Recursos de colección

E-Prints Complutense (110.438 recursos)

En este archivo los docentes e investigadores de la UCM depositan sus documentos en acceso abierto (open access)

Estado = Publicado

Mostrando recursos 1 - 20 de 4.516

  1. Increased Ap4A levels and ecto-nucleotidase activity in glaucomatous mice retina

    Pérez de Lara, María Jesús; Guzmán Aránguez, Ana Isabel; Gómez Villafuertes, María Rosa; Gualix, Javier; Miras Portugal, María Teresa; Pintor, Jesús
    The pathogenesis of glaucoma involves numerous intracellular mechanisms including the purinergic system contribution. Furthermore, the presence and release of nucleotides and dinucleotides during the glaucomatous damage and the maintenance of degradation machinery through ecto-nucleotidase activity are participating in the modulation of the suitable extracellular complex balance. The aim of this study was to investigate the levels of diadenosine tetraphosphate (Ap4A) and the pattern of ecto-nucleotidase activity expression in glaucomatous retinas during the progress the pathology. Ap4A levels were analyzed by HPLC in glaucomatous retinas from the DBA/2J mice at 3, 9, 15, and 23 months of age. For that, retinas...

  2. A Random Dot Computer Video Game Improves Stereopsis

    Portela Camino, Juan A; Martín González, Santiago; Ruiz Alcocer, Javier; Illarramendi Mendicute, Igor; Garrido Mercado, Rafaela
    SIGNIFICANCE: Currently, treatments for amblyopia are occlusion or penalization of the stronger fellow eye. Fewer than 30% of patients improve stereoacuity using these treatments. In order to improve these outcomes, this group proposes a treatment to stimulate the stereoacuity through perceptual learning in a game format for use at home. PURPOSE: The aim of this study was to determine whether perceptual learning with random dot stimuli (RDS) in the form of a computer video game improves stereopsis in patients with a history of amblyopia. METHODS: Thirty-two stereo-deficient patients (7 to 14 years old) previously treated for amblyopia participated in a prospective, randomized,...

  3. Posterior cornea and thickness changes after scleral lens wear in keratoconus patients

    Serramito Blanco, María; Carpena Torres, Carlos; Carballo Álvarez, Jesús; Piñero, David Pablo; Lipson, Michael; Carracedo Rodríguez, Juan Gonzalo
    Purpose: To evaluate the changes in the corneal thickness, anterior chamber depth and posterior corneal curvature and aberrations after scleral lens wear in keratoconus patients with and without intrastromal corneal ring segments (ICRS). Methods:Twenty-six keratoconus subjects (36.95 ± 8.95 years) were evaluated after 8 h of scleral lens wear. The subjects were divided into two groups: those with ICRS (ICRS group) and without ICRS (KC group). The study variables evaluated before and immediately after scleral lens wear included corneal thickness evaluated in different quadrants, posterior corneal curvature at 2, 4, 6 and 8 mm of corneal diameter, posterior corneal aberrations for 4, 6 and 8 mm...

  4. Euthanasia and complacency in bioethics: an approach based on suicide

    Serrano Ruiz-Calderón, José Miguel
    Advocates o euthanasia advocate the "right to die with dignity and recently with the pressures of life in society claim "the duty to die". This article tries to analyze the link between euthanasia and suicide.

  5. Light pollution offshore: Zenithal sky glow measurements in the mediterranean coastal waters

    Ges, Xavier; Bara, Salvador; García Gil, Manuel; Zamorano Calvo, Jaime; Ribas, Salvador J.; Masana, Eduard
    Light pollution is a worldwide phenomenon whose consequences for the natural environment and the human health are being intensively studied nowadays. Most published studies address issues related to light pollution inland. Coastal waters, however, are spaces of high environmental interest, due to their biodiversity richness and their economical significance. The elevated population density in coastal regions is accompanied by correspondingly large emissions of artificial light at night, whose role as an environmental stressor is increasingly being recognized. Characterizing the light pollution levels in coastal waters is a necessary step for protecting these areas. At the same time, the marine surface...

