Now showing items 21-40 of 2730

    • Núñez Vergara, Luis; Donoso, G.; Roman, A.; Squella Serrano, Juan (1988)
      The apparent permeation rate constants and amount of ranitidine transferred in 1 h were measured through everted rat intestine using a perfusion apparatus. The effects of pH and 5% or 10% ethanol on the apparent permeation ...
    • Valderrama Tapia, Jaime Adolfo; Tapia, R.; Saitz Barría, Claudio (MARCEL DEKKER INC, 1992)
      The synthesis of pyranoquinone 9 starling from hydroxyquinone 4 through Michael adduct 5 is described.
    • Griesar, Klaus; Athanassopoulou, Maria A.; Soto Bustamante, Eduardo; Tomkowicz, Zbigniew; Zaleski, Andrzej J.; Haase, Wolfgang (WILEY-V C H VERLAG GMBH, 1997-01)
      Ferrimagnetic coupling in a mesogen is reported for the first time for the compound Mn-III[((OC12H25)(4)TPP)](TCNE) . 2 toluene (where TPP = tetraphenyl porphyrin, TCNE = tetracyanoethylene), which displays liquid crystal ...
    • Abuin, E.; Lissi, E.; Aravena, D.; Zanoco, A.; Macuer, M. (1988)
      Fluorescence techniques are used to study the effect of size on the properties of dioctadecyldimethylammonium chloride vesicles. The solubilization site and the deactivation rates of excited pyrene by bromide counterions ...
    • Vieira, Camila M. S.; Mafra, Gabriela; Brognoli, Rafael; Richter Duk, Pablo; Rosero Moreano, Milton; Carasek, Eduardo (Elsevier, 2020)
      In this study, a high throughput approach to rotating-disk sorptive extraction (RDSE) using laminar cork as extraction phase is demonstrated for the first time in the determination of 20 multiclass organic micro-pollutants ...
    • Lemp Miranda, Else; Zanocco Loyola, Antonio; Günther Sapunar, Germán; Morales, Javier O. (2009)
      A high-performance liquid chromatography (HPLC) method for the determination of four different flavonoids, rutin, morin, quercetin, and 3-hydroxyflavone in dipalmitoylphosphatidylcholine (DPPC) liposome solutions has been ...
    • Zanocco, A.; Marquez, A.; Rodriguezc, H. (1997)
      The kinetics of the reaction between N-p-methoxybenzyliden-cc-phenylglycine methyl ester and nitrosobenzene, using benzene as the solvent and both acetic and chloroacetic acid as catalysts, was studied by means of UV-VIS ...
    • Valenzuela, F.; Basualto, C.; Sapag, J.; Romero, J.; Höll, W.; Fonseca, C.; Araneda, C. (Taylor and Francis Inc., 2010)
      A kinetics analysis was conducted for the recovery of zinc (II) ions from a mine drainage sample by a liquid surfactant membrane containing di-(2-ethylhexyl)phosphoric acid as a carrier extractant and Span-80 as the ...
    • Mallco, Abdiel; Portillo, Carlos; Kogan, Marcelo J.; Galleguillos, Felipe; Fernández, Ángel G. (MDPI, 2020)
      Featured Application: monitoring the effect of molten salt corrosion on materials used in solar thermal plants by means of electrochemical tests.
    • Zunino Venegas, Hugo; Aguilera S., S. María; Peirano V., Pedro (The Williams & Wilkins Co., 1975)
      An experimental method to determine available phosphate in soils using anion exchange resin as an extractant has been described (3, 5). However, when this method is applied to volcanic ash-derived soils, some problems ...
