A sensitive and selective isotope dilution ion chromatography/tandem mass spectrometry (ID IC-MS/MS) method was developed and validated for the determination of perchlorate in infant formula. The perchlorate was extracted from infant formula by using 20 ml of methanol and 5 ml of 1% acetic acid. All samples were spiked with (18)O(4) isotope-labelled perchlorate internal standard prior to extrac...

Abstract Nowadays climate change due to the unnatural increment of green-house effect is one most critical environmental issues. In this context, internal combustion engines are still a short - term valuable solution. This made possible by study and development synthetic or alternative fuels, such e gasolines hydrogen. direct injection adopted strategy improve engine efficiency. The installatio...

background: leishmaniases are a group of diseases caused by leishmania parasites .  growing of drug unresponsiveness in leishmaniasis patients necessitates the development of new drugs and accor­dingly a suitable assay is needed for evaluation of any modalities.  the aim of this study was to compare four drug assays methods, agar dilution, broth dilution, cylinder plate and disk diffusion, for ...