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- W2169316616 abstract "Synthetic or substituted powder magnetites are generally prepared by solid phase reaction or by wet chemical methods. The objective of this study is to examine biologically facilitated production of copious amounts of extracellular metal-substituted magnetite nanoparticles. The microbially mediated synthesis of metal-substituted magnetites by Tberoanaerobacter ethanolicus (TOR-39, C1) isolated from a deep subsurface environment was investigated under anaerobic conditions. The thermophilic iron-reducing bacterium has the ability to reduce various metals in aqueous media and forms magnetite nanocrystals. No exogeneous electron carriers (i.e., anthraquinone disulfonate) or reducing agents (i.e., cysteine) were added to the anaerobic medium. The iron-reducing bacteria formed metal-substituted magnetites using iron oxide plus metals (e.g, Co, Cr, Mn, Ni. Pd, Zn, etc) under conditions of relatively low temperature ( 2200 Gauss) than the magnetism (AH/spl sim/1800 Gauss) exhibited by magnetite without metal substitution. Microbially facilitated synthesis of metal-substituted magnetites at near ambient temperatures may expand the possible use of specialized ferromagnetic nanoparticles." @default.
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- W2169316616 date "2004-05-06" @default.
- W2169316616 modified "2023-09-24" @default.
- W2169316616 title "Microbially mediated synthesis of metal-substituted magnetic nanoparticles" @default.
- W2169316616 doi "https://doi.org/10.1109/bmn.2003.1220610" @default.
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