X-Ray Survival Studies on the Alga Brachiomonas submarina Bohlin

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Abstract
B. submarina reproduces asexually by undergoing 2-3 (occasionally 4) successive divisions, followed by release of the new cells from the mother-cell wall. On a regimen of alternating light and dark periods, divisions and release were confined to the dark period, so that population increase was partially synchronized. On a regimen of continuous illumination, divisions occurred at random, and population growth was exponential. Cultures grown under continuous illumination had an X-ray survival curve with a relatively high threshold; the LD37 was approximately 5 kr. The survival curve of light-cycled cultures irradiated during the light period had the same slope but a lower threshold; the LD37 was approximately 3 kr. The culture medium employed and the intensity of illumination did not influence survival.

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