Abstract
As the symptoms became more advanced dieldrin poisoning progressively lowered the amount of thoracic glycerol 1-phosphate in resistant and susceptible houseflies whether or not they were examined under anaerobic conditions. This effect was not associated with the normal differences in glycerol 1-phosphate concentration between strains nor with the presence of dieldrin alone. Neither the sarcosomal glycerol 1-phosphate-oxidase system nor the cytoplasmic glycerol 1-phosphate dehydrogenase was inhibited in thoracic preparations made from house-flies poisoned with dieldrin.