Abstract
The rates of oxidation and phosphorylation in isolated rat-liver mitochondria have a steep dependence on the protonmotive force (Δ≈sm h ) across the membrane. These experimentally observed relationships proved to be independent of the way in which δ≈gm h was varied. These results were obtained when the membrane potential (ΔΨ) was calculated from the distribution of K + (in the presence of valinomycin). When triphenyl-methylphosphonium (TPMP +) was used as a probe for ΔΨ, slightly different flow-force relationships were obtained. We conclude that unique relationships exist between Δ≈sm h + and the rates of oxidation and phosphorylation, and that under some conditions the behaviour of the probe TPMP + is anomalous.
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