脂质泡中的菌紫质旋转运动的介质依赖性

用闪光诱导瞬间二向色性方法测量了蔗糖和甘油对菌紫质（ＢＲ）分子在脂质泡中的旋转扩散运动的影响。结果表明脂质囊泡本身在悬浮液中的运动并不会影响ＢＲ分子在膜中的旋转运动的测量。蔗糖和甘油对ＢＲ旋转运动的影响在相变温度以上和相变温度以下是不同的，相变温度以下的主要作用是相分离，使运动减慢，相变温度以上的作用可能是脂的分散，使运动加快。

THE MEDIA DEPENDENCE OF ROTATIONAL DIFUSION OF BACTERIORHODOPSIN IN VESICLS

The effect of the sucrose and glycerol on the rotational diffusion of BR in DMPC vesicles was measured by the tecnique of flash-induced transient dichroism. The results show that there is negligible contribution to the BR anisotropy decay by vesicle tumbling in DMPC vesicles. Above and below phase transition point of DMPC, the effects of the sucrose and glyserol on the rotational diffusion of BR are different. Below the phase transition point,media cause the phase separation and the rotational diffusion of BR bornes slow. Above the phase transition media maybe cause the spread of lipid, the rotational diffusion of BR becomes fast.