biogeochemistry; geomicrobiology; iron reduction; cobalt reduction; magneite
Members of the genus Shewanella capable of reducing metals and forming minerals under cold-temperature conditions were isolated from 3 distinct marine habitats (the coast of Wash- ington State, the Puget Sound, and an iron-rich microbial mat off Hawaii). Cultures of microorgan- isms were isolated at 8°C on nutrient agar medium prepared in artificial seawater. Isolates in this study could use a wide variety of electron acceptors such as oxygen, nitrate, and metals, and reduce various metals coupled to the oxidation of several organic acids, glucose or hydrogen at temperatures down to 0°C. Akaganeite was reduced to either magnetite or siderite, depending on the test condi- tions. The geochemical profiles at the sample sites from which these strains were isolated spanned a temperature range of 1.8 to 11°C, and all showed active oxygen and nitrate reduction as well as metal reduction. This confirms previous reports that sediment microorganisms participating in biogeo- chemical cycles remain active at low temperatures.
Aquatic Microbial Ecology
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© 2005, Inter-Research
Stapleton, Raymond D. Jr.; Sabree, Zakee L.; Palumbo, Anthony V.; Moyer, Craig L.; Devol, Allan H.; Roh, Yul; and Zhou, Jizhong Z., "Metal Reduction at Cold Temperatures by Shewanella Isolates from Various Marine Environments" (2005). Biology. 23.