derepressv.
transitive. To cause to be no longer repressed; to activate.
ΘΚΠ
the world > action or operation > undertaking > beginning action or activity > begin or enter upon (an action) [verb (transitive)] > bring into activity or activate
enter1563
inact1583
active1620
activate1624
yoke1630
animate1646
inactuate1651
to bring (also call, put) into (also in) play1799
to put onc1842
to bring on1860
mobilize1871
derepress1962
1962 Proc. National Acad. Sci. U.S.A. 48 1805 The use of leucine auxotrophs makes it possible to derepress maximally all the enzymes of isoleucine–valine biosynthesis.
1976 J. R. Smythies & L. Corbett Psychiatry Students of Med. vii. 120 Various personality traits which he had previously been able to keep under control may be derepressed.
1977 P. B. Medawar & 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.
1978 Nature 16 Mar. 253/1 Sea urchin eggs are shed in a metabolically repressed state and are derepressed by fertilisation.
Derivatives
dereˈpressed adj.
ΘΚΠ
the world > action or operation > undertaking > beginning action or activity > [adjective] > bringing into action > brought into action or set in operation
started1468
started1519
raiseda1616
actuated1628
derepressed1960
1960 Biochem. & Biophysical Res. Communications 3 373 (heading) A ‘pace-setting’ phenomenon in derepressed enzyme formation.
1971 Nature 11 June 395/2 Environmentally stimulated derepressed regions of the DNA molecule.
dereˈpression n. the action or result of derepressing.
ΘΚΠ
the world > action or operation > undertaking > beginning action or activity > [noun] > bringing into action
animation1605
actuation1623
inactuation1662
actuating1710
energizing1841
activation1883
activating1902
derepression1960
1960 Biochem. & Biophysical Res. Communications 3 373 The change from repression to derepression occurs relatively abruptly.
1971 J. Z. Young Introd. Study Man xxii. 288 These may take many forms, perhaps by derepression of operons.
1978 Nature 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.
This entry has not yet been fully updated (first published 1989; most recently modified version published online June 2019).
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