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1991[X]
1Author    P. He, K. P. Bader, G. H. Schm, G. Renger, K. P. Bader, G. H. SchmidRequires cookie*
 Title    Mass Spectrometric Analysis of N 2-Formation Induced by the Oxidation of Hydrazine and Hydroxylamine in Flash Illuminated Thylakoid Preparations of the Filamentous Cyanobacterium Oscillatoria chalybea  
 Abstract    Analogue In tobacco chloroplasts hydrazine-dependent dinitrogen form ation measured by mass spec­ trometry as the consequence o f short saturating light flashes is always linked to a substantial oxygen uptake (1990). However, in thylakoids o f the filamentous cyanobacterium Oscillatoria chalybea this dinitrogen formation is not linked to an apparent 0 2-uptake, even at the high concentration o f 1 mM hydrazine. Whereas in tobacco chloroplasts Tris-treatment does not affect hydrazine de­ pendent dinitrogen formation up to a concentration o f 3 mM hydrazine, Tris-treatment o f thy­ lakoids o f O. chalybea affects strongly both oxygen evolution and dinitrogen evolution under a single turnover flash as well as under ten flashes. In contrast to tobacco chloroplasts, the pres­ ence o f hydrazine up to concentrations o f 3 mM does not substantially affect photosynthetic 0-,-evolution. The observed dinitrogen evolution is affected by D C M U regardless whether in­ duced by a single turnover flash or by ten flashes, whereas in tobacco dinitrogen evolution and the 0-,-uptake linked to it (which is not observed in the cyanobacterium) were clearly not af­ fected by D C M U in the single turnover flash. In Oscillatoria the earlier described Photosystem II-mediated H-,0-, formation and decom position is influenced by hydrazine. In the presence o f 300 hm hydrazine the usually present 0 2-uptake leading to H:0 : formation appears dimin­ ished. 
  Reference    Z. Naturforsch. 46c, 629 (1991); received March 21 1991 
  Published    1991 
  Keywords    Filamentous Cyanobacterium, Photosystem II, Water Splitting, S-States, Hydrogen-Peroxide 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0629.pdf 
 Identifier    ZNC-1991-46c-0629 
 Volume    46