1. Department of Chemistry, Faculty of Science, Alexandria University, P.O. Box 426 Ibrahimia, 21321 Alexandria, Egypt
2. Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-41296 Gothenburg, Sweden
3. Deptartment of Microbiology, Faculty of Science, Alexandria University, Alexandria, Egypt
4. Deptartment of Biochemistry, Faculty of Science, Alexandria University, Alexandria, Egypt