TERMIUM Plus®
From: Translation Bureau
On social media
Consult the Government of Canada’s terminology data bank.
HALF REACTION [9 records]
Record 1 - internal organization data 2017-04-05
Record 1, English
Record 1, Subject field(s)
- Nuclear Fission Reactors
Record 1, Main entry term, English
- MAPLE reactor
1, record 1, English, MAPLE%20reactor
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- Multipurpose Applied Physics Lattice Experimental reactor 1, record 1, English, Multipurpose%20Applied%20Physics%20Lattice%20Experimental%20reactor
correct
- MAPLE 1, record 1, English, MAPLE
correct
- MAPLE research reactor 1, record 1, English, MAPLE%20research%20reactor
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
... MAPLE is tiny-just five metres high and one and a half metres in diameter at its widest point. The reactor core, which is loaded with 32 kilograms of uranium fuel, is the size of a large wastepaper basket. The entire reactor assembly rests in a pool of ordinary water, about 9. 5 metres deep and a minimum of two metres across, contained by a two-metre-thick wall of heavy concrete lined with stainless steel. The water is used to cool the fuel, establish the chain reaction that generates the neutrons, and shield researchers from radiation emanating from the core. 1, record 1, English, - MAPLE%20reactor
Record 1, French
Record 1, Domaine(s)
- Réacteurs nucléaires de fission
Record 1, Main entry term, French
- réacteur MAPLE
1, record 1, French, r%C3%A9acteur%20MAPLE
masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- MAPLE 1, record 1, French, MAPLE
masculine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
[...] le MAPLE est minuscule : à peine cinq mètres de hauteur et 1 m 50 de diamètre dans sa plus grande largeur. Le cœur du réacteur, chargé de 32 kg de combustible d'uranium, a les dimensions d'une grande corbeille à papier. L'ensemble du réacteur repose dans une piscine d'eau ordinaire, d'une profondeur d'environ 9 m 50 et d'une largeur minimale de deux mètres, entourée d'un mur de deux mètres d'épaisseur, en béton lourd doublé d'acier inoxydable. L'eau refroidit le combustible, établit la réaction en chaîne produisant les neutrons, et protège les chercheurs contre les radiations émanant du cœur. 1, record 1, French, - r%C3%A9acteur%20MAPLE
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 2011-08-23
Record 2, English
Record 2, Subject field(s)
- Chemistry
- Biotechnology
Record 2, Main entry term, English
- racemization
1, record 2, English, racemization
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record number: 2, Textual support number: 1 DEF
Conversion, by heat or by chemical reaction(e. g., enolization), of an optically active compound into an optically inactive form, in which half of the optically active substance becomes its mirror-image(enantiomer). 2, record 2, English, - racemization
Record 2, French
Record 2, Domaine(s)
- Chimie
- Biotechnologie
Record 2, Main entry term, French
- racémisation
1, record 2, French, rac%C3%A9misation
correct, feminine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
Record 2, Textual support, French
Record number: 2, Textual support number: 1 DEF
Réaction chimique transformant un énantiomère en mélange racémique correspondant. 2, record 2, French, - rac%C3%A9misation
Record number: 2, Textual support number: 2 DEF
Transformation spontanée ou provoquée d'un composé optiquement actif en racémique. 3, record 2, French, - rac%C3%A9misation
Record 2, Spanish
Record 2, Campo(s) temático(s)
- Química
- Biotecnología
Record 2, Main entry term, Spanish
- racemización
1, record 2, Spanish, racemizaci%C3%B3n
correct, feminine noun
Record 2, Abbreviations, Spanish
Record 2, Synonyms, Spanish
Record 2, Textual support, Spanish
Record 3 - internal organization data 2011-08-09
Record 3, English
Record 3, Subject field(s)
- Biological Sciences
Record 3, Main entry term, English
- Kcat
1, record 3, English, Kcat
correct
Record 3, Abbreviations, English
Record 3, Synonyms, English
- catalytic constant 2, record 3, English, catalytic%20constant
correct
- catalytic rate constant 2, record 3, English, catalytic%20rate%20constant
correct
Record 3, Textual support, English
Record number: 3, Textual support number: 1 DEF
