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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Properties of intracellular magnetite crystals produced by Desulfovibrio magneticus strain RS-1
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Properties of intracellular magnetite crystals produced by Desulfovibrio magneticus strain RS-1

机译：脱硫弧菌RS-1产生的胞内磁铁矿晶体的性质

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摘要

Desuffiovibrio magneticus strain RS-1 is an anaerobic sulfate-reducing bacterium. Cells form intracellular nanocrystals of magnetite but are only weakly magnetotactic. In order to understand the unusual magnetic response of this strain, we studied magnetite crystals within cells grown with fumarate and sulfate. Many cells grown under either condition did not form magnetic crystals while others contained only I to 18 small (similar to 40 nm) magnetite-containing magnetosomes. Bulk magnetic measurements of whole cells showed a superparamagnetic-like behavior, indicating that many of the magnetite crystals are too small to have a permanent magnetic moment at ambient temperature. The temperature of the Verwey transition is lower (similar to 86 K) than of magnetite from other magnetotactic strains, likely indicating partial oxidation of magnetite into maghemite. As a result of the small size and small number of magnetite magnetosomes, the magnetic moments of most cells grown anaerobically with fumarate or sulfate are insufficient for magnetotaxis.
机译：减毒弧菌RS-1是一种减少厌氧硫酸盐的细菌。细胞形成磁铁矿的细胞内纳米晶体，但仅具有弱的趋磁性。为了了解此菌株的异常磁响应，我们研究了富马酸盐和硫酸盐生长的细胞内的磁铁矿晶体。在任一种条件下生长的许多细胞均未形成磁性晶体，而其他细胞仅包含1至18个小的（约40 nm）含磁铁矿的磁小体。整个细胞的体磁测量显示出类似超顺磁性的行为，表明许多磁铁矿晶体太小而无法在环境温度下具有永久磁矩。 Verwey转变的温度比其他趋磁应变的磁铁矿的温度低（约86 K），这可能表明磁铁矿被部分氧化为磁赤铁矿。由于磁铁矿磁小体的体积小且数量少，大多数通过富马酸盐或硫酸盐厌氧生长的细胞的磁矩不足以成为趋磁性。

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