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Biol Bull 85: 193-200. (December 1943)
© 1943 Marine Biological Laboratory
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THE RADIOSENSITIVITY OF EGGS OF ARBACIA PUNCTULATA IN VARIOUS SALT SOLUTIONS

KARL M. WILBUR 1 and RICHARD O. RECKNAGEL 1

1 The Marine Biological Laboratory, Woods Hole; Department of Zoology and Entomology, The Ohio State University; and the Zoological Laboratory, University of Pennsylvania

1. Treatment of Arbacia eggs with 0.35 M potassium citrate inhibited the retarding action of x-radiation on cell division. However, the inhibition by citrate was slight and appeared mainly with high x-ray doses (30,400 and 53,200 r).

2. The radiosensitivity of the egg was unaffected by increasing the calcium or magnesium content of the sea-water medium.

3. The potassium citrate treatment employed increased the viscosity of the unfertilized egg. The viscosity was decreased slightly in the sea-water solutions of increased calcium or magnesium content.

The data presented indicate that changes in the ionic composition and viscosity of the protoplasm may occur without altering the sensitivity of the egg to x-radiation.

4. Doses of x-radiation which markedly altered the rate and normal course of cell division produced no detectable change in the viscosity of the unfertilized egg.






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Copyright © 1943 by the Marine Biological Laboratory.