Proceso de desmezclado no lineal de disoluciones mediante imágenes hiperespectrales.

Programa de Doctorado en Empresa, Internet y Tecnologías de las Comunicaciones por la Universidad de Las Palmas de Gran CanariaLas imágenes hiperespectrales se han convertido en una herramienta crucial para el análisis detallado de compuestos químicos, permitiendo obtener firmas espectrales únicas de cada sustancia. En particular, el estudio de compuestos orgánicos líquidos mediante esta tecnología ofrece un gran potencial en aplicaciones industriales, ambientales y biomédicas. Esta tesis explora el uso de imágenes hiperespectrales para el análisis de compuestos orgánicos líquidos, desarrollando metodologías para el desmezclado espectral de mezclas homogéneas. En primer lugar, se realizó una clasificación de líquidos orgánicos puros (hidrocarburos, alcoholes y ésteres) con una precisión del 95-99 % usando machine learning, a pesar de no incluir longitudes de onda del infrarrojo medio y lejano. Luego, se propuso el método "Number of Endmembers by Energy Criteria"(NEEC) para estimar el número de componentes en disoluciones, con un 86.6 % de precisión en escenarios no lineales complejos. Finalmente, se implementó un enfoque progresivo para extraer firmas espectrales y abundancias en mezclas de 2 a 4 componentes, alcanzando alta precisión en escenarios de baja y media complejidad. Estos avances destacan el potencial de las imágenes hiperespectrales para aplicaciones en química analítica, control de calidad y monitoreo ambiental.Hyperspectral imaging has become a crucial tool for the detailed analysis of chemical,compounds, allowing for the identification of unique spectral signatures of each substance. Specifically, the study of liquid organic compounds using this technology offers significant potential for industrial, environmental, and biomedical applications. This thesis explores the use of hyperspectral imaging for analyzing liquid organic compounds by developing methodologies for spectral unmixing of homogeneous mixtures. First, a classification of pure organic liquids (hydrocarbons, alcohols, and esters) was performed with an accuracy of 95-99 % using machine learning, despite not including mid- and far-infrared wavelengths. Then, the "Number of Endmembers by Energy Criteria"(NEEC) method was proposed to estimate the number of components in solutions, achieving an accuracy of 86.6 % in complex nonlinear scenarios. Finally, a progressive approach was implemented to extract spectral signatures and abundances in mixtures of 2 to 4 components, achieving high accuracy in low- and medium-complexity scenarios. These advancements underscore the potential of hyperspectral imaging for applications in analytical chemistry, quality control, and environmental monitoring

The brown alga Rugulopteryx okamurae: insights into epifaunal diversity across marginal populations in Gran Canaria

Biological invasions pose significant threats to biodiversity, primarily through the depletion of natural resources and the disruption of local ecosystems. Our study focuses on Rugulopteryx okamurae (E. Y. Dawson) I·K. Hwang, W.J. Lee, and H.S. Kim, an invasive alga proliferating in the Macaronesia and Mediterranean regions. This research examines the epifaunal assemblages associated with R. okamurae across eastern and northeastern zones in Gran Canaria, Canary Islands. A total of 11,398 individuals from 63 species within five taxonomic groups were collected, with Arthropoda dominating the samples (88.68 % of the overall abundance), particularly the amphipods Apohyale perieri and A. stebbingi. Significant differences in species richness and individual abundance were observed between populations from San Cristóbal, Jinámar and Ojos de Garza. The central populations exhibited the highest species richness, while the northern populations showed the lowest. Multivariate analyses revealed distinct community compositions between the edge and central populations, underscoring the invasive alga's capacity to support diverse and abundant epifaunal assemblages. Moreover, R. okamurae demonstrated remarkable dominance in the study area, achieving total coverage of up to 100 % at certain sampling sites. This extensive coverage highlights the alga's ability to sustain a rich and varied epifaunal community, characterized by both species abundance and high biodiversity. The findings emphasize the need for targeted conservation and management strategies to mitigate the spread of R. okamurae and protect local biodiversity from further disruption.110,5452,1Q2Q2SCIE11,

Las palabras amerindias que usamos todos los días

Los préstamos lingüísticos son el recurso más habitual para incorporar al vocabulario conceptos u objetos que no existen en el idioma propio

