Exploring University Performance through Multiple Factor Analysis: A Case Study

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Understanding the differences in catalytic performance for hydrogen production of Ni and Co supported on mesoporous SBA-15

Three mono and bimetallic Nix Co1−x /SBA-15 catalysts (x = 1, 0.5 and 0) with a total metallic content of 10 wt% have been prepared by a deposition–precipitation (DP) method. The catalytic performances on the dry reforming of methane reaction (DRM) have been determined and correlated with their physical and chemical state before and after the catalytic reaction. So, while the nickel monometallic system presents a high activity and stability in the DRM reaction, the Co/SBA-15 catalytic system turns out completely inactive. For its part, the Ni0.5Co0.5/SBA-15 has initially a catalytic performance similar to the Ni/SBA- 15 monometallic system, but rapidly evolving to an inactive system, therefore resembling the behavior of the cobalt-based catalyst. The characterization by TEM and in situ XPS techniques has allowed us to ascribe these differences to the initial state of metallic particles after reduction and their different evolution under reaction conditions. So, while after reduction both nickel containing Nix Co1−x /SBA-15 catalysts (x = 1 and 0.5) present a well dispersed metallic phase, the cobalt monometallic catalyst yields big metallic particles with a heterogeneous distribution of sizes. Additionally, unlike the Ni/SBA-15, the NiCo/SBA-15 system increases during reaction the metallic particle sizes. Besides indicating that the particle size is a major reason determining the catalytic performances, these results suggest that in the Ni–Co system both metals form after reduction a bimetallic phase mainly located inside the mesoporous channels of SBA-15 support. Under DRM reaction conditions, the cobalt is segregated to the surface of the bimetallic particles, which seems to determine the interaction with the support surface SBA-15. This feature gives rise to a much less stable metallic phase which suffers an important sintering process under DRM catalytic conditions. © 2017 Elsevier B.V. All rights reserved. 1. Introduction Supported nickel catalytic systems are currently one of the most important industrial heterogeneous catalysts because its remarkable performance in a number of economically strategic processes [1–5]. Among them, the steam reforming of methane (SRM, CH4 + H2O ↔ 3H2 + CO) can be outlined as the main industrial process for obtaining hydrogen and synthesis gas, used to syn- thesize various important chemicals and fuels [6–9]. Although it is not yet commercially exploited, the dry reforming of methane (DRM, CH4 + CO2 ↔ 2H2 + 2CO) is an especially interesting reac- tion that transforms two of the most harmful greenhouse gases, methane and carbon dioxide, into a mixture of hydrogen and car- bon monoxide [10–12]. Once again, Ni-based catalysts are the most ∗ Corresponding author. E-mail address: [email protected] (A. Caballero). widely tested in the literature for this reforming reaction, even though noble metal based catalysts such as Pt, Ru and Rh are much more performance toward methane conversion. The principal issue comes from the fact that Ni typically undergoes severe deactivation processes, mainly due to coke formation, but also due to sinter- ing of the metallic phase, generating big metallic particles which at the same time, favors the coke formation processes [13–17]. As an alternative to overcome these issues, a number of publications have shown as the use of bimetallic systems, as the combination of nickel and cobalt modified the catalytic performance in steam and dry reforming of methane [18–23]. But, depending on the support or the preparation methods both effects, improvements and wors- ening of the efficiency, have been reported. Main reasons explaining these contradictory findings are probably related with differences in the interaction of metals with support surface, which has been recognized as an essential factor affecting the stability of metal [24–26]. So, a strategy to avoid the growth of metallic particles is the use of special supports, and in particular mesoporous supports.Ministerio Economía y Competitividad de España (MINECO) y fondos FEDER de la Unión Europea-ENE2011-24412 y CTQ2014-60524-

¿Estoy realmente tomando lo que me ha prescrito el médico?

Duración (en horas): Más de 50 horas Destinatario: Estudiante y DocenteLa Química Analítica en el Grado de Farmacia tiene como principal objetivo la resolución teórica y práctica de problemas analíticos relacionados con el ámbito farmacéutico. Para ello, el alumnado debe conocer todas las etapas del proceso general de análisis, las cuales son planteadas en el aula y en el laboratorio como subproblemas estructurantes. Estos subproblemas son abordados compaginando la metodología tradicional y el aprendizaje basado en problemas. A lo largo de toda la asignatura las/os alumnas/os deben realizar distintos tipos de tareas de carácter individual y grupal y una vez adquiridos los objetivos de aprendizaje planteados, deben ser capaces de aplicarlos en la resolución de una serie de problemas analíticos

