1. Nanoscale Science Program, Department of Chemistry, University of North Carolina Charlotte, Charlotte, North Carolina 28223, United States
2. Nanotechnology Characterization Laboratory, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research Sponsored by the National Cancer Institute, Frederick, Maryland 21701, United States
3. Department of Pharmacology, Penn State College of Medicine, Hershey, Pennsylvania 17033, United States
4. Department of Biological Sciences, University of North Carolina Charlotte, Charlotte, North Carolina 28223, United States
5. Department of Biochemistry & Molecular Biology, Department of Biochemistry & Molecular Biology, Penn State College of Medicine, Hershey, Pennsylvania 17033, United States