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  • Springer  (7)
  • Annual Reviews
  • 1975-1979  (7)
  • 1960-1964
  • 1979  (7)
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Keywords
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  • 1975-1979  (7)
  • 1960-1964
Year
  • 1
    Electronic Resource
    Electronic Resource
    Influence of trace elements and nitrogen sources on versicolorin production by a mutant strain of Aspergillus parasiticus (1979)
    Springer
    Mycopathologia 69 (1979), S. 161-166 
    Details
    ISSN: 1573-0832
    Keywords: Aspergillus parasiticus ; Furobenzofuran ; Versicolorin A ; Versicolorin C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A mutant strain of Aspergillus parasiticus blocked in aflatoxin biosynthesis accumulates versicolorin A and versicolorin C. The effect of trace elements on the growth and versicolorin production by this strain was studied in a defined medium. The omission of manganese was slightly stimulatory to versicolorin production; when zinc was omitted from the medium, no detectable versicolorins were produced. Experiments on nitrogen sources in a highsucrose medium indicated that fourfold to fivefold increases in versicolorin yields could be obtained by substituting 3 ml/l corn steep liquor or 0.1 M NH4NO3 for the 0.023 M (NH4)2SO3 used previously as the nitrogen source in studies on versicolorin production by this strain. These improved yields will facilitate attempts to accumulate enough versicolorin A and versicolorin C for toxicity and carcinogenicity testing. Chromatographic profiles of mycelial extracts of cultures grown in a defined medium with 0.1 M NH4NO3 as the nitrogen source revealed 2 previously unrecognized compounds. The accumulation of these new metabolites in a mutant blocked in aflatoxin production may indicate that they are biosynthetically related to aflatoxin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00452829
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Unsteady flow of incompressible fluids in deformable tubes (1979)
    Springer
    Acta mechanica 33 (1979), S. 189-197 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Die instationäre, axialsymmetrische Strömung einer inkompressiblen Flüssigkeit in einem deformierbaren Rohr wird betrachetet unter Berücksichtigung von Verlusten und Wandreibung. Im besonderen werden die allgemeinen Bedingungen betrachtet, wobei sich eine Diskontinuität in der Geschwindigkeit des Flüssigkeitsdruckes in eine Druckdiskontinuität entwickelt. Dies kann als abrupter Schub der Rohrwand interpretiert werden und schädlich sein. Das Problem ist auch für die einfachste Situation eines linear elastischen Rohres bei infinitesimalen Deformationen nichtlinear. Das Problem der anfangs stationären Strömung in einem Kreisrohr mit axial veränderlichem Querschnitt wird ebenfalls betrachtet.
    Notes: Summary We investigate the unsteady axially symmetric flow of an incompressible fluid in a deformable tube including the effects of leakage and wall friction. In particular, we consider the general conditions whereby a discontinuity in the fluid pressure rate may develop into a pressure discontinuity, a situation which may be interpreted as an abrupt shear of the tube wall and which could be damaging. The problem is inherently non-linear even for the simplest situation of a linearly elastic tube undergoing infinitesimal deformation. The problem of initial steady flow in a circular tube with axially varying cross section is also considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01175915
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  • 3
    Electronic Resource
    Electronic Resource
    Some properties of curved shock waves in ideal fluid mixtures with multiple temperatures (1979)
    Springer
    Acta mechanica 33 (1979), S. 265-280 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Die Theorie der singulären Flächen wird verwendet zur Betrachtung der Eigenschaften gekrümmter Stoßwellen, die sich in einer Mischung ausbreiten, wobei kombinierte Effekte von Diffusion und verschiedenen Temperaturen auftreten. Es wird gezeigt, wie Diffusion vor dem Stoß einen Spinsprung über dem Stoß, für ebene Stöße, verursacht. Die Analysis enthält Gleichungen, die die evolutionären Eigenschaften der Stoßstärke bestimmen. Diese Gleichungen zeigen, wie die Krümmung, die Bewegung vor dem Stoß, Diffusion und Energieversorgung die Stoßstärke beeinflussen.
    Notes: Summary The theory of singular surfaces is used to investigate the properties of curved shock waves propagating in a mixture where the combined effects of diffusion and multiple temperatures are present. We show how diffusion in front of the shock will cause, even for plane shocks, a spin jump across the shock. Our analysis contains formulas which govern the evolutionary properties of the shock strength. These formulas show how the curvature, motion in front of the shock, diffusion and energy supplies influence the shock strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01202108
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  • 4
    Electronic Resource
    Electronic Resource
    One dimensional dynamic electromechanical constitutive relations of ferroelectric materials (1979)
    Springer
    Acta mechanica 31 (1979), S. 231-241 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Für das dynamische Verhalten eines gepolten, polykristallinen, ferroelektrischen Stoffes wird eine makroskopische Theorie präsentiert, die die gekoppelten elektromechanischen Wechselwirkungen beschreibt. Die Untersuchung ist auf einen idealen Stoff beschränkt, der das einfachste System mit Ferroelektrizität darstellt. Sowohl Änderungen der Stärke der elektrischen Dipole, wie auch der Orientierung der Bereiche sind enthalten. Die Kopplung zwischen den elektrischen und den mechanischen Eigenschaften des Stoffes wird betrachtet, und die Materialgleichungen zur Darstellung des sich ergebenden dynamischen Verhaltens werden linearisiert.
    Notes: Summary We present a macroscopic theory for the dynamic response of a poled polycrystalline ferroelectric material describing its coupled electromechanical interactions. The treatment is restricted to an idealized material representing the simplest system capable of displaying ferroelectricity; it includes changes in both the magnitude of the electric dipoles and the orientation of the domains. Coupling between the electrical and mechanical properties of the material is considered and the constitutive equations are linearized to illustrate the resulting dynamic response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01176851
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  • 5
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    Some properties of curved shock waves in ideal fluid mixtures with multiple temperatures (1979)
    Springer
    Details
    Publication Date: 1979-12-01
    Print ISSN: 0001-5970
    Electronic ISSN: 1619-6937
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 6
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    One dimensional dynamic electromechanical constitutive relations of ferroelectric materials (1979)
    Springer
    Details
    Publication Date: 1979-09-01
    Print ISSN: 0001-5970
    Electronic ISSN: 1619-6937
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 7
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    Unsteady flow of incompressible fluids in deformable tubes (1979)
    Springer
    Details
    Publication Date: 1979-09-01
    Print ISSN: 0001-5970
    Electronic ISSN: 1619-6937
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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