title: Mössbauer spectra of photosystem-I-reaction centres from the blue-green alga Chlorogloea fritschii.
abstract: Substantial amounts of iron have been shown by Mössbauer spectroscopy to be present in Photosystem-I preparations from the blue-green alga Chlorogloeta fritschii. Changes in the spectra on chemical reduction provide evidence that some of this iron is very similar to that found in the 4Fe-4S centres of ferredoxins. Such reduced samples also show e.p.r. signals consistent with maximum reduction of iron-sulphur centres A and B of Photosystem I. An unchanged component in the spectra indicates, assuming all centres A and B are reduced, the presence of another iron-containing species.
mesh_terms: D002462:Cell Membrane / Q000032:analysis; D000458:Cyanobacteria / Q000032:analysis*; D004578:Electron Spin Resonance Spectroscopy; D007501:Iron / Q000032:analysis; D010084:Oxidation-Reduction; D010788:Photosynthesis; D013053:Spectrophotometry
chemical_list: D007501:Iron