Srinivas, RJayalakshmi, S KSreeramulu, K2009-05-282009-05-282004-02-31Srinivas R, Jayalakshmi SK, Sreeramulu K. Hydrolysis of organophosphorus compounds by an esterase isozyme from insecticide resistant pest Helicoverpa armigera. Indian Journal of Experimental Biology. 2004 Feb; 42(2): 214-6http://imsear.searo.who.int/handle/123456789/56585Esterase activity of resistant and susceptible H. armigera were compared in gels with different substrate such as naphthyl acetate, naphthyl phosphate, paraoxon and monocrotophos. Whole body extract of resistant H. armigera hydrolyzed paraoxon, monocrotophos and naphthyl phosphate in gels. Resistant H. armigera showed high esterase, phosphatase and paraoxon hydrolase activity compared to susceptible ones.engAnimalsEsterases --metabolismHydrolysisInsecticide ResistanceInsecticides --metabolismLarva --drug effectsLepidoptera --metabolismMonocrotophos --metabolismNaphthalenes --metabolismNaphthols --metabolismOrganophosphorus Compounds --metabolismParaoxon --metabolismPhosphoric Monoester Hydrolases --metabolismJournal Article