@article{oai:narasaho-c.repo.nii.ac.jp:00000152,
 author = {菅沼, 美子 and 為房, 智子 and SUGANUMA, Yoshiko and TAMEFUSA, Noriko},
 issue = {7},
 journal = {研究紀要, Bulletin of Studies},
 month = {Dec},
 note = {This study observed the ultrastructure of the micronucleus of Tetrahymena thermophila while pronuclei were formed. 1 ) The chromosome observed in the prezygotic division consists of a loose mass of fine chromonema, 6~8 nm in thickness. 2) The cap-form kinetochore consists of two structures: the core measuring approximately 210 nm in outer diameter and 20 nm in thickness and a surrounding halo approximately 30 nm in thickness. 3 ) Kinetochore always positions with its apex toward the pole. The kineto-microtubules are attached to the halo (convex surface) and the mesh of thin threads of chromonema was attached to the inner concave surface of the core. 4 ) The other edge of the bundle of kineto-microtubules stops somewhere near the inner nuclear membrane, inside of the polar area. 5) In the third prezygotic division, the elongated nucleus runs parallel to the cell-to-cell joint region. The pronucleus positioned in the apex of the joint region becomes a migratory pronucleus and the latter part becomes a stationary pronucleus. 6) Within the cytoplasm of the outer side of the migratory pronucleus, there are numerous microtubules and microfilaments which contribute to the processes of pronucleus exchange and the cell-to-cell joint region reformation after such exchange.
Key Words : ultrastructure, conjugation, pronucleus, kinetochore., 論文},
 pages = {27--38},
 title = {接合期Tetrahymena thermophilaの原核形成過程の電顕的研究},
 year = {1997},
 yomi = {スガヌマ, ヨシコ and タメフサ, ノリコ}
}