沼泽红假单胞菌去除镉的研究  

Study on Removal of Cadmium by Rhodopseudomonas palustris

作　　者：白红娟[1,2] 张肇铭[1] 贠妮[3] 杨官娥[1] 王玉芬[4] 

机构地区：[1]山西大学生命科学与技术学院 [2]中北大学环境与安全工程系太原030051 [3]中北大学环境与安全工程系 [4]东北大学环境与土木工程学院

出　　处：《微生物学通报》2007年第4期659-662,共4页Microbiology China

基　　金：国家科技攻关计划项目(No.2001BA540C)

摘　　要：研究了沼泽红假单胞菌(Rhodopseudomonas palustris)S菌株的生长、Cd2+的去除与供氧光照、碳源、pH及温度的关系。结果表明:在好氧黑暗、苹果酸为碳源、pH7.0和30℃条件下,S菌株对初始浓度为25mg/L的Cd2+去除率最大,达到85%。在最佳条件下,Cd2+初始浓度为10mg/L^25mg/L时,去除率达85%,Cd2+浓度增加到150mg/L时,去除率仅为23%。测定Cd2+在菌体不同部位的分布发现菌体中富集的Cd2+63.5%在细胞壁上,33.5%在细胞原生质体内。同时,结合该菌体细胞超薄切片透射电镜观察证明了S菌株对Cd2+的去除主要在细胞壁上。The influences of oxygen supply and illumination, carbon sources, pH and temperature on the growth of Rhodopseudomonas palustris S stain and removal for cadmium were studied. The results showed that the removal rate in presence of 25mg/L of cadmium was the highest, reaching 85%, under oxygen supply and dark, carbon source with malic acid, pH = 7.0 and temperature at 30%. Under the optimal condition, the removal rate reached 85% in presence of 10mg/L - 25mg/L of cadmium, while it was only 23% in presence of 150mg/L of cadmium. The distribution analysis of Cd^2＋ in different fractions of cell showed that 63.5% of Cd^2＋ was on cell wall and 33.5% of Cd^2＋ was in protoplast. Simultaneity, transmission electron microscopy photos of cell ultra thin section revealed that the removal of cadmium ions was mainly completed on cell wall.

关 键 词：沼泽红假单胞菌 镉 去除 

分 类 号：X172[环境科学与工程—环境科学]