…The process in which one nucleus divides into two daughter nuclei is called nuclear division. Nuclear division was previously divided into mitosis, in which thread-like structures such as chromosomes and spindles appear, and amitosis, in which the nucleus splits into two without any clear morphological changes. However, the latter is now considered to be a normal division in prokaryotic cells, but a degenerative phenomenon in pathological eukaryotic cells. Following nuclear division, the cytoplasm also divides, including each nucleus. … *Some of the terminology explanations that mention "amitosis" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…一つの核がこのように二つの娘核になることを核分裂という。核分裂は従来,染色体や紡錘体のような糸状構造が現れる有糸分裂mitosisと,明確な形態変化が現れないまま核が二つにくびれる無糸分裂amitosisに分けられていたが,現在では後者は原核細胞では正常な分裂だが,真核細胞では病的細胞における退行的現象とみなされるようになっている。核分裂に引き続いて細胞質もそれぞれの核を含んで分かれる。… ※「amitosis」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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