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1980 (1)
1979 (1)
1Author    Ursula Lehmann-Kirk, KlausP. Bader, G. Eorg, H. Schmid, Alfons RadunzRequires cookie*
 Title    Inhibition of Photosynthetic Electron Transport in Tobacco Chloroplasts and Thylakoids of the Blue Green Alga Oscillatoria chalybea by an Antiserum to Synthetic Zeaxanthin  
 Abstract    An antiserum to synthetic Z eaxanthin inhibits photosynthetic electron transport on the oxygen-evolving side of photosystem II in tobacco chloroplasts and thylakoids o f the filamentous blue-green alga Oscillatoria chalybea. The inhibition site lies for both species between the site o f electron donation of water or tetramethyl benzidine and that o f diphenyl carbazide or manganese II ions. Typical photosystem I reactions are not impaired by the antiserum. The effect of the antiserum concerning the inhibition site is practically identical to that o f the earlier described antiserum to violaxanthin. However, the degree o f inhibition seems to be generally somewhat lower with the antiserum to Zeaxanthin, than with that to violaxanthin which hints at a lesser accessibility of ze-axanthin, in the tylakoid membrane in comparison to violaxanthin. In the course of these investigations new evidence was obtained that the oxygen-evolving side of the electron transport scheme is differently organized in Oscillatoria chalybea when compared to tobacco chloroplasts. Thus, the silicomolybdate reduction with water as the electron donor is sen­ sitive to DCMU in these algae. 
  Reference    Z. Naturforsch. 34c, 1218—1221 (1979); received August 2 1979 
  Published    1979 
  Keywords    Antibodies, Oxygen-Evolving Side, Xanthophylls, Chloroplasts, Blue-Green Algae 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-1218.pdf 
 Identifier    ZNC-1979-34c-1218 
 Volume    34 
2Author    GeoffreyA. Codd, G. Eorg, H. SchmidRequires cookie*
 Title    Effects of S-^^-DichlorophenyO-N-N'-Dimethylurea on Oxygen Evolution and Fluorescence by Whole Filaments and Isolated Thylakoids of the Cyanobacterium Anabaena cylindrica  
 Abstract    The site of inhibition of DCM U against photosystem II in the cyanobacterium (Blue-green alga) Anabaena cylindrica was examined in electron transport and fluorescence studies. Isolated thylakoids catalyzed silicomolybdate photoreduction using H zO as electron donor; the steady-state reaction was completely inhibited by DCM U. This reaction is insensitive to DCM U in chloro­ plasts, since silicomolybdate accepts electrons from the prim ary photosystem II acceptor, and thus before the site of action o f D CM U in higher plants. DCM U did not increase the steady-state level of fluorescence by inact A. cylindrica, nor affect the monophasic fluorescence induction, with 
  Reference    Z. Naturforsch. 35c, 649—655 (1980); received April 18 1980 
  Published    1980 
  Keywords    Oxygen-Evolving Side, Cyanobacteria, D CM U-Sensitivity, Fluorescence 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0649.pdf 
 Identifier    ZNC-1980-35c-0649 
 Volume    35