SrasV1, Main, Exploration, bibRecord, 002001

Heat production by bacterial magnetosomes exposed to an oscillating magnetic field

Identifieur interne : 002001 ( Main/Exploration ); précédent : 002000; suivant : 002002

Heat production by bacterial magnetosomes exposed to an oscillating magnetic field

Auteurs : E. Alphandéry [France] ; S. Faure [France] ; Lydia Raison [France] ; Etienne Duguet [France] ; P. A. Howse [États-Unis] ; A. Bazylinski [États-Unis]

Source :

Journal of Physical Chemistry C [ 1932-7447 ] ; 2011.

RBID : Hal:hal-00559506

Abstract

In this work, we examined mechanisms of heat production by whole intact cells of the magnetotactic bacterium Magnetospirillum magneticum strain AMB-1, as well as by their extracted chains of magnetosomes or extracted individual magnetosomes when exposed to an oscillating magnetic field of frequency 108 kHz and field amplitudes 23 and 88 mT. In this study, magnetosomes did not contain magnetite as the magnetite oxidized to maghemite. For intact bacterial cells that contain chains of magnetosomes, heat is generated through hysteresis losses, yielding specific absorption rates (SARs) of 115 ± 12 W/g_Fe at 23 mT and 864 ± 9 W/g_Fe at 88 mT. When the chains of magnetosomes are extracted from the bacterial cells and exposed to the same magnetic field, the heat-producing mechanism includes an additional contribution that is due to their rotation in the magnetic field. This contribution appeared to result in higher observed SARs of 864 ± 13 W/g_Fe at 23 mT and 1242 ± 24 W/g_Fe at 88 mT. SAR values of 529 ± 14 W/g_Fe at 23 mT and 950 ± 18 W/g_Fe at 88 mT were obtained with individual magnetosomes whose membranes had been removed.

Url:

https://hal.archives-ouvertes.fr/hal-00559506

DOI: 10.1021/jp104580t

Affiliations:

Links toward previous steps (curation, corpus...)

to stream Hal, to step Corpus: 000076
to stream Hal, to step Curation: 000076
to stream Hal, to step Checkpoint: 000129
to stream Main, to step Merge: 002025
to stream Main, to step Curation: 002001

Le document en format XML

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          </listRelation>
        <tutelles><tutelle active="#struct-181483" type="direct"><org type="institution" xml:id="struct-181483" status="VALID">          <orgName>University of Nevada [Reno]</orgName>
          <desc>            <address>              <addrLine>1664 N. Virginia Street Reno, NV 89557</addrLine>
              <country key="US"></country>
            </address>
            <ref type="url">http://www.unr.edu/</ref>
          </desc>
        </org>
</tutelle>
</tutelles>
</hal:affiliation>
<country>États-Unis</country>
</affiliation>
</author>
</analytic>
<idno type="DOI">10.1021/jp104580t</idno>
<series><title level="j">Journal of Physical Chemistry C</title>
<idno type="ISSN">1932-7447</idno>
<imprint><date type="datePub">2011</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
</fileDesc>
<profileDesc><textClass></textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">              <p>In this work, we examined mechanisms of heat production by whole intact cells of the magnetotactic bacterium Magnetospirillum magneticum strain AMB-1, as well as by their extracted chains of magnetosomes or extracted individual magnetosomes when exposed to an oscillating magnetic field of frequency 108 kHz and field amplitudes 23 and 88 mT. In this study, magnetosomes did not contain magnetite as the magnetite oxidized to maghemite. For intact bacterial cells that contain chains of magnetosomes, heat is generated through hysteresis losses, yielding specific absorption rates (SARs) of 115 ± 12 W/g_Fe at 23 mT and 864 ± 9 W/g_Fe at 88 mT. When the chains of magnetosomes are extracted from the bacterial cells and exposed to the same magnetic field, the heat-producing mechanism includes an additional contribution that is due to their rotation in the magnetic field. This contribution appeared to result in higher observed SARs of 864 ± 13 W/g_Fe at 23 mT and 1242 ± 24 W/g_Fe at 88 mT. SAR values of 529 ± 14 W/g_Fe at 23 mT and 950 ± 18 W/g_Fe at 88 mT were obtained with individual magnetosomes whose membranes had been removed.</p>
            </div>
</front>
</TEI>
<affiliations><list><country><li>France</li>
<li>États-Unis</li>
</country>
<region><li>Aquitaine</li>
<li>Nouvelle-Aquitaine</li>
</region>
<settlement><li>Bordeaux</li>
</settlement>
<orgName><li>Université de Bordeaux</li>
</orgName>
</list>
<tree><country name="France"><noRegion><name sortKey="Alphandery, E" sort="Alphandery, E" uniqKey="Alphandery E" first="E." last="Alphandéry">E. Alphandéry</name>
</noRegion>
<name sortKey="Duguet, Etienne" sort="Duguet, Etienne" uniqKey="Duguet E" first="Etienne" last="Duguet">Etienne Duguet</name>
<name sortKey="Faure, S" sort="Faure, S" uniqKey="Faure S" first="S." last="Faure">S. Faure</name>
<name sortKey="Raison, Lydia" sort="Raison, Lydia" uniqKey="Raison L" first="Lydia" last="Raison">Lydia Raison</name>
</country>
<country name="États-Unis"><noRegion><name sortKey="Howse, P A" sort="Howse, P A" uniqKey="Howse P" first="P. A." last="Howse">P. A. Howse</name>
</noRegion>
<name sortKey="Bazylinski, A" sort="Bazylinski, A" uniqKey="Bazylinski A" first="A." last="Bazylinski">A. Bazylinski</name>
</country>
</tree>
</affiliations>
</record>

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Heat production by bacterial magnetosomes exposed to an oscillating magnetic field

Heat production by bacterial magnetosomes exposed to an oscillating magnetic field

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