ADDITIONAL EVIDENCE OF QUALITATIVE DIFFERENCES BETWEEN THE RESTING AND ACTIVITY OXYGEN CONSUMPTIONS OF FROG MUSCLE

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Abstract
The activity respiration of frog muscle is inhibited by suitable concs. of fluoride, arsenite, hydroxylamine, diethyl dithiocarbamate, and K ethyl xanthate without decreasing the resting respiration appreciably. Pyrophosphate and thiourea do not affect significantly either fraction of the respiration. The resting and activity O2 consumptions apparently differ with respect to the dehydrogenase systems utilized as well as with respect to the participation of cytochrome oxidase. In addition the presence of inhibition by diethyl dithiocarbamate and potassium ethyl xanthate admits the possibility that a Cu-bearing enzyme may take part in the activity respiration of frog muscle.

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