First order rate constant that refers to the properties and reactions of the enzyme-substrate, enzyme-intermediate, and enzyme-product complexes. 1, record 3, English, - Kcat
Record number: 3, Textual support number: 1 CONT
Enzymes vary greatly in their rate enhancement ability, and not all have evolved to high maximum rate Vmax of conversion. High enzyme efficiency, through lowering of activation energy, is dependent on the enzyme having a high ratio of Kcat/Km, where Kcat is the rate constant for the reaction... and Km is the Michaelis constant(substrate concentration needed to give half maximum velocity). 3, record 3, English, - Kcat
Record number: 3, Textual support number: 1 OBS
In the simple Michaelis-Menten mechanism in which there is only one enzyme-substrate complex and all binding steps are fast, Kcat is simply the first-order rate constant for the chemical conversion of the ES complex to the EP complex. For more complicated reactions, Kcat is a function of all the first order rate constants, and it cannot be assigned to any particular process except when simplifying features occur. 1, record 3, English, - Kcat
Record number: 3, Textual support number: 2 OBS
The term Kcat should read Kcat. 4, record 3, English, - Kcat
Record 3, French
Record 3, Domaine(s)
- Sciences biologiques
Record 3, Main entry term, French
- k catalytique
1, record 3, French, k%20catalytique
correct
Record 3, Abbreviations, French
Record 3, Synonyms, French
- kcat 2, record 3, French, kcat
correct
- constante catalytique 2, record 3, French, constante%20catalytique
correct, feminine noun
Record 3, Textual support, French
Record number: 3, Textual support number: 1 DEF
Constante de premier ordre qui exprime le nombre de molécules de substrat transformées par molécule d'enzyme 1, record 3, French, - k%20catalytique
Record number: 3, Textual support number: 1 CONT
Km définit bien l'affinité de l'enzyme pour son substrat. Cependant, si l'on observe plus en détail les relations (1) et (2) on constate que cette affinité dépend surtout des constantes k1 et k2. [...] À l'opposé la vitesse d'apparition des produits (P), donc en définitive la vitesse de réaction, dépend surtout de k3. C'est pourquoi on donne à cette constante K3 le nom de k catalytique oukcat. Selon la relation (3) on a : [...] k[indice]cat exprime donc le nombre de molécules de substrat transformées par molécules d'enzyme. 2, record 3, French, - k%20catalytique
Record number: 3, Textual support number: 1 OBS
En raison de contraintes d'ordre technique, les formules figurant dans la source CBT-167 ne peuvent être reproduites. 3, record 3, French, - k%20catalytique
Record number: 3, Textual support number: 2 OBS
Le terme Kcat s'écrit Kcat 3, record 3, French, - k%20catalytique
Record 3, Spanish
Record 3, Textual support, Spanish
Record 4 - internal organization data 2011-02-09
Record 4, English
Record 4, Subject field(s)
- Biological Sciences
- Biotechnology
Record 4, Main entry term, English
- concentration
1, record 4, English, concentration
correct
Record 4, Abbreviations, English
Record 4, Synonyms, English
Record 4, Textual support, English
Record number: 4, Textual support number: 1 DEF
Ratio of the mass or volume of a solute to the mass or volume of the solution or solvent. It can be expressed in terms of molarity, molality, normality, or mol fraction. 2, record 4, English, - concentration
Record number: 4, Textual support number: 1 CONT
The rate of an enzyme reaction(V) varies with the substrate concentration, increasing with an increased concentration until a maximum value(Vmax) is reached. At this point, all enzyme molecules are fully occupied and the rate of reaction is limited by the rate of the catalytic process on the enzyme surface. For most enzymes, the concentration of substrate at which the reaction rate is half maximal(Km) is a measure of how tightly the substrates are bound, with a large value of Km representing a weak binding, and vice versa. 3, record 4, English, - concentration
Record number: 4, Textual support number: 1 OBS
See "concentration". 2, record 4, English, - concentration
Record 4, French
Record 4, Domaine(s)
- Sciences biologiques
- Biotechnologie
Record 4, Main entry term, French
- concentration
1, record 4, French, concentration
