| 单词 | attraction sphere |
| 释义 | > as lemmasattraction sphere attraction sphere n. [in sense (b) after French sphère attractive (1887 or earlier)] †(a) the spherical region of space around a planet in which an object would be subject to a greater gravitational attraction from the planet than from the sun (obsolete. rare); (b) Cell Biology a mass of cytoplasm from which the asters extend during cell division and within which the centrosome lies when present; = centrosphere n. 2 (now rare). ΘΚΠ the world > life > biology > biological processes > genetic activity > genetic components > [noun] > chromosome > centrosphere attraction sphere1875 astrosphere1893 centrosphere1893 1875 Amer. Cycl. XIII. 570/2 The moon's attraction sphere, estimated solely with reference to the sun, has a radius equal to one ninth of the earth's. 1889 W. B. Benham tr. W. Waldeyer in Q. Jrnl. Microsc. Sci. 30 177 See below for polar rays and pole-bodies, as well as for the structures known as ‘attraction spheres’ of van Beneden. 1949 F. B. Hutt Genetics of Fowl ii. 19 Associated with it [sc. the nucleus] is a large, dense, cytoplasmic mass, the attraction sphere. < as lemmas |
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