Abstract: Embodiments of the present disclosure relate to a D-amino acid oxidase mutant and application in preparing L-glufosinate thereof. The D-amino acid oxidase mutant has an amino acid substitution at at least one of position 62 and position 226 of an amino acid sequence of the D-amino acid oxidase mutant when compared to an amino acid sequence of a D-amino acid oxidase as set forth in SEQ ID NO. 1, the position 62 and position 226 being defined with reference to SEQ ID NO. 1, and the amino acid sequence of the D-amino acid oxidase mutant having at least 90% identity to SEQ ID NO. 1.

Abstract: Categorizing products includes: extracting titles for a plurality of products from acquired data; segmenting the titles into phrases; determining respective scores for the phrases; composing a first word sequence for a first one of the plurality of products with at least one of the phrases based at least in part on the determined respective scores for the phrases; comparing the first word sequence to a second word sequence for a second one of the plurality of products; and combining the first one and the second one of the plurality of products into a category of products based at least in part on the comparison.