correct, feminine noun
Record 4, Abbreviations, French
Record 4, Synonyms, French
Record 4, Textual support, French
Record number: 4, Textual support number: 1 DEF
Quantité d'une espèce chimique existant dans un mélange homogène. On l'exprime habituellement, -soit par la masse du constituant rapporté à l'unité de volume de la solution, -soit par le nombre de moles de molécules du constituant, rapporté à l'unité de volume de la solution (molarité). 2, record 4, French, - concentration
Record number: 4, Textual support number: 1 CONT
Il existe des réactions d'ordre zéro, du premier ordre, du deuxième ordre et du troisième ordre, suivant la nature de la relation entre la vitesse de la réaction et la concentration d'un des réactifs dans des conditions données. La vitesse de certaines réactions chimiques est indépendante de la concentration des réactifs : on les appelle réactions d'ordre zéro. Beaucoup de réactions catalysées sont d'ordre zéro vis-à-vis des réactifs. Dans ces cas, la vitesse de réaction dépend de la concentration du catalyseur ou de divers facteurs autres que la concentration des composés chimiques qui entrent en réaction. Les réactions du premier ordre sont celles dont la vitesse est exactement proportionnelle à la concentration d'un réactif. Les réactions du deuxième ordre sont celles dont la vitesse est proportionnelle au produit des concentrations de deux réactifs différents, ou au carré de la concentration d'un seul réactif. Les réactions du troisième ordre, relativement rares, sont celles dont la vitesse est proportionnelle au produit de trois concentrations. 3, record 4, French, - concentration
Record number: 4, Textual support number: 1 OBS
Voir "concentration". 4, record 4, French, - concentration
Record 4, Spanish
Record 4, Campo(s) temático(s)
- Ciencias biológicas
- Biotecnología
Record 4, Main entry term, Spanish
- concentración
1, record 4, Spanish, concentraci%C3%B3n
correct, feminine noun
Record 4, Abbreviations, Spanish
Record 4, Synonyms, Spanish
Record 4, Textual support, Spanish
Record 5 - internal organization data 2011-01-11
Record 5, English
Record 5, Subject field(s)
- Biological Sciences
Record 5, Main entry term, English
- apparent Km
1, record 5, English, apparent%20Km
correct
Record 5, Abbreviations, English
Record 5, Synonyms, English
- K'm 2, record 5, English, K%27m
correct
- apparent Michaelis constant 2, record 5, English, apparent%20Michaelis%20constant
correct
Record 5, Textual support, English
Record number: 5, Textual support number: 1 DEF
Substrate concentration which gives a reaction velocity corresponding to half the Vmax(app). 1, record 5, English, - apparent%20Km
Record number: 5, Textual support number: 1 CONT
It is recognized that the kinetic constants measured with immobilized enzymes are not true kinetic constants equivalent to those obtained in homogeneous reactions, but are apparent values because of the effects of diffusion and other physical factors.... The Michaelis constant determined for immobilized enzymes is necessarily only an apparent constant (K’m) and should be distinguished clearly from the constant normally determined with the soluble enzyme. 3, record 5, English, - apparent%20Km
Record number: 5, Textual support number: 1 OBS
Km (app) and K’m are abbreviations of apparent Km. 2, record 5, English, - apparent%20Km
Record number: 5, Textual support number: 2 OBS
The term Km should read Km 4, record 5, English, - apparent%20Km
Record 5, French
Record 5, Domaine(s)
- Sciences biologiques
Record 5, Main entry term, French
- constante apparente de Michaelis
1, record 5, French, constante%20apparente%20de%20Michaelis
correct, feminine noun
Record 5, Abbreviations, French
Record 5, Synonyms, French
- Km apparent 2, record 5, French, Km%20apparent
correct, masculine noun
Record 5, Textual support, French
Record number: 5, Textual support number: 1 DEF
Constante empirique égale à la concentration en substrat pour laquelle on a une vitesse égale à la moitié de la vitesse maximale; ce Km ne peut pas être employé pour calculer la vitesse initiale d'un enzyme allostérique, étant donné que le rapport vo/(S) n'est pas une hyperbole rectangulaire, comme l'exigent les postulants et les équations de Michaelis-Menten. Ainsi, un modulateur négatif abaissera la vitesse de la réaction à une concentration fixe, non saturante, de substrat, alors qu'un modulateur positif augmentera cette vitesse. 2, record 5, French, - constante%20apparente%20de%20Michaelis
