3,748 research outputs found
El Diccionario morfológico de francés medieval de Carmen Cortés Zaborras
El sitio web del grupo de investigación Traductología, formado por profesores de las Universidades de Málaga y Granada y de la Escuela de Traductores de Toledo de la Universidad de Castilla-La Mancha, contiene en una de sus páginas la editorial virtual del grupo, en la que se hallan publicados libros en formato electrónico accesibles a cualquier usuario de la red que entre en la dirección http://traductolog.filosofia.uma.es. Entre ellos encontramos los dos primeros tomos, en formato .pdf, del Diccionario morfológico de francés medieval realizado por Carmen Cortés Zaborras, profesora del Departamento de Filología Inglesa, Francesa y Alemana, área de Filología Francesa, de la Universidad de Málaga.Tal como indica la autora en la introducción al primer tomo, que lo es a su vez a la obra completa, la finalidad de este trabajo es eminentemente pedagógica; pretende ser una herramienta para aquellos estudiantes de Filología francesa que se acercan a los textos en lengua medieval. Se trata de un complemento muy útil a los diccionarios de naturaleza léxico-semántica en los que las informaciones gramaticales suelen reducirse a la clase y a la categoría del género y, sólo excepcionalmente, cuando el nominativo y el acusativo son diferentes se recogen como tales..
Mastering the reactivity of gold (i) carbenes
Esta tesis doctoral se ha centrado en el estudio experimental de la ciclación catalizada por oro de 1,5-eninos con un grupo electroatractor en la posición alílica que permite obtener selectivamente 1,4-dienos o biciclo[3.1.0]hexenes modulando la electrofilia del catalizador. Mecanísticamente es una ciclación 5-endo-dig en la que se forma un ciclopropil carbeno de Au como intermedio, que a su vez puede reaccionar in situ con nucleófilos como H2O, ROH, aldehídos ó nucleófilos carbonados. También se estudió la adición de nucleófilos carbonados a los intermedios en la migración 1,2 y 1,3 de carboxilatos propargílicos catalizada por Au(I). Por otro se ha demostrado que la reacción intermolecular entre alquenos y alquinos catalizada por Au(I) es factible si se utilizan ligandos voluminosos de modo que el oro se coordine selectivamente al alquino. Es una reacción muy general y limpia que abre camino al desarrollo de nuevos procesos intermoleculares catalizados por oro. In this work, we have studied the gold(I)-catalyzed cyclization of 1,5-enynes bearing an electron-withdrawing group at the allylic position that allows to control its reactivity: 1,4-dienes or bicycle[3.1.0]hexenes can be obtained by tuning the electrophilicity of the gold catalyst. The proposed mechanism begins by 5-endo-dig cyclization to form gold(I) cyclopropyl intermediates that can be trapped in situ with nucleophiles like H2O, ROH, aldehydes or carbon nucleophiles (electron rich arenes and 1,3-dicarbonyl compounds). The addition of carbon nucleophiles to the intermediates of 1,2- and 1,3-rearrangement of propargyl carboxilates catalyzed by gold(I) has been also studied in this work. We also have shown that the intermolecular reaction between allenes and alkynes is feasible using gold(I) complexes with bulky ligands that selectively activate alkynes in the presence of alkenes, which opens opportunities for the development of new gold-catalyzed intermolecular processes
Hypothalamic and mesencephalic regions involved in the control of laryngeal activity and subglottic pressure in spontaneously breathing anaesthetized rats
Changes of laryngeal caliber allow changes in airflow which are necessary for the vibration of the vocal folds and emission of voice. It is known that stimulation of the Periaqueductal Gray matter (PAG) and nucleus retroambiguus (nRA) produces vocalization, and lesions in PAG cause mutism in animals and humans. The nRA is the perfect target to turn passive into active expiration modifying the activity of laryngeal motoneurons located in the nucleus ambiguous (Paton and Nolan, 2000). We have shown that rostral and ventral pontine structures are involved in changes of laryngeal caliber (Lara et al., 2002). It has been also demonstrated a high expression of FOXP2 protein (transcription factor related to vocalization) at mesencephalic and pontine regions (PAG, Parabrachial complex and A5 Region) involved in cardiorespiratory control. The aim of this study was to characterize the relations between hypothalamic and mesencephalic regions involved in cardiorespiratory control and their possible role in modulating laryngeal activity.
Experimental studies were carried out with non-inbred male rats (n=7), SPF, Sprague-Dawley (250-300 g) housed under standard conditions. Animals were anesthetized with sodium pentobarbitone (60 mg/kg i.p., initial dose, supplemented 2 mg/kg, i.v., as necessary). A double tracheal cannulation to develop the classical technique of the “glottis isolated in situ” and for the recording of respiratory airflow was carried out.
DMH-PeF, dlPAG, and CnF stimulations evoked a significant decrease of laryngeal resistance (subglottal pressure) (p<0.01) accompanied with an inspiratory facilitatory response consisted of an increase in respiratory rate, together with a pressor and tachycardic response.
The results of our study contribute with new data on the role of the hypothalamic-mesencephalic neuronal circuits in the control mechanisms of subglottic pressure and laryngeal activity.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec
Valorization of keratin biofibers for removing heavy metals from aqueous solutions
Four common waste keratin biofibers (human hair, dog hair, chicken feathers, and degreased wool) have been used as biosorbents for the removal of heavy metal ions from aqueous solutions. Different parameters of the biosorption processes were optimized in batch systems. For multiple-metal systems, consisting of a mixture of eight metal ions [Cr(III), Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Pb(II)], the total metal biosorption increased in the order: degreased wool¿>¿chicken feathers¿>¿human hair¿>¿dog hair. From the kinetic models tested, the pseudo-second-order model provided better results. Furthermore, biosorption isotherms of Pb(II) with the different keratin biofibers fitted the Langmuir model. Surface morphology of the biosorbents were analyzed before and after the sorption using Fourier transform infrared spectroscopy and scanning electron microscopy. The keratin biofibers tested are potentially good sorbents of metal ions, with degreased wool and chicken feathers being the more efficient onesPostprint (author's final draft
Program development using abstract interpretation (and the ciao system preprocessor)
The technique of Abstract Interpretation has allowed the development of very sophisticated global program analyses which are at the same time provably correct and practical. We present in a tutorial fashion a novel program development framework which uses abstract interpretation
as a fundamental tool. The framework uses modular, incremental abstract interpretation to obtain information about the program. This information is used to validate programs, to detect bugs with respect to partial specifications written using assertions (in the program itself and/or in system librarles), to genérate and simplify run-time tests, and to perform high-level program transformations such as múltiple abstract specialization, parallelization, and resource usage control, all in a provably correct way. In the case of validation and debugging, the assertions can refer to a variety of program points such as procedure entry, procedure exit, points within procedures, or global computations. The system can reason with much richer information than, for example, traditional types. This includes data structure shape (including pointer sharing), bounds on data structure sizes, and other operational variable instantiation properties, as well as procedure-level properties such as determinacy, termination, non-failure, and bounds on resource consumption (time or space cost). CiaoPP, the preprocessor of the Ciao multi-paradigm programming system, which implements the described functionality, will be used to illustrate the fundamental ideas
- …