繊毛虫Colpoda cucullusの生活環中における微細構造の変化 : IV.脱包嚢期における第一層休眠包嚢膜からの脱出

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The changes in the fine structure of the ciliate, Colpoda cucullus during the early stage of excystment-that is, when the resting cyst formed in the life cycle of the ciliate breaks through the first layer of resting cyst membrane-were traced under an electron microscope. The first layer of the resting cyst membrane does not show striking changes at first, but gradually deveolpes some fissures on its surface and eventually is cast off from the cyst. Network structures and amorphous fibrillar structures attach themselves to the discarded layer. The basal bodies of the cilia appear in the early stage of excystment and begin to be arranged in the inner wall of the third resting cyst membrane. The microvilli of mitochondria do not develop yet. The anlagen of trichocysts come in sight evenly scattering in the cytoplasm, but do not yet contain electron dense granules. The structure of both macro-and micronuclei already bears some resemblance to that present in vegetative life, although they differ from those of the vegetative life in the following points: their nuclear membranes are not distinct, the karyoplasm appears to be dense, and the nucleolus of the macronucleus does not contain electron dense granules. The dense spheroidal bodies begin to part from the periphery of nuclei and scatter in the cytoplasm.
社団法人日本動物学会の論文
1964-02-15