Adsorption of hexavalent chromium from aqueous solutions by wheat bran

In this research, adsorption of chromium [VI] ions on wheat bran has been studied through using batch adsorption techniques. The main objectives of this study are to 1] investigate the chromium adsorption from aqueous solution by wheat bran, 2] study the influence of contact time, pH, adsorbent dose and initial chromium concentration on adsorption process performance and 3] determine appropriate adsorption isotherm and kinetics parameters of chromium [VI] adsorption on wheat bran. The results of this study showed that adsorption of chromium by wheat bran reached to equilibrium after 60 min and after that a little change of chromium removal efficiency was observed. Higher chromium adsorption was observed at lower pHs, and maximum chromium removal [87.8%] obtained at pH of 2. The adsorption of chromium by wheat bran decreased at the higher initial chromium concentration and lower adsorbent doses. The obtained results showed that the adsorption of chromium [VI] by wheat bran follows Langmuir isotherm equation with a correlation coefficient equal to 0.997. In addition, the kinetics of the adsorption process follows the pseudo second-order kinetics model with a rate constant value of 0.131 g/mg.min The results indicate that wheat bran can be employed as a low cost alternative to commercial adsorbents in the removal of chromium [VI] from water and wastewater

[Association between Helicobacter Pylori infection and first miscarriage]

Miscarriage is the most common problem in pregnancy. Major mechanisms responsible for abortion are not always clear. Some underlying factors have been proved. Hence, efforts are being done to determine the new factors; like chronic infection. In this study, we investigated relationship between helicobacter pylori [HP] infection and first miscarriage. In this study, 70 women with first miscarriage [case group] and 67 with normal [control group] delivery, aged 20-29 years old were studied. Interviews along with 5cc blood were taken from each case to test the specific IgG titer with ELISA method. A questionnaire was filled for each subject. Mean [ +/- SD] age of cases was 23.0 +/- 2.6 and control group was 23.8 +/- 2.7. This difference was not significant [P=0.076]. 45.7% of cases with the first miscarriage and 25.4% control group suffered from HP. Relationship between HP infection and miscarriage was significant [OR=2.48, 95% CI: 1.13-5.46, P=0.013. According to this study, it seems that there is an association between HP infection and first miscarriage. For determining the effect of HP infection on causing the first miscarriage, more studies are required