Abstract
1. 1. Endogenous respiration of unembryonated Ascaris egg homogenates proceeded in the absence of demonstrable cytochrome- c oxidase activity. Respiration was cyanide- and azide-sensitive although the rate of cytochrome- c reduction was unaffected by these inhibitors. 2. 2. Gastrula egg preparations contained cytochrome oxidase activity but endogenous cytochrome- c reduction greatly exceeded oxidation. 3. 3. Embryonated egg homogenates contained cytochrome- c oxidase activity, and the rate of endogenous cytochrome- c reduction and oxidation resulted in a steady state of partially oxidized cytochrome- c. While cytochrome- c oxidase activity was inhibited by carbon monoxide, respiration was unaffected. 4. 4. The oxygen uptake-pO 2 relationship was different with unembryonated and embryonated egg homogenates. The results support the proposition of a flavin-mediated terminal oxidase in unembryonated eggs as contrasted with cytochrome- c oxidase in embryonated eggs.
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