群岛中的横向扩散。扩散系数的距离依赖性。
Lateral diffusion in an archipelago. Distance dependence of the diffusion coefficient.
作者信息
Saxton M J
机构信息
Plant Growth Laboratory, University of California, Davis 95616.
出版信息
Biophys J. 1989 Sep;56(3):615-22. doi: 10.1016/S0006-3495(89)82708-0.
Abstract
An understanding of the distance dependence of the lateral diffusion coefficient is useful in comparing the results of diffusion measurements made over different length scales, and in analyzing the kinetics of mobile redox carriers in organelles. A distance-dependent, concentration-dependent diffusion coefficient is defined, and it is evaluated by Monte Carlo calculations of a random walk by mobile point tracers in the presence of immobile obstacles on a triangular lattice, representing the diffusion of a lipid or a small protein in the presence of immobile membrane proteins. This work confirms and extends the milling crowd model of Eisinger, J., J. Flores, and W. P. Petersen (1986. Biophys J. 49:987-1001). Similar calculations for diffusion of mobile particles interacting by a hard-core repulsion yield the distance dependence of the self-diffusion coefficient. An expression for the range of short-range diffusion is obtained, and the distance scales for various diffusion measurements are summarized.
摘要
了解横向扩散系数的距离依赖性，对于比较在不同长度尺度上进行的扩散测量结果以及分析细胞器中移动氧化还原载体的动力学非常有用。定义了一个与距离和浓度相关的扩散系数，并通过蒙特卡罗计算来评估，该计算是关于移动点示踪剂在三角形晶格上存在固定障碍物时的随机游走，代表脂质或小蛋白质在存在固定膜蛋白时的扩散。这项工作证实并扩展了艾辛格、J. 弗洛雷斯和W. P. 彼得森（1986年。《生物物理杂志》49:987 - 1001）的研磨人群模型。对通过硬核排斥相互作用的移动粒子扩散进行的类似计算得出了自扩散系数的距离依赖性。获得了短程扩散范围的表达式，并总结了各种扩散测量的距离尺度。
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