LA CELOTIPIA COMO CAUSAL DE INIMPUTABILIDAD EN EL DERECHO PENAL

In Colombia in recent years have been presenting a number of deaths that are marked with "passional killings" especially those that are committed to women who are related by a denominator called "jealousy of a couple" to talk about "celotipia" addressed this content from two areas treated in society; mainly from the perspective of forensic psychiatry where the individual is valued and judged as a person who does not have the capacity to understand their actions within the community, therefore they act under a pathology of mental disorder called celotypia; (borderline); then legally addressed where it can be shown in this legal - descriptive investigation that in our Colombian legal system there is anxiety due to the lack of technical and legal elements that lead us to support this type of pathology.En Colombia en los últimos años se han venido presentando un sin número de muertes que están marcadas con los “homicidios pasionales” especialmente aquellos que son cometidos hacia la mujer que están relacionados por un denominante llamado “celos de pareja” para hablar de “celotipia” se abordó este contenido desde dos esferas tratadas en sociedad; principalmente desde la óptica de la psiquiatría forense donde el individuo es valorado y dictaminado como una persona que no tiene la capacidad para comprender su actuar dentro de la comunidad por lo tanto actúa bajo una patología de trastorno mental denominada celotipia; (limítrofe o border line); seguidamente lo abordado jurídicamente donde se puede evidenciar en esta investigación  jurídico – descriptiva que en nuestro ordenamiento jurídico colombiano existe la zozobra por la falta de elementos técnico - jurídicos que nos lleven a apoyar este tipo de patologías

Regulación neuroendocrina del sistema inmune

El sistema inmune recibe señales del sistema nervioso central (cerebro) vía el sistema nervioso autónomo y el sistema endocrino. El sistema inmune, a su vez, envía información al cerebro vía citocinas. Este sistema de retroalimentación es vital para el funcionamiento adecuado del organismo en situaciones normales, y en aquellas en las que la homeostasis se ve perturbada, como en casos de estrés, consumo de drogas (terapéuticas o de abuso), enfermedades infecciosas y cáncer

Solid-phase synthesis of imprinted nanoparticles as artificial antibodies against the C-terminus of the cannabinoid CB1 receptor: exploring a viable alternative for bioanalysis

[EN]The production of artificial anti-CB1 antibodies in nanoparticle format is described using the solid-phase imprinting approach. Instead of whole protein imprinting, a linear C-terminus sequence of the receptor comprising 15 amino acids (458-KVTMSVSTDTSAEAL-472) has been used as template, in accordance with the epitope imprinting approach. This sequence is located intracellularly, and it is involved in coupling to G(i/o) proteins, being responsible for CB1 receptor desensitisation and internalisation. Developed molecularly imprinted materials were found to be in the nanometre scale, with a particle size of 126.4 +/- 10.5 nm at pH 3 (25 oC) and spherical shape. It was also observed that the size was sensible to temperature changes being reduced to 106.3 +/- 15.2 nm at 35 degrees C. Lower critical solution temperature of this polymer was found to be approximate to 33.4 degrees C. The affinity and selectivity of the artificial antibody were assessed through dot blot and Western blot experiments. For the latter, recombinant fusion proteins GST-CB1(414-472) and GST-CB1(414-442) were produced to work respectively as target and negative control proteins. The control protein did not carry the target epitope for being devoid of last 30 amino acids at the C-terminus. The results demonstrated that the anti-CB1 material recognised selectively the target protein, thanks to the presence of the 15-amino acid sequence selected as epitope, which revealed that binding occurred at the C-terminus of the receptor itself. The methodology presented may pave the way for the development of novel imprinted nanomaterials for other proteins included in the superfamily of the G-protein-coupled receptors (GPCR).Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. Funding for this research was provided by the Spanish Ministry of Science, Innovation and Universities (project CTQ2017-85686-R) and by the Basque Government (Research Groups of the Basque University System, Project No IT 1186-19

Prevalence and Risk Factors of Respiratory Syncytial Virus in Children under 5 Years of Age in the WHO European Region: A Systematic Review and Meta-Analysis

A respiratory syncytial virus (RSV) is the major cause of respiratory tract infection in children under 5 years. However, RSV infection in the European Region of the World Health Organization has not been systematically reviewed. The aim was to determine the prevalence and factors associated with RSV in children under 5 years of age in European regions. A systematic review and meta-analysis was performed. CINAHL, Medline, LILACS, ProQuest, SciELO, and Scopus databases were consulted for studies published in the last 5 years, following Preferred Reporting Items for Systematic Reviews and Meta-analysis guidelines. The search equation was “respiratory syncytial virus AND (newborn OR infant OR child) AND (prevalence OR risk factors)”. Studies reporting the prevalence of RSV were eligible for inclusion in the meta-analysis. A total of 20 articles were included. The meta-analytic prevalence estimation of RSV, with a sample of n = 16,115 children, was 46% (95% CI 34–59%). The main risk factors were age, male gender, winter season, and environmental factors such as cold temperatures, higher relative humidity, high concentrations of benzene, exposure to tobacco, and living in urban areas. Robust age-specific estimates of RSV infection in healthy children should be promoted in order to determine the optimal age for immunization. In addition, it is necessary to analyse in greater depth the potentially predictive factors of RSV infection, to be included in prevention strategies