Abstract
Rode, L. J. (The University of Texas, Austin), and J. W. Foster. Quantitative aspects of exchangeable calcium in spores of Bacillus megaterium. J. Bacteriol. 91:1589–1593. 1966.—More than 90% of the calcium in Ca45-labeled native spores was released from the cells during germination. Some 95% of the spore calcium was not exchangeable when ungerminated native spores were titrated to pH 4 with HNO3. Ca, Mg, Na, Si, and Fe were displaced from the spores by H+. The adsorption of Ca45 by H-spores and its subsequent release were studied under a variety of conditions. The isolated “coat fraction” of spores adsorbed substantial amounts of Ca45. Release of the adsorbed Ca was achieved with various reagents.
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