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'Cyanobacteria' in keywords Facet   Publication Year 1991  [X]
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1991[X]
1Author    T. Kentemich, G. Haverkam, H. BotheRequires cookie*
 Title    The Expression of a Third Nitrogenase in the Cyanobacterium Anabaena variabilis  
 Abstract    Physiological experiments indicate that Anabaena variabilis can express either a V-or a Fe-nitrogenase in addition to the conventional, M o-containing enzyme complex. The occur­ rence o f the Fe-nitrogenase in A. variabilis can also be concluded from D N A -D N A hybridiza­ tion experiments using cloned anfW or nifW probes coding for the smaller subunit (= nitroge­ nase reductase) o f the Fe-nitrogenase from Azotobacter vinelandii or for the same subunit o f the M o-nitrogenase from Klebsiella pneumoniae. The cyanobacterium A. variabilis is the first phototroph found to contain all three nitrogenases landii as yet. Vanadium cannot substitute for M o in 
  Reference    Z. Naturforsch. 46c, 217 (1991); received November 2 1990 
  Published    1991 
  Keywords    Alternative N itrogenases, Vanadium-Nitrogenase, Iron-Nitrogenase, Nitrate Reduction, Cyanobacteria, Anabaena variabilis 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0217.pdf 
 Identifier    ZNC-1991-46c-0217 
 Volume    46 
2Author    Gudrun Wälzlein, ElfriedeK. PistoriusRequires cookie*
 Title    Inactivation of Photosynthetic 0 2 Evolution in the Cyanobacterium Anacystis nidulans PCC 6301: Influence of Nitrogen Metabolites and Divalent Cation Concentration  
 Abstract    A n investigation about the in vivo inactivation o f photosynthetic water oxidation has been carried out in the cyanobacterium Anacystis nidulans (Synechococcus PC C 6301). Photosystem II and photosystem I activity as well as the relative am ount of the D 1 and manganese stabiliz­ ing peptide o f photosystem II were determined after growing the cells in nutrient media with variations in the nitrogen source and the concentration of the major divalent cations (M g 2+ and C a :+). The results show a rapid inactivation of water oxidation in A. nidulans in response to nitrogen deficiency and in response to reduced M g:+ and C a2+ concentrations. The inactiva­ tion o f water oxidation observed under divalent cation deficiency could be greatly accelerated when L-amino acids instead o f am m onia or nitrate were used as nitrogen source. Under these conditions inactivation o f water oxidation correlated with a rapid loss o f D 1 and with a slower loss o f the manganese stabilizing peptide from photosystem II. A possible regulation o f the photosystem II activity in A. nidulans by nitrogen metabolites is suggested. 
  Reference    Z. Naturforsch. 46c, 1024—1032 (1991); received June 26/August 19 1991 
  Published    1991 
  Keywords    Cyanobacteria, Anacystis nidulans PCC6301, Synechococcus PCC6301, Photosystem II, Photosystem I, Nitrogen Metabolism 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-1024.pdf 
 Identifier    ZNC-1991-46c-1024 
 Volume    46