Now showing items 3441-3460 of 4968

    • Cuartas Hernández, Sandra; Medel Contreras, Rodrigo (Public Library of Science, 2015)
      Understanding the factors determining the spatial and temporal variation of ecological networks is fundamental to the knowledge of their dynamics and functioning. In this study, we evaluate the effect of elevation and time ...
    • Fonturbel, Francisco; Candia, Alina; Malebrán, Javiera; Salazar, Daniela; González Browne, Daniela; Medel Contreras, Rodrigo (Wiley-Blackwell, 2015)
      Anthropogenic habitat disturbance is a strong biodiversity change driver that compromises not only the species persistence but also the ecological interactions in which they are involved. Even though seed dispersal is a ...
    • Abarca Lagunas, María José; Rivas Pardo, Jaime; Ramírez Sarmiento, César; Giuxé Leguia, Victoria (Elsevier, 2015)
      The activity of the ADP-dependent glucokinase from Thermococcus litoralis (TlGK) relies on the highly conserved motifs NXXE (i.e. Asn-Xaa-Xaa-Glu) and HXE (i.e. His-Xaa-Glu). Site-directed mutagenesis of residues Glu279 ...
    • Sotes, Gastón J.; Cavieres, Lohengrin A.; Montesinos, Daniel; Pereira Coutinho, Antonio Xavier; José Pelaez, Walter; Lopes, Susana; Pinho e Melo, Teresa M. V. D. (Elsevier, 2015)
      Plant chemical defenses can be qualitative (toxins) to face generalist herbivores and quantitative (digestibility reducers) to specialists. Trichomes can produce chemicals, but also acts as a quantitative defense and in ...
    • Alarcón Espósito, Jazmín; Tapia, Ricardo A.; Contreras Ramos, Renato; Campodónico, Paola R. (Royal Soc Chemistry, 2015)
      We herein report an experimental and theoretical study on preferential solvation effects for the reactions of 1-fluoro and 1-chloro-2,4-dinitrobenzene towards morpholine in acetonitrile, water and mixtures of them of varying ...
    • Bono Merino, María Rosa; Fernández, Dominique; Flores Santibáñez, Felipe; Rosemblatt Silber, Mario César; Sauma Mahaluf, Daniela (Elsevietr, 2015)
      Extracellular ATP is a danger signal released by dying and damaged cells, and it functions as an immunostimulatory signal that promotes inflammation. However, extracellular adenosine acts as an immunoregulatory signal that ...
    • Muñoz, Francisco; Varas, Alejandro; Rogan Castillo, José; Valdivia Hepp, Juan; Kiwi Tichauer, Miguel (Royal Soc Chemistry, 2015)
      The planar to three dimensional transition of Au13-nAgn clusters is investigated. To do so the low lying energy configurations for all possible concentrations (n values) are evaluated. Many thousands of possible conformations ...
    • Botelho, Joao Francisco; Smith Paredes, Daniel; Vargas, Alexander O. (Springer, 2015)
      Specialized morphologies of bird feet have evolved several times independently as different groups have become zygodactyl, semi-zygodactyl, heterodactyl, pamprodactyl or syndactyl. Birds have also convergently evolved ...
    • Coronel, Aníbal; Huancas, Fernando; Pinto Jiménez, Manuel (University Szeged, 2015)
      This article deals with the asymptotic behavior of nonoscillatory solutions of fourth order linear differential equation where the coefficients are perturbations of constants. We define a change of variable and deduce that ...
    • Herrera Morandé, Alejandra; Castro Fernández, Víctor; Merino, Felipe; Ramírez Sarmiento, César; Fernández, Francisco; Vega, Cristina; Guixé Leguía, Victoria Cristina (Wiley & Sons, 2015)
    • Medina, Exequiel; Valenzuela, Sandro L.; Córdova, Cristóbal; Ramírez Sarmiento, César A.; Babul Cattán, Jorge (Wiley & Sons, 2015)
    • López Vergara, Fernanda; Galdámez Silva, Antonio; Manríquez Castro, Víctor; González Morales, Guillermo (Elsevier, 2015)
      This work reports the synthesis by solidestate reaction of Cu2Fe1-xCoxSnS4 solid solutions. Crystal structures of Cu2Fe0.8Co0.2SnS4 and Cu2Fe0.6Co0.4SnS4 were investigated by single crystal X-ray diffraction. Both phases ...
    • Wilson, Carlos; González Billault, Christian (Frontiers Media, 2015)
      A proper balance between chemical reduction and oxidation (known as redox balance) is essential for normal cellular physiology. Deregulation in the production of oxidative species leads to DNA damage, lipid peroxidation ...
    • Delgado Isasi, Luisa; Marín Briano, Víctor (Elsevier, 2015)
      The analysis of temporal changes in the number of scientific articles vvritten on ecosystem services shows an exponential growth from 1991 to 2013. Hovvever, it also shows a lack of information regarding the location of ...
    • Gutiérrez, María Soledad; Rojas Garrido, María Cecilia; Sepúlveda, Dionisia; Baeza Cancino, Marcelo; Cifuentes Guzmán, Víctor; Alcaíno Gorman, Jennifer (Public Library Science, 2015)
      The eukaryotic microsomal cytochrome P450 systems consist of a cytochrome P450 enzyme (P450) and a cytochrome P450 redox partner, which generally is a cytochrome P450 reductase (CPR) that supplies electrons from NADPH. ...
    • Castelblanco Matiz, Lina; Barbachano Torres, Alejandra; Ponce Noyola, Teresa; Ramos Valdivia, Ana; Cerda García‑Rojas, Carlos; Flores Ortiz, César; Barahona Crisóstomo, Salvador; Baeza Cancino, Marcelo; Alcaíno Gorman, Jennifer; Cifuentes Guzmán, Víctor (Springer, 2015)
      The primary carotenoid synthesized by Xanthophyllomyces dendrorhous is astaxanthin, which is used as a feed additive in aquaculture. Cell growth kinetics and carotenoid production were correlated with the mRNA levels of ...
    • Hojman Guiñerman, Sergio; Asenjo, Felipe A. (American Physical Society, 2015)
      The Einstein equations for an isotropic and homogeneous Friedmann-Robertson-Walker universe in the presence of a quintessence scalar field are shown to be described in a compact way, formally identical to the dynamics of ...
    • Rosas, M. N. C.; Schenck, Thilo L.; Hopfner, Úrsula; Centeno, C.; Machens, Hans Günther; Somlai Schweiger, Ian Andreas; Heikenwaelder, M.; Bono Merino, María Rosa; Schwarz, C.; Nickelsen, Jörg; Allende Connelly, Miguel; Egaña, J. T. (Mary Ann Liebert, 2015)
    • López, Rodrigo A.; Muñoz, Víctor; Vinas, Adolfo F.; Valdivia Hepp, Juan (American Institute of Physics, 2015)
      We use a particle-in-cell simulation to study the propagation of localized structures in a magnetized electron-positron plasma with relativistic finite temperature. We use as initial condition for the simulation an envelope ...
    • Arenas Carmona, Luis (Polish Acad. Sciences Inst. Mathematics-Impan, 2015)
      A commutative order in a quaternion algebra is called selective if it is embeds into some, but not all, the maximal orders in the algebra. It is known that a given quadratic order over a number field can be selective ...