Abstract
1. Ciliates and cysts of Colpoda steinii are rich in phospholipase activity and this interferes with the assay of the phospholipid-dependent parts of the electron-transport chain. 2. Succinate: phenazine methosulphate oxidoreductase decreases by about 30% when cells encyst indicating no major degradation of mitochondria. 3. This is supported by the speed with which cell respiration is restored on addition of hay infusion to cysts and by electron microscope studies already published.
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