Download Advances in Biochemical Engineering, Volume 4 by Y. Miura (auth.) PDF

By Y. Miura (auth.)

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Introduction Freely suspended microorganisms often occur in groupings or flocs with a characteristic size many orders of magnitude greater than that of a single microorganism. g. aluminium and calcium chloride (Aiba and Nagatani, 1971), or floc size can be decreased by increased shear (Aiba and Nagatani, 1971) or surface-active agents (Mallette, 1969). At the present time it seems reasonable to suggest that all organisms can occur either as single cells or in multi-cell groups; however, some microorganisms have a tendency to form larger flocs than others, under what are apparently the same environmental conditions.

S. Daoud ponents Mill (1966) found that there was little difference in the polysaccharide composition of the walls of flocculent and non-flocculent strains of Saccharomycescerevisiae, but the degree of phosphorylation of the mannan was greater in flocculent than non-flocculent strains. The observation (Mill, 1964) that certain nitrogeneous compounds when added to the medium delayed the onset of flocculation was related (Mill, 1966) to the fact that a higher nitrogen content was found in the non-flocculent walls.

2. Aggregation Mechanisms . . . . . . . . . . . . . . . . . . . 1 Polymer-Colloid Flocculation . . . . . . . . . . . . . . . . . 2 Microbial Floccutation . . . . . . . . . . . . . . . . . . . 3. Factors Affecting Floc F o r m a t i o n . . . . . . . . . . . . . . . . . 1 Microbiological Factors . . . . . . . . . . . . . . . . . . 2 E n v i r o n m e n t . . . . . . . . . . . . .

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