Objective To investigate the cytotoxicity on normal cell lines of cerium nitrate, the inhibitory effect on tumor cell lines and the effect on cell cycle in vitro. Methods The cytotoxicity of cerium nitrate on FL, L929 and inhibition rate on Hela, SGC-7901, B16, Lewis, K562, and H_(22) in vitro were detected with the method of MTT. The effect of cerium nitrate on cell cycle of SGC-7901 was studied by one-fluorescence dying method on flow cytometer. Results Cerium nitrate did not show the toxic activities on FL and L929 cell lines when the dose of cerium nitrate was it could noticeably inhibit the growth and proliferation of tumor cells nitrate inhibited the growth and proliferation of tumer cells including HeLa, SGC-7901, B16 and K562; cerium nitrate had a noticeably inhibitory effect on the growth and proliferation of H_(22) cell lines in vitro on Conclusion Cerium nitrate has the property of low toxicity and high selectivity on normal cells, but it can inhibit growth and proliferation of many kinds of tumor cell lines by adjusting cell cycle.

Objective To investigate the effect of maple syrup on fatigue resistance in mice. Methods Totally forty Kunming mice were divided randomly into normal control group, low-dose maple syrup group (1.25g/kg), medium-dose maple syrup group (2.50g/kg), and high-dose maple syrup group (5.00g/kg). Mice were continuously given water and maple syrup through mouth for 30 days. Various groups swam for 10min. The contents of blood lactic acid were measured at swimming 0min, 10min and resting 30min. The contents of hemoglobin, blood lactic acid, serum urea nitrogen, muscle glycogen, and liver glycogen of various group mice were detected after resting 30min. Results The content of serum urea nitrogen of three maple syrup groups was less than that in normal control group (P