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Biol Bull 103: 139-144. (August 1952)
© 1952 Marine Biological Laboratory
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THE PROTOPLASMIC CORTEX IN RELATION TO STIMULATION

W. L. WILSON 1 and L. V. HEILBRUNN 1

1 Dept. of Physiology and Biophysics, College of Medicine, University of Vermont, Burlington, Vermont, and Dept. of Zoology, University of Pennsylvania, Philadelphia 4, Pa.

1. The cortex of the Chaetopterus egg is made more rigid by excess calcium; it tends to lose its rigidity when exposed to oxalate solutions or to potassium ions.

2. The cortex of the Chaetopterus egg is also liquefied by acid, alkali, fat solvents, heat, cold, ultraviolet radiation and hypertonic solutions.

3. In general, the behavior of the Chaetopterus egg cortex is very like that of the cortex of ameba.

4. All agents which have been found to stimulate the Chaetopterus egg to divide cause a liquefaction of the cortex.

5. The results of this investigation lend additional support to the colloid chemical theory of stimulation.






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