Read e-book online Advances in Microbial Physiology, Vol. 53 PDF

By Robert K. Poole

ISBN-10: 0123737133

ISBN-13: 9780123737137

Advances in Microbial body structure is among the such a lot winning and prestigious sequence from educational Press, an imprint of Elsevier. It publishes topical and critical studies, examining body structure to incorporate all fabric that contributes to our figuring out of ways microorganisms and their part elements paintings. First released in 1967, the editors have regularly striven to interpret microbial body structure within the broadest context and feature by no means constrained the contents to "traditional" perspectives of complete phone body structure. Now edited via Professor Robert Poole, collage of Sheffield, Advances in Microbial body structure remains to be an influential and intensely good reviewed sequence.

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Additional info for Advances in Microbial Physiology, Vol. 53

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Overall, it appears that microbial metabolism is predominately responsible for the biogeotransformation of selenium oxyanions in the environment. Once inside the cell, selenium derived from selenate or selenite may be incorporated into polypeptides as selenocysteine and selenomethionine. In order for this to occur, selenium oxyanions must be reduced to selenide. , 1978). , 1994). Selenate may also react with GSH, albeit slowly (Shamberger, 1985), although selenate reduction to selenite catalyzed by periplasmic or membrane-associated nitrate reductases may be the first step for the further incorporation of selenium.

Sphaeroides operates at very low concentrations of selenium oxyanions. , 2000). The physiology of the organism appears to initially put any excess Se into a form very similar to selenomethionine, or even selenomethionine itself. , 1996). 42 DAVIDE ZANNONI ET AL. It has been suggested that members of the Rhodospirillaceae family utilize oxidized compounds, including Te and Se oxyanions, to get rid of the excess electrons produced in anaerobic photosynthesis (Moore and Kaplan, 1992, 1994). , 2007).

Furthermore, the organic chelator sodium diethyldithiocarbamate can be used to coordinate and precipitate transition metals and metalloid oxyanions in vitro. Its use produces visible metal–chelator complexes in Cu2+-treated biofilms; however, when used against Se or Te oxyanion-treated E. , 2005b). Rather, E. , 2005c). Overall, this indicates that the extracellular matrix of E. coli biofilms may sequester only small quantities of selenium and tellurium. In contrast, some microorganisms may produce chemically reactive metabolites that cause the precipitation of metalloid oxyanions in the extracellular matrix.

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Advances in Microbial Physiology, Vol. 53 by Robert K. Poole


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