Abstract: Novel method for the determination of .alpha.-amylase which method comprises contacting a sample suspected of containing .alpha.-amylase with a starch derivative carrying a substituent capable of dyestuff-forming coupling; separating from the resulting starch-containing phase the low molecular weight soluble fission products formed by splitting of said starch derivative by .alpha.-amylase; coupling the said couplable substituent with another dyestuff forming component; and measuring the dyestuff so formed as a measure of the initial .alpha.-amylase content.

Abstract: Controlled release pesticides are prepared by reacting an isocyanate derivative of a pesticide with a polymer having pendant groups containing a reactive hydrogen to obtain a novel pesticide-polymer system in which the pesticide is chemically bonded to the polymer. Active pesticidal material is released from the pesticide-polymer system by hydrolysis or chemical depolymerization under conditions of use.

Abstract: Pesticide polymers comprising a polymer with a macromolecular backbone and pendant groups having pesticidal groups chemically linked thereto are prepared by reacting a pesticide having a replaceable hydrogen with a multifunctional isocyanate to form a pesticide-isocyanate adduct and then reacting the adduct with the polymer substrate in a mutual solvent to form the pesticide polymers. The chemical linkages connecting the pesticide-adduct to the pendant groups are cleaved under environmental conditions of use to controllably release an effective amount of the active pesticide.

Abstract: A water-insoluble immunological reagent being formed from discrete particles of a latex carrier to which a water-soluble polyhydroxy compound is covalently bound having condensed thereto through a covalent link an immunologically active material; process for the manufacture of said reagent; a kit containing said reagent and the use of said reagent in immunological determinations.

Abstract: Covers an aminated starch derivative prepared by the reductive amination of an oxidized starch by reaction with ammonia or ammonium hydroxide. Also, covers a process of preparing said derivative.

Abstract: Covers an aminated starch derivative prepared by the reductive amination of an oxidized starch by reaction with a dialkyl amine. Also, covers a process of preparing said derivative.

Abstract: A reactive matrix comprises a co-enzyme chemically attached to a water insoluble organic polymeric support material. The reactive matrix may be used in a process for the separation of mixtures containing a plurality of enzymes.

Abstract: Physiologically acceptable particulate radionuclide carriers comprising a reducing agent bound to an anionic starch derivative, useful in the preparation of organ-specific diagnostic radiopharmaceuticals.

Abstract: A reactive matrix comprises a co-enzyme chemically attached to a water insoluble organic polymeric support material. The reactive matrix may be used in a process for the separation of mixtures containing a plurality of enzymes.