. 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. EARLY DETERMINATION IN DEVELOPMENT UNDER NORMAL AND EXPERIMENTAL CONDITIONS SILVIO RANZI: zoological department, THE UNIVERSITY OF MILAN, ITALY Development Alterations and How They Are Obtained Working on sea urchin embryos, Runnstrom (1954) and his group showed that t
. 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. EARLY DETERMINATION IN DEVELOPMENT UNDER NORMAL AND EXPERIMENTAL CONDITIONS SILVIO RANZI: zoological department, THE UNIVERSITY OF MILAN, ITALY Development Alterations and How They Are Obtained Working on sea urchin embryos, Runnstrom (1954) and his group showed that there are certain substances such as LiCl that inhibit organ development at the animal half of the embryo by. Fig. 1938.) 1. Vegetalized sea urchin embryos. (From Lindahl and Ohman, inducing a developmental increase in the organs formed at the vegetal half (vegetalized larvae) (Fig. 1). On the other hand, other substances such as iodosobenzoate and NaSCN inhibit the organs formed at the vegetal half and favor the development of rudiments which appear at the animal half (animalized larvae) (Fig. 2). The morphology of the two above mentioned larvae was analyzed by Runnstrom (1928), Lindahl (1936), and Gustafson 291. 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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