Microbial transformation of glycyrrhetinic acid by Cunninghamella blakesleeana Combinatorial microbial transformation of natural antiviral drugs Advance on Research of Ginsenoside CK Microbial transformation on ginsenoside compound K from total saponins in fruit of Panax ginseng Microbial transformation of ursolic acid using Penicillium melinii Microbial transformation of ursolic acid by Penicillium adametzi Application of photosynthetic bacteria biotransformation in research of Chinese materia medica Study of microbial transformation process of Strychnos nux-vomica alkaloid salts by Cunninghamella blakesleeana Induced changes in soil microbial transformation of nitrogen in maize rhizosphere by 4-year exposure to O3