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'Superoxide' in keywords Facet   Publication Year 1980  [X]
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1Author    E. F. Elstner, H. P. Fischer, W. Osswald, G. KwiatkowskiRequires cookie*
 Title    Superoxide-and Ethane-Formation in Subchloroplast Particles: Catalysis by Pyridinium Derivatives  
 Abstract    Oxygen reduction by chloroplast lamellae is catalyzed by low potential redox dyes with E'0 values between -0 .3 8 V and -0 .6 V. Compounds o f E'0 values o f -0 .6 7 V and lower are inactive. In subchloroplast particles with an active photosystem I but devoid of photosynthetic electron transport between the two photosystems, the active redox compounds enhance chlorophyll bleaching, superoxide formation and ethane production independent on exogenous substrates or electron donors. The activities o f these compounds decrease with decreasing redox potential, with one exception: 1-methyl-4,4'-bipyridini urn bromide with an E'0 value o f lower -1 V (and thus no electron acceptor o f photosystem I in chloroplast lamellae with intact electron transport) stimulates light dependent superoxide formation and unsaturated fatty acid peroxidation in sub­ chloroplast particles, maximal rates appearing after almost complete chlorophyll bleaching. Since this activity is not visible with compounds with redox potentials below -0 .6 V lacking the nitrogen atom at the 1-position o f the pyridinium substituent, we assume that 1 -methyl-4,4'-bi-pyridinium bromide is "activated" by a yet unknown light reaction. 
  Reference    Z. Naturforsch. 35c, 770—775 (1980); received May 23/June 6 1980 
  Published    1980 
  Keywords    Superoxide, Lipid Peroxidation, Ethane, Chloroplasts, Pyridinium Salts 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0770.pdf 
 Identifier    ZNC-1980-35c-0770 
 Volume    35