TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

Record number: 1, Textual support number: 1 CONT

Application of a weak exchanger in the last step is highly efficient from the economical point of view; however a much deeper deionisation can be achieved with a mixed bed column as the last step of the multi-column system.... The deepest degree of deionisation can be obtained with a single column containing an intimate mixture of cation and anion exchanger beads, called the mixed bed.  1, fiche 1, Anglais, - mixed%20bed%20column

Fiche 1,  Justifications,  Français

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 DEF

An exchanger containing cations which are exchangeable for other cations present in the solution.  2, fiche 2, Anglais, - cation%20exchanger

Record number: 2, Textual support number: 1 OBS

The term cation-exchanger resin may be used in the case of solid organic polymers.  2, fiche 2, Anglais, - cation%20exchanger

Record number: 2, Textual support number: 2 OBS

The early cation exchangers were naturally occurring zeolites but these have been almost completely superseded by the synthetic organic ion exchangers. The synthetic cation exchangers are classified into two main groups, the weak cation exchangers and the strong cation exchanger. In the former the main functional groups are carboxylic acid groups and in the latter they are sulphonic acid groups.  4, fiche 2, Anglais, - cation%20exchanger

Fiche 2,  Justifications,  Français

Record number: 2, Textual support number: 1 DEF

Échangeur d'ions dont les contre-ions sont des cations.  3, fiche 2, Français, - %C3%A9changeur%20de%20cations

Record number: 2, Textual support number: 1 OBS

L'expression résine échangeuse de cations peut être utilisée dans le cas de polymères organiques solides.  3, fiche 2, Français, - %C3%A9changeur%20de%20cations

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

Record number: 3, Textual support number: 1 OBS

A primary grouping of ion exchangers... must include a strong cation and as strong anion and may include a carboxyl exchanger and a weak anion;...  1, fiche 3, Anglais, - carboxyl%20exchanger

Fiche 3,  Justifications,  Français

Record number: 3, Textual support number: 1 OBS

Une chaîne primaire d'échangeurs d'ions comporte obligatoirement un cation fort et un anion fort, et éventuellement une carboxylique et un anion faible [...]  1, fiche 3, Français, - carboxylique

Fiche 3,  Justifications,  Espagnol

Fiche 4,  Justifications,  Anglais

Record number: 4, Textual support number: 1 DEF

Substituted cellulose derivative that is used in bead form as weak ion exchanger. The most frequently used products are DEAE-cellulose(diethylaminoethyl) and CM-cellulose(carboxymethyl), which are weak base(anion) and weak acid(cation) exchangers, respectively. They are prepared from cellulose by substitution of some primary and secondary hydroxyl groups of the anhydroglucose units with diethylaminoethyl or carboxymethyl groups, respectively, joined through ether linkages.  1, fiche 4, Anglais, - cellulose%20ion%20exchanger

Record number: 4, Textual support number: 1 CONT

Ion exchange celluloses can be used in both column and batch processes, although for large-scale work difficulty has been encountered in using large columns of these materials. The cellulose is easily compressed, and this leads rapidly to a reduction in flow rate. Thus the main application of ion exchange cellulose in large-scale enzyme purification has been for batch adsorption and batch elution.  3, fiche 4, Anglais, - cellulose%20ion%20exchanger

Record number: 4, Textual support number: 1 OBS

These exchangers have an open structure, which is readily penetrated by large molecules, and a large surface area giving them a high capacity for absorption of protein. The binding is usually freely reversible. DEAE-cellulose is used for chromatography of acidic and slightly basic proteins at pH values above their isoelectric point. The most useful range is pH 6-8. CM-cellulose is used for separation of neutral and basic proteins, which bind at around pH 4.5. Desorption of proteins from the ion exchangers is accomplished by changing the pH or increasing the ionic strength of the eluant.  1, fiche 4, Anglais, - cellulose%20ion%20exchanger

Fiche 4,  Justifications,  Français

Record number: 4, Textual support number: 1 CONT

L'industrie biologique utilise aujourd'hui les techniques chromatographiques pour la production de protéines purifiées. L'insuline par exemple, est isolée à partir de pancréas de bovins ou de porcs par des procédés combinant l'échange d'ions et le tamisage moléculaire. Ces mêmes techniques ou la chromatographie d'affinité sont également utilisées pour la purification de macromolécules nécessaires à certains vaccins : le virus poliomyélitique, la toxine du choléra et la tixine du tétanos. Ce développement (...) commence vraiment en 1956 avec la création des celluloses échangeuses d'ions par Peterson et Sober, utilisables dans la séparation des protéines.  1, fiche 4, Français, - cellulose%20%C3%A9changeuse%20d%27ions

Fiche 4,  Justifications,  Espagnol