Browsing by Title Artículos de revistas

Now showing items 907-926 of 7543

    • B modes and the sound speed of primordial fluctuations 
      Palma Quilodrán, Gonzalo; Soto, Alex (Amer Physical Soc, 2015)
      It was recently shown that a large value of the tensor to scalar ratio r implies a constraint on the minimum value of the sound speed c(s) of primordial curvature perturbations during inflation that is stronger than current ...
    • b-Coloring is NP-hard on Co-bipartite Graphs and Polytime Solvable on Tree-Cographs 
      Bonomo, Flavia; Schaudt, Oliver; Stein, Maya; Valencia Pabón, Mario (Springer, 2015)
      A b-coloring of a graph is a proper coloring such that every color class contains a vertex that is adjacent to all other color classes. The b-chromatic number of a graph , denoted by , is the maximum number such that admits ...
    • Backyard poultry production in Chile: animal health management and contribution to food access in an upper ... 
      Di Pillo, Francisca; Anríquez, Gustavo; Alarcón, Pablo; Jiménez Bluhm, Pedro; Galdames, Pablo; Nieto, Vanesa; Schultz-Cherry, Stacey; Hamilton-West Miranda, Christopher (Elsevier B.V., 2019)
      Backyard production systems (BPS) that involve poultry are a good way to improve food security and poverty alleviation. Few studies have been carried out to quantify the contribution of poultry production to these households ...
    • Bacteria driving droplets 
      Ramos, Gabriel; Cordero Garayar, María Luisa; Soto Bertrán, Rodrigo (Royal Society of Chemistry, 2020)
      We confine a dense suspension of motileEscherichia coliinside a spherical droplet in a water-in-oil emulsion, creating a "bacterially" propelled droplet. We show that droplets move in a persistent random walk, with a ...
    • Bacterial communities associated to Chilean altiplanic native plants from the Andean grasslands soils 
      Fernández Gómez, Beatriz; Maldonado, Jonathan; Mandakovic, Dinka; Gaete, Alexis; Gutiérrez, Rodrigo A.; Maass Sepúlveda, Alejandro; Cambiazo, Veronica; González, Mauricio (Nature Publishing Group, 2019)
      The rhizosphere is considered the primary place for soil microbiome differentiation and plays a key role in plant survival, especially for those subjected to environmental stress. Using high-throughput sequencing of the ...
    • Bacterial communities associated with spherical Nostoc macrocolonies 
      Aguilar, Pablo; Dorador, Cristina; Vila Pinto, Irma; Sommaruga, Ruben (Frontiers Media S.A., 2019)
      Copyright © 2019 Aguilar, Dorador, Vila and Sommaruga.Species of the genus Nostoc (Cyanobacteria) can form large colonies of up to several centimeters in diameter that may represent a unique habitat for bacteria in ...
    • Bacterial community structure in a sympagic habitat expanding with global warming: brackish ice brine at 85–90 °N 
      Fernández-Gómez, Beatriz; Díez, Beatriz; Polz, Martin F.; Arroyo, José Ignacio; Alfaro, Fernando D.; Marchandon, Germán; Sanhueza, Cynthia; Farías, Laura; Trefault, Nicole; Marquet, Pablo A.; Molina-Montenegro, Marco A.; Sylvander, Peter; Snoeijs-Leijonmalm, Pauline (Nature Publishing Group, 2019)
      © 2018, International Society for Microbial Ecology.Larger volumes of sea ice have been thawing in the Central Arctic Ocean (CAO) during the last decades than during the past 800,000 years. Brackish brine (fed by meltwater ...
    • Bacterial diversity in the sediments of a temperate artificial lake, Rapel reservoir 
      Dorador, Cristina; Castillo, Gabriela; Witzel, Karl-Paul; Vila Pinto, Irma (2007)
      Rape] reservoir is an eutrophic system in Chile that has undergone a series of anthropogenic impacts in recent decades. To provide a better understanding of the processes occurring in the reservoir, we examined bacterial ...
    • Bacterial oxidation of ferrous iron by Acidithiobacillus ferrooxidans in the pH range 2.5-7.0 
      Meruane, Gabriel; Vargas Valero, Tomás (ELSEVIER, 2003-10)
      The oxidation of ferrous iron by Acidithiobacillus ferrooxidans in the pH range 2.5-7.0 was characterized. In order to measure the rate of bacterial oxidation of ferrous iron with A. ferrooxidans in this high pH range, a ...
    • Bactericidal efficacy of hydrogen peroxide on Cutibacterium acnes 
      Hernandez, P.; Sager, B.; Fa, A.; Liang, T.; Lozano, C.; Khazzam, M. (British Editorial Society of Bone and Joint Surgery, 2019)
      The purpose of this study was to examine the bactericidal efficacy of hydrogen peroxide (H 2 o 2 ) on Cutibacterium acnes (C. acnes). We hypothesize that H 2 o 2 reduces the bacterial burden of C. acnes. Methods The effect ...
    • Balanced training of a hybrid ensemble method for imbalanced datasets: a case of emergency department ... 
      Artetxe, Arkaitz; Graña, Manuel; Beristain, Andoni; Ríos Pérez, Sebastián (Springer, 2020)
      Dealing with imbalanced datasets is a recurrent issue in health-care data processing. Most literature deals with small academic datasets, so that results often do not extrapolate to the large real-life datasets, or have ...
