Browsing by Author "Valenzuela, M."

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    Development of a temperate rainforest zonation on the Pacific slopes of the North Patagonian Andes since-18 ka
    (2024) Moreno, P. I.; Alloway, B. V.; Valenzuela, M.; Villacis, L. A.; Villa-Martinez, R. P.
    Few studies along the western slopes of the Andes in Northwestern Patagonia (NWP: 40 degrees-44 degrees S) allow examining vegetation development through environmental gradients in latitude and elevation along a time continuum since the Last Glacial Termination (T1, -18-11 ka). This complete biostratigraphic context is necessary for assessing the sequence, timing, rates, and direction of compositional/structural changes of the former vegetation, and for deciphering their environmental drivers. Here we report palynological results from two NWP sites spaced -22 km apart on the western Andean slopes, Caleta Puelche roadside section located near sea level and Lago Reflejos at mid elevations (-800 m a.s.l.) and assess their continuous records since local ice-free conditions against other NWP sites. We find that cold-tolerant early successional trees dominated the initial stages of vegetation development in the Seno Reloncav & iacute; lowlands (-18-17 ka), followed by thermophilous shade-tolerant North Patagonian rainforest (NPRF) trees, which achieved their maxima between -17 and 15 ka at low-elevations. A spread of cold- and shade-tolerant hygrophilous NPRF conifers ensued (-14.8-13 ka) reaching similar magnitude at lowand mid-elevations, interrupted by increases in trees favored by canopy fragmentation linked to fire and explosive volcanism (-13-11 ka). Thermophilous, shade-intolerant, summer-drought tolerant Valdivian rainforest (VRF) trees increased and achieved maxima between -10 and 8 ka, most notably in the lowlands, coeval with peak abundance of the NPRF conifers Fitzroya/Pilgerodendron and Podocarpus nubigena in mid-elevation Lago Reflejos, contemporaneous with their virtual disappearance near sea level. Widespread increases in coldtolerant hygrophilous NPRF trees occurred after -8 ka, followed by mixing of NPRF and VRF elements in the lowlands after -6.3 ka with centennial-scale alternations. Inter-site and regional coherences of our findings suggest that variations in Southern Westerly Wind influence, along with disturbance regimes of natural and human origin, have driven the composition, structure, dynamics, and zonation of temperate rainforests in NWP since T1. We observe that Lago Reflejos features the highest abundance of Fitzroya cupressoides at regional scale since -12 ka, attesting to the importance of mid-elevation Andean environments for the persistence of these highly valued trees in the context of postglacial climate evolution, shifts in fire regimes, volcanic, and human disturbance in NWP.
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    FRIPON: a worldwide network to track incoming meteoroids
