FEMTOSECOND DYNAMICS OF ENERGY-TRANSFER IN B800-850 LIGHT-HARVESTING COMPLEXES OF RHODOBACTER-SPHAEROIDES

被引：87

作者：

TRAUTMAN, JK

SHREVE, AP

VIOLETTE, CA

FRANK, HA

OWENS, TG

ALBRECHT, AC

机构：

[1] CORNELL UNIV,PLANT BIOL SECT,ITHACA,NY 14853

[2] UNIV CONNECTICUT,DEPT CHEM,STORRS,CT 06269

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 1990年 / 87卷 / 01期

关键词：

Bacteriochlorophyll; Carotenoid;

D O I：

10.1073/pnas.87.1.215

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We report femtosecond transient absorption studies of energy transfer dynamics in the B800-850 light-harvesting complex (LHC) of Rhodobacter sphaeroides 2.4.1. For complexes solubilized in lauryldimethylamine-N-oxide (LDAO), the carotenoid to bacteriochlorophyll (Bchl) B800 and carotenoid to Bchl B850 energy transfer times are 0.34 and 0.20 ps, respectively. The B800 to B850 energy transfer time is 2.5 ps. For complexes treated with lithium dodecyl sulfate (LDS), a carotenoid to B850 energy transfer time of ≤0.2 ps is seen, and a portion of the total carotenoid population is decoupled from Bchl. In both LDAO-solubilized and LDS-treated complexes an intensity-dependent picosecond decay component of the excited B850 population is ascribed to excitation annihilation within minimal units of the LHC.

引用

页码：215 / 219

页数：5

共 23 条

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