface life of 30 years. Our research aims to quantify the expected lifetime of PMMA in key market locations (FL, AZ, and CO).

Miller, D. C.; Carloni, J. D.; Pankow, J. W.; Gjersing, E. L.; To, B.; Packard, C. E.; Kennedy, C. E.; Kurtz, S. R.

2012-01-01T23:59:59.000Z

100

CORRELATION OF DNA METHYLATION WITH MERCURY CONTAMINATION IN MARINE ORGANISMS: A CASE STUDY OF NOAA MUSSEL WATCH TISSUE SAMPLES  

E-Print Network (OSTI)

American oysters (Crassostrea virginica) obtained from the NOAA Mussel Watch program were screened for DNA methylation, a type of epigenetic response to stressors. Oysters were collected from sites in the Gulf of Mexico having high mercury contamination (measured by NOAA) and from sites with little to no measurable mercury. Assessment of anthropogenic stressors such as mercury in the coastal environment has traditionally relied upon species diversity indices or assays to determine lethal doses. However, these indices fail to examine sub-lethal impacts such as gene expression. A ‘global’ DNA methylation kit, recently introduced by Sigma-Aldrich, was used to spectrophotometrically compare the degree of methylation in DNA extracted from contaminated oysters and non-contaminated oysters. DNA methylation was higher in oysters from pristine sites than in oysters from contaminated sites.

Brinkmeyer, Robin; Taylor, Robert; Germ, Kaylyn E.

2011-08-04T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

Optimal estimation of the surface fluxes of methyl chloride using a 3-D global chemical transport model  

E-Print Network (OSTI)

Methyl chloride (CH3Cl) [CH subscript 3 Cl] is a chlorine-containing trace gas in the atmosphere contributing significantly to stratospheric ozone depletion. Large uncertainties in estimates of its source and sink magnitudes ...

Xiao, Xue

102

Methylation status and transcriptional expression of the MHC class I loci in human trophoblast cells from term placenta  

Science Conference Proceedings (OSTI)

Of the various molecular regulatory mechanisms that may be used by human trophoblast cells to down-regulate expression of HLA class I genes, we chose to investigate the methylation of DNA, generally associated with inhibition of transcription. We analyzed the methylation status of different HLA class I loci in villous and extravillous cytotrophoblast cells and in vitro-differentiated syncytiotrophoblast, purified from human term placenta, as well as in the human trophoblast-derived JAR and JEG-3 cell lines. We then compared methylation status and transcriptional activity. An inverse relationship was established between JAR and JEG-3: HLA-A, -B, and -G are methylated and repressed in JAR, whereas in JEG-3, HLA-A is methylated and repressed but HLA-B and -G are partially methylated and transcribed. HLA-E is unmethylated and transcribed in both cell lines. Apart from HLA-E, which is always unmethylated and transcribed, no such relationship exists for the other class I loci in trophoblast cells. Whereas nonclassical HLA-G and classical HLA-A and -B class I genes are undermethylated in both cytotrophoblast and syncytiotrophoblast, they are clearly transcribed in the former but minimally transcribed in the latter subpopulation. Thus, the down-regulation of class I gene expression in the in vitro-differentiated synctiotrophoblast is unlikely to be caused by DNA methylation. Furthermore, there is no detectable expression of any class I molecule at the cell surface of either trophoblast cell subpopulation, suggesting a negative control on translation and/or on the secretory pathway to the plasma membrane. 50 refs., 11 figs., 1 tab.

Guillaudeux, T.; Rodriguez, A.M.; Girr, M. [University Hospital Center Purpan, Toulouse (France)] [and others

1995-04-01T23:59:59.000Z

103

Scintillators with potential to supersede lanthanum bromide  

SciTech Connect

New scintillators for high-resolution gamma ray spectroscopy have been identified, grown and characterized. Our development efforts have focused on two classes of high light yield materials: Europium-doped alkaline earth halides and Cerium-doped garnets. Of the halide single crystals we have grown by the Bridgman method - SrI{sub 2}, CaI{sub 2}, SrBr{sub 2}, BaI{sub 2} and BaBr{sub 2} - SrI{sub 2} is the most promising. SrI{sub 2}(Eu) emits into the Eu{sup 2+} band, centered at 435 nm, with a decay time of 1.2 {micro}s and a light yield of up to 115,000 photons/MeV. It offers energy resolution better than 3% FWHM at 662 keV, and exhibits excellent light yield proportionality. Transparent ceramics fabrication allows production of Gadolinium- and Terbium-based garnets which are not growable by melt techniques due to phase instabilities. While scintillation light yields of Cerium-doped ceramic garnets are high, light yield non-proportionality and slow decay components appear to limit their prospects for high energy resolution. We are developing an understanding of the mechanisms underlying energy dependent scintillation light yield non-proportionality and how it affects energy resolution. We have also identified aspects of optical design that can be optimized to enhance energy resolution.

Cherepy, Nerine; Payne, Steven; Aszatlos, Steve; Hull, Giulia; Kuntz, J.; Niedermayr, Tom; Pimputkar, S.; Roberts, J.; Sanner, R.; Tillotson, T.; van Loef, Edger; Wilson, Cody; Shah, Kanai; Roy, U.; Hawrami, R.; Burger, Arnold; Boatner, Lynn; Choong, Woon-Seng; Moses, William

2009-06-01T23:59:59.000Z

104

Scintillators with potential to supersede lanthanum bromide  

E-Print Network (OSTI)

and by the National Nuclear Security Administration, OfficeNuclear Detection Office in the Department of Homeland Security (

Cherepy, Nerine

2010-01-01T23:59:59.000Z

105

Performance Evaluation of a 4.5 kW (1.3 Refrigeration Tons) Air-Cooled Lithium Bromide/Water Solar Powered (Hot-Water-Fired) Absorption Unit  

Science Conference Proceedings (OSTI)

During the summer months, air-conditioning (cooling) is the single largest use of electricity in both residential and commercial buildings with the major impact on peak electric demand. Improved air-conditioning technology has by far the greatest potential impact on the electric industry compared to any other technology that uses electricity. Thermally activated absorption air-conditioning (absorption chillers) can provide overall peak load reduction and electric grid relief for summer peak demand. This innovative absorption technology is based on integrated rotating heat exchangers to enhance heat and mass transfer resulting in a potential reduction of size, cost, and weight of the "next generation" absorption units. Rotartica Absorption Chiller (RAC) is a 4.5 kW (1.3 refrigeration tons or RT) air-cooled lithium bromide (LiBr)/water unit powered by hot water generated using the solar energy and/or waste heat. Typically LiBr/water absorption chillers are water-cooled units which use a cooling tower to reject heat. Cooling towers require a large amount of space, increase start-up and maintenance costs. However, RAC is an air-cooled absorption chiller (no cooling tower). The purpose of this evaluation is to verify RAC performance by comparing the Coefficient of Performance (COP or ratio of cooling capacity to energy input) and the cooling capacity results with those of the manufacturer. The performance of the RAC was tested at Oak Ridge National Laboratory (ORNL) in a controlled environment at various hot and chilled water flow rates, air handler flow rates, and ambient temperatures. Temperature probes, mass flow meters, rotational speed measuring device, pressure transducers, and a web camera mounted inside the unit were used to monitor the RAC via a web control-based data acquisition system using Automated Logic Controller (ALC). Results showed a COP and cooling capacity of approximately 0.58 and 3.7 kW respectively at 35 C (95 F) design condition for ambient temperature with 40 C (104 F) cooling water temperature. This is in close agreement with the manufacturer data of 0.60 for COP and 3.9 kW for cooling capacity. This study resulted in a complete performance map of RAC which will be used to evaluate the potential benefits of rotating heat exchangers in making the "next-generation" absorption chillers more compact and cost effective without any significant degradation in the performance. In addition, the feasibility of using rotating heat exchangers in other applications will be evaluated.

Zaltash, Abdolreza [ORNL; Petrov, Andrei Y [ORNL; Linkous, Randall Lee [ORNL; Vineyard, Edward Allan [ORNL

2007-01-01T23:59:59.000Z

106

In-cylinder pressure characteristics of a CI engine using blends of diesel fuel and methyl esters of beef tallow  

Science Conference Proceedings (OSTI)

A Cummins N14-410 diesel engine was operated on 12 fuels produced by blending methyl tallowate, methyl soyate, and ethanol with no. 2 diesel fuel. Engine in-cylinder pressure data were used to evaluate engine performance. Peak cylinder pressures for each fuel blend at all engine speeds were lower than peak pressure for diesel fuel with the exception of the 80% diesel, 13% methyl tallowate, and 7% ethanol; and the 80% diesel, 6.5% methyl tallowate, 6.5% methyl soyate and 7% ethanol blends. The indicated mean effective pressure (IMEP) values for all fuel blends were less than for diesel fuel. The differences in IMEP values correlated with differences in power output of the engine. Similarly, maximum rates of pressure rise for most fuel blends were less than for diesel fuel. It was concluded that the fuel blends used in this study would have no detrimental long-term effects on engine performance, wear, and knock. 6 refs., 4 figs., 7 tabs.

Ali, Y.; Hanna, M.A.; Borg, J.E. [Univ. of Nebraska, Lincoln, NE (United States)

1996-05-01T23:59:59.000Z

107

Autoignition measurements and a validated kinetic model for the biodiesel surrogate, methyl butanoate  

Science Conference Proceedings (OSTI)

The autoignition of methyl butanoate has been studied at 1 and 4 atm in a shock tube over the temperature range 1250-1760 K at equivalence ratios of 1.5, 1.0, 0.5, and 0.25 at fuel concentrations of 1.0 and 1.5%. These measurements are complemented by autoignition data from a rapid compression machine over the temperature range 640-949 K at compressed gas pressures of 10, 20, and 40 atm and at varying equivalence ratios of 1.0, 0.5, and 0.33 using fuel concentrations of 1.59 and 3.13%. The autoignition of methyl butanoate is observed to follow Arrhenius-like temperature dependence over all conditions studied. These data, together with speciation data reported in the literature in a flow reactor, a jet-stirred reactor, and an opposed-flow diffusion flame, were used to produce a detailed chemical kinetic model. It was found that the model correctly simulated the effect of change in equivalence ratio, fuel fraction, and pressure for shock tube ignition delays. The agreement with rapid compression machine ignition delays is less accurate, although the qualitative agreement is reasonable. The model reproduces most speciation data with good accuracy. In addition, the important reaction pathways over each regime have been elucidated by both sensitivity and flux analyses. (author)

Dooley, S.; Curran, H.J.; Simmie, J.M. [Combustion Chemistry Centre, National University of Ireland, Galway (Ireland)

2008-04-15T23:59:59.000Z

108

Characterization of the Deltaproteobacteria in Contaminated and Uncontaminated Surface Stream Sediments and Identification of Potential Mercury Methylators  

Science Conference Proceedings (OSTI)

Microbial communities were examined in surface stream sediments at five contaminated sites and one control site near Oak Ridge, TN in order to identify bacteria that could be contributing to mercury methylation. The phylogenetic composition of the sediment bacterial community was examined over three quarterly sampling periods (36 samples) using 16s rRNA pyrosequencing. Only 3064 sequences (0.85 % of the total community) were identified as Deltaproteobacteria by the RDP classifier at the 99% confidence threshold. Constrained ordination techniques indicated significant positive correlations between Desulfobulbus spp., Desulfonema spp. and Desulfobacca spp. and methyl mercury concentrations in the contaminated sites. On the contrary, the distribution of organisms related to Byssovorax was significantly correlated to inorganic carbon, nitrate and uranium concentrations. Overall, the abundance and richness of Deltaproteobacteria sequences were higher in the sediments of the site, while the majority of the members present at the contaminated sites were either known metal reducers/methylators or metal tolerant species.

Mosher, Jennifer J [ORNL; Vishnivetskaya, Tatiana A [ORNL; Elias, Dwayne A [ORNL; Podar, Mircea [ORNL; Brooks, Scott C [ORNL; Brown, Steven D [ORNL; Brandt, Craig C [ORNL; Palumbo, Anthony Vito [ORNL

2012-01-01T23:59:59.000Z

109

Heterogeneous catalyst for the production of acetic anhydride from methyl acetate  

DOE Patents (OSTI)

This invention relates to a process for producing acetic anhydride by the reaction of methyl acetate, carbon monoxide, and hydrogen at elevated temperatures and pressures in the presence of an alkyl halide and a heterogeneous, bifunctional catalyst that contains an insoluble polymer having pendant quaternized phosphine groups, some of which phosphine groups are ionically bonded to anionic Group VIII metal complexes, the remainder of the phosphine groups being bonded to iodide. In contrast to prior art processes, no accelerator (promoter) is necessary to achieve the catalytic reaction and the products are easily separated from the catalyst by filtration. The catalyst can be recycled for consecutive runs without loss in activity. Bifunctional catalysts for use in carbonylating dimethyl ether are also provided.

Ramprasad, Dorai (Allentown, PA); Waller, Francis Joseph (Allentown, PA)

1999-01-01T23:59:59.000Z

110

Generation kinetics of color centers in irradiated poly(4-methyl-1-pentene)  

SciTech Connect

The transient absorbance of poly(4-methyl-1-pentene) (PMP) irradiated with gamma rays at elevated temperatures has been investigated. The absorbance in the ultraviolet and visible range increases with gamma ray dose. A bathochromic shift in transmission spectra emerges significantly upon irradiation. A first-order generation model is proposed to analyze the kinetics of color centers during annealing. The activation energy of the color center increases with increasing gamma ray dose. The equilibrium behavior of color centers in PMP is similar to that of vacancies in metals, and the formation energy of color centers in PMP decreases with increasing gamma ray dose. However, annealable color centers are not observed in this study.

Peng, J. S.; Li, C. L.; Lee, Sanboh [Department of Materials Science and Engineering National Tsing Hua University, Hsinchu 300, Taiwan (China); Chou, K. F. [Department of Biomechanical Engineering Yuanpei University, Hsinchu 300, Taiwan (China)

2011-09-15T23:59:59.000Z

111

Mesoscale simulation of shocked poly-(4-methyl-1-pentene) (PMP) foams.  

Science Conference Proceedings (OSTI)

Hydrocarbon foams are commonly used in HEDP experiments, and are subject to shock compression from tens to hundreds of GPa. Modeling foams is challenging due to the heterogeneous character of the foam. A quantitative understanding of foams under strong dynamic compression is sought. We use Sandia's ALEGRA-MHD code to simulate 3D mesoscale models of pure poly(4-methyl-1-petene) (PMP) foams. We employ two models of the initial polymer-void structure of the foam and analyze the statistical properties of the initial and shocked states. We compare the simulations to multi-Mbar shock experiments at various initial foam densities and flyer impact velocities. Scatter in the experimental data may be a consequence of the initial foam inhomogeneity. We compare the statistical properties the simulations with the scatter in the experimental data.

Schroen, Diana Grace; Flicker, Dawn G.; Haill, Thomas A.; Root, Seth; Mattsson, Thomas Kjell Rene

2011-06-01T23:59:59.000Z

112

Chemical ionization tandem mass spectrometer for the in situ measurement of methyl hydrogen peroxide  

SciTech Connect

A new approach for measuring gas-phase methyl hydrogen peroxide [(MHP) CH{sub 3}OOH] utilizing chemical ionization mass spectrometry is presented. Tandem mass spectrometry is used to avoid mass interferences that hindered previous attempts to measure atmospheric CH{sub 3}OOH with CF{sub 3}O{sup -} clustering chemistry. CH{sub 3}OOH has been successfully measured in situ using this technique during both airborne and ground-based campaigns. The accuracy and precision for the MHP measurement are a function of water vapor mixing ratio. Typical precision at 500 pptv MHP and 100 ppmv H{sub 2}O is {+-}80 pptv (2 sigma) for a 1 s integration period. The accuracy at 100 ppmv H{sub 2}O is estimated to be better than {+-}40%. Chemical ionization tandem mass spectrometry shows considerable promise for the determination of in situ atmospheric trace gas mixing ratios where isobaric compounds or mass interferences impede accurate measurements.

St Clair, Jason M.; McCabe, David C. [Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125 (United States); Crounse, John D. [Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125 (United States); Steiner, Urs [Varian, Inc., Santa Clara, California 95051 (United States); Wennberg, Paul O. [Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125 (United States); Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125 (United States)

2010-09-15T23:59:59.000Z

113

Methyl Chloride from Direct Methane Partial Oxidation: A High-Temperature Shilov-Like Catalytic System  

SciTech Connect

The intention of this study is to demonstrate and evaluate the scientific and economic feasibility of using special solvents to improve the thermal stability of Pt-catalyst in the Shilov system, such that a high reaction temperature could be achieved. The higher conversion rate (near 100%) of methyl chloride from partial oxidation of methane under the high temperature ({approx} 200 C) without significant Pt0 precipitation has been achieved. High concentration of the Cl- ion has been identified as the key for the stabilization of the Pt-catalysts. H/D exchange measurements indicated that the over oxidation will occur at the elevated temperature, developments of the effective product separation processes will be necessary in order to rationalize the industry-visible CH4 to CH3Cl conversion.

Yongchun Tang; John (Qisheng) Ma

2012-03-23T23:59:59.000Z

114

Raman spectra of bilayer graphene covered with Poly(methyl methacrylate) thin film  

SciTech Connect

The Raman spectra of bilayer graphene covered with poly(methyl methacrylate) (PMMA) were investigated. Both the G and 2D peaks of PMMA-coated graphene were stiff and broad compared with those of uncovered graphene. This could be attributed to the residual strain induced by high-temperature baking during fabrication of the nanodevice. Furthermore, the two 2D peaks stiffened and broadened with increasing laser power, which is just the reverse to uncovered graphene. The stiffness is likely caused by graphene compression induced by the circular bubble of the thin PMMA film generated by laser irradiation. Our findings may contribute to the application of PMMA in the strain engineering of graphene nanodevices.

Xia Minggang [MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Science, Xi'an Jiaotong University, 710049 (China); Center on Experimental Physics, School of Science, Xi'an Jiaotong University, 710049 (China); Su Zhidan; Zhang Shengli [MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Science, Xi'an Jiaotong University, 710049 (China); Department of Applied Physics, School of Science, Xi'an Jiaotong University, 710049 (China)

2012-09-15T23:59:59.000Z

115

Methyl quantum tunneling and nitrogen-14 NQR NMR studies using a SQUID magnetic resonance spectrometer  

Science Conference Proceedings (OSTI)

Nuclear Magnetic Resonance (NMR) and Nuclear Quadrupole Resonance (NQR) techniques have been very successful in obtaining molecular conformation and dynamics information. Unfortunately, standard NMR and NQR spectrometers are unable to adequately detect resonances below a few megahertz due to the frequency dependent sensitivity of their Faraday coil detectors. For this reason a new spectrometer with a dc SQUID (Superconducting Quantum Interference Device) detector, which has no such frequency dependence, has been developed. Previously, this spectrometer was used to observe {sup 11}B and {sup 27}Al NQR resonances. The scope of this study was increased to include {sup 23}Na, {sup 51}V, and {sup 55}Mn NQR transitions. Also, a technique was presented to observe {sup 14}N NQR resonances through cross relaxation of the nitrogen polarization to adjacent proton spins. When the proton Zeeman splitting matches one nitrogen quadrupoler transition the remaining two {sup 14}N transitions can be detected by sweeping a saturating rf field through resonance. Additionally, simultaneous excitation of two nitrogen resonances provides signal enhancement which helps to connect transitions from the same site. In this way, nitrogen-14 resonances were observed in several amino acids and polypeptides. This spectrometer has also been useful in the direct detection of methyl quantum tunneling splittings at 4.2 K. Tunneling, frequencies of a homologous series of carboxylic acids were measured and for solids with equivalent crystal structures, an exponential correlation between the tunneling frequency and the enthalpy of fusion is observed. This correlation provides information about the contribution of intermolecular interactions to the energy barrier for methyl rotation.

Black, B.E. [Univ. of California, Berkeley, CA (United States). Dept. of Chemistry]|[Lawrence Berkeley Lab., CA (United States)

1993-07-01T23:59:59.000Z

116

Structural basis of SETD6-mediated regulation of the NF-kB network via methyl-lysine signaling  

SciTech Connect

SET domain containing 6 (SETD6) monomethylates the RelA subunit of nuclear factor kappa B (NF-{kappa}B). The ankyrin repeats of G9a-like protein (GLP) recognizes RelA monomethylated at Lys310. Adjacent to Lys310 is Ser311, a known phosphorylation site of RelA. Ser311 phosphorylation inhibits Lys310 methylation by SETD6 as well as binding of Lys310me1 by GLP. The structure of SETD6 in complex with RelA peptide containing the methylation site, in the presence of S-adenosyl-l-methionine, reveals a V-like protein structure and suggests a model for NF-{kappa}B binding to SETD6. In addition, structural modeling of the GLP ankyrin repeats bound to Lys310me1 peptide provides insight into the molecular basis for inhibition of Lys310me1 binding by Ser311 phosphorylation. Together, these findings provide a structural explanation for a key cellular signaling pathway centered on RelA Lys310 methylation, which is generated by SETD6 and recognized by GLP, and incorporate a methylation-phosphorylation switch of adjacent lysine and serine residues. Finally, SETD6 is structurally similar to the Rubisco large subunit methyltransferase. Given the restriction of Rubisco to plant species, this particular appearance of the protein lysine methyltransferase has been evolutionarily well conserved.

Chang, Yanqi; Levy, Dan; Horton, John R.; Peng, Junmin; Zhang, Xing; Gozani, Or; Cheng, Xiaodong (Emory-MED); (Stanford)

2011-10-10T23:59:59.000Z

117

Whole Genome Analysis of Functional Protein Binding Sites and DNA Methylation: Application to p53 and Low Dose Ionizing Radiation.  

NLE Websites -- All DOE Office Websites (Extended Search)

Whole Genome Analysis of Functional Protein Binding Sites and DNA Methylation: Whole Genome Analysis of Functional Protein Binding Sites and DNA Methylation: Application to p53 and Low Dose Ionizing Radiation. Krassimira Botcheva, John J. Dunn and Carl W. Anderson Biology Department, Brookhaven National Laboratory, Upton, NY 11973, USA The effects of exposure to low doses of ionizing radiation on humans results largely from changes in gene expression mediated by the activation of sequence-specific DNA binding proteins (transcription factors) as well as changes to other chromosomal proteins and perhaps to DNA. To develop a molecular understanding of the consequences of exposures to low doses of ionizing radiation, it will be necessary to understanding where radiation-activated transcription factors bind in whole genomes and how

118

Inhalation developmental toxicology studies: Teratology study of methyl ethyl ketone in mice: Final report  

Science Conference Proceedings (OSTI)

Methyl ethyl ketone (MEK) is a widely used industrial solvent which results in considerable human exposure. In order to assess the potential for MEK to cause developmental toxicity in rodents, four groups of Swiss (CD-1) mice were exposed to 0, 400, 1000 or 3000 ppM MEK vapors, 7 h/day, 7 dy/wk. Ten virgin females and approx.30 plug-positive females per group were exposed concurrently for 10 consecutive days (6--15 dg for mated mice). Body weights were obtained throughout the study period, and uterine and fetal body weights were obtained at sacrifice on 18 dg. Uterine implants were enumerated and their status recorded. Live fetuses were sexed and examined for gross, visceral, skeletal, and soft-tissue craniofacial defects. Exposure of pregnant mice to these concentrations of MEK did not result in apparent maternal toxicity, although there was a slight, treatment-correlated increase in liver to body weight ratios which was significant for the 3000-ppM group. Mild developmental toxicity was evident at 3000-ppM as a reduction in mean fetal body weight. This reduction was statistically significant for the males only, although the relative decrease in mean fetal body weight was the same for both sexes. 17 refs., 4 figs., 10 tabs.

Mast, T.J.; Dill, J.A.; Evanoff, J.J.; Rommereim, R.L.; Weigel, R.J.; Westerberg, R.B.

1989-02-01T23:59:59.000Z

119

Durability of Poly(Methyl Methacrylate) Lenses Used in Concentrating Photovoltaic Modules: Preprint  

Science Conference Proceedings (OSTI)

Concentrating photovoltaic (CPV) technology has recently gained interest based on their expected low levelized cost of electricity, high efficiency, and scalability. Many CPV systems use Fresnel lenses made of poly(methyl methacrylate)(PMMA) to obtain a high optical flux density. The optical and mechanical durability of such components, however, are not well established relative to the desired service life of 30 years. Specific reliability issues may include: reduced optical transmittance, discoloration, hazing, surface erosion, embrittlement, crack growth, physical aging, shape setting (warpage), and soiling. The initial results for contemporary lens- and material-specimens aged cumulatively to 6 months are presented. The study here uses an environmental chamber equipped with a xenon-arc lamp to age specimens at least 8x the nominal field rate. A broad range in the affected characteristics (including optical transmittance, yellowness index, mass loss, and contact angle) has been observed to date, depending on the formulation of PMMA used. The most affected specimens are further examined in terms of their visual appearance, surface roughness (examined via atomic force microscopy), and molecular structure (via Fourier transform infrared spectroscopy).

Miller, D. C.; Gedvilas, L. M.; To, B.; Kennedy, C. E.; Kurtz, S. R.

2010-08-01T23:59:59.000Z

120

Synthesis of methyl methacrylate from coal-derived syngas: Quarterly report,, October 1-December 31, 1997  

SciTech Connect

Research Triangle Institute (RTI), Eastman Chemical Company, and Bechtel collectively are developing a novel process for the synthesis of methyl methacrylate (MMA) from coal-derived syngas that consists of three steps of synthesis of a propionate, its condensation with formaldehyde, and esterification of resulting methacrylic acid (MAA) with methanol to produce MMA. Over the last quarter, Eastman developed two new processes which have resulted in two new invention reports. One process deals with carbonylation of benzyl ether which represents a model for coal liquefaction and the second focuses on the acceleration of carbonylation rates for propionic acid synthesis, via use of polar aprotic solvents. These two inventions are major improvements in the novel Mo-catalyzed homogeneous process for propionic acid synthesis technology, developed by Eastman. Over the last quarter, RTI completed three reaction cycles and two regeneration cycles as a part of long-term reaction regeneration cycle study on a 10% Nb{sub 2}O{sub 5}/Si0{sub 2} catalyst, for vapor phase condensation reaction of formaldehyde with propionic acid.

NONE

1998-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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.


121

Association Behavior of Poly(methacrylic acid)-block-Poly(methyl methacrylate) in Aqueous Medium: Potentiometric and Laser Light Scattering Studies  

E-Print Network (OSTI)

Atom transfer radical polymerisation (ATRP) technique was used to synthesize poly(methacrylic acid-block-methyl methacrylate) (P(MAA???-b-MMA??)) copolymer in order to study the aggregation behavior in aqueous solution ...

Palaniswamy, R.

122

Lipid Analysis and Lipidomics: New Techniques & Application-Ch 6Structural Analysis of Unsaturated Fatty Acid Methyl Ester Isomers with Acetonitrile Covalent Adduct Chemical Ionization  

Science Conference Proceedings (OSTI)

Lipid Analysis and Lipidomics: New Techniques & Application-Ch 6 Structural Analysis of Unsaturated Fatty Acid Methyl Ester Isomers with Acetonitrile Covalent Adduct Chemical Ionization Methods and Analyses eChapters Methods - Analyses Book

123

Advances in Conjugated Linoleic Acid Research, Volume 3Chapter 6 Structural Characterization of CLA Methyl Esters with Acetonitrile Chemical Ionization Tandem Mass Spectrometry  

Science Conference Proceedings (OSTI)

Advances in Conjugated Linoleic Acid Research, Volume 3 Chapter 6 Structural Characterization of CLA Methyl Esters with Acetonitrile Chemical Ionization Tandem Mass Spectrometry Health Nutrition Biochemistry eChapters Health - Nutrition

124

Laboratory and tentative interstellar detection of trans-methyl formate using the publicly available Green Bank Telescope PRIMOS survey  

E-Print Network (OSTI)

The rotational spectrum of the higher-energy trans conformational isomer of methyl formate has been assigned for the first time using several pulsed-jet Fourier transform microwave spectrometers in the 6-60 GHz frequency range. This species has also been sought toward the Sagittarius B2(N) molecular cloud using the publicly available PRIMOS survey from the Green Bank Telescope. We detect seven absorption features in the survey that coincide with laboratory transitions of trans-methyl formate, from which we derive a column density of 3.1 (+2.6, -1.2) \\times 10^13 cm-2 and a rotational temperature of 7.6 \\pm 1.5 K. This excitation temperature is significantly lower than that of the more stable cis conformer in the same source but is consistent with that of other complex molecular species recently detected in Sgr B2(N). The difference in the rotational temperatures of the two conformers suggests that they have different spatial distributions in this source. As the abundance of trans-methyl formate is far higher ...

Neill, Justin L; Zaleski, Daniel P; Steber, Amanda L; Pate, Brooks H; Lattanzi, Valerio; Spezzano, Silvia; McCarthy, Michael C; Remijan, Anthony J

2012-01-01T23:59:59.000Z

125

Microhydration Effects on the Intermediates of the SN2 Reacation of Iodide Anion with Methyl Iodine  

SciTech Connect

Reactions of halide anions with methyl halides (X- + CH3Y ? XCH3 + Y-) are bimolecular nucleophilic substitution (SN2) reactions that have been well investigated in the last few decades.[1] Figure 1 shows typical potential energy surfaces (PESs) proposed for symmetric (X- + CH3X ? XCH3 + X-) SN2 reactions along the reaction coordinate. In the gas phase, the PES has two minima corresponding to the stable X-(CH3X) complexes.[2] The PES is substantially distorted by the solvation. Since the negative charge is delocalized over the [X•••CH3•••X]- moiety at the transition state the stabilization energy gained by the solvation is smaller for the transition state than that for the (X- + CH3X) reactants or the X- (CH3X) complexes. In solution, a large potential barrier exists between the reactants and products. The rate constants of these reactions in protic solvents were reported to be a few orders of magnitude smaller than those in aprotic solvents; this trend was explained by the formation of solvation shells of protic molecules around the halide anions.[1,3] Morokuma has previously reported a theoretical study on the PES of the (Cl- + CH3Cl ? ClCH3 + Cl-) SN2 reaction with a few H2O molecules. The attachment of H2O molecules to the Cl-(CH3Cl) reactive system produces metastable isomers, which affect the reaction mechanism.[4] Johnson and coworkers extensively investigated the structure and reactions of halide anion complexes in the gas phase using photodissociation spectroscopy.

Doi, Keisuke; Togano, Eijiro; Xantheas, Sotiris S.; Nakanishi, Ryuzo; Nagata, Takashi; Ebata, Takayuki; Inokuchi, Yoshiya

2013-04-15T23:59:59.000Z

126

Photodissociation of methyl iodide adsorbed on low-temperature amorphous ice surfaces  

SciTech Connect

Photodissociation dynamics of methyl iodide (CH{sub 3}I) adsorbed on both amorphous solid water (ASW) and porous amorphous solid water (PASW) has been investigated. The ejected ground-state I({sup 2}P{sub 3/2}) and excited-state I({sup 2}P{sub 1/2}) photofragments produced by 260- and 290-nm photons were detected using laser resonance-enhanced multiphoton ionization. In contrast to gas-phase photodissociation, (i) the I({sup 2}P{sub 3/2}) photofragment is favored compared to I({sup 2}P{sub 1/2}) at both wavelengths, (ii) I({sup 2}P{sub 3/2}) and I({sup 2}P{sub 1/2}) have velocity distributions that depend upon ice morphology, and (iii) I{sub 2} is produced on ASW. The total iodine [I({sup 2}P{sub 3/2})+I({sup 2}P{sub 1/2})+I{sub 2}] yield varies with substrate morphology, with greater yield from ASW than PASW using both 260- and 290-nm photons. Temperature-programmed desorption studies demonstrate that ice porosity enhances the trapping of adsorbed CH{sub 3}I, while pore-free ice likely allows monomer adsorption and the formation of two-dimensional CH{sub 3}I clusters. Reactions or collisions involving these clusters, I atomic fragments, or I-containing molecular fragments at the vacuum-surface interface can result in I{sub 2} formation.

DeSimone, Alice J.; Olanrewaju, Babajide O.; Grieves, Gregory A. [School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400 (United States); Orlando, Thomas M. [School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400 (United States); School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400 (United States)

2013-02-28T23:59:59.000Z

127

Methyl-parathion decreases sperm function and fertilization capacity after targeting spermatocytes and maturing spermatozoa  

Science Conference Proceedings (OSTI)

Paternal germline exposure to organophosphorous pesticides (OP) has been associated with reproductive failures and adverse effects in the offspring. Methyl parathion (Me-Pa), a worldwide-used OP, has reproductive adverse effects and is genotoxic to sperm. Oxidative damage has been involved in the genotoxic and reproductive effects of OP. The purpose of this study was to determine the effects of Me-Pa on spermatozoa function and ability to fertilize. Male mice were exposed to Me-Pa (20 mg/kg bw, i.p.) and spermatozoa from epididymis-vas deferens were collected at 7 or 28 days post-treatment (dpt) to assess the effects on maturing spermatozoa and spermatocytes, respectively. DNA damage was evaluated by nick translation (NT-positive cells) and SCSA (percentDFI); lipoperoxidation (LPO) by malondialdehyde production; sperm function by spontaneous- and induced-acrosome reactions (AR); mitochondrial membrane potential (MMP) by using the JC-1 flurochrome; and, fertilization ability by an in vitro assay and in vivo mating. Results showed alterations in DNA integrity (percentDFI and NT-positive cells) at 7 and 28 dpt, in addition to decreased sperm quality and a decrease in induced-AR; reduced MMP and LPO was observed only at 7 dpt. We found negative correlations between LPO and all sperm alterations. Altered sperm functional parameters were associated with reduced fertilization rates at both times, evaluated either in vitro or in vivo. These results show that Me-Pa exposure of maturing spermatozoa and spermatocytes affects many sperm functional parameters that result in a decreased fertilizing capacity. Oxidative stress seems to be a likely mechanism ofthe detrimental effects of Me-Pa in male germ cells.

Pina-Guzman, Belem; Sanchez-Gutierrez, M.; Marchetti, Francesco; Hernandez-Ochoa, I.; Solis-Heredia, M.J .; Quintanilla-Vega, B.

2009-05-03T23:59:59.000Z

128

Separation of Dimethyl Ether from Syn-Gas Components by Poly(dimethylsiloxane) and Poly(4-methyl-1-pentene) Membranes  

Science Conference Proceedings (OSTI)

Permeability and selectivity in gas transport through poly(4-methyl-1-pentene) (TPX) and poly(dimethylsiloxane) (PDMS) using variable temperature mixed gas experiments is reported. Selected gases include H2, CO, CH4, CO2, and dimethyl ether (DME). The DME data is the first to be reported through these membranes. In this paper, the chosen polymers reflect both rubbery and crystalline materials. Rubbery polymers tend to be weakly size sieving, which, in this work, has resulted in larger permeabilities, lower separation factors, and lower activation energies of permeation (Ep). Conversely, the crystalline TPX membranes showed much greater sensitivity to penetrant size; although the gas condensability also played a role in transport.

Christopher J. Orme; Frederick F. Stewart

2011-05-01T23:59:59.000Z

129

Weak maser emission of methyl formate toward Sagittarius B2(N) in the Green Bank Telescope PRIMOS Survey  

E-Print Network (OSTI)

A non-LTE radiative transfer treatment of cis-methyl formate (HCOOCH3) rotational lines is presented for the first time using a set of theoretical collisional rate coefficients. These coefficients have been computed in the temperature range 5-30 K by combining coupled-channel scattering calculations with a high accuracy potential energy surface for HCOOCH3-He. The results are compared to observations toward the Sagittarius B2(N) molecular cloud using the publicly available PRIMOS survey from the Green Bank Telescope. A total of 49 low-lying transitions of methyl formate, with upper levels below 25 K, are identified. These lines are found to probe a presumably cold (~30 K), moderately dense (~1e4 cm-3) and extended region surrounding Sgr B2(N). The derived column density of ~4e14 cm-2 is only a factor of ~10 larger than the column density of the trans conformer in the same source. Provided that the two conformers have the same spatial distribution, this result suggests that strongly non-equilibrium processes m...

Faure, Alexandre; Szalewicz, Krzysztof; Wiesenfeld, Laurent

2014-01-01T23:59:59.000Z

130

Horizontal Surface Tension Gradients Induced in Monolayers by Gravity Water Wave Action  

Science Conference Proceedings (OSTI)

Surface tension gradients have been measured for three different monolayers (oleyl alcohol, palmitic acid methyl ester and cetyl trimethyl ammonium bromide) spread on a wavy water surface (waves with 1-Hz frequency; 2 cm wave height). The wave-...

Philipp A. Lange; Heinrich Hühnerfuss

1984-10-01T23:59:59.000Z

131

Copper(II) bis [2-((E)-2-(pyrid-2-yl)ethylimino)methyl)-6-bromo-4-chlorophenolate  

Science Conference Proceedings (OSTI)

A new complex CuL{sub 2} [HL = 2-((E)-(2-(pyridin-2-yl)ethylimino)methyl)-6-bromo-4-chlorophenol] was synthesized, and its structure (C{sub 28}H{sub 22}Br{sub 2}Cl{sub 2}CuN{sub 4}O{sub 2}, Mr = 740.76) was determined by single-crystal X-ray diffraction analysis. The crystal belongs to the triclinic system, space group P1{sup -}, with a = 5.157(6), b = 12.090(1), c =12.310(1) A, {alpha} = 113.962(2) Degree-Sign , {beta} = 96.7910(10) Degree-Sign , {gamma} = 90.0300(10) Degree-Sign , V = 695.4(8) A{sup 3}, Z = 1, R = 0.0481. The complex molecules are linked via the weak C-H...N hydrogen bonds, leading to the formation of one dimension (1D) chains along the a axis.

