title: Damping of oscillations in the semiquinone absorption in reaction centers after successive flashes determination of the equilibrium between Q(-)AQB and QAQ(-)B.
abstract: A quantitative model for the damping of oscillations of the semiquinone absorption after successive light flashes is presented. It is based on the equilibrium between the states Q(A)-Q(B) and Q(A) Q(-B). A fit of the model to the experimental results obtained for reaction centers from Rhodopseudomonas sphaeroides gave a value of α = [Q(A)-Q(B)I/(IQ(A)-Q(Bl)+ [Q(A)Q(-B)I) = 0.065 +/- 0.005 (T= 21°C, pH 8).
authors.forename: D
authors.initials: D
authors.lastname: Kleinfeld
authors.forename: E C
authors.initials: EC
authors.lastname: Abresch
authors.forename: M Y
authors.initials: MY
authors.lastname: Okamura
authors.forename: G
authors.initials: G
authors.lastname: Feher
mesh_terms: D000042:Absorption; D016227:Benzoquinones / Q000737:chemistry / Q000378:metabolism*; D004583:Electrons; D007834:Lasers; D008956:Models, Chemical; D012242:Rhodobacter sphaeroides / Q000737:chemistry / Q000378:metabolism*
chemical_list: D016227:Benzoquinones; C025232:semiquinone radicals