. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Vol. LXXVII, No. 2 October, 1939 THE BIOLOGICAL BULLETIN PUBLISHED BY THE MARINE BIOLOGICAL LABORATORY ACTIVITY-PREVENTING AND EGG-SEA-WATER NEUTRALIZING SUBSTANCES FROM SPERMATOZOA OF ECHINOMETRA SUBANGULARIS WALTER E. SOUTHWICK (From the Bermuda Biological Station for Research l) INTRODUCTION A spermatozoon, like all highly specialized biological units, has many utterly unique, but very significant characteristics. Of these, probably the most fundamental is the finiteness of its period of life. As has been clearly demonstr
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Vol. LXXVII, No. 2 October, 1939 THE BIOLOGICAL BULLETIN PUBLISHED BY THE MARINE BIOLOGICAL LABORATORY ACTIVITY-PREVENTING AND EGG-SEA-WATER NEUTRALIZING SUBSTANCES FROM SPERMATOZOA OF ECHINOMETRA SUBANGULARIS WALTER E. SOUTHWICK (From the Bermuda Biological Station for Research l) INTRODUCTION A spermatozoon, like all highly specialized biological units, has many utterly unique, but very significant characteristics. Of these, probably the most fundamental is the finiteness of its period of life. As has been clearly demonstrated by Lillie (1919), Gray (1928) and others, mature spermatozoa, except possibly those of certain arthro- pods, are unlike all other biological units in that they do not at any time ingest or otherwise assimilate substances from which energy may be derived. Once, therefore, that a spermatozoon has been liberated from the testis, its every power and activity must be accomplished on the basis of substances that were located in its structure at the time of its liberation. Studies to determine what different substances might be located in a spermatozoon, the location, nature, and ap- proximate amounts of such substances, the changes in location and state which they might undergo, and the factors which might in- fluence, affect, or effect such processes are, therefore, especially important for an understanding of spermatozoan physiology. A series of studies which were made at the Bermuda Biological Station for Research have provided some observations concerning such substances. MATERIALS AND PROCEDURES The studies were made with the common reef urchin, Echinometra subangularis, individuals of which were obtained from the reefs on the eastern end of St. David's Island. The trip to the reefs was made by bicycle, and the urchins were brought to the laboratory in a pail with a small volume of water and covered with seaweed. The water 1 Laboratory space for this investigation was provi
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