Zhang, X. L., E-mail: zhangxinli6008@163.com [Baoji University of Arts and Sciences, Department of Chemistry and Chemical Engineering (China)

2013-01-15T23:59:59.000Z

132

Experimental investigation of size effect on thermal conductivity for ultra-thin amorphous poly(methyl methacrylate) (PMMA) films  

E-Print Network (OSTI)

An investigation was conducted to determine whether a “size effect” phenomenon for one particular thermophysical property, thermal conductivity, actually exists for amorphous poly(methyl methacrylate) (PMMA) films with thicknesses ranging from 40 nm to 2 ?m. This was done by using a non-contact, non-invasive, in-situ Transient Thermo-Reflectance (TTR) laser based technique. The results demonstrated that the intrinsic thermal conductivity of a 40 nm PMMA film deposited on native oxide of silicon increases by a factor of three over bulk PMMA values, and a distinct increase in the thermal conductivity of PMMA film was observed in ultra-thin (sub 100 nm) films. This confirmed the importance of film thickness for the through-plane thermal conductivity value of PMMA film on native oxide of silicon.

Kim, Ick Chan

2007-05-01T23:59:59.000Z

133

(E)-2-[(2-Bromophenylimino)methyl]-5-methoxyphenol: X-ray and DFT-calculated structures  

SciTech Connect

The crystal structure of (E)-2-[(2-Bromophenylimino)methyl]-5-methoxyphenol is determined by using X-ray diffraction and then the molecular structure is investigated with density functional theory (DFT). X-Ray study shows that the title compound has a strong intramolecular O-H-N hydrogen bond and three dimensional crystal structure is primarily determined by C-H-{pi} and weak van der Waals interactions. The strong O-H-N bond is an evidence of the preference for the phenol-imine tautomeric form in the solid state. Optimized molecular geometry is calculated with DFT at the B3LYP/6-31G(d,p) level. The IR spectra of compound were recorded experimentally and calculated to compare with each other. The results from both experiment and theoretical calculations are compared in this study.

Kosar, B., E-mail: bkosar@omu.edu.tr; Albayrak, C. [Sinop University, Faculty of Education (Turkey); Odabasoglu, M. [Pamukkale University, Chemistry Program (Turkey); Bueyuekguengoer, O. [Ondokuz Mayis University, Faculty of Arts and Sciences (Turkey)

2010-12-15T23:59:59.000Z

134

In situ synthesis of poly (methyl methacrylate)/SiO2 hybrid nanocomposites via "Grafting Onto" strategy based on UV irradiation in the presence of iron aqueous solution  

Science Conference Proceedings (OSTI)

Poly(methyl methacrylate)/SiO2 (PMMA/SiO2) hybrid composites were prepared via "grafting onto" strategy based on UV irradiation in the presence of iron aqueous solution. Two steps were used to graft polymethyl methacrylate (PMMA) ...

Hong Zhang; Chao Li; Jinshan Guo; Limin Zang; Jiahe Luo

2012-01-01T23:59:59.000Z

135

Methyl tert-butyl ether (MTBE) is a volatile organic com-pound (VOC) derived from natural gas that is added to gas-  

E-Print Network (OSTI)

Methyl tert-butyl ether (MTBE) is a volatile organic com- pound (VOC) derived from natural gas Water in Urban and Agricultural Areas made from methanol, which is derived primarily from natural gas that is added to gas- oline either seasonally or year round in many parts of the United States to increase

136

Statistical thermodynamics of 1-butanol, 2-methyl-1-propanol, and butanal Prasenjit Seal, Ewa Papajak, Tao Yu, and Donald G. Truhlar  

E-Print Network (OSTI)

Statistical thermodynamics of 1-butanol, 2-methyl-1-propanol, and butanal Prasenjit Seal, Ewa-body decomposition of ethanedial, propanal, propenal, n-butane, 1-butene, and 1,3-butadiene J. Chem. Phys. 136, and butanal Prasenjit Seal, Ewa Papajak, Tao Yu, and Donald G. Truhlara) Department of Chemistry

Truhlar, Donald G

137

021- Polyimide-Tantalum Bromide Synthesis of Tantalum Carbide  

Science Conference Proceedings (OSTI)

125- Influence of Gas Flow Rate Ratio on the Structural Properties of a-SiC:H Prepared by ... 145- The Synergy of XRD and XRF in a Shale and Slate Analysis.

138

Structural and chemical properties of the nitrogen-rich energetic material triaminoguanidinium 1-methyl-5-nitriminotetrazolate under pressure  

DOE Green Energy (OSTI)

The structural and chemical properties of the bi-molecular, hydrogen-bonded, nitrogen-rich energetic material triaminoguanidinium 1-methyl-5-nitriminotetrazolate C{sub 3}H{sub 12}N{sub 12}O{sub 2} (TAG-MNT) have been investigated at room pressure and under high pressure isothermal compression using powder x-ray diffraction and Raman and infrared spectroscopy. A stiffening of the equation of state and concomitant structural relaxation between 6 and 14 GPa are found to correlate with Raman mode disappearances, frequency discontinuities, and changes in the pressure dependence of modes. These observations manifest the occurrence of a reversible martensitic structural transformation to a new crystalline phase. The onset and vanishing of Fermi resonance in the nitrimine group correlate with the stiffening of the equation of state and phase transition, suggesting a possible connection between these phenomena. Beyond 15 GPa, pressure induces irreversible chemical reactions, culminating in the formation of a polymeric phase by 60 GPa.

McWilliams, R. Stewart; Kadry, Yasmin; Mahmood, Mohammad F.; Goncharov, Alexander F.; Ciezak-Jenkins, Jennifer (Howard); (CIW); (USARL)

2012-12-10T23:59:59.000Z

139

Synthesis of octane enhancers during slurry-phase Fischer-Tropsch. [801Methyl tert-butyl ether  

DOE Green Energy (OSTI)

The objective of this project is to investigate three possible routes to the formation of ethers, in particular methyl tert-butyl ether (MTBE), during slurry phase Fischer-Tropsch reaction. The three reaction schemes to be investigated are: (1) Addition of isobutylene during the formation of methanol and/or higher alcohols directly from CO and H{sub 2} during slurry-phase Fischer-Tropsch. (2) Addition of isobutylene to FT liquid products including alcohols in a slurry-phase reactor containing an MTBE or other acid catalyst. (3) Addition of methanol to slurry phase FT synthesis making iso-olefins. During the sixth quarter we completed the construction of the slurry bubble column reactor (SBCR), conducted initial shake-down experiments in a cold-flow mode, and finalized the selection process of the acid catalysts for conversion of syngas-produced alcohols and isobutylene to MTBE (scheme 2). Tasks 3, 4, and 5 are awaiting complete implementation of the SBCR system.

Marcelin, G.

1992-06-24T23:59:59.000Z

140

Dose-response analysis of infants prenatally exposed to methyl mercury: An application of a single compartment model to single-strand hair analysis  

Science Conference Proceedings (OSTI)

A new method of estimating fetal exposure is used in a dose-response analysis of data from the 1971 outbreak of methyl mercury poisoning in rural Iraq. An X-ray fluorescence instrument for the measurement of single strands of human hair was employed to obtain longitudinal profiles recapitulating fetal exposure. Logit and hockey-stick models as well as nonparametric smoothing are used to describe data on delayed development and central nervous system abnormality.

Cox, C.; Clarkson, T.W.; Marsh, D.O.; Amin-Zaki, L.; Tikriti, S.; Myers, G.G. (Univ. of Rochester School of Medicine, New York, NY (USA))

1989-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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.


141

Formation of methyl ester of 2-methylglyceric acid from thymine glycol residues: a convenient new method for determining radiation damage to DNA  

Science Conference Proceedings (OSTI)

Thymine glycol residues in DNA or thymidine were converted to methyl 2-methylglycerate by reaction with alkaline borohydride followed by methanolic HCl. The product was labeled either from (/sup 3/H)DNA or from (/sup 3/H)borohydride and was followed by cochromatography with authentic /sup 14/C-labeled material. Following acid hydrolysis, the identity of 2-methylglyceric acid was confirmed by high-resolution mass spectrometry, NMR, IR, and elemental analysis. Treatment of DNA or thymidine with X-irradiation, with H/sub 2/O/sub 2/ and Fe/sup 2 +/, with H/sub 2/O/sub 2/, Cu/sup 2 +/, and ascorbate, and with H/sub 2/O/sub 2/ and ultraviolet light, permanganate, or sonication all produced methyl 2-methylglycerate in varying amounts after alkaline borohydride and methanolic HCl, whereas untreated DNA did not. The data indicate that certain oxidants including hydroxyl radicals generated by chemical means or from radiolysis of water convert thymine residues to thymine glycols in DNA, which can be determined as methyl 2-methylglycerate.

Schellenberg, K.A.; Shaeffer, J.

1986-04-08T23:59:59.000Z

142

Accurate and Reliable Quantification of Total Microalgal Fuel Potential as Fatty Acid Methyl Esters by in situ Transesterfication  

DOE Green Energy (OSTI)

In the context of algal biofuels, lipids, or better aliphatic chains of the fatty acids, are perhaps the most important constituents of algal biomass. Accurate quantification of lipids and their respective fuel yield is crucial for comparison of algal strains and growth conditions and for process monitoring. As an alternative to traditional solvent-based lipid extraction procedures, we have developed a robust whole-biomass in situ transesterification procedure for quantification of algal lipids (as fatty acid methyl esters, FAMEs) that (a) can be carried out on a small scale (using 4-7 mg of biomass), (b) is applicable to a range of different species, (c) consists of a single-step reaction, (d) is robust over a range of different temperature and time combinations, and (e) tolerant to at least 50% water in the biomass. Unlike gravimetric lipid quantification, which can over- or underestimate the lipid content, whole biomass transesterification reflects the true potential fuel yield of algal biomass. We report here on the comparison of the yield of FAMEs by using different catalysts and catalyst combinations, with the acid catalyst HCl providing a consistently high level of conversion of fatty acids with a precision of 1.9% relative standard deviation. We investigate the influence of reaction time, temperature, and biomass water content on the measured FAME content and profile for 4 different samples of algae (replete and deplete Chlorella vulgaris, replete Phaeodactylum tricornutum, and replete Nannochloropsis sp.). We conclude by demonstrating a full mass balance closure of all fatty acids around a traditional lipid extraction process.

Laurens, L. M. L.; Quinn, M.; Van Wychen, S.; Templeton, D. W.; Wolfrum, E. J.

2012-04-01T23:59:59.000Z

143

Acid-base properties, deactivation, and in situ regeneration of condensation catalysts for synthesis of methyl methacrylate  

SciTech Connect

Condensation reaction of a propionate with formaldehyde is a novel route for synthesis of methyl methacrylate (MMA). The reaction mechanism involves a proton abstraction from the propionate on the basic sites and activation of the aliphatic aldehyde on the acidic sites of the catalyst. The acid-base properties of ternary V-Si-P oxide catalysts and their relation to the NWA yield in the vapor phase condensation of formaldehyde with propionic anhydride has been studied for the first time. Five different V-Si-P catalysts with different atomic ratios of vanadium, silicon, and phosphorous were synthesized, characterized, and tested in a fixed-bed microreactor system. A V-Si-P 1:10:2.8 catalyst gave the maximum condensation yield of 56% based on HCHO fed at 300{degrees}C and 2 atm and at a space velocity of 290 cc/g cat{center_dot}h. A parameter called the ``q-ratio`` has been defined to correlate the condensation yields to the acid-base properties. The correlation of q-ratio with the condensation yield shows that higher q-ratios are more desirable. The long-term deactivation studies on the V-Si-P 1: 10:2.8 catalyst at 300{degrees}C and 2 atm and at a space velocity of 290 cc/g cat{center_dot}h show that the catalyst activity drops by a factor of nearly 20 over a 180 h period. The activity can be restored to about 78% of the initial activity by a mild oxidative regeneration at 300{degrees}C and 2 atm. The performance of V-Si-P catalyst has been compared to a Ta/SiO{sub 2} catalyst. The Ta- catalyst is more stable and has a higher on-stream catalyst life.

Gogate, M.R.; Spivey, J.J. [Reseach Triangle Institute, Research Triangle Institute, Research Triangle Park, NC (United States); Zoeller, J.R. [Eastman Chemical Co., Kingsport, TN (United States)

1996-12-31T23:59:59.000Z

144

INSIGHTS INTO SURFACE HYDROGENATION IN THE INTERSTELLAR MEDIUM: OBSERVATIONS OF METHANIMINE AND METHYL AMINE IN Sgr B2(N)  

SciTech Connect

Multiple observations of methanimine (CH{sub 2}NH) and methyl amine (CH{sub 3}NH{sub 2}) have been performed toward Sgr B2(N) at 1, 2, and 3 mm using the Submillimeter Telescope and the 12 m antenna of the Arizona Radio Observatory. In the frequency range 68-280 GHz, 23 transitions of CH{sub 2}NH and 170 lines of CH{sub 3}NH{sub 2} have been observed as individual, distinguishable features, although some are partially blended with other lines. For CH{sub 2}NH, the line profiles indicate V{sub LSR} = 64.2 {+-} 1.4 km s{sup -1} and {Delta}V{sub 1/2} = 13.8 {+-} 2.8 km s{sup -1}, while V{sub LSR} = 63.7 {+-} 1.6 km s{sup -1} and {Delta}V{sub 1/2} = 15.1 {+-} 3.0 km s{sup -1} for CH{sub 3}NH{sub 2}, parameters that are very similar to those of other organic species in Sgr B2(N). From these data, rotational diagrams were constructed for both species. In the case of CH{sub 2}NH, a rotational temperature of T{sub rot} = 44 {+-} 13 K and a column density of N{sub tot} = (9.1 {+-} 4.4) Multiplication-Sign 10{sup 14} cm{sup -2} were determined from the analysis. For CH{sub 3}NH{sub 2}, T{sub rot} = 159 {+-} 30 K and N{sub tot} = (5.0 {+-} 0.9) Multiplication-Sign 10{sup 15} cm{sup -2}, indicating that this species is present in much warmer gas than CH{sub 2}NH. The fractional abundances for CH{sub 2}NH and CH{sub 3}NH{sub 2} were established to be f (H{sub 2}) Almost-Equal-To 3.0 Multiplication-Sign 10{sup -10} and f (H{sub 2}) Almost-Equal-To 1.7 Multiplication-Sign 10{sup -9}, respectively. It has been proposed that CH{sub 2}NH is formed on grains via hydrogenation of HCN; further hydrogenation of CH{sub 2}NH on surfaces leads to CH{sub 3}NH{sub 2}. However, given the dissimilarity between the rotational temperatures and distributions of CH{sub 2}NH and CH{sub 3}NH{sub 2} in Sgr B2, it is improbable that these species are closely related synthetically, at least in this source. Both CH{sub 2}NH and CH{sub 3}NH{sub 2} are more likely created by neutral-neutral processes in the gas phase.

Halfen, D. T.; Ziurys, L. M. [Departments of Chemistry and Astronomy, Arizona Radio Observatory and Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States)] [Departments of Chemistry and Astronomy, Arizona Radio Observatory and Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States); Ilyushin, V. V., E-mail: halfendt@as.arizona.edu, E-mail: lziurys@as.arizona.edu [Institute of Radio Astronomy of the National Academy of Sciences Ukraine, Chervonopraporna 4, 61002 Kharkov (Ukraine)

2013-04-10T23:59:59.000Z

145

Discovery of 5-[[4-[(2,3-Dimethyl-2H-indazol-6-yl)methylamino]-2-pyrimidinyl]amino]-2-methyl-benzenesulfonamide (Pazopanib), a Novel and Potent Vascular Endothelial Growth Factor Receptor Inhibitor  

Science Conference Proceedings (OSTI)

Inhibition of the vascular endothelial growth factor (VEGF) signaling pathway has emerged as one of the most promising new approaches for cancer therapy. We describe herein the key steps starting from an initial screening hit leading to the discovery of pazopanib, N{sup 4}-(2,3-dimethyl-2H-indazol-6-yl)-N{sup 4}-methyl-N{sup 2}-(4-methyl-3-sulfonamidophenyl)-2,4-pyrimidinediamine, a potent pan-VEGF receptor (VEGFR) inhibitor under clinical development for renal-cell cancer and other solid tumors.

Harris, Philip A.; Boloor, Amogh; Cheung, Mui; Kumar, Rakesh; Crosby, Renae M.; Davis-Ward, Ronda G.; Epperly, Andrea H.; Hinkle, Kevin W.; Hunter, III, Robert N.; Johnson, Jennifer H.; Knick, Victoria B.; Laudeman, Christopher P.; Luttrell, Deirdre K.; Mook, Robert A.; Nolte, Robert T.; Rudolph, Sharon K.; Szewczyk, Jerzy R.; Truesdale, Anne T.; Veal, James M.; Wang, Liping; Stafford, Jeffrey A. (GSKNC)

2009-05-18T23:59:59.000Z

146

The Influence of the Linker Geometry in Bis(3-hydroxy-N-methyl-pyridin-2-one) Ligands on Solution-Phase Uranyl Affinity  

SciTech Connect

Seven water-soluble, tetradentate bis(3-hydroxy-N-methyl-pyridin-2-one) (bis-Me-3,2-HOPO) ligands were synthesized that vary only in linker geometry and rigidity. Solution phase thermodynamic measurements were conducted between pH 1.6 and pH 9.0 to determine the effects of these variations on proton and uranyl cation affinity. Proton affinity decreases by introduction of the solubilizing triethylene glycol group as compared to un-substituted reference ligands. Uranyl affinity was found to follow no discernable trends with incremental geometric modification. The butyl-linked 4Li-Me-3,2-HOPO ligand exhibited the highest uranyl affinity, consistent with prior in vivo decorporation results. Of the rigidly-linked ligands, the o-phenylene linker imparted the best uranyl affinity to the bis-Me-3,2-HOPO ligand platform.

Szigethy, Geza; Raymond, Kenneth

2010-08-12T23:59:59.000Z

147

Mathematical simulation and X-ray diffraction investigation of the crystal structure of 1-phenyl-1-tert-butyl-3-methyl-1,3-dihydroisobenzofuran  

SciTech Connect

An algorithm for using a priori generation of crystal structures by the discrete modeling method for the interpretation of data obtained from single-crystal X-ray diffraction experiments is considered. The crystal structure of 1-phenyl-1-tert-butyl-3-methyl-1,3-dihydroisobenzofuran is mathematically simulated using the discrete modeling of molecular packings and studied by X-ray diffraction. The simulation is performed for two isomers of the initial chemical compound that are possible from the viewpoint of the mechanism of the chemical reaction used in the synthesis of this compound. Appropriate models that can serve as starting models for solving and refining the crystal structure with the use of X-ray diffraction data are chosen from a complete set of calculated structural models in accordance with specific criteria. The structure is solved using a starting model calculated using the discrete modeling method and refined by the full-matrix least-squares procedure.

Maleev, A. V., E-mail: andr_mal@mail.ru; Zhitkov, I. K.; Potekhin, K. A. [Vladimir State Pedagogical University (Russian Federation)

2008-07-15T23:59:59.000Z

148

Methyl Vitamin B12 but not methylfolate rescues a motor neuron-like cell line from homocysteine-mediated cell death  

SciTech Connect

Homocysteine is an excitatory amino acid implicated in multiple diseases including amyotrophic lateral sclerosis (ALS). Information on the toxicity of homocysteine in motor neurons is limited and few studies have examined how this toxicity can be modulated. In NSC-34D cells (a hybrid cell line derived from motor neuron-neuroblastoma), homocysteine induces apoptotic cell death in the millimolar range with a TC{sub 50} (toxic concentration at which 50% of maximal cell death is achieved) of 2.2 mM, confirmed by activation of caspase 3/7. Induction of apoptosis was independent of short-term reactive oxygen species (ROS) generation. Methyl Vitamin B12 (MeCbl) and methyl tetrahydrofolate (MTHF), used clinically to treat elevated homocysteine levels, were tested for their ability to reverse homocysteine-mediated motor neuron cell death. MeCbl in the micromolar range was able to provide neuroprotection (2 h pretreatment prior to homocysteine) and neurorescue (simultaneous exposure with homocysteine) against millimolar homocysteine with an IC{sub 50} (concentration at which 50% of maximal cell death is inhibited) of 0.6 {mu}M and 0.4 {mu}M, respectively. In contrast, MTHF (up to 10 {mu}M) had no effect on homocysteine-mediated cell death. MeCbl inhibited caspase 3/7 activation by homocysteine in a time- and dose-dependent manner, whereas MTHF had no effect. We conclude that MeCbl is effective against homocysteine-induced cell death in motor neurons in a ROS-independent manner, via a reduction in caspase activation and apoptosis. MeCbl decreases Hcy induced motor neuron death in vitro in a hybrid cell line derived from motor neuron-neuroblastoma and may play a role in the treatment of late stage ALS where HCy levels are increased in animal models of ALS.

Hemendinger, Richelle A., E-mail: richelle.hemendinger@carolinashealthcare.org; Armstrong, Edward J.; Brooks, Benjamin Rix

2011-03-15T23:59:59.000Z

149

Notices  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

240 Federal Register 240 Federal Register / Vol. 76, No. 98 / Friday, May 20, 2011 / Notices amendment of methyl bromide products that include the non-CUE/QPS use on fresh market tomatoes (CA), fresh market peppers (CA), Vidalia onions (GA), and ginger (HI) is December 31, 2012. The effective date of the amendment of methyl bromide products that includes the non-CUE/QPS use for resurfacing/replanting turf and sod on golf courses and athletic/recreational fields is December 31, 2013. The effective date of the amendment of methyl bromide products that include the non-CUE/QPS use on caneberry or tobacco seedling tray uses is December 31, 2014. The effective date of the amendment listed in Table 1B is May 20, 2011. These amendments do not affect post-harvest fumigant uses of

150

Notices  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

240 Federal Register 240 Federal Register / Vol. 76, No. 98 / Friday, May 20, 2011 / Notices amendment of methyl bromide products that include the non-CUE/QPS use on fresh market tomatoes (CA), fresh market peppers (CA), Vidalia onions (GA), and ginger (HI) is December 31, 2012. The effective date of the amendment of methyl bromide products that includes the non-CUE/QPS use for resurfacing/replanting turf and sod on golf courses and athletic/recreational fields is December 31, 2013. The effective date of the amendment of methyl bromide products that include the non-CUE/QPS use on caneberry or tobacco seedling tray uses is December 31, 2014. The effective date of the amendment listed in Table 1B is May 20, 2011. These amendments do not affect post-harvest fumigant uses of

151

Comparative aromatic hydroxylation and N-demethylation of MPTP neurotoxin and its analogs, N-methylated {beta}-carboline and isoquinoline alkaloids, by human cytochrome P450 2D6  

Science Conference Proceedings (OSTI)

1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) neurotoxin is a chemical inducer of Parkinson's disease (PD) whereas N-methylated {beta}-carbolines and isoquinolines are naturally occurring analogues of MPTP involved in PD. This research has studied the oxidation of MPTP by human CYP2D6 (CYP2D6*1 and CYP2D6*10 allelic variants) as well as by a mixture of cytochrome P450s-resembling HLM, and the products generated compared with those afforded by human monoamine oxidase (MAO-B). MPTP was efficiently oxidized by CYP2D6 to two main products: MPTP-OH (p-hydroxylation) and PTP (N-demethylation), with turnover numbers of 10.09 min{sup -1} and K {sub m} of 79.36 {+-} 3 {mu}M (formation of MPTP-OH) and 18.95 min{sup -1} and K {sub m} 69.6 {+-} 2.2 {mu}M (PTP). Small amounts of dehydrogenated toxins MPDP{sup +} and MPP{sup +} were also detected. CYP2D6 competed with MAO-B for the oxidation of MPTP. MPTP oxidation by MAO-B to MPDP{sup +} and MPP{sup +} toxins (bioactivation) was up to 3-fold higher than CYP2D6 detoxification to PTP and MPTP-OH. Several N-methylated {beta}-carbolines and isoquinolines were screened for N-demethylation (detoxification) that was not significantly catalyzed by CYP2D6 or the P450s mixture. In contrast, various {beta}-carbolines were efficiently hydroxylated to hydroxy-{beta}-carbolines by CYP2D6. Thus, N(2)-methyl-1,2,3,4-tetrahydro-{beta}-carboline (a close MPTP analog) was highly hydroxylated to 6-hydroxy-N(2)-methyl-1,2,3,4-tetrahydro-{beta}-carboline and a corresponding 7-hydroxy-derivative. Thus, CYP2D6 could participate in the bioactivation and/or detoxification of these neuroactive compounds by an active hydroxylation pathway. The CYP2D6*1 enzymatic variant exhibited much higher metabolism of both MPTP and N(2)-methyl-1,2,3,4-tetrahydro-{beta}-carboline than the CYP2D6*10 variant, highlighting the importance of CYP2D6 polymorphism in the oxidation of these toxins. Altogether, these results suggest that CYP2D6 can play an important role in the metabolic outcome of both MPTP and {beta}-carbolines.

Herraiz, Tomas [Spanish Council for Scientific Research. CSIC. Instituto de Fermentaciones Industriales, Juan de la Cierva 3, 28006, Madrid (Spain)]. E-mail: therraiz@ifi.csic.es; Guillen, Hugo [Spanish Council for Scientific Research. CSIC. Instituto de Fermentaciones Industriales, Juan de la Cierva 3, 28006, Madrid (Spain); Aran, Vicente J. [Spanish Council for Scientific Research. CSIC. Instituto de Quimica Medica. Juan de la Cierva 3, 28006. Madrid (Spain); Idle, Jeffrey R. [Institute of Pharmacology, 1st Faculty of Medicine Charles University. Albertov 4, 128 00 Prague 2 (Czech Republic); Gonzalez, Frank J. [Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892 (United States)

2006-11-01T23:59:59.000Z

152

The Influence of Linker Geometry on Uranyl Complexation by Rigidly-Linked Bis(3-hydroxy-N-methyl-pyridin-2-one)  

DOE Green Energy (OSTI)

A series of bis(3-hydroxy-N-methyl-pyridin-2-one) ligands was synthesized, and their respective uranyl complexes were characterized by single crystal X-ray diffraction analyses. These structures were inspected for high-energy conformations and evaluated using a series of metrics to measure co-planarity of chelating moieties with each other and the uranyl coordination plane, as well as to measure coordinative crowding about the uranyl dication. Both very short (ethyl, 3,4-thiophene and o-phenylene) and very long ({alpha},{alpha}{prime}-m-xylene and 1,8-fluorene) linkers provide optimal ligand geometries about the uranyl cation, resulting in planar, unstrained molecular arrangements. The planarity of the rigid linkers also suggests there is a degree of pre-organization for a planar coordination mode that is ideal for uranyl-selective ligand design. Comparison of intramolecular N{sub amide}-O{sub phenolate} distances and {sup 1}H NMR chemical shifts of amide protons supports earlier results that short linkers provide the optimal geometry for intramolecular hydrogen bonding.

Szigethy, Geza; Raymond, Kenneth

2010-04-22T23:59:59.000Z

153

Pharmacology, pharmacokinetics and metabolism of the dopamine receptor agonist 5-hydroxy-6-methyl-2-di-n-propylaminotetralin (DK-118) in the cat  

SciTech Connect

The dopamine receptor agonist 5-hydroxy-6-methyl-2-di-n-propylaminotetralin (DK-118) lowers blood pressure, heart rat and inhibits tachycardia induced in cats by electrical stimulation of sympathetic nerves innervating the heart. DK-118, unlike most of its chemically related dopaminergic analogs, exhibits a slow onset of activity suggesting that one or more metabolites of the drug may be responsible for its pharmacologic effects. The purpose of the work described in this thesis was to gain information regarding the possible bioactivation of DK-118 in cats. In one series of experiments, cats were pretreated with inhibitors of drug metabolism, metyrapone or SKF 525-A, and alterations of the pharmacologic effects of DK-118 determined. A high-performance liquid chromatography assay-using electrochemical detection was developed to quantify urine and plasma concentrations of DK-118 in control, metyrapone pretreated and SKF 525-A pretreated cats. Urinary metabolites of (/sup 14/C)DK-118 were identified employing HPLC, GC/MS and FAB/MS. Pharmacologic activity and receptor binding of selected metabolites were determined. Data presented in this thesis are consistent with the hypothesis that metabolites contribute to some of the pharmacologic effects of DK-118.

Koons, J.C.

1985-01-01T23:59:59.000Z

154

Synthesis and Coordination Properties of Trifluoromethyl Decorated Derivatives of 2,6-Bis[(diphenylphosphinoyl)methyl]pyridine N-Oxide Ligands with Lanthanide Ions  

Science Conference Proceedings (OSTI)

Phosphinoyl Grignard-based substitutions on 2,6-bis(chloromethyl)pyridine followed by N-oxidation of the intermediate 2,6-bis(phosphinoyl)methyl pyridine compounds with mCPBA give the target trifunctional ligands 2,6-bis[bis-(2-trifluoromethyl-phenyl)-phosphinoylmethyl]-pyridine 1-oxide (2a) and 2,6-bis[bis-(3,5-bis-trifluoromethyl-phenyl)-phosphinoylmethyl]-pyridine 1-oxide (2b) in high yields. The ligands have been spectroscopically characterized, the molecular structures confirmed by single crystal X-ray diffraction methods and the coordination chemistry surveyed with lanthanide nitrates. Single crystal X-ray diffraction analyses are described for the coordination complexes Nd(2a)(NO3)3, Nd(2a)(NO3)3 (CH3CN)0.5, Eu(2a)(NO3)3 and Nd(2b)(NO3)3 (H2O)1.25; in each case the ligand binds in a tridentate mode to the Ln(III) cation. These structures are compared with the structures found for lanthanide coordination complexes of the parent NOPOPO ligand, [Ph2P(O)CH2]2C5H3NO.

Pailloux, Sylvie [University of New Mexico, Albuquerque; Shirima, Cornel Edicome [University of New Mexico, Albuquerque; Ray, Alicia D. [University of New Mexico, Albuquerque; Duesler, Eileen N. [University of New Mexico, Albuquerque; Paine, Robert T. [University of New Mexico, Albuquerque; Klaehn, John D. [Idaho National Laboratory (INL); McIlwain, Michael E [Idaho National Laboratory (INL); Hay, Benjamin [ORNL

2009-01-01T23:59:59.000Z

155

Proc. Natl. Acad. Sci. USA Vol. 96, pp. 1000610009, August 1999  

E-Print Network (OSTI)

has industrial sources (primarily natural gas leaks of thermogenic origin), as well as a number of methyl bromide (CH3Br), an ozone-depleting gas, is highly uncertain, because it has complex sources. This result suggests that industrial CH3Br is isotopically distinct and that the carbon isotopic composition

Goldstein, Allen

156

Continuous Flow Oxidation of Alcohols and Aldehydes Utilizing Bleach and Catalytic Tetrabutylammonium Bromide  

E-Print Network (OSTI)

We report a method for the oxidation of a range of alcohols and aldehydes utilizing a simple flow system of alcohols in EtOAc with a stream of 12.5% NaOCl and catalytic Bu[subscript 4]NBr. Secondary alcohols are oxidized ...

Leduc, Andrew B.

157

A COMPARISON OF THE PHARMACOLOGICAL EFFECTS OF SOME COMPOUNDS RELATED TO 2- AMINOETHYLISOTHIURONIUM BROMIDE HYDROBROMIDE (AET)  

SciTech Connect

The pharmacological properties of nine compounds formed by substitutions either in the AET or in the APT molecule were studied in cats. None of the compounds elicited the chemoreflex characteristic of the parent compounds. In general, substitutions in the APT and AET molecules attenuated gut responses, amplified ganglionic block, ing activity (particularly in AET analogs), and resulted in compounds with some degree of neuromuscular depressant activity. (auth)

DiStefano, V.; Korn, P.S.; Leary, D.E.

1963-02-01T23:59:59.000Z

158

Simulation of the output power of copper bromide lasers by the MARS method  

SciTech Connect

The dependence of the output power of CuBr lasers (operating at wavelengths of 510.6 and 578.2 nm) on ten input physical parameters has been statistically analysed based on a large amount of experimental data accumulated for these lasers. Regression models have been built using the flexible nonparametric method of multivariate adaptive regression splines (MARS) to describe both linear and nonlinear local dependences. These models cover more than 97% initial data with an error comparable with the experimental error; they are applied to estimate and predict the output powers of both existing and future lasers. The advantage of the models constructed for estimating laser parameters over the standard parametric methods of multivariate factor and regression analysis is demonstrated.

Iliev, I P; Voynikova, D S; Gocheva-Ilieva, S G

2012-04-30T23:59:59.000Z

159

Characterization of Thallium Bromide (TlBr) for Room Temperature Radiation Detectors  

E-Print Network (OSTI)

1.1 Motivation: Radiation Detection for HomelandSecurity . . . . . . . . . . 1.2 Semiconductor Radiationand related features of radiation ionization energies in

Smith, Holland McTyeire

2013-01-01T23:59:59.000Z

160

Development and proof-testing of advanced absorption refrigeration cycle concepts, Phase 2  

SciTech Connect

This paper summarizes the results of the work performed to date under Phase II of the DOE program. The Phase II objective is to design, fabricate, and proof-test a natural gas-fired absorption heat pump (AHP) with an efficiency level substantially higher than present day state-of-the-art equipment. To achieve these objectives, Carrier investigated the performance of the candidate Phase I fluids (lithium bromide:zinc bromide/methyl alcohol-MEOH or lithium bromide:water methylmine-MMA) as well as high concentration formulations of the conventional LiBr/H2O mixture for high temperature, upper loop use. These results were compared with several existing fluid candidates including ammonia/water. 9 figs.

Reimann, R.C.; Melikian, G.

1988-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" from the National Library of EnergyBeta (NLEBeta).
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161

The Dependence of Donor:Acceptor Ratio on the Photovoltaic Performances of Blended poly (3-octylthiophene-2,5-diyl) and (6,6)-phenyl C{sub 71} butyric acid methyl ester Bulk Heterojunction Organic Solar Cells  

Science Conference Proceedings (OSTI)

Bulk heterojunction organic solar cells using blended poly (3-octylthiophene-2,5-diyl)(P3OT) and (6,6)-phenyl C{sub 71} butyric acid methyl ester (PC{sub 71}BM) have been fabricated. P3OT and PC{sub 71}BM were used as the electron donor (D) and acceptor (A), respectively. Both materials were mixed and dissolved in dichlorobenzene with three different D:A ratios i.e. 1:3, 1:1 and 3:1 (weight) while maintained at the concentration of 2 wt%(26 mg/ml). The blended thin films were sandwiched between the indium tin oxide (ITO) coated glass and the aluminum film. This paper reports the influence of donor:acceptor ratio on the performance of solar cell devices measured by current-voltage measurement both in the dark and under 1.5 AM solar illumination. It was found that all devices showed the photovoltaic effect with poor diode behavior and the donor:acceptor ratio significantly influenced on the performance of bulk heterojunction organic solar cells.

Fauzia, Vivi [Department of Physics, Faculty of Mathematics and Natural Sciences, University of Indonesia, Kampus UI Depok, Depok 16424 (Indonesia); Institute of Microengineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor (Malaysia); Umar, Akrajas Ali; Salleh, Muhamad Mat [Institute of Microengineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor (Malaysia); Yahya, Muhammad [School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor (Malaysia)

2010-10-24T23:59:59.000Z

162

Integrate Experiments and Models to Estimate Exposure - (1) Building  

NLE Websites -- All DOE Office Websites (Extended Search)

Integrate Experiments and Models to Estimate Exposure - (1) Building Integrate Experiments and Models to Estimate Exposure - (1) Building Fumigation and (2) Elemental Mercury Spill Speaker(s): Wanyu Chan Date: February 22, 2010 - 12:00pm Location: 90-3075 Seminar Host/Point of Contact: Michael Sohn Models that predict exposure concentrations in the indoor and outdoor air can be improved by experiments designed to validate or calibrate the models. This presentation will showcase two examples where experiments and models are integrated to estimate exposure concentrations. One example is the use of methyl bromide as fumigant at food processing facilities. Field studies were conducted at three mill sites that are representative of typical industry practices in terms of size, operation, and fumigation protocol. Concentrations of methyl bromide inside the mills and outdoors

163

Reactive formulations for a neutralization of toxic industrial chemicals  

DOE Patents (OSTI)

Decontamination formulations for neutralization of toxic industrial chemicals, and methods of making and using same. The formulations are effective for neutralizing malathion, hydrogen cyanide, sodium cyanide, butyl isocyanate, carbon disulfide, phosgene gas, capsaicin in commercial pepper spray, chlorine gas, anhydrous ammonia gas; and may be effective at neutralizing hydrogen sulfide, sulfur dioxide, formaldehyde, ethylene oxide, methyl bromide, boron trichloride, fluorine, tetraethyl pyrophosphate, phosphorous trichloride, arsine, and tungsten hexafluoride.

