Examination of the midgut luminal proteinase activities in six economically important insects

agrotis ipsilon anthonomus grandis appareil digestif biochemistry biochimie cisteina cysteine diabrotica undecimpunctata diet dieta digestive system enzyme inhibitors helicoverpa zea heliothis virescens inhibidores de enzimas inhibiteur d'enzyme insecte nuisible leptinotarsa decemlineata pest insects ph serina serine sistema digestivo tripsina trypsin trypsine