彗头
huì tóu
- cometary head
彗头
彗头[huì tóu]
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观察指标包括DNA断裂分级（将DNA断裂损伤细胞按其损伤程度分级）及DNA彗星尾长（彗头末端到彗尾的长度）。
The grade of DNA breakage and tail length of Comet assay were used to measure DNA damage .
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在1997年2月8日至5月1日期间，Hale-Bopp彗星彗头内存在大量壳层结构。
23,1996 . During the period from Feb. 8,1997 to May 1,1997 , Hale-Bopp had many layers of shell in cometary head .