Evaluation of the Environmental Performance of Adsorbent Materials Prepared from Agave Bagasse for Water Remediation: Solid Waste Management Proposal of the Tequila Industry

In the present research work, the use of agro-industrial waste such as agave bagasse from the tequila industry was carried out. The agave bagasse was treated to obtain biosorbent and hydrochar materials. Direct Blue 86 was used as an adsorbate model to evaluate the performance of both materials. The adsorption studies showed an adsorption capacity of 6.49 mg g(-1) in static and 17.7 mg g(-1) in dynamic, associated with a physisorption process between functional groups of the material and the dye. The characterization of the biosorbent showed that the material was mainly composed of macroporous fibers with a surface area <5.0 m(2) g(-1). Elemental analysis showed a majority composition of C (57.19 wt%) and O (37.49 wt%). FTIR and XPS analyses showed that the material had C-O, C=O, -OH, O-C=O, and -NH2 surface groups. RAMAN and TGA were used to evaluate the composition, being cellulose (40.94%), lignin (20.15%), and hemicellulose (3.35%). Finally, the life-cycle assessment at a laboratory scale showed that the proposed biosorbent presents a 17% reduction in several environmental aspects compared to hydrochar, showing promise as an eco-friendly and highly efficient method for the remediation of water contaminated with dye, as well as being a promising alternative for the responsible management of solid waste generated by the tequila industry.Direccion de Investigacion-Universidad Autonoma de Guadalajara through "Convocatoria Proyectos de Investigacion para incidir en el entorno UAG 2022"Direccion de Investigacion-Universidad Autonoma de Guadalajar

Modelos globales del campo magnético terrestre para los últimos 3000 años: discrepancias según las bases de datos usadas

La modelización global del campo magnético terrestre no es sólo fundamental para comprender cómo funciona y varía en el tiempo, sino también para constreñir los modelos de geodinamo y corregir las tasas de producción de isótopos cosmogénicos. Obtener modelos suficientemente realistas depende en gran medida de las bases de datos empleadas. Los datos arqueomagnéticos y volcánicos proporcionan un registro casi instantáneo del campo, debido al proceso de adquisición de la remanencia magnética (termorremanencia). Este hecho los hace idóneos para estudiar en detalle la evolución del campo magnético terrestre. Sin embargo, su distribución espacial y temporal es muy heterogénea. Además la calidad de algunos registros, especialmente de intensidad, es muy variable, lo que produce ciertas inconsistencias en los modelos. En este trabajo presentamos cuatro modelos globales para los últimos 3000 años generados a partir del análisis en armónicos esféricos (SHA) usando diferentes bases de datos: 1) datos arqueomagnéticos (SHA3k.a), 2) datos arqueomagnéticos con un criterio de selección de calidad (SHAQ3k.a), 3) datos arqueomagnéticos y volcánicos (SHA3k.av) y 4) datos arqueomagnéticos y volcánicos aplicando un criterio de selección de calidad (SHAQ3k.av). Se evalúan las discrepancias entre ellos y se comparan con modelos globales del campo geomagnético ya publicados (SHA.DIF.14k, ARCH3k.1, CALS3k.4b, pfm9k.1a).SAC y MLO dan las gracias al proyecto CGL2014-54112-R del Ministerio Español de Economía y Competitividad y a la beca FPI BES-2012-052991, que ha permitido a SAC llevar a cabo este trabajo. FJPC agradece a su proyecto postdoctoral 659901- CLIMAGNET, programa Europeo Marie Curie.Peer Reviewe

Observing the onset of outflow collimation in a massive protostar

The current paradigm of star formation through accretion disks, and magnetohydrodynamically driven gas ejections, predicts the development of collimated outflows, rather than expansion without any preferential direction. We present radio continuum observations of the massive protostar W75N(B)-VLA 2, showing that it is a thermal, collimated ionized wind and that it has evolved in 18 years from a compact source into an elongated one. This is consistent with the evolution of the associated expanding water-vapor maser shell, which changed from a nearly circular morphology, tracing an almost isotropic outflow, to an elliptical one outlining collimated motions. We model this behavior in terms of an episodic, short-lived, originally isotropic, ionized wind whose morphology evolves as it moves within a toroidal density stratification.Comment: See also Supplementary Materials (SupMat_carrasco-gonzalez_etal_astroph.pdf) within the source file