    (2020) Colas, F.; Zanda, B.; Bouley, S.; Jeanne, S.; Malgoyre, A.; Birlan, M.; Blanpain, C.; Gattacceca, J.; Jorda, L.; Lecubin, J.; Marmo, C.; Rault, J. L.; Vaubaillon, J.; Vernazza, P.; Yohia, C.; Gardiol, D.; Nedelcu, A.; Poppe, B.; Rowe, J.; Forcier, M.; Koschny, D.; Trigo-Rodriguez, J. M.; Lamy, H.; Behrend, R.; Ferriere, L.; Barghini, D.; Buzzoni, A.; Carbognani, A.; Di Carlo, M.; Di Martino, M.; Knapic, C.; Londero, E.; Pratesi, G.; Rasetti, S.; Riva, W.; Stirpe, G. M.; Valsecchi, G. B.; Volpicelli, C. A.; Zorba, S.; Coward, D.; Drolshagen, E.; Drolshagen, G.; Hernandez, O.; Jehin, E.; Jobin, M.; King, A.; Nitschelm, C.; Ott, T.; Sanchez-Lavega, A.; Toni, A.; Abraham, P.; Affaticati, F.; Albani, M.; Andreis, A.; Andrieu, T.; Anghel, S.; Antaluca, E.; Antier, K.; Appere, T.; Armand, A.; Ascione, G.; Audureau, Y.; Auxepaules, G.; Avoscan, T.; Baba Aissa, D.; Bacci, P.; Badescu, O.; Baldini, R.; Baldo, R.; Balestrero, A.; Baratoux, D.; Barbotin, E.; Bardy, M.; Basso, S.; Bautista, O.; Bayle, L. D.; Beck, P.; Bellitto, R.; Belluso, R.; Benna, C.; Benammi, M.; Beneteau, E.; Benkhaldoun, Z.; Bergamini, P.; Bernardi, F.; Bertaina, M. E.; Bessin, P.; Betti, L.; Bettonvil, F.; Bihel, D.; Birnbaum, C.; Blagoi, O.; Blouri, E.; Boaca, I.; Boata, R.; Bobiet, B.; Bonino, R.; Boros, K.; Bouchet, E.; Borgeot, V.; Bouchez, E.; Boust, D.; Boudon, V.; Bouman, T.; Bourget, P.; Brandenburg, S.; Bramond, Ph.; Braun, E.; Bussi, A.; Cacault, P.; Caillier, B.; Calegaro, A.; Camargo, J.; Caminade, S.; Campana, A. P. C.; Campbell-Burns, P.; Canal-Domingo, R.; Carell, O.; Carreau, S.; Cascone, E.; Cattaneo, C.; Cauhape, P.; Cavier, P.; Celestin, S.; Cellino, A.; Champenois, M.; Chennaoui Aoudjehane, H.; Chevrier, S.; Cholvy, P.; Chomier, L.; Christou, A.; Cricchio, D.; Coadou, P.; Cocaign, J. Y.; Cochard, F.; Cointin, S.; Colombi, E.; Colque Saavedra, J. P.; Corp, L.; Costa, M.; Costard, F.; Cottier, M.; Cournoyer, P.; Coustal, E.; Cremonese, G.; Cristea, O.; Cuzon, J. C.; D'Agostino, G.; Daiffallah, K.; Danescu, C.; Dardon, A.; Dasse, T.; Davadan, C.; Debs, V.; Defaix, J. P.; Deleflie, F.; D'Elia, M.; De Luca, P.; De Maria, P.; Deverchere, P.; Devillepoix, H.; Dias, A.; Di Dato, A.; Di Luca, R.; Dominici, F. M.; Drouard, A.; Dumont, J. L.; Dupouy, P.; Duvignac, L.; Egal, A.; Erasmus, N.; Esseiva, N.; Ebel, A.; Eisengarten, B.; Federici, F.; Feral, S.; Ferrant, G.; Ferreol, E.; Finitzer, P.; Foucault, A.; Francois, P.; Frincu, M.; Froger, J. L.; Gaborit, F.; Gagliarducci, V.; Galard, J.; Gardavot, A.; Garmier, M.; Garnung, M.; Gautier, B.; Gendre, B.; Gerard, D.; Gerardi, A.; Godet, J. P.; Grandchamps, A.; Grouiez, B.; Groult, S.; Guidetti, D.; Giuli, G.; Hello, Y.; Henry, X.; Herbreteau, G.; Herpin, M.; Hewins, P.; Hillairet, J. J.; Horak, J.; Hueso, R.; Huet, E.; Huet, S.; Hyaume, F.; Interrante, G.; Isselin, Y.; Jeangeorges, Y.; Janeux, P.; Jeanneret, P.; Jobse, K.; Jouin, S.; Jouvard, J. M.; Joy, K.; Julien, J. F.; Kacerek, R.; Kaire, M.; Kempf, M.; Koschny, D.; Krier, C.; Kwon, M. K.; Lacassagne, L.; Lachat, D.; Lagain, A.; Laisne, E.; Lanchares, V.; Laskar, J.; Lazzarin, M.; Leblanc, M.; Lebreton, J. P.; Lecomte, J.; Le Du, P.; Lelong, F.; Lera, S.; Leoni, J. F.; Le-Pichon, A.; Le-Poupon, P.; Leroy, A.; Leto, G.; Levansuu, A.; Lewin, E.; Lienard, A.; Licchelli, D.; Locatelli, H.; Loehle, S.; Loizeau, D.; Luciani, L.; Maignan, M.; Manca, F.; Mancuso, S.; Mandon, E.; Mangold, N.; Mannucci, F.; Maquet, L.; Marant, D.; Marchal, Y.; Marin, J. L.; Martin-Brisset, J. C.; Martin, D.; Mathieu, D.; Maury, A.; Mespoulet, N.; Meyer, F.; Meyer, J. Y.; Meza, E.; Moggi