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Papers by Juan Estevan Mosquera González

We have proven that the biomimetic-like synthesis of cannabinoids from citral and the correspondi... more We have proven that the biomimetic-like synthesis of cannabinoids from citral and the corresponding phenolic counterpart may well be carried out using water as a solvent. The influence of different additives such as surfactants was also analyzed. Rationalization of the reaction mode and regiochemistry of the processes were provided in terms of &quot;on water&quot; and &quot;in water&quot; reactions. The same reactions were conducted in organic media using Ga(III) salts as catalysts. Worthy of being underlined, an unprecedented formal [2+2+2] process was found to occur between two citral molecules and the corresponding phenolic species in both aqueous and organic environments. Computational studies were performed in order to gain a comprehensive mechanistic and energetic understanding of the different steps of this singular process. Finally, the influence of SDS micelles in the chemical behavior of olivetol and citral was also pursued using PGSE diffusion and NOESY NMR studies. These data permitted to tentatively propose the existence of a mixed micelle between olivetol and SDS assemblies.

CIMEL: Ciencia e Investigación Médica Estudiantil Latinoamericana, 2009

Objetivo: Determinar algunas caracteristicas epidemiologicas de la enfermedad cerebro vascular (E... more Objetivo: Determinar algunas caracteristicas epidemiologicas de la enfermedad cerebro vascular (ECV) , describir las caracteristicas de la poblacion estudiada segun sexo, edad, procedencia, raza, forma de inicio, ubicacion, tipos y subtipos, sintomas, antecedentes patologicos y mortalidad intrahospitalaria. Materiales y metodos: estudio descriptivo. Lugar: Hospital Regional Docente de Ica. Criterios de inclusion: pacientes ingresados con diagnostico de accidente cerebrovascular. Intervenciones: revision de historias clinicas de archivo entre los anos 2003 y 2006. Principales medidas de resultados: analisis estadistico: porcentajes y medidas de tendencia central, tabuladas en una base de datos con ayuda del programa Microsoft Excel 2003 para Windows®. Resultados: de 152 pacientes ingresados al servicio de Medicina 119 fueron casos de ECV isquemico, 33 casos fueron ECV hemorragico. El principal antecedente patologico fue la hipertension arterial con un 75.0 %. El sintoma mas frecuente...

World Environmental and Water Resource Congress 2006, 2006

The Loxahatchee River is a small stream that discharges into the Loxahatchee Estuary on the easte... more The Loxahatchee River is a small stream that discharges into the Loxahatchee Estuary on the eastern side of South Florida. The river runs through an environmentally sensitive area where the combination of low flows and tidal influence has been subjecting the coastal ecosystem to harmful salinity concentrations. This paper summarizes the bankfull channel capacity analysis of a river reach subject to tidal influence, conducted in support to the development of the Loxahatchee River Restoration Plan (LRRDP). The analysis is based on direct measurements of discharge and stage at four stations between river mile 11.2 and river mile 14.5. The discharge measurements were made with a four-transducer, 2400-kHz Acoustic Doppler Current Profiler (ADCP) with Janus configuration during low flow and high tide amplitude conditions for about half a tidal cycle. Hydraulic analysis of the stage-discharge relations developed from the data collected at each station during this period allowed us to establish that for low flows during high-range tides, the tidal effect propagates upstream up to river mile 12. As a result, the bankfull channel capacity at all stations downstream from this river station is affected by both the tidal range and the base flow from inland. The field data collected at river mile 11.2 shows that, at high tide, the bankfull channel capacity at this station is about 15 percent less than that during low tide.

