Abstract: Process for the production of a protein with citrate lyase activity by expressing a suitable plasmid in a host organism and isolating the protein in an active form, wherein the plasmid contains the information from a gene cluster composed of at least six genes and an inducible promoter. Furthermore the invention concerns the use of the recombinant enzyme and a corresponding test kit for the determination of citric acid.

Abstract: Compounds which, in one of the possible tautomeric forms, correspond to the general formula I ##STR1## where n is 1 or 2 and, if n is 1, R is unsubstituted or substituted aryl or heteroaryl or, if n is 2, R is a bridge member, and the rings A and B can be further substituted, are outstanding colorants for surface coatings, printing inks or plastics.

Abstract: Thermally stable lead chromate pigments or pigments containing lead chromate, which have high color strength and are provided with a precipitated coating containing silicon dioxide, are prepared by a process in which an aqueous pigment suspension is mixed once or several times with an aqueous MgSiF.sub.6 solution, the pH being maintained at 4.5-9.5 and the temperature at 50.degree.-95.degree. C., and the pigment is then separated off and worked up, these steps being carried out in a conventional manner.

Abstract: A pigment of the formula: ##STR1## wherein each of the rings A, B and C independently is unsubstituted or is substituted by one, two or three radicals which do not confer solubility, or the ring A can additionally carry a fused ring. The novel compounds of the invention are useful as pigments for coloring, printing inks, plastics, and, especially, surface coatings.

Abstract: Compounds of the formula ##STR1## in which K is ##STR2## Ar.sup.1 is phenyl; phenyl substituted by chlorine, methoxy, ethoxy, methyl, acetylamino or benzoylamino; or ##STR3## Ar.sup.2 is phenyl; or phenyl substituted by chlorine, methyl or sulfamoyl,T.sup.1 is methyl or carbamoyl,T.sup.2 is cyano or carbamoyl,Z is hydrogen, chlorine, bromine or trifluoromethyl,Z.sup.1 is hydrogen, chlorine, or bromine, andR is phenyl; phenyl substituted by chlorine, bromine, hydroxy, methoxy, ethoxy, C.sub.1 to C.sub.4 alkyl, cyano, carbamoyl, nitro, phenyl, sulfamoyl, N-phenylsulfamoyl, acetylamino or benzoylamino; naphthyl; N-phenylphthalimidyl; or pyridyl.These compounds are dyes having mostly pigmentary character and are eminently suitable for coloring printing inks, surface coatings and resins.

Abstract: Pigment compositions including nickel titanium yellow or chromium titanium yellow as an inorganic component together with an organic pigment component impart better gloss and/or hiding power to organic coatings containing 10% or more of the compositions if the compositions are prepared by subjecting a suspension of the components in a liquid medium to intense shearing stresses and thereafter separating the mixed pigments from the medium.

Abstract: Mixed pigments containing an organic pigment component and an inorganic pigment component imparting improved gloss and other desirable properties to organic coatings containing the same in relatively large amounts are prepared by synthesizing the organic component in the presence of the inorganic component in a liquid medium inert to the inorganic component, such as nickel titanium yellow or chromium titanium yellow.

Abstract: Dyes of the formula I ##STR1## in which A is phenyl or phenyl substituted by chloro, bromo, nitro, methyl, ethyl, methoxy or ethoxy; B.sup.1 is hydrogen, chloro, bromo, nitro, methyl or trifluoromethyl; B.sup.2 is hydrogen, chloro, bromo or nitro; R is C.sub.1 to C.sub.4 alkyl; and X is hydrogen, chloro or bromo. The compounds are distinguished by high color strength, brilliance and good fastness properties such as light-fastness, fastness to overspraying, plasticizers fastness and insolubility in most solvents used in connection with pigments. They are particularly suitable for the coloring of air-drying surface coatings, rigid polyvinyl chloride and emulsion paints.

Abstract: Compounds of the formula ##STR1## in which K is the radical of a coupling component;X is hydrogen, chloro, bromo, methyl or nitro; andY is hydrogen, chloro, bromo or methyl.The compounds are eminently suitable as pigments for coloring printing inks, surface coatings and resins with exceptional fastness properties.

Abstract: Uniformly dyed water-swellable cellulosic fibers obtained by dyeing cellulosic fibers, in the swollen state, with a dye of the formula ##STR1## where D is a radical of a diazo component of the aniline, aminoazobenzene, aminophthalimide, aminonaphthalimide, anthraquinone or benzanthrone series, R is alkyl of 1 to 4 carbon atoms or phenyl which is unsubstituted or substituted by chlorine, bromine, methyl, methoxy or ethoxy and R.sup.1 is phenyl which is unsubstituted or substituted by chlorine, bromine, methyl, ethyl, methoxy, ethoxy, benzyloxy, phenoxy, chlorophenoxy, unsubstituted or N-substituted carbamoyl or sulfamoyl, unsubstituted or N-substituted phthalimidyl, alkoxycarbonyl of 1 to 8 carbon atoms, cyano or phenylsulfonyl.

Abstract: Azo pigments derived from 2-hydroxy-3-carboxy-naphthalene and containing a substituted or unsubstituted phthalimide radical. The majority give red colorations and due to their excellent fastness properties are particularly valuable for use in surface coatings and resins.

Abstract: Azo pigments having 2,6-dihydroxy-4-methyl-3-cyanopyridine or 2,6-dihydroxy-4-methyl-3-carbamolpyridine as coupling component and a heterocyclic substituted aniline as diazo component. The pigments have the formula ##SPC1##In whichR is cyano or carbamoyl;A is an unsubstituted or substituted benzene ring; andB is a heterocyclic ring which is fused with the benzene ring and which contains at least one --NH-- and --CO-- or at least one --NH--CO-- group. Compounds of this formula as pigments are eminently suitable for coloring printing inks, surface coatings and resins.