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Dissolution kinetics of iron oxides in clay in oxalic acid solutions

International Journal of Minerals,Metallurgy and Materials 2012年第12期19卷 1083-1087页

作者： u.k. sultana A.S.W. kurny Department of Materials and Metallurgical Engineering Bangladesh University of Engineering and Technology

Clay samples containing 8.15% iron oxides and 27.49% alumina were leached in oxalic acid. Leaching experiments were per-formed in aqueous solutions of oxalic acid of 0.2-2 mol/L at 40-80 C for up to 90 min. The mixed kinetic mechanism, i.e., t/τ=[（1 2X/3）（1 X）2/3 ]＋b[ 1 （1 X）1/3], seemed to be the most appropriate one to fit the kinetic data of leaching iron oxides contained in clay in the aqueous oxalic acid solutions. The Arrhenius activation energy for leaching in the 1.8 mol/L oxalic acid was found to be 41.035 kJ/mol.

关键词： clay iron oxides leaching oxalic acid kinetics activation energy

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The association between drinking water salinity and hypertension in coastal Bangladesh

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Global Health Journal 2020年第4期4卷 153-158页

作者： Jahidur Rahman khan Nabil Awan Rownak Jahan Archiee Nasrin sultana Olav Muurlink Health Research Institute Faculty of HealthUniversity of CanberraAustralia Biomedical Research Foundation(BRF) DhakaBangladesh Institute of Statistical Research and Training University of DhakaDhakaBangladesh. Department of Biostatistics University of PittsburghPittsburghU.S.A. karolinska Institutet StockholmSweden Department of Statistics Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipurBangladesh School of Business and Law Central Queensland UniversityBrisbaneAustralia

Aims:This study aims to explore the association between drinking water salinity and hypertension in three coastal sub-districts of ***:The study uses complete data on 6,296 individuals extracted from the latest Bangladesh Poverty and Groundwater Salinity Survey and a mixed-effects logistic regression model as the analytical ***:Mixed-effects logistic regression analysis shows a significant association of medium or higherlevel salinity with hypertension(adjusted odds ratio[AOR]1.650,95%confidence interval[CI]:1.101—2.473).Other variables significantly associated with hypertension are age,sex,education status,water source,and geographical location.A sizable proportion of the total individual-level variance in the probability of being hypertensive was at household-level(20%)and cluster-level(8%).Conclusion:The findings from this study suggest that greater salinity in potable water common in coastal areas in Bangladesh is associated with increased risk of *** study refrains from asserting causality but seeks to stimulate public health and policy interventions to address the increased risk.

关键词： Salinity Hypertension Multilevel model Bangladesh

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Studies on the Hypoglycemic and Hypolipidemic Effects of <i>Nelumbo nucifera</i>Leaf in Long-Evans Rats

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Journal of Diabetes Mellitus 2017年第3期7卷 55-70页

作者： Dipa Islam Amdadul Huque Liton Chandra Mohanta Evena Parvin Lipy Md. Nazibur Rahman Abida sultana Sheuly u. k. Prodhan Department of Food Technology and Nutritional Science Mawlana Bhashani Science and Technology University Bangladesh Biomedical and Toxicological Research Institute Institute of Food Science and Technology Bangladesh Council of Scientific and Industrial Research Dhaka Bangladesh Department of Biochemistry and Molecular Biology Jahangirnagar University Savar Dhaka Bangladesh Department of Food Technology Kishoreganj Polytechnic Institute Kishoregan Bangladesh Science Secondary Education Quality and Access Enhancement Project (SEQAEP) Ministry ofEducation Dhaka Bangladesh

The study was carried out to evaluate the hypolipidemic and hypoglycemic effect of Nelumbo nucifera leaf powder. In rats, hyperlipidemia was induced by feeding High Fat Diet (Lab diet: Dalda: Coconut oil = 4:3:1) and type 2 diabetes was built inside by injecting Alloxan. The sample N. nucifera leaf powder was added in different percentages with the regular Lab Diet for 21 days feeding. In case of hyperlipidemia developed groups, feeding of Nelumbo nucifera leaf powder at, 30% (70% Lab diet + 30% Sample), 20% (80% Lab diet + 20% Sample) and 10% (90% Lab diet + 10% Sample) showed varied but in a nutshell significant (p Nelumbo nucifera leaf powder for 21 days resulted significant decrease in the blood glucose levels of alloxan-induced diabetic rats. Both the percentages of Nelumbo nucifera leaf powder having 20% with 80% Lab Diet and 10% with 90% Lab Diet significantly (p Nelumbo nucifera powder was found to be exerted to the more prominent effects in lowering the blood glucose level. Nelumbo nucifera leaf powder had 75% efficacy rate in lowering the blood glucose level in comparison to the drug control group treated with glibenclamide which was found with the decreasing capability up to 66%. Although not significant, it, based on the data, can be stated that the sample is endowed with the quality of decreasing capability of body weight. Thus, results of the experimental study reveal that the leaf of Nelumbo nucifera has potent hypoglycemic and hypolipidemic properties.

关键词： Diabetics Hypoglycemia Hypolipidemia Alloxan Monohydrate

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