الفهرس 
Introduction………………………………………………................................................Only 14 pages are availabe for public view
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Abstract
The current study aimed at preparing CuO and ZnO nanoparticles that can be used as alternative effective, ecofriendly and economic insecticides against the 4th instar of Schistocereca gregaria as model insect and monitoring physiological, biochemical and ultra structural changes resulted after treatments with the prepared CuO and ZnO nanoparticles.
Standard procedures were followed to synthesize CuO NPs and ZnO NPs via chemical precipitation method and calcination method respectively. The formation of ZnO and CuO nanoparticles were investigated and confirmed by instrumental analysis and physical measurements such as Ultra violet-visible Spectrophotometer (UV-Vis), Fourier-Transform Infrared (FTIR), X-Ray diffraction analysis, Energy Dispersive X-ray (EDX),Scanning Electron Microscope (SEM), Dynamic light scattering (DLS) and Transmission Electron Microscope Imaging (TEM).
The size distribution of CuO nanoparticles was around 35 nm the actual size of nanoparticles was estimated from the TEM micrograph. Most of the nanoparticles have an avarege size of 20 nm and are nearly uniform in size.
The surface area measured by BET showed that the surface area of CuO NPs is 23m2/g.
The TEM data of ZnO NPs showed that more than 50% of particles were in range (7 nm up to 35 nm) and the largest percentage was at a size of 35nm. Also the particles are found to be spherical. The surface area measured by BET showed that the surface area of ZnO NPs is 28 m2/g.
Toxicological investigations
The insecticidal efficacy of synthesized ZnO NPs and CuO NPs against the 4th instar of Schistocerca gregaria was demonstrated after 7 days of exposure to different concentrations. The two used compounds stated satisfying toxicity levels. CuO NPs achieved highly toxicity compared with ZnO NPs throughout the study and examination days. where the results were