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  • 1
    Electronic Resource
    Electronic Resource
    Selective and non-selective sampling from precolumn separations - with emphasis on the sampling of aqueous solutionsPaper based on a poster presented at the Fifth International Symposium on Capillary Chromatography, Riva del Garda, Italy, April 26-28, 1983. (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 4-12 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Immobilized capillary columns ; Aqueous solutions ; On-column injection ; Split injection ; Multidimensional separations ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Various methods of gas chromatographic analysis at high resolution and low detection limits in aqueous solutions are described with regard to sampling techniques, column technology, and the application of coupled pre-columns, also including multidimensional methods. Immobilized polyethylene glycol (Carbowax 20 M) columns have also been produced and used successfully.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240070102
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  • 2
    Electronic Resource
    Electronic Resource
    Zetapotentialmessungen in der Papierindustrie - Neuere Meßmethoden und AnwendungenVortrag auf dem Symposium „Elektrokinetische Erscheinungen“ am 8. und 9. November 1979 in Dresden/DDR (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 504-509 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: At first a short review is given with respect to an automatic streaming potential measurement and to the ultrasonic vibration potential method. The ultrasonic vibration method has advantages but the main barrier to a direct application in a mill is the influence of a great electrlyte cocentration. A solution of this problem is of interest. Useful applications of this method in the laboratory are described: basic research with ionic polymers, measurements to the influence of disturbing substances, filler preflocculation.
    Notes: Zunächst wird der Stand der Entwicklung für eine automatische Strömungspotential-Appartur und eine praxisgerechte Ultraschall-Elektrophorese-Apparatur geschildert. Bei der zweiten Methode erschwert hoher Elektrolytgehalt die Anwendung an einer Papiermaschine. Mögliche Auswege werden noch erprobt. Im Labor hat diese Methode jedoch schon vielfältige Anwendungen ermöglicht, wie z. B. bei Untersuchungen über die Wirkungsweise von Retentionsmitteln, den Einfluß von Störsubstanzen und die Füllstoff-Aktivierung.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010310807
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  • 3
    Electronic Resource
    Electronic Resource
    Coherent anti-stokes raman spectra of isoalloxazines (1983)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 14 (1983), S. 106-117 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Coherent anti-Stokes Raman spectra (1700-1100 cm-1) of 7,8-dimethyl-10-tetraacetylisoalloxazine (tetracetylriboflavin) in chloroform and several other solvents of higher polarity and proton availability are reported. Solvent polarity has no influence on either the intensities or frequencies of the Raman modes, whereas the influence of protic solvents is more marked. As well as altering the effective mass of the particular atoms in the isoalloxazine involved, hydrogen bonding is known to change the bond hybridization throughout the entire ring system. A similarly mild electronic perturbation can be produced by changing the methyl substitution on the benzene subnucleus of the isoalloxazine, and this is shown to produce significant changes in the Raman spectrum. Isotopic substitution with 13C and 15N is used to mimic the effective mass changes that would occur on hydrogen bonding. For the model compounds in chloroform, the effect of isotopic substitution on some modes is different from that reported for the same substitution in riboflavin bound to riboflavin binding protein. Frequencies of the prominent bands in all spectra were determined by lineshape analysis. On the basis of these results a tentative interpretation is made of the changes that occur in the Raman spectra of flavins when they bind to flavoproteins.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250140211
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