Record number: 5, Textual support number: 1 CONT
La «constante de Michaelis» d'un substrat est égale à la constante apparente de Michaelis de la réaction dans le sens direct, lorsque le second substrat est saturant. De la même manière, la «constante de Michaelis» d'un produit est égale à la constante apparente de Michaelis de la réaction dans le sens inverse lorsque le second produit est saturant. Les «constantes d'inhibition» du premier substrat et du dernier produit sont les vraies constantes de dissociation correspondant à ce substrat et à ce produit. 3, record 5, French, - constante%20apparente%20de%20Michaelis
Record 5, Spanish
Record 5, Textual support, Spanish
Record 6 - internal organization data 2006-01-17
Record 6, English
Record 6, Subject field(s)
- Architectural Styles
Record 6, Main entry term, English
- neo-classicism
1, record 6, English, neo%2Dclassicism
correct
Record 6, Abbreviations, English
Record 6, Synonyms, English
- classical revival style 2, record 6, English, classical%20revival%20style
Record 6, Textual support, English
Record number: 6, Textual support number: 1 DEF
An aesthetic movement and artistic style which spread through Europe in the second half of the 18th c., combining reaction from Rococo and the excesses of the late Baroque with a new interest in the Antique. 1, record 6, English, - neo%2Dclassicism
Record number: 6, Textual support number: 1 OBS
... differs from previous classical revivals ... by the fact that it was a deliberate and conscious imitation of antique models. 1, record 6, English, - neo%2Dclassicism
Record 6, French
Record 6, Domaine(s)
- Styles en architecture
Record 6, Main entry term, French
- néoclassicisme
1, record 6, French, n%C3%A9oclassicisme
correct, masculine noun
Record 6, Abbreviations, French
Record 6, Synonyms, French
- néo-classicisme 2, record 6, French, n%C3%A9o%2Dclassicisme
correct, masculine noun
Record 6, Textual support, French
Record number: 6, Textual support number: 1 DEF
Formes d'art imitées ou renouvelées de l'Antiquité classique. 1, record 6, French, - n%C3%A9oclassicisme
Record number: 6, Textual support number: 1 CONT
Le néo-classicisme se traduit par un style architectural plus austère, à tout le moins dans les extérieurs [...] 2, record 6, French, - n%C3%A9oclassicisme
Record number: 6, Textual support number: 1 OBS
La phase néo-classique témoigne de l'impact de la redécouverte archéologique de la Rome antique [...] et de la Grèce. 2, record 6, French, - n%C3%A9oclassicisme
Record number: 6, Textual support number: 2 OBS
néoclassicisme : Cette graphie, puisée des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, est attestée dans le Petit Robert (2004). 3, record 6, French, - n%C3%A9oclassicisme
Record 6, Spanish
Record 6, Textual support, Spanish
Record 7 - internal organization data 2001-08-27
Record 7, English
Record 7, Subject field(s)
- General Mechanics (Physics)
- Aircraft Piloting and Navigation
- Navigation Instruments
- Flight Instruments and Equipment (Aeroindustry)
Record 7, Main entry term, English
- angular stiffness
1, record 7, English, angular%20stiffness
correct
Record 7, Abbreviations, English
Record 7, Synonyms, English
Record 7, Textual support, English
Record number: 7, Textual support number: 1 CONT
Momentum wheels are capable of providing gyroscopic stiffness in more than one axis. These wheels provide a nominally constant angular momentum to provide angular stiffness. The mean disturbance torque typically determines the momentum storage of reaction wheels and momentum wheels over one half an orbit. 1, record 7, English, - angular%20stiffness
Record 7, French
Record 7, Domaine(s)
- Mécanique générale (Physique)
- Pilotage et navigation aérienne
- Instruments de navigation
- Instruments et équipement de bord (Constructions aéronautiques)
Record 7, Main entry term, French
- raideur angulaire
1, record 7, French, raideur%20angulaire
correct, feminine noun
Record 7, Abbreviations, French
Record 7, Synonyms, French
Record 7, Textual support, French
