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Irradiation of Sperm Tails by Laser Microbeam

Goldstein, Stuart F. (1969) Irradiation of Sperm Tails by Laser Microbeam. Journal of Experimental Biology, 51 (2). pp. 431-441. ISSN 0022-0949.

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1. Sea-urchin and starfish sperm tails were irradiated at pre-selected points along the flagellum and at pre-selected phases of the beat cycle by means of a pulsed ruby laser microbeam. Multiple-exposure dark-field photomicrographs were taken immediately before and after irradiation. The flagellum usually appeared to be broken at the irradiated point. 2. The portion of a flagellum between the head and the irradiated point continued for at least a few beats if its length was at least 25% of the length of the tail, and stopped immediately if it was shorter. 3. Bends already established beyond the irradiated point continued to propagate to the tip of the flagellum. Their propagation velocity generally decreased, and there were usually changes in other bend parameters. 4. No new bends ever developed beyond the irradiated point. 5. Irradiation within a bent region often completely eliminated that region.

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Additional Information:© 1969 The Company of Biologists Ltd. Received 10 February 1969. This paper has been abstracted from part of a Ph.D. thesis presented to the California Institute of Technology. I am indebted to Professor C. J. Brokaw for guidance during the course of these experiments, and for generous criticism of the first draft of this paper. This work was supported by U.S. Public Health Service Training Grant 5 TI GM 86 and U.S. Public Health Service Grants GM 6965 and GM 14613.
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Public Health Service Training Grant5 TI GM 86
Public Health Service GrantGM 6965
Public Health Service GrantGM 14613
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33858
Deposited By: Tony Diaz
Deposited On:05 Sep 2012 18:17
Last Modified:03 Oct 2019 04:13

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