Cecchi, V.; Moiroud, J. J.; Millan, M.; Montesarchio, M.; Misiano, A.; Molinari, E.; Molau, S.; Monari, J.; Monflier, B.; Monkos, A.; Montemaggi, M.; Monti, G.; Moreau, R.; Morin, J.; Mourgues, R.; Mousis, O.; Nablanc, C.; Nastasi, A.; Niacsu, L.; Notez, P.; Ory, M.; Pace, E.; Paganelli, M. A.; Pagola, A.; Pajuelo, M.; Palacian, J. F.; Pallier, G.; Paraschiv, P.; Pardini, R.; Pavone, M.; Pavy, G.; Payen, G.; Pegoraro, A.; Pena-Asensio, E.; Perez, L.; Perez-Hoyos, S.; Perlerin, V.; Peyrot, A.; Peth, F.; Pic, V.; Pietronave, S.; Pilger, C.; Piquel, M.; Pisanu, T.; Poppe, M.; Portois, L.; Prezeau, J. F.; Pugno, N.; Quantin, C.; Quitte, G.; Rambaux, N.; Ravier, E.; Repetti, U.; Ribas, S.; Richard, C.; Richard, D.; Rigoni, M.; Rivet, J. P.; Rizzi, N.; Rochain, S.; Rojas, J. F.; Romeo, M.; Rotaru, M.; Rotger, M.; Rougier, P.; Rousselot, P.; Rousset, J.; Rousseu, D.; Rubiera, O.; Rudawska, R.; Rudelle, J.; Ruguet, J. P.; Russo, P.; Sales, S.; Sauzereau, O.; Salvati, F.; Schieffer, M.; Schreiner, D.; Scribano, Y.; Selvestrel, D.; Serra, R.; Shengold, L.; Shuttleworth, A.; Smareglia, R.; Sohy, S.; Soldi, M.; Stanga, R.; Steinhausser, A.; Strafella, F.; Sylla Mbaye, S.; Smedley, A. R. D.; Tagger, M.; Tanga, P.; Taricco, C.; Teng, J. P.; Tercu, J. O.; Thizy, O.; Thomas, J. P.; Tombelli, M.; Trangosi, R.; Tregon, B.; Trivero, P.; Tukkers, A.; Turcu, V.; Umbriaco, G.; Unda-Sanzana, E.; Vairetti, R.; Valenzuela, M.; Valente, G.; Varennes, G.; Vauclair, S.; Vergne, J.; Verlinden, M.; Vidal-Alaiz, M.; Vieira-Martins, R.; Viel, A.; Vintdevara, D. C.; Vinogradoff, V.; Volpini, P.; Wendling, M.; Wilhelm, P.; Wohlgemuth, K.; Yanguas, P.; Zagarella, R.; Zollo, A.
    Context. Until recently, camera networks designed for monitoring fireballs worldwide were not fully automated, implying that in case of a meteorite fall, the recovery campaign was rarely immediate. This was an important limiting factor as the most fragile - hence precious - meteorites must be recovered rapidly to avoid their alteration.
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    Global Variation of Nutritional Status in Children Undergoing Chronic Peritoneal Dialysis : A Longitudinal Study of the International Pediatric Peritoneal Dialysis Network
    (2019) Schaefer, F.; Benner, L.; Borzych-Duzalka, D.; Zaritsky, J.; Xu, H.; Rees, L.; Antonio, Z.L.; Serdaroglu, E.; Hooman, N.; González Celedón, Claudia María; Patel, H.; Sever, L.; Vondrak, K.; Flynn, J.; Rebori, A.; Wong, W.; Holtta, T.; Yildirim, Z.Y.; Ranchin, B.; Grenda, R.; Testa, S.; Drozdz, D.; Szabo, A.J.; Eid, L.; Basu, B.; Vitkevic, R.; Wong, C.; Pottoore, S.J.; Muller, D.; Dusunsel, R.; Celedon, C.G.; Fila, M.; Sartz, L.; Sander, A.; Warady, B.A.; Adragna, M.; Coccia, P.A.; Suarez, A.; Valles, P.G.; Salim, R.; Alconcher, L.; Arbeiter, K.; van Hoeck, K.; Koch, V.; Feber, J.; Harvey, E.; White, C.; Valenzuela, M.; Villagra, J.; Cano, F.; Contreras, M.A.; Vogel, A.; Zambrano, P.; Hevia, P.; Chiu, M.C.; Ding, J.; Vanegas, J.J.; Higuita, L.M.; Roussey, G.; Ulinski, T.; Krid, S.; Fischbach, M.; Harambat, J.; Samaille, C.; Buscher, R.; Oh, J.; Pape, L.; John, U.; Klaus, G.; Billing, H.; Stafanidis, C.; Papachristou, F.; Bagga, A.; Kanitkar, M.; Sinha, R.; Sethi, S.; Verrinam, E.; Vidal, E.; Leozappa, G.; Landau, D.; Ha, I.S.; Paik, K.H.; Bilal, A.; Sahpazova, E.; Lim, Y.N.; Barbosa, L.S.; Groothoff, J.W.; Konijenberg, Y.; Silva, Y.; Al Ryami, M.; Munarriz, R.L.; Leszepanska, B.; Szczepanska, M.; Brumariu, O.; Kari, J.; Kruscic, D.; Yap, H.K.; Ariceta, G.; Aguirre, M.; Santos, F.; Niwhiska-Faryna, B.; Bayazit, A.; Bakkaloglu, C.A.S.; Bakkaloglu, S.; Bilge, I.; Yavascan, O.; Mir, S.; Simkova, E.; Christian, M.; Greenbaum, L.; Neu, A.; Askenazi, D.; Al-Akash, A.; Swartz, S.; Brophy, P.; Rheault, M.; Pradhan, M.
