气候变化领域集成服务门户(CCPortal): Biomineralization and Magnetism of Uncultured Magnetotactic Coccus Strain THC-1 With Non-chained Magnetosomal Magnetite Nanoparticles

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DOI	10.1029/2020JB020853
	Biomineralization and Magnetism of Uncultured Magnetotactic Coccus Strain THC-1 With Non-chained Magnetosomal Magnetite Nanoparticles
	Li J.; Menguy N.; Leroy E.; Roberts A.P.; Liu P.; Pan Y.
发表日期	2020
ISSN	21699313
卷号	125 期号:12
英文摘要	Magnetotactic bacteria (MTB) have long fascinated geologists and biologists because they biomineralize intracellular single domain (SD) magnetite crystals within magnetosomes that are generally organized into single or multiple chains. MTB remains in the geological record (magnetofossils) are ideal magnetic carriers and are used to reconstruct paleomagnetic and paleoenvironmental information. Here we studied the biomineralization and magnetic properties of magnetosomal magnetite produced by uncultured magnetotactic coccus strain THC-1, isolated from the Tanghe River, China, by combining transmission electron microscope (TEM) and rock magnetic approaches. Our results reveal that THC-1 produces hexagonal prismatic magnetite single crystals that are elongated along the [111] crystallographic direction. Most of the magnetite crystals within THC-1 are dispersed without obvious chain assembly. A whole-cell THC-1 sample yields a normal SD hysteresis loop and a Verwey transition temperature of ~112 K. In contrast to MTB cells with magnetosome chain(s), THC-1 cells have a teardrop first-order reversal curve distribution that is indicative of moderate interparticle interactions. Due to the absence of a magnetosome chain, THC-1 has relatively high values of the difference between the saturation isothermal remanent magnetization (SIRM) below and above the Verwey transition temperature for field-cooled and zero field-cooled SIRM curves (δFC, δZFC) and a low δFC/δZFC value. Together with previous studies, our results demonstrate that some MTB species/strains can form magnetosomal magnetite without linear chain configurations. Magnetite produced by MTB has diverse magnetic properties, which are distinctive but not necessarily unique compared to other magnetite types. Therefore, combining bulk magnetic measurements and TEM observations remains necessary for identifying magnetofossils in the geological record. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	biomineralization; magnetic properties; magnetofossil identification; magnetotactic bacteria; non-chain magnetosome; THC-1
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187443
作者单位	Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Innovation Academy for Earth Sciences, Chinese Academy of Sciences, Beijing, China; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; International Associated Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms (LIA-MagMC), CNRS-CAS, Beijing, China; Sorbonne Université, UMR CNRS 7590, MNHN, IRD, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, Paris, France; Institut de Chimie et des Matériaux Paris Est, Univ Paris Est Creteil, CNRS, UMR 7182, Thiais, France; Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Li J.,Menguy N.,Leroy E.,et al. Biomineralization and Magnetism of Uncultured Magnetotactic Coccus Strain THC-1 With Non-chained Magnetosomal Magnetite Nanoparticles[J],2020,125(12).
APA	Li J.,Menguy N.,Leroy E.,Roberts A.P.,Liu P.,&Pan Y..(2020).Biomineralization and Magnetism of Uncultured Magnetotactic Coccus Strain THC-1 With Non-chained Magnetosomal Magnetite Nanoparticles.Journal of Geophysical Research: Solid Earth,125(12).
MLA	Li J.,et al."Biomineralization and Magnetism of Uncultured Magnetotactic Coccus Strain THC-1 With Non-chained Magnetosomal Magnetite Nanoparticles".Journal of Geophysical Research: Solid Earth 125.12(2020).