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The ability of hyperthermophilic microorganisms to transfer electrons to humic substances (humics) and other extracellular quinones was evaluated. When H 2 was provided as the electron donor, the hyperthermophile, Pyrobaculum islandicum, transferred electrons to highly purified humics and the humics analog, anthraquinone-2,6-disulfonate (AQDS). A diversity of other hyperthermophilic Archaea...
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