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  • 1975-1979  (2)
  • Life and Medical Sciences  (1)
  • Polymer and Materials Science  (1)
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  • 1
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Clad Metals for Electrical Engineering. Materials with optimum properties for conducting springs can be produced by cladding a metallic sheat of high electrical conductivity between two sheats of a metal with high stiffness.Using suitable cladding components, thermo bi metals with different electrical resistance can be produced without essential variation of deflection and force. With this it is possible, to use groups of devices with uniform mechanical construction for different currents, which means a good technical as well as economic solution.High prices of noble metal based contact materials have led to the production of contact bimetals some years ago. Inspite of higher production costs these materials can be used very economically.
    Notes: Durch geeignete Anordnung hochfester und hochleitfähiger Komponenten in einem Schichtverbundwerkstoff lassen sich Werkstoffe mit optimalen Eigenschaften für stromführende Federn herstellen. Durch Verwendung geeigneter Plattierungskomponenten können Thermobimetalle mit unterschiedlichem elektrischen Widerstand ohne wesentliche Veränderung der Ausbiegung und der Kraftwirkung hergestellt werden. Somit ist es möglich, Gerätegruppen mit gleichem mechanischen Grundaufbau für verschiedene Stromstärken zu verwenden und damit technisch und wirtschaftlich günstige Problemlösungen zu erzielen.Der hohe Preis der Kontaktwerkstoffe auf Edelmetallbasis führte schon vor vielen Jahren zur Herstellung von Kontaktbimetallen. Trotz höherer Formkosten sind diese Werkstoffe in den meisten Fällen besonders wirtschaftlich einsetzbar.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Cell division, neurite formation and acetylcholinesterase activity were examined in a clone (NBA2) of mouse neuroblastoma cells maintained for up to 120 hours in medium with pH values between 6.6 and 8.0. Growth rate decreased as pH was reduced from 7.8 to 6.6. Generation time at pH 7.4 was 25 hours, while the rate of cell division was negligible at pH 6.6. The total number of cells at stationary phase was less at the lower pH values. Neurite formation was enhanced markedly as the pH was reduced from 7.4 to 6.6. Acetylcholinesterase activity was 5- to 8-fold greater in cells exposed to medium at pH 6.6 than in cells maintained in medium at pH 7.4. The reduction in the rate of cell division and increases in neurite formation and acetylcholinesterase activity at pH 6.6 were reversible upon exposure of the cells to pH 7.4 medium. Cell viability was greater than 90% at all medium pH values over a period of 120 hours. Uncloned T-59 mouse neuroblastoma cells were affected similarly by changes in pH. These results show that manipulation of the environmental pH can reversibly alter growth, neurite formation, and acetylcholinesterase activity of mouse neuroblastoma cells in culture.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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