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Mamdouh I Nassar
Cairo University, Egypt, Egypt

* Ph.D degree,1995 for pests management, University of Maryland, (USA) and the Cairo University channel system. * Msc. degree in 1989, Biology ,Entomology Department, Faculty of Science, Cairo University. * Bsc. degree, Biology Department, Faculty of Science, Cairo University in 1983. * Professor, Faculty of Science, Cairo University 3/2006. * Assistant Professor, Faculty of Science, Cairo University, 2002. * Associate Professor, Biology Department - Faculty of Science, King Khalid University Saudi Arabia in 2003. * Lecturer at the Faculty of Science, Cairo University in 1995. * Visiting Professor at the University of Maryland 1992-1994m animal science department. * Assistant Lecturer at the Faculty of Science, Cairo University in 1992. * Lecturer in the Faculty of Science, Cairo University in 1984.


Abstract Nanoparticle metal oxides represent a new class of important materials that developed use in researches of medical, biotechnology and microbial prevention. This study clearly demonstrated that Zinc nanoparticles have a wide range of antimicrobial effects. The antibacterial activity of Zinc may be dependent on its size. The data suggest that ZnO2 and ZnN2 nanoparticles were inhibited growth and damage of bacterial cells. The aim of this study was to evaluate antimicrobial activity properties of Zinc doped magnetic prepared in O2 and N2 against Escherichia coli K88 bacteria. Results of this study revealed that ZnO nanoparticles caused inhibition zone diameter before heating by 25, 24, 23, and 22 mm. at nanoparticles concentrations of Zn 0.25% doped in O2, Zn 0.2% in O2, Zn 0.15% in O2 and Zn 0.3% doped in O2 respectively. While ZnN2 nanoparticles produced diameter inhibition of E. coli by 20, 17, 16 and 15mm at nanoparticle concentrations of Zn 0.25% in N2, Zn 0.15% in N2, Zn in N2 and Zn 0.1% & 0.3% respectively. Data showed that Zn doped in O2 and N2 nanoparticles were decreased and prevented growth of E. coli colonies. The most effective prevention was 37% by the effect of Zn 0.2% doped in O2 zone of inhibition diameter increases as the density of the nanoparticles increased. After heating the highest inhibition of zone diameter was 27mm at nanoparticle concentration of Zn 0.25% doped in O2. Also the nanoparticles of Zn 0.2% doped in O2 most produced prevention of E. coli growth colony by 37%. Meanwhile these results concluded there is no clear significant different P ? 0.5 by the effect of ZnO2 and ZnN2 before or after heating. It can be concluded that the results from the premises for future studies on high quality and nanoparticles materials that could be used eventually in various biomedical and microbial prevention applications.

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