Objective To study the influence of oral magnetic field treated spirits for superoxide dismutase(SOD)activity, malonyldialdehyde(MDA)and nitric oxide(NO)level in human body.

Objective To study on the change of the immunoglobulin and superoxide dismutase (SOD) level of the dust- exposed workers and seek for early diagnostic index of pneumoconiosis.

Superoxide dismutase (SOD) is the scavenger of oxygen free radicals.