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'Azotobacter vinelandii' in keywords
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1981 (1)
1979 (1)
1Author    H. Berndt, D. Wölfle, H. Bahl, A. SteinbiichlRequires cookie*
 Title    Evidence for Carbon Monoxide Insensitive Respiration in the Aerobic Nitrogen Fixing Bacteria Azotobacter vinelandii OP and Xanthobacter autotrophicus GZ 29  
 Abstract    In intact cells of the non-gummy Azotobacter vinelandii OP CO-insensitivity of the respiratory activity increased with decreasing dissolved oxygen tension in the bacterial suspension. Upon changing from low to high aeration conditions the CO-sensitive respiration was restored. Mea­ surement of the oxidative activity of small particles of A. vinelandii OP with N A D H , ascorbate-DCPIP and ascorbate-TMPD as substrate in the presence and absence of CO indicated that the CO-insensitive site is probably identical with cytochrome , which preferably is reduced by elec­ trons from ascorbate-DCPIP. Small particles of the gum producing A. vinelandii NCIB 8660 ap­ peared to be more sensitive towards CO with ascorbate DCPIP than the non-gummy A. vinelandii OP. In small particles the CO-insensitive DCPIP oxidase was present irrespective of the dissolved oxygen tension during cell growth. In intact cells, however, CO-insensitivity was only expressed at low dissolved oxygen tension when electrons are directed to cytochrome a ^ o in the branched re­ spiratory chain. Intact cells of Xanthobacter autotrophicus G Z 29 exhibited a similar CO-insensi-tive respiration as A. vinelandii OP. 
  Reference    Z. Naturforsch. 34c, 576—581 (1979); received February 26/April 5 1979 
  Published    1979 
  Keywords    Azotobacter vinelandii, Xanthobacter autotrophicus, Carbon Monoxide, Respiratory Chain 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0576.pdf 
 Identifier    ZNC-1979-34c-0576 
 Volume    34 
2Author    Hermann Bothe, Klaus-Peter HägerRequires cookie*
 Title    Electron Transport to Assimilatory Nitrate Reductase in A zotobacter vinelandii  
 Abstract    Assimilatory nitrate reductase was particle-bound in extracts from Azotobacter vinelandii. Nitrate reduction by particle fractions was dependent on NADPH and a particle-bound electron carrier. When the enzyme was solubilized from the particles by treatment with detergents, the particle-bound electron carrier could be substituted by ferredoxin or flavodoxin. Flavodoxin reduced at the expense of photoreduced deazaflavin was much more efficient than ferredoxin in transferring electrons to nitrate reductase. The addition o f both ferredoxin and flavodoxin to the assays with photoreduced deazaflavin gave additive effects. With the solubilized enzyme, NADPH only poorly supported nitrate reduction even after the addition of electron carriers. The experiments indicate that A. vinelandii utilizes an electron transport chain between NADPH and nitrate reductase with some properties similar to those described for the generation of reductants to nitrogenase. 
  Reference    Z. Naturforsch. 36c, 1030—1035 (1981); received July 171981 
  Published    1981 
  Keywords    Assimilatory Nitrate Reductase, Ferredoxin, Flavodoxin, Electron Transport to Nitrate Reductase, Azotobacter vinelandii 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-1030.pdf 
 Identifier    ZNC-1981-36c-1030 
 Volume    36