Cystathionine β-Synthase Deficiency in the E-HOD Registry—Part II: Dietary and Pharmacological Treatment

Cystathionine β-synthase (CBS) deficiency (classical homocystinuria) has a wide range of severity. Mildly affected patients typically present as adults with thromboembolism and respond to treatment with pyridoxine. Severely affected patients usually present during childhood with learning difficulties, ectopia lentis and skeletal abnormalities; they are pyridoxine non-responders (NR) or partial responders (PR) and require treatment with a low-methionine diet and/or betaine. The European network and registry for Homocystinurias and methylation Defects (E-HOD) has published management guidelines for CBS deficiency and recommended keeping plasma total homocysteine (tHcy) concentrations below 100 μmol/L. We have now analysed data from 311 patients in the registry to see how closely treatment follows the guidelines. Pyridoxine-responsive patients generally achieved tHcy concentrations below 50 μmol/L, but many NRs and PRs had a mean tHcy considerably above 100 μmol/L. Most NRs were managed with betaine and a special diet. This usually involved severe protein restriction and a methionine-free amino acid mixture, but some patients had a natural protein intake substantially above the WHO safe minimum. Work is needed on the methionine content of dietary protein as estimates vary widely. Contrary to the guidelines, most NRs were on pyridoxine, sometimes at dangerously high doses. tHcy concentrations were similar in groups prescribed high or low betaine doses and natural protein intakes. High tHcy levels were probably often due to poor compliance. Comparing time-to-event graphs for NR patients detected by newborn screening and those ascertained clinically showed that treatment could prevent thromboembolism (risk ratio 0.073) and lens dislocation (risk ratio 0.069).1

The cartouches in the cartography of the Andalusian territory (16th-17th centuries)

Los mapas están compuestos por elementos geográficos y ornamentales. Estos últimos además de pertenecer a la marginalia decorativa de la cartografía nos transmite un mensaje concreto, cumpliendo la función para la que había sido creado. A la vez, los tipos y la decoración de cartelas han ido evolucionando paralelamente al proceso artístico imperante en cada momento histórico. A lo largo del periodo estudiado las características de estos grabados han sido muy distintos tanto por la belleza ornamental como por las implicaciones sociales o políticas que han pretendido. Durante esta época se han seleccionado todos aquellos mapas que tenían representado el territorio andaluz, para así examinar la transformación de las cartelas en una misma región geográfica.The maps are composed of geographical and ornamental elements. The latter, in addition to belonging to the decorative marginality of cartography, transmits a specific message, fulfilling the function for which it was created. At the same time, the types and decoration of cartouche have evolved in parallel with the artistic process prevailing in each historical moment. Throughout the period studied the characteristics of these engravings have been very different both for the ornamental beauty and for the social or political implications they have intended. During this time, all those maps that represented the Andalusian territory were selected, in order to examine the transformation of the cartouche in the same geographical region.529511190,144Q2ESCI10,0ERIH PLU

Working on argumentation: the impact of educational intervention on the use of discourse markers in secondary school students

En este estudio se exponen los resultados del análisis cuantitativo y cualitativo de la influencia de diversas actividades didácticas en el empleo de marcadores discursivos en textos argumentativos escritos por escolares de 4.º de la ESO de Las Palmas de Gran Canaria. El propósito es evaluar si existe una mejora en la cantidad y variedad de marcadores textuales tras la intervención educativa, comparando las producciones escritas antes y después de la implementación de dichas actividades en una muestra de 250 estudiantes. Los resultados obtenidos pueden ofrecer contribuciones valiosas para el desarrollo de métodos eficaces en la enseñanza de la expresión escrita del alumnado.This study presents the results of the quantitative and qualitative analysis of the influence of various didactic activities on the use of discourse markers in argumentative texts written by 4th year ESO schoolchildren from Las Palmas de Gran Canaria. The purpose is to evaluate whether there is an improvement in the quantity and variety of textual markers after the educational intervention, comparing the written productions before and after the implementation of said activities in a sample of 250 students. The results obtained can offer valuable contributions to the development of effective methods in teaching written expression to young people.320,0Q46,1ERIH PLU