Pertumbuhan mikroba hyperthermophilic mengkonversi gas hidrogen, gas karbon dioksida, dan besi menjadi besi magnetik karat hitam.

Growth of hyperthermophilic microbes that grow at 203°F (95°C) and convert hydrogen gas, carbon dioxide gas, and iron rust (brown material in left tube) into black magnetic iron (right tube). Red magnets are seen flanking both tubes. Image courtesy of James F. Holden, UMass Amherst.

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