Abstract
Steady-state concentrations of citric acid cycle compounds accumulating during state 3 oxidation of pyruvate by guinea pig heart mitochondria have been measured using isotopic and fluorometric techniques; incubations partially inhibited with several guanidine derivatives and other inhibitors were compared with controls. The changes in levels of intermediates which occurred with guanidine derivatives were quantitatively and qualitatively identical to those with amytal; this pattern of intermediates was therefore not limited to those compounds which possess hypoglycemic propertiesin vitro. With antimycin, rotenone and nigericin the pattern of intermediates was specific for each agent, and differed from that with guanidine derivatives and amytal.
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