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Title: Capable Cross-Links: Polymersomes Reinforced with Catalytically Active Metal?Ligand Bonds.


Abstract not provided.

; ; ;  [1]
  1. (NMSU)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the CM4 held August 30-31, 2016 in Albuquerque, NM.
Country of Publication:
United States

Citation Formats

Paxton, Walter F, Henderson, Ian M., Quintana, Hope, and Martinez, Julio. Capable Cross-Links: Polymersomes Reinforced with Catalytically Active Metal?Ligand Bonds.. United States: N. p., 2016. Web.
Paxton, Walter F, Henderson, Ian M., Quintana, Hope, & Martinez, Julio. Capable Cross-Links: Polymersomes Reinforced with Catalytically Active Metal?Ligand Bonds.. United States.
Paxton, Walter F, Henderson, Ian M., Quintana, Hope, and Martinez, Julio. Thu . "Capable Cross-Links: Polymersomes Reinforced with Catalytically Active Metal?Ligand Bonds.". United States. doi:.
title = {Capable Cross-Links: Polymersomes Reinforced with Catalytically Active Metal?Ligand Bonds.},
author = {Paxton, Walter F and Henderson, Ian M. and Quintana, Hope and Martinez, Julio},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2016},
month = {Thu Sep 01 00:00:00 EDT 2016}

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  • The mechanism by which the ferredoxin-thioredoxin system activates the target enzyme, NADP-malate dehydrogenase, was investigated by analyzing the sulfhydryl status of individual protein components with (/sup 14/C)iodoacetate and monobromobimane. The data indicate that ferredoxin-thioredoxin reductase (FTR)--an iron-sulfur enzyme present in oxygenic photosynthetic organisms--is the first member of a thiol chain that links light to enzyme regulation. FTR possesses a catalytically active dithiol group localized on the 13 kDa (similar) subunit, that occurs in all species investigated and accepts reducing equivalents from photoreduced ferredoxin and transfers them stoichiometrically to the disulfide form of thioredoxin m. The reduced thioredoxin m, in turn,more » reduces NADP-malate dehydrogenase, thereby converting it from an inactive (S-S) to an active (SH) form. The means by which FTR is able to combine electrons (from photoreduced ferredoxin) with protons (from the medium) to reduce its active disulfide group remains to be determined.« less
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  • The electronic structures of a series of dinuclear uranium(V) complexes have been investigated using X{alpha}-SW molecular orbital calculations including quasirelativistic corrections. Complexes of the formula U{sub 2}H{sub 10} and U{sub 2}(OH){sub 10} were used to model the metal-ligand {sigma} and {pi} interactions, respectively, in the known species U{sub 2}(O-i-Pr){sub 10}. Two basic geometries were investigated: a vertex-sharing bioctahedron with only terminal ligands (D{sub 4h} symmetry) and an edge-sharing bioctahedron containing two bridging ligands (D{sub 2h} symmetry). The latter geometry, which is that of U{sub 2}(O-i-Pr){sub 10}, was also examined at U-U bonding and nonbonding distances. The calculations indicate that themore » U-U interactions are significantly perturbed when H is replaced by OH, owing to strong donation from the OH p{pi} orbitals into selected U 5f orbitals. The result is a lack of any appreciable U-U interaction for U{sub 2}(OH){sub 10} in either the D{sub 4h} or D{sub 2h} geometry. In addition, the overall OH {pi} donation to the U 5f levels is enhanced in the D{sub 2h} geometry. The electronic structure of a hypothetical U(V) dimer, Cp{sub 2}U{sub 2}O{sub 4}, was also examined in both bridged and unsupported geometries. The unbridged geometry, like that for U{sub 2}(OH){sub 10}, suffered from a destabilization of the U-U {sigma} orbital due to ligand {pi} donation and revealed no net U-U bonding. However, the geometry exhibiting two bridging oxo ligands maintains the U-U {sigma}-bonding MO as its lowest energy U 5f orbital. 21 refs., 8 figs., 8 tabs.« less
  • No abstract prepared.
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