title: Electron spin resonance spectrum of species "X" which may function as the primary electron acceptor in photosystem I of green plant photosynthesis.
abstract: Purified Photosystem I particles from spinach when reduced with 10 mM dithionite at pH 9 exhibited a 50% light reversible-ESR Signall (P-700+) at about 10 K. It was possible to show by signal-averaging techniques that a light-reversible ESR spectrum concomitant with the reversible Single 1 can be observed with approximate principal g factors at g = 2.07, g = 1.86 and g = 1.75.
mesh_terms: D003624:Darkness; D004578:Electron Spin Resonance Spectroscopy; D004579:Electron Transport; D008027:Light; D008968:Molecular Conformation; D010788:Photosynthesis; D010944:Plants / Q000378:metabolism*