| 释义 |
lampbrush Cytology.|ˈlæmpbrʌʃ|
Also (with hyphen) lamp-brush.
[repr. G. lampencylinderputzer lit. ‘lamp-glass cleaner’, to which lampbrush chromosomes were likened by J. Rückert (in Anat. Anzeiger (1892) VII. 115): see lamp n.1 and brush n.2]
Used attrib. to designate chromosomes having numerous paired lateral projections or loops, which loops are usu. apparent only during diplotene in a few groups of animals and give the whole chromosome the appearance of a bottle-brush.
[1901Jrnl. R. Microsc. Soc. 135 This large nucleolus then breaks up..with the production of ‘bottle-brush’ and plumose figures in the caryoplasm.] 1911Ibid. 456 The formation of the curious ‘lamp-brush’ chromosomes. 1925E. B. Wilson Cell (ed. 3) iv. 350 Thus are the very loose so-called ‘lamp-brush’ chromosomes.., characteristic of the middle growth-period in large, yolk-bearing eggs. 1940Proc. Nat. Acad. Sci. XXVI. 344 The typical lamp⁓brush chromosomes of the ovocytes of lower vertebrates. 1965Peacocke & Drysdale Molecular Basis Heredity vii. 72 In the newt, Triturus cristatus, large diplotene chromosomes may be isolated from oocytes and maintained for several days in buffer. These ‘lampbrush chromosomes’ are sufficiently large for the action of enzymes on the chromosomes to be studied microscopically. Evidence obtained from this material supports the conclusion that chromosomes contain protein, RNA and DNA. |