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  • Rat kidney  (1)
  • Cold
  • 1970-1974  (1)
  • 1973  (1)
  • 1970-1974  (1)
  • 1
    ISSN: 1432-0568
    Keywords: Rat kidney ; Macula densa ; Dark and light cells ; Fixation procedure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Verfasser beschreiben die Ultrastruktur der dunklen Zellen in der Macula densa der Mittelstücke der Ratten-Niere nach Perfusionsfixierung in situ. In Vergleich mit den Resultaten aus einer früheren Versuchsreihe mit Immersionsfixierung ist der prozentuale Anteil der dunklen Zellen etwa viermal geringer, während ihre Ultrastruktur im Prinzip die gleiche geblieben ist. Die Verfasser vertreten die Auffassung, daß die dunklen Macula-Zellen nicht unbedingt Präparationsartefakte sind.
    Notes: Summary The authors describe the ultrastructure of the dark cells in the macula densa of the distal convoluted tubule of the rat kidney after fixation carried out by vascular perfusion in situ. In this case the frequency of the dark cells compared with that of the light cells is about four times lower than in previous investigations using the fixation procedure by immersion, whereas the ultrastructure remains essentially unchanged. However, the authors believe that the dark cells of the macula densa are not necessarily artifacts due to the preparation of the specimens for examination in the electron microscope. At present it is not yet possible to decide if the dark and the light cells are two specific cell types of the macula densa or if they represent two different functional stages of a single cell type.
    Type of Medium: Electronic Resource
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