Thermal pool microbes metabolize hydrogen directly from their environment.


"Microbes living in the hot springs of Yellowstone National Park use primarily hydrogen for fuel, a discovery University of Colorado at Boulder researchers say bodes well for life in extreme environments on other planets and could add to understanding of bacteria inside the human body. A team of CU-Boulder biologists led by Professor Norman Pace published their report 'Hydrogen and bioenergetics in the Yellowstone geothermal system' this week in the online edition of the Proceedings of the National Academy of Sciences. The team's findings, based on several years of research at the park, refute the popular idea that sulfur is the main source of energy for tiny organisms living in thermal features." (University of Colorado at Boulder 2005)

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Yellowstone microbes fueled by hydrogen, according to U. of Colorado study