. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 1. Diagrammatic representation of the gradient systems in the sea-urchin egg. The mode of action of lithium has been assumed by Spek (1918) to be a precipitating and swelling effect on the surface of the vegetative cells. This, according to Spek, would account for the " exogastrula- tion " which is one of the most characteristic effects of treatment with stronger concentrations of lithium. Runnstrom believes, on the other hand, that such a surface effect is secondary to a more important in- ternal effect and h
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 1. Diagrammatic representation of the gradient systems in the sea-urchin egg. The mode of action of lithium has been assumed by Spek (1918) to be a precipitating and swelling effect on the surface of the vegetative cells. This, according to Spek, would account for the " exogastrula- tion " which is one of the most characteristic effects of treatment with stronger concentrations of lithium. Runnstrom believes, on the other hand, that such a surface effect is secondary to a more important in- ternal effect and he has experimental evidence to show that lithium penetrates the cells. With dark ground illumination the internal struc- ture of the cells of the " lithium " larva has a coarsened appearance. He assumes that some action of the lithium which is related to this- structural change has an effect on the determination and differentiation of the animal pole greater than on the vegetative pole. Runnstrom (1933) found that lithium, in concentrations which in themselves are too low to affect development, can be made very active if the eggs, during exposure, are kept in an atmosphere of carbon monoxide containing 5 per cent oxygen. This effect of carbon monox- ide is abolished in strong light. The same, as is well known, holds true. 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
Size: 1436px × 1740px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
