| 单词 |
ooplasm |
| 释义 |
ooplasm Biol.|ˈəʊəplæz(ə)m|
[f. oo- + plasm.]
The cytoplasm of an egg (see also quot. 1956).
1899Bot. Gaz. XXVIII. 237 There is a stage called zonation in which the nuclei, usually in metaphase, are lined up around the ooplasm. 1939P. Weiss Princ. Devel. i. 78 Only that part of the egg which consists of true oöplasm is broken up into cells, while those portions which consist mainly of yolk remain either unsegmented or cleave with considerable delay. 1956C. H. Waddington Princ. Embryol. i. 16 The different regions of the cytoplasm of the egg may have specific properties, so that a particular region can only develop in one way. Such regions are spoken of as ooplasms; an older name was ‘organ-forming substances’. 1974Acta Anat. LXXXIX. 616 A granular or flocculent material, presumed to consist of blood proteins, in the intercellular spaces outside the oocyte, in the pinocytotic vesicles inside the oocyte, and in the ooplasm itself.
Hence ooˈplasmic a.
1905Jrnl. Exper. Zool. II. 147 The third cleavage is equatorial... The ectoplasm is now completely segregated in the four ventral cells but the other oöplasmic substances are not as yet located in separate cells. 1925E. B. Wilson Cell (ed. 3) iv. 338 The enormous increase in the cytoplasmic or oöplasmic substance during the growth of the oöcyte leads to the production of the largest known forms of cells. 1961N. J. Berrill Growth xix. 483 Some insight into the ooplasmic specialization of the primitive chordate egg may be gained by a comparison among the embryonic developments in the ascidian Styela, the larvacean tunicate Oikopleura, and Amphioxus. 1968F. G. Gilchrist Survey of Embryol. iv. 65/2 A considerable rearrangement of the materials of the cytoplasm also takes place during meiosis... The rearrangement is termed ooplasmic segregation. |
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单词 oophyte 释义 oophyte= oophore: see oo-.{var l=document.getElementsByTagName("link");v......