    • Balancing Agent Retention and Waiting Time in Service Platforms 
      Olivares M., Musalem A., Yung D. (Association for Computing Machinery, 2020)
    • Balancing flexibility and performance in three dimensional meshing tools 
      Contreras, Felipe; Hitschfeld Kahler, Nancy; Bastarrica Piñeyro, María Cecilia; Lillo, Carlos (ELSEVIER, 2010)
      It is generally thought within the meshing tool community that object-orientation and other decoupling techniques penalize performance when they are used for building concrete meshing tools. In this paper we show that ...
    • The Bandurrias gabbro: Late Oligocene alkaline magmatism in the Patagonian Cordillera 
      Morata Céspedes, Diego; Oliva, Claudia; Cruz, Rita de la; Suárez Dittus, Manuel (PERGAMON-ELSEVIER SCIENCE, 2005-01)
      The authors present petrological and geochemical data for the Late Oligocene (ca. 27 Ma) Bandurrias gabbro, a small (approximate to 4.5 x 3 km), isolated intrusion near Coyhaique (45degrees35' Lat. S), southern Chile, in ...
    • Barrier, mechanical and conductive properties of polycaprolactam nanocomposites containing carbon based ... 
      Constant, Benjamin; Garzon, Cristhian; Nisar, Muhammad; Bohrz Nachtigall, Sônia Marlí; Quijada Abarca, Juan; Méndez, Rodrigo (Elsevier, 2017)
      In this study, polycaprolactam (PA6) nanocomposites with thermally reduced graphene oxide (TrGO) and carbon nanotubes (CNTs) were prepared by melt blending with the aim of obtaining films with improvements in permeability ...
    • Barrier, mechanical and conductive properties of polycaprolactam nanocomposites containing carbon-based ... 
      Méndez, Rodrigo; Constant, Benjamín; Garzón, Cristhian; Nisar, Muhammad; Nachtigall, Sônia Marlí Bohrz; Quijada Abarca, Juan (Elsevier, 2017)
      In this study, polycaprolactam (PA6) nanocomposites with thermally reduced graphene oxide (TrGO) and carbon nanotubes (CNTs) were prepared by melt blending with the aim of obtaining films with improvements in permeability ...
    • Baryon acoustic oscillations in the Lyα forest of BOSS quasars 
      Busca, N. G.; Delubac, T.; Rich, J.; Bailey, S.; Font Ribera, A.; Kirkby, D.; Le Goff, J. M.; Pieri, M. M.; Slosar, A.; Aubourg, É.; Bautista, J. E.; Bizyaev, D.; Blomqvist, M.; Bolton, A. S.; Bovy, J.; Brewington, H.; Borde, A.; Brinkmann, J.; Carithers, B.; Croft, R. A. C.; Dawson, K. S.; Ebelke, G.; Eisenstein, D. J.; Hamilton, J. C.; Ho, S.; Hogg, D. W.; Honscheid, K.; Lee, K. G.; Lundgren, B.; Malanushenko, E.; Malanushenko, V.; Margala, D.; Maraston, C.; Mehta, K.; Miralda Escudé, J.; Myers, A. D.; Nichol, R. C.; Noterdaeme, P.; Olmstead, M. D.; Oravetz, D.; Palanque-Delabrouille, Nathalie; Pan, K.; Pâris, I.; Percival, W. J.; Petitjean, P.; Roe, N. A.; Rollinde, E.; Ross, N. P.; Rossi, G.; Schlegel, D. J.; Schneider, D. P.; Shelden, A.; Sheldon, E. S.; Simmons, A.; Snedden, S.; Tinker, J. L.; Viel, M.; Weaver, B. A.; Weinberg, D. H.; White, M.; Yèche, C.; York, D. G. (EDP Sciences, 2013)
      We report a detection of the baryon acoustic oscillation (BAO) feature in the three-dimensional correlation function of the transmitted flux fraction in the Lyα forest of high-redshift quasars. The study uses 48 640 quasars ...
    • Basal accretion along the south central Chilean margin and its relationship to great earthquakes 
      Bangs, Nathan L.; Morgan, J. K.; Trehu, A. M.; Contreras Reyes, E.; Arnulf, A.F.; Han, S.; Olsen, K. M.; Zhang, E. (American Geophysical Union, 2020)
      The south central Chilean margin regularly produces many of the world's largest earthquakes and tsunami, including the 2010 Mw 8.8 Maule and 1960 Mw 9.5 Valdivia events. In 2017, we acquired seismic reflection data along ...
    • Basaltic rocks from the Andean Southern Volcanic Zone: Insights from the comparison of along-strike and ... 
      Hickey Vargas, Rosemary; Holbik, Sven; Tormey, Daniel; Frey, Frederick; Moreno Roa, Hugo (Elsevier, 2016)
      The origin of spatial variations in the geochemical characteristics of volcanic rocks erupted in the Andean Southern Volcanic Zone (SVZ) has been studied by numerous researchers over the past 40 years. Diverse interpretations ...
    • Basic parameters of three star clusters in the Small Magellanic Cloud: Kron 11, Kron 63 and NGC 121 
      Baume, Gustavo; Noel, Noelia E. D.; Costa Hechenleitner, Edgardo; Carraro, Giovanni; Méndez Bussard, René Alejandro; Pedreros, M. H. (BLACKWELL, 2008-11-11)
      We present observations for three star clusters, Kron 11, Kron 63 and NGC 121, in the Small Magellanic Cloud. We have studied their structure and derived their fundamental parameters by means of their luminosity functions, ...