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Technological Characterization and Industrial Application of Tunisian Clays from Makthar Area (Central Tunisia) in the Ceramic Industry

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Open Journal of Geology 2016年第7期6卷 626-639页

作者： Imed Ben Salah Moufida Ben M’Barek Jemai Ali Sdiri najet shimi slim Mabrouk Boughdiri Department of Geology University of Sciences of Bizerte Bizerte Tunisia National Engineering School of Sfax Sfax Tunisia Department of Geology University of Sciences of Tunis Tunis Tunisia

This study focused on the geochemical, mineralogical and technological characterization of clays in Makthar area (Central of Tunisia) of Cretaceous-Paleogene. Its aims are to identify and promote use in the field of ceramics industry. The result of the mineralogical analysis of clays showed a dominance of illite with a percentage higher than 65%, of kaolinite and smectite with percentages of 15%. Geochemical analysis of the major elements of clay showed a SiO2 content exceeding 29% and a percentage of Al2O3 higher than 7.5%. The Fe2O3 percentage was ranging from 3% to 8%. The percentage of CaO was between 22.5% and 28% while that of K2O is 4%. The percentages of SO4, MgO and NaO2 were in very small fractions. Granulometric and microgranulometric analysis showed that the clay fraction (2/g to 178 m2/g reflecting illite dominance. Drying behavior indicated that clay mixture had a drying shrinkage less than 7%, while the firing shrinkage didn’t exceed 2% giving the possibility of clay using in the ceramics field.

关键词： Clay Mineral Mineralogy Chemical and Physical Properties Ceramic Industry

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Glucose Metabolism Disorders in Cirrhosis: Frequency and Risk Factors in Tunisian Population. Results of a Cross-Sectional Study

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Open Journal of Gastroenterology 2014年第8期4卷 289-294页

作者： Rym Ennaifer Myriam Cheikh Rania Hefaiedh Hayfa Romdhane Houda Ben Nejma najet Bel Hadj Department of Hepato-Gastro-Enterology Mongi Slim Universitary Hospital Tunis Tunisia

Background and aims: Alterations in carbohydrate metabolism are frequently observed in cirrhosis;to determine the frequency of diabetes mellitus and impaired glucose tolerance in Tunisian cirrhotic patients and identify risk factors. Patients and methods: Cross-sectional study;fasting plasma glucose levels were measured in consecutive patients with cirrhosis. Oral glucose tolerance test was performed if fasting plasma glucose level was normal. Glucose metabolism disorders were then classified as: impaired glucose tolerance and diabetes mellitus. Cirrhotics with glucose metabolism disorder were compared to those without. Results: Seventy-seven patients with cirrhosis were included: 68.8% were diagnosed as having glucose metabolism disorder;diabetes in 42.8% and impaired glucose tolerance in 26%. The tests were able to identify 60.4% of glucose metabolism disorders. Univariate analysis disclosed a higher proportion of female gender (p = 0.04) and more frequent familial history of diabetes mellitus (p = 0.005) in the group with glucose metabolism disorder. There were no statistically differences regarding age, etiology and severity of the cirrhosis, and dry body mass index. Multivariate analysis showed that familial history of diabetes was the only independent risk factor (OR = 5.1, p = 0.005). Conclusion: In our study, the frequency of glucose metabolism disorders was 68.8%. Oral glucose tolerance test allowed disclosing nearly half of them, pointing a high incidence of latent glucose metabolism disorders. In this way, it should be routinely evaluated in all patients with cirrhosis. Familial history of diabetes was the only independent risk factor, suggesting that other factors in addition to liver disease may play a role.

关键词： Cirrhosis Diabetes Impaired Glucose Tolerance

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