  6. A spectroscopic survey of the youngest field stars in the solar neighborhood II. The optically faint sample

    Frasca, A.; Guillout, P.; Klutsch, A.; Freire Ferrero, R.; Marilli, E.; Biazzo, K.; Gandolfi, D.; Montes Gutiérrez, David
    Context. Star formation in the solar neighborhood is mainly traced by young stars in open clusters, associations, and in the field, which can be identified, for example, by their X-ray emission. The determination of stellar parameters for the optical counterparts of X-ray sources is crucial for a full characterization of these stars. Aims. This work extends the spectroscopic study of the RasTyc sample, obtained by the cross-correlation of the Tycho and ROSAT All-Sky Survey catalogs, to stars fainter than V = 9.5 mag and aims to identify sparse populations of young stars in the solar neighborhood. Methods. We acquired 625...

  7. Proyecto Kilisun

    Calvo Walling, Miguel Ángel; Zaballa Larumbe, Onintze
    Kilisun Care surge en Tanzania con el objetivo de solventar, por un lado, la discriminación a la que las personas con albinismo están sometidas cada día y, por otro lado, la carencia de educación en los hábitos de sus cuidados para así reducir los casos de cáncer de piel. Tras realizar un análisis de la realidad del proyecto se decide analizar el efecto de variables demográficas sobre el beneficio de continuar en el proyecto Kilisun; evaluar el tiempo entre visitas de los pacientes desde el comienzo del proyecto; y establecer una plataforma electrónica de recogida y gestión de datos. Métodos: Estudio prospectivo...

  8. Procesos de validación del informe de resultados estadísticos en ensayos clínicos

    Romero Ferreiro, María del Carmen
    Los ensayos clínicos tienen un alto impacto en la práctica clínica y son esenciales para el avance de la ciencia. En base a los resultados obtenidos en ensayos clínicos se toman una serie de decisiones importantes sobre la salud de los futuros pacientes, por lo que es fundamental que el diseño, análisis y presentación de los datos se realice de la forma más exacta posible. Debido a estas razones, la contribución del bioestadístico es esencial en el desarrollo y realización de un ensayo clínico. SCReN, plataforma española de apoyo a los ensayos clínicos multicéntricos, realiza un gran esfuerzo por unificar...

  9. Implicaciones del Brexit sobre los derechos de propiedad industrial e intelectual: estado de la cuestión

    De Miguel Asensio, Pedro Alberto
    Los términos de la separación del Reino Unido de la Unión Europea en lo relativo a la protección de los derechos de propiedad industrial e intelectual han sido en buena medida ya acordados en el marco del Borrador de Acuerdo de Retirada. Particular atención merecen las previsiones relativas a los derechos unitarios, como las marcas de la Unión y los diseños comunitarios, así como lo relativo al agotamiento de derechos. Al margen del Acuerdo, también ha habido novedades acerca de las perspectivas en relación con el registro de nombres de dominio bajo “.eu”. Además, la ratificación por el Reino Unido...

  10. Conservación de una obra deteriorada por roedores:(BH FLL 20704)

    Katati Bote, Sara
    En las páginas siguientes se detalla el tratamiento llevado a cabo sobre la obra,la cual presenta un deterioro significativo por la actividad de roedores. El hecho de que la Biblioteca cuente con otro ejemplar de la misma edición llevó a la determinación de conservar el deterioro, quedando el libro como ejemplo de este tipo concreto de alteraciones. El trabajo fue realizado por la autora, alumna de la Escuela Superior de Conservación y Restauración de Bienes Culturales de Madrid (ESCRBC), en el contexto de la “Campaña de verano 2018”, en la que estudiantes de la ESCRBC realizan prácticas en la Biblioteca...

