Quesada. J.: Sinfonía para un nuevo siglo.

Sin resume

Echeverría, J.: Telépolis.

Sin resume

Corrigendum to "Resource-Monotonicity for House Allocation Problems"

Ehlers and Klaus (2003) study so-called house allocation problems and claim to characterize all rules satisfying efficiency, independence of irrelevant objects, and resource-monotonicity on two preference domains (Ehlers and Klaus, 2003, Theorem 1). They explicitly prove Theorem 1 for preference domain R0 which requires that the null object is always the worst object and mention that the corresponding proofs for the larger domain R of unrestricted preferences "are completely analogous." Quesada (2009) in a recent working paper claims to have found a counterexample that shows that Theorem 1 is not correct on the unrestricted domain R. In Lemma 1, we prove that Quesada's (2009) example in not a counterexample to Ehlers and Klaus (2003, Theorem 1). However, in Example 1 and Lemma 2, we demonstrate how to adjust Quesada's (2009) original idea to indeed establish a counterexample to Ehlers and Klaus (2003, Theorem 1) on the general domain R. Quesada (2009) also proposes a way of correcting the result on the general domain R by strengthening independence of irrelevant objects in two ways: in addition to requiring that the chosen allocation should depend only on preferences over the set of available objects (which always includes the null object), he adds two situations in which the allocation should also be invariant when preferences over the null object change. We here demonstrate that it is sufficient to require only one of Quesada's (2009) additional independence requirements to reestablish the result of Theorem 1 on the general domain R. Finally, while Quesada (2009) essentially replicates the original proofs of Ehlers and Klaus (2003) using his stronger independence condition, here we offer a short proof that uses the established result of Theorem 1 for the restricted domain R0.corrigendum, indivisible objects, resource-monotonicity.

Quesada Quesada, J. J. El Real Monasterio de Santa Clara de Úbeda. Aproximación histórica y patrimonial. Diputación Provincial de Jaén. Jaén: Instituto de Estudios Giennenses, 2020, 302 pp., 141 ils. en color. ISBN: 978-84-92876-68-6.

El Real Monasterio de Santa Clara de Úbeda no es la primera obra con la que nos sorprende José Joaquín Quesada Quesada, doctor en Historia del Arte, pues en el pasado año 2019 ya nos llamó la atención con su trabajo Iglesias de Úbeda y Baeza (Córdoba: Almuzara). No es baladí que Quesada ejerza su labor docente en un Instituto de Educación Secundaría de Begíjar (Jaén), municipio cercano a dichas ciudades Patrimonio de la Humanidad. El desarrollo de sus líneas de investigación sobre iconografía religiosa, y en concreto las avanzadas a partir de su tesis doctoral Iconografía franciscana en la provincia de Jaén: del siglo XIII a la desamortización de 1836, leída en la Universidad de Jaén en el año 2017, le ha llevado a profundizar en una de las primeras fundaciones franciscanas de Andalucía, el monasterio de clarisas de Úbeda, cuyos orígenes se remontan al siglo XIII. Como consecuencia, en su riquísima arquitectura se yuxtaponen elementos mudéjares, góticos, renacentistas y barrocos, y en su patrimonio mueble piezas de gran valor como por ejemplo pinturas del siglo XVII

Nanostructural differences in pectic polymers isolated from strawberry fruits with low expression levels of pectate lyase or polygalacturonase genes

Our research group has obtained transgenic strawberry plants expressing antisense sequences of either a pectate lyase (APEL lines) [1] or a polygalacturonase gene (APG lines) [2]. Both genes encode ripening-specific endo-pectinases with a common target, deesterified homogalacturonans, but each enzyme act by a different mechanism and pH range. Ripe fruits from both transgenic genotypes were significantly firmer than control, being APG fruits on average 25% firmer than APEL fruits. Cell wall analysis of both transgenic genotypes indicated that pectin fractions extracted with CDTA and sodium carbonate were significantly modified in transgenic fruits [2,3]. To gain insight in the role of these pectinases in pectin disassembly during ripening, CDTA and Na2CO3 pectins have been analyzed by atomic force microscopy (AFM). APEL and APG CDTA pectins had similar contour lengths but both were significantly longer than control. Similarly, APG carbonate chains were longer than control, showing APEL carbonate chains an intermediate length. Furthermore, transgenic pectins displayed a more complex branching pattern and a higher number of micellar aggregates, especially in the sodium carbonate fractions of APG samples. Acid hydrolysis of carbonate pectins reduced the number of micellar aggregates. AFM analyses confirm that the inhibition of both pectinases reduces pectin disassembly, and also suggest that each pectinase acts on specific pectin domains. Particularly, polygalacturonase silencing induces more significant pectin modifications, nicely correlated with the firmer phenotype of APG fruits, than the down-regulation of pectate lyase

