the pollution of water environments is a challenging issue especially in developing countries. contamination of drinking water with heavy metals has been reported in many parts of the world. arsenic, chromium and lead are dangerous heavy metals and also common contaminants of drinking water. in this study, the capacity and performance of the surfactant-modified sabzevar natural nanozeolite (sms...

a study on the evaluating equivalent damping and response modification factors of frames equipped by pall friction dampers is presented. to do so, buildings with various stories were considered. nonlinear and linear dynamic time history analysis has been performed to evaluate equivalent damping for pall friction dampers. ground motions with various frequency characteristics scaled with iranian ...

the effects of solvent, temperature, time, weight percent of catalyst on the rate and mechanism of cyclization of natural rubber (nr) was studied in toluene and xylene solutions having tin tetra chloride catalyst (sncl4). iodometric titration show, with 8% sncl4 (based on polymer weight) cyclization occurs, leaving 27.4% of the total unsaturation. infrared spectra of cyclized nr show decreased ...

results the behavioral modification of mothers with the barkley method significantly enhanced their resiliency with children of adhd in the experimental group compared to the control group. patients and methods twenty-four mothers of children diagnosed with adhd were randomly enrolled in this study. the mothers were selected from the 22nd of bahman hospital of qazvin city. mothers with a low sc...

in this study, modified starch was used as a fat replacer in the milk. the fat replacer was manufactured from modified starch such as pre-gelatinized and cross–linked starches. modified starches were manufactured by hydrochloric acid and citric acid treatments from potato and wheat and were added to skim milk at concentrations of 0.15%, 0.30% and 0.45%. viscosity, total solid, fat content, titr...

epoxy – polysulfide copolymers without or with low amounts of epoxy in their structure have poor mechanical properties in oxidative curing system.to strengthen the mechanical properties of polysulfide elastomer inclusion of epoxy resin (epon828) as hard segment was studied. ft-ir spectroscopy and rheometry were used to verify the formation of epoxy-polysulfide copolymer.  results obtained from ...

zno and tio2 nanoparticles wereimpregnated with merbromin dye and used as modified photocatalysts for degradation of phenol. dye-modified zno and tio2 showed significantly higher photocatalytic activity than neat zno and tio2 under visible light illumination. moreover, the prepared dye-modified zno showed superior photocatalytic efficiency in degradation of phenol compared to the dye-modified t...

the thioredoxin system, comprising thioredoxin (trx), thioredoxin reductase (trxr) and nadph, is one of the major cellular antioxidant systems, implicated in a large and growing number of biological functions. trx acts as an oxidoreductase via a highly conserved dithiol/disulfide motif located in the active site ( trp-cys-gly-pro- cys-lys-). different factors are involved in the regulation of t...

for a long time, scientists have tried to describe disorders just by genetic or environmental factors. however, the role of epigenetics in human diseases has been considered from a half of century ago. in the last decade, this subject has attracted many interests, especially in complicated disorders such as behavior plasticity, memory, cancer, autoimmune disease, and addiction as well as neurod...

background: pentoxifylline might have a role in the suppression of inflammatory cytokines in non-alcoholic fatty liver disease (nafld).the aim of study  was  to evaluate the effect of pentoxifylline on liver function tests in non-diabetic subjects with nafld. materials and method: this clinical trial was performed in 120 nafld patients. they were divided to two groups by balance block randomiza...