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  • Articles  (2)
  • European Pollen Information  (1)
  • Gonadotrops  (1)
  • Chemistry
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  • Liquid chromatography
  • Magnetism
  • Seismology
  • 2000-2004  (1)
  • 1980-1984  (1)
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  • 1983  (1)
  • 1943
  • Biology  (2)
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  • 2000-2004  (1)
  • 1980-1984  (1)
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  • 1940-1944
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 233 (1983), S. 377-388 
    ISSN: 1432-0878
    Keywords: Gonadotrops ; Gonadotropin secretion ; Steroids ; Brain-pituitary-gonadal axis ; Juvenile teleost
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In a cytophysiological study it was investigated whether in juvenile trout gonadal steroids stimulate the gonadotropic (GTH)-cells directly or indirectly via the brain. Pituitaries of donor animals were transplanted into the caudal musculature of testosterone-treated and non-testosterone-treated host fish. Testosterone treatment caused an increase in GTH-content in the in situ pituitaries and in the grafts. Accordingly, the gonadotrops displayed ultrastructural changes such as the appearance of well-developed Golgi systems and large globules. The stimulation of the morphological development of gonadotrops and of synthesis and storage of GTH in the allografted pituitaries indicates that testosterone affects the GTH-cells directly. In untreated juvenile trout the gonadotropin content of the pituitary and the gonadotropin concentration in the plasma vary with the time of year. This variation and the role of testosterone and gonadotropin-releasing hormone on the release of GTH are discussed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-3025
    Keywords: aerobiology ; airborne pollen ; Europe ; European Pollen Information ; Grass Pollen seasons ; Phenology ; start dates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Geographical and temporal variations in the start dates of grass pollen seasons are described for selected sites of the European Pollen Information Service. Daily average grass pollen counts are derived from Network sites in Finland, the Netherlands, Denmark, United Kingdom, Austria, Italy and Spain, giving a broad longitudinal transect over Western Europe. The study is part of a larger project that also examines annual and regional variations in the severity, timing of the peak and duration of the grass pollen seasons. For several sites, data are available for over twenty years enabling long term trends to be discerned. The analyses show notable contrasts in the progression of the seasons annually with differing lag times occurring between southern and northern sites in various years depending on the weather conditions. The patterns identified provide some insight into geographical differences and temporal trends in the incidence of pollinosis. The paper discusses the main difficulties involved in this type of analysis and notes possibilities for using data from the European Pollen Information service to construct pan European predictive models for pollen seasons.
    Type of Medium: Electronic Resource
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