摘要：The protective effects of Trolox on the inhibition of negative gravitaxis in Euglena gracilis exposed to 200 Gy 60 Co gamma-rays were examined using different concentrations (1, 10 and 100 μM). The orientation precision of the negative gravitaxis was quantified using the r-value. A significant decrease in the r-value was observed in gamma-irradiated samples (0.18 /-0.03) compared to those of non-irradiated samples (0.47 /-0.03). There were no significant changes in the r-value of cells exposed to 200 Gy gamma-rays by the addition of 1 or 10 μM of Trolox. A significant increase (0.19) in the r-value of cells exposed to 200 Gy with 100 μM Trolox was observed. The results indicates that Trolox at a concentration of 100 μM protects negative gravitaxis against 60 Co gamma-ray irradiation at a dose of 200 Gy. It also suggests that the negative gravitaxis of Euglena gracilis is affected by free radicals.
关键词：Gravity perception; Ionizing radiation; Antioxidant; Free radical; Space radiation
