Evidence that the potential for dissimilatory ferric iron reduction is widespread among acidophilic heterotrophic bacteria.

摘要: Nineteen characterized strains and isolates of acidophilic heterotrophic bacteria were screened for their abilities to catalyse the reductive dissolution ferric iron mineral schwertmannite, under oxygen-limiting conditions. Acidocella facilis, Acidobacterium capsulatum, all Acidiphilium, Acidobacterium-like that grew in liquid cultures able reduce iron. In contrast, neither Acidisphaera rubrifaciens nor three Acidisphaera-like tested found have capacity dissimilatory reduction. One two iron-oxidizing Frateuria-like also reduced Microbial schwertmannite was paralleled with increased concentrations soluble ferrous sulfate microbial cultures, together pH values decreased redox potentials. While reduction has been described previously Acidiphilium spp., this is first report moderate acidophile Acidobacterium. The finding significant implications understanding biogeochemistry acidic environments.