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PICOSECOND FLUORESCENCE AND ELECTRON TRANSFER IN PRIMARY PHOTOSYNTHETIC PROCESSES
Author(s) -
Rubin Andrew B.
Publication year - 1978
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1978.tb07741.x
Subject(s) - picosecond , bacteriochlorophyll , electron transfer , photochemistry , fluorescence , chemistry , photosynthetic reaction centre , kinetics , molecule , electron transport chain , redox , rhodobacter sphaeroides , chromatophore , photosynthesis , optics , physics , laser , biochemistry , organic chemistry , quantum mechanics , fishery , biology
. Under conditions that drive the reaction centers (RC's) into the “closed” state, the lifetime ( T ) of the fluorescence emitted by antenna molecules increases from 80 to 200 ps in PS I, from 300 to 600 ps in PS II, and from 200 to 500 ps in bacterial chromatophores. In Rhodopseudomonas sphaeroides strain 1760‐1, the decay curve for fluorescence from the RC's has a component with T 2 = 15 ps due to the bacteriochlorophyll of the RC, and a second component with T 2 = 250 ps due to bacteriopheophytin. Data on electron transfer at low temperatures and under different redox conditions are analyzed. along with the ps fluorescence kinetics. The hypothesis is discussed that electron transfer in RC's is coupled to conformation changes in the interacting molecules.