Evaluación objetiva de destrezas laparoscópicas básicas a partir de métricas obtenidas con el simulador virtual SINERGIA

Las técnicas laparoscópicas se han convertido en patrón oro en muchos procedimientos quirúrgicos, pero implican un proceso de adquisición de destrezas más complejo que en el caso de la cirugía abierta. En esta fase formativa, los simuladores virtuales tienen un papel muy importante puesto que permiten evaluar de forma objetiva la ejecución de una tarea quirúrgica mediante la extracción automática de métricas. Este trabajo de investigación presenta un análisis de las métricas calculadas por el simulador virtual SINERGIA con el fin de poder llevar a cabo una evaluación objetiva de las destrezas laparoscópicas básicas

Preparation of organic monolithic columns in polytetrafluoroethylene tubes for reversed-phase liquid chromatography

[EN] In this work, a method for the preparation and anchoring of polymeric monoliths in a polytetrafluoroethylene (PTFE) tubing as a column housing for microbore HPLC is described. In order to assure a covalent attachment of the monolith to the inner wall of the PTFE tube, a two-step procedure was developed. Two surface etching reagents, a commercial sodium naphthalene solution (Fluoroetch®), or mixtures of H2O2 and H2SO4, were tried and compared. Then, the obtained hydroxyl groups on the PTFE surface were modified by methacryloylation. Attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectroscopy and scanning electron microscopy (SEM) confirmed the successful modification of the tubing wall and the stable anchorage of monolith to the wall, respectively. Special emphasis was also put on the reduction of the unwanted effects of shrinking of monolith during polymerization, by using an external proper mold and by selecting the adequate monomers in order to increase the flexibility of the polymer. Poly(glycidyl methacrylate-co-divinylbenzene) monoliths were in situ synthesized by thermal polymerization within the confines of surface-vinylized PTFE tubes. The modified PTFE tubing tightly held the monolith, and the monolithic column exhibited good pressure resistance up to 20 MPa. The column performance was also evaluated via the isocratic separation of a series of alkylbenzenes in the reversed-phase mode. The optimized monolithic columns gave plate heights ranged between 70 and 80 um. The resulting monoliths were also satisfactorily applied to the separation of proteins.This work was supported by projects CTQ2014-52765-R (MINECO of Spain and Fondo Europeo de Desarrollo Regional, FEDER) and PROMETEO/2016/145 (Conselleria d'Educacio, Investigacio, Cultura i Esport, Generalitat Valenciana, Spain). The authors also thank Dr. P. Amoros del Toro from Institute of Materials Science (University of Valencia) and Dr. S. Armenta from Department of Analytical Chemistry for their help in surface area and FT-IR measurements, respectively.Catalá-Icardo, M.; Torres-Cartas, S.; Meseguer-Lloret, S.; Gómez Benito, C.; Carrasco-Correa, E.; Simó-Alfonso, EF.; Ramis-Ramos, G.... (2017). Preparation of organic monolithic columns in polytetrafluoroethylene tubes for reversed-phase liquid chromatography. Analytica Chimica Acta. 960:160-167. https://doi.org/10.1016/j.aca.2017.01.01216016796

La ruta del mosaico romano: el sur de hispania (Anadalucía y Algarve)

A Hispânia meridional corresponde ao sul de duas províncias romanas – a Bética (actual Andaluzia) e a Lusitania (Portugal) – que tiveram grande prosperidade económica, desde a época de Augusto até ao final da Antiguidade (finais do século IV). Os mosaicos que decoravam o chão das casas mais ricas aparecidas nos últimos vinte anos nas escavações em cidades – como em Faro/Ossonoba, na Lusitania e em Écija/ Astigi, na Bética – e nas villae rurais que se encontram maioritariamente nos arredores das cidades – como em Cerro da Vila (Vilamoura)e em Milreu (Estoi), no Algarve – demonstram o elevado nível de desenvolvimento económico,social e cultural das duas províncias durante o período compreendido entre os séculos I e IV d.C