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Activation Conditions (activation + condition)
Selected AbstractsChemInform Abstract: A Mild and Convenient One-Pot Two-Step Synthesis of Hydroxyiminodihydrobenzofurans Mediated by Silica Gel under Microwave Activation Conditions.CHEMINFORM, Issue 39 2010Deepak Kumar Barange Abstract Cyclic 1,3-dicarbonyl compounds (I) react with various nitroolefins to furnish the title products exclusively or predominantly as (E)-isomers. [source] Influence of Activation Temperature on Reaction Kinetics in Recycled Clay Waste,Calcium Hydroxide SystemsJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 12 2008Moisés Frías Obtaining pozzolanic materials from recycling of industrial waste and byproducts is a priority action of environmental policy all over the world. This paper describes the effect of activation conditions on the reaction kinetics in calcined clay waste (CCW)/calcium hydroxide systems. The CCW used in this work shows excellent qualities for use as supplementary cementing material in the manufacture of commercial blended cements. This research work presents an exhaustive study about the kinetics of a pozzolanic reaction in this cementing system. The results obtained by different techniques (DTA/TG, X-ray diffraction, and SEM/EDAX) confirm that the activation conditions (in the range 700°,800°C and 2,5 h of retention) have a direct effect on the formation and evolution of hydrated phases. Low activation temperatures favor the CSH gels' formation, while at higher temperatures aluminates (C4AH13) and aluminum silicate hydrates (C4ASH8, hydrotalcites) are predominant. [source] Presurgical lateralization of seizure focus and language dominant hemisphere with O-15 water PET imagingACTA NEUROLOGICA SCANDINAVICA, Issue 2 2000R. Tatlidil Objectives, The purpose of this study was to assess the value of same day blood flow PET in both the identification of the language dominant hemisphere and in the lateralization of the epileptic focus in patients who were preoperatively evaluated for complex partial seizures. Methods, The charts of 24 patients who had temporal lobectomies for seizures were retrospectively reviewed. All PET scans were acquired by using O-15 water tracer (H215O) in both resting and language activation conditions. PET language laterality results were compared to Intracarotid amytal procedure (IAP) results. For epileptic focus lateralizations, regions of interest (ROI) analysis of temporal lobes was performed on resting scans. Results, IAP testing was discordant with PET language mapping in 1 out of 24 cases. This patient had a decline in cognitive abilities as measured by postoperative neuropsychologic testing. For epileptic focus lateralization, the PET was highly sensitive (87%) and specific (100%). Lateralizations with the PET were in agreement with surgical sites in all cases. Eighteen patients (75%) were seizure free and 4 patients (17%) were significantly improved after surgery. Conclusion, The results suggest that O-15 water PET is sensitive and specific in both the lateralization of epileptic focus and the language dominant hemisphere and can be a cost-effective and noninvasive method in presurgical evaluation of patients with complex partial seizures. [source] An Expedient Synthesis of the Repeating Unit of the Acidic Polysaccharide of the Bacteriolytic Complex of Lysoamidase,CHEMISTRY - A EUROPEAN JOURNAL, Issue 3 2005Remy E. J. N. Litjens Abstract The first synthesis of the trisaccharide repeating unit of the acidic polysaccharide of the bacteriolytic complex of lysoamidase is presented. The construction is based on a linear glycosylation strategy that starts from the reducing end and employs thio- and selenoglycosides in a highly stereoselective manner by a single set of activation conditions. The thus-formed trisaccharide is selectively deprotected and oxidised, after which a final deprotection step furnishes the desired repeating unit. [source] | ||||||||||