Abstract

The utilization of endogenous phospholipids has been observed during the aerobic incubation of spermatozoa of the freshwater mussel, Hyriopsis schlegelii. The theoretical oxygen uptake of the spermatozoa, which was calculated from the disappearence of phospholipids during aerobic incubation, almost corresponded to actual oxygen uptake. Although the spermatozoa contain a considerable amount of carbohydrate in the cell, the consumption of carbohydrate was found to be insufficient to account for the observed oxygen uptake. The respiratory quotient of the spermatozoa also indicated the predominance of lipid metabolism.

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