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1·Research advance on non ester pyrethroids was reviewed. Its structural feature, biological activity, research present situation, stereo isomer and resistance were described.

论述了非酯型拟除虫菊酯的研究进展，介绍了其结构特点、生物活性、研究现状、立体异构及抗性方面的内容。

2·Finally, the reason for stereo-isomer variation of cholestane in different depths and abundances are explained.

最后解释了生物标志化合物胆甾烷的立体同分异构体不同深度丰度变化的原因。