Recursos de colección

E-Prints Complutense (101.533 recursos)

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

Tipo = Artículo

Mostrando recursos 1 - 20 de 960

  1. Müller glia reactivity follows retinal injury despite the absence of the glial fibrillary acidic protein gene in Xenopus

    Martínez De-Luna, Reyna I.; Ku, Ray Y.; Aruck, Alexandria M.; Santiago, Francesca; Viczian, Andrea S.; San Mauro, Diego; Zuber, Michael E.
    Intermediate filament proteins are structural components of the cellular cytoskeleton with cell-type specific expression and function. Glial fibrillary acidic protein (GFAP) is a type III intermediate filament protein and is up-regulated in glia of the nervous system in response to injury and during neurodegenerative diseases. In the retina, GFAP levels are dramatically increased in Müller glia and are thought to play a role in the extensive structural changes resulting in Müller cell hypertrophy and glial scar formation. In spite of similar changes to the morphology of Xenopus Müller cells following injury, we found that Xenopus lack a gfap gene. Other...

  2. New Insights on Peniche Basin (West Iberian Margin) Crustal Structure Based on Gravity Data Interpretation

    Sanchez de la Muela, Almudena; Gascone, L.; Muñoz Martín, Alfonso; Mantilla Pimiento, A.; Arnáiz, A.
    A gravimetric study has been carried out over a sector of the West Iberian Margin (WIM), constrained by well and seismic data. The analytic development was made through three main stages: the processing of different gravity datasets, the production of gravity anomaly maps and 2,5D models using the processed data, and the geophysical interpretation of maps and models. The final results of the interpretation achieved, allowed the determination of crustal structure and its variation/complexity along the WIM. The main obtained results concern the pre-saline infilling and the deep structure of the margin, which vary related to the location of first-order...

  3. Vein graphite deposits: geological settings, origin, and economic significance

    Luque del Villar, Francisco Javier; Huizenga, Jan-Marten; Crespo Feo, Elena; Wada, Hideki; Ortega Menor, Lorena; Barrenechea, Edurne
    Graphite deposits result from the metamorphism of sedimentary rocks rich in carbonaceous matter or from precipitation from carbon-bearing fluids (or melts). The latter process forms vein deposits which are structurally controlled and usually occur in granulites or igneous rocks. The origin of carbon, the mechanisms of transport, and the factors controlling graphite deposition are discussed in relation to their geological settings. Carbon in granulite-hosted graphite veins derives from sublithospheric sources or from decarbonation reactions of carbonate-bearing lithologies, and it is transported mainly in CO2-rich fluids from which it can precipitate. Graphite precipitation can occur by cooling, water removal by retrograde...

  4. Vein graphite deposits: geological settings, origin, and economic significance

    Luque del Villar, Francisco Javier; Huizenga, Jan-Marten; Crespo Feo, Elena; Wada, Hideki; Ortega Menor, Lorena; Barrenechea, Edurne
    Graphite deposits result from the metamorphism of sedimentary rocks rich in carbonaceous matter or from precipitation from carbon-bearing fluids (or melts). The latter process forms vein deposits which are structurally controlled and usually occur in granulites or igneous rocks. The origin of carbon, the mechanisms of transport, and the factors controlling graphite deposition are discussed in relation to their geological settings. Carbon in granulite-hosted graphite veins derives from sublithospheric sources or from decarbonation reactions of carbonate-bearing lithologies, and it is transported mainly in CO2-rich fluids from which it can precipitate. Graphite precipitation can occur by cooling, water removal by retrograde...

  5. Plasmonic sensor based on tapered optical fibers and magnetic fluids for measuring magnetic fields

    Rodriguez Schwendtner, E.; Díaz Herrera, Natalia; Navarrete Fernández, María Cruz; González Cano, Agustín; Esteban Martínez, Óscar
    We present a new sensor based on the combination of Surface Plasmon Resonance (SPR) with magneto-refractive materials. We use doubly-deposited uniform-waist tapered optical fibers (DLUWTs), that have shown their good performance and versatility as refractometers, and magnetic fluids as transducers to measure magnetic fields in an all-optical-fiber configuration. We experimentally show the feasibility of our approach, by demonstrating the physical principle of the device and characterizing the performance of the sensors, which show very good sensitivity and resolution. In this way, we propose a new field of development for SPR optical fiber sensors to extend the field of application of...

  6. Optical design teaching by computing graphic methods

    Vázquez Moliní, Daniel; Muñoz de Luna Clemente, Javier; Álvarez Fernández-Balbuena, Antonio; García Botella, Ángel; Belloni, Paola; Alda, Javier
    One of the key challenges in the teaching of Optics is that students need to know not only the math of the optical design, but also, and more important, to grasp and understand the optics in a three-dimensional space. Having a clear image of the problem to solve is the first step in order to begin to solve that problem. Therefore to achieve that the students not only must know the equation of refraction law but they have also to understand how the main parameters of this law are interacting among them. This should be a major goal in the...

