细菌叶绿素
类胡萝卜素
颜料
光化学
化学
采光综合体
单重态
光合反应中心
红假单胞菌
能量转移
三重态
光合作用
电子转移
生物化学
化学物理
光系统II
分子
物理
有机化学
激发态
原子物理学
作者
Richard J. Cogdell,M.F. Hipkins,Wallace Macdonald,T. George Truscott
标识
DOI:10.1016/0005-2728(81)90138-9
摘要
Energy transfer between carotenoid and bacteriochlorophyll has been studied in isolated B-800-850 antenna pigment-protein complexes from different strains of Rhodopseudomonas sphaeroides which contain different types of carotenoid. Singlet-singlet energy transfer from the carotenoid to the bacteriochlorophyll is efficient (75-100%) and is rather insensitive to carotenoid type, over the range of carotenoids tested. The yield of carotenoid triplets is low (2-15%) but this arises from a low yield of bacteriochlorophyll triplet formation rather than from an inefficient triplet-triplet exchange reaction. The rate of the triplet-triplet exchange reaction between the bacteriochlorophyll and the carotenoid is fast (Ktt greater than or equal to 1.4 . 10(8) S-1) and also relatively independent of the type of carotenoid present.
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