A wetted-sphere absorption apparatus was used to measure the liquid-phase diffusion coefficients for hydrogen sulfide, carbon dioxide, and nitrous oxide over the temperature range 293-368 K. The experimental results obtained in this work are compared with values in the literature and with predictions from the Wilke-Chang equation. The data presented here extend the temperature range of reported diffusivities for these gases in water.

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The diffusion coefficients for nitrous oxide in aqueous solutions of diethanolamine (DEA) and iV-methyldiethanolamine (MDEA) were determined using a wetted-sphere absorber over the temperature range 293-368 K. The ranges of amine concentrations covered in the experiments were 10-30 mass % for DEA and 10-50 mass % for MDEA. The diffusion coefficients indicated a linear dependence on amine concentration, but the temperature dependence was nonlinear. It was found that the diffusivity of N2O in aqueous DEA is always less than that in aqueous MDEA under equivalent conditions of amine concentration and temperature.

Objectives: To assess the effect of fasting Ramadan during the hottest month of the year in Riyadh, Saudi Arabia. Materials and Methods: This prospective cohort study was performed at the King Fahd National Guard Hospital in Riyadh, Saudi Arabia. We used the Modification of Diet in Renal Disease formula to estimate the glomerular filtration rate in renal transplant patients who fasted and did not fast before and after Ramadan. Results: There were 43 fasters and 37 nonfasters of comparable ages, with fasters having longer posttransplant times compared with nonfasters (P = .0001). The 2 groups had similar mean estimated glomerular filtration rates before Ramadan: 75.6 ± 29.2 and 65.9 ± 25.9 mL/min (P = .1) and similar mean estimated glomerular filtration rates 6 months after Ramadan: 77.2 ± 29.7 and 64.1 ± 29 mL/min (P = .21). Mean changes in the estimated glomerular filtration rate were similar in the 2 groups: -1.5 ± 10.9 and -2.8 ± 19.3 (P = .7) as was the percentage change (-0.2.2 ± 13.4 and 1.8 ± 15.9; P = .4). In the fasting group, serum creatinine and estimated glomerular filtration rate were similar before and 6 months after Ramadan: 105.1 ± 55 and 105.14 ± 61 µmol/L (P = 1.0) and 75.6 ± 29 and 72.2 ± 29.7 mL/min (P = .36). No significant changes were observed in the nonfasting group. No significant differences were detected regarding fasting in the estimated glomerular filtration rate before and 6 months after Ramadan in the 3 groups with the low, moderate, and high glomerular filtration rates at baseline. Conclusions: Fasting for Ramadan in August does not adversely affect graft function at a mean followup of 7.6 ± 1.3 months.