Application of Pichia pastoris Original Constitutive Strong Promoter GCW14 in Candidn antarctic Lipase B Yeast Surface Display Display of Functionally Active Lipases on the Escherichia coli Cell Surface Construction of Pichia pastoris Surface Display Technology as Whole -cell Biocatalyst for Thymidine Phosphorylase Optimization of the Synthesis of Alkyl Glucoside Catalyzed by Aspergillus aculeatus β-glucosidase-displaying Pichia pastoris Whole-cells Screening of Promoter-Binding Factors of Tobacco PMT Gene Using a Modified Yeast Surface Display System