C. H. Werkman and P. W. Wilson (Eds.)'s Bacterial Physiology PDF

By C. H. Werkman and P. W. Wilson (Eds.)

ISBN-10: 1483231364

ISBN-13: 9781483231365

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Sample text

Unfortunately, even among the fungi, division of the nucleus is not usually typical in the sense that it takes place in recognizable steps with the formation of an achromatic figure, nor is it always synchronized with the division of the cell ; furthermore, there has not yet been a satisfactory demonstration of a sexual process among the bacteria. For this reason, the search for a nucleus in the bacterial cell almost always reduced itself to a search for a body with staining properties similar to those of the chromatin of recognized nuclei.

Tryptophan and purine and pyrimidine bases were not present in any appreciable amounts. Partial hydrolysis at pH 3 to 4 liberated split products consisting of elongated particles of uniform size, with a molecular weight of 41,000. The absorption of antibodies by the flagella of Salmonella typhosa with a consequent increase in thickness, stiffness, and agglutination into loosely held groups has been observed with both the light and electron microscopes. II. The Spores of Bacteria Three types of spores may be formed by various bacteria, the endo­ spore, the arthrospore, and the chlamydospore or microcyst.

The slime layer is a jelly-like substance of low density. It is not usually visible when the living cells are observed in darkfield. In many bacteria, such as the pneumococci, the slime layer is not visible with the electron microscope except under special conditions, for instance when the cells are not sufficiently washed or diluted with distilled water to remove all but traces of the material of the medium (Knaysi, 1951), or when the cells are exposed to the homologous serum from which the slime layer binds antibodies with a consequent increase in its density; in other bacteria, the slime layer may be sufficiently dense to be visible.

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Bacterial Physiology by C. H. Werkman and P. W. Wilson (Eds.)

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Categories: Basic Science