Results 41 to 50 of about 5,737 (149)
Estudios sobre el Mensaje Periodístico, 2012 La interactividad y el multimedia son dos de los pilares fundamentales del periodismo digital, junto a la hipertextualidad. Dado su carácter relativamente incipiente, analizamos empíricamente el uso en cabeceras internacionales.
Joan Francesc Fondevila Gascón
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Climate and hybridization shape stomatal trait evolution in Populus
New Phytologist, Volume 249, Issue 2, Page 792-809, January 2026.Summary Stomata play a critical role in regulating plant responses to climate. Where sister species differ in stomatal traits, interspecific gene flow can influence the evolutionary trajectory of trait variation, with consequences for adaptation. Leveraging six latitudinally distributed contact zones spanning the natural hybrid zone between Populus ...
Michelle Zavala‐Paez +4 more
wiley +1 more source
Sensors, 2016 In this work we demonstrate the ability of a multifaceted N,N′-disubstituted urea to selectively recognize fluoride anion (F−) among other halides. This additional function is now added to its already reported organocatalytic and organogelator properties.
Jana Schiller +5 more
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Reduced Offspring Viability Is Associated With Long‐Term Stability of a Narrow Avian Hybrid Zone
Ecology and Evolution, Volume 15, Issue 9, September 2025.We investigated hybrid viability in a tropical, avian hybrid zone governed by strong selection on male secondary sexual traits between the white‐collared manakin (Manacus candei) and golden‐collared manakin (M. vitellinus). We assessed putative hybrid fitness by investigating adult survival and hatching success along with a prospective selective ...
Kira M. Long +5 more
wiley +1 more source
PKI* y firmas digitales: aplicaciones reales
Inventum Ingeniería, Tecnología e Investigación, 2007 El uso de las claves públicas es la base para que se dé el comercio electrónico. Este documento busca sustentar que la administración de la infraestructura de llaves públicas o PKI es la solución para conseguir seguridad de la información en los negocios
Armando Carvajal
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Understanding Chiral Proton Catalysis Using Cinchonium Derivatives in aza‐Michael Additions
Advanced Synthesis &Catalysis, Volume 367, Issue 11, June 3, 2025.Abstract This work presents a detailed mechanistic study of a quininium‐catalyzed aza‐Michael reaction, providing essential information for advancing chiral proton catalysis (CPC). The use of cinchona derivatives as chiral proton catalysts demonstrates their potential beyond their conventional roles as base‐promoted and phase‐transfer catalysts ...
Fernando Auria‐Luna +4 more
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Adición conjugada asimétrica en un derivado del ácido-(2e, 4e)-5-fenilpenta-2,4-dienoico [PDF]
, 2022 "En este trabajo se describe la exploración asimétrica de un dienófilo que hasta la fecha no ha sido estudiado frente a la reacción conjugada de organocupratos.
Gois Saucedo, Juan Antonio
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Multicomponent Cyanation of 2‐Amino‐3‐cyano‐4H‐chromenes in Aqueous Media
Asian Journal of Organic Chemistry, Volume 13, Issue 12, December 2024.Chromenes, especially 2‐amino‐3‐cyano‐4H‐chromene derivatives, are present in biologically active compounds with potential properties, although the number of synthetic methods to date is limited. Here, we report a new protocol using a mild source of cyanide (acetone cyanohydrin), green solvents, and catalytic conditions via a multicomponent approach ...
Sandra Ardevines +5 more
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Estudios Geologicos, 1997 El emplazamiento de granitoides en zonas de desgarre de la corteza superior se ha modelizado inyectando un fluido newtoniano en un paquete de arena en el cual se intercala una capa dúctil de silicona que actúa como un nivel de despegue potencial en el ...
T. Román Berdiel, D. Gapais, J. P. Brun
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Secuelas neurocognitivas de leucomalacia periventricular
Revista Ciencias Biomédicas, 2020 Introducción: la leucomalacia periventricular (LPV) es una necrosis de la sustancia blanca que está ubicada dorsal y lateralmente a los ángulos externos de los ventrículos laterales.
Miriam Barboza Ubarnes +4 more
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