1. MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences Lanzhou University Lanzhou, Gansu 730000 China
2. National Research Center for Conservation of Ancient Wall Paintings and Earthen Sites, Department of Conservation Research Dunhuang Academy Dunhuang Gansu 736200 China
3. Department of Chemistry Tsinghua University Beijing China
4. College of Life Science Northwest University Xi'an, Shaanxi Province 710069 China
5. International School for Optoelectronic Engineering Qilu University of Technology (Shandong Academy of Sciences) Jinan 250353 China