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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 
3Author    Z. NaturforschRequires cookie*
 Title    N o Correlation between Plasmid Content and Ability to Reduce N itrate in W ild-Type Strains o f Rhodobacter capsulatus  
 Abstract    Patterns o f endogenous plasmids and nitrate reduc­ tase activities were analyzed in the phototrophic bacte­ rium Rhodobacter (Rb.) capsulatus. From 10 strains in­ vestigated (including a UV-induced plasmidless nit~ mu­ tant), 4 were unable to grow photosynthetically with nitrate as N-source and lacked nitrate reductase activity (nit strains). Irrespective o f the nit phenotype, all 
  Reference    Z. Naturforsch. 46c, 703 (1991); received May 10 1991 
  Published    1991 
  Keywords    Nitrate, Plasmid, Photosynthetic Bacteria, Rhodobacter capsulatus 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0703_n.pdf 
 Identifier    ZNC-1991-46c-0703_n 
 Volume    46 
4Author    Wilhelm Hasselbach, Andrea MigalaRequires cookie*
 Title    Modulation by Monovalent Anions of Calcium and Caffeine Induced Calcium Release from Heavy Sarcoplasmic Reticulum Vesicles  
 Abstract    Both calcium and caffeine induced calcium release from actively loaded heavy sarcoplasmic reticulum vesicles were studied to analyze the dependence o f both activities on the com position o f the release medium with respect to monovalent anions. Calcium is unable to induce net cal­ cium release while caffeine remains effective as releasing agent when the experimental media contain neither chloride nor nitrate ions. Caffeine induced calcium release is not suppressed by chelating residual medium calcium (approximately 0 .5 -1 (j m) with 2 m M EGTA added 15 s prior to 10 m M caffeine. Calcium release from vesicles loaded in media containing 0.2 m glu­ conate as monovalent anion is induced when the medium is supplemented with chloride or nitrate. The release amplitude increases linearly when K-gluconate is replaced by KC1. At con­ stant ionic strength the release amplitude becomes maximal at a chloride concentration o f 0.2 m . The chloride effect com pletely disappears when 2 m M EGTA are added simultaneously. When chloride is replaced by nitrate, as releasing agent, maximal release is achieved already by addition o f 0.1 m K-nitrate. The releasing effect o f nitrate can only partially be suppressed by EGTA. The different effectiveness o f gluconate, chloride and nitrate as calcium release sup­ porting ions corresponds to their activating effect on the binding o f ryanodine to the calcium release channel in the vesicular membranes. 
  Reference    Z. Naturforsch. 47c, 440 (1992); received December 4 1991/March 16 1992 
  Published    1992 
  Keywords    Sarcoplasmic Reticulum, Calcium Release, Chloride, Nitrate, Ryanodine 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0440.pdf 
 Identifier    ZNC-1992-47c-0440 
 Volume    47 
5Author    F. López-FigueroaRequires cookie*
 Title    Control by Light Quality of Chlorophyll Synthesis in the Brown Alga Desmarestia aculeata  
 Abstract    The chlorophyll synthesis in the brown algae D esm arestia aculeata is affected by light quali­ ty and by the nutrient state in the medium before the illumination. Pulses of 5 min of red, green and blue light together with 200 |iM nitrate in plants growing under natural conditions deter­ mined similar induction of chlorophyll synthesis. However, when the plants were incubated previously under starvation conditions the light effect was different. The induction of chloro­ phyll synthesis was greater after blue and green light than after red light pulses. Red-light pho­ toreceptor was only involved in the chlorophyll synthesis under no nutrient limitations and under starvation conditions after previous illumination with blue light followed by far-red light. The induction of chlorophyll synthesis by green and blue light pulses applied together with nitrate was greater when the algae were incubated in starvation conditions than in natural conditions (normal nutrient state). Because all light effects were partially reversed by far-red light the involvement of a phyto-chrome-like photoreceptor is proposed. In addition, a coaction between blue-and a green-light photoreceptors and phytochrome is suggested. 
  Reference    Z. Naturforsch. 46c, 542—548 (1991); received February 13 1991 
  Published    1991 
  Keywords    Blue-Light Photoreceptor, Chlorophyll Synthesis, D esm arestia aculeata, Green-Light Photo­ receptor, Nitrate 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0542.pdf 
 Identifier    ZNC-1991-46c-0542 
 Volume    46