Abstract
Oxidation of external NADH (NADH is an impermeant substrate) by cells of Tetrahymena pyriformis oscillated with a period of 24–26 min. The period length in darkness (25.6 min) appeared to be slightly longer than the period in light (∼24 min). When Tetrahymena were placed in darkness for 30–50 min and then returned to light, a new maximum in the rate of NADH oxidation was observed 36–38 min (13 + 24) min after the beginning of the light treatment. The cell-surface NADH oxidase of human buffy coats (a mixture of white cells and platelets) also was periodic and light responsive.
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