Abstract
When yeast cells were exposed to 20,000 r of X-rays and cultured in liquid medium, they and their descendants attained a mean cell volume more than twice that of cells derived from non-irradiated controls. There were no corresponding differences in specific gravity and N content per unit of cell volume. Evidently the enlargement of yeast cells after irradiation is largely a nonselective increase in cell constituents rather than a swelling due mostly to uptake of water.

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