Characterization of an artificial bifunctional enzyme, beta-galactosidase/galactokinase, prepared by gene fusion..     ///    " An artificial bifunctional enzyme, beta-galactosidase/galactokinase, has been prepared by gene fusion. "    ///    "beta-Galactosidase/galactokinase has different thermostability curves, pH/activity profiles and Km values as compared with the native enzymes. "