JMDMT #119 Microfossils of Cyanobacteria in Carbonaceous Meteorites
BackThe James M. DuPont Meteorite Collection - to withstand the molarity variations gives advantages to these brackish water species. Because the variation of osmotic pressure mainly affects the protoplasm of the brackish water organisms, it was clear that protoplasmic differences must exist, and that these differences could only be discovered by studying the living cells. After the classical studies of de Vries (1871, 1885), one could assume, as a matter of course, that an increase in osmotic pressure would cause plasmolysis, and also that plasmolysis could be neutralized by permeance to, or active uptake of, the plasmolyzing substances. Hofler showed (1918, and more accurate concept 1931) that de Vries's concept of semipermeability was untenable. 368 Annals New York Academy
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Uploaded: November 21st, 2008 @ 12:07 am
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