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CAROTENOID TRIPLET STATES IN PHOTOSYNTHETIC BACTERIA
Author(s) -
Frank Harry A.,
Machnicki John,
Felber Mary
Publication year - 1982
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.1751-1097.1982.tb02635.x
Subject(s) - rhodospirillum rubrum , electron paramagnetic resonance , rhodobacter sphaeroides , photosynthetic reaction centre , carotenoid , chemistry , triplet state , photochemistry , spectral line , rhodospirillaceae , photosynthesis , physics , nuclear magnetic resonance , electron transfer , biochemistry , molecule , quantum mechanics , organic chemistry , enzyme
— The triplet state spectra of anaerobically grown cells of Rhodopseudomonas sphaeroides GIC and R. sphaeroides wild type and aerobically grown cells of R. sphaeroides wild type were examined under reducing and non‐reducing conditions at 100 K. by electron paramagnetic resonance (EPR). Large differences in the zero field splitting parameters, |D| and |E| of the triplets are seen to arise in the different preparations. The spectra are assigned to the triplet states of carotenoids, some of which are closely associated with the reaction center and others are contained in the light harvesting complex. Taken together with the triplet state data on Rhodospirillum rubrum wild type previously published the trends in the zero field splitting parameters can be understood in terms of the extent of electron derealization in carotenoids of varying length.