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arXiv physics/0412158physics.bio-ph
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磁性纳米粒子的随机动力学和geomagnetic field中的生物取向机制

Stochastic dynamics of magnetic nanoparticles and a mechanism of biological orientation in the geomagnetic field

V. N. Binhi

摘要:

被认为是嵌入到细胞骨架的微观磁性粒子,磁小体的旋转。大量的磁小体具有两个稳定的平衡位置,在热扰动的影响下,在这两个位置之间发生跃迁。随机旋转达到弧度量级的值。转变的速率和磁小体保持在不同状态的概率取决于相对于平均磁小体取向的磁场方向。这种效应解释了在没有光学参考点的直接可见性的情况下,候鸟在长期通道中无故障定向的能力。对偏离“理想”取向的敏感度估计为1-2度。讨论了磁小体参与微波电磁场生物效应的可能性。

英文摘要:

The rotations of microscopic magnetic particles, magnetosomes, embedded into the cytoskeleton are considered. A great number of magnetosomes are shown to possess two stable equilibrium positions, between which there occur transitions under the influence of thermal disturbances. The random rotations attain the value of order of radian. The rate of the transitions and the probability of magnetosomes to stay in the different states depend on magnetic field direction with respect to an averaged magnetosome's orientation. This effect explains the ability of migrant birds to faultless orientation in long-term passages in the absence of the direct visibility of optical reference points. The sensitivity to deviation from an `ideal' orientation is estimated to be 1-2 degrees. Possible participation of magnetosomes in biological effects caused by microwave electromagnetic fields is discussed.

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