* Corresponding authors

^a Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, Shandong Key Laboratory of Biochemical Analysis, Key Laboratory of Analytical Chemistry for Life Science in Universities of Shandong, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China

^b CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediati-on, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong 264003, P. R. China
E-mail: jwding@yic.ac.cn, wqin@yic.ac.cn
Fax: +86 535 2109000
Tel: +86 535 2109156

^c Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Shandong 266237, P. R. China

^d Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, Shandong, P. R. China