1. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA
2. Institute of Integrative Biology, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich, Switzerland
3. Institute of Biogeochemistry and Pollutant Dynamics, Swiss Federal Institute of Technology Zurich (ETH Zurich), Zurich, Switzerland
4. Department of Environmental Microbiology, Swiss Federal Institute of Aquatic Science and Technology (Eawag), Dübendorf, Switzerland
5. Department of Biological Sciences, Columbia University, New York, NY, USA