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  • 1
    ISSN: 0168-9452
    Keywords: fluorescence ; magnesium effects ; oxyfluorfen ; photochemical activity
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Plant Science 63 (1989), S. 1-6 
    ISSN: 0168-9452
    Keywords: diphenylether herbicides ; inhibitor constant ; photosystem II photochemistry ; spinach chloroplasts
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Polyhedron 7 (1988), S. 709-714 
    ISSN: 0277-5387
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0630
    Keywords: 72.20. Jv ; 72.40. + W
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The effect of a preliminary illumination on the amount of polarization generated in the subsequently dark-polarized Kapton-H samples has been investigated by using the uv and visible radiations as an excitation source. The magnitude of this effect is governed by the two excitation parameters, viz. duration of the illumination (t ex) and the time interval (Δt) between the end of illumination and the outset of the polarizing electric field. A rise in the operating temperature makes the appearance of the phenomenon more pronounced. The uv radiation has been found more efficient than the visible one for producing the excitation effect.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 35 (1984), S. 267-270 
    ISSN: 1432-0630
    Keywords: 72.20-Jv ; 72.40.+W
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The photoinduced polarization in Kapton-H thin film has been studied by analysing the isothermal dark decay characteristics of photo- and dark-polarized specimens for different values of the polarizing parameters. The total polarization induced has been found to increase continuously with polarizing temperature but with polarizing field, it approaches a saturation. The behaviour of dark decay currents for photo and dark polarized identical samples changes with operating temperature. The phenomenon is explained in terms of the shift of electrons and hole demarcation levels under variation of temperature and illumination intensity.
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  • 6
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-069X
    Keywords: Proopiomelanocortin ; Immune neuroendocrine network ; Cytokines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Proopiomelanocortin (POMC) is known to be synthesized in the pituitary gland and is subsequently cleaved by specific prohormone convertases into biologically active peptide hormones such as melanocyte stimulating hormones (MSH), adrenocorticotropin (ACTH) and endorphins (EP). Guanine nucleotide-binding protein (G-protein)-coupled receptors, which have only recently been discovered, are involved in the transmission of their message. There is also evidence indicating that POMC is not only produced by pituitary cells but is an ubiquitous molecule, that is cleaved cell- and tissue-specific. It has also been shown that the epidermis keratinocytes as well as melanocytes express POMC upon stimulation and release αMSH and ACTH. In addition to their function as hormones, POMC peptides have been shown to exert a variety of immunoregulatory effects by modulating the function of immunocompetent cells as well as cytokines. These findings provide further evidence for the immunoneuroendocrine network playing a crucial role during the pathogenesis of immune and inflammatory skin disease.
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  • 8
    ISSN: 1248-9204
    Keywords: Collagen I ; Collagen III ; Hernia ; Fascia transversalis ; Surgical mesh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The aim of this study was to substantiate the hypothesis as to whether an altered metabolism of type I and type III collagen should be included as pathophysiological considerations of inguinal hernia development or not. Therefore, fascia transversalis derived from patients with indirect hernias (n=9), direct hernias (n=7) and from controls (n=7) were investigated both by immunohistochemistry and protein analysis (Western Blot). Both immunohistochemical analysis and Western Blot analysis showed that the ratio of the relative amounts of type I to type III collagen was significantly decreased in the fascia transversalis of patients with indirect and direct inguinal hernias compared with controls (p〈0.001). The relative reduction of the collagen I/III ratio may be explained by a concomitant increase in collagen type III synthesis in both hernia-families. In contrast to the control group there was no significant difference between patients with direct and indirect hernia. It is concluded that the change in collagen type I / III ratio, with the resulting altered physical properties, might essentially predispose individuals to the development of inguinal hernia. Thus, an altered collagen metabolism would provide an additional theoretical basis for the use of alloplastic materials, such as surgical meshes, and an explanation for the disappointing high recurrence rates after appropriate primary hernia repair, particularly if mesh-free techniques have been used.
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  • 9
    ISSN: 1573-7438
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Des investigations sérologiques par la méthode de l'agglutination indirecte pour rechercher des anticorps toxoplasmiques ont été faites sur un troupeau de chèvres laitières. Des anticorps ont été mis en évidence chez 34 p.100 des 371 animaux apparemment sains à des titres allant de 1:4 à 1:1024. Des titres élevés d'anticorps atteignant 1:256 ont été relevés chez 18 (soit 4,9 p.100) des animaux comprenant 13 chèvres, ce qui fait penser à une infection récente. L'existence de nombre d'avortements non-brucelliques associés avec des titres sérologiques élevés et l'isolement du parasite des tittus cérébraux d'un foetus avorté suggerent que les Toxoplasmes en ont probablement été le facteur étiologique. Des sérums ayant des taux significativement élevés d'anticorps agglutinants (1:128) ont également été reconnus comme positifs par le test d'agglutination en EAT. Les aspects épidémiologiques et le danger potentiel pour l'homme de ces cas subcliniques de toxoplasmose chez les chèvres laitières sont discutés.
    Abstract: Resumen Se realizaron investigaciones serológicas de toxoplasmosis mediante la prueba indirecta de hemaglutinación en un rebaño de cabras lecheras. Se encontraron títulos de 1:4 a 1:1024 en 34% de 371 animales aparentemente sanos. Títulos de 1:256 sugestivos de infecciones recientes, se encontraron en 18 (4.9%) animales, incluyendo 13 hembras paridas. La ocurrencia de un significativo número de abortos no asociados con brucela, títulos serológicos altos de toxoplasmosis y el aislamiento del parásito del cerebro de fetos abortados, sugiere que eltoxoplasma es el factor etiológico más importante. Se discuten aspectos epidemiológicos de importantcia para la salud pública, relacionados con el potencial de la toxoplasmosis (subclínica) en cabras lecheras.
    Notes: Summary Serological investigation by the indirect haemagglutination test forToxoplasma antibodies was carried out in a flock of dairy goats. Antibody titres ranging from 1:4 to 1:1,024 were found in 34% of 371 apparently healthy animals. High antibody titres of 1:256 suggestive of recent infection were noted in 18 (4.9%) animals including 13 nannies. The occurrence of a number of non-brucella abortions associated with high serological titres and the isolation of the parasite from the brain tissues of an aborted foetus suggestedToxoplasma as a probable aetiologic factor. Sera having significant levels of haemagglutinating antibodies (≥1:128) were also found positive to the card agglutination test. Epidemiological aspects and the public health potential of subclinical toxoplasmosis in dairy goats are discussed.
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  • 10
    ISSN: 1573-7438
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
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