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Fiche 1,  Justifications,  Anglais

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Azoic dyeing is a technique in which an insoluble azo dye is produced directly onto or within the fiber. This is achieved by treating a fiber with both diazoic and coupling components. With suitable adjustment of dyebath conditions the two components react to produce the required insoluble azo dye.  2, fiche 1, Anglais, - azoic%20dyeing

Fiche 1,  Justifications,  Français

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 CONT

azo dye : A moderately transparent dye which may be made optically dense by the reaction or coupling of a diazo and coupler. Exposure to light may make the dye incapable of coupling in proportion to the exposure received.  2, fiche 2, Anglais, - coupling

Fiche 2,  Justifications,  Français

Record number: 2, Textual support number: 1 DEF

Combinaison d'un diazoïque avec un phénol ou une amine.  3, fiche 2, Français, - copulation

Record number: 2, Textual support number: 1 CONT

Le diazoïque pourra [...] se combiner avec des corps chimiques appelés «copulants» pour donner des molécules colorées plus grosses. Cette réaction s'appelle le développement ou la copulation.  2, fiche 2, Français, - copulation

Fiche 2,  Justifications,  Espagnol

Record number: 2, Textual support number: 1 DEF

Condensación de un compuesto diazoico sobre un fenol o una amina aromática; es una de las reacciones más importantes de la química orgánica, pues se traduce por la formación de colorantes azoicos.  1, fiche 2, Espagnol, - copulaci%C3%B3n

Fiche 3,  Justifications,  Anglais

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Procedure based on the formation of a diazo linkage between enzyme proteins and aryldiazonium electrophilic groups on the insoluble support. Supports containing aromatic amino groups are treated with sodium nitrite in acidic solutions and the resultant activated support reacts with aromatic residues such as the phenolic residue of L-tyrosine or the imidazole residue of L-histidine to give azo derivatives.  1, fiche 3, Anglais, - diazotization

Record number: 3, Textual support number: 1 CONT

There are many commercial diazonium salts used as azo coupling reagents, which are usually in a stabilized form(a stable diazotate) produced by reaction with alkali(forming the free base) or with zinc chloride(forming a diazo double salt)... Diazonium ions are weak electrophiles; they react with highly reactive aromatic compounds-with phenols and tertiary aromatic amines-to yield azo compounds... Azo coupling of proteins can be effected by polymers containing aryldiazonium functional groups... Monomers containing aromatic nitro groups grafted onto polymers have been reduced, diazotized, and used to immobilize enzymes.  3, fiche 3, Anglais, - diazotization

Fiche 3,  Justifications,  Français

Record number: 3, Textual support number: 1 CONT

Bien avant que l'on ne songeât à immobiliser des enzymes à des fins industrielles, on savait [...] immobiliser les protéines que sont les anticorps, par diazotation, sans leur faire perdre leur activité biologique. Ce sont les développements de ces techniques qui ont permis l'apparition du génie enzymatique.  2, fiche 3, Français, - diazotation

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Parmi les supports activés de cette manière, le p. aminobenzoylcellulose ou le verre sont fréquemment employés.  3, fiche 3, Français, - diazotation

Fiche 3,  Justifications,  Espagnol

Fiche 4,  Justifications,  Anglais

Record number: 4, Textual support number: 1 CONT

A direct method to visualise the aryl acylamidase activity on cholinesterases in polyacrylamide gels. ... The o-nitroaniline liberated from o-nitroacetanilide by the action of aryl acylamidase activity on cholinesterases, in the presence of nitrous acid formed a diazonium compound.  2, fiche 4, Anglais, - diazonium%20compound

Record number: 4, Textual support number: 2 CONT

Strictly speaking, diazo compounds are not dyes, but dye precursors. Some azo dyes are manufactured by coupling a phenol or naphthol to a diazonium compound.  3, fiche 4, Anglais, - diazonium%20compound

Fiche 4,  Justifications,  Français

Record number: 4, Textual support number: 1 OBS

diazonium : Nom générique des cations donnés par les diazoïques. Se dit aussi des sels correspondants. Ex. : chlorure de benzène-diazonium.  2, fiche 4, Français, - compos%C3%A9%20diazonium

Fiche 4,  Justifications,  Espagnol