. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. Fig. 21. Reacted spermatozoa of Asterina pectinifera showing acrosome filaments after suspension in egg water. (From Dan, Biol. Bull., 1954.) a, small cluster of agglutinated spermatozoa; b, single reacted spermatozoon. than in the unreacted spermatozoon (Fig. 22B), an
. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. Fig. 21. Reacted spermatozoa of Asterina pectinifera showing acrosome filaments after suspension in egg water. (From Dan, Biol. Bull., 1954.) a, small cluster of agglutinated spermatozoa; b, single reacted spermatozoon. than in the unreacted spermatozoon (Fig. 22B), and the base of the flagelknn and the acrosome filament lay nearly at right angles to each other. Molluscs. In some of the species of bivalve mollusc studied by Dan and Wada (1955), the acrosome reaction was elicited by the species egg water and/or by "contact" with glass surfaces. However, in all the species studied, the spermatozoa produced acrosome filaments when placed in the presence of unfertilized. Fig. 22. Head ends of spermatozoa of starfish. (After Dan, Biol. Bull., 1954.) A, reacted, showing the acrosome filament; B, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Association for the Advancement of Science. Section on Zoological Sciences; Tyler, Albert, 1906-. Washington
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Keywords: ., bookcentury1900, bookpublisherwashington, booksubjectembryology
