微量热研究稀土离子对大肠杆菌的作用  

Study of influences of rare earth ions on Escherichia Coli by microcalorimetry

作　　者：胡善洲[1] 刘鹏[1] 李曦[1] 

机构地区：[1]武汉理工大学理学院,430070

出　　处：《华中师范大学学报（自然科学版）》2009年第1期96-99,107,共5页Journal of Central China Normal University：Natural Sciences

基　　金：国家自然科学基金项目(5020310;50702040)

摘　　要：用微量热法研究Y^(3+)、Tm^(3+)、Yb^(3+)这3种稀土离子在不同剂量下对大肠杆菌的作用,得出相应的代谢热曲线.在低浓度稀土离子的作用下,细菌生长的速率加快、停滞期缩短、最大放热功率增加,说明细菌的生长受到了刺激;在稀土离子高浓度的时候,细菌生长的速率减慢、停滞期延长、最大放热功率减小,说明细菌的生长受到了抑制.对比Y^(3+)、Tm^(3+)、Yb^(3+)3种稀土离子,可以看到其生物无机效应与其离子半径有着密切的关系,即离子半径越小,生物无机效应就越显著.The Action of different amount of Y^3＋, Tm^3＋ and Yb^3＋ on E. coli was studied by microcalorimetry, and the metabolic thermal curves were obtained. Low concentration of rare earth cause the increasing of the maximum heat production and growth rate constants, indicating that low concentration of rare-earths ion has stimulative action on them. High concentration of rare earth cause the decreasing of the maximum heat production and growth rate constants, indicating high concentration of rare earth may inhibit growth of bacteria. By comparing Y^3＋ , Tm^3＋ , Yb^3＋ with each other, it can be observed that bioinorganic effect has the close relationship with the ion radii. Smaller ion radii cause stronger action.

关 键 词：稀土污染 生物效应 代谢热 微量热法 抑制 

分 类 号：O642.1[理学—物理化学]