A comparative study of magnetic properties between whole cells and isolated magnetosomes of Magnetospirillum magneticum AMB-1

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	A comparative study of magnetic properties between whole cells and isolated magnetosomes of Magnetospirillum magneticum AMB-1
	Li, JH ; Pan, YX ; Liu, QS ; Qin, HF ; Deng, CL ; Che, RC ; Yang, XA
刊名	CHINESE SCIENCE BULLETIN
	2010
卷号	55 期号:1 页码:38
关键词	INDIVIDUAL MAGNETOTACTIC BACTERIA FERROMAGNETIC-RESONANCE REMANENCE MEASUREMENTS BIOMINERALIZATION CHAINS BIOTECHNOLOGY SEDIMENTS FIELD
ISSN号	1001-6538
通讯作者	Pan, YX: Chinese Acad Sci, Key Lab Earths Deep Interior, Inst Geol & Geophys, Beijing 100029, Peoples R China.
中文摘要	The magnetic properties of magnetosome magnetite are of interdisciplinary interest because magnetosomes are potential carriers of natural remanent magnetization and paleoenvironment, as well as novel nano-biomaterials in biotechnological and biomedical applications. We carried out magnetic and electron transmission microscopy analyses of fresh Magnetospirillum magneticum AMB-1 whole cells and isolated magnetosomes. Results revealed that AMB-1 synthesized single-domain magnetite magnetosomes, which are arranged in the form of linear fragmental chain. The distinct differences of magnetic properties between these two samples can be faithfully interpreted in terms of spatial arrangement of magnetosomes and magnetostatic interaction. For the whole cells, the strong intra-chain interactions and weak inter-chain interactions generate behaviors of non-interacting uniaxial single-domain particles. Its delta-ratio is 3.0 and passes the Moskowitz test. In contrast, the isolated magnetosome sample has reduced values of coercivity and delta-ratio (1.5), due to increasing three-dimensional magnetostatic interactions and collapse of magnetosome chains. These observations provide useful insights into applications of the biogenic magnetite (magnetosomes) in magnetic nano-materials and magnetofossils in the paleomagnetic and environmental magnetism.
收录类别	SCI
资助信息	National Natural Science Foundation of China [40821091, 40325011]; Chinese Academy of Sciences and Marie-Curie Fellowship (IIF) [MIF1-CT-2005-007555]
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/32858]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Li, JH,Pan, YX,Liu, QS,et al. A comparative study of magnetic properties between whole cells and isolated magnetosomes of Magnetospirillum magneticum AMB-1[J]. CHINESE SCIENCE BULLETIN,2010,55(1):38.
APA	Li, JH.,Pan, YX.,Liu, QS.,Qin, HF.,Deng, CL.,...&Yang, XA.(2010).A comparative study of magnetic properties between whole cells and isolated magnetosomes of Magnetospirillum magneticum AMB-1.CHINESE SCIENCE BULLETIN,55(1),38.
MLA	Li, JH,et al."A comparative study of magnetic properties between whole cells and isolated magnetosomes of Magnetospirillum magneticum AMB-1".CHINESE SCIENCE BULLETIN 55.1(2010):38.