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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
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.
To whom correspondence should be addressed.
Read the Full Text
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- Isolation and Characterization of Metal-Reducing Thermoanaerobacter Strains from Deep Subsurface Environments of the Piceance Basin, Colorado.
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