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  • 1
    Electronic Resource
    Electronic Resource
    Eine neue Methode zur Bestimmung von Periodenlängen (1972)
    Springer
    Pflügers Archiv 336 (1972), S. 60-71 
    Details
    ISSN: 1432-2013
    Keywords: Computing of Period Lengths ; Circadian Rhythm ; Carabidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary If the means of a period τ, determined according to the method of Lamprecht and Weber (1970), are subtracted from each individual value in the corresponding series of measurements, positive and negative differences are obtained, which still exhibit periods independent of τ. By carrying out this elimination procedure repeatedly, one may determine all independent periodicities in a series of measurements or, respectively, one may recognize a dependency of periodicities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00589142
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Direct determination of Benzo[a]pyrene in oil distillates by on-line two-dimensional HPLC with column switching (1992)
    Springer
    Chromatographia 34 (1992), S. 376-380 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Column switching ; Polycyclic aromatics ; Oil distillates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A selective and sensitive HPLC method for the determination of Benzo[a]pyrene (B[a]p) in oil fractions by means of column switching is described. The diluted oil samples were injected directly onto a silica column with isooctane as eluent. After fast elution of the main part of the sample matrix, the B[a]p containing fraction was transferred on-line to a dinitro-aryl-modified silica column for final separation with isooctane/tetrahydrofuran. A detection limit of 50 ppt B[a]p was found when using fluorescence detection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268371
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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