ULTRAFAST ENERGY-TRANSFER IN CHLOROSOMES FROM THE GREEN PHOTOSYNTHETIC BACTERIUM CHLOROFLEXUS-AURANTIACUS

Citation
S. Savikhin et al., ULTRAFAST ENERGY-TRANSFER IN CHLOROSOMES FROM THE GREEN PHOTOSYNTHETIC BACTERIUM CHLOROFLEXUS-AURANTIACUS, Journal of physical chemistry, 100(9), 1996, pp. 3320-3322
Citations number
11
Categorie Soggetti
Chemistry Physical
ISSN journal
00223654
Volume
100
Issue
9
Year of publication
1996
Pages
3320 - 3322
Database
ISI
SICI code
0022-3654(1996)100:9<3320:UEICFT>2.0.ZU;2-L
Abstract
Energy transfers between the bacteriochlorophyll c and a antennae in l ight-harvesting chlorosomes from the green bacterium Chloroflexus aura ntiacus have been studied in two-color pump-probe experiments with imp roved sensitivity and wavelength versatility. The BChl c --> BChl a en ergy transfers are well simulated with biexponential kinetics, with li fetimes of 2-3 and 11 ps. They do not exhibit an appreciable subpicose cond component. In the context of a kinetic model for chlorosomes, the se lifetimes suggest that both internal BChl c processes and the BChl c --> BChl a energy-transfer step contribute materially to the empiric al rod-to-baseplate energy-transfer kinetics.