Artículos de revistas: Recent submissions

Now showing items 4921-4940 of 4970

    • From ligand design to therapeutic efficacy: the challenge for nicotinic receptor research 
      Cassels Niven, Bruce; Bermúdez, Isabel; Dajas, Federico; Abin Carriquiry, Juan Andrés; Wonnacott, Susan (ELSEVIER SCI LTD, 2005-12)
      S-Nicotine, the principal psychoactive constituent of Nicotiana tabacum, underpins addiction to tobacco smoking. Although tobacco consumption is a leading cause of death worldwide, nicotine itself is also proposed to have ...
    • SERS spectrum and DFT calculations of 6-nitrochrysene on silver islands 
      Carrasco, E. A.; Campos, M.; Clavijo Campos, Ernesto; Leyton, Patricio; Díaz, G.; Koch, Rainer (ELSEVIER SCIENCE BV, 2005-03-17)
      The interaction of 6-nitrochrysene with silver clusters has been modelled by using density functional theory calculations DFT. The chemical adsorption through the nitro group and the corresponding molecular orientation of ...
    • Origin, diversification, and historical biogeography of the genus Trachurus (Perciformes : Carangidae) 
      Cárdenas, Leyla; Hernández, Cristián; Poulin, Elie; Magoulas, Antonios; Kornfield, Irv; Ojeda, Patricio (ACADEMIC PRESS INC ELSEVIER SCIENCE, 2005-05)
      We addressed phylogenetic relationships in the genus Trachurus using cytochrome b gene and D-loop sequences. The trees showed five groups: (1) the Southwest Pacific species (T. japonicus, T. novaezelandiae, and T. declivis); ...
    • Role of Cys-295 on subunit interactions and allosteric regulation of phosphofructokinase-2 from Escherichia coli 
      Caniuguir, Andrés; Cabrera Paucar, Ricardo; Báez, Mauricio; Vásquez, Claudio; Babul Cattán, Jorge; Guixé Leguía, Victoria Cristina (ELSEVIER SCIENCE BV, 2005-04-25)
      In a previous work, chemical modification of Cys-238 of Escherichia coli Pfk-2 raised concerns on the importance of the dimeric state of Pfk-2 for enzyme activity, whereas modification of Cys-295 impaired the enzymatic ...
    • Prion protein NMR structures of chickens, turtles, and frogs 
      Calzolai, Luigi; Lysek, Dominikus; Pérez, Daniel; Günter, Peter; Wüthrich, Kurt (NATL ACAD SCIENCES, 2005-01-18)
      The NMR structures of the recombinant prion proteins from chicken (Gallus gallus; chPrP), the red-eared slider turtle (Trachemys scripta; tPrP), and the African clawed frog (Xenopus laevis; xlPrP) are presented. The amino ...
    • DNA evidence of Trypanosoma cruzi in the Chilean wild vector Mepraia spinolai (Hemiptera : Reduviidae) 
      Botto Mahan, Carezza; Ortiz Zúñiga, Sylvia; Rozas, Marlene; Cattan Ayala, Pedro; Solari Illescas, Aldo (FUNDACO OSWALDO CRUZ, 2005-05)
      Molecular evidence showed 46.2% of Trypanosoma cruzi infection in Mepraia spinolai insects from North-Central Chile, which is significantly higher than previous reports of up to 26% by microscopic observation. Our results ...
    • Seasonal variation in the home range and host availability of the blood-sucking insect Mepraia Spinolai in ... 
      Botto Mahan, Carezza; Cattan Ayala, Pedro; Canals Lambarri, Mauricio; Acuña Retamar, Mariana (ELSEVIER SCIENCE BV, 2005-08)
      n this study, we quantify the home range of Mepraia spinolai, a wild vector of Trypanosoma cruzi, and the abundance of wild mammals during summer and winter seasons in a protected area of north-central Chile. Results ...
    • Electrodeposition of CdTe thin films onto n-Si(100): nucleation and growth mechanisms 
      Gómez, H.; Henríquez, R.; Schrebler, R.; Córdova, R.; Ramírez, D.; Riveros, Gabriel; Dalchiele, E. A. (PERGAMON-ELSEVIER SCIENCE, 2005-01-30)
      The mechanisms related to the initial stages of the nucleation and growth of cadmium telluride (CdTe) thin films on the rough face side of a (10 0) monocrystalline n-type silicon have been studied as a function of different ...
    • Amyloid formation modulates the biological activity of a bacterial protein 
      Bieler, Sylvain; Estrada, Lisbell D.; Lagos Mónaco, Rosalba; Baeza Cancino, Marcelo; Castilla, Joaquín; Soto, Claudio (AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC, 2005-07-22)
      The aggregation of proteins into amyloid fibrils is the hallmark feature of a group of late-onset degenerative diseases including Alzheimer, Parkinson, and prion diseases. We report here that microcin E492, a peptide ...
    • Relationship between local electrophilicity and rate coefficients for the hydrolysis of carbenium ions 
      Aizman, Arie; Contreras Ramos, Renato; Pérez López, Patricia (PERGAMON-ELSEVIER SCIENCE LTD, 2005-01-24)
      The local electrophilicity of a series of 28 carbenium ions has been ranked within a theoretical absolute scale. New substituent constants are introduced to account for the responses of the electrophilicity pattern induced ...
