The learning-memory behavior,the varieties of the activity of superoxide dismutase(SOD),and the content of malonaldehyde(MDA) in pup rats\' brain were investigated.

The result showed that the GSH-Px Activity of tobacco leaves kept relatively high activity, The MDA is lower than the comparison, the selenium content in the leaf tobacco enhances in evidence, the effect of compound selenium is higher than the Na2SeO3 obviously, and it delayed the leaf tobacco to be senile.

By surveying the electrolyte leakage,the dissociated proline,MDA and soluble protein of the one-year-old dormant branch of four specious of color leafed plants under temperature falling,the author found the relationship between these 4 factors and their tolerance to coldness.

The tumor necrosis factor-alpha(TNF-α),interleukin-6(IL-6),superoxide dismutase(SOD)and malondialdehyde(MDA)in the tissue around the hemorrhage were measured at different time point.

varegata seedlings as the material are selected and studied,under different submerged times(3,9,15 and 30 d),the changes of superoxide radical,malondialdehyde(MDA) content and activities of protective enzymes in leaves of control group and 2m-submerged group(2 m beneath water surface).

The protection effects of Radix Ilicis Pubescentis extract at doses of 25,50,100mg·kg-1 were evaluated by investigating cerebral water contents,the activity of superoxide dismutase(SOD) and the content of malondialdehyde(MDA).