1. Institute of Microbial PharmaceuticalsCollege of Life and Health SciencesNortheastern University Shenyang 110169 P. R. China
2. Institute of Biochemistry and Molecular BiologyCollege of Life and Health SciencesNortheastern University Shenyang 110169 P. R. China
3. Bioactive Botanical Research LaboratoryDepartment of Biomedical and Pharmaceutical SciencesCollege of PharmacyUniversity of Rhode Island Kingston RI 02881 USA