Low density polyethylene/silica nanocomposite foams. Relationship between chemical composition, particle dispersion, cellular structure and physical properties

Postprint (author's final draft

Actin cytoskeletal organization in human osteoblasts grown on different dental titanium implant surfaces

The understanding of the cellular basis of osteoblastic cell-biomaterial interaction is crucial to the analysis of the mechanism of osseointegration. Cell adhesion is a complex process that is dependent on the cell types and on the surface microtopography and chemistry of the substrate. We have studied the role of microtopography in modulating cell adhesion, in vitro, using a human osteoblastic cell line for the assessment of actin cytoskeletal organization. Through application of CLSM combining reflection and fluorescence, 2D or 3D images of cytoskeleton were obtained. On smooth surfaces, Ti CP machined, predominantly planar bone cells with an axial ratio of 1.1 were randomly oriented, with stress fibers running in all directions, and thin filopodia. On T iCP Osseotite ® surfaces the osteoblastic cells conformed to the irregular terrain of the sustrate with focal adhesion sites only established on the relative topographical peaks separated for a longer distance than in the machined surface, and defined wide lamellopodia and long filopodia, with enhanced expression of stress fibers, forming large clear focal contacts with the rough surface. The cytoskeletal organization of cells cultured on rough titanium supports an active role for the biomaterial surface in the events that govern osteoblastic cell adhesion. The results enforce the role of the rough sustrate surface in affecting osteoblastic cell adhesion and provide valuable information for the design of material surfaces that are required for the development of an appropriate osteogenic surface for osteoblastic anchorage, compared to machined surface, in dental implants

Percepción de materiales: estudio del espacio latente

El objetivo del trabajo es entender como las personas perciben las características físicas de los materiales y diferencian unos de otros. Para lograr este objetivo, se va a analizar el espacio latente generado por una red entrenada a partir de juicios humanos de materiales y el propio comportamiento de la red. El espacio latente generado por una red neuronal puede ser muy complejo y difícil de explorar, no solo por su alta dimensionalidad sino por la posible falta de correlación clara entre distintos grupos de datos de entrada. A lo largo del trabajo, los diferentes análisis parecen apuntar a que el espacio estudiado es más simple de lo que se esperaba, y que tiene organizados los materiales principalmente de acuerdo con la forma en la que reflejan la luz. Finalmente, se ha podido desarrollar un sistema de reconstrucción del espacio latente (generador imágenes de materiales) que permite también la edición de materiales de forma sencilla, sin tener que manipular directamente una imagen.<br /

P-Lingua 2.0: New Features and First Applications

P-Lingua is a programming language for membrane computing. It was rst presented in Edinburgh, during the Ninth Workshop on Membrane Computing (WMC9). In this paper, the models, simulators and formats included in P-Lingua in version 2.0 are explained. We focus on the stochastic model, associated simulators and updated features. Finally, we present two new applications based on P-Lingua 2.0: a tool for describing and simulating ecosystems and a framework (currently under development) for P systems design.Ministerio de Educación y Ciencia TIN2006–13425Junta de Andalucía P08-TIC-0420

Solving the N-Queens Puzzle with P Systems

The N-queens puzzle consists on placing N queens on an N x Ngrid in such way that no two queens are on the same row, column or diagonal line. In this paper we present a family of P systems with active membranes (one P system for each value of N) that provides all the possible solutions to the puzzle.Ministerio de Educación y Ciencia TIN2006-13425Junta de Andalucía P08-TIC-0420

Relación entre demografía y desarrollo en América Latina y el Caribe entre 1960 y 2019

Este trabajo analiza la relación entre el desarrollo económico y la evolución demográfica, utilizando datos de 35 países de América Latina y el Caribe para siete periodos de tiempo entre 1960 y 2019. Iniciamos nuestro trabajo describiendo las variables de estudio y su evolución, para posteriormente realizar el análisis econométrico. Los resultados de nuestros análisis muestran que el PIB per cápita en dólares constantes de 2010, utilizada como variable para medir el desarrollo económico, afecta de forma positiva y significativa a la tasa de fecundidad, variable utilizada para medir la evolución demográfica. Mediante la utilización de diferentes análisis econométricos agrupando los países y el tiempo, encontramos en la mayoría de periodos una relación positiva entre el PIB per cápita y la tasa de fecundidad. Solo en el año 1970 y la crisis de 1980, existe una relación negativa entre ambas variables, indicando que la incertidumbre económica desalienta las decisiones de las familias para tener hijos, al igual que las perspectivas de desarrollo económico en el resto de años las animan a tener un mayor número de hijos. Concluimos el trabajo explicando algunas medidas económicas que pueden llevar a cabo los gobiernos para revertir la constante caída de la tasa de fecundidad. <br /

