BURJC-Digital es el nombre del Repositorio Institucional de la Universidad Rey Juan Carlos. Tiene como objetivo archivar y preservar la producción científica resultante de la actividad académica e investigadora de la comunidad universitaria, con el fin de difundirla en acceso abierto.
Envíos recientes
Association between hypertension and selfperception of health status: Findings from a decade population-based survey in Spanish adults
(National Library of Science, 2025-05-07) Martín-Fernández , Jesús; Alonso-Safont, Tamara; Polentinos-Castro, Elena; Rodríguez-Martínez, Gemma; González-Anglada, Mª Isabel; Bilbao-González, Amaia; del-Cura-González, Mª Isabel
Objective
This study, conducted in the community setting, aimed to assess and discuss how a diagnosis of arterial hypertension affects self-perceived health status, examining the association with potential explanatory factors and comparing its impact with that of other chronic conditions.
Methods
Cross-sectional observational study using the 2011–2012 and 2017 Spanish National Health Surveys and the 2020 European Health Interview Survey for Spain as data sources. Health perception was categorised as very good, good, fair, bad, or very bad. The independent variables recorded demographic, social, clinical, and lifestyle information. The associations between variables were evaluated via a generalisation of an ordered logit model.
Results
A total of 66,168 subjects were included (21,007 in 2011, 23,089 in 2017, and 22,072 in 2020), 21.6% of whom were diagnosed with hypertension, 51.3% were women, PLOS One | https://doi.org/10.1371/journal.pone.0322577 May 7, 2025 2 / 11 and the average age was 48.24 (18.89) years. Around one in five people in the general population reported a “very good” health status. The probability of reporting a “very good” health condition decreased with a diagnosis of hypertension (6.2%; CI 95%: 3.1–9.3%) and hypertensive medication (4.5%; CI 95%: 1.8–7.3%). Such associations were independent of age, gender, social group, other chronic conditions or limitations, or various lifestyle habits. In contrast, no association was found with reporting a “bad” or “very bad” health status.
Conclusion
Being diagnosed with hypertension and prescription of antihypertensive medication are associated with a lower probability of reporting a “very good” health status, irrespective of other comorbidities or complications related to the diagnosis.
MgO-based catalysts for selective delignification of lignocellulosic waste and carboxylic acids production under mild hydrothermal conditions
(Elsevier, 2025-08) Vidal, Nora; Ventura, María; Orfila, María; Martínez, Fernando; Melero, Juan Antonio
Lignocellulosic biomass offers a sustainable alternative to traditional raw materials. However, its complex structure, and particularly the presence of lignin, presents a significant challenge for its conversion into valuable products. This study explores the catalytic performance of magnesium oxide (MgO) based materials for the selective delignification of lignocellulosic waste and concomitant carboxylic acids production. Different MgO samples have been synthesized through various synthetical methods with the purpose of promoting the selective delignification of a lignocellulose waste while minimizing the degradation of other polymers (cellulose and hemicellulose). The resultant lignin-free holocellulose solid after selective depolymerization might be used in subsequent fermentation processes. The catalytic results demonstrated that MgO synthesized by a sol-gel method exhibited the highest catalytic activity, achieving ca. 90 % lignin conversion with minimal degradation of cellulose and hemicellulose and outstanding production of carboxylic acids (ca. 30 % of the carbon of the degraded polymers was converted into carboxylic acids). The high concentration of medium-strength base sites combined with significant macroporosity are crucial for enhancing the catalytic performance of MgO-based catalysts. Importantly, these results were achieved under mild conditions (120 ◦ C) using water as a solvent and without addition of external oxidant agents. Furthermore, the study observed a significant production of valuable (di) carboxylic acids, such as fumaric acid during the depolymerization process over optimized MgO catalyst. This research provides valuable insights into the potential of MgO as a sustainable catalyst for the selective conversion of lignin present in lignocellulosic biomass into valuable chemicals and biofuels.
Spotlight : crónica de una investigación
(Dirigido Por, 2016-01) Tejeda, Carlos
Análisis del film "Spotlight" (Tom McCarthy, 2015)
Zr-modified USY zeolite as an efficient catalyst for the production of bio-jet fuel precursors from levulinic acid and furfural in the absence of solvent
(Elsevier, 2025-01-23) Uricochea, Natalia; Uzquiano, Victor; Paniagua, Marta; Morales, Gabriel; Melero, Juan A.
The high potential of using levulinic acid and furfural as platform molecules for the production of oxygenated adducts suitable as precursors for SAF synthesis is studied through the aldol condensation of both molecules. The
research is the first-time demonstration of solventless acid-catalysed levulinic acid/furfural aldol condensation. The catalytic performance of a commercial H-USY zeolite and two post-synthetic variations thereof, with different dealumination degree and Zr loading, is analyzed, aiming at tuning the acid catalytic properties. The catalyst with an almost complete Al removal accompanied by the highest Zr wt% (Zr-USY-2) gave the best results in terms of selective conversion of furfural, pointing out to the Lewis acid sites as the main active sites to promote the aldol condensation reaction. An experimental design allowed to identify the optimal LA/FAL molar ratio (9/1) and reaction temperature (140 ◦C), while catalyst loading presented a minor significance. The optimization of the reaction parameters allowed to achieve a maximum furfural conversion of 88 %, combined with a yield towards the desired C10 adducts of 55 %. Furthermore, despite the catalytic performance of this material is slightly impaired in consecutive reaction cycles, it can be recovered with a thermal regeneration step, indicating a good reusability.
Paremos los contenidos de autolesiones en redes sociales
(Universidad Rey Juan Carlos, 2022) Martínez Pastor, Esther; Ángel- Nicolas, Miguel; Atauri- Mezquida, David; Blanco-Ruiz, Marian
Guía con recomendaciones para saber qué hacer cuando ves imágenes o mensajes de autolesiones no suicidas (ANS) en plataformas como Instagram, X (antiguo Twitter) o TikTok.