Browsing by Title Artículos de revistas
Now showing items 3712-3731 of 4967
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(American Chemical Society, 2020)Reduction of carbonyl moieties to the corresponding alcohol using simply hydrazine hydrate has been considerably unfeasible until now due to the well-known condensation reaction. However, herein, we report that using an ...
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(1997)We report the reaction of gallic acid with chloroacetic acid and three equivalents of sodium hydroxide. In this reaction, 2,6-dihydroxy-4-carboxyphenoxyacetic acid (A) is produced instead of 2,3-dihydroxy-5-carboxyphenoxyacetic ...
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(2007)A vibrational study of the calix[4]arene derivative 25,26,27,28-tetracarboethoxy-p-tert-butylcalix[4]arene (TCEC) is accomplished in this work. This characterization implies a study of its adsorption on metal (Cu and Ag) ...
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(Taylor and Francis Ltd., 2019)Concerns about poor L1 reading skills in undergraduate students have been expressed in several contexts. These skills form a basis for building robust L2 reading comprehension skills, vital for translators. This study, ...
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(Ediciones Universidad de Concepción, 2017)Este estudio constituye una contribución al conocimiento de la concepción descriptivo-mítica de la naturaleza vegetal en la época homérica, realizado sobre la base de las referencias botánicas y etnobotánicas consignadas ...
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(2016)Jubaea chilensis is an endemic tree of Central Chile (31 degrees 15'-35 degrees 22'S). The current main conservation threats for this species should be associated with different factors which limit its natural regeneration, ...
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(2007)Mechanosensory hair cells are essential for audition in vertebrates, and in many species, have the capacity for regeneration when damaged. Regeneration is robust in the fish lateral line system as new hair cells can reappear ...
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(2003)1. We studied the importance of fallen logs as recruitment sites for tree species, their role in species coexistence, and also the influence of canopy openness and litter depth on tree species establishment in mid-successional ...
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(2008)The persistence of rainforest patches at Fray Jorge National Park (FJNP) in semiarid Chile (30°40′S), a region receiving approximately 147mm of annual rainfall, has been a source of concern among forest managers. These ...
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(2007)The establishment of exotic trees such as Pinus radiata (radiata pine, Pinaceae) and Eucalyptus globulus (eucalyptus, Myrtaceae) in fragments of native vegetation at the Parque Nacional Tunari (PNT, Cochabamba-Bolivia), ...
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(2014)During April-May 2004 the Cruces River wetland ecosystem, located in Valdivia (40ºS), southern Chile, was described as shifting from a clear water regime, dominated by the exotic macrophyte Egeria densa, to turbid waters ...
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(Pontificia Universidad Católica de Valparaíso, 2014)Durante abril-mayo 2004 el ecosistema del humedal del río Cruces, localizado en Valdivia (40ºS), en el sur de Chile, fue descrito como cambiando de un régimen de aguas claras, dominado por la macrófita introducida Egeria ...
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(Escuela de Ciencias del Mar, 2014)During April-May 2004 the Cruces River wetland ecosystem, located in Valdivia (40°S), southern Chile, was described as shifting from a clear water regime, dominated by the exotic macrophyte Egeria densa, to turbid waters ...
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(ACS, 2014)The origin of catalysis and selectivity induced by room temperature ionic liquids in several organic reactions has putatively been associated with the concept of cation ef fect (hydrogen bond donor ability of the ionic ...
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(Oxford University Press, 2020)Habitat structure may have a significant influence on the occurrence, abundance, and activity patterns of forest mammals. However, anthropogenic habitat disturbance changes habitat structure, which may alter those patterns ...
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(John Wiley & Sons, 1992-05-06)lhe ring opening reaction of (methylenedioxy)benzenes 1 with propanethiolate in DMF leads to products 2 and:or 3, depending on the nature of the electron-withdrawing substituent Z.
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(Elsevier Ltd, 1999)The Diels-Alder reactions of 8,8-dimethylnaphtalene-1,4,5(8H)-trione with 2,4-hexadien-1-ol and its O-acetyl derivative were investigated in different solvents. The regiochemistry of the cycloaddition of the hexadienol was ...
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(Universidad de Magallanes, 2020)
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(American Physical Society, 2014)In the hope of making passenger travel times shorter and more reliable, many cities are introducing dedicated bus lanes (e.g., Bogota, London, Miami). Herewe showthat chaotic travel times are actually a natural consequence of ...