| 单词 | germ cell |
| 释义 | > as lemmasgerm cell germ cell n. [in sense (a) after German Keimzelle (1840 in the passage translated in quot. 1842)] †(a) the fertilized ovum (zygote), or a cell immediately derived from this (obsolete); (b) a cell involved in sexual reproduction; an ovum, spermatozoon, or cell that gives rise to these; (in early use) spec. †the egg as contrasted with the sperm (obsolete). ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [noun] > germ cell or mass seminary1671 germinal cell1840 germ mass1840 germ cell1842 cleavage-mass1871 cleavage-cell1879 cleavage-globule1879 gastrodisc1881 blastule1882 1842 W. Baly tr. J. Müller Elements Physiol. II. 1448 The embryo of plants and animals..is composed of a number of cells similar to the first, or germ cell. 1855 R. Owen Lect. Compar. Anat. Invertebr. Animals (ed. 2) 673 Germ-cell, the first nucleated cell that appears in the impregnated ovum, after the reception of the spermatozoon and the disappearance of the germinal vesicle. 1868 W. B. Carpenter Microscope (ed. 4) 335 The Sexual distinction of the Generative cells into ‘Sperm-cells’ and ‘Germ-cells’. 1886 Nature 28 Oct. 631/1 Amongst these [sc. unicellular Protozoan ancestors] there is no distinction between body-cells and germ-cells. 1918 Cunningham's Text-bk. Anat. (ed. 5) 12 The germ cells reach their full development in special sex glands, the ova in the ovaries of the female and the spermatozoa in the testes of the male. 2004 Independent 5 Aug. 3/1 The technique relies on transplants of ‘primordial germ cells’, which are the specialised tissues of embryonic fish that eventually develop into the gonads. < as lemmas |
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