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  • 1970-1974  (2)
  • 1972  (2)
  • Bufo bufo  (1)
  • Polymer and Materials Science
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 125 (1972), S. 88-107 
    ISSN: 1432-0878
    Keywords: Adenohypophysis ; Bufo bufo ; Cell differentiation ; Larval growth ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Cinq types de cellules granulées se différencient au cours de la métamorphose dans la pars distalis de l'hypophyse du têtard de Crapaud. A la prémétamorphose apparaissent les deux types de cellules protidiques, les cellules glycoprotidiques de type II et des cellules glycoprotidiques d'un type intermédiaire. Cette dernière catégorie cellulaire disparaît au climax. A la prométamorphose se différencient les cellules glycoprotidiques de type IV. Au climax s'observent les cellules glycoprotidiques de type III. Les cellules glycoprotidiques de type II sont vraisemblablement responsables de la sécrétion de l'hormone thyréotrope (TSH). Il n'est pas encore possible de préciser la fonction des autres types cellulaires. Des fibres nerveuses ont pu être observées dans la pars distalis entre les cellules granulées.
    Notes: Summary Five granulated cell types can be distinguished in the Toad's pars distalis during larval growth. During premetamorphosis the two types of protidic cells appear, the glycoprotein containing cells of type II and an intermediary cell type which disappears during the climax. During prometamorphosis the glycoprotein cells of type IV are apparent. During the climax the glycoprotein cells of type III can be observed. The glycoprotein containing cells of type II probably produce the thyroid-stimulating-hormone (TSH). The function of the other cell types can not be specified for the moment. Nervous fibers have been observed in the pars distalis between granulated cells.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Styrenetricarbonylchromium (IV) has been synthesized. Monomer IV did not homopolymerize with free-radical initiation but copolymerized with styrene, methyl acrylate, and vinylcymantrene. The copolymerizations were carried out in benzene solutions at 70°C with azobisisobutyronitrile as the initiator. The relative reactivity ratios were determined for the styrene and methyl acrylate copolymerizations. They were (defining M1 as monomer IV) r1 ≅ 0, r2 ≅ 1.39 for styrene copolymerizations and r1 ≅ 0, r2 ≅ 0.75 for methyl acrylate copolymerization. Polystyrene reacted with chromium-hexacarbonyl in refluxing DME to produce a polymer in which about 32% of the benzene rings were complexed with —Cr(CO)3 units. The use of a polystyrene of narrow molecular weight distribution in this reaction demonstrated that no decomposition of the polystyrene chains occurred.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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