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  • Alkalische Phosphatase  (1)
  • Dielectric  (1)
  • 1
    ISSN: 1436-6274
    Keywords: Schlüsselwörter ; Mesenchymale Vorläuferzellen ; CFU-F ; Alkalische Phosphatase ; Klonales Wachstum ; Keywords ; Mesenchymal progenitor cells ; CFU-F ; Alkaline phosphatase ; Clonal growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: In 7 patients undergoing corrective surgery of the limbs, cancellous bone was harvested from the iliac crest. During this procedure bone marrow was aspirated. Mononuclear cells were isolated by density gradient centrifugation, and a clonal growth was initiated for CFU-F. Cultures were kept for 2, 3 and ¶4 weeks. In mean 5.6 × 105 mononuclear cells/ml aspirate were isolated. The average clonal efficiency was 4.5 colonies/ml aspirate. As a sign of osteogenic differentiation 15.3% (2 weeks), 42.2% (3 weeks) and 64.3% (4 weeks) of the areas of clonal growth stained positive for alkaline phosphatase. Immunostaining for osteocalcin showed a similar pattern confirming these results. These results suggest that human mesenchymal progenitors can be isolated from marrow punctures and that with matching culture conditions osteogenic differentiation is possible.
    Notes: Bei Spongiosaentnahmen im Rahmen aseptischer Eingriffe wurde bei 7 Patienten ein Knochenmarkaspirat vom vorderen Beckenkamm gewonnen. Die mononukleäre Zellfraktion wurde über Gradientenzentrifugationen isoliert, und die Zellen wurden in Form eines klonalen Wachstums gezüchtet. Die Kulturzeiten betrugen 2,3 und 4 Wochen. Im Mittel ließen sich 5,6 × 10 5 Zellen/ml Aspirat gewinnen. Die klonale Wachstumseffizienz betrug im Durchschnitt 4,5 Kolonien/ml Aspirat. Als Hinweis auf eine osteogene Differenzierung exprimierten nach ¶2 Wochen 15,3%, nach 3 Wochen 42,2% und nach 4 Wochen 64,3% Flächenanteil der Kolonien alkalische Phosphatase. Dieses Ergebnis konnte durch immunzytochemische Färbung auf Osteokalzin bestätigt werden. Die Ergebnisse zeigen, dass humane mesenchymale Vorläuferzellen aus dem Knochenmark isoliert und unter den passenden Kulturbedingungen in die osteogene Reihe differenziert werden können.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 4 (1993), S. 164-171 
    ISSN: 1042-7147
    Keywords: Polyelectrolytes ; Glass transition ; Conductivity ; NMR ; Dielectric ; Relaxation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Ionene glasses are considered as being a new class of materials. Their properties have been investigated in detail by thermoanalytical, solid state NMR, and dielectric techniques. The segmental dynamics of these cationic polyelectrolytes, labeled in chosen positions, have been studied with solid state 2H-NMR. Below the glass transition the quaternized ammonium groups in the polymer backbone are essentially static, due to strong Coulomb interactions. The glass transition in these materials is characterized by the softening of a network formed by the N+-cations. However, both the low molecular weight counterions and the organic chain segments linking the ammonium groups are already mobile below Tg. The dynamics of the organic segments in the glassy state can be described as motion between fixed ends. Ionic conductivity in the glassy state is based on thermally activated anion transport. The influence of the flexibility of the organic chain segments and of the type of the anion on the conductivity are discussed. A simple analytic expression is proposed to describe the conductivity behavior in the low frequency limit.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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