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Biol Bull 75: 238-247. (October 1938)
© 1938 Marine Biological Laboratory
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THE EFFECTS OF ULTRA-VIOLET RADIATIONS OF VARIOUS WAVE-LENGTHS UPON CLEAVAGE OF SEA URCHIN EGGS

ARTHUR C. GIESE 1

1 SCHOOL OF BIOLoGICAL SCIENCES, STANFORD UNIVERSITY

1. The effects of a series of dosages of known intensities of monochromatic quartz ultra-violet light upon fertilized eggs of the sea urchin Strongylocentrotus purpuratus were studied.

2. Even at the highest dosages of ggr3660A used the eggs cleaved at just about the natural rate of controls; ggr3130A produced more pronounced retardation of cleavage; ggr2537, ggr2654 and ggr3025A were about equally effective, and ggr2804A most effective of all.

3. No signs of definite and marked acceleration were observed at any of the wave-lengths for any of the dosages employed.

4. The destructive effect may be mediated by some substance most sensitive to ggr2804A.






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Copyright © 1938 by the Marine Biological Laboratory.