繊毛虫Colpoda cucullusの生活環中における微細構造の変化 : II.前休眠包嚢期から第一層休眠包嚢膜形成初期まで

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The changes of fine structure from the preencystment stage to the early stage of the formation of the first layer of resting cyst membrane were traced under an electron microscope. 1. In the preencystment stage, a network structure characteritically appears in the cytoplasm, and the endoplasmic reticulum is reduced in quantity. 2. As soon as the organism begins the formation of a resting cyst, a network structure is thrown out through the surface of the body and covers the organism with a layer of amorphous fibrillar structure. All the cilia begin to fall on the pellicle and thereby disappear, leaving only their basal bodies. The pellicle becomes thick and develops into the first layer of the resting cyst membrane. The food vacuoles decrease in number. The microvilli of each mitochondrion increase in number for a while, but soon after their contour grow obscure. At this point each mitochondrion shows low electron density. The electron dense spherical bodies composing the nucleolus in the vegetative stage confuse one another, making large masses here and there. The karyoplasm of the macronucleus changes from the structure of assemblance of fibrils to a granular structure showing high electron density. The heavy electron dense spheroidal bodies scattered in the cytoplasm, which conld be observed in the vegetative stage, do not show any changes in number and shape.
社団法人日本動物学会の論文
1963-05-15