The Journal of General Physiology
Avanti Polar Lipids
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The Journal of General Physiology, Vol 37, 313-324, Copyright © 1954 by The Rockefeller University Press

ARTICLE

A COMPARISON OF FIVE EFFECTS OF ULTRAVIOLET LIGHT ON THE ARBACIA EGG

Harold F. Blum 1, John S. Cook 1, and Gordon M. Loos 1

1 From the National Cancer Institute, National Institutes of Health, Public Health Service, Department of Health, Education, and Welfare, Bethesda; the Department of Biology, Princeton University, Princeton; and the Marine Biological Laboratory, Woods Hole

The demonstration of five different effects of ultraviolet radiation on the sea urchin's egg indicates that more than one basic photochemical process goes on there. Photorecovery is observed in only one of these. The need for caution in interpreting such effects is obvious.

Evidence for a different mechanism for the timing of cleavage in eggs activated by ultraviolet radiation as compared to normally fertilized eggs is presented.

The bearing of these studies on survival curves for microorganisms is discussed.

Submitted on June 23, 1953


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