| 释义 |
dereˈpress, v.
[f. de- II. 1 + repress v.1]
trans. To cause to be no longer repressed; to activate. So dereˈpressed ppl. a.
1960Biochem. & Biophys. Res. Communications III. 373 (heading) A ‘pace-setting’ phenomenon in derepressed enzyme formation. 1962Proc. Nat. Acad. Sci. XLVIII. 1805 The use of leucine auxotrophs makes it possible to derepress maximally all the enzymes of isoleucine–valine biosynthesis. 1971Nature 11 June 395/2 Environmentally stimulated derepressed regions of the DNA molecule. 1976Smythies & Corbett Psychiatry vii. 120 Various personality traits which he had previously been able to keep under control may be derepressed. 1977P. B. & J. S. Medawar Life Sci. xiv. 119 Genes which operate in fetal life and are then normally switched off are somehow reawakened or ‘derepressed’ in tumours. 1978Nature 16 Mar. 253/1 Sea urchin eggs are shed in a metabolically repressed state and are derepressed by fertilisation.
Hence dereˈpression, the action or result of derepressing.
1960Biochem. & Biophys. Res. Communications III. 373 The change from repression to derepression occurs relatively abruptly. 1971J. Z. Young Introd. Study Man xxii. 288 These may take many forms, perhaps by derepression of operons. 1978Nature 4 May 52/2 They suggested that such reactions are due to the derepression of ‘silent’ genes in the tumours resulting in the expression of foreign H-2 antigens. |