When mouse liver cells were irradiated with different doses of UV radiation, the structures and functions of cell mitochondria were found to be effected, dose dependently, to varies degrees. The effects mainly resulted in an increase of degree of lipid peroxidation, and a decrease of the fluidity of mitochondrial membrane and the activity of cytochrome C oxidase. Quercitrin, extracted from the leaves of Ginkgo biloba L. showed a marked protective effect on the function of mitochondria before incubating with...