  11. Experimental and theoretical electron-scattering cross- section data for dichloromethane

    Krupa, K.; Lange, E.; Blanco Ramos, Francisco; Barbosa, A. S.; Pastega,, D. F.; Sanchez, S. d’A.; Bettega, M. H. F.; García Jurado, G.
    We report on a combination of experimental and theoretical investigations into the elastic differential cross sections (DCSs) and integral cross sections for electron interactions with dichloromethane, CH₂Cl₂, in the incident electron energy over the 7.0-30 eV range. Elastic electron-scattering cross-section calculations have been performed within the framework of the Schwinger multichannel method implemented with pseudopotentials (SMCPP), and the independent-atom model with screening-corrected additivity rule including interference-effects correction (IAM-SCAR+I). The present elastic DCSs have been found to agree reasonably well with the results of IAM-SCAR+I calculations above 20 eV and also with the SMC calculations below 30 eV. Although some discrepancies...

  12. Total cross sections for electron scattering by 1-propanol at impact energies in the range 40-500 eV

    Silva, D. G. M. da; Gomes, M.; Ghosh, S.; Silva, I. F. L.; Pires, W. A. D.; Jones,, D. B.; Blanco Ramos, Francisco; Garcia, C.; Buckman, S. J.; Brunger, M. J.; Lopes, C. A.
    Absolute total cross section (TCS) measurements for electron scattering from 1-propanol molecules are reported for impact energies from 40 to 500 eV. These measurements were obtained using a new apparatus developed at Juiz de Fora Federal University-Brazil, which is based on the measurement of the attenuation of a collimated electron beam through a gas cell containing the molecules to be studied at a given pressure. Besides these experimental measurements, we have also calculated TCS using the Independent-Atom Model with Screening Corrected Additivity Rule and Interference (IAM-SCAR+I) approach with the level of agreement between them being typically found to be very...

  13. Family and community support among older Chilean adults: the importance of heterogeneous social support sources for quality of life

    Gallardo-Peralta, Lorena; Barrón López-López de Roda, Ana
    Family and community social networks act as social resources that promote well-being at advanced ages. In this study, we analyze the association between social support received from personal social networks (social support from various family members and friends) and community social networks (social support from neighbors and the neighborhood, age, ethnic, or religious group peers and formal social support networks) and quality of life (QoL) for a sample of older Chilean persons (n = 777). The results confirm that social support from family (partner, children, and extended family) and friends, integration in the community (neighbors) and social support from informal...

  14. Google es noticia. Transformación de los marcos informativos sobre Google en la prensa española

    García Romero, Enrique; Ruiz San Román, José A.; Serrano Oceja, José Francisco
    Fundada en 1998, en menos de veinte años, Google se ha convertido en una de las mayores multinacionales del mundo. Esta investigación estudia las informaciones periodísticas sobre Google, desde la perspectiva de la teoría del encuadre (framing). La pregunta propuesta es: ¿Ha cambiado la imagen que la prensa española proyecta sobre Google desde los inicios de la compañía a los últimos años? Para responder, se ha hecho un análisis de contenido de todos los textos periodísticos sobre Google publicados en 2004 y 2014 por “El País”, “El Mundo”, “ABC” y “La Vanguardia”. Mediante un protocolo de análisis, se han detectado...

  15. The CARMENES search for exoplanets around M dwarfs High-resolution optical and near-infrared spectroscopy of 324 survey stars

    Cortés Contreras, Miriam; Montes Gutiérrez, David; otros, ...
    The CARMENES radial velocity (RV) survey is observing 324 M dwarfs to search for any orbiting planets. In this paper, we present the survey sample by publishing one CARMENES spectrum for each M dwarf. These spectra cover the wavelength range 520-1710 nm at a resolution of at least R > 80 000, and we measure its RV, Ha emission, and projected rotation velocity. We present an atlas of high-resolution M-dwarf spectra and compare the spectra to atmospheric models. To quantify the RV precision that can be achieved in low-mass stars over the CARMENES wavelength range, we analyze our empirical information...

