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  • FTIR  (1)
  • Grasshoppers  (1)
  • Ligurotettix  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Long-term memory in territorial grasshoppers (1989)
    Springer
    Cellular and molecular life sciences 45 (1989), S. 775-777 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Grasshoppers ; herbivory ; homing behavior ; host plant chemistry ; landmark navigation ; Ligurotettix ; memory ; territoriality
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Males ofLigurotettix spp. grasshoppers (Orthoptera, Acrididae, Gomphocerinae), territorial species that defend individual host plant shrubs, home to their territories by memorizing landmarks. Thus, the insects can navigate efficiently toward high quality shrubs which are chemically distinctive and recognizable via gustation, but indistinguishable from a distance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01974587
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    An FTIR spectroscopic study of hydrogen-bonding competition in entrainer-cosolvent mixtures (1990)
    Springer
    International journal of thermophysics 11 (1990), S. 119-132 
    Details
    ISSN: 1572-9567
    Schlagwort(e): entrainer ; FTIR ; hydrogen bonding ; supercritical
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In chemical separation processes such as supercritical extraction the use of an entrainer cosolvent can dramatically improve selectivity and yield. Ideally, in an extraction process, an entrainer cosolvent should complex with only the desired solute, pulling it from the feed. But not all cosolvents are entrainers, and a cosolvent that is effective in one application may not be effective in others. Often, competing hydrogen bonding interactions limit the effectiveness of an entrainer cosolvent. In this paper FTIR spectroscopy is used to study hydrogen bonding competition in solute/solvent/entrainer cosolvent mixtures. The extent of hydrogen bonding is determined from analysis of hydrogen-bonded and non-hydrogen-bonded infrared absorption peaks. Since these peaks overlap, curvefitting and Fourier self-deconvolution techniques are used to resolve them. Concentrations of monomeric and hydrogen-bonded species are modeled using the associated perturbed anisotropic chain theory (APACT). Using APACT it is shown that the equilibrium constant, derived from activities, can be written as the product of a temperature-dependent term and the ratio of concentrations: K=(RT) vIIC i vi . This gives a statistical mechanical basis for the empirical observation that for hydrogen-bonding equilibria, the ratio of concentrations is approximately equal to the ratio of activities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00503864
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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