| 释义 |
cytaster Biol.|ˈsaɪtæstə(r)|
[a. G. cytaster (W. Flemming Zellsubstanz (1882) 379), f. as prec. + aster 4.]
a. = aster 4.
b. An aster-like structure which may be present in or induced in the cell when the nucleus is not dividing.
1892A. A. Crozier Dict. Bot. Terms 50/2 Cytaster, a series of achromatic rays extending from each pole of the nucleus in karyokinesis into the cytoplasm. 1901E. B. Wilson in Arch. f. Entwickelungsmechanik XII. 541 In these eggs the first stage is..followed by the appearance of a variable number of vague clear spots in the cytoplasm which..become surrounded with radiating lines of granules and finally assume the form of asters. These, which are obviously identical with Morgan's ‘artificial astrospheres’, may be called cytasters, in contradistinction to the nuclear asters that are connected with the nucleus. 1925― Cell (ed. 3) 1129 Cytaster... An aster not associated with chromosomes; commonly employed as equivalent to ‘accessory aster’ or supernumerary aster. 1952A. Hughes Mitotic Cycle iv. 108 Cytasters induced in activated Echinarachnius eggs were examined. 1960L. Picken Organization of Cells vii. 254 Any part of the cytoplasm can participate in the formation of scattered cytasters and of the normal amphiaster. |