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  • 1975-1979  (2)
  • 1965-1969
  • Factor analysis of correspondences  (1)
  • Isolated right atria  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 293 (1976), S. 81-87 
    ISSN: 1432-1912
    Keywords: Supersensitivity ; Diastolic potential ; Perfused hearts ; Isolated right atria ; Norepinephrine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary It has previously been suggested that the reserpine-induced nonspecific increase in sensitivity of the guinea-pig heart to the chronotropic effect of drugs occurs as a result of an alteration in the electrophysiological properties of the cell membrane. The results obtained in the present study provide support for this suggestion. The diastolic potential of atrial cells of perfused hearts obtained from guinea pigs treated with reserpine (0.1 mg/kg/day) for 7 days was significantly less than control. This treatment schedule of reserpine results in a significant increase in the sensitivity of perfused hearts to the chronotropic effects of drugs. Treatment of animals with reserpine (0.1 mg/kg/day) for only 3 days does not increase the sensitivity of the perfused hearts and does not produce a significant change in the diastolic potential. Under appropriate experimental conditions, isolated spontaneously-beating right atria from chronically reserpine-treated guinea-pigs exhibit supersensitivity. Under the same conditions, there is a significant reduction in the membrane potential of atrial cells. Under conditions in which supersensitivity cannot be demonstrated in isolated right atria, there is no significant change in diastolic potential. These findings suggest that the reserpine-induced enhanced sensitivity of the myocardium to the rate-increasing effects of drugs may be a function of an altered membrane potential.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Plant ecology 40 (1979), S. 115-123 
    ISSN: 1573-5052
    Keywords: Data-processing ; Ecothèque ; Factor analysis of correspondences ; Phytosoclology ; Salt marsh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary An organization for data-processing in phyto-sociology and plant ccology is deseribed. A good preparation by means of standard sheets for collecting and codifying information from the field is emphasized (Fig. 1). Fig. 2–5 present the arrangement and the logical sequence of the different methods of data analysis (ecological profiles, factor analysis,...) which allows the study of the relations between environmental and floristical variables, in a quick and efficient way. Cooperation with the Ecothèque méditerranéene at Montpellier is both necessary and fruitful. One example is presented using the selection ‘e’ of 58 relevés of salt marsh vegetation retained by the Working Group for Data-Processing of the International Society for Vegetation Science.
    Notes: Résumé Les auteurs proposent ici une organisation du traitement des données en phytosociologie et phyto-écologie. L'organisation repose sur un système bien développé pour rassembler et codifier l'information des reléves. (fig.1). Un ordinogramme (Fig. 2–5) présente l'agencement et l'enchaînement des différentes méthodes d'analyse des données (profils écologiques, analyse factorielle, ...) qui permettent d'étudier les relations entre variables du milieu et variables floristiques. La conception de l'enchaînement des fichiers et des programmes de traitement permet d'aboutir assez rapidement aux résultats, facilitant ainsi la tâche du phytosociologue et du phyto-écologue. Ce travail a été réalisé en commun entre le C.E.P.E. Louis Emberger et l'Ecothèque méditerranéenne conduisant à une coopération nécessaire et utile. Une exemple est traité utilissant la sélection ‘e’ de 58 relevés de milieux salés, sélection retenue par le groupe de travail ‘traitement des données en phytosociologie’ de l'Association internationale de phytosociologie.
    Type of Medium: Electronic Resource
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