Browsing by Title Artículos de revistas

Now showing items 1443-1462 of 2801

    • INTRAMOLECULAR [4+2] DIELS-ALDER CYCLOADDITIONS OF 2-SUBSTITUTED PHOSPHABENZENE AND ARSABENZENE IN TRIOSMIUM ... 
      Arce, A. J.; Deeming, A. J.; DeSanctis, Y.; García, A. M.; Manzur Saffie, Jorge; Spodine Spiridonova, Evgenia (Amer. Chem. Soc., 1994-09)
      2-(Trimethylsilyl)-1-phosphabenzene and -1-arsabenzene, Me(3)SiC(5)H(4)E (E = P, AS), react with [Os3H2(CO)(10)] to give the clusters [Os3H2(Me(3)SiC(5)H(4)E)(CO)(9)], which contain sigma-bonded, four-electron-donating mu ...
    • Intramolecular hydrogen bond in biologically active o-carbonyl hydroquinones 
      Martínez Cifuentes, Maximiliano; Weiss López, Boris; Santos, Leonardo S.; Araya Maturana, Ramiro (MDPI, 2014)
      Intramolecular hydrogen bonds (IHBs) play a central role in the molecular structure, chemical reactivity and interactions of biologically active molecules. Here, we study the IHBs of seven related o-carbonyl hydroquinones ...
    • Intranasal administration of gold nanoparticles designed to target the central nervous system: Fabrication ... 
      Gallardo Toledo, Eduardo; Tapia Arellano, Andreas; Celis, Freddy; Sinai, Tomer; Campos, Marcelo; Kogan, Marcelo J.; Sintov, Amnon C. (Elsevier, 2020)
      The presence of the blood-brain barrier (BBB) limit gold nanoparticles (GNP) accumulation in central nervous system (CNS) after intravenous (IV) administration. The intranasal (IN) route has been suggested as a good strategy ...
    • Intraovarian excess of nerve growth factor increases androgen secretion and disrupts estrous cyclicity in the rat 
      Dissen, G. A.; Lara Peñaloza, Hernán; Leyton Canales, Víctor; Paredes Vargas, Alfonso; Hill, D. F.; Costa, M. E.; Martínez Serrano, A.; Ojeda, Sergio R. (ENDOCRINE SOC, 2000-03)
      A single injection of estradiol valerate induces a form of cystic ovary resembling some aspects of the human polycystic ovarian syndrome. Preceding the development of follicular cysts, there is an increase in intraovarian ...
    • Investigación básica en Cardiología: integración con la investigación clínica 
      Lavandero González, Sergio (Sociedad Chilena de Cardiología y Cirugía Cardiovascular, 2000)
      La novedad y creatividad son los dos requisitos esenciales en toda investigación, ya sea ésta de tipo clínica, básica o básico-clínica. En al actualidad ambos aspectos son básicos para la adjudicación de un proyecto de ...
    • Investigation on extraction rate of lanthanides with extractant-impregnated microcapsule 
      Kamio, Eiji; Fujiwara, Yasuhide; Matsumoto, Michiaki; Valenzuela, Fernando; Kondo, Kazuo (ELSEVIER, 2008-05-15)
      Extraction of lanthanum, samarium and erbium into a microcapsule containing 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (EHPNA) is studied. The extraction kinetic model used to predict uptake curves is based on the ...
    • Investigations on new achiral polymeric liquid crystalline mixtures using a pyroelectric modulation technique 
      Navarrete Encina, Patricio; Weyrauch, T.; Soto Bustamante, Eduardo; Werner, R. (GORDON BREACH SCI PUBL LTD, 2000)
      In this paper we report on the synthesis and characterization of new mixtures of achiral liquid crystalline side-chain polymers with their monomers. The samples have a basic structure similar to materials prepared earlier ...
    • Ion pair method to determine the CTAB content in gold nanorods samples 
      Adura, Carolina; Guzman, Fanny; Álvarez Lueje, Alejandro; Kogan Bocian, Marcelo (Sociedad Chilena de Quimica, 2015)
      In this work, we report a fast and accessible method for quantification of cetyltrimethylammonium bromide (CTAB) in solutions of gold nanorods (GNRs) by bromophenol blue (BPB) ion-paring formation and spectrophotometric ...
    • Ionic liquids for improving the extraction of NSAIDs in water samples using dispersive liquid-liquid ... 
      Toledo Neira, Carla; Álvarez Lueje, Alejandro (Elsevier B.V., 2015)
      A rapid, sensitive and efficient analytical method based on the use of ionic liquids for determination of non-steroidal anti-inflammatory drugs (NSAIDs) in water samples was developed. High-performance liquid chromatography ...
    • Ionic liquids intercalated in montmorillonite as the sorptive phase for the extraction of low-polarity ... 
      Fiscal-Ladino, Jhon A.; Obando-Ceballos, Mónica; Rosero-Moreano, Milton; Montaño, Diego F.; Cardona, Wilson; Giraldo, Luis F.; Richter Duk, Pablo (Elsevier B.V., 2017)
      © 2016 Elsevier B.V. Montmorillonite (MMT) clays were modified by the intercalation into their galleries of ionic liquids (IL) based on imidazolium quaternary ammonium salts. This new eco-materials exhibited good features ...
    • Ionic self-complementarity induces amyloid-like fibril formation in an isolated domain of a plant copper ... 
