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Dissolution Morphology of Iron (Oxy)(Hydr)Oxides Exposed to the Dissimilatory Iron-Reducing Bacterium Shewanella oneidensis MR-1

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Atomic force microscopy was used to compare the dissolution morphology of iron (oxy)(hydr)oxide coated slides exposed to the dissimilatory iron reducing bacterium Shewanella oneidensis MR-1 and a Type II protein secretion mutant unable to reduce iron minerals without an exogenous electron shuttle. Dissolution morphologies of slides exposed to the wild-type organism were heterogeneous and consistent with the morphology of bacterial microcolonies observed by confocal microscopy. In contrast, dissolution morphologies of slides exposed to wild-type or mutant strains and the electron shuttling compound 9,10-anthraquinone-2,6-disulfonate were homogeneous. These results suggest that microcolony formation by the wild-type strain may limit dissolution whereas respiration using the shuttle compound relieves this limitation.

Keywords: AQDS; Shewanella oneidensis; deltagspD; dissolution morphology; microbial iron reduction

Document Type: Research Article


Affiliations: 1: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 2: School of Biology, Georgia Institute of Technology, Atlanta, GA

Publication date: March 1, 2009

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