芽孢杆菌产胞外多糖对大肠杆菌的60Co、UVB、低能氮离子的辐射保护作用研究

摘要

该文研究了选自新疆罗布泊沙漠的一株芽孢杆菌所产的胞外多糖(EPS)对大肠杆菌(E.coli)的60Co、UVB、低能氮离子辐射保护作用.选用灰树花多糖和VC做对照,通过大肠杆菌的存活菌落数来计算抗辐射率,进而比较这3种物质对大肠杆菌的辐射保护作用.结果表明:与灰树花多糖和VC相比,EPS具有更加明显的辐射保护作用.低能氮离子注入的存活曲线与60Co、UVB辐射不同,前者呈“马鞍型”曲线,而后两者为指数曲线.%The protection of exopolysaccharide (EPS) produced by Bacillus sp. That isolated from Lop Nur Desert on E. Coli against 60Co, UVB, nitrogen ion implantation radiation was studied. The Maitake polysaccharide and VC were chosen as control. The rate of anti-radiation was calculated by the number of surviving colonies. The protections of the three materials on E. Coli against radiation were compared. It was found that the exopolysaccharide had a higher protective effect than those of the other two agents. The survival curve of nitrogen ion implantation was different from those of the other two agents. The former presented a " saddle shape ", while the latter two were an exponential curve.