The cation Hgz2+ may be regarded as the simplest binuclear complex that contains a metal-metal single bond. This bond consists of an electron pair in a ubonding MO which is formed by the interaction of the 6s orbitals of both mercury ions [ 11. While in numerous studies it has been shown that metal-metal single bonds of binuclear transition metal complexes can be split homolytically by uu* exci...

Dilute mixtures of hexanal in synthetic air (up to 100 ppm) were photolyzed with fluorescent UV lamps (275-380 nm) in air at 298 K. The main photooxidation products, identified and quantitatively analyzed by FTIR spectroscopy, were butene, CO, vinylalcohol and ethanal. The photolysis rates and the absolute quantum yield Φ were found to be slightly dependent on the total pressure. At 100 Torr, Φ...

 S 185 I.  186 II.          186 1. Superoxide-generating NADPH oxidase 186 2. Zinc deficiency potentiates iron-mediated free radical production 189 (a) Iron accumulation in zinc-deficient plants 189 (b) Iron-induced production of free radicals 189 3. Zinc deficiency-enhanced photooxidation 191 (a) Decrease in photosynthesi...

In a first part, visible and UV light-induced photooxidation of the main lipid cell components (chlorophylls, carotenoids, sterols, unsaturated fatty acids, highly branched isoprenoid and linear alkenes, alkenones, cuticular waxes ...) in senescent phototrophic organisms (phytoplankton, cyanobacteria, higher plants, purple sulfur bacteria and aerobic anoxygenic phototrophic bacteria) is examine...

The uncoupler desaspidin is labile in the presence of oxidants at alkaline pH values. It also undergoes chlorophyll-sensitized photooxidation at a more acid pH. The products of the oxidation appear to have negligible activity in inhibiting electron transfer and photophosphorylation.Failure of desaspidin to uncouple in the presence of oxidants used as cofactors of noncyclic electron flow is pres...