Now showing items 4161-4180 of 4968

    • Palma Alvarado, Verónica; Carrasco, Héctor; Reinchisi, Gisela; Olivares, Gonzalo; Faunes, Fernando; Larraín, Juan (SOC BIOLGIA CHILE, 2011)
      Proliferation and cell fate determination in the developing embryo are extrinsically regulated by multiple interactions among diverse secreted factors, such as Sonic Hedgehog (SHh), which act in a concentration-dependent ...
    • Ormazábal Toledo, Rodrigo; Campodónico, Paola R.; Contreras Ramos, Renato (Amer Chemical Soc, 2011-02-18)
      It is proposed that the electrofugality of a fragment within a molecule is determined by its group nucleophilicity. The variation of electrofugality should be tightly related to the electron releasing ability of the ...
    • Paredes, María Alejandra; Montecino, Vivian (Elsevier, 2011-03-01)
      Large microalgae, such as diatoms can generate high levels of biomass, unlike small phytoplankton components in the austral Fjords and estuarine systems of Chile. We propose a cell-size-based diversity index (H'(size)) ...
    • Naya, Daniel; Veloso Iriarte, Claudio; Sabat Kirkwood, Alejandro Pablo; Bozinovic, Francisco (Elsevier, 2011)
      Our planet is undergoing fast environmental changes,which are referred as global change. In this newscenario, it is of paramount relevance to understand the mechanistic basis of animal responses to environmental change. Here ...
    • Muñoz, F.; Rogan Castillo, José; García, G.; Ramírez, M.; Valdivia Hepp, Juan; Ramírez, R.; Kiwi Krauskopf, Marcos (SPRINGER, 2011-01)
      Collision processes between a single gold atom and a gold cluster are investigated by means of ab initio techniques. The targets we consider are minimum energy 13 gold atom clusters. The kinetic energy of the projectile ...
    • Vergara, Rodrigo C.; Torres Araneda, Alejandra; Villagra, Diego A.; Raguso, Robert A.; Arroyo, Mary T. K.; Villagra, Cristian A. (2011)
      The study of multi-modal communication has only recently been extended to innate and learned interactions between flowers and their animal visitors, and usually only to pollinators. Here we studied the relevance of floral ...
    • Zhang, Ziyang; Ito, Wulf D.; Hopfner, Úrsula; Böhmert, Björn; Kremer, Mathias; Reckhenrich, Ann K.; Harder, Yves; Lund, Natalie; Kruse, Charli; Machens, Hans Günther; Egaña, José T. (Elsevier, 2011)
      Increasing evidence suggests that vascular resident endothelial progenitor cells (VR-EPCs) are present in several organs, playing an important role in postnatal neovascularization. Here, we isolated and characterized VR-EPCs ...
    • Martínez, C.; Smith, P. C.; Rodriguez, J. P.; Palma Alvarado, Verónica (SAGE PUBLICATIONS INC, 2011-04)
      Regulation of cell renewal in the periodontium is a critical cell function that has not been clarified. Sonic hedgehog (Shh) is a secreted signaling molecule that plays a key role during development and adult tissue ...
    • Mantoiu, Marius; Purice, Radu; Richard, Serge (WORLD SCIENTIFIC PUBL CO PTE LTD, 2011-02)
      We introduce magnetic coherent states for a particle in a variable magnetic field. They provide a pure state quantization of the phase space R(2N) endowed with a magnetic symplectic form.
    • Lizama, Carlos; Poblete Oviedo, Verónica (BIRKHAUSER VERLAG AG, 2011-03)
      In this paper, we give a necessary and sufficient conditions for the existence and uniqueness of periodic solutions of inhomogeneous abstract fractional differential equations with delay. The conditions are obtained in ...
    • Humam, Munir; Kehrli, Thomas; Jeannerat, Damien; Muñoz Muñoz, Orlando; Hostettmann, Kurt; Christen, Philippe (AMER CHEMICAL SOC, 2011-01)
      Three tropane alkaloids, named schizanthines N, O, and P (1-3), have been isolated from the crude alkaloid extract of the endemic Chilean plant Schizanthus tricolor. On the basis of extensive NMR studies and MS fragmentation ...
    • Kellner, Alexander W. A.; Rubilar Rogers, David; Vargas, Alexander; Suárez, Mario (ACAD BRASILEIRA DE CIENCIAS, 2011-03)
      Partial remains of a titanosaur sauropod collected in the Tolar Formation (Upper Cretaceous) at the Atacama Desert (Antofagasta Region), northern Chile, is described, and a new species, Atacamatitan chilensis gen. et sp. ...
    • Hernández, Pedro P.; Undurraga, Cristian; Gallardo, Viviana E.; Mackenzie, Natalia; Allende Connelly, Miguel; Reyes, Ariel E. (SOC BIOLGIA CHILE, 2011)
      Copper is an essential ion that forms part of the active sites of many proteins. At the same time, an excess of this metal produces free radicals that are toxic for cells and organisms. Fish have been used extensively to ...
    • Gómez Jeria, Juan; Parra Mouchet, Julia; Morales Lagos, Demian (ELSEVIER SCIENCE BV, 1991-03-07)
      In order to examine environmental effects, the interaction oí histamine (HA) with a model of the H2 receptor was analyzed using the self-consistent reaction field theory at the CNDO/21evel, in vacuo, and in the presence ...
    • Gómez Jeria, Juan; Madrid Aliste, Carlos (Human Sciences Press, Ine., 1996)
      We discuss the phylogenetic basis of states of consciousness, and present the central theses of monism and dualism, in which near-death experiences (NDEs) enjoy very different ontological statuses. Next, we summarize the ...
    • Contreras Ramos, Renato; Padilla, Luis; Gómez Jeria, Juan (Elsevier, 1990)
      The relative thermodynamic stabilities of several ion-pair structures, including intimate and solvent-separated forms, in solution have been studied for the allyl +/F- and allyl- /Li + model systems. The electrostatic ...
    • Gómez Jeria, Juan; Sotomayor, P. (ELSEVIER SCIENCE BV, 1988)
      A Quantitative Structure-Activity Relationship study for a group of opiates interacting with the mu receptor was carried out. The study consisted in searching a relationship between the drug-receptor equilibrium constant ...
    • Gómez Jeria, Juan; Parra Mouchet, Julia; Morales Lagos, Demian (ELSEVIER SCIENCE BV, 1991-03-07)
      In order to examine environmental effects, the interaction oí histamine (HA) with a model of the H2 receptor was analyzed using the self-consistent reaction field theory at the CNDO/21evel, in vacuo, and in the presence ...
    • Gómez Jeria, Juan; Morales Lagos, Demian; Cassels Niven, Bruce; Saavedra Aguilar, Juan Carlos (QSARWorld, 1986)
      A QSAR study was carried out seeking a relationship between the receptor binding affinities and the molecularelectronic structures of a group of 7-substituted tryptamines. The results suggest that these molecules interact ...
    • Gómez Jeria, Juan; Ojeda Vergara, Mario (John Wiley & Sons, Inc., 1996-03-22)
      The binding of apomorphines AM. to D1 and D2 dopamine receptors is analyzed through a formal quantum structure]activity relationship method. The calculations were carried out at the CNDOr2 level of the molecular orbital ...