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	barwing barycentre barycentric baryon baryonic baryonic matter baryonium baryon number Baryshnikov, Mikhail baryta baryte barytes baryton barège bas basa basal basal body basal cell basal cell carcinoma basal ganglia basal granule basal metabolic rate basal metabolism basal pinacoid

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