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Mineralogical Magazine; February 2008; v. 72; no. 1; p. 333-336; DOI: 10.1180/minmag.2008.072.1.333
© 2008 Mineralogical Society of Great Britain and Ireland
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Session 4: Global geochemical cycles and climate change

Controlled biomineralization of magnetite (Fe3O4) by Magnetospirillum gryphiswaldense

C. Moisescu1,*, S. Bonneville2, D. Tobler2, I. Ardelean1 and L. G. Benning2

1 Department of Microbiology, Institute of Biology of the Romanian Academy, Bucharest, 060031, Romania
2 Earth and Biosphere Institute, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK

* E-mail: cristina.moisescu{at}ibiol.ro

ABSTRACT

Results from a study of the chemical composition and micro-structural characteristics of bacterial magnetosomes extracted from the magnetotactic bacterial strain Magnetospirillum gryphiswaldense are presented here. Using high-resolution transmission electron microscopy combined with selected-area electron diffraction and energy dispersive X-ray microanalysis, biogenic magnetite particles isolated from mature cultures were analysed for variations in crystallinity and particle size, as well as chain character and length. The analysed crystals showed a narrow size range (~14–67 nm) with an average diameter of 46 ± 6.8 nm, cuboctahedral morphologies and typical Gamma type crystal size distributions. The magnetite particles exhibited a high chemical purity (exclusively Fe3O4) and the majority fall within the single-magnetic-domain range.






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