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  • ATOMIC AND MOLECULAR PHYSICS  (1)
  • Clinical dextran  (1)
  • 1990-1994
  • 1975-1979  (2)
  • 1965-1969
  • 1925-1929
  • 1979  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Quality control of clinical dextran by rapid gel-permeation chromatography (1979)
    Springer
    Chromatographia 12 (1979), S. 155-159 
    Details
    ISSN: 1612-1112
    Keywords: Clinical dextran ; Rapid GPC ; Molecular weight distribution ; Schulz-Zimm distribution ; Hydroxyethyl starch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Clinical dextran can be fractionated by rapid gel-permeation chromatography on SpheronR with the aid of a high-performance liquid chromatograph. The linear calibration function is obtained by dextran fractions whose molecular weights Mw and Mn are determined by absolute methods (light scattering, membrane osmometry) and end group analysis. The transformation of elution diagrams into a molecular weight distribution is described. Characteristic data for dextran 40 and 70 were obtained from the integral distribution curves. The molecular weight distribution of dextran fractions was found to fit a Schulz-Zimm distribution which is typical for long chain polymers. For quality control purposes clinical dextran can be characterized by its molecular weight distribution with high accuracy within one hour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02314870
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    Paper (German National Licenses)
    Fulltext
  • 2
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    The dispersed fluorescence spectrum of NaAr - Ground and excited state potential curves (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Potential curves for the ground state and the first excited state of NaAr were determined. The van der Waals molecule NaAr was prepared by supersonic free jet expansion of a mixture of sodium, argon, and helium. The electronic transition from the ground state to the first excited state A2pi was excited by a tunable dye laser and the resulting fluorescence was studied. The dispersed fluorescence spectra show discrete and diffuse features, corresponding to transitions from excited vibrational levels of the A state to bound and unbound levels of the x state. The characteristic reflection structure in the bound-free spectra permits an unambiguous assignment of the vibrational numbering in the A state, and this assignment together with previously measured spectroscopic constants are used to calculate the potential curve of the A state. The discrete structure in the fluorescence spectra is used to determine the potential curve of the x state in the well region, and the repulsive part of the X curve is then deduced through trial-and-error simulation of the bound-free spectra.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 71; Aug. 1
    Format: text
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    NASA TECHNICAL REPORTS
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