73 research outputs found
Segundo Congreso Salesiano de Ciencia, TecnologĂa e InnovaciĂłn para la Sociedad
La segunda ediciĂłn del Congreso Salesiano de Ciencia, TecnologĂa e InnovaciĂłn para la Sociedad, CITIS, realizado el 2 y 3 de diciembre de 2015 y organizado por la Universidad PolitĂ©cnica Salesiana (sede Guayaquil), ofreciĂł un espacio idĂłneo para la presentaciĂłn, difusiĂłn e intercambio de importantes investigaciones (nacionales e internacionales) a los docentes investigadores y a la comunidad universitaria en general.
Los trabajos recogidos en estas Memorias AcadĂ©micas pertenecen a diferentes lĂneas de investigaciĂłn del ĂĄrea de la IngenierĂa: Telecomunicaciones, AutomatizaciĂłn y Control, Procesos Industriales, Sistemas ElĂ©ctricos de Potencia, TelemĂĄtica e InformĂĄtica Aplicada, ĂĄreas de interĂ©s en esta segunda ediciĂłn del CITIS. Cabe destacar que se evidencia la preocupaciĂłn por la dimensiĂłn humana y social mediante el desarrollo responsable de la ciencia y la tecnologĂa.
La realización de este Congreso ha puesto en evidencia la importancia y pertinencia de la actividad investigativa que se genera en las universidades (en proyectos desarrollados por los docentes investigadores e, incluso, por los estudiantes de grado y posgrado), asà como los altos niveles de compromiso académico y social
Rigorous Analysis of Available Data from Cerro Prieto and Las Tres Virgenes Geothermal Fields with Calculations for Expanded Electricity Generation
Cerebellar astrocytes co-express several ADP receptors. Presence of functional P2Y13-like receptors
Astrocytes exhibit a form of excitability based on variations of intracellular Ca2+ concentration in response to various stimuli, including ADP, ATP, UTP and dinucleotides. Here, we investigate the presence of the recently cloned ADP-sensitive receptors, P2Y12 and P2Y13 subtypes, which are negatively coupled to adenylate cyclase, in cerebellar astrocytes. We checked the effect of specific agonists, 2-methylthioadenosine diphosphate (2MeSADP) and ADP, on adenylate cyclase stimulation induced by isoproterenol. Both agonists significantly reduced the cAMP accumulation induced by isoproterenol. The inhibitory effect was concentration-dependent with IC50 values of 46 ± 13 and 23 ± 14 nM for 2MeSADP and ADP, respectively. The experiments were carried out in the presence of MRS-2179, a specific antagonist of P2Y1 receptor, to avoid any contribution of this receptor. Using fura-2 microfluorimetry we also proved that astrocytes responded to 2MeSADP stimulations with calcium responses in the absence and also in the presence of MRS-2179. Both effects, inhibition of adenylate cyclase and intracellular calcium mobilization, were not modified by 2MeSAMP, an antagonist of P2Y12 receptor, suggesting that were mediated by P2Y13-like receptors
Habitat specificity of a threatened and endemic cliff-dwelling halophyte
Research ArticleCoastal areas and other saline environments are major contributors to regional and global biodiversity
patterns. In these environments, rapidly changing gradients require highly specialized plants like halophytes.
In European coastal cliff-tops, rocky and sandy seashores, and saltmarshes, typical halophytes from the genus
Limonium are commonly found. Among them, the aneuploid tetraploid (2n Œ 4x Œ 35, 36, 37) Limonium multiflorum,
endemic to the west coast of Portugal, is an interesting case study for investigating the ecology and conservation
of a halophyte agamospermic species. Although it is listed in the IUCN red list of threatened species,
information on its population size or rarity, as well as its ecology, in some respects is still unknown. Field surveys
in the largest known population were performed (Raso cape, Portugal) in order to determine habitat requirements
and conservation status. A total of 88 quadrats were monitored, 43 of which contained at least one L. multiflorum
individual. For each sampled quadrat, four abiotic and four biotic variables as well as two spatially derived variables
were recorded. Principal component analysis and cluster analysis showed narrow habitat specificity for this species
which appeared to be intolerant to competition with invasive alien plants. We conclude that in situ conservation
in a local âhotspotâ of this rare and vulnerable species emerges as a priority in order to ensure that biodiversity is not los
Territorial analysis of Aedes aegypti distribution in two Colombian cities: a chorematic and ecosystem approach
Outcomes from elective colorectal cancer surgery during the SARS-CoV-2 pandemic
This study aimed to describe the change in surgical practice and the impact of SARS-CoV-2 on mortality after surgical resection of colorectal cancer during the initial phases of the SARS-CoV-2 pandemic
AnaÌlisis del efecto de un programa de estiÌmulo matemaÌtico en adolescentes en riesgo de exclusioÌn social
En este trabajo se presenta un anaÌlisis de los resultados de un programa socioeducativo de incentivo del estiÌmulo matemaÌtico, dirigido a adolescentes en riesgo de exclusioÌn social. El objetivo de nuestra investigacioÌn es la identificacioÌn de variaciones sobre el rendimiento acadeÌmico en matemaÌticas de este tipo de alumnado, una vez que ha participado en dicho programa (Blanco, Gorgal, Salgado y Diego-MantecoÌn, 2017)
AnaÌlisis de actividades STEAM en una educacioÌn matemaÌtica inclusiva
En este trabajo se presentan los primeros resultados de un programa de intervencioÌn con adolescentes en riesgo de exclusioÌn social. Este programa socioeducativo, llamado AnaquinÌos MatemaÌticos, tiene como objetivo analizar coÌmo las actividades STEAM estimulan a los estudiantes en relacioÌn a las matemaÌticas. Estas actividades se articulan en base a dos ejes comunes: integrar conocimientos de diferentes aÌreas y trabajar en un ambiente colaborativo, principales fundamentos de la metodologiÌa STEAM (Durando, 2013; McDonald, 2016)
LHC optics commissioning: A journey towards 1% optics control
Since 2015 the LHC has been operating at 6.5Â TeV. In 2016 the ÎČ-functions at the interaction points of ATLAS and CMS were squeezed to 0.4Â m. This is below the design ÎČ*=0.55ââm at 7Â TeV, and has been instrumental to surpass the design luminosity of ââ. Achieving a lower than nominal ÎČ* has been possible thanks to the extraordinary performance of the LHC, in which the control of the optics has played a fundamental role. Even though the ÎČ-beating for the virgin machine was above 100%, corrections reduced the rms ÎČ-beating below 1% at the two main experiments and below 2% rms around the ring. This guarantees a safe operation as well as providing equal amount of luminosity for the two experiments. In this article we describe the recent improvements to the measurement, correction algorithms and technical equipment which allowed this unprecedented control of the optics for a high-energy hadron collider
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