ZfN: Search Results

1	Author	Liuping Chen, Thomas Gross, Hans-Dietrich Lüdemann	Requires 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

2	Author	Bor-Jih Lee, Shigeo Kitsukawa, Hidemoto Nakagawa, Shukuji Asakura, Kenzo Fukuda	Requires 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

3	Author	P. Scherer, Ch Sauer	Requires 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

4	Author	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