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  • Pre-column  (1)
  • Surface physics, nanoscale physics, low-dimensional systems  (1)
  • 1
    ISSN: 1612-1112
    Keywords: Capillary gas chromatography ; Natural products ; Citrus analysis ; Pre-separation by gel-permeation ; Pre-column
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Gaschromatographie von Naturstoffen wird durch nicht-flüchtige Anteile sehr erschwert. Störungen erfolgen durch Krackung und Katalysatorwirkung im Einspritzblock, Geisterpeaks und Grundlinienversatz. Mittels einer einfachen Gelchromatographie-Vortrennung wird eine Verbesserung der Citrusölanalytik beschrieben. Werden die höhermolekularen Stoffe nicht benötigt, kann man diese durch Verwendung einer Vorsäule am Gaschromatographen ausschalten. Ein einfacher Umbau am GC Gerät wird angegeben.
    Notes: Summary GC separation of natural products is upset by nonvolatile compounds. The problems arise from thermal and catalytic cracking in the injector, from ghost peaks and base line drift. A treatment is shown for obtaining an improvement in citrus analysis by using simple gelpermeation chromatography for pre-separation. A second method describes the separation of the high relative molecular mass compounds with a pre-column GC-equipment. A simple conversion is demonstrated for this modification of GC apparatus.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2011-08-23
    Description: Author(s): K. Ziegler, E. Kogan, E. Majerníková, and S. Shpyrko We study the thermal distribution of phonons in a honeycomb lattice. Due to the two electronic bands there are two out-of-plane phonon modes with respect to the two sublattices. One of these modes undergoes an Ising transition by spontaneously breaking the sublattice symmetry. We calculate the criti... [Phys. Rev. B 84, 073407] Published Mon Aug 22, 2011
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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