title: [Ultrastructural localization of photosystem I and II active sites in chloroplasts in situ].
abstract: Activities related to photosystem I and photosystem II are cytochemically localized at the electron microscope level by using suitable artificial electron donors and acceptors with, or without, factors uncoupling the light-induced electron flow between the two systems. Photo-oxidation of DAB, insensitive to DCMU, is linked to photosystem I activity. It occurs within the grana and stroma membranes of the chloroplasts. Photo-reduction of TC-NBT sensitive to DCMU, is a photosystem II mediated reaction. It is trapped within the grana membranes.
mesh_terms: D002736:Chloroplasts / Q000187:drug effects / Q000378:metabolism* / Q000648:ultrastructure; D004237:Diuron / Q000494:pharmacology; D004579:Electron Transport; D008027:Light; D008566:Membranes / Q000378:metabolism / Q000648:ultrastructure; D008854:Microscopy, Electron; D010788:Photosynthesis / Q000187:drug effects; D010944:Plants
chemical_list: D004237:Diuron
vernacular_title: Localisation ultra-structurale des sites d'activité des photosystèmes I et II dans les chloroplastes in situ.