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Picosecond dynamics of excitations in light‐harvesting complex B800‐850 from Chromatium minutissimum studied using fluorescence spectrochronography
Author(s) -
Godik Valentina,
Timpmann Kou,
Freiberg Arvi,
Moskalenko Andrey A.
Publication year - 1993
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(93)81041-w
Subject(s) - bacteriochlorophyll , picosecond , purple bacteria , photochemistry , light harvesting complex , fluorescence , rhodospirillum rubrum , chemistry , chlorosome , excitation , antenna (radio) , chemical physics , molecular physics , photosynthetic reaction centre , photosynthesis , optics , electron transfer , physics , photosystem ii , laser , biochemistry , quantum mechanics , enzyme , telecommunications , computer science
The picosecond dynamics of excitations in the isolated B800‐850 light‐harvesting complex of the purple sulfur bacterium Chromatium minutissimum has been studied using picosecond fluorescence spectrochronography. A short‐lived component of about 20 ps lifetime has been found at 77K at the short wavelength part of the B850 fluorescence spectrum similar to that previously described for the core antenna bacteriochlorophyll band B880 of Rhodospirillum rubrum . Evidence has been presented indicating that this component is likely to reflect excitation energy relaxation step(s) involving both photoexcited bacteriochlorophyll and the protein environment. A new kinetic scheme of excitation transfer from the peripheral antenna to the photoreceptor units in purple bacteria is suggested which takes into account these findings.