الفهرس 
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Abstract
Nanomaterial are chemical molecules that have surfaces with at least one dimension smaller than 100 nm.
Cerium, a member of the lanthanide metals, is very reactive and a strong oxidizing agent that is stabilized when associated with an oxygen ligand. Cerium oxide has been used as a polishing agent for glass mirrors, plate glass, television tubes, ophthalmic lenses, and precision optics. Due to the ability of cerium oxide to donate and store oxygen from their crystal lattices, it has been recently used as a diesel fuel borne catalyst in conjunction with a particulate filter to reduce the ignition temperature of the carbonaceous diesel exhaust particles (DEP), resulting to more efficient burning of DEP and the regeneration of the particulate filter . Although cerium oxide substantially decreases both particle mass (>90%) and number (99%) concentrations in the exhaust,
Cerium oxide nanoparticles (CeO2 NPs) have promising industrial and biomedical applications. In spite of their applications, the toxicity of these NPs in biological/physiological environment is a major concern. So in our study we use one of flavonoid group, Quercetin as ameliorative agent to limit this toxic effect.
And are widely distributed in plants. They are found in a variety of foods including apples, berries, Brassica vegetables, capers, grapes, onions, shallots, tea, and tomatoes, as well as.