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  • 1985-1989  (5)
  • 1987  (5)
  • Polymer and Materials Science  (4)
  • Multimorbidity  (1)
Material
Years
  • 1985-1989  (5)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 65 (1987), S. 551-557 
    ISSN: 1432-1440
    Keywords: Theophylline ; Age ; Multimorbidity ; Pharmacokinetics ; Pharmacodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The pharmacokinetics of theophylline (200 mg i.v.) were determined in 20 geriatric patients with multiple diseases. Serum concentrations were fitted to an open 2-compartment model. Percent changes in venous pCO2 and pO2 were used as parameters of the pharmacodynamic action. Total clearance was decreased and elimination half-life of theophylline was found to be prolonged in the elderly patients compared with data of a study with young healthy volunteers. The stronger the pharmacodynamic action of theophylline (percent change of venous pCO2 after 30 min), the faster was its elimination and the lower were measured concentrations after 2, 6, and 12 h.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 658-661 
    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: By investigations of the thermal and thermal oxidative behaviour of polycyanurates and their blends with polyglycidethers is demonstrated that polymers prepared from nearly equimolar ratios of cyanate and glycidylether groups show minimum stability, while the pure polycyanurates show maximum stability.
    Notes: Untersuchungen zur thermischen und thermisch-oxidativen Beständigkeit von Polycyanuraten und deren Modifizierungen mit Polyglycidethern zeigten, daß Polymere aus nahezu äquivalenten Anteilen an Cyanat- und Glycidether-Gruppen die geringste und reine Polycyanurate die höchste Stabilität aufweisen.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 393-396 
    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: The electrical properties of polycyanurates and their modifications with polyglycidylether are described. The usefulness of these polymers as excellent electrical insulation materials is demonstrated by two examples.
    Notes: Elektrische Eigenschaften reiner und mit Polyglycidethern modifizierter Polycyanurate werden aufgezeigt. An zwei Beispielen wird der Einstatz von Diandicyanat-Dianbisglycidether-Kombinationen als Elektroisolierstoff beschreieben.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 655-658 
    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: The average bond lengths and bond angles of the structural units of polycyanurates synthesized by polycyclotrimerization of 2,2-bis(4-cyanatophenyl)propane were measured by single crystal X-ray analysis of model compounds. An off-lattice Monte Carlo model was developed for the simulation of the geometrical structure of cyanurate oligomers with polymerization degrees up to 31. Excluded volume effects were taken into account in the form of hard spheres. The calculated results show that an occurrence of intramolecular cyclizations, which was supposed in the literature, is possible.
    Notes: Die Größen der Bindungsabstände und -winkel der in Polycyanuraten auf Basis von 2,2-Bis(4-cyanatophenyl)propan auftretenden Strukturelemente wurden durch Röntgenkristallstrukturanalyse von Modellsubstanzen ermittelt. Darauf aufbauend wurde ein Monte-Carlo off-lattice Modell zur Simulation der geometrischen Struktur auftretender Oligomere bis zu einem Polymerisationsgrad 31 entwickelt, in dem Effekte des ausgeschlossenen Volumens in Form von hard-sphere Potentialen berücksichtigt sind. Die Ergebnisse belegen unter anderem die aus experimentellen Daten resultierende Vermutung des Auftretens intramolekularer Cyclisierungen.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 16-21 
    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: A Monte Carlo model for the simulation of the process of network building by polycyclotrimerization of difunctional monomers basing on the reaction mechanism of the polycyclotrimerization of aromatic dicyanates was developed. The experimental dependences of the average molar mass, the mass fractions of the first oligomers and of the gel fraction on the conversion of functional groups, measured for the reaction of 2, 2-bis(4-cyanatophenyl) propane in bulk, can be well fitted by the model. Furthermore, the possiblities of the simulation of intramolecular cyclizations and substitution effects are discussed.
    Notes: Auf Basis des Reaktionsmechanismus der Polycyclotrimerisierung aromatischer Dicyanate wurde ein Monte-Carlo-Modell zur Simulation der Netwerkbildung durch Polycyclotrimerisierung difunktioneller Monomere entwickelt. Die experimentell ermittelten Abhängigkeiten der mittleren Molmasse, der Massenanteile der ersten Oligomere und des Gelanteils vom Umsatz der funktionellen Gruppen bei der Reaktion von 2, 2-Bis (4-cyanatophenyl) propan in Schmelze werden durch das Modell gut erfaßt. Weiterhin werden Möglichkeiten der Simulation von intramolekularen Cyclisiierungen und Substituenteneffekten diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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