  7. Optical design teaching by computing graphic methods

    Vázquez Moliní, Daniel; Muñoz de Luna Clemente, Javier; Álvarez Fernández-Balbuena, Antonio; García Botella, Ángel; Belloni, Paola; Alda, Javier
    One of the key challenges in the teaching of Optics is that students need to know not only the math of the optical design, but also, and more important, to grasp and understand the optics in a three-dimensional space. Having a clear image of the problem to solve is the first step in order to begin to solve that problem. Therefore to achieve that the students not only must know the equation of refraction law but they have also to understand how the main parameters of this law are interacting among them. This should be a major goal in the...

  8. Mathematical Model Applied To Improve The Natural Lighting Design

    García Fernández, Berta; Vázquez Moliní, Daniel; Álvarez Fernández-Balbuena, Antonio
    Daylighting must be considered as the greenest way to illuminate any space and one of the most important architectural design challenges and opportunities. Human life is strongly influenced by natural lighting, and nowadays we have to add to this factor the importance of energy conservation and pollution reduction objectives. The development of hollow light guides offers people the advantages of natural lighting and the benefits of reduced energy consumption systems, providing changes in architectural form of spaces where sunlight does not have direct access. Hollow Cylindrical Prismatic Light Guides (CPLGs) are transparent optical components able to transmit high diameter light...

  9. Mathematical Model Applied To Improve The Natural Lighting Design

    García Fernández, Berta; Vázquez Moliní, Daniel; Álvarez Fernández-Balbuena, Antonio
    Daylighting must be considered as the greenest way to illuminate any space and one of the most important architectural design challenges and opportunities. Human life is strongly influenced by natural lighting, and nowadays we have to add to this factor the importance of energy conservation and pollution reduction objectives. The development of hollow light guides offers people the advantages of natural lighting and the benefits of reduced energy consumption systems, providing changes in architectural form of spaces where sunlight does not have direct access. Hollow Cylindrical Prismatic Light Guides (CPLGs) are transparent optical components able to transmit high diameter light...

  10. Short term visual outcomes of a new trifocal intraocular lens

    García Pérez, Jorge L.; Gros Otero, Juan; Sánchez Ramos, Celia; Blázquez Sánchez, Vanesa; Contreras Martín, Inés
    Background: Today, patients often expect to achieve spectacle independance after cataract surgery. New trifocal intraocular lenses have been developed to try and fullfill this demand. The purpose of this study is to report the short-term visual outcomes of a new trifocal intraocular lens (AcrySof PanOptix™). Methods: Consecutive adult patients undergoing cataract surgery with bilateral implantation of the study intraocular lens in a private practice clinic were considered for inclusion. Exclusion criteria were the presence of other ocular pathologies or preoperative astigmatism >1.5 diopters (D). Patients with intraoperative complications were excluded from analysis. One month after surgery patients underwent: monocular defocus...

  11. Short term visual outcomes of a new trifocal intraocular lens

    García Pérez, Jorge L.; Gros Otero, Juan; Sánchez Ramos, Celia; Blázquez Sánchez, Vanesa; Contreras Martín, Inés
    Background: Today, patients often expect to achieve spectacle independance after cataract surgery. New trifocal intraocular lenses have been developed to try and fullfill this demand. The purpose of this study is to report the short-term visual outcomes of a new trifocal intraocular lens (AcrySof PanOptix™). Methods: Consecutive adult patients undergoing cataract surgery with bilateral implantation of the study intraocular lens in a private practice clinic were considered for inclusion. Exclusion criteria were the presence of other ocular pathologies or preoperative astigmatism >1.5 diopters (D). Patients with intraoperative complications were excluded from analysis. One month after surgery patients underwent: monocular defocus...

  12. Utilidad de la pupilometría dinámica en el control de alcoholemia de los conductores

    Lobato Rincón, Luis-Lucio; Cabanillas Campos, María del Carmen; Navarro Valls, Juan José; Bonnin Arias, Cristina; Chamorro Gutiérrez, Eva; Sánchez Ramos, Celia
    La pupilometría se ha convertido en una herramienta de gran interés en las Ciencias de la Visión. Hasta el momento, solo unos pocos estudios han explorado la relación entre el reflejo pupilar y el consumo de drogas. El objetivo de este estudio fue evaluar la aplicabilidad de la pupilometría dinámica mesópica como método objetivo para la detección de niveles de alcoholemia por encima del límite legal. Se utilizó un diseño de carácter cuasi-experimental, con 19 voluntarios participando en dos condiciones (pre y post ingesta de alcohol). En la sesión con alcohol, los participantes consumieron 27.5 ml de alcohol en intervalos...

