title: Identification of an electron acceptor in reaction centers of Rhodopseudomonas spheroides by EPR spectroscopy.
mesh_terms: D001665:Binding Sites; D002734:Chlorophyll / Q000032:analysis*; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals / Q000032:analysis; D010777:Photochemistry; D012242:Rhodobacter sphaeroides / Q000378:metabolism; D012241:Rhodopseudomonas / Q000378:metabolism*; D014451:Ubiquinone / Q000032:analysis*
chemical_list: D005609:Free Radicals; D014451:Ubiquinone; D002734:Chlorophyll