1. Environmental Science and Engineering Ph.D. Program, The University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States
2. University of California Center for Environmental Implications of Nanotechnology (UC CEIN), The University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States
3. Department of Chemistry and Biochemistry, The University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States
4. Texas A&M AgriLife Research and Extension Centre at Dallas, 17360 Coit Road, Dallas, TX-75252, United States
5. Connecticut Agricultural Experiment Station, 123 Huntington Street, New Haven, Connecticut 06511, United States
6. Department of Biology, Western Kentucky University, Bowling Green, Kentucky 42101, United States