Annabella (El pentágono) de Antonio Di Benedetto : aproximaciones a una poética de la ficción

A partir de la idea de que las obras literarias pueden instaurar, dentro de su propia estructura, claros y profundos planteos sobre conceptos como realidad, ficción, y verdad ficcional. se indaga la poética de la ficción que de modo implícito se inscribe en la obra de Antonio Di Benedetto, más precisamente en El pentágono; novela en forma de cuentos, texto de corte experimental publicado por vez primera en 1955, en el que se presta especial atención a las relaciones entre realidad y ficción, a la posibilidad de la ficción de instituir mundos diversos y a los límites y juegos especulares entre ambos dominios. Por otra parte, se observa, en la peculiar construcción de esta novela en forma de cuentos, una estructura que en sí misma es signo del concepto de ficción que domina la obra.

Interaction of water with the fluorine-covered anatase TiO2(001) surface

The interaction of water with the fluorine-covered (001) surface of anatase titanium dioxide (TiO2) has been studied within the framework of density functional theory (DFT). Our results show that water dissociation is unfavorable due to repulsive interactions between surface fluorine and oxygen. We also found that the reaction of hydrofluoric acid with a surface hydroxyl group to form a surface Ti–F bond is exothermic, while the removal of fluorine from the surface needs additional energy of about half an eV. Therefore, water molecules are predicted to remain intact at the interface with the F-terminated anatase (001).

La biblioteca en la educación de adultos.

La biblioteca es un instrumento y debe subordinarse al cumplimiento de unos fines que la actividad cultural persigue. En este caso se trata de la educación de adultos. Desde sus orígenes, han cambiado los intereses y los usuarios. Actualmente se ha desarrollado un nuevo concepto que trata de incorporar a un grupo de edad, excluido hasta que se implantó el concepto de educación permanente a lo largo de la vida y era lógico que llegase a este grupo. Para este fin, la biblioteca es el lugar idóneo para que el alumno pueda completar su instrucción, ayudado por personas como son los animadores culturales que contribuirán a ampliar su formación cultural. Además, de animarles en su cometido. También se deben adecuar los fondos de la biblioteca. Deben ser sencillos en su compresión, adecuados a las posibilidades y características de sus lectores. Berelson, Bernard: Who reads what books and why?. En Rosemberg, B. y White, D,M.: Mass cultures, the popular art un American. The tree Pres of Glencoe, 1957 Dumadier, Joffre: Sciolologie de la lecture et sociologie de lïeducation en le courrier de la recherche pédagoghique. Paris, octubre de 1960; Harrison, J. F.C.: Learnig and living 1790-1960. A study in the history of the englis adult education movement, Routledge and Kegan Paul. Londres, 2 ed., 1963. Janus, la revolution do loisir, núm. 7, Paris , junio-agosto, 1965; López de la Viesca, Evaristo: El foro literario. Educación de adultos a través de la lectura. Ediciones Marsiega. Madrid, 1972;-Maillo, Adolfo: Educación de adultos, educación permanente. Editorial Escuela Española. Madrid, 1969; Piccones Stella, Simonetta y Rossi, Annabella: La fatica di leggere. Editori Reuniti. Roma, 1965.

Identification of adsorbed molecules via STM tip manipulation: CO, H₂O, and O₂ on TiO₂ anatase (101)

While Scanning Tunneling Microscopy (STM) has evolved as an ideal tool to study surface chemistry at the atomic scale, the identification of adsorbed species is often not straightforward. This paper describes a way to reliably identify H2O, CO and O2 on the TiO2 anatase (101) surface with STM. These molecules are of a key importance in the surface chemistry of this and many other (photo-) catalytic materials. They exhibit a wide variety of contrasts in STM images, depending on the tip condition. With clean, metallic tips the molecules appear very similar, i.e., as bright, dimer-like features located in the proximity of surface Ti5c atoms. However, each species exhibits a specific response to the electric field applied by the STM tip. It is shown that this tip–adsorbate interaction can be used to reliably ascertain the identity of such species. The tip–adsorbate interactions, together with comparison of experimental and calculated STM images, are used to analyse and revisit the assignments of molecular adsorbed species reported in recent studies.

Adsorption of biomedical coating molecules, amino acids, and short peptides on magnetite (110)

Superparamagnetic iron oxide nanoparticles for biomedical applications are usually coated with organic molecules to form a steric barrier against agglomeration. The stability of these coatings is well established in the synthesis medium but is more difficult to assess in physiological environment. To obtain a first theoretical estimate of their stability in such an environment, we perform density functional theory calculations of the adsorption of water, polyvinyl alcohol (PVA) and polyethylene glycol (PEG) coating molecules, as well as the monomer and dimer of glycine as a prototype short peptide, on the (110) surface of magnetite (Fe3O4) in vacuo. Our results show that PVA binds significantly stronger to the surface than both PEG and glycine, while the difference between the latter two is quite small. Depending on the coverage, the wateradsorption strength is intermediate between PVA and glycine. Due to its strongly interacting OH side groups, PVA is likely to remain bound to the surface in the presence of short peptides. This stability will have to be further assessed by molecular dynamics in the solvated state for which the present work forms the basis.