By A.H. Rose, D.W. Tempest (Eds.)
This quantity in a research-level sequence covers diversified points 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 truly is meant to be of use to microbiologists, biochemists and biotechnologists. different comparable works during this sequence are volumes 29, 30 and 31.
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Additional info for Advances in Microbial Physiology, Vol. 28
Subtilis and other aerobic species to sporulate in defined media has facilitated the sophisticated physiological and genetic studies performed with this organism. In general, clostridia will sporulate in common anaerobic media containing protein hydrolysates and yeast extract (Gibbs and Hirsch, 1956; Perkins, 1965; Roberts, 1967). However, sporulation frequencies vary significantly (0 to >SO%) from one strain to another, and sporulation is often highly asynchronous. Nevertheless, studies on sporulation in complex media have been undertaken with a number of Clostridium species.
Acetobutylicum occurs in two distinct phases. During the initial phase, rapid vegetative growth is accompanied by the fermentation of substrate to acetate and butyrate. Following a pH breakpoint, the fermentation shifts to the solvent-producing phase during which growth ceases (Davies and Stephenson, 1941; Spivey, 1978). In C. , 1982). The accumulation of intracellular granules was linked to the production of a swollen phase-bright clostridial stage, to capsule production and to the cessation of cell division, and these events appeared to be a prerequisite for the onset of sporulation.
However< the butyric clostridia which have been investigated exhibited virtually no extracellular protease activity during sporulation (Mackey and Morris, 1974b; Long, 1984). Intracellular proteolytic activity has, however, been reported in cell-free extracts of two strains of C. perfringens (Loffler and Labbe, 1983). Most of the protease activity was related to sporulation in these strains. Two types of protease were detected, an alkaline serine protease and a neutral metallic protease. Kinetic studies, and studies using a stage 0 sporulation mutant, indicated that only the alkaline serine protease was sporulation specific.