He observed a similar effect , namely inhibition of feeding followed by death .
Further , Nathanson fed tobacco hornworm larvae with leaves sprayed with such psychoactive drugs as caffeine , formamidine pesticide didemethylchlordimeform ( DDCDM ) , IBMX or theophylline .
Nathanson observed a similar effect , namely inhibition of feeding followed by death .
Further , Nathanson fed tobacco hornworm larvae with leaves sprayed with such psychoactive drugs as caffeine , formamidine pesticide didemethylchlordimeform ( DDCDM ) , IBMX or theophylline .