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  • 1970-1974  (4)
  • Polymer and Materials Science  (3)
  • Ventricular elastance  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 12 (1974), S. 664-674 
    ISSN: 1741-0444
    Keywords: Neuromuscular transmission ; Ventricular elastance ; Inotropic state
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire Un modèle de la fonction des terminaisons nerveuses sympathiques des tissue ventriculaires a été développé par analogie avec les différentes fonctions neuromusculaires et interneuronnaires. Le modèle caractérise la jonction neuromusculaire ventriculaire par deux sous-systèmes: un mécanisme de libération neurotransmettrice produit la concentration noradrenalineNE(t) selon un comportement global régulier imitant les données de Rosenbleuth (1932), et une réponse dynamique réalistique à la fréquence des stimulations multiplesf s. Dans cette étude, le principe de la contraction ventriculaire se base sur l'extension du modèle fonctionnel existant de la mécanique ventriculaire du coeur dépouillé de ses nerfs (Greene et al., 1973) à la considération de divers états d'intervention inotropique positive. En tout, cette étude a eu pour résultat la création d'un modèle de la mécanique ventriculaire qui reflète les changements d'état inotropique, de volume diastolique final et de durée.
    Abstract: Zusammenfassung Es wurde ein Modell der Funktion sympathischer Nervenenden im ventrikulären Gewebe durch Analogie mit verschiedenen endoneuralen und neuromuskulären Verbindungen entwickelt. Das Modell zeigt die ventrikuläre neuromuskuläre Verbindung anhand von zwei Systemgruppen—einem Auslösemechanismus für die Nerveübertragung und einem ventrikulären Kontraktionsmechanismus. Die Leistung des Auslösemechanismus der Übertragung ist die Noradrenalinkonzentration NE(t) in kompaktem Festkörperverhalten, die die Daten von Rosenbleuth (1932) und eine realistische dynamische Reaktion auf mehrfache Frequenzstimulif s nachahmt. In dieser Untersuchung basiert der ventrikuläre Kontraktionsmechanismus auf einer Erweiterung eines bestehenden Funktionsmodells der ventrikulären Mechanik eines Herzens mit ausgeschalteter Nervenzufuhr (Greene u.a., 1973) zur Berücksichtigung verschiedener Zustände inotroper Intervention. Insgesamt ergibt sich aus dieser Untersuchung das Modell einer ventrikulären Mechanik, die die Änderungen im inotropen Zustand, im enddiastolischen Volumen (Vorbelastung) und in der Zeit widerspiegelt.
    Notes: Abstract A mathematical model of the function of sympathetic neural terminations in ventricular tissue is developed by analogy with various interneural and neuromuscular juctions. The model characterises the ventricular neuromuscular junction in terms of two subsystems—a neurotransmitter release mechanism and a ventricular contraction mechanism. The output of the transmitter release mechanism is the noradrenaline concentrationNE(t) in a lumped steady-state behaviour that mimics the data of Rosenbleuth (1932) and a realistic dynamic response to multiple stimuli of frequencyf s. The ventricular contraction mechanism in this study is based on an extension of an existing functional model of ventricular mechanics for the denervated heart (Greeneet al., 1973) to a consideration of various states of positive inotropic intervention. Overall, this study results in a model of ventricular mechanics that reflects changes in inotropic state, end-diastolic volume (preload) and time.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 14 (1970), S. 1-9 
    ISSN: 0021-8995
    Keywords: 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 , Physics
    Notes: Dissolution of sulfur-cured, carbon black-loaded copolymers and their blends with cis-1,4-polybutadiene (PBD) are brought about by boiling with o-dichlorobenzene which contains a small amount of 2,2′-dibenzamidodiphenyl disulfide. The resulting slurries are subjected to a sequence of separations which include high-speed centrifugation to remove solids, and solvent precipitation followed by filtration to isolate the precipitates. The precipitates are washed with solvent to remove soluble organic materials followed by carbon disulfide washing to dissolve the polymers. Cast films of the polymers are obtained by evaporating the carbon disulfide washings onto sodium chloride discs. The infrared spectra of the cast films of these preparations are very similar to those of their respective polymers prior to loading and curing. Calculations for relative concentrations of bound styrene and PBD microstructures permit nominal identification of the kinds of styrene-butadiene rubber and the amounts of cis-1,4-PBD used in a cured rubber formulation. Absorption bands used are near 3.35 μ for cis-1,4-PBD, 6.65μ for bound styrene, 10.35 μ for trans-1,4-PBD; and 11.0 μ for vinyl-1,2-PBD. Efforts are being made to improve the data by using a grafting infrared instrument and also to extend the calibrations to include other rubber blends.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 925-928 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 9 (1971), S. 49-53 
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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