Journal
EARTH PLANETS AND SPACE
Volume 61, Issue 1, Pages 143-150Publisher
TERRA SCIENTIFIC PUBL CO
DOI: 10.1186/BF03352894
Keywords
Magnetotactic bacteria; FORC diagrams; magnetite
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Funding
- European Union [EIF-2005-009637]
- Max Planck Society
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In order to study the formation of magnetite in magnetotactic bacteria, FORC diagrams were measured on a set of cultured Magnetospirillum griphiswaldense, following an assay in which the iron uptake is used only for magnetite formation and not for cell growth. This enabled LIS to follow the magnetite formation independently of growth. The FORC diagrams showed a clear evolution from I size-distribution with a majority of superparamagnetic grains, to a distribution dominated by stable, single-domain grains, but still containing some superparamagnetic particles. TEM observations confirm this evolution. According to the saturation isothermal remanent magnetization cooling and warming Curves, the Verwey transition can only be seen in the most mature samples, and slightly below 120 K. This suggests that the samples may have suffered from some partial oxidation.
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