Stochastic dynamics of magnetosomes in cytoskeleton

V. N. Binhi; D. S. Chernavskii

doi:10.1209/epl/i2004-10525-6

All issues

Volume 70 / No 6 (June 2005)

Europhys. Lett., 70 6 (2005) 850-856

Abstract

Issue		Europhys. Lett. Volume 70, Number 6, June 2005


Page(s)		850 - 856
Section		Interdisciplinary physics and related areas of science and technology
DOI		https://doi.org/10.1209/epl/i2004-10525-6
Published online		18 May 2005

Europhys. Lett., 70 (6), pp. 850-856 (2005)

Stochastic dynamics of magnetosomes in cytoskeleton

V. N. Binhi¹ and D. S. Chernavskii²

¹ A. M. Prokhorov General Physics Institute RAS - 38 Vavilova St. Moscow 119991, Russian Federation
² P. N. Lebedev Physics Institute RAS - 53 Leninsky Av. Moscow 119991, Russian Federation

Corresponding author: vb@biomag.info

Received: 28 September 2004
Accepted: 26 April 2005

Abstract

Considered are the rotations of nanoscopic magnetic particles, magnetosomes, embedded in the cytoskeleton and subjected to the influence of an ac magnetic field and thermal noise. The rotations are studied within a double-well potential formed by mechanical and magnetic forces. It is shown that the motion of the magnetosomes meets the conditions of the so-called “stochastic resonance” under not-too-tight constraints on the elasticity of the cytoskeleton medium. The excursion of regular rotations reaches the value of 2 $\un{rad}$ that facilitates explaining the biological effects of low-frequency weak magnetic fields and geomagnetic fluctuations. Slow magnetic-field variations on the order of 200 $\un{nT}$ control the rotations effectively.

PACS: 87.50.Mn – Effects of radiation and external fields on biomolecules, cells and higher organisms: Magnetic fields / 87.10.+e – Biological and medical physics: General theory and mathematical aspects / 87.16.Ac – Subcellular structure and processes: Theory and modeling; computer simulation

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