电场作用下紫膜中细菌视紫红质的圆二色性研究

垂直于测量光束的外电场对紫膜水悬浮液中的细菌视紫红质的圆二色性有很大影响。５０Ｈｚ正弦交流电场作用下产生５６８ｎｍ的正的差圆二色性峰，反向电脉冲串作用下产生５５６ｎｍ左右的负的差圆二色性峰，两峰峰位均未显示有随电压的变化而移动；但是，强度随外加电压的半加而增强；撤去电场后该两峰均即该消失。分析认为，电场下细菌视紫红质中存在柔性结构变化，这种结构变化也可用于存储信息。

STUDIES ON CIRCULAR DICHROISM OF BACTERIORHODOPSIN IN PURPLE MEMBRANE UNDER THE ACTION OF ELECTRIC FIELD

The changes occuried in the circular dichroic spectra of bacteriorhodopsin in thepurple membrane aqueous suspensions if an electric field was applied. There was a positive568nm peak of differential circular dichroic spectra under the action of 50Hz AC electricfield, but a negative one at about 556nm due to alternate pulse series. However they disappeared as soon as the field was turned off. It is suggested that the changes of flexible structure occured in the bacteriorhodopsin under the action of electric field, which may be used tostore information.