. 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. 9. Hatched Ttibifex worms, a, control; h, c, after treatment with 1 X 10-2 ]Vf sodium azide (Palazzo, 1955). is, the mesodermic cell. Palazzo (1955) partially blocked the CO. with sodium azide in the first stages of development. She obtained worms with relevant de
. 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. 9. Hatched Ttibifex worms, a, control; h, c, after treatment with 1 X 10-2 ]Vf sodium azide (Palazzo, 1955). is, the mesodermic cell. Palazzo (1955) partially blocked the CO. with sodium azide in the first stages of development. She obtained worms with relevant deficiencies in the muscular system and in the circulatory system, both of which are mesodermic derivates (Fig. 9). In the eggs of Bithynia (Attardo, 1955a) and Physa (Mancuso, 1955a), however, the CO. appears localized in the ectodermic blastomeres. Now the blocking of the enzyme by sodium azide (Figs. 10 and 11) produces animals which are abnormal for the ectodermic derivates, , the brain, the eyes, and the tentacles (Attardo, 1955b; Mancuso, 1955b). Another example of relations between the enzymes and mor- phogenesis is offered by the Physa egg. Mancuso (1955a) showed. 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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