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  • 1
    Electronic Resource
    Electronic Resource
    A new model for impregnation mechanisms in different GF/PP commingled yarns (1994)
    Springer
    Applied composite materials 1 (1994), S. 351-371 
    Details
    ISSN: 1573-4897
    Keywords: commingled yarn ; impregnation ; consolidation ; thermoplastics ; processing ; permeability ; mechanical testing ; mathematical modelling ; compression moulding ; glass fibre bed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Impregnation mechanisms of different kinds of GF/PP commingled yarns have been studied. As the reinforcing fibres were always the same, a global description has been worked out. Two different mathematical approaches for fibre bed permeability (Kozeny-Carman and Gutowski) were compared. The constants of the applied mathematical models have to stay the same if the fibre reeinforcement and the fibre arrangement is the same. Neither the kind of matrix, nor the fibre volume content may change these constants. Differences in the degree of impregnation after the same process conditions can be only due to different sizes of fibre agglomerations, thus the initial distribution of reinforcing fibres and matrix. For an exact determination of impregnation times and conditions the exact distribution of fibres in the intermediate material and after processing has to be known. This distribution is determined by SEM microscopy and data given from the material supplier. The importance of different process parameters, such as temperature, pressure, processing time is weighted by determining the density and mechanical properties of the specimens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00568041
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  • 2
    Electronic Resource
    Electronic Resource
    Psychosoziale Risiko- und Schutzfaktoren in Kindheit und Jugend als Prädisposition für psychische Störungen im Erwachsenenalter Gegenwärtiger Stand der Forschung (1997)
    Springer
    Der Nervenarzt 68 (1997), S. 683-695 
    Details
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Risikofaktoren ; Schutzfaktoren ; Kindheit ; Vulnerabilität ; Key words Childhood risk factors ; Childhood protective factors ; Vulnerability ; Resilience ; Sexual abuse ; Physical abuse ; Review
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Longitudinal and well-controlled cross-sectional studies have shown that numerous psychosocial stress factors in childhood and youth affect psychic health in the long term. The significance of compensatory protective factors has also been well documented in various studies. An overview of this work is presented: the factors which need to be clarified and taken into consideration in the diagnosis of psychic disorders have been summarized and critically analyzed on the basis of the results of more recent studies of the significance of sexual traumatization.
    Notes: Zusammenfassung Eine ganze Reihe psychosozialer Belastungsfaktoren in Kindheit und Jugend sind heute durch prospektive Longitudinalstudien und gut kontrollierte Querschnittsstudien hinsichtlicher ihrer Langzeitfolgen für die psychische Gesundheit gut gesichert. Auch die Bedeutung kompensatorischer Schutzfaktoren wurde in einer Reihe von Studien gut belegt. Es wird eine Übersicht über diese Studien gegeben: jene Faktoren werden zusammengestellt, die in der Diagnostik psychischer Störungen abgeklärt und in der Therapie berücksichtigt werden sollten. Eine kritische Auseinandersetzung erfolgt auf dem Hintergrund der Ergebnisse neuerer Untersuchungen mit der Bedeutung sexueller Traumatisierungen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001150050183
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cell-suspension culture of Arachis hypogaea L.: model system of specific enzyme induction in secondary metabolism (1987)
    Springer
    Planta 172 (1987), S. 238-244 
    Details
    ISSN: 1432-2048
    Keywords: Arachis ; Cell culture ; Enzyme induction (cell culture) ; Phenylalanine ammonia-lyase ; Phytoalexin ; Stilbene synthase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A peanut (Arachis hypogaea L.) cell-suspension culture susceptible to selective induction of stilbene formation was established. The principles of defense responses of the whole plant were found to be retained in the artificial system. The suspension culture was characterized by its growth curve and by various biochemical parameters. In the stationary phase, reached 8 d after transfer to a new medium, the formation of stilbenes and stilbene synthase could be induced without altering the levels of other enzymes. Eighteen hours after applying an artificial elicitor (ultraviolet-C light) or 4 h after eliciting with a crude preparation of Phytophthora cambivora cell walls, phenylalanineammonia-lyase activity was increased eightfold and stilbene-synthase activity 20-fold. The activity of phenylalanine ammonia-lyase reached its peak at a slightly different time from that of stilbene synthase. The main products of L-phenylalanine metabolism in the induced cells were resveratrol, 3,3′,5-trihydroxy-4′-methoxystilbene and isopentenylresveratrol. Likewise, feruloyl-CoA reductase, as a parameter of lignin formation, was enhanced following induction, albeit with a different time course and with a less steep increase than found for phenylalanine ammonia-lyase and stilbene synthase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394593
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    Paper (German National Licenses)
    Fulltext
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