An Overview of P-Lingua 2.0

P–Lingua is a programming language for membrane computing which aims to be a standard to define P systems. In order to implement this idea, a Java library called pLinguaCore has been developed as a software framework for cell–like P systems. It is able to handle input files (either in XML or in P–Lingua format) defining P systems from a number of different cell–like P system models. Moreover, the library includes several built–in simulators for each supported model. For the sake of software portability, pLinguaCore can export a P system definition to any convenient output format (currently XML and binary formats are available). This software is not a closed product, but it can be extended to accept new input or output formats and also new models or simulators. The term P–Lingua 2.0 refers to the software package consisting of the above mentioned library together with a user interface called pLinguaPlugin (more details can be found at http://www.p-lingua.org). Finally, in order to illustrate the software, this paper includes an application using pLinguaCore for describing and simulating ecosystems by means of P systems.Ministerio de Educación y Ciencia TIN2006-13425Junta de Andalucía TIC04200

Biodisponibilidad de compuestos fenólicos dietéticos: Revisión

Phenolic compounds are ubiquitous in plant-based foods. High dietary intake of fruits, vegetables and cereals is related to a decreased rate in chronic diseases. Phenolic compounds are thought to be responsible, at least in part, for those health effects. Nonetheless, phenolic compounds bioaccessibility and biotransformation is often not considered in these studies; thus, a precise mechanism of action of phenolic compounds is not known. In this review we aim to present a comprehensive knowledge of the metabolic processes through which phenolic compounds go after intake.Los compuestos fenólicos son ubicuos en alimentos de origen vegetal. La alta ingesta de frutas, vegetales y cereales está relacionada con un bajo índice en padecimientos crónicos. Se cree que los compuestos fenólicos son, en parte, responsables de este efecto benéfico. Sin embargo, la bioaccesibilidad y biotransformación de los compuestos fenólicos generalmente no es considerada en este tipo de estudios. Por lo tanto, no se ha podido obtener un mecanismo de acción de los compuestos fenólicos. En este trabajo, presentamos una revisión de literatura de los procesos metabólicos a través de los cuales los compuestos fenólicos son sometidos despuésde ser ingeridos

Molinos hidráulicos de trigo en México: la Mixteca Alta, Oaxaca

[EN] The first results of a research into the history of wheat and wheat mills in Mexico during colonial times, one of the chapters of a larger project on the "History of hydraulic technology during colonial times" are exposed. In this context, the case of mills established in Oaxaca, particularly in the High Mixteca region, is presented. The information comes primarily from studies of various contemporary authors, published historical sources, archival documents and maps from the colonial times.[ES] Se exponen los primeros resultados de una investigación sobre la historia del trigo y los molinos de trigo en México durante la época novohispana, uno de los capítulos de un proyecto mayor sobre la “Historia de la tecnología hidráulica durante la época colonial”. En ese contexto se presenta el caso de los molino establecidos en Oaxaca, en particular en la Mixteca alta. La información proviene básicamente de estudios de diversos autores contemporáneos, fuentes históricas publicadas, documentos de archivo y mapas novohispanosRojas Rabiela, T.; Gutiérrez Ruvalcaba, I.; Santos Pérez, R. (2015). Molinos hidráulicos de trigo en México: la Mixteca Alta, Oaxaca. En Irrigation, Society and Landscape. Tribute to Tom F. Glick. Editorial Universitat Politècnica de València. 387-401. https://doi.org/10.4995/ISL2014.2014.170OCS38740

Numerical and Experimental Analysis of Optical Frequency Comb Generation in Gain-Switched Semiconductor Lasers

We have performed a systematic experimental and simulation analysis of the optical frequency combs generated by gain-switching single mode laser diodes, either free-running or subjected to optical injection. The simulations have been produced with a dynamical model consisting of three rate equations that include stochastic noise terms. The model parameters have been extracted from experiments. An exhaustive comparison between the simulated and the experimental temporal profiles and optical spectra generated under a wide range of switching and optical injection conditions has been performed. The excellent quantitative agreement found in the entire range of the explored operating conditions supports the validity of the model for the analysis of the comb generation mechanisms. The detailed maps generated provide guidelines for selecting suitable operating conditions for specific comb characteristics.This work was funded by the Ministerio de Economia y Competitividad of Spain (COMBINA, TEC201565212-C3-1-P and TEC201565212-C3-2-P)