Geobacter metallireducens  is a rod shaped gram negative anaerobic bacterium which can use metals and organic compounds found in petroleum as a terminal electron acceptor  in its metabolic processes. Seen in this photo with Iron(III)Oxide it can also utilize a wide variety of other metals, including Uranium. Due to its ability to convert petroleum products into harmless Carbon Dioxide, it is useful in bio-remediation of petrol contaminated lands, as well as to precipitate uranium out of contaminated water in anoxic locations as it is an anaerobe.

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