background/objective: musculoskeletal disorders (msds) are one of the most common causes of occupational injuries. this study was conducted with the objectives of determination of prevalence rate of msds and ergonomics assessment of the risk of msds among workers of a petrochemical company. methods: in this study, 261randomly selected workers in a petrochemical company with at least one year of...

freshly prepared zno nanoparticles were used as an effective heterogeneous base catalyst for the synthesis of aryloximes. the conversion of arylaldehydes and arylketones into the corresponding oximes (up to quantitative yields) was achieved by simply mixing the liquid reactants and hydroxylamine hydrochloride with zno nanoparticles under solvent-free condition. the procedure was carried out und...