THE FREE-ENERGY DIFFERENCE BETWEEN THE EXCITED PRIMARY DONOR P-1-STAR AND THE RADICAL PAIR STATE P+H- IN REACTION CENTERS OF RHODOBACTER-SPHAEROIDES

被引：22
|
作者：
OGRODNIK, A
机构：
[1] Institut für Physikalische und Theoretische Chemie, Technische Universität München, Garching
来源：
BIOCHIMICA ET BIOPHYSICA ACTA | 1990年 / 1020卷 / 01期
关键词：
(Rb sphaeroides); Delayed fluorescence; Free energy difference; Photosynthesis; Radical pair state; Reaction center;
D O I：
10.1016/0005-2728(90)90094-K
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
The Gibbs free energy difference between the excited primary donor and the relaxed radical pair state P+H- in quinone-depleted reaction centers of Rhodobacter sphaeroides has been determined from various measurements of the delayed fluorescence to be 0.25 eV. Comparing this value with other energy data an entropy change of ΔS(1P* - P+H-) {reversed tilde equals} 1.9 · 10-4 eV/K is expected, giving only a small contribution at room temperature. Furthermore an upper limit, ΔG(1P* - P+B-) < 0.09 eV, is determined. © 1990.
引用
收藏
页码：65 / 71
页数：7
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