Trade, expropriation and allocation

Allocation rules map preference profiles into allocations, whereas trading rules map preference profiles and allocations into allocations. It is shown that no allocation rule can derive from a trading rule based on voluntary trade and satisfying a weak efficiency condition. If the trading rule allows compulsory trade then the only allocation rules that can derive from a trading rule satisfying certain additional mild conditions are those having a hierarchy of dictators. These results contribute to accentuate the difference between centralized and decentralized allocation mechanisms.Allocation rules, Compulsory trade, Hierarchy of dictators, Trading rules

Quesada. J.: Sinfonía para un nuevo siglo.

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Fundador del movimiento ecologista en Costa Rica: Ricardo Quesada López - Calleja

Ricardo Quesada López-Calleja was born in Barrio Amón, San José, Costa Rica on August 31, 1929. He was the youngest son of Víctor Quesada Carvajal and Hortensia López-Calleja Mora.  Educated both in private and public schools, he graduated as a lawyer from the University of Costa Rica.  As a teenager, he worked in the Castro & Quesada Warehouse with his father. It is said that it was Quesada López-Calleja who started and transformed foreign trade in Costa Rica by establishing business relationships with different Eastern European countries, where he was appointed Ambassador.  In the 70’s, he taught in the Escuela Normal Superior, and in the School of Political Science at the University of Costa Rica. Quesada published different iconographies from leaders of the world, some other works related to archeological artifacts in the National Museum, and his masterpiece Costa Rica. La Frontera Sur de Mesoamérica.  Founder of the environmental movement in Costa Rica, he created along with a group of students, professors, and friends, the National Patrimony Defense Committee on April 24, 1970. Later on, he participated in important environmental efforts seeking to protect the country’s archaeological and natural patrimony, to introduce an environmental amendment in the Constitution of Costa Rica (Art. 50), and to enact the Environmental Law. Ricardo Quesada López-Calleja died on January 31, 1994, and, as the founder of the environmental movement, this was his legacy to the people of Costa Rica.Ricardo Quesada López-Calleja nace en el Barrio Amón, San José, Costa Rica, un 31 de agosto de 1929. Fue el hijo menor de Víctor Quesada Carvajal y Hortensia López-Calleja Fuentes. Estudió en escuelas públicas y privadas y se gradúa como abogado y notario en la Universidad de Costa Rica. Trabajó con su padre en el Almacén Castro y Quesada durante su juventud. Inicia y transforma el comercio exterior en Costa Rica al establecer relaciones comerciales con diversos países de Europa del Este, donde fue nombrado como embajador. En la década de los años 70 fue profesor en la Escuela Normal Superior de Costa Rica y en la Escuela de Ciencias Políticas de la Universidad de Costa Rica. Publica diversas iconografías de próceres, como de las principales piezas arqueológicas del Museo Nacional, así como su obra principal, Costa Rica. La Frontera Sur de Mesoamérica (Premio Nacional Aquileo J. Echeverría, 1980). Funda el movimiento ecologista en Costa Rica y crea el Comité de Defensa del Patrimonio Nacional (CDPN) el 24 de abril de 1970, junto con un grupo de estudiantes, profesores y amigos. Participa en múltiples luchas en defensa del patrimonio arqueológico y natural nacional e internacional, así como en el establecimiento de leyes en estos campos. En especial, la incorporación del párrafo segundo del artículo 50 de la Constitución Política de Costa Rica y la redacción del Código del Ambiente. Como fundador del movimiento ecologista, esta es la herencia que dejó Ricardo Quesada López-Calleja a los costarricenses, quien fallece en la ciudad de San José, el 31 de enero de 1994