Magnetite formation by a sulphate-reducing bacterium

Toshifumi Sakaguchi, J. Grant Burgess, Tadashi Matsunaga*

*この研究の対応する著者

研究成果: Article査読

188 被引用数 (Scopus)

抄録

BACTERIAL production of magnetite (Fe3O4)1 makes an important contribution to iron biomineralization and rcmanent magnetization of sediments2,3. Accurate magnetostratigraphy, reconstruction of the Earth's past magnetic-field behaviour and extraction of environmental information from the geomagnetic record depend on an understanding of the conditions under which bacterial magnetite is formed. In aquatic sediments, the process is thought to be restricted to a zone between the levels at which nitrate and iron reduction occur4. In sulphate-reducing habitats, deeper in the sediment, the presence of H2S reduces iron oxyhydroxides to iron sulphides5,6. Thus magnetite would not be expected to form under such reducing conditions5,7. We report here the isolation and pure culture of a dissimilatory sulphate-reducing bacterium, designated RS-1, which can synthesize intracellular magnetite particles. RS-1 is a freshwater anaerobe which is also capable of extracellular iron sulphide precipitation. This isolate illustrates the wider meta-bolic diversity of magnetic bacteria and suggests the presence of a novel mechanism of magnetic biomineralization. The discovery of such bacteria may also explain why large quantities of magnetite have been observed in sulphate-rich, oil-bearing, sedimentary deposits8-11. In addition, these results significantly enlarge the environments in which biogenic magnetite may be expected to occur and have important implications regarding the evolution of the ability to synthesize magnetite.

本文言語English
ページ(範囲)47-49
ページ数3
ジャーナルNature
365
6441
出版ステータスPublished - 1993
外部発表はい

ASJC Scopus subject areas

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