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By Milton R. J. Salton (auth.), Lionel A. Manson (eds.)

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The major molecular species believed to form an integral part of the membrane structure are, therefore, proteins and lipids. B. Lipids and Lipid-Soluble Components Apart from the ,B-OH butyrate polymer which occurs in the form of granules in the cytoplasm, the lipids or "lipid-soluble" substances of the bacterial cell are almost exclusively localized in the membrane systems. Fat droplets or globules of free lipids have not been reported in bacterial cells, but they apparently occur in fungi and higher protists.

1966). , The tubulovesicular membranes would form a continuous intracellular network, the connections being sheared apart during mechanical disruption. Isolated chromatophores have a gross chemical composition not very dissimilar to that of membranes or envelope fractions of Gram-negative bacteria (Newton and Newton, 1957; Lascelles, 1962). 4-61 %. Antisera to isolated chromatophores agglutinated cells of R. rubrum (Newton, 1958), and such a result could be explained by contamination with envelope fragments as suggested by Holt and Marr (1965).

The cells are about 1 p. in diameter. 22 Milton R. J. Salton Figure 10: (A) Freeze·etched appearance of a mesosome (M) of Bacillus subtilis surrounded by cytoplasm (cy) and nucleus (N), from the study of Nanninga (1969). (B) Contrast with a thin section of a corresponding region of the cell. or in Proteus vulgaris are finer and more delicate than those in Gram-positive bacteria. , 1966). However, Pontefract et al. (1969) were able to resolve mesosome membranes in E. coli fixed by the standard osmium technique, after growing the cells in a defined medium.

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