  16. Probing the Diffuse Optical-IR Background with TeV Blazars Detected with the MAGIC Telescopes

    Prandini, Elisa; Domínguez Díaz, Alberto; Ramazani, Vandad Fallah; Hassan, Tarek; Mazin, Daniel; Moralejo, Abelardo; Nievas Rosillo, Mireia; Vanzo, Gaia; Vazquez Acosta, Monica
    Blazars are radio loud quasars whose jet points toward the observer. The observed emission is mostly non-thermal, dominated by the jet emission, and in some cases extends up to the very high energy gamma rays (VHE; E > 100 GeV). To date, more than 60 blazars have been detected at VHE mainly with ground-based imaging atmospheric Cherenkov telescopes (IACTs) such as MAGIC, H.E.S.S., and VERITAS. Energetic photons from a blazar may interact with the diffuse optical and IR background (the extragalactic background light, EBL) leaving an imprint on the blazar energy spectrum. This effect can be used to constrain the...

  17. Comparison of electromagnetic and nuclear dissociation of ¹⁷Ne

    Fraile Prieto, Luis Mario; otros, ...
    The Borromean drip-line nucleus ¹⁷Ne has been suggested to possess a two-proton halo structure in its ground state. In the astrophysical rp-process, where the two-proton capture reaction ¹⁵O(2p,γ) ¹⁷Ne plays an important role, the calculated reaction rate differs by several orders of magnitude between different theoretical approaches. To add to the understanding of the ¹⁷Ne structure we have studied nuclear and electromagnetic dissociation. A 500 MeV/u¹⁷Ne beam was directed toward lead, carbon, and polyethylene targets. Oxygen isotopes in the final state were measured in coincidence with one or two protons. Different reaction branches in the dissociation of ¹⁷Ne were disentangled....

  18. Strong neutron pairing in core+4n nuclei

    Fraile Prieto, Luis Mario; otros, ...
    The emission of neutron pairs from the neutron-rich N = 12 isotones ¹⁸C and ²⁰O has been studied by high-energy nucleon knockout from ¹⁹N and ²¹O secondary beams, populating unbound states of the two isotones up to 15 MeV above their two-neutron emission thresholds. The analysis of triple fragment-n-n correlations shows that the decay ¹⁹N (-1p)¹⁸C* → ¹⁶C + n + n is clearly dominated by direct pair emission. The two- neutron correlation strength, the largest ever observed, suggests the predominance of a ¹⁴C core surrounded by four valence neutrons arranged in strongly correlated pairs. On the other hand, a...

  19. Total absorption spectroscopy of fission fragments relevant for reactor antineutrino spectra

    Fraile Prieto, Luis Mario; Vedia Fernández, María Victoria; ..., otros
    The accurate determination of reactor antineutrino spectra remains a very active research topic for which new methods of study have emerged in recent years. Indeed, following the long-recognized reactor anomaly (measured antineutrino deficit in short baseline reactor experiments when compared with spectral predictions), the three international reactor neutrino experiments Double Chooz, Daya Bay and Reno have recently demonstrated the existence of spectral distortions in their measurements with respect to the same predictions. These spectral predictions were obtained through the conversion of integral beta-energy spectra obtained at the ILL research reactor. Several studies have shown that the underlying nuclear physics required...

  20. TAGS measurements of ¹⁰⁰Nb ground and isomeric states and 140¹⁴⁰Cs for neutrino physics with the new DTAS detector

    Fraile Prieto, Luis Mario; Vedia Fernández, María Victoria
    In this work we report on total absorption γ-ray spectroscopy measurements of the β decay of fission products that are important contributors to the antineutrino spectrum. The experiment was performed at IGISOL as a part of a campaign of measurements with the new DTAS spectrometer. Preliminary results of the analysis of the β decay of ¹⁰⁰Nb, ¹⁰⁰Nb and ¹⁴⁰Cs are presented.

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