The structures, synthetic methods, insectical mechanism, degradation, together with environmental safety of benzoyl urea chitin synthesis inhibitors were reviewed in this paper.
对苯甲酰基脲类几丁质合成抑制剂的结构、合成方法、作用机制、代谢及环境安全性等进行了评述。
2
It is introduced that how the optimization of the hydrazine hydrate synthetic technology by urea method and the hydrazine hydrate purification technology by cooling method has been carried out.
介绍对尿素法水合肼合成工艺、冷冻法水合肼提纯工艺进行的优化，和对丙酮汽提法提纯水合肼进行的尝试。
3
The two most important synthetic polyamides are the urea-formaldehyde resins and the various forms of nylon.