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  • 1980-1984
  • 1975-1979  (2)
  • 1955-1959
  • Coordinate Estimation  (1)
  • Dictyosomes  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    The effect of cytochalasin B on the rate of growth and ultrastructure of wheat coleoptiles and maize roots (1979)
    Springer
    Planta 144 (1979), S. 373-383 
    Details
    ISSN: 1432-2048
    Keywords: Auxin ; Cell elongation ; Cytochalasin B ; Dictyosomes ; Secretion ; Triticum ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cytochalasin B (CB) inhibits the elongation growth of maize roots, and that of wheat coleoptile segments incubated in indolyl-3-acetic acid, by over 30% after a lag period of about 60 min. This long lag is not due to poor tissue penetration by the inhibitor, but seems to reflect a property of the process inhibited by CB. The only visible ultrastructural change accompanying growth inhibition is the accumulation of secretory vesicles in the vicinity of dictyosomes, which occurs between 90 and 300 min. However, a massive accumulation of vesicles is seen after 120 min in root cap cells which possess very active dictyosomes. The results indicate that CB does not inhibit elongation growth by interfering with cytoplasmic streaming. Instead, they indicate that the drug acts to inhibit the secretion of cell wall components at some stage after vesicle production, but prior to their transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391581
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    An application of ordination to the identification of forest types (1976)
    Springer
    Plant ecology 32 (1976), S. 83-86 
    Details
    ISSN: 1573-5052
    Keywords: Classification ; Coordinate Estimation ; Ordination ; Tropical Forest
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Le problème d'insérer des relevés nouveaux dans une classification préexistante est esquissé. Une solution est de soumettre les relevés de la région étudiée à une analyse factorielle des correspondances, obtenant ainsi une ordination divisible en types de végétation. Un relevé nouveau peut se poser sur les axes de l'ordination, et dans le type correct, si la valeur moyenne d'ordination est calculée pour une liste brève des espèces constituantes.
    Notes: Summary The problems of allocating new vegetation stands to an existing classification are outlined. As one solution, the vegetation samples from an area may be ordinated by reciprocal averaging and classified by dividing the ordination into community-types. The ordination scores for a short list of species present in a new sample may then be averaged to locate that sample on the ordination axes and in one of the community-types. The method is tested by comparing estimates from incomplete species lists with that from a complete list of species in an forest stand in southern Ghana.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02111902
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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