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    Heavy Industrial Asphalt Pavements Design Using Software HIPAVE
    (PONTIFICIA UNIV CATOLICA CHILE, ESCUELA CONSTRUCCION CIVIL, 2009) Pradena, M.; Valenzuela, M.; Molina, P.
    This article discus about the heavy industrial asphalt pavements structural design, through the application of a mechanistic approach for the analysis and design. The heavy industrial pavements are principally characterized for its heavy traffic loads and a relative low number of repetitions. The current design practice is based on purely empirical principles, which have been developed for the design of roads asphalt pavements, and are not applicable for the design of heavy industrial pavements. So, this article contain a full study about the empirical - mechanistic design method, applicated on heavy industrial asphalt pavements analysis and design. Every stage of the method are described, and inputs like traffic loads, material properties and temperature distribution are characterized. A description of the software HIPAVE is presented, which is a software from Australia and was developed for heavy industrial asphalt pavements analysis and design. Also, the applicability of the method and the future research lines for to improve itself are discussed. In complement, a application example is presented, which consist in the design of a asphalt pavement structure, for a sawmill's yard located in Arauco province.
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    Inhibition of cell proliferation and migration by oxidative stress from ascorbate-driven juglone redox cycling in human bladder-derived T24 cells
    (ACADEMIC PRESS INC ELSEVIER SCIENCE, 2012) Kviecinski, M. R.; Pedrosa, R. C.; Felipe, K. B.; Farias, M. S.; Glorieux, C.; Valenzuela, M.; Sid, B.; Benites, J.; Valderrama, J. A.; Verrax, J.; Buc Calderon, P.
    The effects of juglone on T24 cells were assessed in the presence and absence of ascorbate. The EC50 value for juglone at 24 h decreased from 28.5 mu M to 6.3 mu M in the presence of ascorbate. In juglone-treated cells, ascorbate increased ROS formation (4-fold) and depleted GSH (65%). N-acetylcysteine or catalase restricted the juglone/ascorbate-mediated effects, highlighting the role of oxidative stress in juglone cytotoxicity. Juglone alone or associated with ascorbate did not cause caspase-3 activation or PARP cleavage, suggesting necrosis-like cell death. DNA damage and the mild ER stress caused by juglone were both enhanced by ascorbate. In cells treated with juglone (1-5 mu M), a concentration-dependent decrease in cell proliferation was observed. Ascorbate did not impair cell proliferation but its association with juglone led to a clonogenic death state. The motility of ascorbate-treated cells was not affected. Juglone slightly restricted motility, but cells lost their ability to migrate most noticeably when treated with juglone plus ascorbate. We postulate that juglone kills cells by a necrosis-like mechanism inhibiting cell proliferation and the motility of T24 cells. These effects are enhanced in the presence of ascorbate. (C) 2012 Elsevier Inc. All rights reserved.
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    Project management applied to the infrastructure rehabilitation at the Universidad de Concepcion, Chile, following an m8.8 Earthquake
    (2011) Pradena, M.; Valenzuela, M.
    Although the buildings of the Universidad de Concepcion (UdeC) stood up well structurally to the effects of the earthquake on 27 February 2010 in Concepcion, Chile, diverse damage was generated in their non-structural elements. Due to the large number of university buildings (over 100 on the Concepcion Campus alone) and the need to start classes on 5 April, numerous simultaneous repair projects were generated. These were done within the national post-earthquake context and the specific context of the UdeC.
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    Waist circumference percentiles in children and adolescents between 6 and 14 years from Santiago, Chile
    (2012) Avalos, C.; Diaz, C.; Martinez, A.; Bancalari, R.; Zamorano, J.; Harbin, F.; Cerda, V.; Fernandez, M.; Cavada, G.; Arteaga, J.; Valenzuela, M.; Toro, M.; Garcia, H.
    Objective: To describe the percentile distribution of waist circumference (WC) by sex and age in a representative sample of children and adolescents of lower-middle and low socioeconomic status in Santiago, Chile. Methods: A cross-section of 3022 primary-school students between the ages of 6 and 14 from middle-low and low-class schools of Santiago. Ten schools from the Primary Education Society (SIP) in Santiago, Chile, were selected at random. WC was measured under standardized procedures as instructed by the WHO (midpoint between lower costal margin and iliac crest). The population was categorized between percentiles 10 and 90 and divided by sex and age. Results: WC tends to increase with age in both males and females, but no significant differences were found in the percentiles by age for boys and girls at any age range (. p>. 0.05). In our sample, comparing Chilean children with other populations (British, Australian, European-American, African-American, Mexican - American and Colo