| 释义 |
eukaryon Biol.|juːˈkærɪən|
Also -caryon. Pl. eukarya.
[f. Gr. εὐ- eu- + κάρυον nut, kernel: cf. prokaryon, eukaryote.]
The highly organized nucleus, bounded by a nuclear membrane, that is characteristic of a eukaryotic cell.
1957[see prokaryon]. 1967Jrnl. Med. Lab. Technol. XXIV. 261 Eucaryon, the highly organized nucleus characteristic of higher organisms.
▸ = eukaryote n. Also (in pl., in form Eukarya): a taxon comprising the eukaryotes, coextensive with Eukaryota.
1990C. R. Woese et al. in Proc. National Acad. Sci. U.S.A. 87 4576 We propose that a formal system of organisms be established in which above the level of kingdom there exists a new taxon called a ‘domain’. Life on this planet would then be seen as comprising three domains, the Bacteria, the Archaea, and the Eucarya, each containing two or more kingdoms. 1996Guardian 7 Nov. i. 9/1 The tree of life at its simplest is three linked bushes of single-celled creatures called bacteria, archaea and eukarya. 1998Nucleic Acids Res. 26 3753 The deduced amino acid sequence of this newly identified gene shares significant similarity with the TRM1-like genes of three other archaea,..one eukaryon,..and one hyperthermophilic eubacterium. 2000C. Tudge Variety of Life ii. i. 100 The three domains are now widely known as the Archaea (colloquially ‘archaes’), the Bacteria, and the Eucarya. 2003Nature 27 Nov. 391/2 Eukarya appear to have derived a number of energy-related enzymes by gene transfer from Bacteria. |