Bacterial Manganese Reduction and Growth with Manganese Oxide as the Sole Electron Acceptor

Science  03 Jun 1988:
Vol. 240, Issue 4857, pp. 1319-1321
DOI: 10.1126/science.240.4857.1319


Microbes that couple growth to the reduction of manganese could play an important role in the biogeochemistry of certain anaerobic environments. Such a bacterium, Alteromonas putrefaciens MR-1, couples its growth to the reduction of manganese oxides only under anaerobic conditions. The characteristics of this reduction are consistent with a biological, and not an indirect chemical, reduction of manganese, which suggest that this bacterium uses manganic oxide as a terminal electron acceptor. It can also utilize a large number of other compounds as terminal electron acceptors; this versatility could provide a distinct advantage in environments where electron-acceptor concentrations may vary.

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