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The use of bacteria as a novel biotechnology to facilitate the production of nanoparticles is in its infancy. We describe a bacterially mediated electrochemical process in which metal (Co, Cr, or Ni)-substituted magnetite powders were synthesized by iron(III)-reducing bacteria under anaerobic conditions. Amorphous Fe(III) oxyhydroxides plus soluble metal species (Co, Cr, Ni) comprise the electron...
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