A strong positive test response was observed producing comet tails of a length and DNA content not observed in either viable or dead control cells.

观测到一个强测试反响，产生一个一定长度的彗星尾。在有生机的或者死亡的控制细胞都没有观测到DNA内容。

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Purpose and Methods: In this study, the micronucleus test and comet assay of Vice faber were used to screen pollution situation of the surface water of Yangzhong city.

目的与方法：本文应用蚕豆根尖微核技术和彗星试验对扬中市不同水体的遗传毒物污染状况进行了初步调查。

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Results:The comet rate and comet length of each tissue DNA in test groups increased significantly(P<0.05)compared with control group. And it showed a good dose-response relationship.

结果：各照射剂量组小鼠组织细胞拖尾率和拖尾细胞尾长比对照组显著增加（P<0.05），并呈现良好的剂量反应关系。

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The severity of the laboratory test was equivalent to an oblique collision with the rocky surface of the Earth - a comet coming in at an angle of less than 25 degrees from the horizon, rather than head on (perpendicular to the Earth's surface).

BBC: Comets could have seeded life on Earth