Diversity of the organophosphate pesticide-degrading bacteria isolated from organophosphate pesticide polluted soil Seasonal dynamics of the resistance to organophosphorus insecticides and its biochemical mechanism in Plutella xylostella (L.) Reactivation of neferine on mice brain cholinesterase inhibited by organophosphate Isolation and Identification of Serratia marcescens Yj1,and Separation and Purification of Organophosphate Degrading Enzymes Effects of two points mutations of esterases from Helicoverpa armigera on metabolic activities of three kinds of insecticides