Tension at the Surface of the Dividing Sea-Urchin Egg

Open Access
Publisher Website
Google Scholar
Abstract
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).