1. Laboratory for Applied Physical Chemistry, Ghent University, Coupure Links 653, B-9000 Gent, Belgium (E-mail: stijn.wyffels@rug.ac.be)
2. Laboratory for Applied Physical Chemistry, Ghent University, Coupure Links 653, B-9000 Gent, Belgium (E-mail: pascal.boeckx@rug.ac.be)
3. Laboratory for Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Gent, Belgium (E-mail: kris.pynaert@rug.ac.be)
4. Institute of Applied Ecology, Chinese Academy of Sciences, Wenhua Road 72, Shenyang, China (E-mail: danzhang@iae.ac.cn)
5. Laboratory for Applied Physical Chemistry, Ghent University, Coupure Links 653, B-9000 Gent, Belgium (E-mail: oswald.vancleemput@rug.ac.be)
6. Institute of Applied Ecology, Chinese Academy of Sciences, Wenhua Road 72, Shenyang, China (E-mail: gxchen@iae.ac.cn)
7. Laboratory for Microbial Ecology and Technology, Ghent University, Coupure Links 653, B-9000 Gent, Belgium (E-mail: willy.verstraete@rug.ac.be)