Browsing by Issue Date Artículos de revistas
Now showing items 1321-1340 of 2801
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(PERGAMON-ELSEVIER SCIENCE LTD, 2006-11-13)The reaction of singlet molecular oxygen with a series of cyclic and acyclic alpha-diimines was studied. Time-resolved methods were used to measure total reaction rate constants and steady-state methods were used to determine ...
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(BLACKWELL PUBLISHING, 2006-12)The title compound, [Y-2(C4H5O2)(6)(H2O)(4)](2)(.)4.6H(2)O, has two independent dimeric units, displaying different bridging patterns between metal ions which lead to dissimilar (YY)-Y-... distances. The compound is ...
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(PERGAMON-ELSEVIER SCIENCE LTD, 2006-12)Several factors depending on the sludge, the soil, or the combination of both substrates, may affect element availability to plants. In this study, an assessment was done of the effect of two sludges obtained by different ...
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(SOC BRASILEIRA QUIMICA, 2006-12)It is studied the extraction of cadmium( II) ions from acidic aqueous solutions using a stirred transfer cell-type emulsion liquid membrane ( ELM) prepared by dissolving in kerosene, with D2EHPA ( an alkylphosphoric acid) ...
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(JOHN WILEY & SONS LTD, 2006-12)The anabaseine derivatives 6-methoxy-7-hydroxy-1-(pyridin-3-yl)-3,4-dihydroisoquinoline, 6,7-dimethoxyl-(pyridin-3-yl)-1,2,3,4-tetrahydroisoquinoline and 6,7-dimethoxy-1-(piperidin-3-yl)-1,2,3,4-tetrahydroisoquino- line ...
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(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2006-12-01)Cells have developed compensatory mechanisms to restore cell volume, and the ability to resist osmotic swelling or shrinkage parallels their resistance to necrosis or apoptosis. There are several mechanisms by which cells ...
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(ELSEVIER, 2006-12-01)H2O2 inactivation of particular GST isoforms has been reported, with no information regarding the overall effect of other ROS on cytosolic GST activity. The present work describes the inactivation of total cytosolic GST ...
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(2007)The oxydiacetate-bridged copper(II) complex [Cu(oda)(1,10-phen)] · 3H2O (oda = oxydiacetate dianion, 1,10-phen = 1,10-phenanthroline) has been characterized. The complex is dinuclear and centrosymmetric with each copper ...
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(2007)Hydrogen bonding and crystal packing play major roles in determining the conformations of ethyl methyl 2-(triphenyl-phospho-ranyl-idene)malonate, Ph3P=C(CO2CH3)CO2CH2CH3 or C24H23O4P, (I), and dimethyl 2-(triphenyl-phosphor- ...
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(2007)The aim of this work was to develop prolonged diltiazem hydrochloride release matrices based on alginate-gelatin mixtures and establish the drug release mechanism. The erosion, swelling, and dissolution behavior of the ...
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(2007)The synthesis and phase characterization of two liquid crystalline methacrylic monomers based on the ω-hexyloxysalicylaldimine group with octyl and decyloxy chain substitutions is presented. The liquid crystalline materials ...
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(SOC BRASILEIRA QUIMICA, 2007)A rapid and simple method was developed for screening polychlorinated biphenyls in transformer oil. The method is based on liquid-liquid extraction in methanol and subsequent direct gas chromatography-mass spectrometric ...
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(ELSEVIER SCI LTD, 2007)The antioxidant effects of tocols (α-tocopherol and α-tocotrienol) and Rosa mosqueta shell extract added to antioxidant-stripped canola oil (TCO) were evaluated and compared with the non-stripped oil (CO) under the same ...
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(2007)The antioxidant effects of tocols (α-tocopherol and α-tocotrienol) and Rosa mosqueta shell extract added to antioxidant-stripped canola oil (TCO) were evaluated and compared with the non-stripped oil (CO) under the same ...
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(2007)Two new phenolic esters 9-trans-p-coumaroyloxy-α-terpineol (1) and 7-trans-p-coumaroyloxy-taedol (2), both endowed with free radical scavenger activity and cleroda-3,13 (E)-dien-15,18-diol (3) for which a cis stereochemistry ...
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(2007)We report a study of the nonmetal-metal transition of free-standing Pd N clusters (2≤N≤21) carried out through two different theoretical approaches that are extensively employed in electronic structure calculations: a ...
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(2007)One of the most negative environmental impacts that have had an explosive growth of Santiago's Metropolitan Region in the last decades, has been the pollution of water courses caused by effluents of waste waters. As a ...
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(2007)The methoxycarbonylation of alkenes catalyzed by palladium(ii) complexes with P,N-donor ligands, 2-(diphenylphosphinoamino)pyridine (Ph 2PNHpy), 2-[(diphenylphosphino)methyl]pyridine (Ph 2PCH2py), and 2-(diphenylphosphin ...
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(2007)This is a report on the separation and recovery of zinc ions from an acidic mine drainage using a stirred transfer cell-type emulsion liquid membrane contactor. Di(2-ethylhexyl) phosphoric acid was used as a highly selective ...
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(Instituto de la Grasa, 2007)The announcement made by Swedish researches in April 2002 concerning the detection of acrylamide in many different foods, has generated a great deal of scientific publications coming from different parts of the world. The ...