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  • Activation energy  (1)
  • Calystegine  (1)
  • File format; File size; Geological mapping; GEOMAP; Heimefrontfjella, Antarctica; ORDINAL NUMBER; Uniform resource locator/link to raw data file; XU-FJELLA  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Theoretical chemistry accounts 73 (1988), S. 67-78 
    ISSN: 1432-2234
    Schlagwort(e): Activation energy ; Boltzmann equation ; Cross section ; Gases ; Reaction kinetics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The rate ν of bimolecular chemical reaction A+A=B+C is analyzed for simple models of reactive cross sections. Collisions of particles colliding with energy E larger than a relatively low characteristic energy E Lare either non-reactive (reversed Prigogine-Xhrouet model = rPX) or the ability to react is decreasing for E〉E L(reversed line-of-centres model = rLC). After solution of the Boltzmann equation analytical expressions for the distribution function f and the rate coefficient k have been derived. It is shown that the Arrhenius activation energy E Ais small and even negative for sufficiently small E L. The non-equilibrium corrections to ν are small.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    ISSN: 1573-5044
    Schlagwort(e): Calystegine ; tropane alkaloid ; tropinone reductase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Calystegines are a new group of polyhydroxy alkaloids with a nortropane skeleton. They were detected in Atropa belladonna root cultures by chromatographic methods (TLC, GC) and identified by NMR and mass spectroscopy. Their occurrence was examined in several species of the Solanaceae. The biosynthesis of these compounds is suggested to proceed via the tropane alkaloid pathway, the first metabolite being pseudotropine. A pseudotropine-forming tropinone reductase was isolated and characterized from Atropa belladonna root cultures. Further evidence is given for the significance of tropinone and pseudotropine in calystegine formation by feeding experiments that increased calystegine formation. 15N-tropinone was shown to be incorporated into calystegines.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    facet.materialart.
    Unbekannt
    PANGAEA
    In:  Department of Geosciences, Bremen University
    Publikationsdatum: 2023-03-13
    Beschreibung: The geological map shows the northeastern part of the polyphase deformed Sivorg Terrane in the Heimefrontfjella/Dronning Maud Land. The basement was affected by late Mesoproterozoic and Cambrian deformation and metamorphism. Geological mapping was carried out during the Antarctic Expedition 2000/01 of the Alfred Wegener Institute for Polar and Marine Research. Topographic data were obtained through stereoscopic aerial photo interpretation. The photogrammetric photo flights were undertaken in 1986 by the Institut für Angewandte Geodäsie, Frankfurt/M. Horizontal ground control points required for aerial photo interpretation were determined by means of Doppler satellite observation during the 2nd German Neuschwabenland Expedition 1985/86. Vertical ground control points were taken from unpublished map drafts at 1:100 000 scale by Norsk Polarinstitutt, Oslo. The elevation above mean sea level was transferred to Heimefrontfjella barometrically. For this reason assertions concerning the absolute elevation (referred to sea level) are uncertain. Contours and spot heights presented on the map were obtained from the photogrammetric evaluation of the photography taken in 1986; relative elevation data (height differences) are accurate to approximately ±10 m. Published by Fachbereich Geowissenschaften, Universität Bremen & Geologisches Institut, RWTH Aachen.
    Schlagwort(e): File format; File size; Geological mapping; GEOMAP; Heimefrontfjella, Antarctica; ORDINAL NUMBER; Uniform resource locator/link to raw data file; XU-FJELLA
    Materialart: Dataset
    Format: text/tab-separated-values, 12 data points
    Standort Signatur Erwartet Verfügbarkeit
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