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VICTOR A. NADTOCHENKO ANTON I. LAVRENTYEV IGOR V. RUBTSOV NIKOLAI N. DENISOV YANINA V. BARANNIKOVA VITALY V. NIKANDROV ALEXANDR. A. KRASNOVSKY 《Photochemistry and photobiology》1991,53(2):261-269
Abstract— An unexpected transmembrane potential effect on the recombination rate of the pheophytin or bacteriopheophytin anion-radicals (dissolved in membrane) and ascorbic ion-radicals (dissolved in aqueous interior) has been established in liposomes. The influence of transmembrane potential on the recombination rate of Ru3+ (dissolved in inner volume) and (C18 H37 )V+ or (C14 H29 )V+ (dissolved in membrane) was observed. The potential was created by a potassium concentration gradient between inner and outer volumes of liposomes in the presence of valinomycin. The effect of the potential was considered on the bases of: (1) it was determined by the diffusional drift of the hydrophobic radicals in a radial direction in the membrane, according to the direction of the electric field; (2) the electric field changed the rate constant of the electron transfer, owing to the effects on the free energy and electronic coupling. Our results show the first explanation to be preferable. 相似文献
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MARTIN PLATO HEINZ-JÜRGEN STEINHOFF CHRISTOPH WEGENER JENS T. TÖRRING ANTON SAVITSKY KLAUS MÖBIUS 《Molecular physics》2013,111(23):3711-3721
Semiempirical molecular orbital methods (PM3, INDO, ZINDO/S) have been used to calculate the effects of local electric fields and of hydrogen bonding on the g and hyperfine tensors of a nitroxide spin label model system. The results yield a linear correlation between the two principal tensor components g xx and A N zz at label sites of varying polarity. Hydrogen bonding with a single water molecule produces a constant shift of Δg xx ? ?4 × 10?4. These theoretical results are used to interpret recent high field (3.4 T, 95 GHz) electron paramagnetic resonance investigations on site-directed spin labelled bacteriorhodopsin. This protein reveals a close correlation between proticity and polarity at the various label sites. The slope of the g xx versus A N zz dependence is affected strongly by polarity induced structural strains of the spin label. 相似文献
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Zuleyka MENDEZ Raquel E. ANTON Jean-Louis SALAGER 《Journal of Dispersion Science and Technology》2013,34(3):883-892
Surfactant-oil-water systems in which the surface active substance is a mixture of carboxylic acid and its sodium salt (soap), exhibit emulsion property maps that are consistent with the phase behavior and the general emulsion phenomenology. However they present specific features such as an extended C+ multiple emulsion region and a skinked A+ W/O emulsion zone. In this case the aqueous phase pH drives the relative hydrophilicity of the acid/salt mixture at interface and plays the role of the most sensitive formulation variable. Studied systems contain C10 to C14 carboxylic acid, NaCl brine and a light distillation cut, as well as alcohols. 相似文献
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