Download e-book for iPad: Advances in Microbial Physiology, Vol. 24 by A.H. Rose, J. Gareth Morris and D.W. Tempest (Eds.)

By A.H. Rose, J. Gareth Morris and D.W. Tempest (Eds.)

This quantity in a research-level sequence covers various 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 phone partitions. it really is 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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E. 3 - P 0 E L 2 10 20 30 40 50 60 70 Time ( h ) FIG. 19. 5% glucose and 1% methanol. Enzyme units as given in Fig. 18. From Sahm (1977). catalase was found at low dilution rates, although the extent to which derepression occurred was different for the different enzymes and organisms. In H. polymorpha alcohol oxidase activity in the cells increased with decreasing dilution rates (Fig. 20a). Full derepression was not observed; at low dilution rates cells of glucose-limited chemostat cultures contained only 10 to 20% of the alcohol oxidase found in methanol-limited cells grown at the same dilution rate (compare van Dijken, 1976).

P. VAN DIJKEN AND W. HARDER catalase activity, does not necessarily disclose the localization of a peroxisoma1 oxidase. The hydrogen peroxide required for this reaction could have been produced elsewhere in the cell and may have reacted with catalase after diffusion towards this enzyme. However, time-course incubations with diaminobenzidineand methanol showed that the initial reaction products are localized in the central part of the peroxisomes (Fig. 5d). These results exclude the possibility of staining of the organelles as a result of diffusion of hydrogen peroxide, generated by the oxidase, from the cytoplasm into the organelle since this would have resulted in staining at the periphery of the organelles.

Both cytochemical staining techniques for the demonstration of oxidase activities, namely the direct method involving incubation of glutaraldehyde-fixed sphaeroplasts with methylamine and cerium chloride under aerobic conditions, as well as the indirect technique involving incubation of whole cells with methylamine and diaminobenzidine, resulted in positively stained microbodies indicative of the presence of amine oxidase activity in these organelles (Fig. 13e). The presence of catalase activity in these organelles was also demonstrated after incubations with diaminobenzidine and exogenous hydrogen peroxide (Fig.

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