The tail extent, tail inertia, percentage of tail DNA and Olive tail moment are selected as parameters, which could be measured by the fluorescent pictures of single cell gel electrophoresis (SCGE) and IMI 1.0 comet assay analysis software.

• 观察指标为彗星状荧光图像的彗星尾长、尾%25DNA、尾惯量、Olive尾矩。