Key Laboratory of Marine Drugs;
Chinese Ministry of Education;
School of Medicine and Pharmacy;
Ocean University of China;
Qingdao 266003;
P. R. China;
School of Life Science and Biotechnology;
Mianyang Normal University;
Mianyang 621000;
P. R. China;
State Key Laboratory of Microbial Technology;
School of Life Science;
Shandong University;
Jinan 250100;
P. R. China;