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  • 1975-1979  (2)
  • 1
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Conclusion In guinea-pigs, endogen histamine directly affects smooth muscle bronchial receptors and a vagal reflex is not implicated in such an action in our experiments. The action of atropine may be explained by an effect of histamine on the postganglionary parasympathetic neuron.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-9104
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Il a été recherché si l'on pouvait mettre en évidence des différences entre le comportement respiratoire, pendant la croissance et la maturation, d'un fruit ‘non climactérique’: la Cerise (var. Bigarreau Napoléon) et celui d'un fruit ‘climactérique’: la Poire (var. Passe-Crassane). Cette dernière variété présente la particularité d'exiger un séjour au froid pour avoir une maturation normale. Chez les jeunes fruits, une crise respiratoire existe naturellement chez la Cerise, mais non chez la Poire. L'éthylène est capable de provoquer une crise respiratoire. Chez le fruit plus âgé, l'effet de l'éthylène est variable. Un traitement bref semble incapable de supprimer le besoin de froid présenté par la Poire. Ces résultats soulignent l'intérêt de recherches sur les mécanismes permettant ou empêchant le déroulement normal de la maturation et sur les liens unissant celle-ci avec la crise respiratoire de type climactérique et avec les effets de l'éthylène.
    Notes: Abstract Respiratory behaviour and response to ethylene of two fruits was compared during growth and maturation. The first one, the cherry (var. Bigarreau Napoleon) is ‘non climacteric’. The second one, the pear (var. Passe-Crassane) is ‘climacteric’ and needs a certain period of cold for its usual maturation. Young cherries exhibit a natural respiratory rise after 4 or 5 days of storage but young pears do not. Breaf ethylene treatments involve a rise of respiration, more intense with the pear. As for ‘adult’ fruits the respiratory response varies but the effect on ripening is not established and, in our conditions, does not seen to be really significative. The following question can be asked. What are the relations between respiration (with or without a climacteric rise), the different ripening phenomena and the action and role of ethylene? More generally, it would be very interesting to study, in a comparative way, the ripening of climacteric and non climacteric fruits, with a special look at the factors promoting, delaying or preventing the normal course of ripening.
    Type of Medium: Electronic Resource
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