| 释义 |
† strepsinema Cytology. Obs.
[f. Gr. στρεψι-, comb. form of στρέϕειν to twist + νῆµα yarn.]
A condition of the nucleus during cell division, characterized by pairs of chromosomes twisted around one another or in the form of twisted rings; in most cases applied to diplotene nuclei.
1900H. H. Dixon in Proc. R. Irish Acad. VI. 2 In the next stage (fig. 2) the nucleus is in what I would suggest to call the ‘strepsinema’ condition. The chromatin appears in much the same condition as in the preceding stage, except that in many places it may be seen that the two portions of the thread are more or less loosely twisted together. 1911Q. Jrnl. Microsc. Sci. LVII. 15 The onset of synizesis coincides with the entrance of the nucleus into strepsinema. 1925E. B. Wilson Cell (ed. 3) ii. 126 A noteworthy peculiarity of the spireme sometimes seen is a twisting of the longitudinal halves about each other to form a strepsinema; but this is much less common in the somatic mitoses than in meiosis. |