Recursos de colección

E-Prints Complutense (104.951 recursos)

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

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Mostrando recursos 1 - 20 de 2.728

  1. First report of a Middle-Upper Permian magmatism in the SE Iberian Ranges: characterisation and comparison with coeval magmatisms in the western Tethys

    Lago San José, Marceliano; Horra del Barco, Raúl de la; Ubide Garralda, Teresa; Galé, Carlos; Galán Abellán, Ana Belén; Fernández Barrenechea, José María; López Gómez, José; Benito Moreno, Isabel María; Arche, Alfredo; Alonso Azcárate, Alonso; Luque del Villar, Francisco Javier; Timmerman, M.J.
    A multiple basic to intermediate sill is reported for the first time in the south-eastern Iberian Ranges. It is composed of several tabular to irregular levels intercalated within the fluvial sediments of the Alcotas Formation (Middle-Upper Permian). The sill could represent the youngest Paleozoic subvolcanic intrusion in the Iberian Ranges.The igneous rocks are classified as basaltic andesites.They show a subophitic microstructure constituted by plagioclase (An62 – An6), augite (εn48Wo44Fs7 –εn46Wo39Fs15), pseudomorphosed olivine, minor amounts of oxides (magnetite and ilmenite) and accessory F-apatite. According to the mineralogy and whole-rock composition, their geochemical affinity is transitional from subalkaline to alkaline. Radiometric dating...

  2. New ichnites from the Middle Triassic of the Iberian Ranges (Spain): paleoenvironmental and paleogeographical implications

    Ganda, Georges; Horra del Barco, Raúl de la; Galán-Abellán, Belén; López Gómez, José; Fernández Barrenechea, José María; Arche, Alfredo; Benito Moreno, Isabel María

  3. Análisis de la presencia de las multilatinas en el espacio económico del grupo de Visegrád

    Nedela, Daniel
    Este trabajo pretende ampliar la todavía escasa literatura referida a las multinacionales procedentes de América Latina. Los trabajos existentes se centran en el proceso de la multinacionalización de las empresas origen latinoamericano y en la evolución histórica que ha permitido su surgimiento y su configuración como referencias a nivel mundial en sus respectivos sectores. El trabajo analiza cómo dentro del espacio europeo, las multilatinas han validado su proceso de internacionalización con destino al espacio de la Europa Central; en concreto en los países del Grupo de Visegrád.

  4. La crisis del euro. Una reflexión sobre las políticas de austeridad y el diseño institucional de la Unión Económica y Monetaria Europea

    Oyarzun de la Iglesia, Francisco Javier
    La crisis del euro se ha analizado con profusión desde que, con el rescate a Grecia a principios de 2010, la Unión Económica y Monetaria (UEM) europea impuso unas políticas de austeridad muy severas a un conjunto de países periféricos. La singularidad de la respuesta de la UEM a la crisis se ha debido en buena parte a su diseño institucional y a la relación de fuerzas que han operado en la misma desde su nacimiento en 1992 y su puesta en marcha en el año 2000. En este artículo se analizan las causas de la adopción de esta política...

  5. Modelos VaR para calcular el capital mínimo regulatorio por riesgo de mercado

    Stupariu, Patricia; Ruiz, Juan Rafael; Vilariño, Ángel
    La revisión de la regulación del riesgo de mercado de Basilea III contempla reemplazar los modelos VaR con una nueva métrica para el cómputo de los requerimientos mínimos de capital. En este trabajo se calcularán los requerimientos de capital por riesgo de mercado para una cartera de acciones del índice S&P500, entre el periodo 2000-2014 en base a la metodología RiskMetrics y alternativamente con modelos GARCH(1,1). Los resultados obtenidos muestran que el capital regulatorio calculado en base a las normas de Basilea II cubre en todo momento las pérdidas de la cartera.

  6. Pros and cons of the impact factor in a rapidly changing digital world

    McAleer, Michael; Oláh, Judit; Popp, József
    The purpose of the paper is to present arguments for and against the use of the Impact Factor (IF) in a rapidly changing digital world. The paper discusses the calculation of IF, as well as the pros and cons of IF. Editorial policies that affect IF are examined, and the merits of open access online publishing are presented. Scientific quality and the IF dilemma are analysed, and alternative measures of impact and quality are evaluated. The San Francisco declaration on research assessment is also discussed.

  7. Roadsides: an opportunity for biodiversity conservation

    Arenas Escribano, Juan María; Escudero Alcántara, Adrián; Mola, Ignacio; Casado González, Miguel Ángel
    Questions: How do roadsides interact with patches of natural vegetation in shaping perennial plant communities in fragmented agricultural areas? Are the observed differences due to the type of roadside (i.e. roadcuts, embankments or road verges) or are there other factors driving community structure and composition? Location: Stretch of motorway A3 and its surrounding area, central Spain. Methods: We analysed the variation in perennial plant species composition and diversity among 92 plots (400 m2 ). The plots were located in five different environmental scenarios, three of them in a fragmented landscape (patches of natural vegetation, embankments and roadcuts) and two in an...

