The amylase is one of the most wildely used enzymes. There are lots of studies that have been carried out on the amylase. The gene bla isolated from the strain Bacillus licheniformis, has been employed in lots of the commercial applications. But in the practical application, the enzyme BLA also has some defects. For example: ⑴Although the BLA can tolerate the relative high temperature, its thermostability is limited in many industrial processes;(2)The optimal pH of the BLA is about the 6.0. The enzyme did n...