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  • Chemistry  (6)
  • Methanobacterium thermoautotrophicum  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 120 (1979), S. 135-139 
    ISSN: 1432-072X
    Keywords: Carbon isotope discrimination ; Autotrophic CO2 fixation ; Methane formation ; Methanobacterium thermoautotrophicum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The fractionation of carbon isotopes by Methanobacterium thermoautotrophicum was studied during growth of the bacterium on H2 plus CO2 as sole carbon and energy sources. A 80% H2/20% CO2 gas mixture was continuously bubbled through the culture. At high gassing rates, in the absence of a “closed system effect”, cells and methane were found to be depleted in 13C relative to CO2 in the gas mixture by 2.4% and 3.4%, respectively. At low gassing rates, when more than 90% of the CO2 was converted to methane, the cells were enriched in 13C by 1.3% and methane was depleted in 13C by 0.5%; residual CO2 was enriched in 13C by 3.4%. The magnitude of isotope fractionation suggests that CO2 rather than bicarbonate is the active species of CO2 mainly utilized in both CO2 assimilation and CO2 reduction to methane. The apparent positive 13C-discrimination in cell carbon synthesis, which was observed at low gassing rates, indicates that most of the CO2 assimilated into cell material is not incorporated via reactions involved in CO2 reduction to methane.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 136 (1983), S. 160-162 
    ISSN: 1432-072X
    Keywords: Methanobacterium thermoautotrophicum ; Aldolase ; Fructose 1,6-bisphosphatase ; Autotrophic ; Methanogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In Methanobacterium thermoautotrophicum fructose 1,6-bisphosphate aldolase and fructose 1,6-bisphosphate phosphatase were studied, which could not be detected in previous investigations. Aldolase appeared to be a class I enzyme. Enzyme activity was only detectable in direction of aldol condensation in presence of Mg2+ and under anaerobic conditions. It was stimulated by dithioerythritol. The regulatory properties of the hexose bisphosphate phosphatase differed in many ways from those of the enzyme from other organisms.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 3 (1974), S. 176-178 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Description / Table of Contents: The determination of film thicknesses by XRFA is known from the literature. In most cases these methods are based on a comparison with defined reference films. Together with theoretical considerations a new method is developed, where no reference films are needed. An estimation on the accuracy of this method and measurements used in an energy dispersive system are discussed, and the method is evaluated.
    Notes: Die röntgnfluoreszenzanalytiche Bestimmung der Massenbelegung dünner Schichten ist literaturbekannt. Diese Methoden bauen zumeist auf einem Vergleich mit Proben difinierter. Massenbelegung auf. Es wird von der Theorie her gezeit, wie eine eichprobenfreie Messung möglich ist. Neben einer Abschätzung der mit dieser Methode verbundenen Fehler Werden die Messungen mit einem energiedispersiven Spektrometer und die rechnerische Auswertung behandelt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 355 (1967), S. 145-151 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aluminium chloride gives on reduction in pyridine a radical solution whose ESR spectrum indicates spin coupling with two Al, two N and two H nuclei, the latter being protons in 6-position. It is derived that bis-(N-dichloroaluminium)-1,1′,2,2′-tetrahydro-4,4′-bipyridyl is formed, which dissociates into radicals at the C—C linkage between the two dihydropyridyl groups. This suggestion is also based on the formation of the same radical from Cl2AlH and 4,4′-bipyridyl, and on its observed NMR contact shifts.
    Notes: Aluminiumchlorid bildet bei der Reduktion in Pyridin eine (Abb. 1a, b) radikalische Lösung, deren ESR-Spektrum durch die Kopplung des Elektronenspins mit zwei Al-, zwei N- und zwei H-Kernen zu deuten ist. Versuche mit partiell deuterierten Pyridinen zeigen, daß es sich bei den Wasserstoffatomkernen um Protonen in 6-Stellung handeln muß. Die aus diesen Ergebnissen abgeleitete Struktur ist die eines Bis-(N-dichloraluminium)-1,1′,2,2′-tetrahydro-4,4′-bipyridyls, das an der Verknüpfungsstelle zweier Dihydropyridylreste in Radikale zu dissoziieren vermag. Gestützt wird diese Formulierung durch die Addition von Dichloralan Cl2AlH, an 4,4′-Bipyridyl, bei der das gleiche Radikal entsteht. Zur Ergänzung der ESR-Kopplungskonstanten wurden die „paramagnetischen Kontaktverschiebungen“ im NMR-Spektrum gemessen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 14 (1901), S. 207-208 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 17 (1904), S. 1505-1509 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 18 (1905), S. 254-255 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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