Effect of Photo-Oxidation on Energy Transfer in Light Harvesting Complex （LH2） from Rhodobacter Sphaeroides 601  

作　　者：刘康俊 刘伟民 闫永丽 董志伟 刘源 徐春和 钱士雄 

机构地区：[1]Department of Physics, Fudan University, Shanghai 200433 [2]National Key Laboratory of Surface Science, Fudan University, Shanghai 200433 [3]Shanghai Institute of Plant Physiology and Ecology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032

出　　处：《Chinese Physics Letters》2006年第9期2598-2601,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10274013 and 10374020.

摘　　要：We study the photo-oxidation of bacteriochlorophylls （BChls） in peripheral light harvesting complexes （LH2） from rhodobacter sphaeroides by using the steady absorption and the femtosecond pump-probe measurement, to realize the detailed dynamics of LH2 in the presence of photo-oxidation. The experimental results reveal that BChl-B850 radical cations may act as an additional channel to compete with the unoxidized BChl-B850 molecules for rapidly releasing the excitation energy, while the B800→B850 energy transfer rate is almost unaffected in the oxidation process.We study the photo-oxidation of bacteriochlorophylls （BChls） in peripheral light harvesting complexes （LH2） from rhodobacter sphaeroides by using the steady absorption and the femtosecond pump-probe measurement, to realize the detailed dynamics of LH2 in the presence of photo-oxidation. The experimental results reveal that BChl-B850 radical cations may act as an additional channel to compete with the unoxidized BChl-B850 molecules for rapidly releasing the excitation energy, while the B800→B850 energy transfer rate is almost unaffected in the oxidation process.

关 键 词：ONE-ELECTRON OXIDATION RHODOBACTER-SPHAEROIDES ANTENNA COMPLEXES PHOTOSYNTHETIC BACTERIA REACTION CENTERS ELECTROCHEMICAL OXIDATION RHODOSPIRILLUM-RUBRUM EXCITATION TRANSFER BACTERIOCHLOROPHYLL DYNAMICS 

分 类 号：O431.2[机械工程—光学工程]