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Science 24 February 1984:
Vol. 223. no. 4638, pp. 830 - 833
DOI: 10.1126/science.6695186
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Articles

Science, Vol 223, Issue 4638, 830-833
Copyright © 1984 by American Association for the Advancement of Science

articles

An ultrahigh-speed analysis of exocytosis: nematocyst discharge

T Holstein and P Tardent

High-speed microcinematography of nematocyst discharge in Hydra attenuata Pall. shows that this specialized exocytosis, which appears to result from an increase in the intracapsular pressure, requires a total of about 3 milliseconds. A maximum velocity of 2 meters per second is generated, corresponding to an acceleration of 40,000g. Thus nematocyst discharge is one of the fastest cellular processes in nature.


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