Abstract: A dental carrier comprises a thermoplastic carrier. The thermoplastic carrier has a pattern structure. After heating the thermoplastic carrier, the thermoplastic carrier is provided with a user to be impressed by teeth or alveolar ridge for forming teeth or alveolar ridge model of the user. Compared to the prior art, the dental carrier of the present invention can provide the dental medicament contained in the pattern structure to be precisely applied and hold onto the treatment area and the medicament can be evenly coated on the teeth, root, or periodontal tissue for the treatment of teeth. When the dental carrier is not used to carry medicament, the pattern structure can improve the mechanical strength and fitness of the dental carrier to be used as a biteplate, orthodontic retainer, periodontal dressing for treatment or protection or mouth guard in sports.

Abstract: The present invention relates to mutant D-amino acid aminotransferase, including nucleic acids encoding mutant D-amino acid aminotransferase. The mutant D-amino acid aminotransferase of the present invention is obtained by the substitution of the glutamate residue at position 13 of wild type D-amino acid aminotransferase from Bacillus sphaericus with hydrophobic amino acids. The mutant D-amino acid aminotransferase can be used in the production of D-amino acid and the conversion of glutaryl-7-aminocephalosporanic acid from cephalosporin C. The present invention also includes replica-paper staining method for screening the cells expressing high DAT activity.