细菌视紫红质的两种光电微分响应及其机制

利用MATLAB软件对细菌视紫红质 (BR)膜光电器件的脉冲响应实验数据进行拟合 ,得到器件的冲激响应函数。据此用SIMULINK模块构造出了反映BR光电器件特性的仿真系统。利用此系统对不同间断光入射BR光电器件时的输出响应信号进行了仿真计算。通过分析得出结论 :以前所描述的微分响应 (发生在毫秒到秒的时间量级 ,在光打开时产生一个正脉冲 ,在光关掉时产生一个负脉冲 )并非BR分子固有的特性 ,部分是由于测量电路引起的。BR分子本身特性引起的微分响应是发生在微秒时间量级 ,而且在光打开时产生一个负脉冲 ,在光关掉时产生一个正脉冲。对这两种微分响应产生的机制分别进行了探讨

Two Types of Photoelectric Differential Responses of Bacteriorhodopsin and Their Mechanisms

Based on experimental measurement of the pulse response of the bacteriorhodopsin (BR) film photocell, the impact response function of the device is obtained by data fitting with MATLAB software. A simulation system is accordingly built with the SIMULINK module. The output response signals of the BR film photocell under different stepping incident light are calculated based on this simulation system. It is concluded that the differential response described before (which occurs in milliseconds to seconds, outputs a positive pulse when light is on, and outputs a negative pulse when light is off) was not the intrinsic property of the BR molecule, but was partially caused by the measuring circuit. The differential response caused by the intrinsic property of the BR molecule happened in microsecond time scale, and it produced a negative pulse when light is on and a positive pulse when light is off. The mechanisms of the two types of differential responses are discussed.