325 resultados para Federico Sánchez


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[EN] The "Christian Scientia" as it is presented in "De Doctrina Christiana" has two aspects: inventio, which corresponds to intellectio, to the understanding of the Holy Writings, and, on other hand, the exposition of the results obtained. These two sides are closely linked in his ideal of oratory: "dicere sapienter et eloquenter". On trying to acquire eloquence the main point is the "familiaritas" with the models, and these are the Writings and the Christian authors, the only models, as for content and form, that must be of any interest to the Christian orator. From this point of view the place left for standard rhetoric is very small.

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The Las Herrerias volcano (Bolanos de Calatrava, Campo de Calatrava Volcanic Field) is characterized by the great amount and variety of fire-fountain fed deposits. All these deposits are compositionally similar, being constituted by magnesium-rich (MgO = 11.58-4.19%), aluminium-poor (Al2O3 = 9.64-10.99%) highly sodic (Na2O = 2.24-3.81%) melanephelinites, with high contents in rare earth-elements (10x-200x chondrite), particularly in light-rare earth elements with respect to the heavy ones [(La/Lu)(N) = 32-35]. Contrary to the equivalent melanephelinites of this volcanic field, the relatively low contents in Ni (233-286 ppm), Cr (393-520 ppm) and magnesium number (Mg* = 45-54) indicate that these rocks do not correspond with primary melts. On the other hand, the variable distribution of clinopyroxene in the magma during eruption would be responsible for the slight compositional differences observed in the studied samples. Finally, we argue that these fire fountains were developed in a continental intraplate setting.

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Several pseudo-binary RxR2-x'Fe-17 alloys (with R = Y, Ce, Pr, Gd and Dy) were synthesized with rhombohedral Th2Zn17-type crystal structure determined from x-ray and neutron powder diffraction. The choice of compositions was done with the aim of tuning the Curie temperature (T-C) in the 270 +/- 20 K temperature range, in order to obtain the maximum magneto-caloric effect around room temperature. The investigated compounds exhibit broad isothermal magnetic entropy changes, Delta S-M(T), with moderate values of the refrigerant capacity, even though the values of Delta S-M(Peak) are relatively low compared with those of the R2Fe17 compounds with R = Pr or Nd. The reduction on the Delta S-M(Peak) is explained in terms of the diminution in the saturation magnetization value. Furthermore, the Delta S-M(T) curves exhibit a similar caret-like behavior, suggesting that the magneto-caloric effect is mainly governed by the Fe-sublattice. A single master curve for Delta S-M/Delta S-M(Peak)(T) under different values of the magnetic field change are obtained for each compound by rescaling of the temperature axis.

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[ES] La tragedia griega exige, para su comprensión, remitirse al contexto social y cultural en que fue compuesta. Tomar como referente el conocimiento que nosotros tenemos del modo de vida y pensamiento de entonces es algo fundamental, si se quiere entender la forma de actuar de las mujeres y de los hombres trágicos, como Alcestis y Admeto. Vistos bajo esta perspectiva, dejan de ser la heroína romántica y el pérfido esposo, para convertirse ella en el paradigma del ideal femenino en una sociedad donde el padre es el miembro más preciado de la familia, y él en el varón irreprochable. Todo esto bajo un discurso, el trágico, que se complace en difuminar la frontera mediadora entre lo masculino y lo femenino.

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[ES] Nuestra intención en este trabajo consiste en examinar en qué medida Amiano acoge en su obra la consideración convencional negativa de los eunucos y, en segundo lugar, observar si esto le conduce a una utilización de este colectivo como medio de caracterización de la oposición entre buenos y malos emperadores basada en la utilización que de ellos hacen los monarcas.

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In order to accurately assess the influence of fatty acids on the hygroscopic and other physicochemical properties of sea salt aerosols, hexanoic, octanoic or lauric acid together with sodium halide salts (NaCl, NaBr and NaI) have been chosen to be investigated in this study. The hygroscopic properties of sodium halide sub-micrometre particles covered with organic acids have been examined by Fourier-transform infrared spectroscopy in an aerosol flow cell. Covered particles were generated by flowing atomized sodium halide particles (either dry or aqueous) through a heated oven containing the gaseous acid. The obtained results indicate that gaseous organic acids easily nucleate onto dry and aqueous sodium halide particles. On the other hand, scanning electron microscopy (SEM) images indicate that lauric acid coating on NaCl particles makes them to aggregate in small clusters. The hygroscopic behaviour of covered sodium halide particles in deliquescence mode shows different features with the exchange of the halide ion, whereas the organic surfactant has little effect in NaBr particles, NaCl and NaI covered particles experience appreciable shifts in their deliquescence relative humidities, with different trends observed for each of the acids studied. In efflorescence mode, the overall effect of the organic covering is to retard the loss of water in the particles. It has been observed that the presence of gaseous water in heterogeneously nucleated particles tends to displace the cover of hexanoic acid to energetically stabilize the system.