  13. Utilidad de la pupilometría dinámica en el control de alcoholemia de los conductores

    Lobato Rincón, Luis-Lucio; Cabanillas Campos, María del Carmen; Navarro Valls, Juan José; Bonnin Arias, Cristina; Chamorro Gutiérrez, Eva; Sánchez Ramos, Celia
    La pupilometría se ha convertido en una herramienta de gran interés en las Ciencias de la Visión. Hasta el momento, solo unos pocos estudios han explorado la relación entre el reflejo pupilar y el consumo de drogas. El objetivo de este estudio fue evaluar la aplicabilidad de la pupilometría dinámica mesópica como método objetivo para la detección de niveles de alcoholemia por encima del límite legal. Se utilizó un diseño de carácter cuasi-experimental, con 19 voluntarios participando en dos condiciones (pre y post ingesta de alcohol). En la sesión con alcohol, los participantes consumieron 27.5 ml de alcohol en intervalos...

  14. Long range correlations in DNA: scaling properties and charge transfer efficiency

    Roche, S.; Bicout, D.; Maciá Barber, Enrique Alfonso; Kats, E.
    We address the relation between long-range correlations and charge transfer efficiency in aperiodic artificial or genomic DNA sequences. Coherent charge transfer through the highest occupied molecular orbital states of the guanine nucleotide is studied using the transmission approach, and the focus is on how the sequence-dependent backscattering profile can be inferred from correlations between base pairs.

  15. Erratum: Long range correlations in DNA: scaling properties and charge transfer efficiency (vol 91, art no 228101, 2003)

    Roche, S.; Bicout, D.; Maciá Barber, Enrique Alfonso

  16. Modeling the thermopower of icosahedral Al_(63)Cu_(25)Fe_(12) quasicrystals: spectral fine structure

    Maciá Barber, Enrique Alfonso
    On the basis of a realistic model for the spectral conductivity, obtained from a proper combination of tunneling spectroscopy [R. Escudero , J. Phys.: Condens. Matter 11, 383 (1999)] and transport measurements, we derive a closed analytical expression for the Seebeck coefficient, satisfactorily describing its temperature dependence over a wide temperature range. The relative importance of thermal broadening effects and the temperature dependence of chemical potential in the thermopower curve is quantitatively discussed. By comparing the obtained analytical results with the experimental S(T) curve evidence for band structure effects in the thermopower is reported.

  17. Thermoelectric figure of merit of AlPdRe icosahedral quasicrystals: composition-dependent effects

    Maciá Barber, Enrique Alfonso
    In this work we present a theoretical study on the composition dependence of the thermoelectric figure of merit (ZT) of icosahedral AlPdRe quasicrystals. From our study we conclude that band-structure effects play a significant role in determining the thermoelectric performance of these alloys. By comparing our analytical results with available experimental data of transport coefficients we discuss the most appropriate stoichiometries for thermoelectric applications, concluding that (i) those samples whose Fermi level is located at the pseudogap's minimum exhibit very small ZT values, and (ii) relatively large ZT values are expected for those samples exhibiting narrow features in the density...

  18. La construcción cotidiana de la legitimidad del sujeto inmigrante en el contexto español actual

    Pazos, Álvaro; Devillard Desroches, Marie Jose
    Given the marginality of the non-communitarian immigrants in Spain, the limitations of a legal-political approach are considered. The analysis of the immediate daily environments reveals the subjects’ different ways of social and institutional legitimation, which respond to differentiated logics of social reproduction. Three modalities of recurrent benefits in the present vulnerable context are compared: formal organizations, organized networks and interpersonal aids. The ensemble demonstrates the complex intersection between legal and paralegal logics, private and public spaces, the practices of adhesion and the risks of dissafiliation, and between diverse forms and degrees of recognition

  19. La construcción cotidiana de la legitimidad del sujeto inmigrante en el contexto español actual

    Pazos, Álvaro; Devillard Desroches, Marie Jose
    Given the marginality of the non-communitarian immigrants in Spain, the limitations of a legal-political approach are considered. The analysis of the immediate daily environments reveals the subjects’ different ways of social and institutional legitimation, which respond to differentiated logics of social reproduction. Three modalities of recurrent benefits in the present vulnerable context are compared: formal organizations, organized networks and interpersonal aids. The ensemble demonstrates the complex intersection between legal and paralegal logics, private and public spaces, the practices of adhesion and the risks of dissafiliation, and between diverse forms and degrees of recognition

  20. So close but yet so far? Labour Migration Governance in Italy and Spain

    Finotelli, Claudia; Echevarría, Gabriel
    Southern European countries have traditionally been perceived as weak immigration countries with inefficient legal entry avenues for foreign workers, high irregular migration rates and poor integration policies. In recent years, however, the adoption of more efficient control policies, new recruitment strategies and embryonic integration plans throughout the region has led to a change of paradigm in the governance of migration. And yet policy reforms do not seem to have produced the same results everywhere. The aim of this article is to enquire into possible explanations for the divergent paths of labour migration governance in Southern Europe, using Italy and Spain...

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