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  • 1
    ISSN: 0022-5320
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-1463
    Keywords: Autonomic innervation ; AChE and ZIO reactions ; newt pancreas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The intrinsic innervation in the pancreas of newtsTriturus vulgaris, Tr. montandoni andNotophthalmus viridescens was studied in electron microscopy using AChE and ZIO reactions. All the investigated species display: cholinergic innervation better developed than adrenergic, no qualitative differences regarding the fine structure of nerve fibers and terminals as compared to that previously described in the pancreas or in other glands, axo-axonal contacts. Their functional signification as peripheric synapses is suggested. frequently neuro-glandular junctions with or without membrane specializations. The occurrence of the latter is discussed in connection with peripheral transmission of nervous impulse.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Histochemistry and cell biology 32 (1972), S. 271-279 
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary AChE activity in pancreas of some amphibians, reptiles and birds was investigated with light microscope using Karnovsky's technique. A nervous and an extranervous localization of the enzyme showing considerable qualitative and quantitative differences depending on the systematic group, could be discerned. Pancreatic peripheral cholinergic autonomic system comprises nerve fibers and perikarya. The latter seem to occur in newt and frogs as Cajal's interstitial cells (CIC) and are undoubtedly present in birds as CIC and as ganglionic cells. In lizard and snakes they were not present. The extranervous localization of AChE activity was observed in islet cells in frogs, lizards and snakes, also in the walls of blood vessels of all investigated poikilotherms. The findings are compared with results previously obtained in mammalian pancreas or in other organs. Some hypotheses on the physiological significance of enzyme presence in endocrine cells, as well as their belonging to APUD cell series are discussed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 97 (1969), S. 212-225 
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Langerhansschen Inseln der Ringelnatter Natrix n. natrix wurden licht- und elektronenmikroskopisch untersucht. Beobachtungen über die Lokalisation, die Größe und das histologische Gesamtbild der Inseln werden mitgeteilt. Lichtmikroskopisch wurden drei Haupttypen von Inselelementen gefunden, die bei allen Wirbeltierklassen vorkommen: B-, A1- und A2-Zellen, außerdem D-Zellen und amphiphile Elemente. Elektronenmikroskopisch wurden insbesondere nach dem Aussehen und der Größe der Sekretgranula Zellen der Typen B, II, III und IV identifiziert, außerdem noch X-Zellen und amphiphile Zellen. Es wird die Meinung vertreten, daß die A1-Zellen mit Zelltyp II und die A2-Zellen mit Zelltyp III identisch sind. Die Ergebnisse werden mit Befunden, die bei Schlangen oder bei anderen Wirbeltieren erhoben wurden, verglichen.
    Notes: Summary The general histological order, as well as size and localisation of Langerhans islets of the grass-snake Natrix n. natrix were investigated in the light and electron microscopes. In the light microscope, three main types of islet elements (B-, A1-, and A2-cells) and D- and amphiphil cells were identified. In the electron microscope B-, II-, III-, IV-, amphiphil-, and X-cells were identified, especially by the type of their secretory granules. The observations were related to results of previous studies on snakes and other vertebrates. The present study suggests that A1- and A2-cells may be identical with II- and III-cells respectively.
    Type of Medium: Electronic Resource
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