title: [Temperature dependence of the kinetics of dark reduction of bacteriochlorophyll P870, oxidized by impulse laser and continuous light in photosynthetic reaction center preparations from Rhodosuedomonas spheroides strain 1760-1].
abstract: A comparative study was carried out of temperature dependence of kinetics of dark reduction of bacteriochlorophyll P870 oxidized both by pulsed laser and continuous actinic light in preparations of photosynthetic reaction centres-bacteriochlorophyll-protein complexes from Rhodopseudomonas spheroides, strain 1760-1. Half-time of the recombination of primary products--P870+ and reduced primary electron acceptor A1, which decreases with temperature lowering from 180-240 ms at 120K, is determined. Values of the rate constant of electron transfer from A1 to secondary acceptors at 29,K (2.7.10-1s-1) and the activation energy of this reaction in the range of 298-255K which is 11.8 kcal/mole are calculated.
mesh_terms: D001429:Bacteriochlorophylls / Q000378:metabolism*; D002734:Chlorophyll / Q000031:analogs & derivatives*; D003624:Darkness; D007700:Kinetics; D007834:Lasers; D008027:Light; D010084:Oxidation-Reduction; D010788:Photosynthesis; D012242:Rhodobacter sphaeroides / Q000378:metabolism*; D013696:Temperature
chemical_list: D001429:Bacteriochlorophylls; D002734:Chlorophyll
vernacular_title: Issledovanie temperaturnoĭ zavisimosti kinetiki temnovogo vosstanovleniia bakteriokhlorofilla P870, okislennogo impul'syn lazernym i postioannym svetom v preparatkh fotosinteticheskikh reaktsionnykh tsentrov iz Rhodopseudomonas spheroides shtamm 1760-1