restriction

restriction
1. The process with which foreign DNA that has been introduced into a prokaryotic cell becomes ineffective. 2. A limitation.
- asymmetric fetal growth r. normal fetal head size as a result of preferential shunting of blood to brain, and decreased abdominal circumference from decreased adipose tissue and liver size; probably caused by placental insufficiency.
- fetal growth r. fetal weight ≤5th percentile for gestational age. SYN: intrauterine growth retardation.
- lactase r. an inherited trait in which there is low lactase activity and thus there is defective lactose intestinal metabolism. Cf.:lactase persistence.
- MHC r. T helper cells only recognize an antigen that is presented with class II major histocompatibility antigens whereas T cytotoxic cells usually only recognize a processed antigen in conjunction with class I major histocompatibility antigens.
- symmetric fetal growth r. proportional reduction in fetal head and body size, commonly constitutional or caused by an early intrauterine insult such as infection.

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re·stric·tion ri-'strik-shən n, often attrib the breaking of double-stranded DNA into fragments by restriction enzymes <\restriction sites>

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re·stric·tion (re-strikґshən) 1. a limitation. 2. a thing or process that limits.

Medical dictionary. 2011.

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  • restriction — [ rɛstriksjɔ̃ ] n. f. • 1380; restrinction méd. « resserrement » 1314; bas lat. restrictio 1 ♦ Ce qui restreint le développement, la portée de qqch. (condition, exception). Il faut apporter des restrictions à ce principe. Émettre une restriction …   Encyclopédie Universelle

  • restriction — re·stric·tion n 1: something that restricts: as a: a regulation that restricts or restrains b: a limitation on the use or enjoyment of property or a facility 2 a: an act of restricting b: the state of being restricted …   Law dictionary

  • restriction — re‧stric‧tion [rɪˈstrɪkʆn] noun [countable] an official rule that limits or controls what people can do or what is allowed to happen: • Construction lending has been badly hit by restrictions on loans. • It plans to relax the tough import… …   Financial and business terms

  • restriction — Restriction. s. f. (L s se prononce.) Condition qui restreint, modification. Mettre, apporter quelque restriction. l edit a esté verifié sans restriction. cette clause porte restriction …   Dictionnaire de l'Académie française

  • Restriction — Re*stric tion, n. [F. restriction, L. restrictio.] 1. The act of restricting, or state of being restricted; confinement within limits or bounds. [1913 Webster] This is to have the same restriction with all other recreations,that it be made a… …   The Collaborative International Dictionary of English

  • restriction — [ri strik′shən] n. [ME restriccion < MFr restriction < L restrictio] 1. a restricting or being restricted 2. something that restricts; limitation …   English World dictionary

  • restriction — restriction. См. рестрикция. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • restriction — (n.) early 15c., from L.L. restrictionem (nom. restrictio) limitation, from pp. stem of L. restringere restrict, bind fast, restrain, from re back (see RE (Cf. re )) + stringere draw tight (see STRAIN (Cf. strain) (v.)) …   Etymology dictionary

  • restriction — [n] limit ball and chain*, bounds, brake, catch, check, circumscription, condition, confinement, constraint, containment, contraction, control, cramp, curb, custody, demarcation, excess baggage*, fine print*, glitch*, grain of salt*, handicap,… …   New thesaurus

  • restriction — Restriction, Modification, Moderatio, siue Praescriptio aut Praescriptum. B …   Thresor de la langue françoyse

  • restriction — ► NOUN 1) a limiting condition or measure. 2) the action of restricting or the state of being restricted …   English terms dictionary

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