摘要
分离到的1株真菌月状旋孢腔菌(Cochliobolus lunatus)Cd7,可在2 000 mg L-1镉(Cd2+)液体培养液中存活,显示菌株具有较强的抗镉能力.吸附实验结果表明,菌丝球投加量为2 g L-1时,无论菌丝球灭活与否,菌株对Cd2+的吸附率随Cd2+浓度的升高而下降,吸附量随Cd2+浓度的升高而增加.当Cd2+浓度100 mg L-1以下时,灭活菌丝球对Cd2+的吸附量为活菌丝球的70%以上.菌丝球投加量为0.5-3.0 g L-1,菌株对Cd2+的吸附率随菌丝球投加量增加而增加,吸附量随菌丝球投加量的增加而急剧减少.pH 6.0、金属离子浓度为100 mg L-1时,菌丝球对单一Cd2+、Pb2+、Cu2+和Zn2+离子的平均吸附量顺序为:Cd2+>Zn2+>Cu2+>Pb2+.金属离子的共存抑制菌体对各离子的吸附,离子种类越多,抑制作用越明显.
A strain of Cochliobolus lunatus with high cadmium resistance was isolated and found to survive in liquid medium containing 2 000 mg L^-1 cadmium. Results showed with 2 g L^-1 mycelial pellets, the adsorption rates of Cd~+ decreased with the increasing Cd concentration, but the adsorption quantity increased with the increase of Cd concentration. Inactivated myceliums could adsorb 70% more Cd than living ones when Cd was less than 100 mg Ll. When mycelial pellets was added in the range of 0.5-3.0 g L^-1, the adsorption rates of Cd^2+ increased with the increasing mycelial pellets, but the adsorption quantity decreased sharply. Mycelial pellets showed different adsorption ability for different metals with the order of adsorption quantity of Cd^2+ 〉 Zn^2+ 〉 Cu^2+ 〉 Pb^2+ when single metal was in the concentration of 100 mg L^-1 at pH 6.0. Co-existence of different metals inhibited the absorption of metallic ions by mycelial pellets, the more ion species, the more obvious the inhibition. Fig 3, Tab 2, Ref23
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2013年第4期694-698,共5页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金项目(40901129)资助~~
关键词
镉污染
重金属抗性
月状旋孢腔菌
生物吸附
cadmium pollution
heavy metal resistance
Cochliobolus lunatus
biosorption