cobalt is widely used in different industrial processes for production of various synthetic materials. for assessment of human exposure to toxic metal of co (ii), environmental and biological monitoring are essential processes, in which, preparation of samples is one of the most time-consuming and error-prone aspects prior to instrumental analysis. the aim of this study was to achieve optimum f...

conclusions cu, zn and cr play a specific role in the pathophysiology of diabetic nephropathy. meanwhile in these patients, low serum levels of cu, zn and cr were not associated with factors such as drinking water. possible causes should be sought in other factors like urine, intervention factors in absorption and utilization and individual conditions. results mean ± sd levels of zn, cu and cr ...

multiple sclerosis (ms) is an inflammatory demyelinating disease which the exact etiology is still are far to be clear. reasons for this autoimmune disease are unknown origin. the aim of present study was to evaluate serum levels of selenium in patient with ms compare to healthy subjects. a total of 46 subjects were enrolled in the study, sera of 23 ms cases and 23 healthy normal cohorts as con...

objective: the aim of this study was to find out the prevalence of hypozincemia in patients suffering from tinnitus and to investigate the effect of zinc therapy upon the severity of tinnitus. material and methods: we studied 66 who suffered from tinnitus, which were randomized to two groups according to the zinc level including < 50μg/dl and > 50μg /dl groups. the zinc level was measured in no...

in the present study, the concentrations of three heavy metals including lead (pb), zinc (zn) and arsenic (as) in 72 different honey samples collected from north-western regions of iran were investigated using atomic absorption spectroscopy method. all metals were detected in 88.88% of the honey samples. the range of metals contamination in honey samples was 0.01 to 11.09 ppm. zn was the most a...

copper (cu) is an essential element required by all living organisms, since at least 30 enzymes are known to use cu as a cofactor. cu is also toxic in excess and liver and gills are known to be target organs for it. in the present study, 240 siberian sturgeon juvenile (with initial weight 29.2 ± 3.1 g and initial length 21.8 ± 1.4 cm) were randomly distributed in 12 fiberglass tanks at 4 differ...

We present a joint experimental and theoretical investigation to resolve the discrepancy in the ratio of relative peak cross sections for narrow atomic resonances among various experimental spectra and also between theory and experiment. Our study includes an effort to measure both the absorption and ionization spectra in a single experimental set-up. We also present a careful analysis of the e...

We show that in experimental atomic force microscopy studies of the lifetime distribution of mechanically stressed folded proteins the effects of externally applied fluctuations cannot be distinguished from those of internally present fluctuations. In certain circumstances this leads to artificially nonexponential lifetime distributions, which can be misinterpreted as a signature of protein com...

We present a joint experimental and theoretical investigation to resolve the discrepancy in the ratio of relative peak cross sections for narrow atomic resonances among various experimental spectra and also between theory and experiment. Our study includes an effort to measure both the absorption and ionization spectra in a single experimental set-up. We also present a careful analysis of the e...

in this study, 60 composite samples of dill and onion from two different cultivated areas in khozestan province, iran, were collected and analyzed for the presence and determination of lead and cadmium by flame atomic absorption spectrometry. samples were burned according to aoac at 450 °c, and the residue was dissolved in nitric acid. lead and cadmium contents were determined using calibration...