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

By Robert K. Poole

Advances in Microbial body structure is without doubt one of the such a lot winning and prestigious sequence from educational Press, an imprint of Elsevier. It publishes topical and demanding experiences, reading body structure to incorporate all fabric that contributes to our knowing of the way microorganisms and their part components paintings. First released in 1967, the editors have continually striven to interpret microbial body structure within the broadest context and feature by no means limited the contents to "traditional" perspectives of complete mobile body structure. Now edited via Professor Robert Poole, collage of Sheffield, Advances in Microbial body structure is still an influential and intensely good reviewed sequence.

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E. , 2005c). Biofilms of E. coli DSS640 (DtatABC) that THE BACTERIAL RESPONSE TO CHALCOGEN METALLOIDS 33 lack the highly organized microcolony structure of the isogenic, parental strain (E. coli TG1) still possess elevated tolerance to antimicrobials, including a 10-fold increased tolerance to TeO2À 3 in comparison to the corresponding planktonic cells. However, this tolerance is still diminished relative to the wild type E. , 2005c). This indicates that biofilm structure (and the interdependent metabolic stratification in the community) is only one amongst several contributing factors to chalcogen tolerance.

Selenium and tellurium oxyanions may equilibrate across the biofilm matrix at a slowed rate due to steric and/or ionic hindrance, similar to other charged molecules (Stewart, 2003). , 1999) that can affect anion speciation; in these microenvironments, certain constituents of the extracellular matrix may bind, as well as react with, these oxyanions. Sequestration of chalcogens by the biofilm matrix is thus considered here as a potential contributor to metal tolerance. The extracellular polymeric substances produced by E.

For instance, sulfate-reducing bacteria (SRB) produce sulfide (S2À) through dissimilatory sulfide biogenesis. Under low redox conditions and in the dark, precipitation of elemental selenium in SRB biofilms may occur via an abiotic reaction with bacterially generated S2À (Hockin and Gadd, 2003). , 2005). However, the amount of SeO2À 3 reduced is highly dependent on the nature of the electron donor and terminal electron acceptor. It is important to note that S. , 2005). The coordination and/or reaction of chalcogens with components of the biofilm matrix could sequester toxic anions away from the bacterial cells.

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