Knox R S, Davidovich M A
Biophys J. 1978 Dec;24(3):689-712. doi: 10.1016/S0006-3495(78)85414-9.
Many cells and cell fragments are known to assume specific alignments with respect to an applied magnetic field. One indicator of this alignment is a difference between the intensities of fluorescence observed in polarizations parallel and perpendicular to the magnetic filed. We calculate these two intensities using a model that assumes axially symmetric membranes and that covers a wide variety of shapes from flat disk to right cylinder. The fluorescence is assumed to originate at chromophores randomly exicted but nonrandomly oriented in the membranes. The membrane alignment is assumed to be due to the net torque on a nonrandom distribution of diamagnetically anisotropic molecules. The predicted results are consistent with most magnetoorientation data from green cells, but we are able to show that Chlorella data are not consistent with the hypothesis that the membranes have, and maintain, a cuplike configuration.
已知许多细胞和细胞碎片会相对于外加磁场呈现特定的排列方式。这种排列的一个指标是在平行和垂直于磁场的偏振方向上观察到的荧光强度差异。我们使用一个模型来计算这两种强度，该模型假设膜具有轴对称性，并且涵盖了从扁平圆盘到直圆柱等多种形状。假设荧光起源于膜中随机激发但非随机取向的发色团。假设膜的排列是由于抗磁各向异性分子的非随机分布上的净扭矩所致。预测结果与来自绿色细胞的大多数磁取向数据一致，但我们能够表明小球藻的数据与膜具有并保持杯状构型这一假设不一致。
