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Refractories with Improved Thermal Shock Performance Serving Low Carbon Economy

China's Refractories 2013年第3期22卷 7-11页

作者： Christos G ANEZIRIS V ROUNGOS Steffen DUDCZIG m emmel Institute of Ceramic.Glass and Construction materials TU Bergakademie Freiberg

Nanoengineered carbon bonded refractories as well as fine grained carbon free refractories with improved thermal shock performance are presented in terms of this contribution.

关键词： nano-scaled additives carbon-free refrac-tories thermal shock resistance filter

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具有优良抗热震性的可服务于低碳经济的耐火材料

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耐火材料 2013年第4期47卷 250-253页

作者： Christos G Aneziris V Roungos Steffen Dudczig m emmel 弗莱贝格工业大学陶瓷玻璃与建筑材料学院德国弗莱贝格09599

为了减少耐火材料对钢水的增碳,将纳米级添加物尖晶石、板状刚玉和碳纳米管加入到Al2O3-C耐火材料中以降低碳含量,研制了用于浇钢水口及钢液过滤器的纳米优化碳结合耐火材料,还将微粉级TiO2和ZrO2添加到无碳Al2O3质陶瓷研制了无碳AZT耐... 详细信息

为了减少耐火材料对钢水的增碳,将纳米级添加物尖晶石、板状刚玉和碳纳米管加入到Al2O3-C耐火材料中以降低碳含量,研制了用于浇钢水口及钢液过滤器的纳米优化碳结合耐火材料,还将微粉级TiO2和ZrO2添加到无碳Al2O3质陶瓷研制了无碳AZT耐火材料。结果表明:纳米级添加物的复合加入可以改善碳结合耐火材料的性能,这是因为材料中原位生成了相互交织的新物相;通过添加ZrO2和TiO2,可以制备出低气孔率、细晶粒且具有优良抗热震性的无碳Al2O3质耐火材料。

关键词：纳米添加物无碳耐火材料抗热震性过滤器

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In VitroSickling Inhibitory Effects and Anti-Sickle Erythrocytes Hemolysis of Dicliptera colorataC. B. Clarke, Euphorbia hirtaL. and Sorghum bicolor(L.) moench

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Open Journal of Blood Diseases 2013年第1期3卷 43-48页

作者： Pius T. mpiana Blaise k. Lombe Aladdin m. Ombeni koto-Te-Nyiwa Ngbolua Damien S. T. Tshibangu Louisette k. Wimba Dorothée D. Tshilanda Felicien k. mushagalusa Sévérin k. muyisa Faculté des Sciences Université de Kinshasa Kinshasa D.R. Congo Institut Supérieur des Techniques médicales de Bukavu Bukavu D.R. Congo Université Officielle de Bukavu Bukavu D.R. Congo

Diclipteracolorata C. B. Clarke, Euphorbia hirta L. and Sorghum bicolor (L.) moench are reported among plant species used in Congolese traditional medicine to treat Sickle Cell Disease. These medicinal plants have been investigated for their inhibitory effect on the induced sickling process of red blood cells using emmel’s test. Aqueous plant extracts showed good antisickling activity as revealed by the observed normal biconcave form of sickle red blood cells in anoxic conditions. The calculated radius of treated red blood cells by Euphorbia hirta L., Diclipteracolorata C. B. Clarke and Sorghum biocolor (L.) moench extracts are 3.31 ± 0.55;3.34 ± 0.53;3.17 ± 0.52, respectively. Euphorbia hirta L. is the most active with a normalization rate, more than 70%. The chemical screening performed on these plants showed the presence of anthocyanins which were then extracted. The test carried out with anthocyanin extracts showed that these phenolic compounds have a good antisickling activity and, additionally, possess an anti-hemolytic effect on SS blood. This suggests that the evidenced biological activity of these plants would be due to anthocyanins. The results hence obtained justify the use of these plants in Congolese traditional medicine.

关键词： Sickle Cell Disease Antisickling Activity Anti-Hemolytic Properties Diclipteracolorata Sorghum bicolor Euphorbia hirta Anthocyanins

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Anti-Sickle Cell Anemia and Bacterial Inhibitory Effects of Uvariodendron molundense(Diels) ***. (Annonaceae) from Ubangi River Basin, DR Congo

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Journal of Biosciences and medicines 2017年第3期5卷 71-84页

作者： koto-Te-Nyiwa Ngbolua Dorotheé D. Tshilanda Djolu R. Djoza Clarisse m. Falanga masengo C. Ashande Damien S. T. Tshibangu Jeff B. Iteku Virima mudogo Pius T. mpiana Dé partement de Biologie Facult&eacute des Sciences Universit&eacute de kinshasa Kinshasa R&eacute publique Dé mocratique du Congo Institut Supé rieur Pé dagogique d’Abumombazi Abumombazi R&eacute publique Dé mocratique du Congo Dé partement des Sciences de l’Environnement Facult&eacute des Sciences Universit&eacute de Gbadolite Gbadolite R&eacute publique Dé mocratique du Congo Dé partement de Chimie Facult&eacute des Sciences Universit&eacute de kinshasa Kinshasa R&eacute publique Dé mocratique du Congo

The present study was carried out with the aim of evaluating the chemical composition and bioactivity of Uvariodendron molundense against Sickle cell disease and associated pathogenic bacteria agents. The antisickling and antibacterial activities were assessed using emmel and micro-dilution methods respectively. The results revealed that the leaves and stem bark of U. molundense contains various secondary metabolites such as total phenols, flavonoids, anthocyanins, tannins, quinones, saponins, alkaloids, steroids, terpenoids and leuco-anthocyanins. The n-hexane (non-polar solvent) extract displayed poor yield (0.66) than the extracts obtained in the polar solvents which have a high yield (methanol: 1.68, Ethanol: 1.46 and Ethyl acetate: 1.40). These results indicate that the abundant secondary metabolites/compounds in this plant species are those which pass easily through the polar solvents (methanol, ethanol and ethyl acetate). This is the case of phytomarkers like flavonoids and tannins (which are most concentrated in methanol) and anthocyanins which are concentrated in ethyl acetate. The extraction yield of organic/triterpenoic acids (betulinic acid rich extract) was 1.70%. All tested extracts displayed antisickling activity. At 100 μg/mL, the rates of normalization were 89% for organic extract (ED50 = 0.391 μg/ml) and 82% for anthocyanins extract (ED50 = 0.659 μg/mL). The antibacterial activity of tested extracts was very good toward Staphyloccocus areus (CmI ≤ 31.25 μg/mL) while, for Escherichia coli, only the organic extract exhibit interesting activity (CmI = 31.25 μg/mL). This study validates for the first time the in vitro antisickling activity of U. molundense. The bioactivity profiles of organic acids extract from the studied plant material indicate that they constitute promising fraction to be further investigated phytochemically for the discovery of new lead compounds for pharmaceutical application.

关键词： Sickle Cell Disease Traditional Foods Nutraceuticals Anthocyanins Triterpenic Acids

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