利用化学修饰的细菌视紫红质薄膜进行光学信息存储的研究

Study of the Chemically Modified Bacteriorhodopsin Film for Optical Information Storage

细菌视紫红质 (bacteriorhodopsin ,bR)具有独特的光、化学和热稳定性 .bR光循环中间态M态的最大吸收峰相对于始态明显地发生蓝移 ,所以基于bR M的光致变色模型可以为光学应用尤其是信息存储提供一个机制 .但是野生型bR中M态的寿命很短 ,不适合用来进行信息存储 .本文采用化学添加剂的方法 ,将bR/聚乙烯醇 (PVA)薄膜的中间态M态的寿命显著延长 .用此化学修饰的bR薄膜作为记录介质进行缩微图像存储 ,所得到的图像具有较高的对比度和较长的保存时间 .

Bacteriorhodopsin (bR) is a photochromic protein in the two-dimensional crystalline membrane-purple membrane, which is astonishingly stable towards chemical and thermal degradation. However, the lifetime of the M state in wild-type bR was considered to be too short for optical applications. The lifetime of the M state could be prolonged obviously when a crown ether complex was used as the chemical additive. With this chemically modified bR-PVA film as recording medium, micro images were stored on the film with higher contrast ratio and longer decay time in our self-made optical storage system. To our knowledge, it is the first time domestically to use the chemically modified bR film in the field of optical information storage based on the ground state and the M state.