Abstract: The purpose of the present invention is to provide polymer particles that exhibit antimicrobial properties even in the presence of a salt, and provided are the polymer particles containing a structural unit derived from a cationic polymerization initiator, a main monomer containing a carbon-carbon double bond (excluding a cationic comonomer), and a cationic comonomer containing a carbon-carbon double bond, and satisfying all of the following conditions: (i) a relative permittivity (?r), as an index of surface hydrophobicity, ?24; (ii) a surface charge density (?)?0.5 unit/nm2; and (iii) satisfying the relational formula: Cp?3.0×0.65K, wherein K (?M?1): binding equilibrium constant as an index of affinity with 6-(p-toluidino)-2-naphthalenesulfonic acid sodium salt (TNS), Cp (mg/mL): polymer particle concentration for exhibiting antimicrobial properties.

Abstract: Disclosed is an additive for imparting antimicrobial properties to a resin. The additive comprises a string polymer, at least one terminal of which has a positive charge, wherein the string polymer is a polymer containing structural units derived from a cationic polymerization initiator and a monomer containing a carbon-carbon double bond. By using this additive, it becomes possible to obtain an antibacterial resin molded body which can be prepared simply and inexpensively and which has high stability and safety.

Abstract: Disclosed is an additive for imparting antimicrobial properties to a resin. The additive comprises a string polymer, at least one terminal of which has a positive charge, wherein the string polymer is a polymer containing structural units derived from a cationic polymerization initiator and a monomer containing a carbon-carbon double bond. By using this additive, it becomes possible to obtain an antibacterial resin molded body which can be prepared simply and inexpensively and which has high stability and safety.

Abstract: Disclosed is a yeast strain of Candida utilis, wherein the yeast strain has been transformed with at least one of three genes that are operatively linked to a promoter sequence and encode polypeptides having activities of xylose reductase, xylitol dehydrogenase, and xylulose kinase. The yeast strain is useful for producing a metabolic product from xylose with high efficiency.