1. Head of Biomedical Engineering Department, Military Technical College, Cairo, Egypt
2. Head of Nanotechnology Research Center, Military Technical College, Cairo, Egypt
3. Biochemistry Department, Faculty of Pharmacy, Ain Shams University, Cairo, Egypt
4. Radiation Biology Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
5. Drug Radiation Research Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt