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Journal of Experimental Biology 57,575-587 (1972)
Published by Company of Biologists 1972

Tension at the Surface of the Dividing Sea-Urchin Egg

MITSUKI YONEDA 1 and KATSUMA DAN 2

1 Department of Biology, Tokyo Metropolitan University Setagaya, Tokyo, Japan; Department of Biology, Ochanomizu University, Otsuka, Tokyo. Japan
2 Department of Biology, Tokyo Metropolitan University Setagaya, Tokyo, Japan

1. Cyclic changes in tension correlating with the division cycle were demonstrated by compression method of Cole.

2. A sharp peak in the tension was found 8 min before the onset of cleavage at 13°C

3. A computer method indicated that the tension reached a maximum at the start of cleavage, after which it steadily decreased throughout the course of cleavage.

4. A rough estimation revealed that the force of constriction at the equatorial ring amounted to 6 x 10-3 dyne, which compares well with Rappaport's result (1967).

Submitted on March 13, 1972




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© The Company of Biologists Ltd 1972