GEOC 184 |
| H. Y. N. Holman1, Z Lin1, N.V. Asatiani2, T.L. Kalabegishvili2, N.A. Sapojnikova2, Michael C. Martin3, Wayne R. McKinney3, and N. Ya Tsibakhashvili2. (1) Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, (2) Georgian Academy of Sciences, Tbilisi, Georgia, (3) Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Building 6R2100, Berkeley, CA 94720 |
| The Gram-positive and obligate aerobe Arthrobacters are ubiquitous in geologic materials and are known for their ability to adapt to environments strongly polluted by heavy metals such as chromium. However, little is known about the role of their survival mechanisms in the remediation and geochemical cycles of heavy metals. In this presentation we shall describe at a molecular level the survival mechanism of chromium(VI)-resistant Arthrobacter oxydans, and present microscopy and spectroscopy evidence that links the well-orchestrated survival strategy to the fine-grain formation of chromium(V)- and chromium(III)-ligand complexes. Our results will have important implications in the understanding of fate and transport and health risks of chromium and other heavy metals in terrestrial environments. |
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Vibrational Spectroscopy in the Earth and Environmental Sciences
1:30 PM-4:50 PM, Thursday, April 1, 2004 Marriott -- Marquis NE, Oral
Division of Geochemistry |