| 释义 |
embryoid, a. and n.|ˈɛmbrɪɔɪd|
[f. embryo + -oid.]
A. adj. Med. Resembling an embryo; rare—0 except in embryoid body, an aggregate of cells that develops when certain mouse tumours are injected into the peritoneal cavity of a mouse or grown in culture, somewhat similar to an early embryo in its structure and its potential for differentiation.
1934Webster, Embryoid. 1958Jrnl. Nat. Cancer Inst. XX. 1263 These embryoid bodies have not been observed in primary strain 129 [mouse] teratomas. 1964Cancer Res. XXIV. 1544 Small embryoid bodies..were obtained from ascitic conversion of a murine terato-carcinoma. 1975Nature 6 Nov. 12/2 The ascites form of the tumour consists of numerous small ‘embryoid bodies’ floating in the ascites fluid; the simplest of these aggregates are made up of an outer layer of endoderm cells surrounding a core of embryonal carcinoma cells. 1977C. F. Graham in M. I. Sherman Concepts in Mammalian Embryogenesis vii. 332 The greatest range of differentiated tissue forms after both simple and cystic embryoid bodies are plated out on tissue culture dishes... During the next two weeks..many cell types can be observed..such as neural tissue..and glandular epithelium.
B. n. Bot. An embryonic plant developed in a culture medium from a single cell.
1964I. K. Vasil et al. in Plant Physiol. XXXIX. (Suppl.) p. lxiii/2 The tissue first formed a free suspension of cells and cell groups. Gradually many small round masses of tissue, designated here as embryoids, were formed by further cell division. The embryoids produced roots at one end and then typical..leafy structures at the other end giving rise to normal-looking plantlets. Originating from single cells various stages of embryoid formation were seen in the liquid medium. 1971New Scientist 29 Apr. 263 (caption) These cells are then cultured, and from them are grown embryoids and eventually whole ‘pomatoes’. 1980Nature 27 Mar. 341/2 We report here a repeatable precocious flowering of embryoids derived from mature ginseng root callus cultured in a chemically defined medium. 1983New Scientist 26 May 555/3 We have been altering the concentrations of growth regulator to try to stimulate the callus to form so-called somatic embryos or embryoids. These embryoids are analogous to the normal embryos in the seed but contain only genetic material from the single parent—that is, they are clonal. |