Catalysis, nanoparticles: hydrogen peroxidePhoto courtesy of Dr. David J. Willock, Cardiff Universityin chemistry, the modification of the rate of a chemical reaction, usually an acceleration, by addition of a substance not consumed during the reaction.
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United States Pharmacopeia. The United States Pharmacopoeia (USP) is a pharmacopoeia (compendium of drug information) for the United States published annually by the United States Pharmacopoeial Convention (usually also called the USP), a nonprofit organization that owns the trademark and copyright.