1. Center for the Environmental Implications of NanoTechnology, Duke University, Durham, North Carolina, United States
2. Department of Biology, Duke University, Durham, North Carolina, United States
3. Department of Environmental Science, Baylor University, Waco, Texas, United States
4. Center for Reservoir and Aquatic Systems Research, Baylor University, Waco, Texas, United States
5. Department of Biology, Baylor University, Waco, Texas, United States
6. Department of Plant and Soil Sciences, University of Kentucky, Lexington, Kentucky, United States
7. Department of Chemistry, Duke University, Durham, North Carolina, United States