QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by NELSON, C. Articles by BROOKS, S. C. Search for Related Content PubMed Articles by NELSON, C. Articles by BROOKS, S. C.

Journal of Experimental Biology 12,212-216 (1935)
Published by Company of Biologists 1935

Effects of Infra-red Light on Subsequent Cleavage of the eggs of Urechis caupo

CLARENCE NELSON ¹ and S. C. BROOKS ¹

¹ Department of Zoology, University of California

1. Eggs of Urechis caupo were exposed to infra-red light of wave-lengths from 0·7 to 2·0µ.

2. Upon subsequent insemination the rate of cleavage and sometimes also the proportion of the eggs forming fertilisation membranes was reduced.

3. This effect gradually disappeared after irradiation, especially during the time preceding insemination. This has been interpreted as due either to recovery from the effects of the irradiation or to a more lasting retardation of normal ageing processes in the eggs.

4. The photochemical nature of these effects is pointed out and discussed.