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Thermal Effects and Structural Changes of Photosynthetic Reaction Centers Characterized by Wide Frequency Band Hydrophone: Effects of Carotenoids and Terbutryn
Author(s) -
Nagy László,
Kiss Vladimir,
Brumfeld Vlad,
Osvay Károly,
Börzsönyi Ádám,
Magyar Melinda,
Szabó Tibor,
Dorogi Márta,
Malkin Shmuel
Publication year - 2015
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/php.12511
Subject(s) - carotenoid , hydrophone , photosynthesis , thermal , chemistry , acoustics , physics , biochemistry , meteorology
Photothermal characteristics and light‐induced structural (volume) changes of carotenoid‐containing and noncontaining photosynthetic reaction centers (RCs) were investigated by wide frequency band hydrophone. We found that the presence of carotenoid either does not play considerable role in the light‐induced conformational movements, or these rearrangements are too slow for inducing a photoacoustic ( PA ) signal. The kinetic component with a few tens of microseconds, exhibited by the carotenoid‐less RCs, appears to be similar to that of triplet state lifetimes, identified by other methods. The binding of terbutryn to the acceptor side is shown to affect the dynamics of the RC . Our results do not confirm large displacements or volume changes induced by the charge movements and by the charge relaxation processes in the RC s in few hundreds of microseconds time scale that accompanies the electron transfer between the primary and secondary electron acceptor quinones.