Browsing by Author "Jara, P."

Now showing 1 - 7 of 7
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    A dominance solvable global game with strategic substitutes
    (2015) Harrison Vergara, Rodrigo José; Jara, P.
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    An effective and selective route to 1,5-dihydropolyalkylated s-indacenes: Characterization of their mono- and dianions by silylation. Structure of trans-1,5-bis(trimethylsilyl)-2,6-diethyl-4,8-dimethyl-s-indacene
    (2001) Dahrouch, M.R.; Jara, P.; Méndez Schafer, Loreto Margarita; Portilla Valle, Yoany; Abril Milan, Diana Rosa; Alfonso Hernández, Geraldo; Chávez Madariaga, Ivonne; Manríquez M., Juan Manuel; Riviere-Baudet, M.; Riviere, P.; Castel, A.; Rouzaud, J.; Gornitzka, H.
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    Leaf morphological and genetic divergence in populations of Drimys (Winteraceae) in Chile
    (2012) Jara, P.; Carmona Ortíz, Martín Rubén; Correa Quezada, Claudio Luis
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    Re-Introduction of Quinoa into Arid Chile: Cultivation of Two Lowland Races under Extremely Low Irrigation
    (WILEY, 2009) Martinez, E. A.; Veas, E.; Jorquera, C.; San Martin, R.; Jara, P.
    Annual rainfall in Chile at 30 degrees S decreased from 170 to 70 mm in the last century, forcing a search for new low-rain adapted crops. Chenopodium quinoa Willd. was cultivated by pre-Hispanic cultures, but it disappeared in this region since the Spanish conquest. Two quinoa landraces (Don Javi and Palmilla) were re-introduced from lowlands of central Chile (34 degrees S) evaluating seed saponin content and grain yields under low irrigation. Replicated assays were conducted in two sites with distinct microclimates after august (end of the rains in 2004 and 2005). Treatments included low (40-75 mm) and high (150-250 mm) irrigation and were distributed along the five cultivation months. Fertilization, with the humus of the worms, was carried out in the second season, as soils are poor in organic matter. Results showed significantly higher saponin content in the seeds of Don Javi landrace (1.2 %) with respect to Palmilla seeds (0.3 %). However, grain yields were not different between landraces under the same treatments. Yields were instead affected by microclimate, irrigation and fertilization. Although higher yields corresponded with higher irrigation, 2.6 tons ha(-1) was obtained under high irrigation, but surprisingly, also under low irrigation in the more humid site. Yields of 2006 harvesting season (ca. 7 tons ha(-1)) were higher than that of the previous season (ca. 5.5 tons ha(-1)), mainly because of the addition of organic matter. We suggest that re-introduction of Quinoa in arid Chile is feasible even under the prevailing conditions of low rainfall and deficient soils, but better yields will need some irrigation and addition of organic matter.
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    The effects of differential shortening and competent blocks on the structural development of Andean fold-and-thrust belts at 32°-34°S: Insights from analogue models
    (2023) Jara, P.; Herrera, S.; Villarroel, M.; Pinto, L.; Yagupsky, D.; Guzman, C.; Gutiwrrez, M.
    Andean fold-and-thrust belts (FTBs) in the western border of South America show important along-strike variations in their structural style (thin- or thick-skinned) and shortening magnitudes, among others. These variations can arise from multiple factors, such as depth-to-detachment, geometry, and thickness of underlying basins, structural highs, the competence of the units involved in deformation, pre-orogenic structure of the basement, the rheological state of the upper crust or latitudinal gradients in shortening, among others. We carry out a set of new analogue models to understand how two of these factors affect the development and the geometry of the thrust systems within the Andean Principal Cordillera and adjacent fold-and-thrust belts at 32 & DEG;-34 & DEG;S (La Ramada and Aconcagua FTBs). In this contribution, we present the results of analogue modeling of doubly-vergent thrust systems with a built-in heterogeneity that allow us to evaluate the influence of differential shortening and presence of competent blocks (of relatively higher cohesion) in the generation, evolution, and structural setting of Andean FTBs. We highlight that despite the similar pattern of differential shortening in the models, the presence of the competent block has a significant influence on the structural configuration and leads to greater topographic uplift. Differential shortening plays a role in accommodating deformation, but when a competent block is present, the faults bounding the block control the deformation, producing a notable curvature of the FTBs. Summarizing, the presence of a competent block significantly influences the structural configuration within a doubly-vergent thrust system, emphasizing the role of inherited architecture in the orogenic growth of the Southern Central Andes.
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    Todas las Formas de Vida Se Transmiten a Través del DNA o RNA?
    (2001) Jara, P.; Sáez, Juan Carlos
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    Uniones Intercelulares Comunicantes y Respuesta Inflamatoria
    (2001) Jara, P.; Boric P., Mauricio; Sáez, Juan Carlos