单词	piperazine
释义	piperazine /pɪˈpɛrəziːn / /pʌɪˈpɛrəziːn/ noun [mass noun] Chemistry A synthetic crystalline compound with basic properties, sometimes used as an anthelmintic and insecticide. A heterocyclic compound; chemical formula: C4H10N2. The final step involved a nucleophilic substitution of the 2-chloro group by piperazine at high temperatures.... The piperazine end of the molecule extends partially into the GC region of the DNA. The interaction energy between the piperazine and the DNA does not alter significantly during the structural changes, suggesting entropy as the driving force for the transitions. Origin Late 19th century: from piperidine + azine.
随便看	palaeometeorology palaeomorphic palaeonemertean palaeonemertine palaeoneurological palaeoneurologist palaeoneurology palaeoniscid palaeoniscoid palaeontographer palaeontographical palaeontography palaeontologic palaeontological palaeontologically palaeontologist palaeontology palaeopallium palaeopathologic palaeopathological palaeopathologist palaeopathology palaeopedological palaeopedologist palaeopedology

英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。