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  • Wiley-Blackwell  (2)
  • Molecular Diversity Preservation International
  • 1980-1984  (2)
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Publisher
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  • 1
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Aqueous dispersion of nearly monodisperse charged polymer spheres of 250 nm diameter have been investigated in steady and oszillatory shear flow. Polydisperse latices were included for comparison. By using different types of rotational rheometers and a capillary viscometer viscosity measurements could be performed over a shear stress range from 10-3 Pa to 105 Pa.At shear stresses below 10-2 Pa the viscosity is independent of the shear rate but strongly increases with qrowing volume fraction φ. In the stress range of 0.1 to 10 Pa a transition to a lower viscosity level is observed. For φ≲0.2 this transition is negligible and the dispersion behaves Newtonian. The viscosity decrease (shear-thinning behaviour) becomes significant at higher volume fractions and reaches a magnitude of more than 3 decades for φ = 0.50. Polydispersity increases the viscosity level at small stresses. The latter is also increased by growing particle charge (higher pH-value) but reduced by the addition of NaCl (screening of the charge). For volume fractions φ ≲0.4 shear-thickening is found up to a viscosity maximum. The maqnitude of shear-thickening can be reduced by addition of NaOH (increase of particle charge) and broadening of the particle size distribution.The concentrated dispersions behave viscoelastic. They show an instantanious elastic deformation at the onset of shear creep tests and exhibit recoverable strains after unloading. In oscillatory shear the storage modulus approaches a constant value with decreasing angular frequency indicating the formation of a three-dimensional lattice structure.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese von Desoxyoligonucleotid-Fragmenten zur Anwendung in der Genverknüpfung unter Einsatz verbesserter präparativer und analytischer MethodenZur Untersuchung der Expression rekombinanter DNS haben wir Oligonucleotide als Genverknüpfungsfragmente dargestellt, die spezifische Spaltstellen sowohl in die DNA wie in das zugehörige Protein einführen. Ihr Aufbau ist so, daß die Spaltung eines Fusionsproteins entweder durch Bromcyan oder durch Kollagenase erfolgen kann. Die Synthese wurde nach dem Triesterschema durchgeführt, wobei schnellere und einfachere Wege zu funktionalisierten Dinucleotid-Baueinheiten entwickelt wurden. Die Felddesorptions-Massenspektrometrie diente als Routine-methode für den Strukturbeweis und die Reinheitskontrolle dieser Baueinheiten.
    Notes: For studies on the expression of recombinant DNA, linker fragments have been prepared which serve to introduce specific points of cleavage on the DNA as well as the protein level. Such linkers were designed for cyanogen bromide as well as for collagenase cleavage of fused proteins. The preparation was done according to the triester synthesis scheme using improved and simpler routes to functionalized dinucleotide building blocks. Field desorption mass spectrometry was used as a routine tool for the identification and control of the purity of these units.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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