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ion exchange enzyme catalysis michaelis menten equation alkaloids piperic acid black pepper piperine craig method spath method tobacco nicotine chromatography solvent extraction lanthanide separation tolmans's catalytic cycle hydrogention wilkinson's catalyst organometallic catalysts lubricants classification cosmetics face powder perfumes magnesium diagonal relationship beryllium epoxy bakelite classification polymer surfacearea adsorption nodal plane node angular probability function radial probability function quantum numbers steady state principle michaelis constant polymer processing molding blow molding