Impacts of Global Climate Change, 2005

The flow through uncontrolled and partly-controlled culverts in environmentally sensitive areas i... more The flow through uncontrolled and partly-controlled culverts in environmentally sensitive areas is often monitored based on index-velocity measurements by time-of-travel ultrasonic velocity meters (UVM). Index-velocity monitoring consists of measuring the velocity of the flow in a limited region of the flow cross-sectional area—so-called index-velocities—at time intervals on the order of 15 minutes. Indexvelocities are then used to estimate the mean velocities of the flow using site-specific index-velocity ratings, which are established based on index- and mean-velocity data concurrently measured at the site within the expected range of flows. Water stages are also monitored at the culverts’ ends and, together with the culvert geometry, are used to estimate the flow cross-sectional area. The discharge through the culvert is then computed from the estimated mean velocity and respective flow cross-sectional area. The quality and reliability of index-velocity-based discharge records depends directly upon the measurement uncertainty of the data used for developing the rating and the measurement uncertainty of the indexvelocity and stage data from which the discharges are estimated. To estimate the total uncertainty of index-velocity-based discharge records, the total uncertainty of the index-velocity and mean-velocity measurements of each data pair used for establishing the index-velocity rating need to be estimated first. These measurement uncertainties are then combined for estimating the total uncertainty of the indexvelocity rating throughout the range of index velocities. The rating uncertainties and the uncertainties of the monitored index-velocities and stages from which the discharge record is estimated are subsequently combined to compute the uncertainty of each mean discharge estimate. Moreover, since time-average discharges are typically estimated from measurements collected at time intervals on the order of minutes and the uncertainty of each discharge estimate varies as a function of the flow velocity, the uncertainties of the individual values need to be combined for estimating the total uncertainty of daily, monthly, and annual mean discharges. The evaluation of uncertainty of discharge records is not yet a common practice in flow monitoring. In this paper, we present an evaluation of UVM-measurement uncertainty based on the First-Order Taylor Series Expansion (FOTSE) method for propagation of uncertainty for an uncontrolled culvert site in the South Florida Water Management District (SFWMD). In this evaluation, we show that the precision uncertainty of the index-velocity measurements is not only a function of the frequency of the samples and the sampling time span, but also of the time scale of the turbulence intermittency of the flow. Moreover, we show that since the characteristic time scale is a function of the maximum velocity in the culvert, the precision uncertainty of UVM measurements is a function both the sampling time in the monitoring protocol and the time span over which the data for determining the precision uncertainty are collected.

Revista Universidad de …, 2009

... Pero me sigue gustando el olor del ajo y el vino tinto. Estoy comprometido con una chica ital... more ... Pero me sigue gustando el olor del ajo y el vino tinto. Estoy comprometido con una chica italiana preciosa. Puede darme un hijo y un hogar. Sólo conoce a un hombre, a mí, Max Monetti. Y punto.Irene: ¿No quiere saber mi historia? Max: La conozco. Se siente sola. ...

Cuadernos de Investigación Urbanística, 2011

La energía es un elemento clave en el desarrollo económico y social de un territorio, que contrib... more La energía es un elemento clave en el desarrollo económico y social de un territorio, que contribuye de forma fundamental a la creación de riqueza, bienestar y empleo en una región. Actualmente se consume en España más del doble de energía que en 1975. La demanda de energía en las ciudades, independientemente de su tamaño, supone algo más de la mitad del consumo energético español. Esta concentración de consumo requiere una gran red energética de infraestructuras tanto de transporte como de distribución. Habitualmente los puntos de consumo se encuentran alejados de las centrales de generación, lo que obliga a que las redes de transporte de energía tengan que cubrir largas distancias y atravesar amplios territorio produciendo un considerable impacto sobre el entorno natural. El objetivo de este trabajo es analizar el impacto de las actividades energéticas sobre el medio natural, haciendo especial énfasis en el transporte y distribución de energía eléctrica. El estudio se centra en la Comunidad de Madrid que presenta especiales características: un reducido territorio con un alto porcentaje de protección ambiental, una gran densidad de población y un fuerte consumo de energía. Además la falta de generación en su territorio obliga a un importante desarrollo de redes de transporte de energía eléctrica ya que importar casi la totalidad de la energía que consume.

... of Science and Technology. 6 Page 7. REFERENCES 1. HA Videla, LK Herrera A comparative study... more ... of Science and Technology. 6 Page 7. REFERENCES 1. HA Videla, LK Herrera A comparative study on biodeterioration and weathering effects in three sites of the Latin American cultural heritage. In: Molecular Biology and ...