Transient absorption studies of the primary charge separation in photosystem II

被引：25

作者：

Donovan, B ^{[1
]}

Walker, LA ^{[1
]}

Yocum, CF ^{[1
]}

Sension, RJ ^{[1
]}

机构：

[1] UNIV MICHIGAN,DEPT CHEM,ANN ARBOR,MI 48109

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1996年 / 100卷 / 05期

关键词：

D O I：

10.1021/jp951984v

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Femtosecond transient absorption studies of the primary charge separation in photosystem II (PSII) are presented. A careful study of the dependence of the observed signal on laser intensity demonstrates that the multiple excitation of reaction centers produces additional fast components not observed at low excitation energy. In the regime where the observed signals are linear with excitation energy, a 20 +/- 2 ps rise of the pheophytin anion absorption, bleach of the pheophytin Q(x) absorption, and appearance of the chlorophyll cation absorption are observed. Three different protocols, involving varying exposure of the PSII complex to the detergent Triton X-100; are used to prepare D1-D2-Cyt b(559) complexes from spinach. The kinetic signals are independent of the method of sample preparation.

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页码：1945 / 1949

页数：5

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