The effect of cupric and fluoride ions on the respiration of Chlorella

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Abstract
The respiration rate of endogenously respiring Chlorella pyrenoidosa is not decreased by 4.10−2 M fluoride or 8.10−3 M cupric ions, but when both agents are added simultaneously oxygen uptake stops immediately. Parallel experiments with glucose-stimulated cells lead us to conclude that copper alone does not inhibit a dissimilation pathway distinct from glycolysis, as has previously been suggested. We propose an explanation of the decreased inhibition found when F− is added before Cu2+, based on our finding that the inhibition of glycolysis by F− decreases with time.

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