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Science 2 June 1967:
Vol. 156. no. 3779, pp. 1241 - 1243
DOI: 10.1126/science.156.3779.1241
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Articles

Cell Division: Direct Measurement of Maximum Tension Exerted by Furrow of Echinoderm Eggs

R. Rappaport 1

1 Department of Biological Sciences, Union College, Schenectady, New York

Tensions exerted by cleavage furrows in isometric contraction were measured by means of flexible glass needles whose characteristics of bending had already been determined. The tension of Astriclypeus manni furrows in second division is 3.04 x 10-3 ± 0.95 x 10-3 dyne; that for Pseudocentrotus depressus eggs in first division is 2.00 X 10-3 ± 0.43 x 10-3 dyne. The tension required for cleavage probably does not exceed 1.5 x 10-3 dyne. According to existing morphological evidence, these values can be accounted for by a substance whose capacity for exerting tension does not exceed that of an actomyosin thread.


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Rappaport Furrows on Our Minds: The ASCB Cytokinesis Meeting Burlington, VT July 22-25, 2004.
J. C. Canman and W. A. Wells (2004)
J. Cell Biol. 166, 943-948
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Cleavage furrow: timing of emergence of contractile ring actin filaments and establishment of the contractile ring by filament bundling in sea urchin eggs.
I. Mabuchi (1994)
J. Cell Sci. 107, 1853-1862
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Science. ISSN 0036-8075 (print), 1095-9203 (online)