Translation of "Chemische spaltung" in English

These collagen fragments can also be obtained by enzymatic or chemical cleavage of type l collagen.

Gelatin is formed from collagen through chemical or enzymatic decomposition and thus has the same chemical composition.

In DE-OS No. 2,322,412 and DE-OS No. 2,449,492 a chemical splitting into the optical antipodes is brought about by salt formation of N,O-diacetyl and N-benzoyl-amino-acid with the aid of (+)-a-phenylethylamine.

This Patent Specification also describes the chemical splitting of optically-active naproxen esters which is carried out by heating for 18 hours at 50° C. with sodium hydroxide in methanol, the yield obtained being from 60 to 70%.

The invention also relates to biologically active peptide cleavage products which are obtainable by chemical or enzymatic cleavage of these polypeptides.

However, preferred alcohols are those whose boiling points are sufficiently different from the boiling point of the 2,2-dialkylpentane-1,5-diisocyanate obtained through subsequent chemical cleavage, so that, on the one hand, very good quantitative separation of the cleavage products diisocyanate and alcohol is possible, and, on the other hand, the 2,2-dialkylpentane-1,5-diurethane formed can be evaporated essentially without decomposition.

The term "hirudin derivative" also comprises fusion proteins with an N-terminal fusion portion which is up to about 50 amino acids long and can be partially or completely deleted by proteolytic or chemical cleavage, resulting in, as a cleavage product, a hirudin derivative of a specific activity of at least 10,000 AT-U/mg.

Fragments obtained by enzymatic or chemical cleavage can be separated according to usual methods such as, for example, HPLC and can themselves be subjected to further N-terminal sequencing.

A fusion protein portion which is present where appropriate can be deleted by proteolytic or chemical cleavage, and the liberated hirudin molecule can be purified.

The chemical degradation by cleavage of ester bonds, which usually takes place very quickly when aqueous polyester dispersions or solutions or polyester-polyurethane dispersions are stored, is not observed with the polyester-polyacrylate dispersions according to the invention.

The chemical degradation by cleavage of ester bonds, which usually takes place when aqueous polyester dispersions or solutions or polyester-polyurethane dispersions are stored, is not observed with the polyester-polyacrylate dispersions according to the invention.

Molded polyurethane articles are made by reacting polyisocyanates with polyol compositions obtained by chemical decomposition of polyurethane and/or polyurea waste in a mold. The polyol compositions employed in this invention have an OH value of from about 100 to about 500 mg KOH/g, a water content of from 0 to about 5 wt. % and a viscosity at 20° C. of more than 2,000 mPa·s.

The widening in the solvent range enables "tailor-made" process conditions for the disposal of the polychlorinated secondary components by incineration or chemical cleavage.

For photometric quantification above 580 nm, substances have already been described in which the dyestuffs are produced by chemical reactions after cleavage of the substrate.

The invention also relates to the novel biologically active peptidic cleavage products which are obtained by chemical or enzymatic cleavage of these polypeptides.

By site-directed mutagenesis it is also possible to introduce specific chemical or enzymatic cleavage sites at the point of linkage of the affinity peptide and the desired recombinant protein, so that after the purification of the fusion protein by means of a suitable affinity resin, the desired recombinant protein can be recovered by chemical or enzymatic cleavage.

However, it is preferred to select alcohols having boiling points sufficiently different than the boiling point of the 2-(alkoxymethyl)-pentane-1,5-diisocyanates obtained by subsequent chemical cleavage, so that quantitative separation of the cleavage products, diisocyanate and alcohol, is possible and the 2-(alkoxymethyl)-pentane-1,5-diurethanes formed may be vaporized without decomposition.

In the case of the second embodiment of the process according to the present invention, as cofactors there are used dextran sulphate, mucopolysaccharide polysulphuric acid esters, pentosan polysulphates or a short-chained heparin derivative produced by the chemical or enzymatic splitting of heparin.

Digestion — a collection of processes that provide mechanical grinding food, chemical cleavage of macromolecules for nutrient components suitable for suction and participate in metabolism.

This linker is then cleaved in vivo under certain conditions, for example by enzymatic or chemical cleavage, and liberates the active compound.

Derivatives of proteins or polypeptides may also be prepared by other methods such as, for example, by chemical cleavage with cyanogen bromide, trypsin, chymotrypsin, papain, V8 protease, NaBH 2, acetylation, formylation, oxidation, reduction or by metabolic synthesis in the presence of tunicamycin.

However, a chemical cleavage of glycosidic bonds does not yet occur, which would be the case in a prehydrolysis process.

The hydrolysis causes the chemical splitting of ingredients, wherein formally hydrogen and hydroxide are added to the respective cleavage product.

The initiation may be initiated, for example, by chemical, or thermal cleavage of peroxide groups or diazo groups on the polymer chain of the graft substrates and also by exposure to radiation.

The use of the inventive compositions for producing casting molds is especially advantageous when the component produced therewith is insoluble and/or non-meltable without chemical cleavage, for example when producing components consisting of crosslinked polymers.