A simple and rapid solid-phase extraction (SPE)-GC method for the preconcentration and quantification of pyrethroids at low nanogram levels in oils and high fat content samples is presented. The method was studied using seven highly persistent pyrethroid insecticides, viz., cypermethrin, deltamethrin, fenvalerate, cyfluthrin, allethrin, cyhalothrin and permethrin. Preconcentration was achieved ...

In order to improve the chemical control of diamondback moth, Plutella xylostella (L), in Taiwan, the Taiwan Agricultural Research Institute organized in 1980 a program aimed at analyzing the insecticide resistance and mode of action. After almost five years of study, we have gathered information on the sampling method, resistance, cross resistance, the mode of insecticide action, and the effic...

Recently, with increasing public awareness of food safety, developments of some valid and rapidly analytical methods are required for the determination of residual pesticides in crops.This study was conducted on validation of a reliable, accurate and precise method for multi analysis of pesticides residue in melon as a main fruit in Iranian food basket. A reliable, and valid method...

It is also likely that the formation of certain of the metabolites described above would be associated with changes in lipid and/or fatty acid metabolism, either by depleting the tissues of an essential intermediate or by disturbance of the normal allosteric and feedback regulation of lipid synthesis and catabolism. Although very little is known about the possible biochemical mechanisms of thes...

Recent studies showed that limiting food conditions resulted in either increased or decreased sensitivity of Daphnia magna to toxicants. It remained unclear whether these contrasting food-dependent alterations in toxicity resulted from differences in intrinsic sensitivity of the daphnids or from changes in toxicokinetics and resource allocation. It is hypothesized here that, if food level only ...