繊毛虫Colpoda cucullusの生活環中における微細構造の変化 : I.栄養期

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The fine structure of the ciliate, Colpoda cucullus, which was in the vegetative stage, was studied with an electron microscope. The pellicle has a two-layered structure like other ciliates. The cilium is peculiar in having one dense discoidal body on the transverse partition spreading between the cilia proper and the basal body. The protrichocysts showing a non-differentiated structure are closely arranged under the sruface of the organism. The mitochondrion belongs to the same type as that of other ciliates and it bears many microvilli that protrude themselves in all directions from its inner wall. The wall of food vacuole projects toward the cytoplasm at places in small swellings which seem to be in the course of absorption of food. The section of each branch of the nucleolus, which runs radially from the center of the macronucleus, shows a loose gathering of dense spherical bodies of 3,500〜4,500 A each in diameter. Excepting the nucleolus, the karyoplasm is composed of numberless units of dense fibrils and the connection between the units is recognized. Each unit is formed of 3〜15 fibrils of 260 A each in diameter. The same structure can be also traced in the karyoplasm of micronucleus. In the cytoplasm are equally scattering rough-surfaced endoplasmic reticulum and heavy dense spheroidal bodies of 1,500 A each in diameter.
社団法人日本動物学会の論文
1963-03-15