  8. The biodiversity impacts of non-native species should not be extrapolated from biased single-species studies

    Guering, Greg R.; Martín-Forés, Irene; Sparrow, Ben; Lowe, Andrew J.
    The presence, diversity and abundance of non-native plant species in natural vegetation are common condition indicators used to determine conservation status, with consequences for management strategies and investment. The rationale behind non-native species metrics as condition indicators is the assumption that non-natives have negative consequences on native biodiversity and habitat condition. The case against non-native species is not so clear-cut, with some studies reporting neutral or even facilitative interactions, often depending on spatial scale. Observational and experimental evaluations of the impact of particular non-native species on biodiversity provide a vital evidence-base for general conservation management strategies. Unintentionally though, many studies...

  9. Myth and Origins: Men Want to Know

    Losada Goya, José Manuel
    Starting with a personal definition of “myth”, this paper seeks to substantiate the claim that every myth is essentially etiological, in the sense that myths somehow express a cosmogony or an eschatology, whether particular or universal. In order to do that, this study reassesses Classical and Judeo-Christian mythologies to revisit and contrast the narratives of origin—of the cosmos, of the gods and of men—found in ancient polytheism and in Judeo-Christian monotheism. Taking into consideration how these general and particular cosmogonies convey a specific understanding of the passage of time, this article does not merely recount the cosmogonies, theogonies, and anthropogonies...

  10. Los ejemplares tipo y figurados de las colecciones paleontológicas del Museo Geominero. I. Invertebrados e icnofósiles paleozoicos

    Rábano, Isabel; Arribas, A.
    Entre la colección de invertebrados e icnofósiles paleozoicos del Museo Geominero se ha detectado la presencia de 501 ejemplares figurados, de los que 135 son ejemplares tipo. Todos ellos son fósiles españoles, a excepción de 28 procedentes de Marruecos y del Sáhara Occidental. Los datos obtenidos se han almacenado en una base de datos temática, que permite un fácil acceso y consulta de la información. El estudio de estas colecciones forma parte de un proyecto más amplio, en el que se contempla también la investigación de los fósiles e icnofósiles mesozoicos y cenozoicos, que supondrá la revalorización científica y patrimonial...

  11. Nanostructures for imaging, medical diagnostics and therapy

    Paris, J.L.; Vallet Regí, María

  12. Patrimonio audiovisual iberoamericano Online (1982-2017): España, Argentina, Bolivia, Brasil, Colombia, Costa Rica, Cuba, Chile, Ecuador,El Salvador, Guatemala, México, Paraguay, Perú, Uruguay, Venezuela.

    López Yepes, Alfonso
    Realizaciones del Servicio de Documentación Multimedia, adscrito al Dpto.Biblioteconomía y Documentación de la Universidad Complutense, a través de blogs, portales y canales de producción propia, con acceso a contenidos complementarios generados con herramientas o instrumentos de producción, recuperación y difusión informativa de otras instituciones especializadas. Metodología de la investigación científica, documentación informativa-gestión de información cinematográfica, periodística, publicitaria, radiofónica, televisiva, en redes sociales. Archivos, bibliotecas, centros y servicios de documentación, ámbitos audiovisuales universitarios, medios de comunicación especializados.Reúne 18 aportaciones: diez estudios monográficos multimedia, un proyecto de investigación, tres seminarios, un programa radiofónico, una ponencia a congreso, un webinar o seminario en...

  13. Early exposure to Batrachochytrium dendrobatidis causes profound immunosuppression in amphibians

    Fernández-Loras, Andrés; Fernández-Beaskoetxea, Saioa; Arriero Higueras, Elena; Fisher, Matthew C.; Bosch, Jaime
    Fungal pathogens have evolved a broad suite of strategies aiming at evading the host immune response. Amphibians are globally infected by the panzootic chytrid fungus Batrachochytrium dendrobatidis (Bd) and, while robust innate immune defences have been characterised, there is little evidence for the existence of effective adaptive immunity. We determine the immune response of the common midwife toad following challenge by Bd as larvae. Immune function was described for both the cell-mediated and antibody-mediated immune responses following infectious challenge as larval amphibians. While there were no significant differences in the ratio of neutrophils/lymphocytes between infected and uninfected individuals, early exposure...

  14. Mesoporous Silica Nanoparticles Functionalized with Hyaluronic Acid. Effect of the Biopolymer Chain Length on Cell Internalization

    Nairi, Valentina; Magnolia, Silvia; Piludu, Marco; Nieddu, Mariella; Caria, Cristian Antonio; Sogos, Valeria; Vallet Regí, María; Monduzzi, Maura; Salis, Andrea
    Mesoporous silica nanoparticles (MSNs) were functionalized with amino groups (MSN-NH2) and then with hyaluronic acid, a biocompatible biopolymer which can be recognized by CD44 receptors in tumor cells, to obtain a targeting drug delivery system. To this purpose, three hyaluronic acid samples differing for the molecular weight, namely HAS (8 -15 kDa), HAM (30-50 kDa) and HAL (90-130 kDa), were used. The MSN-HAS, MSN-HAM, and MSN-HAL materials were characterized through zeta potential and dynamic light scattering measurements at pH=7.4 and T=37°C to simulate physiological conditions. While zeta potential showed an increasing negative value with the increase of the HA chain...

