INHIBITION OF RESPIRATION IN SEA URCHIN SPERMATOZOA FOLLOWIGN INTERACTION WITH FIXED UNFERTILIZED EGGS. III. INHIBITION OF SPERM RESPIRATION BY HEAT STABLE SUBSTANCE REMOVED FROM GLUTARALDEHYDE-FIXED EGGS

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Abstract
The respiratory rate of spermatozoa of the sea urchin, Pseudocentrotus depressus and Hemicentrotus pulcherrimus, became quite low and spermatozoa was immotile after sperm suspension containing glutaraldehyde-fixed eggs of homologous species was stirred at 20.degree. C for 15 min. The respiratory rate of fresh spermatozoa introduced to the suspension of immotile spermatozoa thus obtained, also was reduced markedly. The respiration of fresh spermatozoa was not inhibited by adding them to suspension of intact or acrosome reacted spermatozoa. A heat stable and non-dialyzable substance, which inhibited sperm respiration, was removed from the fixed eggs by vigorously stirring the egg suspension for 10 min, when unfertilize eggs were fixed with an insufficient amount of glutaraldehyde (10 ml of 1% glutaraldehyde solution to 1 ml egg pellet).
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