title: Flash-induced charge separation and dark recombination in a photosystem-II subchloroplast particle.
abstract: The decay time of flash-induced absorption changes in a Photosystem-II subchloroplast fragment is very temperature sensitive down to 210 K, below which it remains constant at 1.25 +/- 0.05 ms. The difference spectrum from the near-infra-red to the ultraviolet regions indicates that the monophasic decay represents charge recombination between P-680+ and the reduced primary acceptor. The charge recombination proceeds by electron tunneling. The P-680 concentration in the TSF-IIa fragment was estimated to be one in 30 +/- 5 total chlorophyll molecules.
mesh_terms: D002734:Chlorophyll / Q000378:metabolism; D002736:Chloroplasts / Q000378:metabolism* / Q000528:radiation effects; D003080:Cold Temperature; D003624:Darkness; D004579:Electron Transport / Q000528:radiation effects; D006207:Half-Life; D007700:Kinetics; D007834:Lasers; D010788:Photosynthesis / Q000528:radiation effects*; D010944:Plants / Q000378:metabolism; D013057:Spectrum Analysis
chemical_list: D002734:Chlorophyll; C025167:P-680