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  • 1
    Electronic Resource
    Electronic Resource
    Rhythmische Änderungen der Reaktion auf verschiedene olfaktorische Reize beim Krallenfrosch (Xenopus laevis) (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 449-450 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The behavioural response ofXenopus laevis to olfactory cues shows different rhythmical oscillations which do not depend on the chemical nature and the concentration of the stimulus itself. Habituation to such cues occurs very slowly, pointing to their special importance in the feeding behaviour of this species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02026372
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Quantitative phase-analysis by the Rietveld method using X-ray powder diffraction data : application to the study of alteration halos associated with volcanic-rock-hosted massive sulfide deposits (2001)
    Mineralogical Association of Canada
    In:  The Canadian Mineralogist, 39 . pp. 1617-1633.
    Details
    Publication Date: 2020-05-11
    Description: Quantitative determination of the mineralogical composition of hydrothermally altered rocks was performed by means of the Rietveld method using X-ray powder-diffraction data. Initially, experiments were carried out to minimize systematic errors arising from preferred orientation of particles as well as micro-absorption. The precision of the proposed method was tested by independent replicate sample-preparation and analyses. The closeness of the replicate phase-determinations showed that random within-laboratory errors were comparatively small. Expressed as chemical compositions, the quantitative results are in good agreement with the major oxide concentrations determined by X-ray fluorescence. The results indicate that the relative abundances of phases and refined element substitutions were accurately determined. The method developed was applied to hydrothermally altered rocks from the Waterloo volcanic-rock-hosted massive sulfide (VHMS) deposit in Queensland, Australia. Hierarchical cluster analysis led to the discrimination of several mineralogically distinct alteration-induced assemblages. These mineral assemblages are characteristic of specific zones of alteration. The strong spatial zoning with respect to the mineralized body and the distinct mineralogical assemblages of the alteration halo are interpreted to result primarily from varying degrees of hydrolytic decomposition and potassium metasomatism of the wallrocks. Based on these results, we suggest that quantitative phase-analysis by the proposed method represents a new powerful tool in studies of alteration halos.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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