Objective To observe the protective effects of natural antioxidant tea polyphenols(TP) on myocardial free radical metabolic disorder in mice induced by inhalation of hypobaric pure oxygen under 5500 m hypobaric condition. Method Fourty-two male Kunming mice were randomly divided into three groups(n=14 each):group A, normal control; group B, inhalation of pure oxygen(>96%) at simulated altitude of 5500 m in an animal altitude chamber;group C(TP protection group), same as group B but 100 mg/kg of TP was given orally before the exposure. The exposure time was 2 h/d,3 d/wk for a total of 8 wk, and distilled water was given to groups A and B before exposure. After experiment, the mice were decapitated on the next day and the heart was quickly removed. Malondialdehyde(MDA) concentration, superoxide dismutase(SOD) activity and nitric oxide(NO) content were measured. In addition, Cu,Zn-SOD and inducible NO synthase(iNOS) enzymatic contents in myocardial tissue were qualitatively examined by immunohistochemical assaying. Result Compared with the control, MDA concentration, SOD activity and Cu,Zn-SOD enzymatic content in group B were significantly increased(P<0.05).But in TP protection group, myocardial MDA formation was significantly decreased(P<0.01) and SOD activity and Cu,Zn-SOD expression restored to normal. On the contrary, myocardial NO generation and iNOS expression were significantly reduced after repeated inhalation of hypobaric oxygen at 5500 m.NO metabolism regained to normal after repeated administration of TP. Conclusion Natural antioxidant TP had protective effects on myocardial free radical metabolic disorder induced by inhalation of hypobaric pure oxygen under 5500 m hypobaric condition.

OBJECTIVE To discuss the risk factors of professional exposure of dental health personnel and treatment measures. METHODS The management system of standardization,systematization,science and universal prevention were carried out and realized to maximally prevent the onset of dental hospital infection. RESULTS A set of feasible management system and measures about professional exposure for dental health personnel were drafted to make dental staff master the management standards of dental infection,realize the sterilization procedures of dental device and prevent dental infection maximally in dental hospital by implementing universal preventive measures during dental treatment. CONCLUSIONS The preventive measures and programs about professional exposure for dental health personnel must be structuralized.

OBJECTIVE To evaluate the exposing risks among dental staff and improve their concerns for prevention. METHODS By checking and evaluating the various risk factors,including HIV,HBV,HCV,SARS infectious antigens,and mercury contamination in our hospital,we found and formulated effective ways for preventing occupational disease. RESULTS Most dental staff in our hospital effectively decreased the professional exposing risks by practising preventive strategies. CONCLUSIONS Accurate evaluation and practical preventive strategies are key factors to reduce the professional exposing risks for dental staff.