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Title: The Biological bulletin
Identifier: biologicalbullet105mari (find matches)
Year: [1] (s)
Authors: Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983
Subjects: Biology; Zoology; Biology; Marine Biology
Publisher: Woods Hole, Mass. : Marine Biological Laboratory
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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66 C. M. CHILD the differential in the thin layer, if present, is not sufficient to be clearly .visible, except in an apical thickening, as in Figure I, B. In many individuals the cell-wall gradient still seems to be barely visible but it is not consistently distinguishable in all as de- velopment progresses. In general, the cell-wall gradient is most clearly visible in early stages of the indophenol reaction and dye oxidation. As intracellular con- centration of indophenol or dye increases, it becomes progressively less distinct, and finally almost or quite indistinguishable. Figure 1, C is a Dendraster exogastrula from a lot subjected to rather extreme change from low to high temperature. This and several other lots were kept after
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J K L FIGURE 1. Oxidation patterns of Dendraster excentricus: A, normal blastula; B, normal early gastrula; C-I, LiCl exogastrulae; J-L, sodium azide pre-exogastrulae and early exo- gastrulae. For data concerning experimental conditions see the text.

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7 August 2015
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