| Development of cellular magnetic dipoles in magnetotactic bacteria. | |
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MedLine Citation:
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PMID: 20713012 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Magnetotactic bacteria benefit from their ability to form cellular magnetic dipoles by assembling stable single-domain ferromagnetic particles in chains as a means to navigate along Earth's magnetic field lines on their way to favorable habitats. We studied the assembly of nanosized membrane-encapsulated magnetite particles (magnetosomes) by ferromagnetic resonance spectroscopy using Magnetospirillum gryphiswaldense cultured in a time-resolved experimental setting. The spectroscopic data show that 1), magnetic particle growth is not synchronized; 2), the increase in particle numbers is insufficient to build up cellular magnetic dipoles; and 3), dipoles of assembled magnetosome blocks occur when the first magnetite particles reach a stable single-domain state. These stable single-domain particles can act as magnetic docks to stabilize the remaining and/or newly nucleated superparamagnetic particles in their adjacencies. We postulate that docking is a key mechanism for building the functional cellular magnetic dipole, which in turn is required for magnetotaxis in bacteria. |
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Authors:
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Damien Faivre; Anna Fischer; Inés Garcia-Rubio; Giovanni Mastrogiacomo; Andreas U Gehring |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Biophysical journal Volume: 99 ISSN: 1542-0086 ISO Abbreviation: Biophys. J. Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-08-17 Completed Date: 2010-12-01 Revised Date: 2011-08-25 |
Medline Journal Info:
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Nlm Unique ID: 0370626 Medline TA: Biophys J Country: United States |
Other Details:
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Languages: eng Pagination: 1268-73 Citation Subset: IM |
Copyright Information:
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2010 Biophysical Society. Published by Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Magnetics
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methods* Magnetosomes / metabolism*, ultrastructure Magnetospirillum / cytology*, metabolism*, ultrastructure Spectrum Analysis Time Factors |
| Comments/Corrections | |
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