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1998 (1)
1981 (1)
1Author    Bor-Jih Lee, Shigeo Kitsukawa, Hidemoto Nakagawa, Shukuji Asakura, Kenzo FukudaRequires cookie*
 Title    The Partial Oxidation of Methane to Methanol with Nitrite and Nitrate Melts  
 Abstract    The effect of reduced oxygen species on the partial oxidation of methane to methanol was examined with nitrite melts. The experimental results support the suggestion that the formation of methanol or C2 compounds depends on different reduced oxygen species, as observed in our previous work using nitrate melts. It has been suggested that the partial oxidation of methane proceeds to CH3OH or C2 compounds via parallel pathways. This suggestion was verified by increasing the oxygen concentration to carry out the partial oxidation of methane in 25 mol% NaNC>3 -75 mol% KNO3 melts. A methanol selectivity of 8.2% and a methanol yield of 0.43% were observed with CH4/O 2 = 15/1 at 575 °C, whereas with CH4/O 2 = 7/1 methanol selectivity and yield increased to 23.7% and 1.1%, respectively. The results further confirm the contribution of the superoxide ion O 2-on methanol formation. 
  Reference    Z. Naturforsch. 53b, 679—682 (1998); received February 26 1998 
  Published    1998 
  Keywords    Superoxide Ion, Nitrite, Nitrate, Partial Oxidation, Methanol 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0679.pdf 
 Identifier    ZNB-1998-53b-0679 
 Volume    53 
2Author    F. Castillo, F. J. Caballero, J. CárdenasRequires cookie*
 Title    Nitrate Photo-Assimilation by the Phototrophic Bacterium Rhodopseudomonas capsulata EjFj  
 Abstract    Rhodopseudomonas capsulata bacteria photo-assimilated nitrate under anaerobic condi­ tions, but were incapable of reducing it in the dark. The bacteria utilized dissolved N 2 as nitrogen source, but the growth in the presence o f nitrate was 5-fold higher. Nitrite was excreted to the medium, but not stoichiometrically with respect to nitrate consumption. Nitrate reductase is particulate and used reduced viologens or flavins as electron donors for nitrate reduction. The enzyme was inhibited in vitro by KCN, N aN 3, dithioerythritol and mercurials. Ammonia and other sources of reduced nitrogen repressed nitrate reductase synthesis. 
  Reference    Z. Naturforsch. 36c, 1025—1029 (1981); received July 30 1981 
  Published    1981 
  Keywords    Rhodopseudomonas capsulata EjFj, Nitrate, Nitrite, Nitrate Reductase, Photoassimilation 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-1025.pdf 
 Identifier    ZNC-1981-36c-1025 
 Volume    36