The Fine Structure of Salivary Chromosomes

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  • Yasuzumi G.
    Anatomical Department, Faculty of Medicine, Osaka University
  • Odate Z.
    Anatomical Department, Faculty of Medicine, Osaka University
  • Ota Y.
    Anatomical Department, Faculty of Medicine, Osaka University

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The microstructure of the salivary chromosome of Drosophila virilis has been investigated by means of the electron microscope. Flemming's mixture has been used for fixing, and the replica-shadow casting method employed. Thus the most minute structure of the chromosome has been elucidated.<br>1. The interchromatin regions are composed of a multitude of longitudinal strands, namely, chromonemata. These show beaded struc-ture with a periodicity between 30mμ and 60mμ.<br>2. The chromomeres distinctly appear when the chromosome has been subjected to digestion with desoxyribonuclease or trichloracetic acid.<br>3. The matrix is often removed from the chromosomes; but under favorable circumstances it can be observed along with the chromone-mata.

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