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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 >Possible evidence for dissimilatory bacterial magnetite dominating the magnetic properties of recent lake sediments
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Possible evidence for dissimilatory bacterial magnetite dominating the magnetic properties of recent lake sediments

机译：异化细菌磁铁矿主导近期湖泊沉积物磁性的可能证据

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摘要

Rock magnetic measurements, including low temperature susceptibility and Curie Temperature experiments, show that the most recent sediments from the Bay of Vidy, close to Lausanne on the north shore of Lake Geneva, Switzerland, are rich in superparamagnetic magnetite. The ~(137)Cs dated increase in magnetite concentration coincides with the beginning of sewage de-phosphatization by the addition of iron chloride. Extracts of fine-grained magnetite, imaged by transmission electron microscopy, form amorphous masses visually comparable to those detected as the product of extracellular magnetite production by bacteria. This is the first indication that extracellular, dissimilatory magnetite may survive and make a dominant contribution to the magnetic properties of sediments. Final confirmation of the bacterial origin of the magnetite will depend on rRNA sequencing.
机译：岩石磁测量，包括低温磁化率和居里温度实验，表明来自瑞士日内瓦湖北岸洛桑附近的维迪湾的最新沉积物富含超顺磁性磁铁矿。磁铁矿中〜（137）Cs的日期增加与通过添加氯化铁使污水脱磷开始有关。通过透射电子显微镜成像的细粒磁铁矿的提取物，形成的非晶质在视觉上与细菌检测到的细胞外磁铁矿产品的质量相当。这是细胞外异化磁铁矿可以生存并对沉积物的磁性产生主要作用的第一个迹象。磁铁矿细菌来源的最终确认将取决于rRNA测序。

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