Tucker, Mark D. (Albuqueruqe, NM); Betty, Rita G. (Rio Rancho, NM)

2006-10-24T23:59:59.000Z

164

Available Technologies: Bacterial Overproduction of Methyl Ketones ...  

u.s. department of energy • office of science • university of california. contact webmaster • comments • policy /privacy/security ...

165

Identifiable mercury methylation genes and enzymes ...  

be limited or unavailable. Patent applications directed towards this invention may not have been filed with any patent ... Disclosure Number 201202869 ...

166

Phytoremediation of Ionic and Methyl Mercury P  

DOE Green Energy (OSTI)

Our long-term goal is to enable highly productive plant species to extract, resist, detoxify, and/or sequester toxic heavy metal pollutants as an environmentally friendly alternative to physical remediation methods. We have focused this phytoremediation research on soil and water-borne ionic and methylmercury. Mercury pollution is a serious world-wide problem affecting the health of human and wild-life populations. Methylmercury, produced by native bacteria at mercury-contaminated wetland sites, is a particularly serious problem due to its extreme toxicity and efficient biomagnification in the food chain. We engineered several plant species (e.g., Arabidopsis, tobacco, canola, yellow poplar, rice) to express the bacterial genes, merB and/or merA, under the control of plant regulatory sequences. These transgenic plants acquired remarkable properties for mercury remediation. (1) Transgenic plants expressing merB (organomercury lyase) extract methylmercury from their growth substrate and degrade it to less toxic ionic mercury. They grow on concentrations of methylmercury that kill normal plants and accumulate low levels of ionic mercury. (2) Transgenic plants expressing merA (mercuric ion reductase) extract and electrochemically reduce toxic, reactive ionic mercury to much less toxic and volatile metallic mercury. This metal transformation is driven by the powerful photosynthetic reducing capacity of higher plants that generates excess NADPH using solar energy. MerA plants grow vigorously on levels of ionic mercury that kill control plants. Plants expressing both merB and merA degrade high levels of methylmercury and volatilize metallic mercury. These properties were shown to be genetically stable for several generations in the two plant species examined. Our work demonstrates that native trees, shrubs, and grasses can be engineered to remediate the most abundant toxic mercury pollutants. Building on these data our working hypothesis for the next grant period is that transgenic plants expressing the bacterial merB and merA genes will (a) remove mercury from polluted soil and water and (b) prevent methylmercury from entering the food chain. Our specific aims center on understanding the mechanisms by which plants process the various forms of mercury and volatilize or transpire mercury vapor. This information will allow us to improve the design of our current phytoremediation strategies. As an alternative to volatilizing mercury, we are using several new genes to construct plants that will hyperaccumulate mercury in above-ground tissues for later harvest. The Department of Energy's Oak Ridge National Laboratory and Brookhaven National Laboratory have sites with significant levels of mercury contamination that could be cleaned by applying the scientific discoveries and new phytoremediation technologies described in this proposal. The knowledge and expertise gained by engineering plants to hyperaccumulate mercury can be applied to the remediation of other heavy metals pollutants (e.g., arsenic, cesium, cadmium, chromium, lead, strontium, technetium, uranium) found at several DOE facilities.

Meagher, Richard B.

1999-06-01T23:59:59.000Z

167

Inter- and intracellular dynamics of DNA methylation  

E-Print Network (OSTI)

A. Spadola, E. Yuan, J. Kosek, L. Jiang, E. Hod, K. Li, V.A. Spadola, E. Yuan, J. Kosek, L. Jiang, E. Hod, K. Li, V.

Shoemaker, Robert Field

2010-01-01T23:59:59.000Z

168

DNA methylation in early mammalian development  

E-Print Network (OSTI)

All the cells in the body contain the same genome yet showcase drastically different phenotypes. This is the result of different transcriptional programs, which are partly controlled by epigenetic modifications, including ...

Chan, Michelle M. (Michelle Mei Wah)

2013-01-01T23:59:59.000Z

169

Phytogenic biosynthesis and emission of methyl acetate  

passing room air through a series of three high-purity hydro-carbon traps (Restek Inc., Bellefonte, PA, USA). ... Environmental Research of the U.S. Department of Energy

170

Determination of Methyl tert-Butyl Ether and tert-Butyl Alcohol in Water by Solid-Phase Microextraction/Head Space Analysis in Comparison to EPA Method 5030/8260B  

DOE Green Energy (OSTI)

Methyl tert-butyl ether (MTBE) is now one of the most common groundwater contaminants in the United States. Groundwater contaminated with MTBE is also likely to be contaminated with tert-butyl alcohol (TBA), because TBA is a component of commercial grade MTBE, TBA can also be used as a fuel oxygenate, and TBA is a biodegradation product of MTBE. In California, MTBE is subject to reporting at concentrations greater than 3 {micro}g/L. TBA is classified as a ''contaminant of current interest'' and has a drinking water action level of 12 {micro}g/L. In this paper, we describe the development and optimization of a simple, automated solid phase microextraction (SPME) method for the analysis of MTBE and TBA in water and demonstrate the applicability of this method for monitoring MTBE and TBA contamination in groundwater, drinking water, and surface water. In this method, the headspace (HS) of a water sample is extracted with a carboxen/polydimethylsiloxane SPME fiber, the MTBE and TBA are desorbed into a gas chromatograph (GC), and detected using mass spectrometry (MS). The method is optimized for the routine analysis of MTBE and TBA with a level of quantitation of 0.3 {micro}g/L and 4 {micro}g/L, respectively, in water. MTBE quantitation was linear for over two orders of concentration (0.3 {micro}g/L -80 {micro}g/L). TBA was found to be linear within the range of 4 {micro}g/L-7,900 {micro}g/L. The lower level of detection for MTBE is 0.03 {micro}g/L using this method. This SPME method using headspace extraction was found to be advantageous over SPME methods requiring immersion of the fiber into the water samples, because it prolonged the life of the fiber by up to 400 sample analyses. This is the first time headspace extraction SPME has been shown to be applicable to the measurement of both MTBE and TBA at concentrations below regulatory action levels. This method was compared with the certified EPA Method 5030/8260B (purge-and-trap/GC/MS) using split samples from laboratory bioreactors treating MTBE contaminated water and applied to environmental samples collected throughout the East Bay area of California. Results from the SPME-HS/GC/MS method were directly comparable to the EPA Method 5030/8260B. This method provides an simple, inexpensive, accurate, and sensitive alternative to EPA Method 5030/8260B for the analysis of MTBE and TBA in water samples.

Oh, Keun-Chan; Stringfellow, William T.

2003-10-02T23:59:59.000Z

171

Atmospheric Measurements of Climate-Relevant Species  

NLE Websites -- All DOE Office Websites (Extended Search)

Atmospheric Measurements of Climate-Relevant Species Atmospheric Measurements of Climate-Relevant Species CDIAC's data collection includes measurements of the following climate-relevant chemical species. A summary of recent greenhouse gas concentrations is also available. To determine how compounds are named, see the CDIAC "Name that compound" page. Butane (C4H10) Carbon Dioxide (CO2) Carbon Isotopes Carbon Monoxide (CO) Carbon Tetrachloride (CCl4) Chlorofluorocarbons Chloroform (CHCl3) Deuterium (2H) Ethane (C2H6) Ethyl Nitrate (C2H5ONO2) Ethyne (C2H2) Fluoroform (CHF3) Halogenated Compounds (modern records) Halons (fluorocarbons) Hydrogen (H2) Hydrochlorofluorocarbons (HCFCs) Hydrofluorocarbons (HFCs) i-Propyl Nitrate (C3H7ONO2) Methane (CH4) Methyl Bromide (CH3Br) Methyl Chloride (CH3Cl) Methyl Chloroform (CH3CCl3)

172

DNA methylation age of human tissues and cell types  

E-Print Network (OSTI)

adipose) tissue from [72]. Data set 61 consists of humanheart tissue from [27]. Data set 62 consists of kidney (tissue from TCGA (KIRC). Data set 63 consists of liver (

Horvath, Steve

2013-01-01T23:59:59.000Z

173

Refinery & Blenders Net Input of Methyl Tertiary Butyl Ether ...  

U.S. Energy Information Administration (EIA)

-No Data Reported; --= Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. Notes: RBOB with Ether, RBOB ...

174

Small RNAs, DNA methylation and transposable elements in wheat  

E-Print Network (OSTI)

reinhardtii by a DEAH-Box RNA helicase. Science 2000, 290:homolog of Werner syndrome helicase and RNaseD. Cell 1999,

2010-01-01T23:59:59.000Z

175

A-61: Poly Methyl Methacrylate-Halloysite Composite Nanofibers ...  

Science Conference Proceedings (OSTI)

... as Shielding Materials for Electromagnetic Interference and Radiation Shielding ... for Nuclear Power Plant Steam Generators during Cold-Working Process.

176

Ultrastructural changes in rat hepatocytes following acute methyl mercury intoxication  

SciTech Connect

Male rats were given daily subcutaneous injections of methylmercuric chloride (CH/sub 3/HgCl) at a dosage of 10 mg/kg body weight for 4 days. The earliest ultrastructural changes consisted of dilatation of the rough endoplasmic reticulum, wavy transformation of the mitochondrial membranes and occasional accumulation of liposomes. Focal areas of cytoplasmic degradation were observed 1 day after the initial administration of mercury. An increased number of lysosomes as well as swelling and floccular degeneration of the mitochondria were frequently observed at 2 days. Sequestration of cytoplasmic organelles within the hepatocytes, extrusion of degenerated hepatic organelles and cytoplasmic debris into the sinusoid could be observed 24 hours after the initial mercury administration and became a frequent finding after 4 days of intoxication. (auth)

Desnoyers, P.A.; Chang, L.W.

1975-06-01T23:59:59.000Z

177

RESEARCH Open Access Kinetics of DNA methylation inheritance by the  

E-Print Network (OSTI)

/G1 phase was superior to that seen in S phase, but not the observation that the number of the Dnmt1/ PPARg dots seen in S phase was superior to that seen in G2/M phase. Without explaining all variations-treated cells was due to an accumulation of p53. Acknowledgements We thank to Philippe Hulin for its technical

Paris-Sud XI, Université de

178

The Esterification of Naphthenic Acids for Methyl Ester Production .  

E-Print Network (OSTI)

??The remediation of tailings water, a by-product of bitumen extraction, is of utmost importance to the Athabasca oil sands industry due to its toxicity to… (more)

Dastjerdi, Zahra

2010-01-01T23:59:59.000Z

179

Global methylation responses to low dose radiation exposure  

NLE Websites -- All DOE Office Websites (Extended Search)

comprises a very large proportion of the mouse and human genomes. Using bisulphite modification and quantitative real-time PCR, the method can be used to analyse a very large pool...

180

Study of methyl group rotations and primary relaxation in poly ...  

Science Conference Proceedings (OSTI)

... experiment, we will start with a fixed window scan (FWS), covering the entire ... 4 K. The measurements performed here will cover a temperature ...

2013-04-02T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

Engineering of bacterial methyl ketone synthesis for biofuels  

E-Print Network (OSTI)

ketone synthesis for biofuels Ee-Been Goh†† 1,3 , Edward E.microbes for use as biofuels, such as fatty acid ethylother fatty acid-derived biofuels, such as fatty acid ethyl

Goh, Ee-Been

2012-01-01T23:59:59.000Z

182

Investigation of the Atmospheric Ozone Impacts of Methyl Iodide  

E-Print Network (OSTI)

ethylene, propylene, n-butane and trans-2-butene werepropane, propylene, n-butane, n-hexane, toluene, n-octaneas ethylene, propylene, n-butane and trans-2-butene and 30 m

Carter, W P L

2007-01-01T23:59:59.000Z

183

Validation in Genomics: CpG Island Methylation Revisited  

E-Print Network (OSTI)

analysis. In: Functional Genomics: Methods and Protocols, M.Segal: Validation in Genomics: CpG Island Methylationpackage and applications to genomics. Bioinformatics and

Segal, Mark R

2006-01-01T23:59:59.000Z

184

An experimental design algorithm applied to study of methyl ...  

Science Conference Proceedings (OSTI)

... The oxidation of hydrocarbon fuels proceeds by means of the ... to simulate these experiments, in this case the Jet Surrogate Fuel model. ...

185

Engineering of Bacterial Methyl Ketone Synthesis for Biofuels  

Published Ahead of Print 28 October 2011. €€ 10.1128/AEM.06785-11. Appl. Environ. Microbiol.€2012, 78(1):70. DOI: Harry R. Beller Ee-Been Goh, Edward E. K ...

186

Report on field experiment program lithium bromide absorption chiller: Field gas conditioning project, Grayson County, Texas. Topical report, May 1991-December 1994  

Science Conference Proceedings (OSTI)

The primary objective of the project was to determine the applicability of using commercial absorption air conditioning technology in an oil and gas field environment to condition natural gas to meet contractual limitations. Operational and maintenance requirements were documented throughout the test period of 1992 through 1994.

Lane, M.J.; Kilbourn, R.A.; Huey, M.A.

1995-12-01T23:59:59.000Z

187

Biomass burning sources of nitrogen oxides, carbon monoxide, and non-methane hydrocarbons  

SciTech Connect

Biomass burning is an important source of many key tropospheric species, including aerosols, carbon dioxide (CO{sub 2}), nitrogen oxides (NO{sub {times}}=NO+NO{sub 2}), carbon monoxide (CO), methane (CH{sub 4}), nitrous oxide (N{sub 2}O), methyl bromide (CH{sub 3}Br), ammonia (NH{sub 3}), non-methane hydrocarbons (NMHCs) and other species. These emissions and their subsequent products act as pollutants and affect greenhouse warming of the atmosphere. One important by-product of biomass burning is tropospheric ozone, which is a pollutant that also absorbs infrared radiation. Ozone is formed when CO, CH{sub 4}, and NMHCs react in the presence of NO{sub {times}} and sunlight. Ozone concentrations in tropical regions (where the bulk of biomass burning occurs) may increase due to biomass burning. Additionally, biomass burning can increase the concentration of nitric acid (HNO{sub 3}), a key component of acid rain.

Atherton, C.S.

1995-11-01T23:59:59.000Z

188

Chemical agent decontamination composition comprising a ...  

U.S. Energy Information Administration (EIA)

Title: Chemical agent decontamination composition comprising a perfluorinated alkyl bromide Date: 05/13/2008

189

Progress in the Los Alamos Scientific Laboratory program to develop thermochemical processes for hydrogen production. [Oxide-sulfate cycles; sulfuric acid cycles; bromide-sulfate cycles; sulfuric acid-sulfur cycles; hybrid cycles  

DOE Green Energy (OSTI)

The Los Alamos Scientific Laboratory Program to develop thermochemical processes for hydrogen production is based on attempts to develop criteria required of an ideal process and to search for types of thermochemical cycles that approximate these criteria. The advantages of reactions with large entropy changes have been demonstrated. The necessity for experimental verification of conceptual cycles has become apparent from the program. This necessity has been stressed in the paper. It should be emphasized that any comparison of conceptual cycles or of engineering or cost analyses must eventually be based on real, rather than assumed, data. (auth)

Bowman, M.G.

1976-01-01T23:59:59.000Z

190

Methyl chloride via oxyhydrochlorination of methane. Quarterly technical progress report No. 10, January 1944--March 1994  

SciTech Connect

In work related to the design and construction of the Process Development Unit (PDU) this quarter involved further detail design and a real start to the construction activities. Status updates are given below for each discipline in the Task 2.0 and 3.0 headings. This work is progressing well. with the caveat of several small slips in the scheduling. On the catalyst development front this quarter was extremely productive. Many catalyst screening experiments were completed and they showed that control of the reaction exotherm is going to be quite challenging under PDU conditions. The presence of much more efficient reactor design and the ability to maintain closer to isothermal conditions is expected to give a significant advantage in actual PDU operation. A major concern at the moment is the cost of La in the catalyst being used. An action plan to remedy this is being put together.

NONE

1994-08-01T23:59:59.000Z

191

glutamate-activated N-methyl-D-aspartate (NMDA) channels have recently been de-  

E-Print Network (OSTI)

nA 2 -30 nA E DEPOL PULSE IOlnV I +2.0 nA ' 1 0.5 s Figure 7. Intracellular current injection during

Alford, Simon

192

he increasing frequency of detection of the widely used gasoline additive methyl tert-  

E-Print Network (OSTI)

/L. For the city's Char- nock well field, an initial review of known and sus- pected petroleum spill sites identified about 10 potential sources that lay within 1 km of the well field, lay above the hydrologic unit (LUFTs) and leaking pipelines, other sources of MTBE in groundwater include tank overfilling and faulty

193

3-Methyl-1-butanol production in Escherichia coli: random mutagenesis and two-phase fermentation  

E-Print Network (OSTI)

Bioethanol production is an attractive option because of the high productivity and yield during fermentation.

Connor, Michael R.; Cann, Anthony F.; Liao, James C.

2010-01-01T23:59:59.000Z

194

207_06 Structural Analysis of Unsaturated Fatty Acid Methyl Ester Isomers with Acetonitrile Covalent  

Science Conference Proceedings (OSTI)

AOCS Press, Urbana, IL 61802 ©2006 by AOCS Press. All rights reserved. No part of this PDF may be repro-

195

A comparative analysis of DNA methylation across human embryonic stem cell lines  

E-Print Network (OSTI)

Regenerative Medicine and Stem Cell Research at UCLA (to SEJ and MP), and by the Department of Energy

Chen, Pao-Yang; Feng, Suhua; Joo, Jong; Jacobsen, Steve E; Pellegrini, Matteo

2011-01-01T23:59:59.000Z

196

Outbreak of Minamata Disease (methyl mercury poisoning) in cats on northwestern Ontario Reserves  

SciTech Connect

Pathological, histochemical, and analytical studies have confirmed the presence of Minamata Disease in at least one of two cats that lived on or near Indian Reserves in Northwestern Ontario, Canada. These symptoms parallel the Japanese experience in the 1950s and raise ominous health considerations for the Indians who share their diet of fish. After being fed a diet that primarily consisted of fish from the English River, one cat developed such acute neurological symptoms as an ataxic gait, other abnormal movements, uncontrolled howling, and seizures. The total mercury analyses showed high levels in all tissues with 16.4 mg/kg in the brain comparable with symptomatic cats in Japan. A second cat that appeared normal had 6.9 mg/kg in its brain tissues, and pathological studies confirmed the presence of latent Minamata Disease.

Takeuchi, T. (Kumamoto Univ., Japan); D' Itri, F.M.; Fischer, P.V.; Annett, C.S.; Okabe, M.

1977-04-01T23:59:59.000Z

197

Outbreak of minamata disease (methyl mercury poisoning) in cats on Northwestern Ontario reserves  

SciTech Connect

Pathological, histochemical, and analytical studies have confirmed the presence of Minamata Disease in at least one of two cats that lived on or near Indian Reserves in Northwestern Ontario, Canada. These symptoms parallel the Japanese experience in the 1950s and raise ominous health considerations for the Indians who share their diet of fish. After being fed a diet that primarily consisted of fish from the English River, one cat developed such acute neurological symptoms as an ataxic gait, other abnormal movements, uncontrolled howling, and seizures. The total mercury analyses showed high levels in all tissues with 16.4 mg/kg in the brain comparable with symptomatic cats in Japan. A second cat that appeared normal had 6.9 mg/kg in its brain tissues, and pathological studies confirmed the presence of latent Minamata Disease.

Takeuchi, T. (Kumamoto Univ., Japan); D' Itri, F.M.; Fischer, P.V.; Annett, C.S.; Okabe, M.

1977-04-01T23:59:59.000Z

198

Treatment of Methyl tert-Butyl Ether Vapors in Biotrickling Filters. 2.  

E-Print Network (OSTI)

will controlled by diffusion in the biofilm near the outlet of the reactor. A fundamental parameter and control in bioreactors equipped with some degree of instrumentation, fundamental knowledge for the proper handbook of physical-chemical properties and environmental fate for organic chemicals, Volume III. Volatile

199

Thermal Decomposition of Methyl Butanoate: Ab Initio Study of a Biodiesel Fuel Surrogate  

E-Print Network (OSTI)

. (1989a,b) from a molecular dynamics simulation of the measured structure factor results of Susman et al., and BOLLER,A.,1994, Thermochim. Acta, 238, 227. ZHANG,M., and BOOLCHAND,P.,1994, Science, 266, 1355. 1772

Violi, Angel

200

Characterization of gaseous and particulate emissions from combustion of algae based methyl ester biodiesel.  

E-Print Network (OSTI)

??The advantages to using biodiesel in place of petroleum diesel are also accompanied by disadvantages. Biodiesel is usually made from crops that are also used… (more)

Fisher, Bethany Cheryl

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

Treatment of Methyl tert-Butyl Ether Vapors in Biotrickling Filters. 1.  

E-Print Network (OSTI)

, weed-eater, shovel, and a rake. A chipper, compost bin, or a large rented trash dumpster may be useful

202

Polyol-mediated synthesis of zinc oxide nanorods and nanocomposites with poly(methyl methacrylate)  

Science Conference Proceedings (OSTI)

ZnO nanorods (length 30-150 nm) were synthesized in di(ethylene glycol) using Zn(CH3COO)2 as a precursor and para-toluene sulphonic acid, p-TSA, as an end-capping agent. Increasing the concentration of p-TSA above 0.1M causes the ...

Alojz Anžlovar; Zorica Crnjak Orel; Ksenija Kogej; Majda Žigon

2012-01-01T23:59:59.000Z

203

ATRX ADD domain links an atypical histone methylation recognition mechanism to human mental-retardation syndrome  

SciTech Connect

ATR-X (alpha-thalassemia/mental retardation, X-linked) syndrome is a human congenital disorder that causes severe intellectual disabilities. Mutations in the ATRX gene, which encodes an ATP-dependent chromatin-remodeler, are responsible for the syndrome. Approximately 50% of the missense mutations in affected persons are clustered in a cysteine-rich domain termed ADD (ATRX-DNMT3-DNMT3L, ADD{sub ATRX}), whose function has remained elusive. Here we identify ADD{sub ATRX} as a previously unknown histone H3-binding module, whose binding is promoted by lysine 9 trimethylation (H3K9me3) but inhibited by lysine 4 trimethylation (H3K4me3). The cocrystal structure of ADD{sub ATRX} bound to H3{sub 1-15}K9me3 peptide reveals an atypical composite H3K9me3-binding pocket, which is distinct from the conventional trimethyllysine-binding aromatic cage. Notably, H3K9me3-pocket mutants and ATR-X syndrome mutants are defective in both H3K9me3 binding and localization at pericentromeric heterochromatin; thus, we have discovered a unique histone-recognition mechanism underlying the ATR-X etiology.

Iwase, Shigeki; Xiang, Bin; Ghosh, Sharmistha; Ren, Ting; Lewis, Peter W.; Cochrane, Jesse C.; Allis, C. David; Picketts, David J.; Patel, Dinshaw J.; Li, Haitao; Shi, Yang (Harvard-Med); (Ottawa Hosp.); (MSKCC); (Rockefeller); (CH-Boston); (Tsinghua); (Mass. Gen. Hosp.)

2011-07-19T23:59:59.000Z

204

ATRX ADD Domain Links an Atypical Histone Methylation Recognition Mechanism to Human Mental-Retardation Syndrome  

SciTech Connect

ATR-X (alpha-thalassemia/mental retardation, X-linked) syndrome is a human congenital disorder that causes severe intellectual disabilities. Mutations in the ATRX gene, which encodes an ATP-dependent chromatin-remodeler, are responsible for the syndrome. Approximately 50% of the missense mutations in affected persons are clustered in a cysteine-rich domain termed ADD (ATRX-DNMT3-DNMT3L, ADD{sub ATRX}), whose function has remained elusive. Here we identify ADD{sub ATRX} as a previously unknown histone H3-binding module, whose binding is promoted by lysine 9 trimethylation (H3K9me3) but inhibited by lysine 4 trimethylation (H3K4me3). The cocrystal structure of ADD{sub ATRX} bound to H3{sub 1-15}K9me3 peptide reveals an atypical composite H3K9me3-binding pocket, which is distinct from the conventional trimethyllysine-binding aromatic cage. Notably, H3K9me3-pocket mutants and ATR-X syndrome mutants are defective in both H3K9me3 binding and localization at pericentromeric heterochromatin; thus, we have discovered a unique histone-recognition mechanism underlying the ATR-X etiology.

S Iwase; B Xiang; S Ghosh; T Ren; P Lewis; J Cochrane; C Allis; D Picketts; D Patel; et al.

2011-12-31T23:59:59.000Z

205

Inhibition of IFN-[gamma] promoter function by site-specific methylation  

E-Print Network (OSTI)

When they become activated, naive helper T cells are able to polarize into either THI cells or TH2 cells. Development of naive CD4+ T cells into TH1 cells is characterized by the expression of IFN-y and the silencing of ...

Jones, Brendan T. (Brendan Taber)

2006-01-01T23:59:59.000Z

206

Characterization and research investigation of methanol and methyl fuels. Final progress report  

DOE Green Energy (OSTI)

Work on several aspects of using pure methanol as an alternate fuel are reported. A stock (OEM) Pinto engine mounted on a dynamometer was used to compare methanol with Indolene in terms of power, efficiency, and emissions for a variety of speeds and loads. Although the engine was designed for use with gasoline, it was found that methanol was generally superior in power, thermal efficiency and reduced emissions with the exception of aldehydes. Three different fuel metering systems were tested for a variety of speeds and loads using the dynamometer mounted engine. They were all found to provide superior steady state performance on methanol when compared with the OEM carburetor system with enlarged fuel jets for methanol. Mileage and emissions from a Pinto vehicle equipped with the various fuel metering systems were computer predicted for the Federal emissions test procedure using laboratory engine measurements. A computer was used to simulate the test engine's thermokinetic combustion events. The computer model predicts power, fuel economy and emissions with air-fuel ratio, compression ratio, spark advance and speed as parameters. A small (60 hp) gas turbine was converted to run on methanol. The conversion was easily accomplished, but atomization of the fuel was found to be important in obtaining a reduction in CO and NO/sub x/ for methanol in comparison with jet engine fuel. Environmental factors of marine and aquatic methanol spills and photochemical smog are under study. Preliminary experimentation relative to marine spills indicates that methanol is naturally present in that environment. It appears at this early stage of investigation that damage to the ecosystem from a major coastal spill may be localized and of short duration.

Pefley, R.K.; Browning, L.H.; Hornberger, M.L.; Likos, W.E.; McCormack, M.C.; Pullman, B.

1977-01-01T23:59:59.000Z

207

3-Methyl-1-butanol production in Escherichia coli: random mutagenesis and two-phase fermentation  

E-Print Network (OSTI)

Interest in producing biofuels from renewable sources hasafter 60 h. Keywords Biofuels . Metabolic engineering .2008; Stephanopoulos 2007). Biofuels produced from renewable

Connor, Michael R.; Cann, Anthony F.; Liao, James C.

2010-01-01T23:59:59.000Z

208

Catalytic Hydrodeoxygenation of Methyl-Substituted Phenols: Correlations of Kinetic Parameters with Molecular Properties  

E-Print Network (OSTI)

-of-the-art of using alternative, renewable, and/or novel feedstocks (such coal; biomass; oil shale; tar sands reserves, and heavy oil from tar sands or oil shale. These feedstock sources have been evaluated compounds into smaller molecules. Oil shale in Colorado has the potential to be a large scale domestic

Simons, Jack

209

Evaluation of neural networks-based controllers in batch polymerisation of methyl methacrylate  

Science Conference Proceedings (OSTI)

The importance of batch reactors in today's process industries cannot be overstated. Thus said, it is important to optimise their operation in order to consistently achieve products of high quality while minimising the production of undesirables. In ... Keywords: Batch polymerisation, Batch reactor control, Batch reactor optimisation

E. E. Ekpo; I. M. Mujtaba

2008-03-01T23:59:59.000Z

210

Aging effects on DNA methylation modules in human brain and blood tissue  

E-Print Network (OSTI)

changes in chromosomes cause aging? Cell 1996, 86:9-12. 2.M: Cross-Talk between Aging and Cancer. Annals of the NewMF, Esteller M: Epigenetics and aging: the targets and the

2012-01-01T23:59:59.000Z

211

Type II restriction-modification system methylation subunit of Alicyclobacillus acidocaldarius  

SciTech Connect

Isolated and/or purified polypeptides and nucleic acid sequences encoding polypeptides from Alicyclobacillus acidocaldarius are provided. Further provided are methods for modulating or altering recombination inside or outside of a cell using isolated and/or purified polypeptides and/or nucleic acid sequences from Alicyclobacillus acidocaldarius.

Lee, Brady D; Newby, Deborah T; Lacey, Jeffrey A; Thompson, David N; Thompson, Vicki S; Apel, William A; Roberto, Francisco F; Reed, David W

2013-10-29T23:59:59.000Z

212

Building and Fire Publications  

Science Conference Proceedings (OSTI)

... Radermacher, R. Experimental Comparison of Ammonia-Water and Ammonia-Water Lithium Bromide ... Thermophysical Properties, 10th Symposium ...

213

Building and Fire Publications  

Science Conference Proceedings (OSTI)

... PA; Didion, DA; Experimental Comparison of Ammonia-Water and Ammonia-Water Lithium Bromide ... Thermophysical Properties, 10th Symposium. ...

214

METHOD OF SEPARATING URANIUM, PLUTONIUM AND FISSION PRODUCTS BY BROMINATION AND DISTILLATION  

DOE Patents (OSTI)

The method for separation of plutonium from uranium and radioactive fission products obtained by neutron irradiation of uranlum consists of reacting the lrradiated material with either bromine, hydrogen bromide, alumlnum bromide, or sulfur and bromine at an elevated temperature to form the bromides of all the elements, then recovering substantlally pure plutonium bromide by dlstillatlon in combinatlon with selective condensatlon at prescribed temperature and pressure.

Jaffey, A.H.; Seaborg, G.T.

1958-12-23T23:59:59.000Z

215

Atmospheric variability of methyl chloride during the last 300 years from an Antarctic ice core and firn air  

E-Print Network (OSTI)

as a low-pass filter, smoothing variations in the atmospheric composition of a gas over decadal time scales core measurements from Siple Dome provide evidence for a cyclic natural variability on the order of 10 increase measured in firn air may largely be a result of natural processes, which may continue to affect

Saltzman, Eric

216

Selective, On-Resin N-Methylation of Cyclic Peptides and Implications for the Discovery of Membrane Permeable Scaffolds  

E-Print Network (OSTI)

permission from Nat. Chem. Bio. 2011, 7, 810- 817. Copyrightpermission from Nat. Chem. Bio. 2011, 7, 810- 817. Copyright

White, Tina Renea

2012-01-01T23:59:59.000Z

217

The role of mismatch repair in mediating cellular sensitivity to cisplatin : the Escherichia coli methyl-directed repair paradigm  

E-Print Network (OSTI)

The anticancer drug cisplatin is in widespread use but its mechanism of action is only poorly understood. Moreover, human cancers acquire resistance to the drug, which limits its clinical utility. A paradox in the field ...

Robbins, Jennifer L

2006-01-01T23:59:59.000Z

218

Transcriptional response of O?-methylguanine methyltransferase deficient yeast to methyl-N-nitro-N-nitrosoguanidine (MNNG)  

E-Print Network (OSTI)

(cont.) of transcription factors and subsequently, induction of RNA processing (35% of genes incrementally induced) and kinases involved in protein phosphorylation. In the WT, the response was restricted to a transient ...

Rao, Anoop, 1977-

2004-01-01T23:59:59.000Z

219

Whole-Genome Analysis of Methyl tert-Butyl Ether-Degrading Beta-Proteobacterium Methylibium petroleiphilum PM1  

E-Print Network (OSTI)

of benzene to phenol, catechol, and 1,2,3-trihydroxybenzeneof benzene to phenol (and catechol), and toluene toa multi-component PH, catechol 2,3-dioxygenase and the meta-

2007-01-01T23:59:59.000Z

220

Quantitative analysis of DNA methylation at all human imprinted regions reveals preservation of epigenetic stability in adult somatic tissue  

E-Print Network (OSTI)

DIRAS3 (1) 60 80 100 at io n DIRAS3 (2) 60 80 100 at io n Bn Bt Co He Ki Li Pl Te Bl 0 20 40 % M et hy la Bn Bt Co He Ki Li Pl Te Bl 0 20 40 % M et hy la Tissue Tissue DIRAS3 (3) 100 ZDBF2 80 100 20 40 60 80 % M et hy la tio n 20 40 60 % M et hy... at io n SLC22A1 60 80 100 yl at io n Bn Bt Co He Ki Li Pl Te 0 20 40 Ti % M et hy Bn Bt Co He Ki Li Pl Te 0 20 40 Ti % M et hy ssue ssue SLC22A3 80 100 MEST (s) 80 100 20 40 60 % M et hy la tio n 20 40 60 % M et hy la tio n Bn Bt Co He Ki Li Pl Te 0...

Woodfine, Kathryn; Huddleston, Joanna E; Murrell, Adele

2011-01-31T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

Structure of trans-methyl 2-phenylhexahydro-2H-isoxazolo (2,3-a)-pyridine-3-carboxylate  

SciTech Connect

The title compound, a 1,3-dipolar cycloaddition product, crystallizes in the monoclinic space group P2[sub 1]/c, with a = 8.199(3), b = 16.908(1), c = 10.248(2) [angstrom],[beta] = 93.58(2)[degrees] and Z = 4. The structure was solved by direct methods and refined by full matrix least squares methods to R = 0.038 for 1687 observed reflections. The stereochemistry of this compound was found to have the [open quotes]ee[close quotes] conformation in the solid state as well as in solution. The piperidine ring in the molecule is in the chair form and the isoxazolidine ring adopts an envelope conformation.

Ul-Haque, M.; Horne, W.; Ali, S.A. (King Fahd Univ. of Petroleum and Minerals, Dhahran (Saudi Arabia))

1993-02-01T23:59:59.000Z

222

Kinetic Model Development for the Combustion of Particulate Matter from Conventional and Soy Methyl Ester Diesel Fuels  

DOE Green Energy (OSTI)

The primary objective of this research has been to investigate how the oxidation characteristics of diesel particulate matter (PM) are affected by blending soy-based biodiesel fuel with conventional ultra low sulfur diesel (ULSD) fuel. PM produced in a light duty engine from different biodiesel-conventional fuel blends was subjected to a range of physical and chemical measurements in order to better understand the mechanisms by which fuel-related changes to oxidation reactivity are brought about. These observations were then incorporated into a kinetic model to predict PM oxidation. Nanostructure of the fixed carbon was investigated by HR-TEM and showed that particulates from biodiesel had a more open structure than particulates generated from conventional diesel fuel, which was confirmed by BET surface area measurements. Surface area evolution with extent of oxidation reaction was measured for PM from ULSD and biodiesel. Biodiesel particulate has a significantly larger surface area for the first 40% of conversion, at which point the samples become quite similar. Oxidation characteristics of nascent PM and the fixed carbon portion were measured by temperature programmed oxidation (TPO) and it was noted that increased biodiesel blending lowered the light-off temperature as well as the temperature where the peak rate of oxidation occurred. A shift in the oxidation profiles of all fuels was seen when the mobile carbon fraction was removed, leaving only the fixed carbon, however the trend in temperature advantage of the biofuel blending remained. The mobile carbon fraction was measured by temperature programmed desorption found to generally increase with increasing biodiesel blend level. The relative change in the light-off temperatures for the nascent and fixed carbon samples was found to be related to the fraction of mobile carbon. Effective Arrhenius parameters for fixed carbon oxidation were directly measured with isothermal, differential oxidation experiments. Normalizing the reaction rate to the total carbon surface area available for reaction allowed for the definition of a single reaction rate with constant activation energy (112.5 {+-} 5.8 kJ/mol) for the oxidation of PM, independent of its fuel source. A kinetic model incorporating the surface area dependence of fixed carbon oxidation rate and the impact of the mobile carbon fraction was constructed and validated against experimental data.

Strzelec, Andrea [ORNL

2009-12-01T23:59:59.000Z

223

Complexation of NpO2+ with N-methyl-iminodiacetic Acid: in Comparison with Iminodiacetic and Dipicolinic Acids  

E-Print Network (OSTI)

element in spent nuclear fuel reprocessing because it couldthe development of advanced nuclear fuel cycles, there is an

Rao, Linfeng

2011-01-01T23:59:59.000Z

224

Whole-Genome Analysis of Methyl tert-Butyl Ether-Degrading Beta-Proteobacterium Methylibium petroleiphilum PM1  

E-Print Network (OSTI)

by pure cultures of butane-degrading bacteria. Appl.of K s values for MTBE by butane- degrading bacteria (52).

