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A novel bacterial named AC21 having nitrile-converting activity was gained with acetonitrile as sole source of nitrogen, which was recognized by morphology and 16S rDNA gene sequence as Stenotrophomonas maltophilia. This intracellular nitrilase induced by acetonitrile (0.3%) catalyses the conversion of 3-cyanopyridine to nicotinic acid without noticeable production of nicotinamide. Optimal pH and...