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Biological Oxidation of Fe(II)-Bearing Smectite by Microaerophilic Iron Oxidizer <i>Sideroxydans lithotrophicus</i> Using Dual Mto and Cyc2 Iron Oxidation Pathways
November 2022 • Nanqing Zhou, Robert Kupper, Jeffrey G. Catalano, Aaron Thompson, Clara S. Chan
Fe(II) clays are common across many environments, making them a potentially significant microbial substrate, yet clays are not well established as an electron donor. Therefore, we explored whether Fe(II)-smectite supports the growth of <i>Sideroxydans lithotrophicus</i> ES-1, a microaerophilic Fe(II)-oxidizing bacterium (FeOB), using synthesized trioctahedral Fe(II)-smectite and 2% oxygen. <i>S. lithotrophicus</i> grew substantially and can oxidize Fe(II)-smectite to a higher extent than abiotic oxidation, based o…
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