2007-01-01T23:59:59.000Z

225

The Friction and Wear Behaviors of (quinazolin-4-ones)-3-methyl-butyl Borate as Additive in Liquid Paraffin  

Science Conference Proceedings (OSTI)

There has been growing concern for the use of mineral oils because of the worldwide interest in environmental issues. This has promoted the use of ash less additives as environmental friendly lubricants. A potential ash less additive containing N, B, ... Keywords: Synthesis, Quinazolin-4-ones, Borate, Additive, Friction and wear behaviors

Ouyang Ping; Zhang Xianming

2011-01-01T23:59:59.000Z

226

Diamond and Related Materials 7 (1998) 14911502 Growth of diamond films using an enclosed methyl-acetylene and  

E-Print Network (OSTI)

(Sorensen, Model DCS bottom of the burner. No thermocouple was placed in 33-33). The substrate and heater-red optical pyrometer (Williamson, Model 8200), water and a microprocessor thermometer (Model HH23 in a flat copper, and water cooled via a 0.25-inch copper tubing soft-soldered to the burner body

Dandy, David

227

IDENTIFYING THE USAGE PATTERNS OF METHYL TERT-BUTYL ETHER (MTBE) AND OTHER OXYGENATES IN GASOLINE USING GASOLINE  

E-Print Network (OSTI)

and Energy Research (NIPER), 2) the Motor Vehicle Manufacturers Association (MVMA), and 3) the U interested in fuel comparisons Thousands each year Motor Vehicle Manufacturers Association (MVMA) National gasoline survey Motor Vehicle Manufacturers Association 23 cities throughout the U.S. Summer of 1988

228

The dynamics of conformational isomerization in flexible biomolecules. I. Hole-filling spectroscopy of N-acetyl tryptophan methyl amide  

E-Print Network (OSTI)

macrophytes. Assemblages with intermediate sized barbel and nase (100­200 mm TL), the larger size classes Cyprinidae of intermediate size classes (100­200 mm TL) as well as common carp and mosquitofish charac and intermediate sizes ( 200 mm TL) of the two benthic

Zwier, Timothy S.

229

Hybrid Plasma Reactor/Filter for Transportable Collective Protection Systems  

SciTech Connect

Pacific Northwest National Laboratory (PNNL) has performed an assessment of a Hybrid Plasma/Filter system as an alternative to conventional methods for collective protection. The key premise of the hybrid system is to couple a nonthermal plasma (NTP) reactor with reactive adsorption to provide a broader envelope of protection than can be provided through a single-solution approach. The first step uses highly reactive species (e.g. oxygen radicals, hydroxyl radicals, etc.) created in a nonthermal plasma (NTP) reactor to destroy the majority (~75% - 90%) of an incoming threat. Following the NTP reactor an O3 reactor/filter uses the O3 created in the NTP reactor to further destroy the remaining organic materials. This report summarizes the laboratory development of the Hybrid Plasma Reactor/Filter to protect against a ‘worst-case’ simulant, methyl bromide (CH3Br), and presents a preliminary engineering assessment of the technology to Joint Expeditionary Collective Protection performance specifications for chemical vapor air purification technologies.

Josephson, Gary B.; Tonkyn, Russell G.; Frye, J. G.; Riley, Brian J.; Rappe, Kenneth G.

2011-04-06T23:59:59.000Z

230

Methods for collection and analysis of geopressured geothermal and oil field waters  

DOE Green Energy (OSTI)

Present methods are described for the collection, preservation, and chemical analysis of waters produced from geopressured geothermal and petroleum wells. Detailed procedures for collection include precautions and equipment necessary to ensure that the sample is representative of the water produced. Procedures for sample preservation include filtration, acidification, dilution for silica, methyl isobutyl ketone (MIBK) extraction of aluminum, addition of potassium permanganate to preserve mercury, and precipitation of carbonate species as strontium carbonate for stable carbon isotopes and total dissolved carbonate analysis. Characteristics determined at the well site are sulfide, pH, ammonia, and conductivity. Laboratory procedures are given for the analysis of lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, strontium, barium, iron, manganese, zinc, lead, aluminum, and mercury by atomic absorption and flame emission spectroscopy. Chloride is determined by silver nitrate titration and fluoride by ion-specific electrode. Bromide and iodide concentrations are determined by the hypochlorite oxidation method. Sulfate is analyzed by titration using barium chloride with thorin indicator after pretreatment with alumina. Boron and silica are determined colorimetrically by the carmine and molybdate-blue methods, respectively. Aliphatic acid anions (C/sub 2/ through C/sub 5/) are determined by gas chromatography after separation and concentration in a chloroform-butanol mixture.

Lico, M.S.; Kharaka, Y.K.; Carothers, W.W.; Wright, V.A.

1982-01-01T23:59:59.000Z

231

Report to Congress on Server and Data Center Energy Efficiency: Public Law 109-431: Appendices  

E-Print Network (OSTI)

in conjunction with an absorption chiller to assist with thethermal demand of an absorption chiller having an output oflithium bromide absorption chillers because the silica gel

Brown, Richard; Alliance to Save Energy; ICF Incorporated; ERG Incorporated; U.S. Environmental Protection Agency

2008-01-01T23:59:59.000Z

232

Distributed Energy Resources at Naval Base Ventura County Building 1512: A Sensitivity Analysis  

E-Print Network (OSTI)

a lithium bromide absorption chiller that produces a liquidthermal energy for an absorption chiller to supply liquidthe refrigerated area. ) The absorption chiller assists the

Bailey, Owen C.; Marnay, Chris

2005-01-01T23:59:59.000Z

233

Document:  

Office of Legacy Management (LM)

pH, dissolved oxygen, and bromide, consecutively; and the development of a thermal-pulse flowmeter logging tool for measuring vertical groundwater flow in boreholes....

234

NETL F 451.1-1/1 Categorical Exclusion (CX) Designation Form  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Grid & Sacramento Mun. Util. Install and demonstrate trailer mounted 500kW6hr Premium power zinc bromide flow batteries at future substation at Anatolia Village near...

235

Index of Semiconductor Process Gases  

Science Conference Proceedings (OSTI)

... Hydrogen Bromide, HBr. Vinyl Fluoride. C 2 H 3 F. Hydrogen Chloride, HCl. Vinyl Chloride. C 2 H 3 Cl. Hydrogen Fluoride, HF. Trimethyl Gallium. ...

2012-07-27T23:59:59.000Z

236

Soil sterilization and organic carbon, but not microbial inoculants, change microbial communities in replanted peach orchards  

E-Print Network (OSTI)

bromide fumigation; above, compost spread down the row priorpeach trees i n February 2001. Compost and native soil werein two of the three compost-amended treatments. Composted

Drenovsky, Rebecca E.; Duncan, Roger A.; Scow, Kate M.

2005-01-01T23:59:59.000Z

237

The Risk Assessment Information System  

NLE Websites -- All DOE Office Websites (Extended Search)

et al., 1989). Bromoform is formed as a byproduct during water chlorination when chlorine reacts with endogenous organic materials such as humic and fulvic acid and bromide...

238

Effects of physical and geochemical heterogeneities on mineral transformation and biomass accumulation during uranium bioremediation at Rifle, Colorado  

E-Print Network (OSTI)

bioremediation at Rifle, Colorado. Environ. Sci. Technol. ,bioremediation at Rifle, Colorado Li Li, Carl I. Steefel,experiment near Rifle, Colorado. Field bromide breakthrough

Li, Li

2010-01-01T23:59:59.000Z

239

Building and Fire Publications  

Science Conference Proceedings (OSTI)

... of Ammonia-Water and Ammonia-Water Lithium Bromide ... Klein, SA; Thermophysical Property Need for ... Thermophysical Properties, 10th Symposium ...

240

The Study of Heat and Mass Transfer In The Generator For an Absorption Air Conditioning System.  

E-Print Network (OSTI)

??This thesis is aimed to study the heat and mass transfer performance of a generator for the absorption cooling system. Both aqueous lithium bromide (LiBr)… (more)

Hsu, Yu-lien

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

Effect of Gold Nanorod Surface Chemistry on Cellular Response  

E-Print Network (OSTI)

Gold nanorods (GNRs) stabilized with cetyltrimethylammonium bromide (CTAB) and GNR functionalized via a ligand exchange method with either thiolated polyethylene glycol (PEG5000) or mercaptohexadecanoic acid (MHDA) were ...

Grabinski, Christin

242

Amphetamine effects on startle gating in normal women and female rats  

E-Print Network (OSTI)

nucleus accumbens (NAC) catechol-O-methyl transferase (COMT)low activity to the enzyme catechol-O-methyl transferase (

Talledo, Jo A.; Sutherland Owens, Ashley N.; Schortinghuis, Tijmen; Swerdlow, Neal R.

2009-01-01T23:59:59.000Z

243

Atomic scale investigations of the thermal and electron induced chemistry of small molecules on platinum(111) as revealed by scanning tunneling microscopy  

Science Conference Proceedings (OSTI)

The work presented here can be divided into two parts: 1) an experimental and analysis section dealing with the investigation of small molecules such as methyl bromide, carbon dioxide, diatomic nitrogen, methane and methane?s photochemical derivative methyl radical adsorbed onto the Pt(111) surface, and 2) A detailed explanation of the current STM and chamber, with included designs and detailed instructions for operation and maintenance of both the STM and chamber. The investigations of the methyl bromide molecule show interesting dipole-dipole interactions on the Pt(111) surface. With a (6 x 3) lattice being described as the full monolayer that was created by overdosing and annealing to 104 K. The (6 x 3) lattice is shown to occupy top sites and three fold hollow sites on the Pt(111) surface giving rise to a very sharp and symmetrically split ?2 RAIRS mode, and the absence of the ?5 mode in RAIRS is indicative that the molecules are all aligned with their C-Br bond parallel to the surface normal. Additional sub-monolayer structures were observed that had components that were not aligned with the surface normal. The submonolayer lattices ranging from a structured 0.12 ML to a random coverages estimated at 0.20 ML, to a shift in the (6 x 3) lattice resulting in a high local line coverage of 0.33 ML. Analysis of the CO2 molecules adsorbed onto the Pt(111) surface shows that there is a preferred high temperature dosing that results in a thermodynamically stable system of a (3 x 3) lattice consisting of both horizontal and vertical molecules. The coverage of the (3 x 3) lattice of vertical molecules is 0.11 ML which can be assigned to the RAIRS peak of 2287 cm-1. The vertical molecules are seen to occupy the hollow sites within the horizontal (3 x 3) lattice. The low temperature dosage of multilayers and annealing, to 78 K, show that the (3 x 3) lattice is compressed into a lattice of (5 x 3) with some of the molecules in the unit cell that are incommensurate with the Pt(111) lattice. However, isolated unit cells of the horizontal (3 x 3) lattices remain after the compression which allows a single vertical CO2 molecule to occupy the hollow site resulting in the characteristic 2277 cm-1 peak in RAIRS. The resulting local coverage of the (5 x 3) lattice is calculated to be 0.40 ML. Methane was found to adsorb onto the Pt(111) lattice in a (?3 x ?3) configuration yielding a coverage of 0.33 ML in perfect agreement with previous coverage assignments. With a full coverage of methane adsorbed onto the crystal surface an ArF excimer laser was used to photodissociate the molecules to create methyl radicals that could be imaged by STM. After photochemical deposition of methyl radicals and annealing the surface to 175 K, the STM was used to image the surface. The methyl radical were estimated to arrange in a (?3 by ?3) lattice same as the methane, and imaged as roughly 0.4 ? high protrusions from the surface with a diameter of 5.5 ?. The last molecule that was studied, was the adsorption of diatomic nitrogen on the Pt(111) surface at a temperature of 25 K. Due to the very low desorption temperature of N2 (i.e. 46 K) and the relatively high temperature of the crystal, only chemisorbed molecules were able to be resolved. The results confirm that diatomic nitrogen binds to the top side of the Pt(111) step edge in agreement with Yates RAIRS studies, and calculations by Norskov. However, there was observed a stable cluster of molecules bound to the lower side of the step edge in a (2 x 2) lattice configuration which has previously unknown before these images and is the most likely source of the photoactivity of nitrogen molecules on the crystal surface. It is the hopes of this author that the experiments described within the dissertation lead to new and better understanding of the role that the microscopic scale structures of adsorbates on the surface play in catalysis. Also that the general information of STM design, construction and tip fabrication will be useful to all students who follow me in working

Schwendemann, Todd Charles

2006-01-01T23:59:59.000Z

244

Atomic scale investigations of the thermal and electron induced chemistry of small molecules on platinum(111) as revealed by scanning tunneling microscopy  

SciTech Connect

The work presented here can be divided into two parts: 1) an experimental and analysis section dealing with the investigation of small molecules such as methyl bromide, carbon dioxide, diatomic nitrogen, methane and methane?s photochemical derivative methyl radical adsorbed onto the Pt(111) surface, and 2) A detailed explanation of the current STM and chamber, with included designs and detailed instructions for operation and maintenance of both the STM and chamber. The investigations of the methyl bromide molecule show interesting dipole-dipole interactions on the Pt(111) surface. With a (6 x 3) lattice being described as the full monolayer that was created by overdosing and annealing to 104 K. The (6 x 3) lattice is shown to occupy top sites and three fold hollow sites on the Pt(111) surface giving rise to a very sharp and symmetrically split ?2 RAIRS mode, and the absence of the ?5 mode in RAIRS is indicative that the molecules are all aligned with their C-Br bond parallel to the surface normal. Additional sub-monolayer structures were observed that had components that were not aligned with the surface normal. The submonolayer lattices ranging from a structured 0.12 ML to a random coverages estimated at 0.20 ML, to a shift in the (6 x 3) lattice resulting in a high local line coverage of 0.33 ML. Analysis of the CO2 molecules adsorbed onto the Pt(111) surface shows that there is a preferred high temperature dosing that results in a thermodynamically stable system of a (3 x 3) lattice consisting of both horizontal and vertical molecules. The coverage of the (3 x 3) lattice of vertical molecules is 0.11 ML which can be assigned to the RAIRS peak of 2287 cm-1. The vertical molecules are seen to occupy the hollow sites within the horizontal (3 x 3) lattice. The low temperature dosage of multilayers and annealing, to 78 K, show that the (3 x 3) lattice is compressed into a lattice of (5 x 3) with some of the molecules in the unit cell that are incommensurate with the Pt(111) lattice. However, isolated unit cells of the horizontal (3 x 3) lattices remain after the compression which allows a single vertical CO2 molecule to occupy the hollow site resulting in the characteristic 2277 cm-1 peak in RAIRS. The resulting local coverage of the (5 x 3) lattice is calculated to be 0.40 ML. Methane was found to adsorb onto the Pt(111) lattice in a (?3 x ?3) configuration yielding a coverage of 0.33 ML in perfect agreement with previous coverage assignments. With a full coverage of methane adsorbed onto the crystal surface an ArF excimer laser was used to photodissociate the molecules to create methyl radicals that could be imaged by STM. After photochemical deposition of methyl radicals and annealing the surface to 175 K, the STM was used to image the surface. The methyl radical were estimated to arrange in a (?3 by ?3) lattice same as the methane, and imaged as roughly 0.4 ? high protrusions from the surface with a diameter of 5.5 ?. The last molecule that was studied, was the adsorption of diatomic nitrogen on the Pt(111) surface at a temperature of 25 K. Due to the very low desorption temperature of N2 (i.e. 46 K) and the relatively high temperature of the crystal, only chemisorbed molecules were able to be resolved. The results confirm that diatomic nitrogen binds to the top side of the Pt(111) step edge in agreement with Yates RAIRS studies, and calculations by Norskov. However, there was observed a stable cluster of molecules bound to the lower side of the step edge in a (2 x 2) lattice configuration which has previously unknown before these images and is the most likely source of the photoactivity of nitrogen molecules on the crystal surface. It is the hopes of this author that the experiments described within the dissertation lead to new and better understanding of the role that the microscopic scale structures of adsorbates on the surface play in catalysis. Also that the general information of STM design, construction and tip fabrication will be useful to all students who follow me in working

Schwendemann, Todd Charles

2006-01-01T23:59:59.000Z

245

A Numerical Model for the Dynamic Simulation of a Recirculation Single-Effect Absorption Chiller  

E-Print Network (OSTI)

A Numerical Model for the Dynamic Simulation of a Recirculation Single- Effect Absorption Chiller A dynamic model for the simulation of a new single-effect water/lithium bromide absorption chiller. Keywords: absorption; chiller; modelling; transient; water-lithium bromide; falling film hal-00713904

Recanati, Catherine

246

Preparation of (ethylene-methacrylic acid) copolymer/vermiculite composites  

Science Conference Proceedings (OSTI)

In this research, the effect of modified filler on mechanical properties of polymer/clay composite was studied. Firstly, the filler - vermiculite was modified by two methods. Former one was done by hexadecyltrimethylammonium bromide, the latter by maleic ... Keywords: clay, hexadecyltrimethylammonium bromide, intercalation, maleic anhydride, surlyn, vermiculite

P. Zadrapa; J. Zykova; E. Tripska; J. Malac; L. Kovarova

2010-11-01T23:59:59.000Z

247

Surfactant development for enhanced oil recovery. Second quarterly report, January 1, 1994--March 31, 1994  

SciTech Connect

This report summarizes the activities of this grant during the second reporting period. During this period, several research activities concerning the synthesis and characterization of novel surfactants were performed. Of immediate interest was the investigation of surfactants identified in the first quarterly report, such as cetyltripropylammonium bromide and cetyltributylammonium bromide. These surfactants were of interest because of the low critical micelle concentration they exhibit.

Not Available

1994-05-17T23:59:59.000Z

248

Experimental and theoretical study of flame inhibition by bromine-containing compounds  

DOE Green Energy (OSTI)

The present paper represents the first effort to date in which a combined experimental and theoretical approach has been used to study the effects of several inhibitors on hydrocarbon-air flames. This work is part of an attempt to build a consistent picture of chemical kinetic flame inhibition, beginning with a simple halogen molecule such as HBr and progressing sequentially towards more complex and more practical inhibitors such as CF/sub 3/Br. Inhibition efficiency can be defined as the rate of flame speed reduction, the amount of flame speed change per unit inhibitor added. Both the numerical model and the flame tube measurements found that the inhibition efficiency gradually decreases as the amount of inhibitor is increased. The present experimental and modeling results are shown, together with earlier data for CF/sub 3/Br-CH/sub 4/-air and CF/sub 3/Br-C/sub 3/H/sub 8/-air as well as HBr-CH/sub 4/-air, CH/sub 3/Br-CH/sub 4/-air and CF/sub 3/Br-CH/sub 4/-air. In the numerical study it was found that a stoichiometric methane-air mixture with up to 8% methyl bromide could support a flame, propagating at a speed of about 5 cm/sec, even though the addition of the first 1% of CH/sub 3/Br had reduced the flame speed from 38 cm/sec to about 26 cm/sec. Extensions of the model to include CF/sub 3/Br are currently under development. The available experimental data suggest that CF/sub 3/Br is somewhat more efficient as an inhibitor than HBr or CH/sub 3/Br.

Westbrook, C.K.; Beason, D.G.; Alvares, N.J.

1981-01-20T23:59:59.000Z

249

Thermal Hazard Analysis of Methyl Ethyl Ketone Peroxide Ron-Hsin Chang, Chi-Min Shu and Po-Yin Yeh  

E-Print Network (OSTI)

. Additional requirements for the Qualified Person are set forth in NFPA 70E Article 110.6 (D)(1). A person can and according to the applicable codes (OSHA, NFPA 70E, etc.). DEFINITIONS A Competent Person is an individual and NFPA, has received safety training on the hazards involved with electricity, and by virtue of training

Chen, Shu-Ching

250

Photoluminescence spectral study of single CdSe/ZnS Colloidal Nanocrystals in Poly(methyl methacrylate) and Quantum Dots molecules  

E-Print Network (OSTI)

of the CdSe/ZnS nanocrystals . . . . . . . .D. CdSe/ZnS NCs in negative photon resist SU-line shapes of single CdSe VI Optical characterization of

Shen, Yaoming

2008-01-01T23:59:59.000Z

251

The versatile E. coli adaptive response protein AlkB mitigates toxicity and mutagenicity of etheno-, ethano-, and methyl-modified bases in vivo  

E-Print Network (OSTI)

The Escherichia coli AlkB protein is an exceptionally versatile DNA repair enzyme. Its expression is induced upon exposure to alkylating agents as part of the Ada-mediated adaptive response. This member of the ac-ketoglu ...

Frick, Lauren Elizabeth

2007-01-01T23:59:59.000Z

252

(Butan-2-ol-jO)[2-({(ethylsulfanyl)- [2-(2-oxidobenzylidene-jO)hydrazinylidene-jN 2]methyl}iminomethyl)phenolato-jO]dioxidouranium(VI)  

E-Print Network (OSTI)

disorder in main residue; R factor = 0.038; wR factor = 0.078; data-to-parameter ratio = 17.4. The U atom in the title complex, [U(C17H15N3O2S)O2-(C4H10O)], exists within a distorted pentagonal–bipyramidal geometry where the oxide O atoms occupy axial positions [O—U—O = 179.61 (18) ] and the pentagonal plane is defined by the N2O2 atoms of the tetradentate Schiff base ligand and the O atom of the butan-2-ol molecule. In the crystal, centrosymmetric aggregates are formed via pairs of hydroxy–phenoxide O—H O hydrogen bonds. The azomethine C N atoms, the ethylthiolyl group and the butyl group of the butan-2-ol molecule are disordered over two positions in a 0.668 (3):0.332 (3) ratio. Related literature For background to uranyl Schiff base complexes, see: S ¸ ahin et al. (2010); Özdemir et al. (2011). For a related structure, see: Takjoo et al. (2012).

Reza Takjoo; A Atefeh Najafi; A Seik Weng Ng B; Edward R. T. Tiekink B

2012-01-01T23:59:59.000Z

253

COMBUSTION SOURCES OF UNREGULATED GAS PHASE NITROGENEOUS SPECIES  

E-Print Network (OSTI)

Tetrazine 2-Methyl-2-Nitro Propane Cyanide)>': (Pryazole) (l~nitro~2-methyl~1~propane, both and the the Diechmannexhaust. l~nitro~2-methyl~2-propane, experiment, they found

Matthews, Ronald D.

2013-01-01T23:59:59.000Z

254

Assessing gene effects on the brain and risk for disease using machine learning  

E-Print Network (OSTI)

Harrison PJ, Weinberger DR. Catechol-o-methyltransferase,R, Delespaul P, van Os J. The catechol-O-methyl transferasein press), neuregulin, catechol-O-methyl transferase (COMT),

Kohannim, Omid

2012-01-01T23:59:59.000Z

255

NETL: Gasifipedia  

NLE Websites -- All DOE Office Websites (Extended Search)

chemical feedstock for production of a range of important industrial chemicals, primarily acetic acid, formaldehyde, methyl methacrylate and methyl tertiary-butyl ether (MTBE)....

256

Energy efficiency standards for residential and commercial equipment: Additional opportunities  

E-Print Network (OSTI)

10 HP) same as 2010 Absorption Chiller (25 HP) same as 2010Lithium Bromide Water Absorption Chiller (25 HP) same asWater Circulation, Absorption Chiller (25 HP) Lifetime (

Rosenquist, Greg; McNeil, Michael; Iyer, Maithili; Meyers, Steve; McMahon, Jim

2004-01-01T23:59:59.000Z

257

On parameterization of the inverse problem for estimating aquifer properties using tracer data  

E-Print Network (OSTI)

were pumped into the injection wells during the experiment.bromide at each injection well based on the concentration into the plane formed by the injection wells, and we fix the

Kowalsky, M.B.

2013-01-01T23:59:59.000Z

258

Intramolecular Heck couplings of unactivated alkyl electrophiles : synthetic and mechanistic studies  

E-Print Network (OSTI)

A method for the palladium-catalyzed intramolecular Heck coupling of unactivated alkyl bromides and chlorides is described. The optimal catalyst system was composed of Pd2(MeO-dba)3 as the metal source and N-heterocyclic ...

Firmansjah, Luke

2007-01-01T23:59:59.000Z

259

Nickel-catalyzed Suzuki-Miyaura reactions of unactivated halides with alkyl boranes and planar-chiral borabenzene catalysts for Diels-Alder reactions  

E-Print Network (OSTI)

Part I describes the expansion in scope of a nickel-catalyzed coupling reaction of unactivated alkyl bromides and alkyl boranes to include unactivated alkyl chlorides. The new method is adapted for use outside of a glove ...

Lu, Zhe

2010-01-01T23:59:59.000Z

260

Development of novel transition metal-catalyzed cross-coupling reactions and applications thereof  

E-Print Network (OSTI)

Chapter 1 The first example of Pd(0)/(II) catalyzed fluorination of aryl bromides is reported herein. Based on these data, an analogous method was developed for the fluorination of aryl triflates. The reaction proceeds ...

Teverovskiy, Georgiy

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

MOLECULAR BEAM STUDIES OF UNIMOLECULAR REACTIONS: Cl, F + C2H3Br  

E-Print Network (OSTI)

pro~ of fluorine and chlorine atoms with vinyl bromide areheated nickle oven at The chlorine source was similar,the tot&l energy for the chlorine re&ction &nd FWHM ~ 4.2 kJ

Buss, Richard J.

2011-01-01T23:59:59.000Z

262

METHOD FOR THE PREPARATION OF PLUTONIUM HALIDES AND OXYHALIDES  

DOE Patents (OSTI)

Plutonium trihalide or plutonium(III) oxyhalide is prepared by reacting plutonium dioxide with hydrogen halide at 300 to 1000 deg C in the presence of hydrogen, ammonium iodide, or ammonium bromide.

Davidson, N.R.; Katz, J.J.

1960-02-23T23:59:59.000Z

263

W-7405-ENG-18 3-l-43  

Office of Legacy Management (LM)

the radium contained in this lot as radium bromide and resell it to African Metals at a price of 15.70mg. The Government had to exersige this sale option within 10 months after...

264

The contrastive research in the photocatalytic activity of BiOBr synthesized by different reactants  

Science Conference Proceedings (OSTI)

BiOBr nanoplates, marked as ?-BiOBr and ?-BiOBr, were synthesized via hydrothermal method using cetylpyridinium bromide (CPB) and NaBr as reactants, respectively. X-Ray Diffraction (XRD), transmission electron microscope (TEM), N2 ...

Wang Ling-Li; Ma Wan-Hong; Wang Shu-Lian; Zhang Yu; Jia Man-Ke; Li Rui-Ping; Zhang Ai-Qing; Huang Ying-Ping

2012-01-01T23:59:59.000Z

265

Investigation into Nanostructured Lanthanum Halides and CeBr{sub 3} for Nuclear Radiation Detection  

Science Conference Proceedings (OSTI)

This slide-show presents work on radiation detection with nanostructured lanthanum halides and CeBr{sub 3}. The goal is to extend the gamma energy response on both low and high-energy regimes by demonstrating the ability to detect low-energy x-rays and relatively high-energy activation prompt gamma rays simultaneously using the nano-structured lanthanum bromide, lanthanum fluoride, cerium bromide, or other nanocrystal material. Homogeneous and nano structure cases are compared.

Guss, P., Guise, R., Mukhopadhyay, S., Yuan, D.

2011-06-22T23:59:59.000Z

266

WET METHOD OF PREPARING PLUTONIUM TRIBROMIDE  

DOE Patents (OSTI)

S> The preparation of anhydrous plutonium tribromide from an aqueous acid solution of plutonium tetrabromide is described, consisting of adding a water-soluble volatile bromide to the tetrabromide to provide additional bromide ions sufficient to furnish an oxidation-reduction potential substantially more positive than --0.966 volt, evaporating the resultant plutonium tribromides to dryness in the presence of HBr, and dehydrating at an elevated temperature also in the presence of HBr.

Davidson, N.R.; Hyde, E.K.

1958-11-11T23:59:59.000Z

267

Epigenetic Mechanisms and Gene Networks in the Nervous System  

E-Print Network (OSTI)

(Miltenberger et al., 1997), and extensive variation in phenotype is produced by differential methylation

Champagne, Frances A.

268

Metal Catalyzed Formation of Aliphatic Polycarbonates Involving Oxetanes and Carbon Dioxide as Monomers  

E-Print Network (OSTI)

Biodegradable aliphatic polycarbonates are important components of non-toxic thermoplastic elastomers, which have a variety of medical applications. Industrially, aliphatic polycarbonates derived from six-membered cyclic carbonates such as trimethylene carbonate (TMC or 1,3-dioxan-2-one) are produced via ring-opening polymerization (ROP) processes in the presence of a tin catalyst. It is worth mentioning that TMC is readily obtained by transesterification of 1,3-propanediol with various reagents including phosgene and its derivatives. Therefore, it has been of great interest to investigate greener routes for the production of this important class of polymers. Toward this goal, the synthesis of aliphatic polycarbonates via the metal catalyzed alternative coupling of oxetanes and carbon dioxide represents an attractive alternative. The use of an abundant, inexpensive, non-toxic, and biorenewable resource, carbon dioxide, makes this method very valuable. Furthermore, in this reaction, the sixmembered cyclic carbonate byproduct, TMC, can also be ring-opened and transformed into the same polycarbonate. For over a decade, the Darensbourg research group has successfully utilized metal salen complexes as catalysts for the epoxide/CO2 copolymerization process. Hence, this dissertation focuses on the examination of these complexes as catalysts for the oxetane/CO2 copolymerization reaction and the further elucidation of its mechanism. Chromium(III) salen derivatives in the presence of an azide ion initiator were determined to be very effective catalysts for the coupling of oxetanes and carbon dioxide providing polycarbonates with minimal amounts of ether linkages. Kinetic and mechanistic investigations performed on this process suggested that copolymer formation proceeded by two routes. These are the direct enchainment of oxetane and CO2, and the intermediacy of trimethylene carbonate, which was observed as a minor product of the coupling reaction. Anion initiators which are good leaving groups, e.g. bromide and iodide, are effective at affording TMC, and hence, more polycarbonate can be formed by the ROP of preformed trimethylene carbonate. Research efforts at tuning the selectivity of the oxetane/CO2 coupling process for TMC and/or polycarbonate produced from the homopolymerization of preformed TMC have been performed using cobalt(II) salen derivatives along with anion initiators. Lastly, investigations of this process involving 3-methoxy-methyl-3-methyloxetane will be presented.

Moncada, Adriana I.

2010-05-01T23:59:59.000Z

269

Density functional theory (DFT) and ab initio molecular orbital calculations have been employed to determine the structures and energies of the isomers of the OH-toluene adduct, the methyl hydroxycyclohexadienyl radical, and their corresponding transitio  

NLE Websites -- All DOE Office Websites (Extended Search)

Laboratory Investigation of Organic Aerosol Formation from Aromatic Hydrocarbons (DOE Award No. DE-FG02-02ER63098) Prepared by Luisa T. Molina, Renyi Zhang and Mario J. Molina Our work for this DOE funded project includes: (1) measurements of the kinetics and mechanism of the gas-phase oxidation reactions of the aromatic hydrocarbons initiated by OH; (2) measurements of aerosol formation from the aromatic hydrocarbons; and (3) theoretical studies to elucidate the OH-toluene reaction mechanism using quantum-chemical and rate theories. (1) Measurements of Gas-Phase Kinetics and Mechanism Work has been accomplished to develop laboratory instrumentation to conduct kinetic and mechanistic measurements of the aromatic hydrocarbon reactions initiated by OH, using

270
271

Electrogenerated Chemiluminescence and Fluorescence Lifetime Spatial Heterogeneity of Poly (2-methoxy-5-(2-ethylhexyloxy)-1, 4-phenylenevinylene) in Presence of [6,6]-phenyl-C61-butyric Acid Methyl Ester  

SciTech Connect

In this paper, we studied the luminescence property and fluorescence lifetime mapping of MEH-PPV/PCBM system by using electrogenerated chemiluminescence (ECL) and time-correlated single photo counting (TC-SPC) technologies. The ECL results showed that the oxidation peak of MEH-PPV near 0.7 V (vs. SCE) and ECL response of films shifted positively towards 1.2 V when in the presence of PCBM. At the same time, the oxidation peak current density of MEH-PPV increases while the ECL response decreased with the loading of PCBM in the composite films. The fluorescence lifetime images clearly show that the lifetime fluctuation is effected by different substrates and MEH-PPV/PCBM ratios. Meanwhile, the lifetime of MEH-PPV decreases with the increasing of film thickness. The lifetimes of MEH-PPV films on TiO2 substrate are lower than them of films on cover slips.

Geng, Hongwei; Pan, Shanlin; Hu, Dehong

2013-04-01T23:59:59.000Z

273

Variable dimensionality in the uranium fluoride/2-methyl-piperazine system: Synthesis and structures of UFO-5, -6, and -7; Zero-, one-, and two-dimensional materials with unprecedented topologies  

SciTech Connect

Recently, low temperature (T < 300 C) hydrothermal reactions of inorganic precursors in the presence of organic cations have proven highly productive for the synthesis of novel solid-state materials. Interest in these materials is driven by the astonishingly diverse range of structures produced, as well as by their many potential materials chemistry applications. This report describes the high yield, phase pure hydrothermal syntheses of three new uranium fluoride phases with unprecedented structure types. Through the systematic control of the synthesis conditions the authors have successfully controlled the architecture and dimensionality of the phase formed and selectively synthesized novel zero-, one-, and two-dimensional materials.

Francis, R.J.; Halasyamani, P.S.; Bee, J.S.; O'Hare, D.

1999-02-24T23:59:59.000Z

274

Modelling and optimisation of batch distillation involving esterification and hydrolysis reaction systems. Modelling and optimisation of conventional and unconventional batch distillation process: Application to esterification of methanol and ethanol using acetic acid and hydrolysis of methyl lactate system.  

E-Print Network (OSTI)

??Batch distillation with chemical reaction when takes place in the same unit is referred to as batch reactive distillation process. The combination reduces the capital… (more)

Edreder, Elmahboub A.

2010-01-01T23:59:59.000Z

275
276

Annotated bibliography of research carried out from 1993 to 1999 under DoE Award No. DE-IA02-94ER14411: Spectroscopic investigation of the vibrational quasi-continuum arising from internal rotation of a methyl group  

DOE Green Energy (OSTI)

This report covers work carried out during a six year period under a DoE interagency grant. Because all results have been published as full papers in appropriate refereed journals that are openly available in most scientific libraries, the report takes the form of an annotated bibliography. In the interests of scientific continuity and bibliographic usefulness, however, work carried out on this same project from 1990-1992 under an earlier DoE award, as well as related work currently (2000-2002) in progress, will also be discussed. It should be stressed, however, that only work directly connected to the grantee is cited explicitly in this final grant report. The many important papers by other workers in the field during the last decade must be obtained from reference citations in the 21 publications mentioned.

Hougen, Jon T.

2002-03-04T23:59:59.000Z

277

Detailed chemical kinetic mechanism for the oxidation of biodiesel fuels blend surrogate.  

DOE Green Energy (OSTI)

Detailed chemical kinetic mechanisms were developed and used to study the oxidation of two large unsaturated esters: methyl-5-decenoate and methyl-9-decenoate. These models were built from a previous methyl decanoate mechanism and were compared with rapeseed oil methyl esters oxidation experiments in a jet stirred reactor. A comparative study of the reactivity of these three oxygenated compounds was performed and the differences in the distribution of the products of the reaction were highlighted showing the influence of the presence and the position of a double bond in the chain. Blend surrogates, containing methyl decanoate, methyl-5-decenoate, methyl-9-decenoate and n-alkanes, were tested against rapeseed oil methyl esters and methyl palmitate/n-decane experiments. These surrogate models are realistic kinetic tools allowing the study of the combustion of biodiesel fuels in diesel and homogeneous charge compression ignition engines.

Herbinet, O; Pitz, W J; Westbrook, C K

2009-07-21T23:59:59.000Z

278

Gas phase chromatography of halides of elements 104 and 105  

Science Conference Proceedings (OSTI)

On-line isothermal gas phase chromatography was used to study halides of {sup 261}104 (T{sub {1/2}} = 65 s) and {sup 262,263}105 (T{sub {1/2}} = 34 s and 27 s) produced an atom-at-a time via the reactions {sup 248}Cm({sup 18}O, 5n) and {sup 249}Bk({sup 18}O, 5n, 4n), respectively. Using HBr and HCl gas as halogenating agents, we were able to produce volatile bromides and chlorides of the above mentioned elements and study their behavior compared to their lighter homologs in Groups 4 or 5 of the periodic table. Element 104 formed more volatile bromides than its homolog Hf. In contrast, element 105 bromides were found to be less volatile than the bromides of the group 5 elements Nb and Ta. Both 104 and Hf chlorides were observed to be more volatile than their respective bromides. 31 refs., 8 figs.

Tuerler, A.; Gregorich, K.E.; Czerwinski, K.R.; Hannink, N.J.; Henderson, R.A.; Hoffman, D.C.; Kacher, C.D.; Kadkhodayan, B.; Kreek, S.A.; Lee, D.M.; Leyba, J.D.; Nurmia, M.J. (Lawrence Berkeley Lab., CA (United States)); Gaeggeler, H.W.; Jost, D.T.; Kovacs, J.; Scherer, U.W.; Vermeulen, D.; Weber, A. (Paul Scherrer Inst. (PSI), Villigen (Switzerland)); Barth, H.; Gober, M.K.; Kratz, J.V. (Philipps-Univ., Marburg

1991-04-01T23:59:59.000Z

279

Test report : Raytheon / KTech RK30 energy storage system.  

SciTech Connect

The Department of Energy Office of Electricity (DOE/OE), Sandia National Laboratories (SNL) and the Base Camp Integration Lab (BCIL) partnered together to incorporate an energy storage system into a microgrid configured Forward Operating Base to reduce the fossil fuel consumption and to ultimately save lives. Energy storage vendors will be sending their systems to SNL Energy Storage Test Pad (ESTP) for functional testing and then to the BCIL for performance evaluation. The technologies that will be tested are electro-chemical energy storage systems comprising of lead acid, lithium-ion or zinc-bromide. Raytheon/KTech has developed an energy storage system that utilizes zinc-bromide flow batteries to save fuel on a military microgrid. This report contains the testing results and some limited analysis of performance of the Raytheon/KTech Zinc-Bromide Energy Storage System.

