Relaxation processes accompanying electron stabilization in the quinone acceptor part of Rb. sphaeroides reaction centers

Publication date: Available online 5 October 2018Source: Journal of Photochemistry and Photobiology B: BiologyAuthor(s): P.P. Knox, E.P. Lukashev, V.V. Gorokhov, N.Kh. Seifullina, V.Z. PaschenkoAbstractThe temperature dependence of the dark recombination rate in photooxidized bacteriochlorophyll (P) and photoreduced quinone acceptors (ubiquinones) QA and QB of photosynthetic reaction centers of purple bacteria Rhodobacter sphaeroides (Rb. sphaeroides) was studied. Photoinduced changes in the absorption were detected in the Qx absorption band of photooxidized bacteriochlorophyll at 600 nm and in the bands corresponding to the redox changes of ubiquinones at 335 and 420–450 nm. Kinetic analysis was used to evaluate the activation energy and the characteristic time of the transient proc...

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