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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 149 (1990), S. 560-564 
    ISSN: 1432-1076
    Keywords: Acute mastoiditis ; Subperiosteal abscess ; Central nervous system ; Microbiology ; Treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The charts of 73 children (31 girls, 42 boys) aged 4 months to 14 years (mean 4.5 years) with acute mastoiditis managed during a 16-year period were reviewed. Of the patients 36% were less than 24 months old. Retro-auricular swelling was described in 63 of the 73 children, tenderness in 59, erythema in 58, and protrusion of the auricle in 45. A pathological tympanic membrane was noted in 33% of the patients and fever in only 29%. Apart from local inflammation, the most frequent complaints and symptoms were otalgia (n=42), recent upper respiratory tract infections (n=22), and fever alone (n=22). A subperiosteal abscess was found in 36 patients, and CNS involvement in 5. Nearly half of the patients (48%) were on antibiotic therapy at admission. The isolation rates in bacterial cultures from subperiosteal aspirates (81%) and from mastoid mucosa (68%) were considerably higher than from blood cultures (14%) and were not influenced by previously administered antibiotics. Pneumococci (9/32) andStaphylococcus epidermidis (6/32) were the agents most often isolated. The incidence of the bacteria isolated from patients pre-treated with antibiotics differed from the incidence in patients not previously treated. In 24 patients (33%) the lesion healed with antibiotic therapy without mastoid surgery. Myringotomy and the insertion of a ventilation tube is indicated initially, if acute otitis media with effusion is found. In the absence of a subperiosteal abscess and of CNS involvement, a 48-hour trial of intravenous antibiotic therapy, directed also against staphylococci, is justified before mastoid surgery is considered.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 230 (1885), S. 50-55 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 151-156 
    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: Flow and relaxation in condensed matter, mainly in polymer systems are realized by molecular dislocations. The loosening of the structure at the second order transition point causes the place exchange processes in flow direction to be more easy. The few possibilities for rearrangement at the beginning of the softening allow noticeable deformations only if the exchange processes are cooperative. These processes are described by systems of differential equations, which can be solved by means of an analogous computer.
    Notes: Fließen und Relaxation in kondensierten Phasen, z. B. in erweichenden polymeren Systemen, beruhen auf molekularen Umlagerungen. Die am Glaspunkt beginnende Auflockerung der Struktur erleichtert die Platzwechselvorgänge in Fließrichtung. Die bei Beginnen der Erweichung bestehenden wenigen molekularen Umlagerungsmöglichkeiten erlauben nur dann merkliche Deformationen, wenn die Platzwechsel miteinander gekoppelt sind. Diese Prozesse werden durch Systeme gekoppelter linearer Differentialgleichungen beschrieben, die mit einem Hybridrechner gelöst und graphisch ausgewertet werden.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 29 (1965), S. 113-122 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,3-Dichlorpropen reagiert mit Ammoniak in wäßrig-alkoholischer Lösung unter Bildung des primären, sekundären und tertiären Chlorpropenylamins sowie des quaternären Ammoniumsalzes. Die mengenmäßige Zusammensetzung hängt vom Molverhältnis 1,3-Dichlorpropen/Ammoniak ab. Kinetische Untersuchungen bei 50°C ergaben, daß alle 4 Teilreaktionen der Reaktionsfolge nach Zeitgesetzen 2. Ordnung verlaufen. Die Geschwindigkeitskonstanten wurden durch ein numerisches Iterationsverfahren ermittelt; sie hängen ab von der Chlorionenkonzentration und der Konzentration der basischen Komponenten des Systems. Ammoniak reagiert mit Dichlorpropen etwa 10mal langsamer als die Chlorpropenylamine. Die Ergebnisse sprechen für einen SN2-Mechanismus.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 606-612 
    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 high elastic deformation of rubber is described by means of coupled molecular displacements in the direction of external stress. It appears a superposition of an elastic potential A caused by shearing forces and an intermolecular potential U given by chemical bonding forces. This leads to a disturbance of the thermodynamic equilibrium. As the molecular displacements are coupled we have to solve a system of eqations. With a function of the type A = C3σ + C4σ2 (σ-stress) the experimentally found dependence between stress and strain is best described. The most noteworthy result of the theory is the explanation of the saturation of deformation with growing stress and a S-like curvature for low stresses in the stress-strain relation.
    Notes: Die kautschukelastische Verformung wird auf der Basis gekoppelter molekularer Umlagerungen in Richtung der äußeren Spannung betrachtet. Es tritt eine Überlagerung eines elastischen Potentials A, das durch Scherkräfte verursacht wird, und eines intermolekularen Potentials U, das durch die chemischen Bindungskräfte gegeben ist, auf. Dies führt zu einer Störung des thermodynamischen Gleichgewichtes. Da die molekularen Umlagerungen gekoppelt sind, muß ein System von Gleichungen gelöst werden. Mit einer Funktion der Art A = C3σ + C4σ2 (σ-Spannung) wird der experimentell gefundene Zusammenhang zwischen Spannung und Dehnung am besten wiedergegeben. Das bemerkenswerteste Ergebnis der Theorie ist die Deutung der Sättigung der Deformation bei wachsender Spannung und eine S-förmige Krümmung der Spannungsdehnungskurve im Anfangsbereich.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 31 (1898), S. 1826-1828 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 18 (1885), S. 1333-1336 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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