Record number: 7, Textual support number: 1 CONT
Dans une même famille de [gyromètres], les grandeurs suivantes sont généralement fixées : moment cinétique; moment d'inertie; débattement. Par contre, la raideur angulaire peut être choisie, pour chaque appareil, dans certaines limites. [...] Le rappel élastique peut être obtenu par voie mécanique ou électrique. 1, record 7, French, - raideur%20angulaire
Record 7, Spanish
Record 7, Textual support, Spanish
Record 8 - internal organization data 1982-03-18
Record 8, English
Record 8, Subject field(s)
- Chemical Engineering
- Water Treatment (Water Supply)
Record 8, Main entry term, English
- half-dechlorination depth
1, record 8, English, half%2Ddechlorination%20depth
correct
Record 8, Abbreviations, English
Record 8, Synonyms, English
Record 8, Textual support, English
Record number: 8, Textual support number: 1 CONT
The pH of the dechlorinated water falls during [the] reaction. This dechlorination action is characterized by the half-dechlorination depth, that is, the depth of the filter bed which, for a given speed, causes the reduction by one half of the amount of chlorine in the water. The pH has considerable influence on this depth. 1, record 8, English, - half%2Ddechlorination%20depth
Record 8, French
Record 8, Domaine(s)
- Génie chimique
- Traitement des eaux
Record 8, Main entry term, French
- longueur de demidéchloration
1, record 8, French, longueur%20de%20demid%C3%A9chloration
correct, feminine noun
Record 8, Abbreviations, French
Record 8, Synonyms, French
Record 8, Textual support, French
Record number: 8, Textual support number: 1 CONT
Le pH de l'eau déchlorée s'abaisse au cours de la réaction. On caractérise cette action déchlorante par la longueur de demidéchloration: c'est la hauteur de lit filtrant qui, à une vitesse donnée provoque une diminution de moitié de la dose de chlore dans l'eau. Le pH a une grande influence sur cette longueur. 1, record 8, French, - longueur%20de%20demid%C3%A9chloration
Record 8, Spanish
Record 8, Textual support, Spanish
Record 9 - internal organization data 1982-03-18
Record 9, English
Record 9, Subject field(s)
- Water Treatment (Water Supply)
Record 9, Main entry term, English
- dechlorinated water
1, record 9, English, dechlorinated%20water
correct
Record 9, Abbreviations, English
Record 9, Synonyms, English
Record 9, Textual support, English
Record number: 9, Textual support number: 1 CONT
The pH of the dechlorinated water falls during [the] reaction. This dechlorination action is characterized by the half-dechlorination depth, that is, the depth of the filter bed which, for a given speed, causes the reduction by one half of the amount of chlorine in the water. The pH has considerable influence on this depth. 1, record 9, English, - dechlorinated%20water
Record 9, French
Record 9, Domaine(s)
- Traitement des eaux
Record 9, Main entry term, French
- eau déchlorée
1, record 9, French, eau%20d%C3%A9chlor%C3%A9e
correct, feminine noun
Record 9, Abbreviations, French
Record 9, Synonyms, French
Record 9, Textual support, French
Record number: 9, Textual support number: 1 CONT
Le pH de l'eau déchlorée s'abaisse au cours de la réaction. On caractérise cette action déchlorante par la longueur de demidéchloration: c'est la hauteur de lit filtrant qui, à une vitesse donnée, provoque une diminution de moitié de la dose de chlore dans l'eau. Le pH a une grande influence sur cette longueur. 1, record 9, French, - eau%20d%C3%A9chlor%C3%A9e
Record 9, Spanish
Record 9, Textual support, Spanish
Copyright notice for the TERMIUM Plus® data bank
© Public Services and Procurement Canada, 2026
TERMIUM Plus®, the Government of Canada's terminology and linguistic data bank
A product of the Translation Bureau
Features
GCtranslate (available on the Government of Canada network only)
Use this artificial intelligence prototype to translate Government of Canada content up to and including Protected B. Available to employees of selected departments and agencies only.
Writing tools
The Language Portal’s writing tools have a new look! Easy to consult, they give you access to a wealth of information that will help you write better in English and French.
Glossaries and vocabularies
Access Translation Bureau glossaries and vocabularies.
- Date Modified:


