Mutagenesis of Rhodosporidium toruloides using ethyl methanesulfonate for enhancing astaxanthin production and evaluation scavenging activity against 2,2-diphenyl-1-picrylhydrazyl of astaxanthin - Tuyet Nhung, Tran Thi; Ngo, Dai Nghiep (VNUHCM Journal of Advanced Research in Natural Sciences, 2021)