Browsing by Title Facultad de Ciencias
Now showing items 980-999 of 8177
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(Royal Society of Chemestry, 2016)The stability of the LinBnH2n (n = 3-6) series was analyzed using quantum chemical calculations, and it was found that cyclic isomers are not energetically favored. This is different to what happens in their organic ...
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(2011)Boron is an essential trace element for plants and humans however it is still an open question what levels of boron are actually safe for humans. This study, conducted between 2006 and 2010, measured exposure levels of ...
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(Elsevier, 2016)Phytoremediation is a promising technology to tackle boron toxicity, which restricts agricultural activities in many arid and semi-arid areas. Puccinellia frigida is a perennial grass that was reported to hyperaccumulate ...
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(1993)A generalization of the Jordan-Wigner transformation to three (or higher) dimensions is constructed. The nonlocal mapping of spin to fermionic variables is expressed as a gauge transformation with topological charge equal ...
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(Universidad de Chile, 1992)Aetoxicon-punctatum R. et Pavo ("olivillo"), único representante de la Familia Aextoxicaceae, monotípica y endémica de Chile, se distribuye preferentemente a lo largo de la Cordillera de la Costa entre 30° y 43°3. En ...
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(Universidad de Chile, 2003)El Roble Blanco {Nothofagus macrocarpa} es una especie reconocida hace poco tiempo como tal y la información existente sobre ella es muy escasa. Se pretende ampliar el conocimiento de esta especie adoptando para ello una ...
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(ECOLOGICAL SOC AMER, 2011-02)The abundance of exotic plants is thought to be limited by competition with resident species (including plants and generalist herbivores). In contrast, observations in semiarid Chile suggest that a native generalist rodent, ...
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(SPRINGER, 2005-03)Soil nutrient availability directly enhances vegetative growth, flowering, and fruiting in alpine ecosystems. However, the impacts of nutrient addition on pollinator visitation, which could affect seed output indirectly, ...
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(2011)We analyze numerically localization of light in linear square waveguide arrays restricted in one dimension ("ribbons"), whose boundaries are disordered in propagation constant and/or coupling. We find that the disordered ...
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(2012)Using the notion of summable dichotomy in ordinary difference equations and the contraction and Schauder fixed point theorem, we obtain the existence of bounded and periodic solutions on ℤ under quite general hypotheses ...
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(2009)By using the concept of integrable dichotomy, the fixed point theory, functional analysis methods and some new technique of analysis, we obtain new criteria for the existence and uniqueness of bounded and periodic solutions ...
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(American Physical Society, 2014)We examine the PT-symmetry-breaking transition for amagnetic metamaterial of a finite extent, modeled as an array of coupled split-ring resonators in the equivalent circuit model approximation. Small-size arrays are ...
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(Lippincott Williams & Wilkins, 2022)Purpose of review The vascular hypothesis of schizophrenia (SZ) postulates that brain endothelial dysfunction contributes to brain pathophysiology. This review discusses recent evidence for and against this hypothesis, ...
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(Academic Press Inc.apjcs@harcourt.com, 2020)
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(Elsevier, 1997)The present status of the Brazilian AMS program, based on the University of São Paulo 8UD tandem accelerator, is described. Results of tests and developments on voltage stability, focusing, automatic system for changing ...
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(ELSEVIER SCIENCE BV, 2010-07-15)The existenceandstabilityofdiscretebreathersisstudiedtheoreticallyforamodelmagnetic metamaterialcomposedofaperiodicbinaryarrayofsplit-ringresonatorswithresonancefrequency mismatch.Itisdemonstratedthatbreatherscanbeexci ...
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(Revista Biota Neotropica, Brazil, 2021)Breeding biology in a population of Rufous-collared Sparrow (Zonotrichia capensis, Statius Müller, 1776) at different elevations in the Tropical Andes. Elevation strongly influences the evolution of life history ...
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Breeding biology of the Thorn-tailed Rayadito (Furnariidae) in south-temperate rainforests of Chile (COOPER ORNITHOLOGICAL SOC, 2005-02)We conducted a study of the breeding biology of the Thorn-tailed Rayadito (Aphrastura spinicauda) in secondary forests on the continental island of Chiloe (42degreesS), southern Chile. Rayaditos are small insectivorous ...
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(ELSEVIER, 2008)The breeding system determines different ways whereby seeds will be produced, and the degree of dependency of plants on pollinators for seed set. The genus Chloraea (Orchiclaceae) has its main center of diversity in southern ...
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(SOCIEDAD BIOLOGIA CHILE, 2006-06)Plant breeding systems are considered to reflect species' life history characteristics, selection due to biotic or abiotic factors, pollination conditions, or a combination of these. Reproductive systems may vary over ...