  15. Innovación en Servicios en la UE: Una Aproximación a la Densidad de Innovación y la Importancia Económica de los Innovadores a partir de los Datos Agregados de la CIS3

    García Sánchez, Antonio; Molero Zayas, José
    The aim of this paper is to analyse the behaviour of different service sectors in the EU with regard to innovation. Because of the non availability of micro data, we have used sectoral data in an aggregated analysis. The variables which have a higher explanatory power are the sector of activity and the country of origin. To carry out non R&D innovatory activities seems to encourage innovation, albeit the adoption of strategic actions or inner improvements does not show any positive influence. It must be underlined that many other innovatory actions such as cooperation or R&D do not show a...

  16. Inbreeding in Southeastern Spain:The impact of geography and demography on marital mobility and marital distance patterns (1900–1969)

    Calderón Fernández, Rosario; Hernández de la Fuente, Candela Lucía; García-Varela, G.; Masciarelli, D.; Cuesta, P.
    In this paper, the structure of a southeastern Spanish population was studied for the first time with respect to its inbreeding patterns and its relationship with demographic and geographic factors. Data on consanguineous marriages (up to second cousins) from 1900 to 1969 were taken from ecclesiastic dispensations. Our results confirm that the patterns and trends of inbreeding in the study area are consistent with those previously observed in most non-Cantabrian Spanish populations. The rate of consanguineous marriages was apparently stable between 1900 and 1935 and then sharply decreased since 1940, which coincides with industrialization in Spain. A marked departure from...

  17. Polarimetry with azimuthally polarized light

    Gonzalez de Sande, Juan Carlos; Piquero Sanz, Gemma María; Santarsiero, Massimo
    Nonuniformly polarized light can be used for Mueller polarimetry of homogeneous linear samples. In this work, a set up based on using azimuthally polarized input light and a modified commercial light polarimeter is proposed and developed. With this set up, a Mueller submatrix of a sample can be obtained by measuring the Stokes parameters at only three different positions across the output beam section. Symmetry constraints for linear deterministic samples allow the complete Mueller matrix to be deduced for this kind of specimens. The experimental results obtained for phase plates and for a linear polarizer confirm the validity of the...

  18. Mesoporous Silica Nanoparticles Decorated with Polycationic Dendrimers for Infection Treatment

    González Ortiz, Blanca; Colilla, Montserrat; Díez, Jaime; Pedraza, Daniel; Guembe, Marta; Izquierdo-Barba, Isabel; Vallet Regí, María
    This work aims to provide an effective and novel solution for the treatment of infection by using nanovehicles loaded with antibiotics capable of penetrating the bacterial wall, thus increasing the antimicrobial effectiveness. These nanosystems, named "nanoantibiotics", are composed of mesoporous silica nanoparticles (MSNs), which act as nanocarriers of an antimicrobial agent (levofloxacin, LEVO) localized inside the mesopores. To provide the nanosystem of bacterial membrane interaction capability, a polycationic dendrimer, concretely the poly(propyleneimine) dendrimer of third generation (G3), was covalently grafted to the external surface of the LEVOloaded MSNs. After physicochemical characterization of this nanoantibiotic, the release kinetics of LEVO and...

  19. Ultrasound-Mediated Cavitation-Enhanced Extravasation of Mesoporous Silica Nanoparticles for Controlled-Release Drug Delivery

    Paris, J.L.; Mannaris, Christophoros; Cabañas Criado, Victoria; Carlisle, Robert; Manzano García, Miguel; Vallet Regí, María; Coussios, Constantin C.
    Mesoporous silica nanoparticles have been reported as suitable drug carriers, but their successful delivery to target tissues following systemic administration remains a challenge. In the present work, ultrasound-induced inertial cavitation was evaluated as a mechanism to promote their extravasation in a flow-through tissue mimicking agarose phantom. Two different ultrasound frequencies, 0.5 or 1.6 MHz, with pressures in the range 0.5-4 MPa were used to drive cavitation activity which was detected in real time. The optimal ultrasound conditions identified were employed to deliver dye-loaded nanoparticles as a model for drug-loaded nanocarriers, with the level of extravasation evaluated by fluorescence microscopy. The...

  20. Self-immolative chemistry in nanomedicine

    Gisbert Garzarán, Miguel; Manzano García, Miguel; Vallet Regí, María
    Self-immolative chemistry is based on the cascade of disassembling reactions triggered by the adequate stimulation and leading to the sequential release of the smaller constituent elements. This review will focus on the possibilities that this type of chemistry offers to nanomedicine research, which is an area where the stimuli responsive behavior is always targeted. There are some examples on the use of self-immolative chemistry for prodrugs or nanoparticles for drug delivery, but there is still an exciting land of opportunities waiting to be explored. This review aims at revising what has been done so far, but, most importantly, it aims...

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