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Science 22 August 1997:
Vol. 277. no. 5329, pp. 1106 - 1109
DOI: 10.1126/science.277.5329.1106
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Reports

Thermophilic Fe(III)-Reducing Bacteria from the Deep Subsurface: The Evolutionary Implications

Shi V. Liu, * Jizhong Zhou, Chuanlun Zhang, David R. Cole, M. Gajdarziska-Josifovska, Tommy J. Phelps dagger

Thermophilic (45° to 75°C) bacteria that reduce amorphous Fe(III)-oxyhydroxide to magnetic iron oxides have been discovered in two geologically and hydrologically isolated Cretaceous- and Triassic-age sedimentary basins in the deep (>860 meters below land surface) terrestrial subsurface. Molecular analyses based on 16S ribosomal RNA (rRNA) gene sequences revealed that some of these bacteria represent an unrecognized phylogenetic group of dissimilatory Fe(III)-reducing bacteria. This discovery adds another dimension to the study of microbial Fe(III) reduction and biogenic magnetism. It also provides examples for understanding the history of Fe(III)-reducing microorganisms and for assessing possible roles of such microorganisms on hot primitive planets.

S. V. Liu, J. Zhou, C. Zhang, T. J. Phelps. Environmental Sciences Division, Oak Ridge National Laboratory, Post Office Box 2008, Oak Ridge, TN 37831-6036, USA.
D. R. Cole. Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, Post Office Box 2008, Oak Ridge, TN 37831-6110, USA.
M. Gajdarziska-Josifovska, Department of Physics, University of Wisconsin, Post Office Box 413, Milwaukee, WI 53201, USA.
*   Present address: Department of Microbiology and Immunology, Allegheny University of the Health Sciences, Philadelphia, PA 19129, USA.

dagger    To whom correspondence should be addressed.

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