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419 p.

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[eus] Bizkaiko ikastetxe batean proiektuak egin izan dira, ikasleriaren interesak kontuan hartu gabe. Interes horiek kontuan izateko, ikaskuntza komunitate birtuala sortzea erabaki zen. Birtuala izanik, teknologia berrien erabilera sustatzea espero zen. Ikaskuntza komunitate birtuala web orrialde batean sortu zen, non partaide ororen artean proiektu bat diseinatzeaz gain, ekintzetan erabiltzeko baliabideak eratzeko aukera ematen zen bertan. Webguneak hasierako zirriborrotik aldaketak izan zituen, aztertzen ziren gabeziak edota beharrak asetzeko. Ikaskuntza komunitate birtuala prest egonda ere, ez zen aurrera eraman denbora faltagatik. Horrela, web orrialdean proiektua diseinatzeko eta partaideek diseinatutako proiektua burutu ahal izateko, ikasturte hasieratik diseinatu beharko litzateke.

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El presente TFG tiene como objeto de estudio la regulación del aborto que ha existido en España desde que entró en vigor la Constitución Española el 29 de diciembre de 1978. Todo ello con el fin de demostrar que el Anteproyecto de Ley Orgánica para la protección del concebido y de los derechos de la mujer embarazada que había elaborado el actual Gobierno del Partido Popular iba en contra de la tendencia que se sigue hoy en día en la regulación de esta cuestión. En efecto, el citado Anteproyecto no sólo era más retrógrado en comparación con la regulación existente en los estados europeos de nuestro entorno, sino también, y esto es lo más llamativo por tratarse de tres estados islámicos de corte conservador, con la regulación vigente en Túnez, Turquia y Marruecos. Finalmente, remarcamos la noción de libertad como pilar fundamental de toda esta compleja cuestión, la cual nos lleva a mostrarnos partidarios del derecho a la maternidad libremente decidida.

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Current research efforts are focused on the application of growth factors, such as glial cell line-derived neurotrophic factor (GDNF) and vascular endothelial growth factor (VEGF), as neuroregenerative approaches that will prevent the neurodegenerative process in Parkinson's disease. Continuing a previous work published by our research group, and with the aim to overcome different limitations related to growth factor administration, VEGF and GDNF were encapsulated in poly(lactic-co-glycolic acid) nanospheres (NS). This strategy facilitates the combined administration of the VEGF and GDNF into the brain of 6-hydroxydopamine (6-OHDA) partially lesioned rats, resulting in a continuous and simultaneous drug release. The NS particle size was about 200 nm and the simultaneous addition of VEGF NS and GDNF NS resulted in significant protection of the PC-12 cell line against 6-OHDA in vitro. Once the poly(lactic-co-glycolic acid) NS were implanted into the striatum of 6-OHDA partially lesioned rats, the amphetamine rotation behavior test was carried out over 10 weeks, in order to check for in vivo efficacy. The results showed that VEGF NS and GDNF NS significantly decreased the number of amphetamine-induced rotations at the end of the study. In addition, tyrosine hydroxylase immunohistochemical analysis in the striatum and the external substantia nigra confirmed a significant enhancement of neurons in the VEGF NS and GDNF NS treatment group. The synergistic effect of VEGF NS and GDNF NS allows for a reduction of the dose by half, and may be a valuable neurogenerative/neuroreparative approach for treating Parkinson's disease.

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Based on numerous pharmacological studies that have revealed an interaction between cannabinoid and opioid systems at the molecular, neurochemical, and behavioral levels, a new series of hybrid molecules has been prepared by coupling the molecular features of two well-known drugs, ie, rimonabant and fentanyl. The new compounds have been tested for their affinity and functionality regarding CB1 and CB2 cannabinoid and mu opioid receptors. In [S-35]-GTP.S (guanosine 5'-O-[gamma-thio] triphosphate) binding assays from the post-mortem human frontal cortex, they proved to be CB1 cannabinoid antagonists and mu opioid antagonists. Interestingly, in vivo, the new compounds exhibited a significant dual antagonist action on the endocannabinoid and opioid systems.

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[eus] Hiru pantailez osatutako bideoinstalazioa, zeinekin ikus-entzunezko lanetan hain ohikoa den linealtasuna apurtzen da. Sentimenduen barne mundua uztartuko da istorioa kontatzeko bide ezberdinak dauzkan lan honekin, eta proiektuaren premisa hurrengoa izango litzateke:Iluntasunean eta bakardadean baino ez gara ausartzen gure sekretu latzenak kontatzera. Une bakarrean sentimendu guztiak jasan ditzakegu baina dena burura datorkigunean, pentsatzea areriorik bortitzena bilakatzen da. Bi heriotza krudelen oroitzapenetatik aldentzea ez da erraza, horregatik, itzal horietatik ihes egin ahal izateko, biharamuna existituko ez balitz bezala aurrera jarraitzea nahitaezkoa da.