Magnetic Biosignatures of Magnetosomal Greigite From Micromagnetic Calculation
Publication Date
2022Journal Title
Geophysical Research Letters
ISSN
0094-8276
Publisher
American Geophysical Union (AGU)
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Bai, F., Chang, L., Pei, Z., Harrison, R., & Winklhofer, M. (2022). Magnetic Biosignatures of Magnetosomal Greigite From Micromagnetic Calculation. Geophysical Research Letters https://doi.org/10.1029/2022GL098437
Abstract
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 their magnetic properties and magnetotaxis efficiency of greigite-producing MTB cells. Our calculations suggest coercivity (Bc) of ∼15-21 mT for intact greigite-producing rod-shaped MTB and many-celled magnetotactic prokaryotes, with Bc decreasing 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.
Sponsorship
Royal Society (NAF\R1\201096)
Identifiers
External DOI: https://doi.org/10.1029/2022GL098437
This record's URL: https://www.repository.cam.ac.uk/handle/1810/336958
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