1. Department of Mechanical Engineering, University of North Texas, University of North Texas Discovery Park, 3940 N Elm St., Denton, TX 76207, USA
2. College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
3. Department of Microbiology, University of Massachusetts, 639 North Pleasant Street, Amherst, MA 01003, USA