By A.H. Rose (Editor), J. Gareth Morris (Editor)
This quantity in a research-level sequence covers different elements of microbial body structure and biochemistry together with inositol metabolisms in yeasts, bacterial adhesion, natural acids, the bacterial flagellum and the mechanical behaviour of bacterial mobile partitions. it's meant to be of use to microbiologists, biochemists and biotechnologists. different similar works during this sequence are volumes 29, 30 and 31.
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Extra resources for Advances in Microbial Physiology, Volume 19
The role of autolysins in Gram-negative species is less clear and is so far a relatively unexplored field. However, env A mutants of E. coli which grow as chains have grossly decreased autolytic activity (WolfWatz and Normark, 1976). Autolysins are enzymes hydrolysing specific bonds in peptidoglycans (Fig. 5) and, of course, their action can lead to cell disaster in the form of lysis. fueculis. The argument was reinforced by the observed (Tomasz, 1966) correlation between chain formation and loss of autolytic activity when choline in the walls of pneumococci was replaced by ethanolamine.
The other group of mutant strains always grew as cocci and the expression of the phenotype was not conditional. , 1970) but subsequent work (M. McConnell and H. J. Rogers, unpublished work) showed that it was almost certainly a multiple mutant and was not examined further. The properties of various B. subtilis mutants showing rod-to-coccus transformations are summarized in Table 3. The obvious points of departure for investigation of the relationships between morphology and physiology were the gross decrease in teichoic acids in the walls of rodA mutants when growing as cocci, and the need for glutamate, glutamine or salt to maintain the group B mutants as rods.
There is again a gradient of thickness in the developing pole, and a good deal of remodelling during and after cell separation. Because the septum closes considerably before pole formation is complete, cell separation and closure appear as much more distinct processes than in streptococci. The poles ofB. subtilis, however, account for only about 15% of the peripheral wall instead of all of it as they do in streptococci. In one of these, the immunofluorescence method, as used by Cole and Hahn (1962), was applied to an autolytic deficient-phosphoglucomutase-negative strain of B.