1. European Synchrotron Radiation Facility (ESRF), BP 220, 38043 Grenoble Cedex, France
2. Department of Chemistry, Environmental Science and Engineering Ph.D. Program, University of California Center for Environmental Implications of Nanotechnology (UCCEIN), The University of Texas at El Paso, El Paso, Texas 79968, United States
3. Stockbridge School of Agriculture, University of Massachusetts, Amherst, Massachusetts 01003, United States
4. Department of Life Sciences, University of Parma, 43124 Parma, Italy
5. Agricultural Research Service (ARS), United States Department of Agriculture (USDA), New Orleans, Louisiana 70124, United States