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Magnetotactic bacteria

About: Magnetotactic bacteria is a research topic. Over the lifetime, 1118 publications have been published within this topic receiving 43741 citations.


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Journal ArticleDOI
TL;DR: The first internet-accessible database for MTB, Database of Magnestotactic Bacteria (DMTB) is complied, it contains information of 16S rRNA gene sequences, corresponding ecological metadata, oligonucleotides, and magnetic properties of MTB.
Abstract: Magnetotactic bacteria (MTB) are of interest in microbiology, biomineralization, advanced magnetic materials, and bio-geosciences because of their ability to form highly ordered intracellular magnetic minerals. Great strides for MTB studies have been made in the past four decades. In this paper we complied the first internet-accessible database for MTB, Database of Magnestotactic Bacteria (DMTB). It contains information of 16S rRNA gene sequences, corresponding ecological metadata, oligonucleotides, and magnetic properties of MTB. The comprehensive information contained in DMTB will provide a very useful data resource for researchers from different disciplines. The website of DMTB is at http://database.biomnsl.com/.

5 citations

Journal ArticleDOI
TL;DR: In this article, the rotational diffusion of non-motile cells of magnetospirillum magneticum AMB-1 around their magnetic moment is detected, and it is shown that in this species the magnetic dipole moment is not exactly aligned with the cell body axis.
Abstract: While most quantitative studies of the motion of magnetotactic bacteria rely on the premise that the cells' magnetic dipole moment is aligned with their direction of motility, this assumption has so far rarely been challenged. Here we use phase contrast microscopy to detect the rotational diffusion of non-motile cells of Magnetospirillum magneticum AMB-1 around their magnetic moment, showing that in this species the magnetic dipole moment is, in fact, not exactly aligned with the cell body axis. From the cell rotational trajectories, we are able to infer the misalignment between cell magnetic moment and body axis with a precision of better than 1°, showing that it is, on average, 6°, and can be as high as 20°. We propose a method to correct for this misalignment, and perform a non-biased measurement of the magnetic moment of single cells based on the analysis of their orientation distribution. Using this correction, we show that magnetic moment strongly correlates with cell length. The existence of a range of misalignments between magnetic moment and cell axis in a population implies that the orientation and trajectories of magnetotactic bacteria placed in external magnetic fields is more complex than generally assumed, and might show some important cell-to-cell differences.

5 citations

Patent
18 Mar 1987
TL;DR: In order to collect the above-mentioned magnetic fine particles or separate the particles from magnetotactic bacteria gathered by culture fluid, the concentration by a micro-centrifuge is carried out and the bacterial walls are dissolved with a lysozyme solution as discussed by the authors.
Abstract: PURPOSE:Immobilized magnetic fine particles of a physiologically active substance, obtained by separating from magnetotactic bacteria, having a large surface area due to the small particle size and very large amount of the supported physiologically active substance. CONSTITUTION:The above-mentioned magnetic fine particles are separated from magnetotactic bacteria and can be used even in a state of either being covered with a coating film consisting mainly of a protein or free from the coating film. In general, the magnetic fine particles having the coating film has an advantage in that the harmony with the living body is good. In order to collect the above-mentioned magnetic fine particles or separate the particles from magnetotactic bacteria gathered by culture fluid, the concentration by a micro-centrifuge is carried out and the bacterial walls are dissolved with a lysozyme solution. The centrifugation may then be repeated. Examples of the kind of the physiologically active substance to be immobilized by the separated magnetic fine particles include enzymes, e.g. hydrolase or oxidoreductase, immunity-related substances, growth factors, nucleic acid-related substances, physiologically active substances derived from plants and other physiologically active substances.

5 citations

Book ChapterDOI
01 Jan 1991
TL;DR: The first conclusive evidence of biomagnetism was the discovery of magnetotactic bacteria in 1975 by Blakemore, who used magnetite to detect the earth's magnetic field as mentioned in this paper.
Abstract: The biological form of the ferrimagnetic mineral, magnetite, was discovered in molluscs (polyplacophora) by Lowenstam (1962). Marine molluscs such as chitons use a specialized tongue or radula, which is in effect a conveyor belt of mineralized teeth, to graze on the algae that adhere to intertidal rocks. Chiton teeth are capped with magnetite, the hard iron oxide retarding attrition. Magnetite has since been identified in metazoan species (Gould et al., 1978; Walcott et al., 1979) and bacteria (Frankel et al., 1979). Although the magnetic properties of magnetite had led to the suggestion that animals could use this mineral to detect the earth’s magnetic field, it was the discovery of magnetotactic bacteria in 1975 by Blakemore that provided the first conclusive evidence of biomagnetism.

5 citations

01 Jan 2013
TL;DR: Biogenic magnetite nanoparticles are of single domain size, high chemical purity, crystallographic perfection, arranged in chain structure, unusual morphology, elongation, biocompatible, nontoxic, highly stable and disperse well in water owing to their natural lipid coating.
Abstract: Magnetite is widely used in various area including recording material, cancer treatment, magnetic resonance imaging, magnetic probes, detection of pathogens etc. The rocks and magnetofossils are the major source of magnetite. Magnetite may be synthesized chemically by various methods. But the magnetite obtained in nature and synthesized magnetite is not suitable for biomedical application due to its non-uniform shape which is hardly crystalline. Moreover magnetite obtained from ore and synthesized chemically may not be homogeneous in composition and in an agglomerated state. Biogenic magnetite is a step ahead of the magnetite synthesized otherwise in view of the above disadvantages of the latter. Biogenic magnetite nanoparticles are of single domain size, high chemical purity, crystallographic perfection, arranged in chain structure, unusual morphology, elongation, biocompatible, nontoxic, highly stable and disperse well in water owing to their natural lipid coating. Magnetite is synthesized by wide range of organisms including bacteria, chitons, honey bees, homing pigeons, dolphins, sharks, humans which helps to detect the earth's magnetic field. Biogenic magnetite nanoparticles can be isolated easily from magnetotactic bacteria.

5 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202339
202288
202137
202061
201950
201873