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RISS 인기검색어
- 검색키워드
- 저자 : Haouas, Mohamed (검색결과 2 건)
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Castro, Maria,Losch, Pit,Park, Woojin,Haouas, Mohamed,Taulelle, Francis,Loerbroks, Claudia,Brabants, Gert,Breynaert, Eric,Kirschhock, Christine E. A.,Ryoo, Ryong,Schmidt, Wolfgang American Chemical Society 2018 Chemistry of materials Vol.30 No.8
<P>A case study on the understanding of the formation of hierarchical Beta zeolites using gemini-type piperidine based multiammonium surfactant (N<SUB>6</SUB>-diphe) is reported. Complementary techniques were used to investigate N<SUB>6</SUB>-diphe’s structure-directing effect at the molecular level. Combining characterization of the resulting zeolite materials with the toolboxes herein developed for studying clear solutions and dense gels discloses self-assembly processes that govern the growth (and growth inhibition) of nano-Beta zeolite crystals. In clear solution, small-angle X-ray scattering and liquid-state NMR provide insights about the formation of nanoparticles and their degree of order. <SUP>14</SUP>N and <SUP>1</SUP>H-DOSY NMR probe the dynamics and mobility of soluble species. In a dense gel, on the other side, <SUP>27</SUP>Al- and <SUP>29</SUP>Si-(MAS) NMR elucidate the varying local connectivity between initial nano-objects and the final solid products. It has been found that cylindrical micelles control the transformation of solubilized silica and alumina during the formation of zeolite nuclei and guide their crystal growth to nano-Beta rods with bimodal mesoporosity. The predominant smaller mesopores (6 to 8 nm) originate from the template’s hydrophobic alkyl chains, while larger mesopores (10 to 30 nm) are supposed to result from a spinodal decomposition-type segregation of phases consisting of as-formed hydrophobic zeolite rods and an aqueous solution.</P> [FIG OMISSION]</BR>
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Fenugreek seeds reduce aluminum toxicity associated with renal failure in rats
Yosra Belaid-Nouira,Hayfa Bakhta,Zohra Haouas,Imen Flehi-Slim,Hassen Ben Cheikh 한국영양학회 2013 Nutrition Research and Practice Vol.7 No.6
Despite the reports on safety concerns regarding the relationship between aluminum salts and neurological and bone disease, many countries continue to use aluminum as phosphate binders among patients with renal failure. In search for a diet supplement that could reduce aluminum toxicity related to renal failure, we carried out this prospective animal study in which the fenugreek seeds were assessed for their effects on rats nephrotoxicity induced by aluminum chloride (AlCl3). Oral AlCl3 administration during 5 months (500 mg/kg bw i.g for one month then 1600 ppm via drinking water) led to plasma biochemical changes, an inhibition of alkaline phosphatase (ALP), a decrease of total antioxidant status (TAS), and an induction of lipid peroxidation (LPO) in the blood and brain, in addition to kidney atrophy and morphological alterations at the level of Bowman’s capsule, the glomerulus and different sorts of tubules, reminiscent of some known kidney disease. The treatment with the whole fenugreek seed powder (FSP) (5% in the diet) during the last 2 months showed its effectiveness in restoring normal plasma values of urea, creatinine, ALP and glucose, as well as re-increasing the TAS, inhibiting LPO and alleviating histopathological changes in the injured kidneys. This study highlights the induced nephrotoxicicity, as well as the related toxicity in the brain and bone, by chronic oral ingestion of the aluminum salts. However, the maintenance of a diet supplemented with fenugreek seeds could offer protection for the kidney, bone and brain, at the same time.
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