. 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. 310 EARLY DETERMINATION IN DEVELOPMENT viscosity of proteins diluted in IM KCl being 100. The values show that the proteins from embryos treated with LiCl are much more resistant to the action of urea and to proteolytic enzymes such as trypsin and papain than are contr
. 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. 310 EARLY DETERMINATION IN DEVELOPMENT viscosity of proteins diluted in IM KCl being 100. The values show that the proteins from embryos treated with LiCl are much more resistant to the action of urea and to proteolytic enzymes such as trypsin and papain than are control proteins; the proteins of embryos treated with NaSCN are less resistant to urea and proteolytic enzymes. Another experiment was performed with these materials. The A NdSCN Control. Fig. 16. The optical densities (at 275 millimicrons) of the solutions of Fig. 15 are assumed to be 100. After the readings, the proteins were precip- itated with trichloracetic acid. The optical density after precipitation is plotted on the ordinates. (From Ranzi, 1955.) solutions used for the viscosimetric test mentioned above were precipitated by diluting 1:1 with 10% trichloracetic acid. The optical density of the supernatant fluid was read at 275 milli- microns in the Beckman spectrophotometer (Fig. 16). The data show that, in the protein solutions of embryos treated with NaSCN, a greater quantity of material remains in solution than in the controls. In the solutions of embryos treated with LiCl a. 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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