大功率电子加速器的辐射灭菌效果研究

在中国科学院近代物理研究所自行研制的大功率电子加速器上, 研究了不同辐照剂量的电子束对大肠杆菌、 金黄色葡萄球菌和变形杆菌3种微生物的杀灭效果, 同时检测了辐照后菌体超氧化物歧化酶（SOD）活性的变化。 结果显示: 辐照剂量达到2.0 kGy时, 可完全杀灭金黄色葡萄球菌, 2.2 kGy时可完全杀灭大肠杆菌和变形杆菌; 辐照对3种微生物的SOD活性有较显著的影响。 To study the effects of radiation sterilization of the electron beam, the three species of microorganisms, Escherichia. coli, Staphylococcus aureus and Proteus vulgaris were irradiated with the electron beam, delivered by the electron accelerator independently developed by the Institute of Modern Physics, Chinese Academy of Sciences, and the changes of superoxide dismutase (SOD) activity of these irradiated microorganisms were also tested. The results indicated that the Staphylococcus aureus were fully radio sterilized with the radiation dosage of 2.0 kGy, but 2.2 kGy to the Escherichia.coli and Proteus vulgaris. Moreover, the data also demonstrated that the irradiation had noticeable effects on the SOD activity of the three microorganisms.     

~(12)C~(6+)离子束辐照紫苏干种子当代效应

利用兰州重离子研究装置(HIRFL)提供的12C6+离子束辐照紫苏干种子(辐照剂量为40,80和120Gy,剂量率4Gy/min),探讨了重离子束辐照对紫苏M1代的生物学效应。结果发现,经不同剂量的12C6+离子束辐照后,紫苏种子的发芽率、发芽势、存活率、株高、分枝数、单株产量和千粒重等生物学性状均发生了变化,其中发芽势、单株产量和千粒重随辐照剂量的提高而降低,且有明显的剂量效应关系,但发芽率、大田成活率、株高和分枝数却随辐照剂量的增大,呈现出明显的"抛物线"趋势;紫苏幼苗根尖细胞的微核率和染色体畸变率随辐照剂量增加呈线性增加关系。这表明:12C6+重离子束辐照紫苏种子,具有明显的当代损伤效应,在本试验剂量范围内,低剂量辐照对发芽率和成活率有促进作用。