Biological effect of-Non-Ionizing radiations on Microorganism

以多核草履虫为模型细胞，研究了60 Hz磁场对其游泳行为的影响。当暴露在0.6T的垂直磁场中时，细胞在试管的上端积累。对游泳行为的分析表明，暴露在电场中的细胞在暴露开始后1分钟最大限度地增加了向上游泳的细胞数量。磁场的这种影响是暂时的，在暴露期间几分钟内就消失了。提示磁场可在很大程度上放大草履虫的负重力轴。还讨论了感应电场对游泳行为的影响。

Paramecium multimicronucleatum was used as a model cell to study the effects of 60 Hz magnetic fields on swimming behavior. When exposed to a vertical field of 0.6 T, the cells accumulated at the upper end of the cuvette. An analysis of the swimming behavior revealed that the exposure to the field increased the number of cells swimming upwards maximally at 1 min after onset of the exposure. This effect of the magnetic field was transient, disappearing within a few minutes during the exposure. It is suggested that the magnetic field may amplify to a large extent the negative gravitaxis of Paramecium. Effects of an induced electric field on the swimming behavior are also discussed.