ALPHANDÉRY, E.; FAURE, S.; RAISON, Lydia; DUGUET, Etienne; HOWSE, P. A.; BAZYLINSKI, D. A.

doi:10.1021/jp104580t

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

ALPHANDÉRY, E.
Institut de minéralogie et de physique des milieux condensés [IMPMC]

FAURE, S.
Nanobactérie SARL

RAISON, Lydia
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

Langue

Article de revue

Ce document a été publié dans

Journal of Physical Chemistry C. 2011, vol. 15, n° 1, p. 18-22

American Chemical Society

Résumé en anglais

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/gFe at 23 mT and 864 ± 9 W/gFe 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/gFe at 23 mT and 1242 ± 24 W/gFe at 88 mT. SAR values of 529 ± 14 W/gFe at 23 mT and 950 ± 18 W/gFe at 88 mT were obtained with individual magnetosomes whose membranes had been removed.< Réduire

Métadonnées

Licence d’utilisation du document

Heat production by bacterial magnetosomes exposed to an oscillating magnetic field

Langue

Ce document a été publié dans

Résumé en anglais

DOI

Origine

Unités de recherche