Stochastic dynamics of magnetosomes in cytoskeleton
Stochastic dynamics of magnetosomes in cytoskeleton
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DOI：
10.1209/epl/i2004-10525-6
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发表时间：
2005-06-01
期刊：
影响因子：
--
通讯作者：
Chernavskii, DS
中科院分区：
文献类型：
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作者：
Binhi, VN;Chernavskii, DS
考虑的是纳米级的磁性粒子，磁小体，嵌入在细胞骨架和受到交流磁场和热噪声的影响的旋转。在由机械力和磁力形成的双阱势中研究了旋转。结果表明，磁小体的运动满足所谓的“随机共振”的条件下，不太紧的约束下的细胞骨架介质的弹性。规则旋转的偏移达到2 rad的值，这有助于解释低频弱磁场和地磁波动的生物效应。200 nT量级的缓慢磁场变化有效地控制了旋转。
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 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 nT control the rotations effectively.