Liu Weimin, Liu Yuan, Yan Yongli, Liu Kangjun, Guo Lijun, Xu Chunhe, Qian Shixiong
Physics Department, Fudan University, Shanghai 200433, China.
J Biomol Struct Dyn. 2006 Apr;23(5):529-36. doi: 10.1080/07391102.2006.10507077.
Photodynamics of two kinds of peripheral antenna complexes (LH2 of Rhodobacter sphaeroides, native LH2 (RS601) and B800-released LH2 where B800-BChls were partially or completely removed with different pH treatments), were studied using femtosecond pump-probe technique at different laser wavelengths. The obtained results for these samples with different B800/B850 ratios demonstrated that under the excitation around B800 nm, the photoabsorption and photobleaching dynamics were caused by the direct excitation of upper excitonic levels of B850 and excited state of B800 pigments, respectively. Furthermore, the removal of B800 pigments had little effect on the energy transfer processes of B850 interband/intraband transfer.
利用飞秒泵浦-探测技术，在不同激光波长下研究了两种外周天线复合物（球形红杆菌的LH2，天然LH2（RS601）和B800释放的LH2，其中通过不同pH处理部分或完全去除了B800 - 细菌叶绿素）的光动力学。对于这些具有不同B800/B850比率的样品所获得的结果表明，在800nm左右的激发下，光吸收和光漂白动力学分别是由B850的上激子能级的直接激发和B800色素的激发态引起的。此外，去除B800色素对B850带间/带内转移的能量转移过程影响很小。
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