title: On the magnetic field dependence of the yield of the triplet state in reaction centers of photosynthetic bacteria.
abstract: The yield of the triplet state in reaction centers of Rhodopseudomonas sphaeroides is dependent on the strength of an applied magnetic field. Reaction centers of the wild type that lack a functional iron complexed to the primary acceptor ubiquinone show a dependence similar to that of reaction centers of the mutant R-26 in which the iron-ubiquinone complex is intact. Apparently, the iron of the iron-ubiquinone complex is not essential to the effect, but it does exert an influence on its extent. Inchromatophores, the effect is about 2-fold decreased; the value of the magnetic field at which half the effect is found is about 500 G, in contrast to this value for reaction centers, which is 50--100 G. The magnetodependence of the triplet yield is discussed in terms of the Chemically Induced Dynamic Electron Polarization mechanism (CIDEP).
mesh_terms: D001429:Bacteriochlorophylls / Q000378:metabolism; D004579:Electron Transport; D004735:Energy Transfer; D007700:Kinetics; D008280:Magnetics; D008433:Mathematics; D010788:Photosynthesis; D012242:Rhodobacter sphaeroides / Q000378:metabolism*
chemical_list: D001429:Bacteriochlorophylls