      Mira, Helena.; Vilar, Marçal; Esteve, Vicent; Martinell, Marc; Kogan Bocian, Marcelo; Giralt, Ernest; Salom, David; Mingarro, Ismael; Peñarrubia, Lola; Pérez Payá, Enrique (BioMed Central Ltd., 2004-06-04)
      Arabidopsis thaliana copper metallochaperone CCH is a functional homologue of yeast antioxidant ATXI, involved in cytosolic copper transport. In higher plants, CCH has to be transported to specialised cells through ...
    • Iridoid Glycosides from Escallonia Species 
      Tomassini, L.; Foddai, S.; Nicoletti, M.; Erazo, Silvia; García, R.; Bravo, F.H. (Pergamon Press Ltd, 1993)
      Phytochemical study of Escallonia myrtoidea, E. illinita, E. alpina and E. pulverulenta led to the isolation of asperuloside and other C10-iridoid glycosides. From E. myrtoidea a new iridoid glycoside was isolated and ...
    • Iron induces protection and necrosis in cultured cardiomyocytes: Role of reactive oxygen species and nitric oxide 
      Muñoz, Juan Pablo; Chiong Lay, Mario; García Nannig, Lorena; Troncoso Cotal, Rodrigo; Toro, Barbra; Pedrozo Cibils, Zully; Díaz Elizondo, Jessica; Salas, Daniela; Parra Ortíz, María Valentina; Núñez González, Marco; Hidalgo Tapia, María Cecilia; Lavandero González, Sergio (ELSEVIER SCIENCE INC, 2010-02-15)
      We investigate here the role of reactive oxygen species and nitric oxide in iron-induced cardiomyocyte hypertrophy or cell death Cultured rat cardiomyocytes incubated with 20 mu M iron (added as FeCl3-Na nitrilotriacetate, ...
    • Iron-induced oxidative damage in colon carcinoma (Caco-2) cells 
      Núñez González, Marco; Tapia, Victoria; Toyokuni, Shinya; Okada, Shigeru (Harwood Academic Publishers GmbH, 2001)
      Intestinal epithelial cells have an active apical iron uptake system that is involved in the regulated absorption of iron. By the action of this system, intestinal cells acquire increasing amounts of iron with time. Since ...
    • Iron-iron interaction through an ethanedithiolate ligand: A magnetic and theoretical study 
      Costuas, Karine; Valenzuela, María Luisa; Vega, Andrés; Moreno, Yanko; Pea, Octavio; Spodine Spiridonova, Evgenia; Saillard, Jean; Díaz, Carlos (2002)
      The compound ([CpFe(dppe)]2[μ-SCH2CH2S-S,S′]) (PF6)2 ([1][PF6]2) has been synthesized and its magnetic properties have been investigated by susceptometer quantum interface device (SQUID) measurements in the temperature ...
    • Is mitochondrial dysfunction a common root of noncommunicable chronic diseases? 
      Díaz Vegas, Alexis; Sánchez Aguilera, Pablo; Krycer, James R; Morales, Pablo E.; Monsalves Álvarez, Matías; Cifuentes Koster, Mariana; Rothermel, Beverly A.; Lavandero González, Sergio (Endocrine Society, 2020)
      Mitochondrial damage is implicated as a major contributing factor for a number of noncommunicable chronic diseases such as cardiovascular diseases, cancer, obesity, and insulin resistance/type 2 diabetes. Here, we discuss ...
    • Is the determination of the association constant of cyclodextrin inclusion complexes dependent on the technique 
      Yáñez Soto, Claudia; Günther Sapunar, Germán (Sociedad Chilena de Química, 2014)
      Differences in association constants values of cyclodextrin inclusion complexes can be found in the literature. Most of the times, different experimental conditions have been used leading to different results. This paper ...
    • Isoenzyme multiplicity and characterization of recombinant manganese peroxidases from Ceriporiopsis ... 
      Larrondo, L. F.; Lobos, S.; Stewart, P.; Cullen, D.; Vicuña E., Rafael (AMER SOC MICROBIOLOGY, 2001-05)
      We expressed cDNAs coding for manganese peroxidases (MnPs! from the basidiomycetes Ceriporiopsis subvermispora (MnP1) and Phanerochaete chrysosporium (H4) under control of the alpha -amylase promoter from. Aspergillus ...
    • Isolation and characterization of cobalt (III) tris-D-aminosugars 
      Parada Aliste, José; Larrazábal Rojas, Guillermo; Mendoza, Jorge; Cañón, Walter; Ibarra, Carmen (SOCIEDAD CHILENA DE QUIMICA, 2006-06)
      Mixed complexes of animosugars and 1,10-phenanthroline (phen) with cobalt(III), with the composition Co(III)(phen)(2)sugar, disproportionate in aqueous solution in approximately one month, giving non ionic tris-aminosugar ...
    • Isolation and characterization of cobalt(III)tris-D-glucosamine 
      Parada Aliste, José; Larrazábal Rojas, Guillermo (SOCIEDAD CHILENA DE QUIMICA, 2004-06)
      Mixed bis-phenanthroline Co(III) complexes with amino sugars disproportionate over a period of months, giving non-ionic tris(aminosugar)complexes. The complex with alpha-D-glucosamine has the Lambda-configuration with ...