Rose, David Martin; Schenkman, Benjamin L.; Borneo, Daniel R.

2013-10-01T23:59:59.000Z

280

Hydrophobic Polycationic Coatings Disinfect Poliovirus and Rotavirus Solutions  

E-Print Network (OSTI)

Coating surfaces with N-alkylated polyethylenimines (PEIs), namely branched N,N-hexyl,methyl-PEI via covalent attachment to glass or linear N,N-dodecyl,methyl-PEI by physical deposition (“painting”) onto polyethylene, ...

Larson, Alyssa Maxine

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

Fast and sensitive mapping of bisulfite-treated sequencing data  

Science Conference Proceedings (OSTI)

Motivation: Cytosine DNA methylation is one of the major epigenetic modifications and influences gene expression, developmental processes, X-chromosome inactivation, and genomic imprinting. Aberrant methylation is furthermore known to be associated ...

Christian Otto; Peter F. Stadler; Steve Hoffmann

2012-07-01T23:59:59.000Z

282

NIST: Freq. Interstellar Molec. Micro. Trans. - Table 1  

Science Conference Proceedings (OSTI)

... C 2 H 4 O 2, Methyl ester formic acid (methyl formate), CH 3 OCHO, [107-31-3], Bro75. C 2 H 4 O 2, Acetic acid, CH 3 COOH, [64-19-7], Meh97. ...

283

The role of the de novo DNA methyltransferase Dnmt3a in the nervous system  

E-Print Network (OSTI)

DNA methylation is an important mechanism of gene regulation. Evidence is mounting that epigenetic mechanisms including that of DNA methylation operate in the nervous system. Genetic disruption of the de novo DNA ...

Nguyen, Suzanne Pham

2007-01-01T23:59:59.000Z

284

Development of the dual-cycle absorption heat pump for residential application. Appendix B: Analysis of materials compatibility and corrosion for dual-cycle absorption heat pump. Final report, April 1984-March 1990  

SciTech Connect

Engineering alloys were analyzed in an effort to identify corrosion resistant materials for the absorption heat pump (AHP). Testing focused on the corrosion behavior of carbon steels and austentic stainless steels Types 304 and 316L. Most of the tests were conducted in lithium bromide solutions at various temperatures under non-flowing or static conditions. Failures due to corrosion in prototype AHP units were investigated as they occurred. A literature review was performed on the corrosion behavior of materials in lithium bromide, ammonia water, and calcium chloride environments. Material recommendations and heat treating procedures are discussed.

Not Available

1990-04-01T23:59:59.000Z

285

Sorbent Assisted Catalyst for the One-Pot Sequestration and Conversion of Renewable Feedstocks into Fuels  

algae oils, by not utilizing current methods of fatty acid conversion to methyl ester, makes this technology economically attractive.

286

Pramipexole effects on startle gating in rats and normal men  

E-Print Network (OSTI)

brain regional activity of catechol-O-methyl transferase (reflex depends on the catechol O-methyltransferase Val158Met

Swerdlow, Neal R.; Lelham, Sophia A.; Sutherland Owens, Ashley N.; Chang, Wei-Li; Sassen, Sebastiaan D.; Talledo, Jo A.

2009-01-01T23:59:59.000Z

287

unknown title  

E-Print Network (OSTI)

Combustion chemical kinetics of biodiesel and related compounds (methyl and ethyl esters): Experiments and modeling – Advances and future refinements

Lucie Coniglio; Hayet Bennadji; Pierre Alex; Re Glaude; Olivier Herbinet; Francis Billaud

2013-01-01T23:59:59.000Z

288

AMukhopadhyay_SIM2008_final.ppt  

NLE Websites -- All DOE Office Websites (Extended Search)

of mercury - Methyl mercury formation. * Biocorrosion * Biofouling of crude oil 2 Stored legacy waste Radioactive and heavy metal waste management...

289

7, 1164711683, 2007 VOC ratios as probes  

E-Print Network (OSTI)

chemistry, and [isobutane]/[n-butane] and [methyl ethyl ketone]/[n-5 butane] are used to study the extent

Paris-Sud XI, Université de

290

MOUSE ORGAN HARVEST PROTOCOL 10/01 TO FREEZE TISSUES FOR FROZEN SECTIONS  

E-Print Network (OSTI)

bits of dry ice and 2 methyl butane. This will be the freezing mixture which will freeze the organs OCT turns white 9. Remove plastic molds with frozen organs from dry ice/ 2 methyl butane and let them No 15160-215 3. Frozen sample write-on bags: VWR Cat. No: 01-002-37 4. 2 methyl butane: Fisher Cat. No

Abagyan, Ruben

291

The absorbent's solution flow process, non-parametric identification into an absorption chiller for air conditioning  

Science Conference Proceedings (OSTI)

The lithium bromide chillers supplied from solar collectors are used to provide proper environmental conditions into industrial and civil buildings. To maintain the appropriate values for the temperature into the chiller's boiler, a control unit is introduced ... Keywords: absorption chiller, flow process, system identification

Adrian Danila

2011-04-01T23:59:59.000Z

292

Nickel-Catalyzed Enantioselective Negishi Cross-Couplings of Racemic Secondary alpha-Bromo Amides with Alkylzinc Reagents: (S)-N-Benzyl-7-cyano-2-ethyl-N-phenylheptanamide  

E-Print Network (OSTI)

Procedure: A. (5-Cyanopentyl)zinc(II) bromide (1). An oven-dried, 200-mL pear-shaped Schlenk flask equipped with a magnetic stirbar (egg shaped, 25.4 × 12.7 mm) and an argon line connected to the standard taper outer joint ...

Lou, Sha

293

Synthesis and study of ligands for Pd-catalyzed C-O and C-N coupling  

E-Print Network (OSTI)

A new ligand, AdBrettPhos, was synthesized and its use, along with tBuBrettPhos, in C-O coupling reactions at low temperatures was investigated. Using Pd catalysts containing these ligands, electron-neutral aryl bromides ...

Davis, Nicole R

2009-01-01T23:59:59.000Z

294

Printed in the United States of America. Available from National Technical Information Service  

E-Print Network (OSTI)

environments, but it underwent stress corrosion cracking in oxygen- or chromate-containing lithium bromide CORROSION CRACKING TESTS IN LiBr-H 20 SOLUTION ...... 11 DISCUSSION AND CONCLUSIONSd METALS AND CERAMICS DIVISION CORROSION OF MATERIALS IN ABSORPTION HEATING AND REFRIGERATION FLUIDS

Oak Ridge National Laboratory

295

Polystyrene/montmorillonite nanocomposites: study of the morphology and effects of sonication time on thermal stability  

Science Conference Proceedings (OSTI)

Polymer nanocomposites of polystyrene matrix containing 10% wt of organo-montmorillonite (organo-MMT) were prepared using the solution method with sonication times of 0.5, 1, 1.5, and 2 hours. Cetyltrimethylammonium bromide (CTAB) is used to modify the ...

Mashael Alshabanat, Amal Al-Arrash, Waffa Mekhamer

2013-01-01T23:59:59.000Z

296

PHOTOGRAPHIC FILM DEVELOPER  

DOE Patents (OSTI)

S>An improved photographic developer is presented having very high energy development fine grain characteristics and a long shelf life. These characteristics are obtained by the use of aminoacetic acid in the developer, the other constituents of which are: sodium sulfite, hydroquinone, sodiunn borate, boric acid and potassium bromide, 1-phenyl-3-pyrazolidone.

Berry, F.G.

1958-06-24T23:59:59.000Z

297

Spatially non-uniform ground state and quantized vortices in a two-component  

E-Print Network (OSTI)

settings to residential and commercial use. The system features one assembly with a condenser the condenser. The water flow direction can be changed at run-time to optimize performance. Advantages ·· Energy. The system employs lithium bromide, which is now widely used in commercial air conditioning. In current

Demokritov, S.O.

298

Innovative On-site Integrated Energy System Tested World Renewable Energy Congress VIII  

E-Print Network (OSTI)

. Testing and verification of the skid-mounted design should lead to adoption of this system in commercial bromide. As the vapor condenses, chilled water is produced. This advanced double-effect chiller uses two building structures at a specific site while maintaining features, which optimize system performance

Oak Ridge National Laboratory

299

Responsive copolymers for enhanced petroleum recovery. Quarterly technical progress report, March 22, 1994--June 21, 1994  

SciTech Connect

In this report, the authors consider the synthesis of copolymers of interest in the enhanced recovery of petroleum. Acrylamide and N,N-dimethyl-N-dodecyl-N-(2-amidoethyl) ammonium bromide copolymers were synthesized and characterized by various instrumental methods. The rheological properties of this copolymer were investigated using a porous media elongation rheometer.

McCormick, C.; Hester, R.

1994-09-01T23:59:59.000Z

300

Mercury Control Update 2009  

Science Conference Proceedings (OSTI)

EPRI has been evaluating cost-effective methods for reducing mercury emissions from coal-fired power plants. This report summarizes the current status of mercury control technologies and offers detailed discussion of boiler bromide addition balance-of-plant impacts and activated carbon injection (ACI) tests at selected sites.

2009-12-14T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

PEER-REVIEW Stack Emissions and Ash Characterization Data  

E-Print Network (OSTI)

to develop effective Hg0 capture or oxidation technologies. In coal combustion flue gases, Hg0 is oxidized mercury in the gas phase upon introduction of KI, indicating that the oxidation product HgI2 was captured and hydrogen bromide gas16 to flue gas was demonstrated to enhance Hg0 oxidation, but the extent of enhancement

Columbia University

302

Mercury Emissions Control in Coal Combustion Systems Using Potassium Iodide: Bench-Scale and Pilot-Scale Studies  

E-Print Network (OSTI)

to develop effective Hg0 capture or oxidation technologies. In coal combustion flue gases, Hg0 is oxidized mercury in the gas phase upon introduction of KI, indicating that the oxidation product HgI2 was captured and hydrogen bromide gas16 to flue gas was demonstrated to enhance Hg0 oxidation, but the extent of enhancement

Li, Ying

303

Copyright 2010 Babcock Power Inc. All Rights Reserved Proceedings of the 18th Annual North American Waste-to-Energy Conference  

E-Print Network (OSTI)

to develop effective Hg0 capture or oxidation technologies. In coal combustion flue gases, Hg0 is oxidized mercury in the gas phase upon introduction of KI, indicating that the oxidation product HgI2 was captured and hydrogen bromide gas16 to flue gas was demonstrated to enhance Hg0 oxidation, but the extent of enhancement

Columbia University

304

FINALCOMMISSIONDECISION Application For Certification (08-AFC-1)  

E-Print Network (OSTI)

to develop effective Hg0 capture or oxidation technologies. In coal combustion flue gases, Hg0 is oxidized mercury in the gas phase upon introduction of KI, indicating that the oxidation product HgI2 was captured and hydrogen bromide gas16 to flue gas was demonstrated to enhance Hg0 oxidation, but the extent of enhancement

305

Capabilities  

Science Conference Proceedings (OSTI)

Table 1   Inorganic ions determined by ion chromatography...Barium Pyrophosphate Cobalt Chloride Borate Calcium Silicate Copper Cyanide Bromide Cesium Tripolyphosphate Gold Iodide Carbonate Lithium lridium Sulfide Chlorate Magnesium Iron(II,III) Chlorite Rubidium Lead Chromate Sodium Mercury Dithionite Strontium Nickel Fluoride Platinum Iodate Zinc Iodide...

306

The synthesis and lanthanide coordination chemistry of 2,6-bis[(dicyclohexyl)phosphino-methyl]pyridine N,P,P'-trioxide. The crystal structure of 2,6-bis[(dicyclohexyl)phosphinomethyl] pyridine N,P,P'-trioxide erbium(III) nitrate  

SciTech Connect

The title ligand is obtained in two steps with high overall yield, and is soluble in aromatic solvents, making its liquid-liquid extraction performance of potential interest. The ligand forms a stable 1:1 coordination complex with Er(NO3)3 and the molecular structure was determined by single crystal x-ray diffraction methods. The Er(III) ion is chelated by one tridentate ligand and three bidentate nitrate groups. The structural results are discussed in the context of complexes formed by related ligands.

Gan, Xinmin; Rapko, Brian M.; Duesler, E N.; Binyamin, Iris; Paine, Robert T.; Hay, Benjamin P.

2005-03-10T23:59:59.000Z

307

A proposed sensor deployment to investigate biogeochemical controls on mercury cycling in Mugu Lagoon, California (CON 5)  

E-Print Network (OSTI)

biogeochemical controls on mercury cycling in Mugu Lagoon,of UCLA, is impaired for mercury, a potent neurotoxin, whichhealth and wildlife t o •Mercury methylation is the process

Sarah Rothenberg; Jenny Jay

2006-01-01T23:59:59.000Z

308

PNNL: Available Technologies: Agriculture & Mining Industry  

Bio-based. Bio-based. Conversion of Levulinic Acid to Methyl Tetrahydrofuran; Building Efficiency. DSOM (Decision Support for Operations and ...

309

Novel Functionalized Nanomaterials for Organic Decontamination  

Science Conference Proceedings (OSTI)

... oxide (TiO2)-graphene-rhamnolipid for decontamination of organics (methyl orange, phenol and diesel) from water. The results show the advantage of organic ...

310

Impact of Renewable Fuels Standard/MTBE Provisions of S. 517 Requested by Sens. Daschle & Murkowski  

Reports and Publications (EIA)

Additional analysis of the impact of the Renewable Fuels Standard (RFS) and methyl tertiary butyl ether (MTBE) ban provisions of S. 517.

Information Center

2002-04-01T23:59:59.000Z

311

Impact of Renewable Fuels Standard/MTBE Provisions of S.1766  

U.S. Energy Information Administration (EIA)

SR/OIAF/2002-06 Release date: March 2002 This report analyzes the Renewable Fuels Standard (RFS)/methyl tertiary butyl ether (MTBE) provisions of S. 1766.

312

EA-1157: Final Environmental Assessment | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

EA-1157: Final Environmental Assessment Methyl Chloride via Oxyhydrochlorination of Methane: A Building Black for Chemicals and Fuels from Natural Gas This EA evaluates the...

313

Instrument Schedule for dcs  

Science Conference Proceedings (OSTI)

... Mon Mar 12 2007, 1, 7902, Rotational dynamics of methane in the zeolitic imidazolate framework ZIF8 and methane-methyl coupling (preliminary ...

314

Supercontiunuum FTIR  

Science Conference Proceedings (OSTI)

... Near-IR FT spectra of methane, shown in Figure 1, and methyl salicylate were acquired with both sources to demonstrate the reasonable spectral ...

2012-10-02T23:59:59.000Z

315

Instrument Schedule for dcs  

Science Conference Proceedings (OSTI)

... Thu May 10 2007, 4, 7902, Rotational dynamics of methane in the zeolitic imidazolate framework ZIF8 and methane-methyl coupling, Zhou*, Wu ...

316

Gas Metrology Group Homepage  

Science Conference Proceedings (OSTI)

... and the neurotoxic risk associated with trophic transfer of methyl mercury to humans, the reduction of mercury emissions from coal-fired electric … ...

2012-10-23T23:59:59.000Z

317

Prediction of epigenetically regulated genes in breast cancer cell lines  

Science Conference Proceedings (OSTI)

Methylation of CpG islands within the DNA promoter regions is one mechanism that leads to aberrant gene expression in cancer. In particular, the abnormal methylation of CpG islands may silence associated genes. Therefore, using high-throughput microarrays to measure CpG island methylation will lead to better understanding of tumor pathobiology and progression, while revealing potentially new biomarkers. We have examined a recently developed high-throughput technology for measuring genome-wide methylation patterns called mTACL. Here, we propose a computational pipeline for integrating gene expression and CpG island methylation profles to identify epigenetically regulated genes for a panel of 45 breast cancer cell lines, which is widely used in the Integrative Cancer Biology Program (ICBP). The pipeline (i) reduces the dimensionality of the methylation data, (ii) associates the reduced methylation data with gene expression data, and (iii) ranks methylation-expression associations according to their epigenetic regulation. Dimensionality reduction is performed in two steps: (i) methylation sites are grouped across the genome to identify regions of interest, and (ii) methylation profles are clustered within each region. Associations between the clustered methylation and the gene expression data sets generate candidate matches within a fxed neighborhood around each gene. Finally, the methylation-expression associations are ranked through a logistic regression, and their significance is quantified through permutation analysis. Our two-step dimensionality reduction compressed 90% of the original data, reducing 137,688 methylation sites to 14,505 clusters. Methylation-expression associations produced 18,312 correspondences, which were used to further analyze epigenetic regulation. Logistic regression was used to identify 58 genes from these correspondences that showed a statistically signifcant negative correlation between methylation profles and gene expression in the panel of breast cancer cell lines. Subnetwork enrichment of these genes has identifed 35 common regulators with 6 or more predicted markers. In addition to identifying epigenetically regulated genes, we show evidence of differentially expressed methylation patterns between the basal and luminal subtypes. Our results indicate that the proposed computational protocol is a viable platform for identifying epigenetically regulated genes. Our protocol has generated a list of predictors including COL1A2, TOP2A, TFF1, and VAV3, genes whose key roles in epigenetic regulation is documented in the literature. Subnetwork enrichment of these predicted markers further suggests that epigenetic regulation of individual genes occurs in a coordinated fashion and through common regulators.

Loss, Leandro A; Sadanandam, Anguraj; Durinck, Steffen; Nautiyal, Shivani; Flaucher, Diane; Carlton, Victoria EH; Moorhead, Martin; Lu, Yontao; Gray, Joe W; Faham, Malek; Spellman, Paul; Parvin, Bahram

2010-05-04T23:59:59.000Z

318

DIRECT ANALYSIS OF UNDILUTED PHOTORESIST WITH ...  

Science Conference Proceedings (OSTI)

... in-valve with syringe-driven diluent and internal standard streams before ... six potential contaminant elements in N-methyl-2-pyrrolidon were auto- ...

2013-03-29T23:59:59.000Z

319

Mercury uptake and dynamics in sea ice algae, phytoplankton and grazing copepods from a Beaufort Sea Arctic marine food web.  

E-Print Network (OSTI)

??Mercury (Hg) is one of the primary contaminants of concern in the Arctic marine ecosystem. Methyl Hg (MeHg) is known to biomagnify in food webs.… (more)

Burt, Alexis Emelia

2012-01-01T23:59:59.000Z

320

Chemical, biochemical and molecular genetic interrogation of biosynthetically robust marine cyanobacteria  

E-Print Network (OSTI)

transmethylation catalyzed by catechol O-methyltransferase."transfer catalyzed by catechol-O-methyl-transferase." J Amtransmethylation catalyzed by catechol O-methyltransferase."

Grindberg, Rashel Vina

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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.


321

Strategies and Technologies for Improving Air Quality Around Ports  

E-Print Network (OSTI)

methyl ester soybean oil/diesel fuel blends. Bioresour.T. , Hydrotreated vegetable oil as fuel for heavy dutywith residual fuel oils. Journal of Aerosol Science, 2002.

Khan, Mohammad Yusuf

2013-01-01T23:59:59.000Z

322

NIST Tech Beat - March 1, 2007  

Science Conference Proceedings (OSTI)

... Computer modeling rendition of the proposed carbon-fluorine bond-breaking macrocycle after reaction with a molecule of methyl fluoride (CH3F). ...

323

NIST Image Gallery: Image Details  

Science Conference Proceedings (OSTI)

... Computer modeling rendition of the proposed carbon-fluorine bond-breaking macrocycle after reaction with a molecule of methyl fluoride (CH3F). ...

324

BS-Seeker2: a versatile aligning pipeline for bisulfite sequencing data  

E-Print Network (OSTI)

RL: MethylCoder: software pipeline for bisulfite-treateda versatile aligning pipeline for bisulfite sequencing dataof BS Seeker, as a full pipeline for mapping bisulfite

2013-01-01T23:59:59.000Z

325

Site Navigation - Brookhaven National Laboratory — a passion for ...  

BSA 10-13: Direct determination of methylation of CpG dinucleotides. BNL Reference Number: BSA 10-13. Patent Status: Application Number 20120219942 was published on ...

326

Biogeochemistry of Isoprenoid Production and Anaerobic Hydrocarbon Biodgeradation.  

E-Print Network (OSTI)

??This dissertation is an exploration of microbial isoprenoid production and destruction by anaerobic hydrocarbon biodegradation. Isoprenoids are methyl-branched hydrocarbons, and include biomarkers from all three… (more)

Dawson, Katherine

2011-01-01T23:59:59.000Z

327

xml version="1.0" encoding="UTF-8"?>

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

Method for scavenging mercury  

SciTech Connect

Disclosed herein is a method for removing mercury from a gas stream comprising contacting the gas stream with a getter composition comprising bromine, bromochloride, sulphur bromide, sulphur dichloride or sulphur monochloride and mixtures thereof. In one preferred embodiment the getter composition is adsorbed onto a sorbent. The sorbent may be selected from the group consisting of flyash, limestone, lime, calcium sulphate, calcium sulfite, activated carbon, charcoal, silicate, alumina and mixtures thereof. Preferred is flyash, activated carbon and silica.

Chang, Shih-Ger (El Cerrito, CA); Liu, Shou-Heng (Kaohsiung, TW); Liu, Zhao-Rong (Beijing, CN); Yan, Naiqiang (Berkeley, CA)

2011-08-30T23:59:59.000Z

342

Method for scavenging mercury  

SciTech Connect

Disclosed herein is a method for removing mercury from a gas stream comprising contacting the gas stream with a getter composition comprising bromine, bromochloride, sulphur bromide, sulphur dichloride or sulphur monochloride and mixtures thereof. In one preferred embodiment the getter composition is adsorbed onto a sorbent. The sorbent may be selected from the group consisting of flyash, limestone, lime, calcium sulphate, calcium sulfite, activated carbon, charcoal, silicate, alumina and mixtures thereof. Preferred is flyash, activated carbon and silica.

Chang, Shih-ger (El Cerrito, CA); Liu, Shou-heng (Kaohsiung, TW); Liu, Zhao-rong (Beijing, CN); Yan, Naiqiang (Berkeley, CA)

2009-01-20T23:59:59.000Z

343

AN INVESTIGATION INTO THE PHARMACOLOGICAL PROPERTIES OF ANTI-IRRADIATION DRUGS. Progress Report. REDUCTION OF DIMETHYLSULFOXIDE TO DIMETHYLSULFIDE IN THE CAT  

SciTech Connect

Progress is reported in studies on the pharmacological properties of aminoethylisothiaronium bromide hydrobromide (AET) and dimethyl sulfoxide (DMSO) in mice and cats. The mechanisms of action of these radioprotective compounds were studied in an attempt to reduce their toxic effects when given to higher animals. Data are presented on the effects of AET on the central nervous system and the effects of DMSO on blood pressure, heart, respiration, gut mobility, and nervous system in the test animals. (C.H.)

DiStefano, V.F.

1964-02-10T23:59:59.000Z

344

Effects of Air Emissions Controls on Coal Combustion Products: Interim Data Report  

Science Conference Proceedings (OSTI)

The Electric Power Research Institute (EPRI) is collecting information describing the effects of air emissions controls on coal combustion products (CCPs) as they pertain to disposal and use. Specifically, data are being collected to assess the impacts of calcium bromide (CaBr2) addition to coal, refined coal, halogen injection in the boiler, brominated activated carbon injection (BrACI) in the flue gas, dry sorbent injection (DSI) in the flue gas, and flue gas desulfurization (FGD) ...

2013-12-18T23:59:59.000Z

345

Iron Corrosion Observations: Pu(VI)-Fe Reduction Studies  

Science Conference Proceedings (OSTI)

Iron and Pu Reduction: (1) Very different appearances in iron reaction products were noted depending on pH, brine and initial iron phase; (2) Plutonium was associated with the Fe phases; (3) Green rust was often noted at the higher pH; (4) XANES established the green rust to be an Fe2/3 phase with a bromide center; and (5) This green rust phase was linked to Pu as Pu(IV).

Reed, Donald T. [Los Alamos National Laboratory; Swanson, Juliet S. [Los Alamos National Laboratory; Richmann, Michael K. [Los Alamos National Laboratory; Lucchini, Jean-Francois [Los Alamos National Laboratory; Borkowski, Marian [Los Alamos National Laboratory

2012-09-11T23:59:59.000Z

346

Silver  

Science Conference Proceedings (OSTI)

Table 5   Corrosion resistance of silver in organic compounds...2 Benzaldehyde, pure and aqueous Boiling Benzene, pure Boiling <0.05 2 Benzotrifluoride, pure Boiling <0.05 2 Benzyl chloride, pure 180 355 <0.05 2 -bromoisovaleryl bromide, pure 100 212 <0.05 2 -bromoisovaleryl urea, pure Melting point <0.05 2 Butyl acetate, pure Boiling <0.05 2 Butyl alcohol,...

347

SOLERAS - Saudi University Solar Cooling Laboratories Project. Final report, project summary  

Science Conference Proceedings (OSTI)

Proposals for research on solar cooling are presented for four Saudi Arabian universities. The universities are the University of Petroleum and Minerals in Dhahran, King Saud University in Riyadh, King Abdulaziz University in Jeddah, and King Faisal University in Dammam. Topics researched include the Rankine cycle, passive solar cooling systems, a solar-powered lithium bromide-water absorption machine and a photovoltaic-powered thermoelectric cooling machine. (BCS)

Not Available

1986-01-01T23:59:59.000Z

348

Calix[4]pyrrole: A New Ion-Pair Receptor As Demonstrated by Liquid-Liquid Extraction  

SciTech Connect

Solvent-extraction studies provide confirming evidence that meso-octamethylcalix[4]pyrrole acts as an ion-pair receptor for cesium chloride and cesium bromide in nitrobenzene solution. The stoichiometry of the interaction under extraction conditions from water to nitrobenzene was determined from plots of the cesium distribution ratios vs cesium salt and receptor concentration, indicating the formation of an ionpaired 1:1:1 cesium:calix[4]pyrrole:halide complex. The extraction results were modeled to evaluate the equilibria inherent to the solvent-extraction system, with either chloride or bromide. The binding energy between the halide anion and the calix[4]pyrrole was found to be about 7 kJ/mol larger for cesium chloride than for the cesium bromide. The ion-pairing free energies between the calix[4]pyrrole-halide complex and the cesium cation are nearly the same within experimental uncertainty for either halide, consistent with a structural model in which the Cs+ cation resides in the calix bowl. These results are unexpected since nitrobenzene is a polar solvent that generally leads to dissociated complexes in the organic phase when used as a diluent in extraction studies of univalent ions. Control studies involving nitrate revealed no evidence of ion pairing for CsNO3 under conditions identical to those where it is observed for CsCl and CsBr.

Wintergerst, Mr. Matthieu [Ecole Nationale Superieure de Chimie de Paris; Levitskaia, Tatiana G. [Pacific Northwest National Laboratory (PNNL); Moyer, Bruce A [ORNL; Sessler, Jonathan L. [University of Texas; Delmau, Laetitia Helene [ORNL

2008-01-01T23:59:59.000Z

349

Calix[4]pyrrole: A New Ion-Pair Receptor As Demonstrated by Liquid-Liquid Extraction  

SciTech Connect

Solvent extraction studies provide confirming evidence that meso-octamethylcalix[4]pyrrole acts as an ion-pair receptor for cesium chloride and cesium bromide in nitrobenzene solution. The stoichiometry of the interaction under extraction conditions from water to nitrobenzene was determined from plots of the cesium distribution ratios vs. cesium salt and receptor concentration, indicating the formation of an ion-paired 1:1:1 cesium:calix[4]pyrrole:halide complex. The extraction results were modeled to evaluate the equilibria inherent to the solvent extraction system, either with chloride or bromide. The binding energy between the halide anion and the calix[4]pyrrole was found to be about 7 kJ/mol larger for cesium chloride than for the cesium bromide. The ion-pairing free energies between the calix[4]pyrrole-halide complex and the cesium cation are nearly the same within experimental uncertainty for either halide, consistent with a structural model in which the Cs+ cation resides in the calix bowl. These results are unexpected since nitrobenzene is a very polar solvent that generally leads to dissociated complexes in the organic phase when used as a diluent in extraction studies of univalent ions. Control studies involving nitrate revealed no evidence of ion-pairing for CsNO3 under conditions identical to those where it is observed for CsCl and CsBr.

Wintergerst, Mr. Matthieu [Ecole Nationale Superieure de Chimie de Paris; Levitskaia, Tatiana G. [Pacific Northwest National Laboratory (PNNL); Moyer, Bruce A [ORNL; Sessler, Jonathan L. [University of Texas; Delmau, Laetitia Helene [ORNL

2008-01-01T23:59:59.000Z

350

The Sulfate-Reducing Bacterium Desulfovibrio desulfuricans ND132 as a Model for Understanding Bacterial Mercury  

E-Print Network (OSTI)

Bacterial Mercury Methylation Contact: Cynthia Gilmour (gilmourc@si.edu, 443-482-2498) DOE/Office of Science Contact: Cynthia Gilmour (gilmourc@si.edu, 443-482-2498) DOE/Office of Science/Biological & Environmental/Biological & Environmental Research ·The ORNL Mercury Science Focus Area is developing the Hg-methylating bacterium

351

BRANCHED ALKANES FROM BLUE-GREEN ALGAE  

DOE Green Energy (OSTI)

Branched alkanes from blue-green algae were separated on a 750 feet high resolution capillary gas chromatographic column. The mixture was found to be 90% of 1:1 ratio 7-methyl, and 8-methyl-heptadecane, and 10% of 6-methylheptadecane. An optical rotation of +2.5 {+-} 0.5 was obtained on a 5 mg of mixture.

Han, Jerry; Calvin, Melvin.

1970-08-01T23:59:59.000Z

352

Cell Stem Cell, Volume 12 Supplemental Information  

E-Print Network (OSTI)

E. Jacobsen, Matteo Pellegrini and Amander T. Clark #12;Figure S1. DNA Methylation in PGCs and iPGCs somatic cells from e10.5 embryos (D) and iPGCs (E). The xaxis denotes individual CpG dinucleotides of differentiation, showing gating strategy for SSEA1+/cKitbright iPGCs (green). G: Metaplot of methylation

Jacobsen, Steve

353

Ultrafine PMMA(QDs)/PVDF core-shell fibers for nanophotonic applications  

Science Conference Proceedings (OSTI)

Ultrafine fibers of poly(methyl methacrylate) (PMMA)/poly(vinylidene fluoride) (PVDF) with unique core-shell structure were fabricated via facile electrospinning method, and were adopted as waveguide materials. PMMA, into which CdSe/ZnS quantum dots ... Keywords: CdSe/ZnS, Core-shell fiber, Electrospinning, Poly(methyl methacrylate) (PMMA), Poly(vinylidene fluoride) (PVDF), Quantum dots

Shi-Li Quan; Hyun-Sik Lee; El-Hang Lee; Kyoung-Duck Park; Seung Gol Lee; In-Joo Chin

2010-05-01T23:59:59.000Z

354

MPP8 mediates the interactions between DNA methyltransferase Dnmt3a and H3K9 methyltransferase GLP/G9a  

SciTech Connect

DNA CpG methylation and histone H3 lysine 9 (H3K9) methylation are two major repressive epigenetic modifications, and these methylations are positively correlated with one another in chromatin. Here we show that G9a or G9a-like protein (GLP) dimethylate the amino-terminal lysine 44 (K44) of mouse Dnmt3a (equivalent to K47 of human DNMT3A) in vitro and in cells overexpressing G9a or GLP. The chromodomain of MPP8 recognizes the dimethylated Dnmt3aK44me2. MPP8 also interacts with self-methylated GLP in a methylation-dependent manner. The MPP8 chromodomain forms a dimer in solution and in crystals, suggesting that a dimeric MPP8 molecule could bridge the methylated Dnmt3a and GLP, resulting in a silencing complex of Dnmt3a-MPP8-GLP/G9a on chromatin templates. Together, these findings provide a molecular explanation, at least in part, for the co-occurrence of DNA methylation and H3K9 methylation in chromatin.

Chang, Yanqi; Sun, Lidong; Kokura, Kenji; Horton, John R.; Fukuda, Mikiko; Espejo, Alexsandra; Izumi, Victoria; Koomen, John M.; Bedford, Mark T.; Zhang, Xing; Shinkai, Yoichi; Fang, Jia; Cheng, Xiaodong (Moffitt); (Emory-MED); (Kyoto); (Texas)

2011-11-30T23:59:59.000Z

355

Bacterial Genetics and Molecular Biology -a Genomics Perspective (Ch. 1) Trudy M. Wassenaar, David W. Ussery Chapter 1. What is DNA?  

E-Print Network (OSTI)

more complex atoms to be stable. Eventually, atoms began to clump and condense due to gravity, causing in E. coli are called Dam (for DNA adenine methylase) and Dcm (DNA cytosine methylase). Not every group is sequence-dependent. Dam methylates the A in the sequence GATC and Dcm methylates the first C

Ussery, David W.

356

Interstellar Isomers: The Importance of Bonding Energy Differences  

E-Print Network (OSTI)

We present strong detections of methyl cyanide, vinyl cyanide, ethyl cyanide and cyanodiacetylene molecules with the Green Bank Telescope (GBT) toward the Sgr B2(N) molecular cloud. Attempts to detect the corresponding isocyanide isomers were only successful in the case of methyl isocyanide for its J(K)=1(0)-0(0) transition, which is the first interstellar report of this line. To determine the spatial distribution of methyl isocyanide, we used archival Berkeley-Illinois-Maryland Association (BIMA) array data for the J(K)=4(K)-3(K) (K=0-3) transitions but no emission was detected. From ab initio calculations, the bonding energy difference between the cyanide and isocyanide molecules is >8500 cm^-1 (>12,000 K). That we detect methyl isocyanide emission with a single antenna (Gaussian beamsize(Omega_B)=1723 arcsec^2) but not with an interferometer (Omega_B=192 arcsec^2), strongly suggests that methyl isocyanide has a widespread spatial distribution toward the Sgr B2(N) region. Thus, large-scale, non-thermal processes in the surrounding medium may account for the conversion of methyl cyanide to methyl isocyanide while the LMH hot core, which is dominated by thermal processes, does not produce a significant amount of methyl isocyanide. Ice analog experiments by other investigators have shown that radiation bombardment of methyl cyanide can produce methyl isocyanide, thus supporting our observations. We conclude that isomers separated by such large bonding energy differences are distributed in different interstellar environments, making the evaluation of column density ratios between such isomers irrelevant unless it can be independently shown that these species are co-spatial.

Anthony J. Remijan; J. M. Hollis; F. J. Lovas; D. F. Plusquellic; P. R. Jewell

2005-06-21T23:59:59.000Z

357

List of Reproductive Toxins and Highly Acute Toxic Materials  

NLE Websites -- All DOE Office Websites (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

358

Send Orders of Reprints at reprints@benthamscience.net 226 Current Computer-Aided Drug Design, 2013, 9, 226-232  

E-Print Network (OSTI)

. Consider the molecular graph of 2-methyl butane, with the vertex labelling as shown in Fig. (1). Fig. (1). The molecular graph of 2-methyl butane (CAS 78-78-4). The adjacency matrix A(G) and the distance matrix D(G) of 2-methyl butane are: A(G) D(G) 1 2 3 4 5 1 0 1 0 0 0 2 1 0 1 0 1 3 0 1 0 1 0 4 0 0 1 0 0 5 0 1 0 0 0

Gini, Giuseppina

359

Reversibly Bound Chloride in the Atrial Natriuretic Peptide Receptor Hormone Binding Domain: Possible Allosteric Regulation and a Conserved Structural Motif for the Chloride-binding Site  

SciTech Connect

The binding of atrial natriuretic peptide (ANP) to its receptor requires chloride, and it is chloride concentration dependent. The extracellular domain (ECD) of the ANP receptor (ANPR) contains a chloride near the ANP-binding site, suggesting a possible regulatory role. The bound chloride, however, is completely buried in the polypeptide fold, and its functional role has remained unclear. Here, we have confirmed that chloride is necessary for ANP binding to the recombinant ECD or the full-length ANPR expressed in CHO cells. ECD without chloride (ECD(-)) did not bind ANP. Its binding activity was fully restored by bromide or chloride addition. A new X-ray structure of the bromide-bound ECD is essentially identical to that of the chloride-bound ECD. Furthermore, bromide atoms are localized at the same positions as chloride atoms both in the apo and in the ANP-bound structures, indicating exchangeable and reversible halide binding. Far-UV CD and thermal unfolding data show that ECD(-) largely retains the native structure. Sedimentation equilibrium in the absence of chloride shows that ECD(-) forms a strongly associated dimer, possibly preventing the structural rearrangement of the two monomers that is necessary for ANP binding. The primary and tertiary structures of the chloride-binding site in ANPR are highly conserved among receptor-guanylate cyclases and metabotropic glutamate receptors. The chloride-dependent ANP binding, reversible chloride binding, and the highly conserved chloride-binding site motif suggest a regulatory role for the receptor bound chloride. Chloride-dependent regulation of ANPR may operate in the kidney, modulating ANP-induced natriuresis.

