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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 46 (1974), S. 477-480 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 66 (2005), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The identification of five stages for female and two stages for male eels Anguilla anguilla using multivariate analysis was carried out on a large sample of individuals collected at six different locations in France. Stages corresponded to a growth phase (stages I and II), a pre-migrant phase (III) and two migrating phases (IV and V). It is likely that an important period of growth triggered silvering through the production of growth hormone (GH) in stage III eels. In migrating eels gonad development, gonadotropin hormone (GTH-II) production and increase of eye surface were similar at all sites. Differences among locations were found in gut regression and pectoral fin length. As variability for these increased with the size of the watershed and values were highest for the most downstream locations, fin length and gut regression may indicate the time since an eel started its migration.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The gonadosomatic indices (IG) of female conger eel Conger conger, aged between 2 and 11 years postmetamorphosis, ranged between 0·04 and 4·78 and were correlated with both age and body length. Microscopical examination of the gonads showed immature ovaries at two main stages of oocyte development, pre-vitellogenic oocytes for IG 〈 1, and oocytes at an early vitellogenic stage (lipid vesicle stage) for IG〉1. The immaturity of the conger eels sampled in Concarneau Bay indicates that this species probably spawns in deeper oceanic waters. Radioimmunoassays (RIA) of sex steroids gave low serum levels of oestradiol and of 11-ketotestosterone, but higher levels of testosterone correlated with increase in IG. Immunoenzymatic assay (ELISA) indicated low serum levels of vitellogenin (VtG), which were significantly correlated with IG. The pre-vitellogenic and early vitellogenic stages observed in the coastal C. conger were similar to the oocyte stages found in the European eel Anguilla anguilla, at the yellow and silver phases of its life cycle respectively. However, other morpho-functional changes, associated with silvering in Anguilla species, such as the increase in ocular index, and regression of the digestive tract, did not occur at the early vitellogenic stage in conger eels.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 15 (1999), S. 0 
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 348 (1969), S. 117-130 
    ISSN: 1432-2307
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Two biopsies of lung diagnosed as D.I.P. were studied by electrom microscopy to ascertain the type of cells lining the alveoli and of those lying free in the alveolar spaces. The alveoli were lined predominantly by granular pneumocytes that were P.A.S.-negative after diastase digestion. In contrast, the free intraluminal cells were mostly phagocytic pneumocytes mixed with desquamated granular pneumocytes and were diastase resistant P.A.S.-positive. Sometimes the phagocytic pneumocytes were joined by intertwining pseudopodial-like processes. In addition to that dual cellular reaction (hyperplasia and desquamation of granular pneumocytes, with groups of phagocytic pneumocytes in the alveolar spaces), there were ultrastructural changes in capillaries and infiltrates of lymphocytes, plasma cells and eosinophils in the interstitial tissue of the alveolar wall. We believe that these alterations in the blood-air barrier are one of the factors responsible for the reduced pulmonary diffusing capacity recorded in the two cases presented.
    Notes: Zusammenfassung Zwei als diffuse interstitielle Pneumonie (D.I.P.) diagnostizierte Lungenbiopsien wurden elektronenmikroskopisch untersucht zwecks Bestimmung der die Alveolarwand bekleidenden und der frei im Alveolarraum liegenden Zellen. Die Alveolarwände waren vorwiegend mit granulären Pneumocyten besetzt. Diese waren nach Diastaseein wirkung PAS-negativ. Die frei im Alveolarraum liegenden Zellen waren hauptsächlich Diastase-resistente, PAS-positive phagocytäre Pneumocyten, untermischt mit abgelösten granulären Pneumocyten. Manchmal waren die phagocytären Pneumocyten durch verflochtene pseudopodienartige Fortsätze miteinander verbunden. Außer der zweifachen Zellreaktion (Hyperplasie und Ablösung von granulären Pneumocyten, Gruppen von phagocytären Pneumocyten in den Alveolarräumen), waren feinstrukturelle Veränderungen an den Capillaren nachweisbar sowie lymphocytäre, plasmacytäre und eosinophile Infiltrate im interstitiellen Gewebe der Alveolarwände. Die dadurch hervorgerufene Verbreiterung der Blut-Luftschranke scheint einer der für die in beiden Fällen nachgewiesene verringerte Lungendiffusionskapazität verantwortlichen Faktoren zu sein.
    Type of Medium: Electronic Resource
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