摘要:
A sampling device comprising an electrolyte channel (22) for an electrolyte buffer, a supply (23) and opposite thereto a drain channel (24) for a sample, wherein said supply and drain channels each are inclined to said electrolyte channel, and which supply and drain channels intersect said electrolyte channel at supply (25) and drain ports (26), respectively, such that a geometrically defined sample volume (27) is defined by a section of said electrolyte channel located between said supply port and drain port, which sampling device further comprises means for electrokinetically injecting a sample in said geometrically defined sample volume, characterized in that said supply (25) and drain ports (26) are spaced apart from each other longitudinally along the electrolyte channel and form said sample-volume (27). The sampling device is used for electrokinetic sample introduction and capillary electrophoretic separation.
摘要:
Tanned leather is (a) pretreated in an aqueous and alkaline medium either with ammonia, primary amines or a mixture of ammonia and primary amines and then with a polyfunctional organic compound containing at least one aldehyde group as a functional group, or (b) in an aqueous and acidic medium with a polyfunctional organic compound and then ammonia, primary amines or a mixture of ammonia and primary amines, and (c) then dyed in an aqueous and alkaline medium with a water-soluble dye containing at least one functional group which is capable of reacting with one of the functional groups of the organic compound, forming a covalent bond. A tanned and dyed leather is obtainable with a high colour intensity, outstanding wet fastness and excellent grain tightness, wherein the dye is permanently and covalently bonded to the leather via a bridging group, preferably in the region of the surface, and the bridging group is essentially bonded to the leather via -N=CH- groups.
摘要:
Compounds of the formula (I) and (Ia) in the form of racemates, mixtures of diastereomers or in essentially enantiomerically pure form, (I), (Ia), where R is hydrogen, C1-C8alkyl, C5-C12cycloakyl, phenyl or phenyl substituted by from 1 to 3 C1-C4alky or C1-C4alkoxy groups; n is 0 or an integer from 1 to 4 and R1 are identical or different subtitutuents selected from the group consisting of C1-C4alkyl, C1-C4fluoroalkyl and C1-C4alkoxy; X1 and X2 are each, indenpendently of one another, secondary phosphino; T is C6-C20arylene or C3-C16heteroarylene; and X2 is bound in the ortho position relative to the T-cyclopentadienyl bond. The compounds are ligands for complexes of metal selected from transition groups (I) and (VIII) of the Periodic Table of the Elements, and these metal complexes are valuable catalysts for the asymmetric addition of hydrogen, boron hydrides or silanes onto carbon-carbon or carbon-heteroatom multiple bonds in prochiral organic compounds or the asymmetric addition of carbon nucleophiles or amines onto allyl compounds.
摘要:
A sampling device comprising an electrolyte channel (22) for an electrolyte buffer, a supply (23) and opposite thereto a drain channel (24) for a sample, wherein said supply and drain channels each are inclined to said electrolyte channel, and which supply and drain channels intersect said electrolyte channel at supply (25) and drain ports (26), respectively, such that a geometrically defined sample volume (27) is defined by a section of said electrolyte channel located between said supply port and drain port, which sampling device further comprises means for electrokinetically injecting a sample in said geometrically defined sample volume, characterized in that said supply (25) and drain ports (26) are spaced apart from each other longitudinally along the electrolyte channel and form said sample-volume (27). The sampling device is used for electrokinetic sample introduction and capillary electrophoretic separation.
摘要:
Curable mixtures based on epoxy resins and amine hardeners, if required additionally using solvents, water, plasticisers, UV stabilisers, colourants, pigments, fillers, which mixtures contain as accelerator at least one compound of general formula (I), wherein R?1, R2, R3, R4¿ are each independently of one another H or an unbranched or branched alkyl radical containing 1 to 15 carbon atoms, and n is 0 to 10.