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showing 9 items of 439 documents
Purification of Nano-Porous Silicon for Biomedical Applications
2011
Recently, various bio-medical applications of nanoporous silicon (np-Si) have been suggested. This work investigates the biocompatibility of np-Si particles taking into account hazardous residua confined in the pores after preparation. The emphasis is on the potential application of such particles as oxygen photosensitizer for photodynamic therapy of cancer, which requires both negligible toxicity of np-Si particles in darkness and a high photo-cyto-toxic effect due to generation of singlet oxygen under illumination. Considerable amounts of water soluble toxic impurities are found to be present in the nanoporous shell of micrometer-sized np-Si particles immediately after their preparation b…
Plasma Functionalization of Multiwalled Carbon Nanotubes and Their Use in the Preparation of Nylon 6-Based Nanohybrids
2012
The possibility to obtain carbon nanotubes (CNT)/polyamide 6 composites with excellent mechanical properties in a simple, industrially scalable way is investigated. Commercial CNTs are treated by plasma while changing some key parameters (exposure time, plasma power, type of gas) in order to optimize the process and to achieve a sufficient degree of functionalization. The treated samples are characterized by Fourier transform infrared spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. The most interesting samples are selected to be used as reinforcing fillers, in different concentrations, in a polyamide 6 matrix. The mechanical tests show a dramatic increase of both tens…
Fabrication techniques for developing a functional microfluidic glass device suitable for detection in optical spectroscopy system
2012
Microfluidic devices offer the chance to manipulate and analyze fluids including bioassays and chemical reactions. In this study, a method to develop a microfluidic analysis system is proposed for detection of nanotubes by a Raman acquisition setup. Microchannels where fabricated in sodalime glass substrate by MeV ion beam lithography or electron beam lithography and wet etching. Fusion bonding (550 °C) was used to seal the microchannels. As a result a prototype microfluidic device with 1.6 µm deep channel that exhibit efficient sealing and suitable channel geometry was obtained. The microfluidic device was tested in a Raman spectroscopy detection system and the collected spectra showed the…
Agenda and media pluralism in Al Rojo Vivo and Las Mañanas de Cuatro
2019
En: Doxa Comunicación: revista interdisciplinar de estudios de comunicación y ciencias sociales. e-ISSN 2386-3978 n. 29, 2019, pp 113-137. Aun con el auge del entorno digital e híbrido, la televisión continúa siendo el principal medio de información en España. Se toma una muestra de 50 programas (25 de “Al Rojo Vivo” y 25 de “Las Mañanas de Cuatro”) para registrar quién participa en ellos, en qué condiciones lo hacen y sobre qué temas se discute. Se aprecia un alto grado de equivalencia en la agenda establecida y una bajísima inclusión de mujeres. El Procés catalán monopolizó la atención. La metodología incluye la cuantificación de los contraargumentos recibidos por los contertulios, mostra…
Diversidad latina y comunicación panhispana en la prensa en español de Nueva York al inicio del siglo XXI
2008
En: Doxa Comunicación : revista interdisciplinar de estudios de comunicación y ciencias sociales. ISSN 1696-019X n. VI, 2008, pp 15-51 Las transformaciones de la prensa hispana en Nueva York en la década del cambio de siglo apuntan la configuración de una incipiente identidad cultural panhispánica. Esa identidad panhispánica se muestra gracias al contenido informativo y publicitario de diversos periódicos en español de esa ciudad, pero sobre todo mediante los tres diarios El Diario-La Prensa, Hoy y Noticias del Mundo. La metodología empleada ha sido un análisis cuantitativo-cualitativo de sus contenidos informativos y publicitarios, con el objetivo de evaluar el carácter de esa prensa, adem…
Development of microfluidics for sorting of carbon nanotubes
2018
Sorting of carbon nanotubes by their chirality is the current bottleneck in the way to their broad employment based on their exceptional electronic and optical properties. Despite the extensive effort, there is no known method, which would result in really pure chirality ensembles. Previously reported sorting protocols result in enrichment rather than in sorting, alter electronic structure, and suffer from low yield. This is mostly due to the statistical approach, where the nanotubes with mixed chiralities are treated as a set. In this thesis, we propose a new sorting technique based on nanotube-by-nanotube compartmelization, characterization, and sorting in a continuously running droplet-b…
Hepatocyte transplantation, a step forward?
2019
Hepatocyte transplantation emerged a few decades ago as a possible strategy to overcome some of the limitations of liver transplantation, among them the availability of organ donors and the functional quality of grafts. Nowadays, allogenic cell transplantation is still to be confirmed as a viable therapeutic option for patients with hereditary metabolic liver diseases. Although we have now overseen 5 decades of basic and animal research in the field, the number of successfully treated patients remains low. Limitations in cell engraftment and selective proliferation of transplanted cells remain a constraint to the generalized use of this therapeutic approach.
Tradurre un mito letterario: tradurre Orazio
2020
Quinto Orazio Flacco è fra i più tradotti auctores latini nelle culture letterarie d’Europa, soprattutto nei secoli XVI, XVII, XVIII. La ricostruzione repertoriale e critica delle traduzioni che hanno avuto per oggetto il suo corpus si offre, quindi, come documento particolarmente significativo della fortuna traduttoria di un mito letterario, in quanto attesta il rapporto di imitatio/aemulatio che numerosi autori hanno stabilito con il modello nel momento in cui hanno deciso di assimilarlo, attraverso le traduzioni, alle lingue e alle culture nazionali cui essi appartengono.
Nonlinearities in plant RNA virus fitness
2012
Una de las mayores amenazas tanto para la salud humana y animal, como para la agronomía es la emergencia de nuevas enfermedades infecciosas, la mayoría de las cuales están causadas por los virus de RNA. La emergencia viral es un problema complejo que consista en la adquisición de la variación genética, por mutación o recombinación, dentro de la población viral en el huésped reservorio la cual podría facilitar la capacidad de infectar de manera eficiente nuevos huéspedes. Los virus de RNA presentan a una evolucionabilidad extraordinaria por sus grandes tamaños poblacionales, cortos tiempos de generación y altas tasas de mutación y recombinación. Comprender los mecanismos evolutivos que podrí…