. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 10 ii is no elevation of a fertilization membrane from the egg surface, and the blastomeres frequently become entirely separated after cleavage. Eggs placed in KCN w/ioo fifteen minutes after fertilization and washed and returned to sea water after three hours also showed cleavage of this kind in 30-40 per cent. In the other eggs of these lots cleavage is normal or incomplete and often irregular or else delayed with simultaneous formation of a number of blastomeres. Apparently then these one-sided cleav- ages represent the f
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 10 ii is no elevation of a fertilization membrane from the egg surface, and the blastomeres frequently become entirely separated after cleavage. Eggs placed in KCN w/ioo fifteen minutes after fertilization and washed and returned to sea water after three hours also showed cleavage of this kind in 30-40 per cent. In the other eggs of these lots cleavage is normal or incomplete and often irregular or else delayed with simultaneous formation of a number of blastomeres. Apparently then these one-sided cleav- ages represent the first step in departure from normal cleavage. The indirect evidence shows that a susceptibility gradient is present in these stages of development and that the region of highest susceptibility and therefore of highest metabolic rate is the apical pole. It is evident that cyanide inhibits cleavage, and if the apical pole is most susceptible, we should expect to find cleavage most completely inhibited there, and least inhibited at the basal pole. It is probable, therefore, that these cleavage furrows start from the basal and proceed toward the apical pole,. 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 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. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
