期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 10, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL098437
关键词
biogenic greigite; magnetosome; micromagnetic simulation; magnetic biosignature; magnetic orientation
资金
- National Natural Science Foundation of China [41974074]
- Royal Society-Newton Advanced Fellowship - NSFC [42061130214, NAF\R1\201096]
By constructing micromagnetic models with realistic biogenic greigite particles, this study provides reliable magnetic criteria to detect biogenic greigite in a wide range of environmental and geological settings.
Greigite magnetosomes produced by magnetotactic bacteria (MTB) are widely distributed in natural environments, but large uncertainties remain regarding their magnetic biosignatures. Here, we have constructed micromagnetic models with realistic biogenic greigite particles to quantify the magnetic properties and magnetotaxis efficiency of greigite-producing MTB cells. Our calculations suggest coercivity (B-c) of similar to 15-21 mT for intact greigite-producing rod-shaped MTB and many-celled magnetotactic prokaryotes, with B-c decreasing to similar to 11 mT for greigite magnetofossils with clumped particles. These magnetic signatures make biogenic greigite distinguishable from typical biogenic magnetite and inorganic greigite, providing reliable magnetic criteria to detect biogenic greigite in a wide range of environmental and geological settings. Our numerical calculations suggest that rod-shaped greigite-producing MTB have a similar magnetotaxis efficiency to magnetite MTB, likely by biomineralizing more greigite crystals to compensate for the lower saturation magnetization of greigite and less ordered chains in greigite MTB cells, demonstrating biological-controlled optimization of their magnetic nanostructure.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据