    • Iron homeostasis in neuronal cells: a role for IREGI 
      Aguirre, Pabla; Mena, Natalia P.; Tapia, Victoria; Arredondo Olguín, Miguel Armando; Núñez González, Marco (BIOMED CENTRAL LTD, 2005-01-24)
      Background: Iron is necessary for neuronal function but in excess generates neurodegeneration. Although most of the components of the iron homeostasis machinery have been described in neurons, little is known about the ...
    • Neurotransmission in the carotid body: transmitters and modulators between glomus cells and petrosal ganglion ... 
      Iturriaga, Rodrigo; Alcayaga Urbina, Julio (ELSEVIER SCIENCE BV, 2004-12)
      The carotid body (CB) is the main arterial chemoreceptor. The most accepted model of arterial chemoreception postulates that carotid body glomus (type 1) cells are the primary receptors, which are synaptically connected ...
    • Effects of natural flavones and flavonols on the kinase activity of Cdk5 
      Zapata Torres, Gerald Amilcar; Opazo, Felipe; Salgado, J. Cristián; Muñoz Concha, Juan; Krautwurst, Hans; Mascayano, Carolina; Sepúlveda Boza, Silvia; Maccioni Baraona, Ricardo; Cassels Niven, Bruce (AMER CHEMICAL SOC, 2004-03)
      A number of natural and synthetic flavonoids have been assessed previously with regard to their effects on the activity of cyclin-dependent kinases (Cdk1 and -2) related to the inhibition of cell cycle progression. On the ...
    • Insect antifeedant compounds from Nothofagus dombeyi and N-pumilio 
      Thoison, Odile; Sévenet, Thierry; Niemeyer Marich, August; Russell, Graeme B. (PERGAMON-ELSEVIER SCIENCE LTD, 2004-07)
      A bioassay-guided purification of the extracts of Nothofagus dombeyi and N. pumilio leaves yielded several triterpenes and flavonoids including 2-O-acetylmaslinic acid, 3-O-acetyl 20,24,25-trihydroxydammarane, and ...
    • Coping with salt without salt glands: osmoregulatory plasticity in three species of coastal songbirds ... 
      Sabat Kirkwood, Alejandro Pablo; Maldonado, Karin; Rivera Hutinel, Antonio; Farfán, Gonzalo (SPRINGER, 2004-07)
      We investigated the phenotypic plasticity of renal function in three South American coastal passerine Cinclodes (ovenbirds) differing in the proportion of marine prey they consume. Individuals were acclimated to two regimes ...
    • Ethanol increases tumor necrosis factor-alpha receptor-1 (TNF-R1) levels in hepatic, intestinal, and cardiac cells 
      Rodríguez, Diego A.; Moncada, Claudio; Núñez González, Marco; Lavandero González, Sergio; Ponnappa, Biddanda C.; Israel Jacard, Yedy (PERGAMON-ELSEVIER SCIENCE LTD, 2004-05)
      Chronic ethanol consumption leads to cell injury in virtually every tissue. Tumor necrosis factor-alpha (TNF-alpha) constitutes a major factor in the development of alcohol-induced liver injury. In alcohol-dependent subjects, ...
    • Role of BMP signaling and the homeoprotein iroquois in the specification of the cranial placodal field 
      Glavic Maurer, Álvaro; Honoré, Stella Maris; Feijóo, Carmen Gloria; Bastidas, Francisco; Allende Connelly, Miguel; Mayor Caro, Roberto (ACADEMIC PRESS INC ELSEVIER SCIENCE, 2004-08-01)
      Different types of placodes originate at the anterior border of the neural plate but it is still an unresolved question whether individual placodes arise as distinct ectodermal specializations in situ or whether all or a ...
    • Temperature spectra from a turbulent thermal plume by ultrasound scattering 
      Elicer Cortés, Juan; Contreras Ramos, Renato; Boyer, Denis; Pavageau, Michel; Hernández, R. H. (ELSEVIER, 2004-10)
      This paper reports the results of a study on temperature inhomogeneities conducted on a thermal plume by using ultrasound scattering as a non-intrusive measurement technique. The plume rises from a metallic disk which can ...
    • Reactivity of the carbon-carbon double bond towards nucleophilic additions. A DFT analysis 
      Domingo, Luis R.; Pérez López, Patricia; Contreras Ramos, Renato (PERGAMON-ELSEVIER SCIENCE LTD, 2004-07-26)
      The global and local electrophilicity indexes have been used to characterize the reactivity pattern of the C=C double bond towards nucleophilic addition reactions. A wide family of molecules including ketones, esters, ...
    • Abscisic acid and jasmonic acid affect proteinase inhibitor activities in barley leaves 
      Casaretto, José A.; Zúñiga, Gustavo E.; Corcuera, Luis J. (URBAN & FISCHER VERLAG, 2004-04)
      Proteinase inhibitor (PI) accumulation has been described as a plant defense response against insects and pathogens. The induction of Pis is known to be regulated by endogenous chemical factors including phytohormones. We ...