    • Pinto, Mauricio; Córdova Delgado, Miguel; Martínez Retamal, Ignacio; Muñoz Medel, Matías; Bravo, M. Loreto; Duran, Doris; Toledo Villanueva, Francisco Javier; Sánchez, César; Acevedo, Francisco; Mondaca, Sebastián; Koch, Erica; Ibáñez, Carolina; Galindo, Héctor; Madrid, Jorge; Nervi, Bruno; Peña, José; Torres, Javiera; Owen, Gareth I.; Corvalán, Alejandro H.; Armisén, Ricardo; Garrido, Marcelo (MDPI, 2020)
      Gastric cancer (GC) is a complex and heterogeneous disease. In recent decades, The Cancer Genome Atlas (TCGA) and the Asian Cancer Research Group (ACRG) defined GC molecular subtypes. Unfortunately, these systems require ...
    • Baggio, Ricardo; Calvo, Rafael; Garland, María Teresa; Peña, Octavio; Perec, Mireille; Slep, Leonardo D. (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 ...
    • Muñoz Muñoz, Orlando; Delporte, Carla; Backhouse, Nadine; Erazo, Silvia; Negrete, Rosa; Maldonado, Sergio; López Pérez, J.; San Feliciano, Arturo (2000)
      A novel cucurbitacin glycoside has been isolated from aerial parts of Kageneckia oblonga R. et P. and shown to be 3 beta-(beta-D-glucosyloxy)-16 alpha,23 alpha-epoxycucurbita-5,24-dien-11-one. The structure was established ...
    • Venegas Yazigi, Diego; Vega, Andrés; Valdes de la Barra, Karen; Saldías, Marianela; Le Fur, Eric (2012)
      The structure of the title compound, poly[(dihydrogenphosphato-?O)(mu 3-hydrogenphosphato)di-mu-oxido-(1,10-phenanthroline)copper(II)vanadium(V)], [CuV(HPO4)(H2PO4)O2(C12H8N2)]n, is defined by [(phen)Cu mu-(?2O:O'-VP2O10 ...
    • Squella Serrano, Juan; Solabarrieta, C.; Núñez Vergara, Luis (1993)
      The cyclic voltammetric behaviour of nifedipine was studied. The addition of three aprotic solvents to nifedipine in an aqueous citrate buffer system was examined. Qualitatively they result in separation of the initial ...
    • Moscoso Cabello, Raúl Andrés; Inostroza, E.; Squella Serrano, Juan (Elsevier, 2017)
      In a conventional voltammetric experiment, the electroactive species is dissolved in solution, and then diffuses from the solution phase to the electrode phase. In our proposed non-conventional voltammetric experiment, ...
    • Cancino, P.; Vega, Andrés; Santiago Portillo, Andrea; Navalon, Sergio; Alvaro, Mercedes; Aguirre Álvarez, Pedro; Spodine Spiridonova, Evgenia; García, Hermenegildo (Royal Society of Chemistry, 2016)
      The synthesis and structure of a novel heteronuclear Cu-II and La-III metal organic framework (MOF) having pyridinedicarboxylic acid (CuLa-MOF) is reported. The obtained MOF with the formula {[Cu0.5La2(HPDC)(PDC)(2)(SO4) ...
    • Alvarez, Marjorie; Chavez, Myra; Calorio Miranda, Miguel; Aedo, Geraldine; Allende Connelly, Miguel; Egaña, José (Nature Publishing Group, 2018-07-19)
      Cigarette smoke is associated with several pathologies including chronic respiratory diseases and cancer. In addition, exposure to cigarette smoke is correlated with impaired wound healing, where a significant decrease in ...
    • Squella Serrano, Juan; Zanocco, A.; Perna, S.; Núñez Vergara, Luis (1990)
      Nitrendipine produces a well-defined polarographic peak due to the four-electron reduction of the nitro group. This peak is used for tracking the photodecomposition of nitrendipine in both UV light and daylight conditions. ...
    • Romero, Nalda; Fernández, Arturo; Robert Canales, Paz (2012)
      Tara is a native species of Peru and is widely distributed in Latin America; its fruits (pods) have a high potential for medical, industrial and food uses. A supercritical tara polyphenol extract (STPE) was obtained from ...