Ogawa, H.; Qiu, Y; Philo, J; Arakawa, T; Ogata, C; Misono, K

2010-01-01T23:59:59.000Z

360

Production of hydrobromic acid from bromine, methane and steam for hydrogen production. 1997 annual report, December 15, 1996--January 31, 1998  

DOE Green Energy (OSTI)

The solar-driven reaction between bromine and steam was studied. The goal was to make hydrobromic acid for hydrogen production and energy storage use via a reversible, high efficiency hydrogen/bromine fuel cell. While the reaction was technically successful and was demonstrated at NREL, it was determined to be uneconomical in today`s economy due to present high capital costs of the solar hardware. In an effort to provide for an interim process that can be utilized to produce hydrogen and store energy until the cost of solar hardware decreases, SRT`s process was modified to include the addition of methane. The new concept entails (i) reaction of bromine with methane and steam to produce hydrogen bromide and carbon dioxide and (ii) electrolysis of the stored hydrogen bromide for production of H{sub 2(g)} and recovery of Br{sub 2(1)}. Electrolyzers are available today for the electrolysis of HBr. In addition, a vendor for a reversible H{sub 2}-Br{sub 2} fuel has been identified. Most components of the envisioned system are commercially available. At present, the reactor needs the most development. In the SRT process, the electrical power required to split water is reduced effectively in half by the production of hydrogen bromide. The SRT concept is very attractive from an economic viewpoint as well. A reversible electrolytic fuel cell employed in the SRT process is capitalized via its use in load leveling by the utility. Thus, the price of SRT-produced hydrogen reflects only the cost of methane, reactor system capital costs and off-peak electrical power.

NONE

1998-07-17T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

The Risk Assessment Information System  

NLE Websites -- All DOE Office Websites (Extended Search)

Condensed Toxicity Summary for METHYL MERCURY Condensed Toxicity Summary for METHYL MERCURY 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. FEBRUARY, 1992 Prepared by: Robert A. Young, Ph.D., D.A.B.T., Chemical Hazard Evaluation and Communication Group Biomedical and Environmental Information Analysis Section, Health and Safety Research Division, *, Oak Ridge, Tennessee. Prepared for: Oak Ridge Reservation Environmental Restoration Program. *Managed by Martin Marietta Energy Systems, Inc., for the U.S. Department of Energy under Contract No. DE-AC05-84OR21400. Methyl mercury is formed by biotic and abiotic methylation of mercury

362

Infrared absorption measurements of the kinetics of Cl atom reactions with C{sub 3}H{sub n} (n=4,6) unsaturated hydrocarbons between 300-850 K  

Science Conference Proceedings (OSTI)

The reaction of chlorine (Cl) atoms with the unsaturated C{sub 3}H{sub n} where n=4,6, hydrocarbons propylene, allene, and methyl acetylene have been uninvestigated as a function of temperature and pressure.

Farrell, J.T.; Pilgrim, J.S.; Taatjes, C.A.

1997-08-01T23:59:59.000Z

363

Mercury, Cadmium and Lead Biogeochemistry in the Soil–Plant–Insect System in Huludao City  

E-Print Network (OSTI)

YE, Ketris MP (2005a) Mercury in coal: a review part 1of total and methyl mercury by arthropods. Bull Environ259 DOI 10.1007/s00128-009-9688-6 Mercury, Cadmium and Lead

Zhang, Zhong-Sheng; Lu, Xian-Guo; Wang, Qi-Chao; Zheng, Dong-Mei

2009-01-01T23:59:59.000Z

364

AOCS Official Method Ce 2-66  

Science Conference Proceedings (OSTI)

Preparation of Methyl Esters of Fatty Acids AOCS Official Method Ce 2-66 Methods Methods and Analyses Analytical Chemistry Methods Downloads Methods Downloads DEFINITION This method provides a means for prepari

365

AOCS Official Method Ch 1-91  

Science Conference Proceedings (OSTI)

Preparation of Methyl Esters of Long-Chain Fatty Acids AOCS Official Method Ch 1-91 Methods Methods and Analyses Analytical Chemistry Methods Downloads Methods Downloads DEFINITION This method provides a means

366

Biodiesel | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

fatty acid methyl esters, or long-chain mono alkyl esters. It is produced from renewable sources such as new and used vegetable oils and animal fats and is a cleaner-burning...

367

Gulf Coast (PADD 3) Exports of Crude Oil and Petroleum Products  

U.S. Energy Information Administration (EIA)

Area: Period-Unit: Download Series History ... 51: 64: 59: 70: 70: 62: 2009-2013: Methyl Tertiary Butyl Ether (MTBE) 41: 44: 49: 61: 49: 50: 2004-2013: Other ...

368

U.S. Oxygenate Production - Energy Information Administration  

U.S. Energy Information Administration (EIA)

Area: Apr-13 May-13 Jun-13 Jul-13 Aug-13 Sep-13 View History; Fuel Ethanol: 855: 877: 891: 868: 849: 852: 1981-2013: Methyl Tertiary Butyl Ether (MTBE) 48: 55: 54: 51 ...

369

Different Roles for Tet1 and Tet2 Proteins in Reprogramming-Mediated Erasure of Imprints Induced by EGC Fusion  

E-Print Network (OSTI)

Genomic imprinting directs the allele-specific marking and expression of loci according to their parental origin. Differential DNA methylation at imprinted control regions (ICRs) is established in gametes and, although ...

Piccolo, Francesco M.

370

Index of /ftp/ale_gage_Agage  

NLE Websites -- All DOE Office Websites (Extended Search)

began in 1978 using Hewlett-Packard (HP) 5840 gas chromatographs (gc) with an electron-capture detector (ECD) to measure five species (CFC-11 (CCl3F), CFC-12 (CCl2F2), methyl...

371

AOCS Official Method Ca 14b-96  

Science Conference Proceedings (OSTI)

Quantification of Free Glycerin in Selected Glycerides and Fatty Acid Methyl Esters by HPLC with Laser Light-Scattering Detection AOCS Official Method Ca 14b-96 Methods Methods and Analyses Analytical Chemistry Methods Downloads Methods Downloads ...

372

Radiation Chemistry of MTBE in Aqueous Solution  

NLE Websites -- All DOE Office Websites (Extended Search)

Methyl-tert-Butyl Ether (MTBE) in Aqueous Solution Stephen P. Mezyk, Jace Jones, William J. Cooper, Thomas Tobien, Michael G. Nickelsen, J. Wesley Adams, Kevin E. O'Shea, David M....

373

Microsoft Word - Transportation pdf.doc  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Finnish homes 0.23 to 0.86 Christensen and Mustonen, 1987 Various radioisotopes Danish home 0.1 to 0.5 Roed and Cannell, 1987 Noble gGases, methyl iodide, elemental iodine,...

374

Proposed Identification of Environmental Tobacco Smoke as a Toxic Air Contaminant, Part C: Public Comments and ARB/OEHHA Staff Responses  

E-Print Network (OSTI)

1B1, sulfotransferase 1A1, catechol-o-methyltransferase andphenol, the cresols, 2,4-dimethyl phenol, catechol, andthe methyl catechols, all of which have some carcinogenic

California Environmental Protection Agency: Air Resources Board

2005-01-01T23:59:59.000Z

375

Comparison of etch characteristics of KOH, TMAH and EDP for bulk micromachining of silicon (110)  

Science Conference Proceedings (OSTI)

Bulk micromachining in Si (110) wafer is an essential process for fabricating vertical microstructures by wet chemical etching. We compared the anisotropic etching properties of potassium hydroxide (KOH), tetra-methyl ammonium hydroxide (TMAH) and ethylene ...

Shankar Dutta; Md Imran; P. Kumar; R. Pal; P. Datta; R. Chatterjee

2011-10-01T23:59:59.000Z

376

AOCS Official Method Ae 4-52  

Science Conference Proceedings (OSTI)

Free Fatty Acids AOCS Official Method Ae 4-52 Methods Methods and Analyses Analytical Chemistry Methods Downloads DEFINITION This method determines the free fatty acids in oil removed from the seed by methyl alc

377

Chemical Resistance Chart  

Science Conference Proceedings (OSTI)

... 0. 53. Ethylene Oxide, 21, 4, 17, 5, 1, 5, 1, 5, 189, 2, 48, 4. 54. Hydrogen Fluoride, 210, 2, 1, 5, 142, 1, 1, 5, ND, 0, 6, 3. 55. Methyl Chloride, ...

378

Study of intermediates from transition metal excited-state electron-transfer reactions. Progress report, April 1, 1984-March 31, 1985. [EDTA-radicals  

DOE Green Energy (OSTI)

Excited-state inter- and intramolecular electron-transfer reactions lie at the heart of most photochemical solar energy conversion schemes. Our research, which utilizes the techniques of continuous and pulsed photolysis and radiolysis, has focused on three general aspects of these reactions involving transition metal coordination complexes and electron donor-acceptor complexes: (1) the effect of solution medium on the properties and quenching of the excited states; (2) the control of the quantum yield of formation of redox products; and (3) the mechanisms by which reduced species interact with water to yield H/sub 2/ homogeneously and heterogeneously. Research activities are summarized for the following: (1) reaction of methyl viologen with EDTA-radicals; (2) solution medium control of photoredox yields; (3) photochemistry of methyl viologen charge-transfer complexes; (4) thermal reduction of methyl viologen in alkaline solution; (5) formation of dihydrogen from reduced methyl viologen; and (6) photophysics of Cr(III)-polypyridyl complexes.

Hoffman, M.Z.

1985-03-31T23:59:59.000Z

379

Site Navigation - Brookhaven National Laboratory — a passion for ...  

BSA 11-19: Methyl CpG Detection using McrA. BNL Reference Number: BSA 11-19. Patent Status: U.S. Patent Number 8,263,742 was issued on September 11, 2012

380

Energy Basics: Biofuels  

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

The biomass-derived ethyl or methyl esters can be blended with conventional diesel fuel or used as a neat fuel (100% biodiesel). Learn more about biodiesel basics. Biofuel...

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

Performance degradation of P3HT:PCBM Polymer/fullerene photovoltaic cells under gamma irradiation.  

E-Print Network (OSTI)

??The gamma radiation damage effect on polymer-based hybrid photovoltaic cells consisting of a blend of poly-3-hexylthiophene (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is investigated.… (more)

Todd, Aaron

2009-01-01T23:59:59.000Z

382

INNOVATIVE EXPERIMENTAL SETUP FOR THE PARALLEL OPERATION OF MULTIPLE BENCH SCALE BIOTRICKLING FILTERS FOR WASTE AIR TREATMENT  

E-Print Network (OSTI)

and methyl isobutyl ketone (MIBKI vapors in air during passage through compost-based biofilters served an equivolume mixture of compost and polystyrene spheres. Acid-neutralizing components (probably limestone) were

383

Biochemical characterization of the E. coli Very Short Patch Repair pathway and its coordination with methyltransferase repair of 0?-methylguanine  

E-Print Network (OSTI)

The E. coli Very Short Patch Repair (VSPR) system corrects T:G mismatches that arise through Dcm-mediated methylation and subsequent deamination of the underlined cytosine residue in the palindromic sequence 5'-CCWGG-3' ...

Rye, Peter Thomas

2006-01-01T23:59:59.000Z

384

Green chemistry : dense carbon dioxide and water as environmentally benign reaction media  

E-Print Network (OSTI)

(cont.) was investigated in scCO?, and the cycloaddition between cyclopentadiene and methyl vinyl ketone (MVK) was studied in an scCO?/liquid water environment. Nitrogen chemistry, specifically the synthesis of nitrogen ...

Allen, Andrew J. (Andrew John), 1978-

2004-01-01T23:59:59.000Z

385

/sup 29/Si NMR study of the surface of pyrogenic silica modified by methylchlorosilanes  

SciTech Connect

Cross-polarization /sup 29/Si NMR spectra have been used for aerosil modified by methyl-chlorosilanes to identify surface organosilicon compounds and their reactions during hydrolysis and methanolysis.

Brie, V.V.; Gorlov, Yu.I.; Chuiko, A.A.

1986-11-01T23:59:59.000Z

386

Thermodynamics of the Densification Process for Polymer ...  

Science Conference Proceedings (OSTI)

... According to Price [7], very little change in the enthalpy of poly(methyl methacrylate) is ob- served up to about 800 ... Pv/t = [i - 2-1/6r(rV0"1/3]~1 . . (9) ...

2006-03-20T23:59:59.000Z

387

Optimal estimation of the surface fluxes of chloromethanes using a 3-D global atmospheric chemical transport  

E-Print Network (OSTI)

The four chloromethanes - methyl chloride (CH3Cl), dichloromethane (CH2Cl2), chloroform (CHCl3), and carbon tetrachloride (CCl4), are chlorine-containing gases contributing significantly to stratospheric ozone depletion ...

Xiao, Xue, Ph. D. Massachusetts Institute of Technology

2008-01-01T23:59:59.000Z

388

Presentation and accessibility of surface bound ligands on amphiphilic graft copolymer films  

E-Print Network (OSTI)

Amphiphilic comb-type graft copolymers comprising a poly(methyl methacrylate) (PMMA) backbone and short, polyethylene oxide (PEO) side chains, PMMA-g-PEO, are proposed to self-organize at the polymer/water interface, ...

Kuhlman, William A

2007-01-01T23:59:59.000Z

389

The applications of comb polymer to the study of liver cell adhesion and signaling  

E-Print Network (OSTI)

Comb polymer, which consists of a hydrophobic poly(methyl methacrylate) (PMMA) backbone with hydrophilic hydroxy-poly(ethylene oxide) (HPOEM) side chains, is a tool that has many possible applications for the study of liver ...

Yin, David, 1973-

2004-01-01T23:59:59.000Z

390

Compositions of alkyl 4-[o-(substituted amino)phenyl]-3-thioallophanates and methods of use  

DOE Patents (OSTI)

Various alkyl 4-[o-(substituted amino)phenyl]-3-thioallophanates are useful as fungicides and mite ovicides. An exemplary specie is methyl 4-(o-butyramidophenyl)-3-thioallophanate.

Adams, Charles De Witt (Newark, DE)

1977-03-01T23:59:59.000Z

391

AOCS Official Method Ce 1-62  

Science Conference Proceedings (OSTI)

Fatty Acid Composition by Packed Column Gas Chromatography AOCS Official Method Ce 1-62 Methods Methods and Analyses Analytical Chemistry Methods Downloads Methods Downloads DEFINITION Methyl esters of fatty ac

392

An engineered split M.HhaI-zinc finger fusion lacks the intended methyltransferase specificity  

SciTech Connect

The ability to site-specifically methylate DNA in vivo would have wide applicability to the study of basic biomedical problems as well as enable studies on the potential of site-specific DNA methylation as a therapeutic strategy for the treatment of diseases. Natural DNA methyltransferases lack the specificity required for these applications. Nomura and Barbas [W. Nomura, C.F. Barbas 3rd, In vivo site-specific DNA methylation with a designed sequence-enabled DNA methylase, J. Am. Chem. Soc. 129 (2007) 8676-8677] have reported that an engineered DNA methyltransferase comprised of fragments of M.HhaI methyltransferase and zinc finger proteins has very high specificity for the chosen target site. Our analysis of this engineered enzyme shows that the fusion protein methylates target and non-target sites with similar efficiency.

Meister, Glenna E. [Department of Chemical and Biomolecular Engineering, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218 (United States); Chandrasegaran, Srinivasan [Department of Environmental Health Sciences, Bloomberg School of Public Health, Johns Hopkins University, 615 North Wolfe Street, Baltimore, MD 21205 (United States); Ostermeier, Marc [Department of Chemical and Biomolecular Engineering, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218 (United States)], E-mail: oster@jhu.edu

2008-12-05T23:59:59.000Z

393

NIST Recommended Rest Frequencies for Observed ...  

Science Conference Proceedings (OSTI)

... methyl formate C2H4O2 Acetic acid CH3COOH 64-19-7 Meh97 C2H4O2 Hydroxyacetaldehyde CH2OHCHO 141-46-8 Hol00 ...

2008-06-09T23:59:59.000Z

394

Ozone-initiated chemistry in an occupied simulated aircraft cabin  

NLE Websites -- All DOE Office Websites (Extended Search)

nonanal, decanal, 4-oxopentanal (4-OPA), 6-methyl-5-hepten-2-one (6-MHO), formic acid and acetic acid, with 0.25 to 0.30 moles of quantified product volatilized per mole of ozone...

395

Method for the Collection and HPLC Analysis of Hydrogen Peroxide and Cl and C2 Hydroperoxides in the Atmosphere  

Science Conference Proceedings (OSTI)

An HPLC (high-performance liquid chromatography) method was developed to quantify hydrogen peroxide, methyl hydroperoxide. Hydroxymethyl hydroperoxide, ethyl hydroperoxide, and peroxyaectic acid in the atmosphere. Gas-phase hydroperoxides are ...

Meehye Lee; Birgitta C. Noone; Daniel O'sullivan; Brian G. Heikes

1995-10-01T23:59:59.000Z

396

Phosphorylation of MeCP2 at Serine 80 regulates its chromatin association and neurological function  

E-Print Network (OSTI)

Mutations of MECP2 (Methyl-CpG Binding Protein 2) cause Rett syndrome. As a chromatin-associated multifunctional protein, how MeCP2 integrates external signals and regulates neuronal function remain unclear. Although ...

Tao, Jifang

397

The Bimodal Energy Landscape When Polymers Adsorb Hildegard M. Schneider, Peter Frantz, and Steve Granick*  

E-Print Network (OSTI)

of conformational substates in a model system (poly(methyl methacrylate) adsorbed primarily by hydrogen bonding onto and its potential breakdown at the molecular level has been emphasized on theoretical grounds.5

Granick, Steve

398

Quantifying the health and economic impacts of mercury : an integrated assessment approach  

E-Print Network (OSTI)

Mercury is a toxic pollutant that endangers human and ecosystem health. Especially potent in the form of methyl mercury, exposure is known to lead to adverse neurological effects, and, a growing body of evidence suggests, ...

Giang, Amanda (Amanda Chi Wen)

2013-01-01T23:59:59.000Z

399

Pentanol isomer synthesis in engineered microorganisms  

E-Print Network (OSTI)

potential application as biofuels. They are found as natural3-Methyl-1-butanol . Biofuels 32 MJ/L for gasoline) and aabout microbial production of biofuels in general have been

Cann, Anthony F.; Liao, James C.

2010-01-01T23:59:59.000Z

400

AOCS Official Method H 17-58  

Science Conference Proceedings (OSTI)

Synthetic Methyl Alcohol AOCS Official Method H 17-58 Methods Downloads Methods Downloads DEFINITION   SCOPE 4FFAAA535C08DEE987D5D4241D901519 MC-H1758 2422

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

Preparations for Meeting New York and Connecticut MTBE Bans  

Reports and Publications (EIA)

In response to a Congressional request, EIA examined the progress being made to meet the bans on the use of methyl tertiary butyl ether (MTBE) being implemented in New York and Connecticut at the end of 2003.

Joanne Shore

2003-10-01T23:59:59.000Z

402

Graphene Coating-enabled Surface Plasmon Coupled Emission ...  

Science Conference Proceedings (OSTI)

... phase-matching constraints with tunable nonreciprocity factor and potentially ... ALICE in Wonderland - A Story of Carbon Nanotube Electron Emission in Space .... Methyl Orange with the Magnesium Hydroxide /Titanium Dioxide Composite ...

403

Comparing the biodiesel and biogasoil production from different natural triglycerides  

Science Conference Proceedings (OSTI)

Regarding the sustainable mobility, product quality and environmental aspects fatty acids methyl esters and biogasoils were compared. They were produced by the transesterification and special hydrocracking (including the isomerization, as well) of triglycerides, ... Keywords: biodiesel, biogasoil, feedstock supply, quality comparison

Jenö Hancsók; Zoltán Varga; Sándor Kovács; Tamás Kasza

2011-12-01T23:59:59.000Z

404

Bhopal Gas Leak: A Numerical Investigation of the Prevailing Meteorological Conditions  

Science Conference Proceedings (OSTI)

A three-dimensional mesoscale model was used to understand the meteorological conditions and the influence of the terrain on the local flow pattern during the Bhopal methyl isocyanate (MIC) gas leak. The study reveals that under the prevailing ...

Maithili Sharan; S. G. Gopalakrishnan; R. T. McNider; M. P. Singh

1996-10-01T23:59:59.000Z

405

Optimization of Fabrication Process for a PDMS-SOG-Silicon Based PCR Micro Chip through System Identification Techniques  

Science Conference Proceedings (OSTI)

A polymerase chain reaction (PCR) micro-chip with integrated thin film heaters and temperature detectors has been realized on a silicon-SOG-PDMS (polydi( methyl) siloxane) platform. Accurate temperature sensing and control is important for a PCR reaction. ...

Venumadhav Korampally; Shantanu Bhattacharya; Yuanfang Gao; Sheila A. Grant; Steven B. Kleiboeker; Keshab Gangopadhyay; Jinglu Tan; Shubhra Gangopadhyay

2006-06-01T23:59:59.000Z

406

Cationic Ir(III) alkyl and hydride complexes: stoichiometric ...  

80 S.R. Klei et al./Journal of Molecular Catalysis A: Chemical 189 (2002) 79–94 platinum(II) catalyst capable of converting methane to methyl bisulfate, which could ...

407

Engineering Project Solar-Boosted  

E-Print Network (OSTI)

Assessment of CTL · Coal & the Department of Defense · Fischer-Tropsch Fuel & EngineTesting · Coal & Biomass Methanol Methyl Acetate Acetic Anhydride Naphtha Waxes Fischer Tropsch Liquids Diesel/Jet/Gas Fuels

408

Nicotinic acetylcholine receptors contribute to learning-induced metaplasticity in the hippocampus  

Science Conference Proceedings (OSTI)

Hippocampal learning is thought to induce metaplasticity, which can facilitate subsequent learning. Administered at single low doses, the N-methyl-d-aspartate-type glutamate receptor antagonist memantine predominantly blocks ?7 nicotinic ...

Benjamin Becker; Eva M. Klein; Nadine Striepens; Yoan Mihov; Thomas E. Schlaepfer; Juergen Reul; Liesbet Goossens; Koen Schruers; Keith M. Kendrick; René Hurlemann

2013-07-01T23:59:59.000Z

409

The EMC Specimen Preparation Laboratory The Electron Microscopy...  

NLE Websites -- All DOE Office Websites (Extended Search)

RCRA waste: F003, U159, ignitable. Methyl ethyl ketone RCRA waste: F005, U159, D035 (TCLP > 200 mgl), ignitable. MICRO cleaning solution Mineral oil 5 mgm 3 (mist) 5 mgm 3...

410

Design of a micro-Functional Testing System for process characterization of a hot micro-embossing machine  

E-Print Network (OSTI)

Growth in industrial, commercial, and medical applications for micro-fluidic devices has fueled heightened research and development into micro-fluidic design, materials, and increasingly manufacturing. Polymers (Poly(methyl ...

Thaker, Kunal H. (Kunal Harish)

2006-01-01T23:59:59.000Z

411

Electrolyte additive for improved battery performance  

DOE Patents (OSTI)

In one embodiment of the present invention, there is provided an electrochemical cell having a metal bromine couple. The cell includes an electrode structure on which to deposit the metal of the couple and a counterelectrode at which to generate bromine. A microporous membrane separates the electrode and counterelectrode. Importantly, the aqueous electrolyte comprises an aqueous metal bromide solution containing a water soluble bromine complexing agent capable of forming a water immiscible complex with bromine and an additive capable of decreasing the wettability of the microporous separators employed in such cells by such water immiscible bromine complexes.

Bellows, Richard J. (Hampton, NJ); Kantner, Edward (E. Brunswick, NJ)

1989-04-04T23:59:59.000Z

412

Solar heating and cooling in the Los Alamos National Security and Resources Study Center  

DOE Green Energy (OSTI)

A description is given of the solar energy system for the National Security and Resources Study Center, a conference center and library at the Los Alamos Scientific Laboratory, Los Alamos, New Mexico. The solar heating and cooling system makes use of selectively coated collectors, hot storage, cold storage, night evaporative cold storage, heat recovery, a lithium bromide chiller, and a Rankine-cycle chiller. Data are given for the performance of the system for the years 1978 and 1979. The solar energy system has provided 76% of the energy required to heat the building and 97% of the thermal energy required to cool the building.

Hedstrom, J.C.; Murray, H.S.

1980-12-01T23:59:59.000Z

413

Solar heating and cooling system installed at Columbus, Ohio. Final report  

DOE Green Energy (OSTI)

The Solar Energy System installed at Columbus Technical Institute, Columbus, Ohio was installed as a part of a new construction of a college building. The building will house classrooms and laboratories, administrative offices and three lecture halls. The Solar Energy System consists of 4096 square feet (128 panels) Owens/Illinois Evacuated Glass Tube Collector Subsystem, and a 5000 gallon steel tank below ground storage system, hot water is circulated between the collectors and storage tank, passing through a water/lithium bromide absorption chiller to cool the building. Extracts from the site files specification references, drawings, installation, operation and maintenance instructions are included.

Coy, R.G.; Braden, R.P.

1980-09-01T23:59:59.000Z

414

A Preliminary Evaluation of Alternative Liquid Desiccants for a Hybrid Desiccant Air Conditioner  

E-Print Network (OSTI)

This paper presents the results of a preliminary investigation at The University of Texas at Austin of alternative liquid desiccants for use in a hybrid desiccant air-conditioning system in which a desiccant is circulated between the evaporator and the condenser of a vapor-compression air conditioner. The liquid desiccants studied were lithium chloride, lithium bromide, calcium chloride, and triethylene glycol. Each candidate desiccant was subjected to a screening process which weighed the merits of the desiccant in terms of selected characteristics. The best liquid desiccant for the anticipated application was found to be calcium chloride.

Studak, J. W.; Peterson, J. L.

1988-01-01T23:59:59.000Z

415

Very high efficacy electrodeless high intensity discharge lamps  

DOE Patents (OSTI)

An electrodeless arc lamp comprises an outer jacket hermetically sealing and thermally protecting an arc tube inside which has an upwardly convex bottom center section. The absence of chemically reactive electrode material makes it possible to use metal halides other than iodides. The tube contains chlorides, bromides or a mixture thereof of scandium and sodium in a nearly equimolar relationship in addition to mercury and an inert gas. Good color balance can be obtained at reduced reservoir temperature and with less power loss. Reduction in wall temperature makes it possible to attain longer lamp life.

Johnson, P.D.

1985-10-03T23:59:59.000Z

416

Surfactant loss: Effects of temperature, salinity, and wettability  

SciTech Connect

Adsorption of sodium dodecylsulfate, Triton X-100, decyltrimethylammonium bromide surfactants onto silica gel and Berea sandstone mineral surfaces has been studied as a function of temperature, solution salt concentration, and mineral surface wettability. Adsorption studies using a flow calorimeter were conducted using pure surfactants and minerals. The studies were then extended to the adsorption of one type of commercial surfactant onto both consolidated and crushed Berea sandstone using column techniques. This has allowed the comparison of different methods to evaluate surfactant losses from flowing rather than static surfactant solutions. 20 refs., 15 figs., 37 tabs.

Noll, L.A.; Gall, B.L.; Crocker, M.E.; Olsen, D.K.

1989-05-01T23:59:59.000Z

417

Experimental and analytical systems studies of a combined thermal-photovoltaic residential solar system. Technical status report No. 5, April 1-May 31, 1980  

DOE Green Energy (OSTI)

The Photovoltaic-Thermal research program schedule is diagrammed. Specifications are given for the combined concentrator Thermal-Photovoltaic Collector Array. The specifications are such as to make the array compatible with a test facility being constructed. Preliminary system checks, manual operation tests, and computer operation tests are described for evaluating the performance of a cooling load simulator. A paper entitled Transient Effects on the Performance of a Residential Solar Absorption Chiller is appended which is concerned with the transient performance of a 3-ton lithium-bromide/water absorption chiller. (LEW)

Not Available

1980-01-01T23:59:59.000Z

418

Solar cooling system performance, Frenchman's Reef Hotel, Virgin Islands. Final report  

SciTech Connect

The operational and thermal performance of a variety of solar systems are described. The Solar Cooling System was installed in a hotel at St. Thomas, U. S. Virgin Islands. The system consists of the evacuated glass tube collectors, two 2500 gallon tanks, pumps, computerized controller, a large solar optimized industrial sized lithium bromide absorption chiller, and associated plumbing. Solar heated water is pumped through the system to the designed public areas such as lobby, lounges, restaurant and hallways. Auxiliary heat is provided by steam and a heat exchanger to supplement the solar heat.

Harber, H.

1981-09-01T23:59:59.000Z

419

Rare earth gas laser  

DOE Patents (OSTI)

A high energy gas laser with light output in the infrared or visible region of the spectrum is described. Laser action is obtained by generating vapors of rare earth halides, particularly neodymium iodide or, to a lesser extent, neodymium bromide, and disposing the rare earth vapor medium in a resonant cavity at elevated temperatures; e.g., approximately 1200/sup 0/ to 1400/sup 0/K. A particularly preferred gaseous medium is one involving a complex of aluminum chloride and neodymium chloride, which exhibits tremendously enhanced vapor pressure compared to the rare earth halides per se, and provides comparable increases in stored energy densities.

Krupke, W.F.

1975-10-31T23:59:59.000Z

420

Physicochemical properties and toxicities of hydrophobic piperidinium and  

NLE Websites -- All DOE Office Websites (Extended Search)

Physicochemical properties and toxicities of hydrophobic piperidinium and Physicochemical properties and toxicities of hydrophobic piperidinium and pyrrolidinium ionic liquids Title Physicochemical properties and toxicities of hydrophobic piperidinium and pyrrolidinium ionic liquids Publication Type Journal Article Year of Publication 2007 Authors Salminen, Justin, Nicolas Papaiconomou, Anand R. Kumar, Jong-Min Lee, John B. Kerr, John S. Newman, and John M. Prausnitz Journal Fluid Phase Equilibria Volume 261 Pagination 421-426 Keywords hydrophobic, ionic liquids, piperidinium, properties, pyrrolidinium, safety, toxicity Abstract Some properties are reported for hydrophobic ionic liquids (IL) containing 1-methyl-1-propyl pyrrolidinium [MPPyrro]+, 1-methyl-1-butyl pyrrolidinium [MBPyrro]+, 1-methyl-1-propyl piperidinium [MPPip]+, 1-methyl-1-butyl piperidinium [MBPip]+, 1-methyl-1-octyl pyrrolidinium [MOPyrro]+ and 1-methyl-1-octyl piperidinium [MOPip]+ cations. These liquids provide new alternatives to pyridinium and imidazolium ILs. High thermal stability of an ionic liquid increases safety in applications like rechargeable lithium-ion batteries and other electrochemical devices. Thermal properties, ionic conductivities, viscosities, and mutual solubilities with water are reported. In addition, toxicities of selected ionic liquids have been measured using a human cancer cell line. The ILs studied here are sparingly soluble in water but hygroscopic. We show some structure-property relationships that may help to design green solvents for specific applications. While ionic liquids are claimed to be environmentally benign solvents, as yet few data have been published to support these claims.

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

Detailed chemical kinetic oxidation mechanism for a biodiesel surrogate  

DOE Green Energy (OSTI)

A detailed chemical kinetic mechanism has been developed and used to study the oxidation of methyl decanoate, a surrogate for biodiesel fuels. This model has been built by following the rules established by Curran et al. for the oxidation of n-heptane and it includes all the reactions known to be pertinent to both low and high temperatures. Computed results have been compared with methyl decanoate experiments in an engine and oxidation of rapeseed oil methyl esters in a jet stirred reactor. An important feature of this mechanism is its ability to reproduce the early formation of carbon dioxide that is unique to biofuels and due to the presence of the ester group in the reactant. The model also predicts ignition delay times and OH profiles very close to observed values in shock tube experiments fueled by n-decane. These model capabilities indicate that large n-alkanes can be good surrogates for large methyl esters and biodiesel fuels to predict overall reactivity, but some kinetic details, including early CO2 production from biodiesel fuels, can be predicted only by a detailed kinetic mechanism for a true methyl ester fuel. The present methyl decanoate mechanism provides a realistic kinetic tool for simulation of biodiesel fuels.

Herbinet, O; Pitz, W J; Westbrook, C K

2007-09-17T23:59:59.000Z

422

Detailed chemical kinetic oxidation mechanism for a biodiesel surrogate  

DOE Green Energy (OSTI)

A detailed chemical kinetic mechanism has been developed and used to study the oxidation of methyl decanoate, a surrogate for biodiesel fuels. This model has been built by following the rules established by Curran et al. for the oxidation of n-heptane and it includes all the reactions known to be pertinent to both low and high temperatures. Computed results have been compared with methyl decanoate experiments in an engine and oxidation of rapeseed oil methyl esters in a jet stirred reactor. An important feature of this mechanism is its ability to reproduce the early formation of carbon dioxide that is unique to biofuels and due to the presence of the ester group in the reactant. The model also predicts ignition delay times and OH profiles very close to observed values in shock tube experiments fueled by n-decane. These model capabilities indicate that large n-alkanes can be good surrogates for large methyl esters and biodiesel fuels to predict overall reactivity, but some kinetic details, including early CO{sub 2} production from biodiesel fuels, can be predicted only by a detailed kinetic mechanism for a true methyl ester fuel. The present methyl decanoate mechanism provides a realistic kinetic tool for simulation of biodiesel fuels.

Herbinet, O; Pitz, W J; Westbrook, C K

2007-09-20T23:59:59.000Z

423

Design and testing a solar cooling system employing liquid desiccants: Dehumidifier experiments in Colorado State University Solar House II: Final report, 1986--1987  

DOE Green Energy (OSTI)

A nominal 3-ton (10.5-kW) lithium bromide, open-cycle desiccant cooling system has been designed, installed, and operated. This experimental system dehumidifies ambient air in a packed bed utilizing an aqueous solution of lithium bromide. The absorbent solution is distributed by spray nozzles and flows countercurrent to the air. The dilute solution exiting the dehumidifier is concentrated in a packed bed regenerator by solar heated air. The strong solution is cooled by two heat exchangers before reentering the dehumidifier. Provisions to simulate conditions of high ambient humidity and temperature have been made. Experiments on the dehumidifier operating in a decoupled mode (without countercurrent regenerator operation) have been carried out. Cooling capacities in the range of 1.0--4.0 refrigeration tons have been achieved, depending upon the operating conditions. The effect of different independent variables on the capacity of the dehumidifier has been studied. An empirical equation correlating the variables have been obtained by statistical analysis of the data. The equation obtained indicates that the capacity of the dehumidifier depends strongly on the solution concentration, solution flow rate, air inlet temperature and the air humidity. Two other variables studied, the solution inlet temperature and the air flow rate, did not affect the cooling capacity greatly. The dependence of condensation rate on each of the variables is analyzed. 22 refs., 17 figs., 3 tabs.

Lenz, T.G.; Loef, G.O.G.; Patnaik, S.

1987-12-01T23:59:59.000Z

424

Testing and design of solar cooling systems employing liquid dessicants  

DOE Green Energy (OSTI)

An open cycle liquid desiccant cooling system with cooling capacity of 3 tons (10.5 kW) a subject of research at Colorado State University. The system comprises two main units: the dehumidifier and the regenerator. Lithium bromide is the desiccant solution that dehumidifies the air stream during a counter-current, liquid-gas contacting in the packed tower. The regenerator concentrates the lithium bromide solution during a similar gas-liquid contacting using solar heated air with the only difference being that the direction of heat and mass transfer are reversed in this unit. The earlier studies conducted on the dehumidifier revealed significant departures from an energy balance closure. An attempt has been made to provide a realistic energy balance closure to the dehumidifier side. This has resulted in substantial re-calibration of the major instruments involved. Performance data of the entire system with the regenerator and dehumidifier operated in coupled mode have been presented. An optimization scheme to predict operating conditions suited for best performance of the two units, for varying ambient temperature and humidity to the dehumidifier, has been devised. 15 refs., 20 figs., 8 tabs.

Lenz, T.; Loef, G.O.G.; Flaherty, M.; Misra, S.; Patnaik, S.

