Formation of single-domain magnetite by a thermophilic bacterium

Abstract

Other| December 01, 1998 Formation of single-domain magnetite by a thermophilic bacterium Chuanlun Zhang; Chuanlun Zhang Oak Ridge National Laboratory, Environmental Sciences Division, Oak Ridge, TN, United States Search for other works by this author on: GSW Google Scholar Hojatollah Vali; Hojatollah Vali Search for other works by this author on: GSW Google Scholar Christopher S. Romanek; Christopher S. Romanek Search for other works by this author on: GSW Google Scholar Tommy J. Phelps; Tommy J. Phelps Search for other works by this author on: GSW Google Scholar Shi V. Liu Shi V. Liu Search for other works by this author on: GSW Google Scholar Author and Article Information Chuanlun Zhang Oak Ridge National Laboratory, Environmental Sciences Division, Oak Ridge, TN, United States Hojatollah Vali Christopher S. Romanek Tommy J. Phelps Shi V. Liu Publisher: Mineralogical Society of America First Online: 02 Mar 2017 Online ISSN: 1945-3027 Print ISSN: 0003-004X GeoRef, Copyright 2004, American Geological Institute. American Mineralogist (1998) 83 (11-12_Part_2): 1409–1418. https://doi.org/10.2138/am-1998-11-1230 Article history First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Chuanlun Zhang, Hojatollah Vali, Christopher S. Romanek, Tommy J. Phelps, Shi V. Liu; Formation of single-domain magnetite by a thermophilic bacterium. American Mineralogist 1998;; 83 (11-12_Part_2): 1409–1418. doi: https://doi.org/10.2138/am-1998-11-1230 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract Magnetite is a common product of bacterial iron reduction and may serve as a potential physical indicator of biological activity in geological settings. Here we report the formation of single-domain magnetite under laboratory conditions by a thermophilic fermentative bacterial strain TOR-39 that was isolated from the deep subsurface. Time-course analyses were performed at 65 degrees C to study the effect of bacterial activity on solution chemistry and magnetite formation during the growth of TOR-39. Run products were examined by transmission electron microscopy. Magnetite particles formed exclusively outside of bacterial cells and exhibited octahedral shapes having relatively equal length and width (<15% difference). Tiny magnetite particles (<12 nm) nucleated between 10 and 11 h of incubation and increased to average lengths of 55.4 + or - 26.8 nm after 24 h of incubation. Between 24 h and 22 d of incubation, magnetite particles maintained average lengths of 56.2 + or - 24.8 nm. Based on size constraints, greater than 85% of the particles observed fell within the magnetic single domain. Little to no magnetite was detected in abiotic controls at 65 or 95 degrees C, or in TOR-39 cultures whose activity was suppressed. Unlike mesophilic iron-reducing bacteria (e.g., GS-15), TOR-39 produced crystals having shapes and sizes similar to some particles produced intracellularly by magnetotactic bacteria. Thus the single-domain magnetite produced by thermophiles such as TOR-39 may represent a heretofore unrecognized biological contribution to natural remanent magnetization in sedimentary basins and other geothermal environments. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.