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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。５０Ｈ２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，强度随外加电压的增加而增强；撤去电场后该两峰均即刻消失。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。
The external electric field perpendicular to the measuring beam has a great influence on the circular dichroism of bacteriorhodopsin in the aqueous suspension of the purple membrane. 50H2 sinusoidal AC electric field produces a positive differential circular dichroism peak of 568nm, reverse electric pulse train generated about 556nm negative differential circular dichroism peak; both peak and peak showed no change with voltage However, the intensity increases with the increase of the applied voltage; the two peaks disappear immediately after the electric field is removed. The analysis suggests that there is a flexible structural change in bacteriorhodopsin under the electric field and this structural change can also be used to store information.