1989-05-01T23:59:59.000Z

425

Solvothermal synthesis and luminescence properties of monodisperse Gd{sub 2}O{sub 3}:Eu{sup 3+} and Gd{sub 2}O{sub 3}:Eu{sup 3+}SiO{sub 2} nanospheres  

Science Conference Proceedings (OSTI)

A series of uniform, monodispersed Gd(OH){sup 3}:Eu{sup 3+} nanospheres less than 100 nm were successfully synthesized with iron ions as catalyst and DMF as solvent under the solvothermal condition. Cetyltrimethyl ammonium bromide (CTAB) and Polyvinylpyrrolidone (PVP) were performed as co-surfactant during this facile procedure should be changed as A series of uniform, monodisperse Gd(OH){sup 3}:Eu{sup 3+} nanospheres less than 100 nm in diameter were successfully synthesized with solvothermal method. Iron ion was used as catalyst and Dimethylformamide (DMF) as solvent, Cetyltrimethyl Ammonium Bromide (CTAB) and Polyvinylpyrrolidone (PVP) were performed as surfactants. Further calcination process was applied to prepare Gd{sub 2}O{sub 3}:Eu{sup 3+} nanoshpheres during this facile procedure. -- Graphical abstract: Uniform and monodisperse Gd{sub 2}O{sub 3}:Eu{sup 3+} and Gd{sub 2}O{sub 3}:Eu{sup 3+}SiO{sub 2} monodisperse were synthesized by annealed relative parent's Gd(OH){sub 3}:Eu{sup 3+} and Gd(OH){sub 3}:Eu{sup 3+}SiO{sub 2}, respectively. Their morphology and luminescence properties all strongly depended on the iron concentration. Display Omitted

Wang, Yu; Bai, Xue; Liu, Tong; Dong, Biao; Xu, Lin; Liu, Qiong [State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012 (China); Song, Hongwei, E-mail: hwsong2005@yahoo.com.c [State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012 (China)

2010-12-15T23:59:59.000Z

426

Investigation into Nanostructured Lanthanum Halides and CeBr3 for Nuclear Radiation Detection  

SciTech Connect

Nanocomposites may enable the use of scintillator materials such as cerium-doped lanthanum fluoride (LaF3:Ce) and cerium bromide (CeBr3) without requiring the growth of large crystals [1]. Nanostructured detectors may allow us to engineer immensely sized detectors of flexible form factors that will have a broad energy range and an energy resolution sufficient to perform isotopic identification. Furthermore, nanocomposites are easy to prepare and very low in cost. It is much less costly to use nanocomposites rather than grow large whole crystals of scintillator materials; with nanocomposites fabricated on an industrial scale, costs are even less. Nanostructured radiation scintillator detectors may improve quantum efficiency and provide vastly improved detector form factors. Quantum efficiencies up to 60% have been seen in photoluminescence from silicon nanocrystals in a densely-packed ensemble [2]. We have fabricated nanoparticles with sizes <10 nm and characterized their nanocomposite radiation detector properties. This work investigates the properties of the nanostructured radiation scintillator in order to extend the gamma energy response on both low- and high-energy regimes by demonstrating the ability to detect low-energy x-rays and relatively high-energy activation prompt gamma rays simultaneously using nanostructured lanthanum bromide, lanthanum fluoride, or CeBr3. Preliminary results of this investigation are consistent with a significant response of these materials to nuclear radiation.

Guss, P. P., Guise, R., Mukhopadhyay, S., Yuan, D.

2011-07-06T23:59:59.000Z

427

Field evidence for strong chemical separation of contaminants inthe Hanford Vadose Zone  

SciTech Connect

Water and chemical transport from a point source withinvadose zone sediments at Hanford were examined with a leak testconsisting of five 3800-liter aliquots of water released at 4.5 m depthevery week over a 4-week period. The third aliquot contained bromide, D2Oand 87Sr. Movement of the tracers was monitored for 9 months by measuringpore water compositions of samples from boreholes drilled 2-8 m from theinjection point. Graded sedimentary layers acting as natural capillarybarriers caused significant lateral spreading of the leak water. D2Oconcentrations>50 percent of the concentration in the tracer aliquotwere detected at 9-11 m depth. However, increased water contents, lowerd18O values, and geophysical monitoring of moisture changes at otherdepths signified high concentrations of leak fluids were added where D2Oconcentrations were<3 percent above background, suggesting limitedmixing between different aliquots of the leak fluids. Initially highbromide concentrations decreased more rapidly over time than D2O,suggesting enhanced transport of bromide due to anion exclusion. Nosignificant increase in 87Sr was detected in the sampled pore water,indicating strong retardation of Sr by the sediments. These resultshighlight some of the processes strongly affecting chemical transport inthe vadose zone and demonstrate the significant separation of contaminantplumes that can occur.

Conrad, Mark E.; DePaolo, Donald J.; Maher, Katharine; Gee,Glendon W.; Ward, Anderson L.

2007-04-10T23:59:59.000Z

428

Controlling mercury emissions from coal-fired power plants  

Science Conference Proceedings (OSTI)

Increasingly stringent US federal and state limits on mercury emissions form coal-fired power plants demand optimal mercury control technologies. This article summarises the successful removal of mercury emissions achieved with activated carbon injection and boiler bromide addition, technologies nearing commercial readiness, as well as several novel control concepts currently under development. It also discusses some of the issues standing in the way of confident performance and cost predictions. In testing conducted on western coal-fired units with fabric filters or TOXECON to date, ACI has generally achieved mercury removal rates > 90%. At units with ESPs, similar performance requires brominated ACI. Alternatively, units firing western coals can use boiler bromide addition to increase flue gas mercury oxidation and downstream capture in a wet scrubber, or to enhance mercury removal by ACI. At eastern bituminous fired units with ESPs, ACI is not as effective, largely due to SO{sub 3} resulting from the high sulfur content of the coal or the use of SO{sub 3} flue gas conditioning to improve ESP performance. 7 refs., 3 figs.

Chang, R. [Electric Power Research Institute, Palo Alto, CA (United States)

2009-07-15T23:59:59.000Z

429

Radiation-Induced Epigenetic Alterations after Low and High LET Irradiations  

SciTech Connect

Epigenetics, including DNA methylation and microRNA (miRNA) expression, could be the missing link in understanding the delayed, non-targeted effects of radiation including radiationinduced genomic instability (RIGI). This study tests the hypothesis that irradiation induces epigenetic aberrations, which could eventually lead to RIGI, and that the epigenetic aberrations induced by low linear energy transfer (LET) irradiation are different than those induced by high LET irradiations. GM10115 cells were irradiated with low LET x-rays and high LET iron (Fe) ions and evaluated for DNA damage, cell survival and chromosomal instability. The cells were also evaluated for specific locus methylation of nuclear factor-kappa B (NF?B), tumor suppressor in lung cancer 1 (TSLC1) and cadherin 1 (CDH1) gene promoter regions, long interspersed nuclear element 1 (LINE-1) and Alu repeat element methylation, CpG and non-CpG global methylation and miRNA expression levels. Irradiated cells showed increased micronucleus induction and cell killing immediately following exposure, but were chromosomally stable at delayed times post-irradiation. At this same delayed time, alterations in repeat element and global DNA methylation and miRNA expression were observed. Analyses of DNA methylation predominantly showed hypomethylation, however hypermethylation was also observed. MiRNA shown to be altered in expression level after x-ray irradiation are involved in chromatin remodeling and DNA methylation. Different and higher incidence of epigenetic changes were observed after exposure to low LET x-rays than high LET Fe ions even though Fe ions elicited more chromosomal damage and cell killing. This study also shows that the irradiated cells acquire epigenetic changes even though they are chromosomally stable suggesting that epigenetic aberrations may arise in the cell without initiating RIGI.

Aypar, Umut; Morgan, William F.; Baulch, Janet E.

2011-02-01T23:59:59.000Z

430

Dimerization of a Viral SET Protein Endows its Function  

SciTech Connect

Histone modifications are regarded as the most indispensible phenomena in epigenetics. Of these modifications, lysine methylation is of the greatest complexity and importance as site- and state-specific lysine methylation exerts a plethora of effects on chromatin structure and gene transcription. Notably, paramecium bursaria chlorella viruses encode a conserved SET domain methyltransferase, termed vSET, that functions to suppress host transcription by methylating histone H3 at lysine 27 (H3K27), a mark for eukaryotic gene silencing. Unlike mammalian lysine methyltransferases (KMTs), vSET functions only as a dimer, but the underlying mechanism has remained elusive. In this study, we demonstrate that dimeric vSET operates with negative cooperativity between the two active sites and engages in H3K27 methylation one site at a time. New atomic structures of vSET in the free form and a ternary complex with S-adenosyl homocysteine and a histone H3 peptide and biochemical analyses reveal the molecular origin for the negative cooperativity and explain the substrate specificity of H3K27 methyltransferases. Our study suggests a 'walking' mechanism, by which vSET acts all by itself to globally methylate host H3K27, which is accomplished by the mammalian EZH2 KMT only in the context of the Polycomb repressive complex.

H Wei; M Zhou

2011-12-31T23:59:59.000Z

431

The Risk Assessment Information System  

NLE Websites -- All DOE Office Websites (Extended Search)

Condensed Toxicity Summary for METHYL ISOBUTYL KETONE Condensed Toxicity Summary for METHYL ISOBUTYL KETONE 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 Rosmarie A. Faust, Ph.D., Chemical Hazard Evaluation and Communication Program, 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. Methyl isobutyl ketone (MIBK) (CAS Reg. No. 108-10-1), a clear liquid with

432

Radiotracers currently produced at Brookhaven  

NLE Websites -- All DOE Office Websites (Extended Search)

Radiotracers currently produced at Brookhaven. Note that other radiotracers that are described in the literature can Radiotracers currently produced at Brookhaven. Note that other radiotracers that are described in the literature can also be transferred to our laboratory. Molecular Target/use Radiotracer Name Structure Chemical Name Hexokinase/glucose metabolism, cancer, brain function 18 FDG 2-deoxy-2-[ 18 F]fluoro-D-glucose Dopamine D2/D3 receptors/addiction, psychiatric disorders [ 11 C]raclopride 3,5-dichloro-N-{[(2S)-1-ethylpyrrolidin- 2-yl]methyl}-2-hydroxy-6- [ 11 C]methoxybenzamide Dopamine transporters / cocaine pharmacokinetics, addiction, neurological disorders [ 11 C]cocaine methyl (1R,2R,3S,5S)-3-s(benzoyloxy)- 8-[ 11 C]methyl-8-azabicyclo[3.2.1] octane-2-carboxylate Blood flow/nicotine pharmacokinetics [ 11 C]nicotine 3-[(2S)-1-[ 11 C]methylpyrrolidin-2-

433

Modeling the Auto-Ignition of Biodiesel Blends with a Multi-Step Model  

SciTech Connect

There is growing interest in using biodiesel in place of or in blends with petrodiesel in diesel engines; however, biodiesel oxidation chemistry is complicated to directly model and existing surrogate kinetic models are very large, making them computationally expensive. The present study describes a method for predicting the ignition behavior of blends of n-heptane and methyl butanoate, fuels whose blends have been used in the past as a surrogate for biodiesel. The autoignition is predicted using a multistep (8-step) model in order to reduce computational time and make this a viable tool for implementation into engine simulation codes. A detailed reaction mechanism for n-heptane-methyl butanoate blends was used as a basis for validating the multistep model results. The ignition delay trends predicted by the multistep model for the n-heptane-methyl butanoate blends matched well with that of the detailed CHEMKIN model for the majority of conditions tested.

Toulson, Dr. Elisa [Michigan State University, East Lansing; Allen, Casey M [Michigan State University, East Lansing; Miller, Dennis J [Michigan State University, East Lansing; McFarlane, Joanna [ORNL; Schock, Harold [Michigan State University, East Lansing; Lee, Tonghun [Michigan State University, East Lansing

2011-01-01T23:59:59.000Z

434

Recent Advances in Detailed Chemical Kinetic Models for Large Hydrocarbon and Biodiesel Transportation Fuels  

DOE Green Energy (OSTI)

n-Hexadecane and 2,2,4,4,6,8,8-heptamethylnonane represent the primary reference fuels for diesel that are used to determine cetane number, a measure of the ignition property of diesel fuel. With the development of chemical kinetics models for these two primary reference fuels for diesel, a new capability is now available to model diesel fuel ignition. Also, we have developed chemical kinetic models for a whole series of large n-alkanes and a large iso-alkane to represent these chemical classes in fuel surrogates for conventional and future fuels. Methyl decanoate and methyl stearate are large methyl esters that are closely related to biodiesel fuels, and kinetic models for these molecules have also been developed. These chemical kinetic models are used to predict the effect of the fuel molecule size and structure on ignition characteristics under conditions found in internal combustion engines.

Westbrook, C K; Pitz, W J; Curran, H J; Herbinet, O; Mehl, M

2009-03-30T23:59:59.000Z

435

Mechanistic enzymology of CO dehydrogenase from Clostridium thermoaceticum  

DOE Green Energy (OSTI)

The final steps in acetyl-CoA biosynthesis by anaerobic bacteria are performed by carbon monoxide dehydrogenase (CODH), a nickel/iron-sulfur protein. An important achievement was to establish conditions under which acetyl-CoA synthesis by purified enzymes equals the in vivo rate of acetate synthesis. Under these optimized conditions we established that the rate limiting step in the synthesis of acetyl-CoA from methyl-H[sub 4]folate, CO and CoA is likely to be the methylation of CODH by the methylated corrinoid/iron-sulfur protein. We then focused on stopped flow studies of this rate limiting transmethylation reaction and established its mechanism. We have studied the carbonylation of CODH by infrared and resonance Raman spectroscopy and determined that the [Ni-Fe[sup 3-4]S[sub 4

Ragsdale, S.W.

1992-01-01T23:59:59.000Z

436

DOE/EIS-0285; Bonneville Power Administration Transmission System Vegetation Management Program Final Environmental Impact Statement (May 2000)  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Statement - Appendices Statement - Appendices DOE/EIS-0285 Arrow-leaf Balsamroot Cooperating Agencies Bonneville Power Administration Transmission System Vegetation Management Program Final Environmental Impact Statement DOE/EIS-0285 APPENDICES May 2000 Table of Contents Appendix A - Public Involvement: Publications Appendix B - Biological Weed Control Agents Appendix C - Bonneville Pesticide Applicator Certification Plan Appendix D - Sample Educational Information Appendix E - Clearance Criteria Appendix F - FS Mitigation Measures and Background Appendix G - BLM Mitigation Measures and Background Appendix H - Herbicide Fact Sheets 2,4-D Azafenidin Bromacil Chlorsulfuron Clopyralid Dicamba Dichlobenil Diuron Fosamine Ammonium Glyphosate Halosulfuron-methyl Hexazinone Imazapyr Isoxaben Mefluidide Metsulfuron-methyl

437

A review of chromatographic characterization techniques for biodiesel and biodiesel blends.  

Science Conference Proceedings (OSTI)

This review surveys chromatographic technology that has been applied to the characterization of biodiesel and its blends. Typically, biodiesel consists of fatty acid methyl esters produced by transesterification of plant or animal derived triacylglycerols. Primary attention is given to the determination of trace impurities in biodiesel, such as methanol, glycerol, mono-, di-, and triacylglycerols, and sterol glucosides. The determination of the fatty acid methyl esters, trace impurities in biodiesel, and the determination of the biodiesel content of commercial blends of biodiesel in conventional diesel are also addressed.

Pauls, R. E. (Chemical Sciences and Engineering Division)

2011-05-01T23:59:59.000Z

438

Phosphorylation of HOX11/TLX1 on Threonine-247 during mitosis modulates expression of cyclin B1  

E-Print Network (OSTI)

have side chains with amine groups this change likely does not affect DNA interac- tions [20]. In contrast, Thr has both methyl and hydro- xyl groups in its side chain while Ile contains only a hydrophobic methyl group and this amino acid change... CDP/Cux [39], hSIX1 [40], the POU transcrip- tion factors Oct-1, GHF-1 and Pit-1[41-43], the NK-like homeodomain proteins, Csx/Nkx2.5 [44], and PRH/Hex [45] and the clustered homeobox genes HOXA9 [46], HOXA10 [47-50], HOXB6 [51] and HOXB7 [52]. In some...

Chen, Edwin; Huang, Xiaoyong; Zheng, Yanzhen; Li, You-Jun; Chesney, Alden; Ben-David, Yaacov; Yang, Eric; Hough, Margaret R

2010-09-16T23:59:59.000Z

439

CFN Bldg 735 Safety Awareness  

NLE Websites -- All DOE Office Websites (Extended Search)

Bldg 735 Safety Awareness Bldg 735 Safety Awareness Fire Alarms: There are 2 different fire alarms in the CFN. The first being the normal ringing in the event of a fire. The second one is a temporal 3 (distinct ring) followed by a message to exit out the north(front) doors only. After evacuation go to the outdoor assembly area west side of the evacuation go to the outdoor assembly area west side of the building. SPECIFIC BUILDING HAZARDS: Lab 1L17 - Pyrophoric gases, flammable gases Clean Room Galley - Chlorine, Hydrogen Bromide, Pyrophoric gases, flammable gases CFN Bldg 735 Safety Awareness If you discover a fire, you should activate the Building Fire/Evacuation Alarm System. From a safe location, call the BNL emergency notification line at x2222 or dial 911. (Cell 631-344-2222)

440

800,000 Jobs by 2012 | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

800,000 Jobs by 2012 800,000 Jobs by 2012 800,000 Jobs by 2012 August 16, 2010 - 6:21pm Addthis Andy Oare Andy Oare Former New Media Strategist, Office of Public Affairs What does this mean for me? ZBB Energy is a clean energy manufacturing company specializing in the production of advanced zinc bromide flow batteries and intelligent power control platforms for renewable energy storage. It's also a prime example of how the Recovery Act is helping new clean energy industries bolster the manufacturing economies of mid-western states. Today, President Barack Obama visited ZBB Energy Corporation in Menomonee Falls, Wisconsin, and declared that our commitment to clean energy is expected to lead to more than 800,000 jobs by 2012. ZBB Energy Corporation is a clean energy manufacturing company specializing

Note: This page contains sample records for the topic "74-83-9 methyl bromide" from the National Library of EnergyBeta (NLEBeta).
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to obtain the most current and comprehensive results.


441

PowerPoint Presentation  

NLE Websites -- All DOE Office Websites (Extended Search)

Aqueous Rechargeable Lithium Batteries (ARLBs) Aqueous Rechargeable Lithium Batteries (ARLBs) of High Energy Density Prof. Dr. Yuping Wu New Energy and Materials Laboratory (NEML), Department of Chemistry, Fudan University, Shanghai 200433 Tel/Fax: +86-21-5566 4223 Email: wuyp@fudan.edu.cn @ 6th US-China Electric Vehicles and Battery Technology Workshop, Boston 23-24 August, 2012 Motto of NEML Electrochemical technologies 4E + E Energy problem Environmental pollution Enjoy life Solve Reduce To cultivate Elites for the society. 1. Chemical Power Sources * Supercapacitors * Polysulfide bromide battery (PSB) * Zn/Br battery * Vanadium redox couples (VRC) * Sodium sulfur battery (Na/S) * Lead acid battery * Metal-air battery * Ni-MH * Lithium ion battery * Safety * Rate capability

442

Gas-Fired Absorption Heat Pump Water Heater Research Project | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Emerging Technologies » Gas-Fired Absorption Heat Pump Water Emerging Technologies » Gas-Fired Absorption Heat Pump Water Heater Research Project Gas-Fired Absorption Heat Pump Water Heater Research Project The U.S. Department of Energy (DOE) is currently conducting research into carbon gas-fired absorption heat pump water heaters. This project will employ innovative techniques to increase water heating energy efficiency over conventional gas storage water heaters by 40%. Project Description This project seeks to develop a natural gas-fired water heater using an absorption heat. The development effort is targeting lithium bromide aqueous solutions as a working fluid in order to avoid the negative implications of using more toxic ammonia. Project Partners Research is being undertaken through a Cooperative Research and Development

443

Analysis of anions in geological brines using ion chromatography  

DOE Green Energy (OSTI)

Ion chromatographic procedures for the determination of the anions bromide, sulfate, nitrite, nitrate, phosphate, and iodide in brine samples have been developed and are described. The techniques have been applied to the analysis of natural brines, and geologic evaporites. Sample matrices varied over a range from 15,000 mg/L to 200,000 mg/L total halogens, nearly all of which is chloride. The analyzed anion concentrations ranged from less than 5 mg/L in the cases of nitrite, nitrate, and phosphate, to 20,000 mg/L in the case of sulfate. A technique for suppressing chloride and sulfate ions to facilitate the analysis of lower concentration anions is presented. Analysis times are typically less than 20 minutes for each procedure and the ion chromatographic results compare well with those obtained using more time consuming classical chemical analyses. 10 references, 14 figures.

Merrill, R.M.

1985-03-01T23:59:59.000Z

444

Test report : Princeton power systems prototype energy storage system.  

SciTech Connect

The Department of Energy Office of Electricity (DOE/OE), Sandia National Laboratory (SNL) and the Base Camp Integration Lab (BCIL) partnered together to incorporate an energy storage system into a microgrid configured Forward Operating Base to reduce the fossil fuel consumption and to ultimately save lives. Energy storage vendors will be sending their systems to SNL Energy Storage Test Pad (ESTP) for functional testing and then to the BCIL for performance evaluation. The technologies that will be tested are electro-chemical energy storage systems comprised of lead acid, lithium-ion or zinc-bromide. Princeton Power Systems has developed an energy storage system that utilizes lithium ion phosphate batteries to save fuel on a military microgrid. This report contains the testing results and some limited analysis of performance of the Princeton Power Systems Prototype Energy Storage System.

Rose, David Martin; Schenkman, Benjamin L.; Borneo, Daniel R.

2013-08-01T23:59:59.000Z

445

Comparison of advanced battery technologies for electric vehicles  

DOE Green Energy (OSTI)

Battery technologies of different chemistries, manufacture and geometry were evaluated as candidates for use in Electric Vehicles (EV). The candidate batteries that were evaluated include four single cell and seven multi-cell modules representing four technologies: Lead-Acid, Nickel-Cadmium, Nickel-Metal Hydride and Zinc-Bromide. A standard set of testing procedures for electric vehicle batteries, based on industry accepted testing procedures, and any tests which were specific to individual battery types were used in the evaluations. The batteries were evaluated by conducting performance tests, and by subjecting them to cyclical loading, using a computer controlled charge--discharge cycler, to simulate typical EV driving cycles. Criteria for comparison of batteries were: performance, projected vehicle range, cost, and applicability to various types of EVs. The four battery technologies have individual strengths and weaknesses and each is suited to fill a particular application. None of the batteries tested can fill every EV application.

Dickinson, B.E.; Lalk, T.R. [Texas A and M Univ., College Station, TX (United States). Mechanical Engineering Dept.; Swan, D.H. [Univ. of California, Davis, CA (United States). Inst. of Transportation Studies

1993-12-31T23:59:59.000Z

446

Assessment of Energy Storage Alternatives in the Puget Sound Energy System  

DOE Green Energy (OSTI)

As part of an ongoing study co-funded by the Bonneville Power Administration, under its Technology Innovation Grant Program, and the U.S. Department of Energy, the Pacific Northwest National Laboratory (PNNL) has developed an approach and modeling tool for assessing the net benefits of using energy storage located close to the customer in the distribution grid to manage demand. PNNL in collaboration with PSE and Primus Power has evaluated the net benefits of placing a zinc bromide battery system at two locations in the PSE system (Baker River / Rockport and Bainbridge Island). Energy storage can provide a number of benefits to the utility through the increased flexibility it provides to the grid system. Applications evaluated in the assessment include capacity value, balancing services, arbitrage, distribution deferral and outage mitigation. This report outlines the methodology developed for this study and Phase I results.

Balducci, Patrick J.; Jin, Chunlian; Wu, Di; Kintner-Meyer, Michael CW; Leslie, Patrick; Daitch, Charles

2013-12-12T23:59:59.000Z

447

Velocity map imaging of HBr photodissociation in large rare gas clusters  

SciTech Connect

We have implemented the velocity map imaging technique to study clustering in the pulsed supersonic expansions of hydrogen bromide in helium, argon, and xenon. The expansions are characterized by direct imaging of the beam velocity distributions. We have investigated the cluster generation by means of UV photodissociation and photoionization of HBr molecules. Two distinct features appear in the hydrogen atom photofragment images in the clustering regime: (i) photofragments with near zero kinetic energies and (ii) ''hot'' photofragments originating from vibrationally excited HBr molecules. The origin of both features is attributed to the fragment caging by the cluster. We discuss the nature of the formed clusters based on the change of the photofragment images with the expansion parameters and on the photoionization mass spectra and conclude that single HBr molecule encompassed with rare gas ''snowball'' is consistent with the experimental observations.

Fedor, J.; Kocisek, J.; Poterya, V.; Votava, O.; Pysanenko, A.; Farnik, M. [J. Heyrovsky Institute of Physical Chemistry v.v.i., Academy of Sciences of the Czech Republic, Dolejskova 3, 18223 Prague (Czech Republic); Lipciuc, M. L. [Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA (United Kingdom); Kitsopoulos, T. N. [Department of Chemistry, University of Crete, Heraklion (Greece) and Institute of Electronic Structure and Lasers, Foundation for Research and Technology, Hellas, P.O. Box 1527, 71110 Heraklion (Greece)

2011-04-21T23:59:59.000Z

448

Evaluation of high performance evacuated tubular collectors in a residential heating and cooling system: Colorado State University Solar House I. Report for October 1, 1976--September 30, 1977  

DOE Green Energy (OSTI)

CSU Solar House I is configured with a prototype Corning evacuated tubular collector and a new Arkla lithium bromide water chiller designed for solar operation. Data have been collected for this configuration since January 1977. Prior to that time and since mid-1974, Solar House I has operated with a flat-plate collector and a previous Arkla LiBr air conditioner modified to operate in the lower solar temperature ranges. Project objectives were to develop an operating and control system for the new configuration and to compare the performance of the new residential solar heating, cooling, and hot water system with performance of the previous system. Many problems were encountered in the evolution of the operating and control systems due to the different operating characteristics of evacuated tubular collectors, such as their rapid thermal response and the possibility of much higher temperatures as compared to a flat-plate collector.

Duff, W.S.; Conway, T.M.; Loef, G.O.G.; Meredith, D.B.; Pratt, R.B.

1978-03-01T23:59:59.000Z

449

Symbol Designation Unit Variables – Latin letters  

E-Print Network (OSTI)

A dynamic model for the simulation of a new single-effect water/lithium bromide absorption chiller is developed. The chiller is driven by two distinct heat sources, includes a custom integrated falling film evaporator-absorber, uses mixed recirculation and is exclusively cooled by the ambient air. Heat and mass transfer in the evaporator-absorber and in the desorber are described according to a physical model for vapour absorption based on Nusselt’s film theory. The other heat exchangers are handled using a simplified approach based on the NTUeffectiveness method. The model is then used to analyze the chiller response to a step drop of the heat recovery circuit flow rate, and to a sudden reduction of the cooling need in the conditioned space. In the latter case, a basic temperature regulation system is simulated. In both simulations, the performance of the chiller is well represented and consistent with expectations.

Matthieu Zinet; Romuald Rulliere

2013-01-01T23:59:59.000Z

450

Optimum hot water temperature for absorption solar cooling  

SciTech Connect

The hot water temperature that maximizes the overall instantaneous efficiency of a solar cooling facility is determined. A modified characteristic equation model is used and applied to single-effect lithium bromide-water absorption chillers. This model is based on the characteristic temperature difference and serves to empirically calculate the performance of real chillers. This paper provides an explicit equation for the optimum temperature of vapor generation, in terms of only the external temperatures of the chiller. The additional data required are the four performance parameters of the chiller and essentially a modified stagnation temperature from the detailed model of the thermal collector operation. This paper presents and discusses the results for small capacity machines for air conditioning of homes and small buildings. The discussion highlights the influence of the relevant parameters. (author)

Lecuona, A.; Ventas, R.; Venegas, M.; Salgado, R. [Dpto. Ingenieria Termica y de Fluidos, Universidad Carlos III de Madrid, Avda. Universidad 30, 28911 Leganes, Madrid (Spain); Zacarias, A. [ESIME UPA, IPN, Av. de las Granjas 682, Col. Santa Catarina, 02550, D.F. Mexico (Mexico)

2009-10-15T23:59:59.000Z

451

Initial operation and performance of a Rankine chiller and an absorption chiller in the National Security and Resources Study Center  

DOE Green Energy (OSTI)

A 60,000 ft/sup 2/ building heated and cooled with an 8,000 ft/sup 2/ array of flat plate collectors is described. The single-glazed collectors have a selective surface of black chrome. A paraffinic oil is used as the collector heat transfer fluid. In the cooling mode hot water is stored in a 5,000 gallon pressurized tank and chilled water is stored in a 10,000 gallon tank. Two water chillers are used; a conventional York lithium-bromide absorption unit derated to 85 tons with 185/sup 0/F hot water, and the other a Rankine unit designed and fabricated by Barber-Nichols. The operation of the two chillers is compared. (MHR)

Hedstrom, J.C.; Murray, H.S.; Balcomb, J.D.

1978-01-01T23:59:59.000Z

452

Energy Saving with Absorption Refrigeration Technologies  

E-Print Network (OSTI)

Absorption refrigeration technology can be an economical and cost effective means of reducing energy cost and/or improving the efficiency and output of your process. We believe the potential benefits of absorption refrigeration technology have generally been overlooked by the process industry. This paper will address the application of the lithium bromide-water cycle in various energy saving modes. A waste heat powered absorption chiller producing chilled water can reduce energy consumption in a process plant by replacing an existing mechanical refrigeration system or replacing cooling tower water with a lower temperature cooling medium at negligible increase in energy cost. A variety of waste heat sources can be used at temperatures as low as 150 F.

Davis, R. C.

1984-01-01T23:59:59.000Z

453

Proprties of the Carrol system and a machine design for solar-powered, air-cooled, absorption space cooling. Phase I and Phase II. Final report, September 1977-March 1979  

DOE Green Energy (OSTI)

The name Carrol has been selected as a convenient short-hand designation for a prime candidate chemical system comprising ethylene glycol-lithium bromide as an absorbent mixture with water as a refrigerant. The instrumentation, methods of handling data and numerical results from a systematic determination of Carrol property data required to design an air cooled absorption machine based on this chemical system are described. These data include saturation temperature, relative enthalpy, density, specific heat capacity, thermal conductivity, viscosity and absorber film heat transfer coefficient as functions of solution temperature and Carrol concentration over applicable ranges. For each of the major components of the absorption chiller, i.e., generator, chiller, absorber, condenser, heat exchanger, purge and controls, the report contains an assembly drawing and the principal operating characteristics of that component.

Biermann, W.J.

1981-05-01T23:59:59.000Z

454

Solar-cooling-system performance, Frenchman's Reef Hotel, St. Thomas, US Virgin Islands. Final report  

DOE Green Energy (OSTI)

The Solar Cooling System installed in the Frenchman's Reef Resort Hotel Test Site, St. Thomas, US Virgin Islands, used 956 Sunmaster Corporation evacuated glass tube collector modules which provide an effective solar collector aperture of 13,384 square feet. The system consists of the collectors, two 2500 gallon tanks, pumps, an Andover Controls Corporation computerized controller, a large solar optimized Carrier Corporation industrial sized lithium bromide absorption chiller, and associated plumbing. Solar heated water is pumped through the system to the designed public areas such as lobby, lounges, restaurant and hallways. Auxiliary heat is provided by steam and a heat exchanger to supplement the solar heat. The system, its operation sequence, and performance are described.

Harber, H.

1981-09-25T23:59:59.000Z

455

Dynamic performance testing of prototype 3 ton air-cooled carrier absorption chiller  

SciTech Connect

The performance of a prototype 3 ton cooling capacity air-cooled lithium bromide/water absorption chiller was tested using an absorption chiller test facility which was modified to expand its testing capabilities to include air-cooled chillers in addition to water-cooled chillers. Temperatures of the three externally supplied fluid loops: hot water, chilled water, and cooling air, were varied in order to determine the effects this would have on the two principal measures of chiller performance: cooling capacity and thermal coefficient of performance (COP). A number of interrelated factors were identified as contributing to less than expected performance. For comparison, experimental correlations of other investigators for this and other similar absorption chillers are presented. These have been plotted as both contour and three-dimensional performance maps in order to more clearly show the functional dependence of the chiller performance on the fluid loop temperatures.

Borst, R.R.; Wood, B.D.

1985-05-01T23:59:59.000Z

456

Ultrasonic Relaxation in Ethanol?Ethyl Halide Mixtures  

Science Conference Proceedings (OSTI)

Ultrasonic studies in mixtures of ethanol and various ethyl halides show that maxima exist in the plots of the absorption coefficient versus concentration. These maxima are located at relatively small ethanol concentrations. The measurements made include a detailed investigation of the temperature and frequency dependence of the absorption in the ethanol?ethyl chloride system and somewhat less complete studies of the ethanol?ethyl bromide and ethanol?ethyl iodide systems. In each of the systems the measurements were made as a function of concentration. The results in the ethanol?ethyl chloride mixtures indicate the presence of a single relaxation process occurring in the range of measurement (15?165 MHz). The mechanism for this relaxation process is considered both in terms of a quasichemical association theory and in terms of a fluctuating concentration theory. The suggestion is made that the relaxational behavior may be connected with the existence azeotropic concentrations in these mixtures.

V. A. Solovyev; C. J. Montrose; M. H. Watkins; T. A. Litovitz

1968-01-01T23:59:59.000Z

457

The impact of water flow configuration on crystallisation in LiBr/H2O absorption water heater  

SciTech Connect

Lithium Bromide (LiBr) strong solution entering the absorber tends to crystallise when the absorber temperature is increased for a fixed evaporating pressure. This is considered the key technical barrier for the development of a LiBr absorption heat pump water heater. There are several approaches to avoid the crystallisation problem, such as chemical crystallisation inhibitors, heat and mass transfer enhancement and thermodynamic cycle modification. This paper investigates and compares two flow configurations of LiBr absorption heat pump water heater to evaluate the allowable operating conditions for each. The simulation results indicated that introducing the process water through the absorber first results in lower absorber temperature and hence less tendency for crystallisation.

Wang, Kai [ORNL; Abdelaziz, Omar [ORNL; Vineyard, Edward Allan [ORNL

2011-03-01T23:59:59.000Z

458

Direct observation of the terahertz optical free induction decay of molecular rotation absorption lines in the sub-nanosecond time scale  

SciTech Connect

Optical free induction decay (FID) in the region of 60-75 cm{sup -1} was detected using 120 ps pulses of free electron laser. Signals were detected in real time using ultra-fast Schottky diode detectors. The oscillations corresponding to the splitting of absorption lines in deuterated water vapor ({Delta}f = 0.15 cm{sup -1}) and hydrogen bromide ({Delta}f = 0.02 cm{sup -1}) were detected. At high optical density, we observed the oscillations arising from 'top-hat' shape of absorption lines. Free induction decay signals could be detected in a single shot. This observation allowed obtaining a spectrum in one laser pulse, which facilitates studies of very fast processes.

Chesnokov, E. N.; Koshlyakov, P. V. [Institute of Chemical Kinetics and Combustion, Novosibirsk 630090 (Russian Federation); Kubarev, V. V. [Budker Institute of Nuclear Physics, Novosibirsk 630090 (Russian Federation); Novosibirsk State University, Novosibirsk 630090 (Russian Federation); Kulipanov, G. N. [Budker Institute of Nuclear Physics, Novosibirsk 630090 (Russian Federation)

2012-09-24T23:59:59.000Z

459

Comparison of various battery technologies for electric vehicles  

E-Print Network (OSTI)

Battery technologies of different chemistries, manufacture and geometry were evaluated as candidates for use in Electric Vehicles (EV). The candidate batteries that were evaluated include four single cell and seven multi-cell modules representing four technologies; Lead-Acid, Nickel-Cadmium, Nickel-Metal Hydride and Zinc-Bromide. A standard set of testing procedures for electric vehicle batteries, based on industry accepted testing procedures, and any tests which were specific to individual battery types were used in the evaluations. The batteries were evaluated by conducting performance tests, and by subjecting them to cyclical loading, using a computer controlled charge - discharge cycler, to simulate typical EV driving cycles. Criteria for comparison of batteries were: performance, projected vehicle range, cost, and applicability to various types of EVs. The four battery technologies have individual strengths and weaknesses and each is suited to fill a particular application. None of the batteries tested can fill every EV application.

Dickinson, Blake Edward

1993-01-01T23:59:59.000Z

460

FINE GRAIN NUCLEAR EMULSION  

DOE Patents (OSTI)

A method of preparing nuclear track emulsions having mean grain sizes less than 0.1 microns is described. The method comprises adding silver nitrate to potassium bromide at a rate at which there is always a constant, critical excess of silver ions. For minimum size grains, the silver ion concentration is maintained at the critical level of about pAg 2.0 to 5.0 during prectpitation, pAg being defined as the negative logarithm of the silver ion concentration. It is preferred to eliminate the excess silver at the conclusion of the precipitation steps. The emulsion is processed by methods in all other respects generally similar to the methods of the prior art. (AEC)

Oliver, A.J.

1962-04-24T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

A smart control system for electric vehicle batteries  

SciTech Connect

A smart control system for electric vehicle (EV) batteries was designed and its performance was evaluated. The hardware for the system was based on the Motorola MC68HC11ENB micro controller. A zinc bromide (Zn/Br{sub 2}) battery was chosen since it is a good candidate as an EV battery and has a large number of user variable parameters that affect its performance. The flexibility of the system arises from the fact that the system can be programmed to do a wide variety of jobs. The use of real time interrupts and other features makes the system safe for use along with the battery systems. Test data indicates that real time control of the different parameters can increase the performance of the battery by 15%. In addition to optimizing the performance of the battery the control system incorporates essential safety features.

Arikara, M.P.; Dickinson, B.E.; Branum, B. [Texas A and M Univ., College Station, TX (United States). Texas Engineering Experiment Station

1993-12-31T23:59:59.000Z

462

Solar-cooling-system performance, Frenchman's Reef Hotel, St. Thomas, US Virgin Islands. Final report  

SciTech Connect

The Solar Cooling System installed in the Frenchman's Reef Resort Hotel Test Site, St. Thomas, US Virgin Islands, used 956 Sunmaster Corporation evacuated glass tube collector modules which provide an effective solar collector aperture of 13,384 square feet. The system consists of the collectors, two 2500 gallon tanks, pumps, an Andover Controls Corporation computerized controller, a large solar optimized Carrier Corporation industrial sized lithium bromide absorption chiller, and associated plumbing. Solar heated water is pumped through the system to the designed public areas such as lobby, lounges, restaurant and hallways. Auxiliary heat is provided by steam and a heat exchanger to supplement the solar heat. The system, its operation sequence, and performance are described.

