Due to the ultraslow ligand exchange rate on Pt, non-thiolated DNA is adsorbed on platinum nanoparticles (PtNPs) more stably than thiolated and even dithiolated DNA on AuNPs. Adsorption kinetics, capacity and stability are systematically compared as a function of DNA sequence. The Pt conjugates can tolerate extreme pH, salt, and thiol molecules. Taking advantage of the optical properties of AuN...

Redox regulation of chloroplast enzymes via disulphide reduction is believed to control the rates of CO2 fixation. The study of the thioredoxin reduction pathways and of various target enzymes lead to the following guidelines.

T. S. Rosenstock ([email protected]) and P. H. Brown, Dept of Plant Sciences, Univ. of California, Davis, Davis, CA 95616, USA. Present address for TSR: Agricultural Sustainability Inst., Univ. of California, Davis, Davis, CA 95616, USA. – A. Hastings and D. J. Lyles, Dept of Environmental Science and Policy, Univ. of California, Davis, Davis, CA 95616, USA. – W. D. Koenig, Lab of Ornitho...

The asymmetric unit of the title compound, C(9)H(4)S(7), contains two independent mol-ecules, in one of which the central five-membered ring is disordered over two orientations in a 0.924 (3):0.076 (3) ratio. The mol-ecular skeleton is almost planar: the average distance of the atoms from their mean plane is 0.128 (7) Å in the ordered mol-ecule, and 0.088 (5) and 0.123 (2) Å in the major and mi...

Based on the sensitivities of material properties to temperature and the complexity of service environment of thermal protection system on the spacecraft, ultrahigh-temperature ceramics (UHTCs), which are used as thermal protection materials, cannot simply consider thermal shock resistance (TSR) of the material its own but need to take the external constraint conditions and the thermal environm...

Complexes of the type ZnS6(TMEDA), ZnS4(PMDETA), and ZnS4(Me3TACN) react with electrophilic alkenes to give dithiolene complexes ZnS2C2R2(amine)n. The Me3TACN complex is the most reactive, while the more conveniently prepared PMDETA complex also undergoes this reaction at useful rates. The following alkenes were successfully tested: C2H2(CO2Me)2 (cis and trans isomers), C2H3(CO2Me), C2H3(CN), 1...

A new assay for 3-hydroxy-3-methylglutaryl CoA reductase (mevalonate: NADP oxidoreductase [acylating CoA] , EC 1.1.1.34) is based upon the measurement of released coenzyme A (SH) during the reduction of 3-hydroxy-3-methylglutaryl CoA to mevalonate. Coenzyme A was measured in the presence of dithiothreitol, required for activity, by reaction with 5,5’-dithiobis(2-nitrobenzoic acid). Sodium arsen...