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1Author    Liuping Chen, Thomas Gross, Hans-Dietrich LüdemannRequires cookie*
 Title    The T, /7-Dependence of the Chemical Shift of the Hydroxyl Protons in Deeply Supercooled Methanol and Water  
 Abstract    The hydroxyl proton chemical shifts 6 (H-O) of supercooled methanol (7" min = 149 K) and water have been determined (7" min = 183 K), and the pressure dependence of these shifts was measured up to 200 MPa. In both compounds the downfield shift of <5 (H-O) continues down to the lowest tempera-tures reached. This result disagrees with the two state models for the hydrogen bond formation in both liquids. The isotherms ö (H 2 0) show for T< 273 K an upfield shift that becomes more pronounced with decreasing temperature. For 6 (H-O-CH^), increasingp causes at all temperatures a downshift. 
  Reference    Z. Naturforsch. 55a, 473—477 (2000); received November 11 1999 
  Published    2000 
  Keywords    NMR, Supercooling, Pressure, Methanol, Water 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0473.pdf 
 Identifier    ZNA-2000-55a-0473 
 Volume    55 
2Author    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 
3Author    P. Scherer, Ch SauerRequires cookie*
 Title    State of Iron in the Archaebacterium Methanosarcina barkeri Grown on Different Carbon Sources as Studied by Mössbauer Spectroscopy  
 Abstract    Cells of the archaebacterium Methanosarcina barkeri were grown strictly anaerobic in defined media. 57Fe-Mössbauer Spectroscopy o f methanol grown cells oxidized in the presence o f air demonstrated only the state o f Fe3+ whereas active cells under reducing conditions offered spectra of two additional iron sites in the Fe2+ state. Furthermore the 57Fe hyperfine interaction data at different temperatures gave evidence that cells cultivated with methanol or acetate as substrate contained ferredoxin like compounds. 
  Reference    Z. Naturforsch. 37c, 877 (1982); received April 27/May 261982 
  Published    1982 
  Keywords    Archaebacterium, Methanosarcina, Methanol, Iron, Mössbauer, Ferredoxin 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0877.pdf 
 Identifier    ZNC-1982-37c-0877 
 Volume    37 
4Author    Erwin Schauenstein, Wolfram Saenger, RudolfJörg Schaur, Gemot Desoye, Wolfgang Schreibmayer, N.Requires cookie*
 Title    Der Einfluß des pH, der Temperatur und der Polarität des Lösungsmittels auf die Absorption des reduzierten und oxidierten Nicotinamidadenin-dinucleotids bei 260 nm Influence of pH, Temperature and Polarity of the Solvent on the Absorption of NADH+ and NADH at 260 nm  
  Reference    Z. Naturforsch. 35c, 76—7 (1980); eingegangen am 30. März/26. Septem ber 1979 
  Published    1980 
  Keywords    AD H, UV-Absorption, Tem perature, Methanol, Enthalpy of Conform ational Change 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0076.pdf 
 Identifier    ZNC-1980-35c-0076 
 Volume    35