Harber, H.

1981-09-25T23:59:59.000Z

463

(129)Xe NMR of Mesoporous Silicas  

DOE Green Energy (OSTI)

The porosities of three mesoporous silica materials were characterized with {sup 129}Xe NMR spectroscopy. The materials were synthesized by a sol-gel process with r = 0, 25, and 70% methanol by weight in an aqueous cetyltrimethylammonium bromide solution. Temperature dependent chemical shifts and spin lattice relaxation times reveal that xenon does not penetrate the pores of the largely disordered (r= 70%) silica. For both r = 0 and 25%, temperature dependent resonances corresponding to physisorbed xenon were observed. An additional resonance for the r = 25% sample was attributed to xenon between the disordered cylindrical pores. 2D NMR exchange experiments corroborate the spin lattice relaxation data which show that xenon is in rapid exchange between the adsorbed and the gas phase.

Anderson, M.T.; Asink, R.A.; Kneller, J.M.; Pietrass, T.

1999-04-23T23:59:59.000Z

464

Importance of counteranions on the hydration structure of the curium ion  

SciTech Connect

Using density functional theory based ab initio molecular dynamics and metadynamics we show that counter ions can trigger noticeable changes in the hydration shell structure of the curium ion. The free energies of curium-water coordination and the solvent hydrogen bond (HB) lifetimes in the absence and presence the counter anions predict that chloride and bromide counter anions strengthen the first shell and consequently the 8-fold coordination state is dominant by at least 98%. In contrast, the perchlorate counter anions are found to weaken the coordination shell and the HB network, with the 9-fold and 8-fold states existing in an 8:1 ratio, which is in good agreement with reported 9:1 ratio seen in time resolved fluorescence spectroscopy experiments. To our knowledge this is the first time molecular simulations have shown that counter anions can directly affect the first hydration shell structure of a cation.

Atta Fynn, Raymond; Bylaska, Eric J.; De Jong, Wibe A.

2013-07-04T23:59:59.000Z

465

Weak-link capacitor  

Science Conference Proceedings (OSTI)

A process for making a dielectric material where a precursor polymer selected from poly(phenylene vinylene) polyacetylene, poly(p-phenylene), poly(thienylene vinylene), poly(1,4-naphthylene vinylene), and poly(p-pyridine vinylene) is energized said by exposure by radiation or increase in temperature to a level sufficient to eliminate said leaving groups contained within the precursor polymer, thereby transforming the dielectric material into a conductive polymer. The leaving group in the precursor polymer can be a chloride, a bromide, an iodide, a fluoride, an ester, an xanthate, a nitrile, an amine, a nitro group, a carbonate, a dithiocarbamate, a sulfonium group, an oxonium group, an iodonium group, a pyridinium group, an ammonium group, a borate group, a borane group, a sulphinyl group, or a sulfonyl group.

Dirk, Shawn M. (Albuquerque, NM); Johnson, Ross S. (Albuquerque, NM); Wheeler, David R. (Albuquerque, NM); Bogart, Gregory R. (Corrales, NM)

2011-06-07T23:59:59.000Z

466

Weak-link capacitor  

DOE Patents (OSTI)

A process for making a dielectric material where a precursor polymer selected from poly(phenylene vinylene)polyacetylene, poly(p-phenylene), poly(thienylene vinylene), poly(1,4-naphthylene vinylene), and poly(p-pyridine vinylene) is energized said by exposure by radiation or increase in temperature to a level sufficient to eliminate said leaving groups contained within the precursor polymer, thereby transforming the dielectric material into a conductive polymer. The leaving group in the precursor polymer can be a chloride, a bromide, an iodide, a fluoride, an ester, an xanthate, a nitrile, an amine, a nitro group, a carbonate, a dithiocarbamate, a sulfonium group, an oxonium group, an iodonium group, a pyridinium group, an ammonium group, a borate group, a borane group, a sulphinyl group, or a sulfonyl group.

Dirk, Shawn M.; Johnson, Ross S.; Wheeler, David R.; Bogart, Gregory R.

2013-04-23T23:59:59.000Z

467

Electrochemical cell  

DOE Patents (OSTI)

An electrochemical cell is described having a bimodal positive electrode, a negative electrode of an alkali metal, and a compatible electrolyte including an alkali metal salt molten at the cell operating temperature. The positive electrode has an electrochemically active layer of at least one transition metal chloride at least partially present as a charging product, and additives of bromide and/or iodide and sulfur in the positive electrode or the electrolyte. Electrode volumetric capacity is in excess of 400 Ah/cm{sup 3}; the cell can be 90% recharged in three hours and can operate at temperatures below 160 C. There is also disclosed a method of reducing the operating temperature and improving the overall volumetric capacity of an electrochemical cell and for producing a positive electrode having a BET area greater than 6{times}10{sup 4}cm{sup 2}/g of Ni. 6 figs.

Redey, L.I.; Vissers, D.R.; Prakash, J.

1996-07-16T23:59:59.000Z

468

Electrochemical cell  

DOE Patents (OSTI)

An electrochemical cell having a bimodal positive electrode, a negative electrode of an alkali metal, and a compatible electrolyte including an alkali metal salt molten at the cell operating temperature. The positive electrode has an electrochemically active layer of at least one transition metal chloride at least partially present as a charging product, and additives of bromide and/or iodide and sulfur in the positive electrode or the electrolyte. Electrode volumetric capacity is in excess of 400 Ah/cm.sup.3 ; the cell can be 90% recharged in three hours and can operate at temperatures below 160.degree. C. There is also disclosed a method of reducing the operating temperature and improving the overall volumetric capacity of an electrochemical cell and for producing a positive electrode having a BET area greater than 6.times.10.sup.4 cm.sup.2 /g of Ni.

Redey, Laszlo I. (Downers Grove, IL); Vissers, Donald R. (Naperville, IL); Prakash, Jai (Downers Grove, IL)

1994-01-01T23:59:59.000Z

469

Electrochemical cell  

DOE Patents (OSTI)

An electrochemical cell having a bimodal positive electrode, a negative electrode of an alkali metal, and a compatible electrolyte including an alkali metal salt molten at the cell operating temperature. The positive electrode has an electrochemically active layer of at least one transition metal chloride at least partially present as a charging product, and additives of bromide and/or iodide and sulfur in the positive electrode or the electrolyte. Electrode volumetric capacity is in excess of 400 Ah/cm.sup.3 ; the cell can be 90% recharged in three hours and can operate at temperatures below 160.degree. C. There is also disclosed a method of reducing the operating temperature and improving the overall volumetric capacity of an electrochemical cell and for producing a positive electrode having a BET area greater than 6.times.10.sup.4 cm.sup.2 /g of Ni.

Redey, Laszlo I. (6851 Carpenter St., Downers Grove, IL 60516); Vissers, Donald R. (611 Clover Ct., Naperville, IL 60540); Prakash, Jai (2205 Arbor Cir. 8, Downers Grove, IL 60515)

1996-01-01T23:59:59.000Z

470

Test report : Milspray Scorpion energy storage device.  

Science Conference Proceedings (OSTI)

The Department of Energy Office of Electricity (DOE/OE), Sandia National Laboratory (SNL) and the Base Camp Integration Lab (BCIL) partnered together to incorporate an energy storage system into a microgrid configured Forward Operating Base to reduce the fossil fuel consumption and to ultimately save lives. Energy storage vendors have supplied their systems to SNL Energy Storage Test Pad (ESTP) for functional testing and a subset of these systems were selected for performance evaluation at the BCIL. The technologies tested were electro-chemical energy storage systems comprised of lead acid, lithium-ion or zinc-bromide. MILSPRAY Military Technologies has developed an energy storage system that utilizes lead acid batteries to save fuel on a military microgrid. This report contains the testing results and some limited assessment of the Milspray Scorpion Energy Storage Device.

Rose, David Martin; Schenkman, Benjamin L.; Borneo, Daniel R.

2013-08-01T23:59:59.000Z

471

Tapanuli Organoclay Addition Into Linear Low Density Polyethylene-Pineapple Fiber Composites  

Science Conference Proceedings (OSTI)

Linear low density polyethylene-Tapanuli organoclay-pineapple fiber composites were succesfully synthesized by a melt intercalation method. The clay was modified as an organoclay by a cation exchange reaction using hexadecyl trimethyl ammonium bromide (HDTMABr) surfactant. The X-ray diffraction results of the organoclay exhibited a higher basal spacing of 1.87 nm compared to the unmodified clay of 1.46 nm. The composite tensile strength was enhanced up to 46.4% with the 1 wt% organoclay addition. Both tensile and flexural moduli increased up to 150.6% and 43% with the 3 wt% organoclay addition to the composites. However, the flexural strength of the composites was not improved with the organoclay addition. The addition of organoclay has also decreased the heat deflection temperature of the composites.

Adawiyah, Robiatul; Juwono, Ariadne L. [Department of Physics, Faculty of Mathematics and Natural Sciences, University of Indonesia, Depok 16424 (Indonesia); Roseno, Seto [Center of Material Technology, Agency for Assessment and Application of Technology, Jl. M.H. Thamrin No.8, Jakarta 10340 (Indonesia)

2010-12-23T23:59:59.000Z

472

Sum Frequency Generation Vibrational Spectroscopy of Pyridine Hydrogenation on Platinum Nanoparticles  

DOE Green Energy (OSTI)

Pyridine hydrogenation in the presence of a surface monolayer consisting of cubic Pt nanoparticles stabilized by tetradecyltrimethylammonium bromide (TTAB) was investigated by sum frequency generation (SFG) vibrational spectroscopy using total internal reflection (TIR) geometry. TIR-SFG spectra analysis revealed that a pyridinium cation (C{sub 5}H{sub 5}NH{sup +}) forms during pyridine hydrogenation on the Pt nanoparticle surface, and the NH group in the C{sub 5}H{sub 5}NH{sup +} cation becomes more hydrogen bound with the increase of the temperature. In addition, the surface coverage of the cation decreases with the increase of the temperature. An important contribution of this study is the in situ identification of reaction intermediates adsorbed on the Pt nanoparticle monolayer during pyridine hydrogenation.

Bratlie, Kaitlin M.; Komvopoulos, Kyriakos; Somorjai, Gabor A.

2008-02-22T23:59:59.000Z

473

PROCESSING OF URANIUM-METAL-CONTAINING FUEL ELEMENTS  

DOE Patents (OSTI)

A process is given for recovering uranium from neutronbombarded uranium- aluminum alloys. The alloy is dissolved in an aluminum halide--alkali metal halide mixture in which the halide is a mixture of chloride and bromide, the aluminum halide is present in about stoichiometric quantity as to uranium and fission products and the alkali metal halide in a predominant quantity; the uranium- and electropositive fission-products-containing salt phase is separated from the electronegative-containing metal phase; more aluminum halide is added to the salt phase to obtain equimolarity as to the alkali metal halide; adding an excess of aluminum metal whereby uranium metal is formed and alloyed with the excess aluminum; and separating the uranium-aluminum alloy from the fission- productscontaining salt phase. (AEC)

Moore, R.H.

1962-10-01T23:59:59.000Z

474

Mesoporous Silica Nanoparticles Loaded with Surfactant: Low Temperature Magic Angle Spinning 13C and 29Si NMR Enhanced by Dynamic Nuclear Polarization  

SciTech Connect

We show that dynamic nuclear polarization (DNP) can be used to enhance NMR signals of 13C and 29Si nuclei located in mesoporous organic/inorganic hybrid materials, at several hundreds of nanometers from stable radicals (TOTAPOL) trapped in the surrounding frozen disordered water. The approach is demonstrated using mesoporous silica nanoparticles (MSN), functionalized with 3-(N-phenylureido)propyl (PUP) groups, filled with the surfactant cetyltrimethylammonium bromide (CTAB). The DNP-enhanced proton magnetization is transported into the mesopores via 1H–1H spin diffusion and transferred to rare spins by cross-polarization, yielding signal enhancements ?on/off of around 8. When the CTAB molecules are extracted, so that the radicals can enter the mesopores, the enhancements increase to ?on/off ? 30 for both nuclei. A quantitative analysis of the signal enhancements in MSN with and without surfactant is based on a one-dimensional proton spin diffusion model. The effect of solvent deuteration is also investigated.

Lafon, Olivier [Universite de Lille Nord de France; Thankamony, Aany S. Lilly [Universite de Lille Nord de France; Kokayashi, Takeshi [Ames Laboratory; Carnevale, Diego [Ecole Polytechnique Federale de Lausanne; Vitzthum, Veronika [Ecole Polytechnique Federale de Lausanne; Slowing, Igor I. [Ames Laboratory; Kandel, Kapil [Ames Laboratory; Vezin, Herve [Universite de Lille Nord de France; Amoureux, Jean-Paul [Universite de Lille Nord de France; Bodenhausen, Geoffrey [Ecole Polytechnique Federale de Lausanne; Pruski, Marek [Ames Laboratory

2012-12-21T23:59:59.000Z

475

Testing of Crystallization Temperature of a New Working Fluid for Absorption Heat Pump Systems  

SciTech Connect

Lithium bromide/water (LiBr/water) absorption systems are potential candidates for absorption heat pump water heating applications since they have been widely commercialized for cooling applications. One drawback to LiBr/water absorption water heater systems is that they are unable to operate at typical water heating temperatures due to solution crystallization hazards. Binary or ternary mixtures, serving as working fluids, were reported (Ally, 1988; Herold et al., 1991; Iyoki and Uemura, 1981; Yasuhide Nemoto et al., 2010; Zogg et al., 2005) to help improve the absorption performance or avoid crystallization of absorption heat pump systems. A recent development (De Lucas et al., 2007) investigated the use of a ternary mixture of aqueous mixture of lithium bromide and sodium formate (CHO2Na). The new working fluid composition maintains a ratio of LiBr/CHO2Na of 2 by weight. This new working fluid is a potential competitor to aqueous LiBr solution in absorption system due to higher water vapor absorption rates and lower generation temperature needed (De Lucas et al., 2004). There exists data on equilibrium performance and other physical properties of this new working fluid. However, there is no available data on crystallization behavior. Crystallization temperature is crucial for the design of absorption heat pump water heater in order to avoid crystallization hazards during operation. We have therefore conducted a systematic study to explore the crystallization temperature of LiBr/CHO2Na water solution and compared it against aqueous LiBr solutions. These results were then used to evaluate the feasibility of using the new working fluid in water heating applications showing limited potential.

Wang, Kai [ORNL; Kisari, Padmaja [ORNL; Abdelaziz, Omar [ORNL; Vineyard, Edward Allan [ORNL

2010-01-01T23:59:59.000Z

476

Lamellar {gamma}-AlOOH architectures: Synthesis and application for the removal of HCN  

Science Conference Proceedings (OSTI)

Using hexadecyl trimethyl ammonium bromide (CTAB) as a structure-directing agent and precipitator, the complete synthesis of lamellar {gamma}-AlOOH architectures was successfully accomplished via a hydrothermal route. Different product structures were obtained by varying the molar ratio of aluminum nitrate and CTAB. Several techniques, including X-ray powder diffraction, Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, and differential scanning calorimetry thermal analysis, were used to characterize the products. The effects of CTAB concentration, reaction temperature and time, and the molar ratio of Al{sup 3+}/CTAB on the product morphologies were investigated. The nitrogen adsorption and desorption measurements indicated that the {gamma}-AlOOH architectures possess a Brunauer-Emmett-Teller surface area of approximately 75.02 m{sup 2}/g. It was also demonstrated that 10 mg {gamma}-AlOOH architectures can remove 45.3% of the HCN (1.68 {mu}g/mL) from model wastewater. When 0.03 mg/cig {gamma}-AlOOH architectures were combined with cigarette paper, 8.12% of the present HCN was adsorbed. These results indicate that lamellar {gamma}-AlOOH architectures may be a potential adsorbent for removing HCN from highly toxic pollutant solutions and harmful cigarette smoke. Highlights: Black-Right-Pointing-Pointer Hexadecyl trimethyl ammonium bromide (CTAB) was used as a structure-directing agent and precipitator. Black-Right-Pointing-Pointer Hydrothermal treatment enables growth of lamellar {gamma}-AlOOH architectures. Black-Right-Pointing-Pointer Lamellar {gamma}-AlOOH architectures were demonstrated to exhibit high BET surface area and excellent adsorptive capacity. Black-Right-Pointing-Pointer HCN in contaminated water and cigarette smoke can be effectively removed by the prepared lamellar {gamma}-AlOOH superstructures.

Hou Hongwei, E-mail: houhw@ztri.com.cn [China National Tobacco Quality Supervision and Test Center, No. 2 Fengyang Street, Zhengzhou High and New Technology Industries Development Zone, Zhengzhou, 450001 (China); Zhu You [China National Tobacco Corporation Shandong Branch (China); China National Tobacco Corporation Shandong Corporation (China); Tang Gangling [China National Tobacco Quality Supervision and Test Center, No. 2 Fengyang Street, Zhengzhou High and New Technology Industries Development Zone, Zhengzhou, 450001 (China); Hu Qingyuan, E-mail: huqy@ztri.com.cn [China National Tobacco Quality Supervision and Test Center, No. 2 Fengyang Street, Zhengzhou High and New Technology Industries Development Zone, Zhengzhou, 450001 (China)

2012-06-15T23:59:59.000Z

477

Responsive copolymers for enhanced petroleum recovery. Second annual report  

SciTech Connect

The authors describe second year efforts in synthesis, characterization, and rheology to develop polymers with significantly improved efficiency in mobility control and conformance. These advanced polymer systems would maintain high viscosities or behave as virtual gels under low shear conditions and at elevated electrolyte concentrations. At high fluid shear rates, associates would deaggregate yielding low viscosity solutions, reducing problems of shear degradation or face plugging during injection. Polymeric surfactants were also developed with potential for use in higher salt, higher temperature reservoirs for mobilization of entrapped oil. Chapters include: Ampholytic terpolymers of acrylamide with sodium 3-acrylamido-3-methylbutanoate and 2-acrylamido-2-methylpropanetrimethylammonium chloride; Hydrophilic sulfobetaine copolymers of acrylamide and 3-(2-acrylamido-methylpropane-dimethylammonio)-1-propanesulfonate; Copolymerization of maleic anhydride and N-vinylformamide; Reactivity ratio of N-vinylformamide with acrylamide, sodium acrylate, and n-butyl acrylate; Effect of the distribution of the hydrophobic cationic monomer dimethyldodecyl(2-acrylamidoethyl)ammonium bromide on the solution behavior of associating acrylamide copolymers; Effect of surfactants on the solution properties of amphipathic copolymers of acrylamide and N,N-dimethyl-N-dodecyl-N-(2-acrylamidoethyl)ammonium bromide; Associative interactions and photophysical behavior of amphiphilic terpolymers prepared by modification of maleic anhydride/ethyl vinyl ether copolymers; Copolymer compositions of high-molecular-weight functional acrylamido water-soluble polymers using direct-polarization magic-angle spinning {sup 13}C NMR; Use of factorial experimental design in static and dynamic light scattering characterization of water soluble polymers; and Porous medium elongational rheometer studies of NaAMB/AM copolymer solutions.

McCormick, C.; Hester, R.

1995-05-01T23:59:59.000Z

478

Investigation of groundwater recirculation for the removal of RDX from the Pantex Plant perched aquifer  

SciTech Connect

The Pantex Plant near Amarillo, Texas, is a US Department of Energy (DOE) facility that has been in operation since 1942. Past and present operations at Pantex include the creation of chemical high explosives components for nuclear weapons and assembly and disassembly of nuclear weapons. The Pantex Plant is underlain by the Ogallala aquifer, which in this area, consists of the main water-bearing unit and a perched water zone. These are separated by a fine-grained zone of low permeability. Multiple contaminant plumes containing high explosive (HE) compounds have been detected in the perched aquifer beneath the plant. The occurrence of these contaminants is the result of past waste disposal practices at the facility. RDX is an HE compound, which has been detected in the groundwater of the perched aquifer at significant concentrations. A pilot-scale, dual-phase extraction treatment system has been installed at one location at the plant, east of Zone 12, to test the effectiveness of such a system on the removal of these contaminants from the subsurface. A tracer test using a conservative tracer, bromide (Br), was conducted at the treatment site in 1996. In addition to the bromide, RDX and water elevations in the aquifer were monitored. Using data from the tracer test and other relevant data from the investigations at Pantex, flow and contaminant transport in the perched aquifer were simulated with groundwater models. The flow was modeled using MODFLOW and the transport of contaminants in the aqueous phase was modeled using MT3D. Modeling the perched aquifer had been conducted to characterize the flow in the perched aquifer; estimate RDX retardation in the perched aquifer; and evaluate the use of groundwater re-circulation to enhance the extraction of RDX from the perched aquifer.

Woods, A.L. [ed.; Barnes, D.L. [Amarillo National Resource Center for Plutonium, TX (United States); Boles, K.M.; Charbeneau, R.J. [Univ. of Texas, Austin, TX (United States); Black, S.; Rainwater, K. [Texas Tech Univ., Lubbock, TX (United States). Water Resources Center

1998-07-01T23:59:59.000Z

479

Ultraviolet absorbing copolymers  

DOE Patents (OSTI)

Photostable and weather stable absorping copolymers have been prepared from acrylic esters such as methyl methacrylate containing 0.1 to 5% of an 2-hydroxy-allyl benzophenone, preferably the 4,4' dimethoxy derivative thereof. The pendant benzophenone chromophores protect the acrylic backbone and when photoexcited do not degrade the ester side chain, nor abstract hydrogen from the backbone.

Gupta, Amitava (Pasadena, CA); Yavrouian, Andre H. (La Crescenta, CA)

1982-01-01T23:59:59.000Z

480

Metal resistance sequences and transgenic plants  

DOE Patents (OSTI)

The present invention provides nucleic acid sequences encoding a metal ion resistance protein, which are expressible in plant cells. The metal resistance protein provides for the enzymatic reduction of metal ions including but not limited to divalent Cu, divalent mercury, trivalent gold, divalent cadmium, lead ions and monovalent silver ions. Transgenic plants which express these coding sequences exhibit increased resistance to metal ions in the environment as compared with plants which have not been so genetically modified. Transgenic plants with improved resistance to organometals including alkylmercury compounds, among others, are provided by the further inclusion of plant-expressible organometal lyase coding sequences, as specifically exemplified by the plant-expressible merB coding sequence. Furthermore, these transgenic plants which have been genetically modified to express the metal resistance coding sequences of the present invention can participate in the bioremediation of metal contamination via the enzymatic reduction of metal ions. Transgenic plants resistant to organometals can further mediate remediation of organic metal compounds, for example, alkylmetal compounds including but not limited to methyl mercury, methyl lead compounds, methyl cadmium and methyl arsenic compounds, in the environment by causing the freeing of mercuric or other metal ions and the reduction of the ionic mercury or other metal ions to the less toxic elemental mercury or other metals.

Meagher, Richard Brian (Athens, GA); Summers, Anne O. (Athens, GA); Rugh, Clayton L. (Athens, GA)

1999-10-12T23:59:59.000Z

Note: This page contains sample records for the topic "74-83-9 methyl bromide" 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

Lichtgesteuerte Proteinfragmente knnen Onkogene ein-und ausschalten Publikation in ,,Angewandte Chemie", International Edition  

E-Print Network (OSTI)

chemis- try) and molecular probes (chemical genetics). Medicinal chemistry and chemical genetics (*), and methylated ruthenium complex Me1-OH (!). Angewandte Chemie 3Angew. Chem. Int. Ed. 0000, 00, 0 ­ 0 www. Angewandte Chemie 5Angew. Chem. Int. Ed. 0000, 00, 0 ­ 0 www.angewandte.org 2005 Wiley-VCH Verlag GmbH & Co

Arndt, Katja

482

Selection of best neural network for estimating properties of diesel-biodiesel blends  

Science Conference Proceedings (OSTI)

Soybean oil was transesterified with methanol in the presence of alkaline catalyst to produce methyl esters commonly known as biodiesel. Biodiesel and diesel blends were prepared and tested in laboratory for flash point, fire point, viscosity and density. ... Keywords: artificial neural network, biodiesel, density, fire point, flash point, transesterification, viscosity

Jatinder Kumar; Ajay Bansal

2007-02-01T23:59:59.000Z

483

Fuel-Cycle Energy and Emission Impacts of Ethanol-Diesel Blends in Urban Buses and Farming Tractors  

E-Print Network (OSTI)

...................................................................................................................................... 14 Nitrous Oxide Emissions from Nitrogen Fertilizer Applications in Corn Fields........................................................ 34 Appendix B: Nitrous Oxide Emissions from Nitrogen Fertilizer Applications in Corn Fields) LHV lower heating value LPG liquefied petroleum gas LS low-sulfur LSD low-sulfur diesel MTBE methyl

Argonne National Laboratory

484

Hydridomethyl iridium complex  

DOE Patents (OSTI)

A process for functionalizing methane comprising: (a) reacting methane with a hydridoalkyl metal complex of the formula: CpIr[P(R.sub.1).sub.3 ]H(R.sub.2) wherein Cp represents a cyclopentadienyl or alkylcyclopentadienyl radical having from 1 to 5 carbon atoms; Ir represents an iridium atom; P represents a phosphorus atom; R.sub.1 represents an alkyl group; R.sub.2 represents an alkyl group having at least two carbon atoms; and H represents a hydrogen atom, in the presence of a liquid alkane R.sub.3 H having at least three carbon atoms to form a hydridomethyl complex of the formula: CpIr[P(R.sub.1).sub.3 ]HMe where Me represents a methyl radical. (b) reacting said hydridomethyl complex with an organic halogenating agent such as a tetrahalomethane or a haloform of the formulas: CX'X"X'"X"" or CHX'X"X'"; wherein X', X", X"', and X"" represent halogens selected from bromine, iodine and chlorine, to halomethyl complex of step (a) having the formula: CpIr[P(R.sub.1).sub.3 ]MeX: (c) reacting said halomethyl complex with a mercuric halide of the formula HgX.sub.2 to form a methyl mercuric halide of the formula HgMeX; and (d) reacting said methyl mercuric halide with a molecular halogen of the formula X.sub.2 to form methyl halide.

Bergman, Robert G. (P.O. Box 7141, San Francisco, CA 94120-7141); Buchanan, J. Michael (P.O. Box 7141, San Francisco, CA 94120-7141); Stryker, Jeffrey M. (P.O. Box 7141, San Francisco, CA 94120-7141); Wax, Michael J. (P.O. Box 7141, San Francisco, CA 94120-7141)

1989-01-01T23:59:59.000Z

485

Occurrence and Potential Human-Health Relevance of Volatile Organic Compounds in Drinking Water from Domestic Wells in the United States  

E-Print Network (OSTI)

, Laboratory Reporting Level MCL, Maximum Contaminant Level MRL, Maximum Reporting Level MTBE, Methyl tert Figures 3 #12;Abstract BACKGROUND: As the population and demand for safe drinking water from domestic concentrations to U.S. EPA Maximum Contaminant Levels (MCLs) and Health-Based Screening Levels. RESULTS: VOCs

486

Anaerobic O-demethylation of phenylmethylethers  

DOE Green Energy (OSTI)

Anaerobic O-demethylation (AOD) of phenylmethylethers is a process of both basic and applied significance. The aryl-O-methyl ethers are abundant in natural products, particularly as components of lignin. They are present as methoxylated lignin monomers in anaerobic environments and can be completely degraded there by mixed microbial populations. AOD is an essential early step in this process, and it is also a key reaction in the utilization of the O-methyl substituent as a C-one substrate by acetogens. An understanding of the AOD reaction mechanism might suggest new ways in which chemicals could be derived from lignocellulosic materials. The biochemical mechanism for the anaerobic cleavage of the aryl-O-methyl ether bond is an intriguing, but relatively unexplored process. In contrast to aerobic O-demethylating enzymes, AOD appears to involve methyl group transfer. Thus, novel biochemical information on an important biotransformation reaction will be gained from the research proposed. Recently, we have shown that AOD activity is inducible and have developed an assay for detecting AOD activity in cell-free extracts of Acetobacterium woodii. AOD activity is stimulated in vitro by the addition of ATP (1mM) and pyruvate (30 mM), the K{sub M} for vanillate being 0.4 mM. In collaboration with protein purification experts, we proposed to purify the AOD enzyme and characterize the protein(s) and the enzymatic reaction involved. 8 figs., 5 tabs.

Frazer, A.C.; Young, L.Y.

1990-01-01T23:59:59.000Z

487

Catalytic applications of mono- and dinuclear complexes containing metal-carbon sigma bonds. Final report, November 1, 1993--October 31, 1996  

SciTech Connect

This report discusses results from several studies involved in the project. Investigations include: vibrational models for surface olefins and alkylidenes; mechanism of the formation and fragmentation of diosmacyclobutanes; reaction of dienes and allenes with diosmacyclobutanes; determination by nematic phase NMR of the structure of mononuclear and dinuclear ethylene complexes of osmium; and generation of ``coordinatively unsaturated`` complexes by protonation of methyl osmium complexes.

Norton, J.R.

1996-12-31T23:59:59.000Z

488

JOURNAL DE PHYSIQUE Colloque C3, supplement au n09, Tome 48, septembre 1987  

E-Print Network (OSTI)

-jet polished in 3:l methyl alcoho1:nitric acid at -18% and 25 VDC. The micrographs and convergent beam elect corrosion cracking resistance. This phase's reactivity with seawater appears to promote dissolution range from unacceptable to acceptable for high performance aero- space structures. INTRODUCTION Aluminum

Paris-Sud XI, Université de

489

news and views 570 nature structural biology volume 8 number 7 july 2001  

E-Print Network (OSTI)

sequences and the requirement that they multimerize for tight binding. Almost all SAND domains are located of methylation interference experiments performed on the GMEB13 and DEAF-13 SAND domain containing proteins like the SAND domain been seen before? One can specu- late that this fold may not be ideally suited

Lim, Wendell

490

Chemical Engineering Science 57 (2002) 45954604 www.elsevier.com/locate/ces  

E-Print Network (OSTI)

synthesis gas intermediates via steam reforming and partial oxidation, direct CH4 conver- sion reactions and optimization of catalysts and membrane reactors for the non-oxidative conversion of methane Lin Lia;b, Richard that activate methane to form methyl radicals or ethene and the conversion of ethene to aromatics increased

Iglesia, Enrique

491

Energetics of Adsorbed CH3 and CH on Pt(111) by Calorimetry: Dissociative Adsorption of CH3I  

E-Print Network (OSTI)

oxidation of methane, steam reforming, combustion and selective oxidations of methane and various other of formation, the enthalpy for the dissociation of adsorbed methane to adsorbed methyl coadsorbed + 2 Had was found to be uphill by between +4 and +23 kJ/mol. Measured methane yields (which require

Campbell, Charles T.

492

I. Pt-Catalyzed Tandem Epoxide Fragmentation/Pentannulation of Propargylic Esters II. Progress Toward the Kopsia Family of Indole Alkaloids  

E-Print Network (OSTI)

N H NO 2 BnO N H xylenes, catechol BnO N H 2 , Pd/C NH 2 BnOBnO N H NO 2 BnO N H xylenes, catechol 3-(2-Nitroethyl)-5-1.1 equiv. ), and 3-methyl-catechol (250 mg, 2.3 mmol, 0.1

Pujanauski, Brian Gerard

2010-01-01T23:59:59.000Z

493

IU ChemIstry Vol. 52 College of Arts & sciences Alumni Association Fall 2007  

E-Print Network (OSTI)

skill. The COMT gene codes for the Catechol-O-methyltransferase enzyme, which metabolizes released effects of the catechol-O-methyl- transferase gene Val158/108Met polymorphism. Biological Psychiatry, 64, S., Kolachana, B.S., Egan, M.F., Goldberg, T.E., & Weinberger, D.R. (2005). Effect of catechol- O

Indiana University

494

The impact of genetic variation in comt and bdnf on resting-state functional connectivity  

Science Conference Proceedings (OSTI)

Genetic imaging techniques allow investigation of the mechanisms by which genetic variants influence brain structure and function. The default mode network (DMN) is characterized by a default state of neuronal activity in the brain that is linked to ... Keywords: brain-derived neurotrophic factor, catechol-O-methyl transferase, default mode network, functional neuroimaging, genetic polymorphism, resting-state connectivity

Joon Hwan Jang; Je-Yeon Yun; Wi Hoon Jung; Geumsook Shim; Min Soo Byun; Jae Yeon Hwang; Sung Nyun Kim; Chi-Hoon Choi; Jun Soo Kwon

2012-03-01T23:59:59.000Z

495

Solvent Extraction of Chemical Attribution Signature Compounds from Painted Wall Board: Final Report  

DOE Green Energy (OSTI)

This report summarizes work that developed a robust solvent extraction procedure for recovery of chemical attribution signature (CAS) compound dimethyl methyl phosphonate (DMMP) (as well as diethyl methyl phosphonate (DEMP), diethyl methyl phosphonothioate (DEMPT), and diisopropyl methyl phosphonate (DIMP)) from painted wall board (PWB), which was selected previously as the exposed media by the chemical attribution scientific working group (CASWG). An accelerated solvent extraction approach was examined to determine the most effective method of extraction from PWB. Three different solvent systems were examined, which varied in solvent strength and polarity (i.e., 1:1 dichloromethane : acetone,100% methanol, and 1% isopropanol in pentane) with a 1:1 methylene chloride : acetone mixture having the most robust and consistent extraction for four original target organophosphorus compounds. The optimum extraction solvent was determined based on the extraction efficiency of the target analytes from spiked painted wallboard as determined by gas chromatography x gas chromatography mass spectrometry (GCxGC-MS) analysis of the extract. An average extraction efficiency of approximately 60% was obtained for these four compounds. The extraction approach was further demonstrated by extracting and detecting the chemical impurities present in neat DMMP that was vapor-deposited onto painted wallboard tickets.

Wahl, Jon H.; Colburn, Heather A.

2009-10-29T23:59:59.000Z

496

Ris Energy Report 5 Renewable-based fuels for transport 4 Introduction  

E-Print Network (OSTI)

by avoiding distribution, but at the risk of a range of quality if pro- duced on a small scale [3]. Biodiesel Converting vegetable oils to biodiesel is a common ap- proach to overcome the problems with direct use of veg esters with properties similar to mineral diesel and some glyc- erine by-product. Usually as a methyl

497

As Global energy consumption rises, more research is being conducted towards alternative renewable  

E-Print Network (OSTI)

the combustion properties of each fatty acid in biodiesel. Simulating methyl oleate as 100% biodiesel would allow renewable fuels. · Combustion modeling is being used to simulate biodiesel combustion in diesel engines. · Simulating biodiesel combustion to obtain combustion data relevant to real world applications, can be very

Hutcheon, James M.

498

Synthesis of DiamidoPyrrolyl Molybdenum Complexes Relevant to Reduction of Dinitrogen to Ammonia  

E-Print Network (OSTI)

A potentially useful trianionic ligand for the reduction of dinitrogen catalytically by molybdenum complexes is one in which one of the arms in a [(RNCH2CH2)3N]3? ligand is replaced by a 2-mesitylpyrrolyl-?-methyl arm, ...

Chin, J. M.

499

Cell-Trappable Quinoline-Derivatized Fluoresceins for Selective and Reversible Biological Zn(II) Detection  

E-Print Network (OSTI)

The synthesis and spectroscopic characterization of two new, cell-trappable fluorescent probes for Zn(II) are presented. These probes, 2-(4,5-bis(((6-(2-ethoxy-2-oxoethoxy)quinolin-8-yl)amino)methyl)-6-hydroxy-3-oxo-3H-8 ...

McQuade, Lindsey E.

500

Impact of Solvent on Photocatalytic Mechanisms: Reactions of Photodesorption Products with Ice Overlayers on the TiO2(110) Surface  

DOE Green Energy (OSTI)

The effects of water and methanol ice overlayers on the photodecomposition of acetone on rutile TiO2(110) were evaluated in ultrahigh vacuum (UHV) using photon stimulated desorption (PSD) and temperature programmed desorption (TPD). In the absence of ice overlayers, acetone photodecomposed on TiO2(110) at 95 K by ejection of a methyl radical into the gas phase and formation of acetate on the surface. With ice overlayers, the methyl radicals are trapped at the interface between TiO2(110) and the ice. When water ice was present, these trapped methyl radicals reacted either with each other to form ethane or with other molecules in the ice (e.g., water or displaced acetone) to form methane (CH4), ethane (CH3CH3) and other products (e.g., methanol), with all of these products trapped in the ice. The new products were free to revisit the surface or depart during desorption of the ice. When methanol ice was present, methane formation came about only from reaction of trapped methyl radicals with the methanol ice. Methane and ethane slowly leaked through methanol ice overlayers into vacuum at 95 K, but not through water ice overlayers. Different degrees of site competition between water and acetone, and between methanol and acetone led to different hydrogen abstraction pathways in the two ices. These results provide new insights into product formation routes and solution-phase radical formation mechanisms that are important in heterogeneous photocatalysis.

Shen, Mingmin; Henderson, Michael A.

2011-04-07T23:59:59.000Z