| 释义 |
plasmotomy Biol.|plæzˈmɒtəmɪ|
[ad. G. plasmotomie (F. Doflein 1898, in Zool. Jahrb. (Abt. für Anat. und Ontogenie) XI. 317): see plasmo- and -tomy.]
A mode of reproduction in certain protozoans, in which the organism divides into two or more multinucleate daughter cells.
1902Encycl. Brit. XXXII. 817/2 Cohn and Döflein have discovered cases of plasmotomy, in which a kind of protoplasmic bud of ectosarc and endosarc containing some nuclei becomes detached. 1947Jrnl. Morphol. LXXX. 96 Finally, the organism undergoes plasmotomy into from 2 to 6 individuals. 1973M. A. Sleigh Biol. Protozoa iv. 72 Division of a cell is normally preceded by nuclear division, by either mitosis or meiosis, although in some multinucleate forms fission and nuclear division are not linked, so that for example new individuals may be formed by plasmotomy in which the body is simply separated into multinucleate masses—at any time some nuclei may be found in mitosis in such organisms.
Hence plasmoˈtomic a.
1949Jrnl. Morphol. LXXXV. 164 Plasmotomic division into two daughter individuals does not results [sic] in a 50:50 distribution of the nuclei. |