| 释义 |
chromidium|krəʊˈmɪdɪəm|
Pl. -idia |-ˈɪdɪə|. Biol.
[mod.L. (pl. chromidia), ad. G. chromidien pl. (R. Hertwig 1902, in Archiv f. Protistenkunde I. 4), f. chrome + L. dim. termination -idium.]
A granule or strand of chromatin in the cell-body (see also quot. 1960). Hence chroˈmidial a.; chromidiˈogamy (see quots. 1912, 1920); chroˈmidiosome (quot. 1912).
1906Cambr. Nat. Hist. I. 30 In many Sarcodina and some Sporozoa the nucleus gives off small fragments into the cytoplasm or is resolved into them; they have been termed ‘chromidia’ by R. Hertwig. Ibid. 52 The nucleus..often gives off ‘chromidial’ fragments. 1912E. A. Minchin Protozoa 65 note, It is proposed in this work to use the term chromidiosome to denote the smallest chromatin-particles of which the chromidial mass is made up... The term ‘chromidiosome’ must therefore be applied to the ultimate, individual grain or particle of chromatin, alike whether it be lodged inside or outside a nucleus. Ibid. 126 The chromatin that undergoes syngamic union may be in the form either of chromidia or of nuclei; in the former case the process is termed chromidiogamy, in the second karyogamy. 1920W. E. Agar Cytol. 208 Fusion or mingling of chromidia (chromidiogamy, Swarczewsky). 1960L. Picken Organiz. Cells vi. viii. 242 The cytoplasm..did not..contain a mass of granules but bundles of what appeared to be fibrils... For these structures, Bernhard et al. revived the term chromidia..first applied to cytoplasmic structures related in staining properties to the substance of the chromosomes. The new chromidium appeared to be associated with the RNA of the cytoplasm. |