Abstract
In conditions where the pH gradient is negligible, the rate of the pyridine nucleotide transhydrogenase in chromatophores of Rhodobacter capsulatus has a threshold dependence on membrane potential. The relationship is similar when either antimycin or myxothiazal or carbonyl cyanide p-trifluoromethoxyphenylhydrazone is used to depress the membrane potential. The relationship is distorted when membrane potential is reduced by lowering the photosynthetic light intensity.
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