Shawn Goldman

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Published on January 12, 2008

Author: Maria

Source: authorstream.com

Slide1:  Acknowledgements: We would like to thank NASA’s Exobiology program, who funded this research, and the NASA Astrobiology Institute, who provided travel support. References: Farquhar J, Bao HM, Thiemens M. SCIENCE. 289 (5480): 756-758 AUG 4 2000. Farquhar J, Savarino J, Airieau S, et al. J GEOPHYS RES-PLANET. 106 (E12): 32829-32839 DEC 25 2001 Pavlov AA, Kasting JF. ASTROBIOLOGY. 2 (1): 27-41 SPR 2002. Farquhar J, Wing BA. EARTH AND PLANETARY SCIENCE LETTERS. 213 (1-2): 1-13 AUG 1 2003 Walker JCG. NATURE. 329 (6141): 710-712 OCT 22 1987 Zinder, S.H. Physiological ecology of methanogens. In Ferry, J.G. (ed.) Methanogenesis: Ecology, Physiology, Biochemistry, and Genetics. Chapman and Hall, New York (1993). Magnetite stable Hematite stable H2O  H2 + ½ O2 Figure 5. Stability fields of magnetite and hematite as a function of pO2 and of pH2 at 75oC. Vertical lines indicate the drawdown limits for various metabolisms. Note the ability of Fe reducers to draw H2 down low enough for hematite stability at this temperature. H2 drawdown levels are from Zinder (6). Hematite stable Magnetite stable H2O  H2 + ½ O2 Figure 4. Stability fields of magnetite and hematite as a function of pO2 and of pH2 at 25oC. Vertical lines indicate the drawdown limits for various metabolisms. Note the inability of Fe reducers to draw H2 down low enough for hematite stability at this temperature. H2 drawdown levels are from Zinder (6).

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