El lactosuero dulce (LD) constituye uno de los principales subproductos de la industria lactea. D... more El lactosuero dulce (LD) constituye uno de los principales subproductos de la industria lactea. Dada su alta concentracion de materia organica y nutrientes, el inadecuado manejo de este efluente puede generar serios problemas ambientales. El presente estudio tuvo como objetivo evaluar el potencial uso del LD para la obtencion de biomasa probiotica y acido lactico, a traves de la optimizacion de variables de produccion. Para ello, fue analizada la cinetica de crecimiento de dos cepas probioticas de Lactobacillus sp., evaluando condiciones operacionales correspondientes al tipo de cultivo (monocultivo y co-cultivo), sustrato (fresco y desproteinizado), tasa de dilucion y agitacion. Posteriormente, fue verificada la cinetica de crecimiento y produccion de biomasa y de acido lactico a una escala de 20L, en un sistema operado en regimen discontinuo. Las mejores condiciones de crecimiento fueron obtenidas empleando LD fresco diluido, co-cultivo y agitacion intermitente a 60 r.p.m. El esca...
The present work reports on the development and the experimental results of the investigation wit... more The present work reports on the development and the experimental results of the investigation with a CO2 laser excited by a capacitive radio frequency discharge. In a gas mixture composed by carbon dioxide, nitrogen and helium, in the proportions of 1:10.2:11.5 respectively. The system has a gas closed network of pipe with 7.6 cm internal diameter and a length of 5.5 m. The system uses a roots pump for the gas circulation. The gas flow in the discharge chamber is parallel to the optical axis and it has an approximate speed of 75 m/s. The gas mixture is maintained at temperatures between 14 to 18 °C. The radio frequency source can deliver up to 5 kW rms. The discharge chamber has aluminum electrodes attached externally with ceramic to a boro-silicate tube of 2.5 cm of diameter. The electrodes are 0.5 cm width and a 10 cm long. The obtained discharge is traverse to the gas flow and to the optical axis of the resonator, which are parallels. The optic resonator is composed by a back sph...
Universal screening is a proactive method for identifying student risk, yet remains under-utilize... more Universal screening is a proactive method for identifying student risk, yet remains under-utilized in school systems. Instead, many schools rely on teacher reports and referrals without accounting for different informant perspectives. In the current study, multi-informant universal screening in evaluated using a trifactor model. The study utilized the Social, Academic, and Emotional Behavior Risk Screener (SAEBRS), specifically the teacher (SAEBRS-TRS) and student (mySAEBRS) self-report forms, with items indicating risk for social, academic, and emotional behavior. Data from a national sample of over 24,000 K-12 teacher-student dyads were used to examine the extent and variance of discrepant reports between students and teachers of common, perspective, and item factors. Results demonstrated that informant perspective factors were a strong predictor for student and teacher emotional behavior item ratings. Whereas age had a positive effect on younger student reports of risk on the behavior items compared to older student reports, teachers showed the opposite effect. The teacherperspective of social and emotional behaviors of students was predicted by gender. Implications and directions for future research are further discussed.
Este libro recoge los frutos de la colaboración y trabajo conjunto de un grupo de Universidades I... more Este libro recoge los frutos de la colaboración y trabajo conjunto de un grupo de Universidades Iberoamericanas entre 2007 y 2012 el marco de las actividades del Programa de Cooperación Comunidad, Agua y Bosque en Centroamérica (CAB ...
We present a case of a 32-year-old female patient with the diagnosis of gallstone disease and cho... more We present a case of a 32-year-old female patient with the diagnosis of gallstone disease and choledocholithiasis. Prior to in vivo surgery, we practiced the critical steps of the procedure using a proposed inert training model. We performed a robot-assisted laparoscopic common bile duct exploration, obtaining one stone. The operating time was 140 min (console time: 120 min) with no complications during the procedure. The patient was discharged 2 days after the operation. Robot-assisted minimally invasive surgery of the common bile duct is a safe and effective procedure and seems to have some benefits over conventional laparoscopic surgery.
El objetivo es analizar la percepción de los turistas de negocios respecto a la responsabilidad s... more El objetivo es analizar la percepción de los turistas de negocios respecto a la responsabilidad social empresarial (RSE) y consumo responsable (CR), identificando la asociación entre estas variables. Método: Se trata de una investigación cuantitativa, empleando pruebas estadísticas T-student, ANOVA y correlaciones para la comprobación de hipótesis. Resultados: Se evidencia que entre la RSE y la CR existen asociaciones significativas y positivas, denotando la importancia de la interacción con el cliente para dar a conocer las prácticas de RSE. Limitaciones del estudio: La naturaleza transversal y el tamaño de la muestra. Originalidad: El estudio es relevante para el sector turístico como estrategia de RSE para atraer clientes con demandas alineadas por el CR. Hallazgos: La edad de los turistas y la categoría del hotel influyen en la percepción sobre la RSE y el CR, al encontrar que entre más jóvenes y mayor sea la categoría del hotel mejor se aprecia las variables.
El lactosuero dulce (LD) constituye uno de los principales subproductos de la industria lactea. D... more El lactosuero dulce (LD) constituye uno de los principales subproductos de la industria lactea. Dada su alta concentracion de materia organica y nutrientes, el inadecuado manejo de este efluente puede generar serios problemas ambientales. El presente estudio tuvo como objetivo evaluar el potencial uso del LD para la obtencion de biomasa probiotica y acido lactico, a traves de la optimizacion de variables de produccion. Para ello, fue analizada la cinetica de crecimiento de dos cepas probioticas de Lactobacillus sp., evaluando condiciones operacionales correspondientes al tipo de cultivo (monocultivo y co-cultivo), sustrato (fresco y desproteinizado), tasa de dilucion y agitacion. Posteriormente, fue verificada la cinetica de crecimiento y produccion de biomasa y de acido lactico a una escala de 20L, en un sistema operado en regimen discontinuo. Las mejores condiciones de crecimiento fueron obtenidas empleando LD fresco diluido, co-cultivo y agitacion intermitente a 60 r.p.m. El esca...
The present work reports on the development and the experimental results of the investigation wit... more The present work reports on the development and the experimental results of the investigation with a CO2 laser excited by a capacitive radio frequency discharge. In a gas mixture composed by carbon dioxide, nitrogen and helium, in the proportions of 1:10.2:11.5 respectively. The system has a gas closed network of pipe with 7.6 cm internal diameter and a length of 5.5 m. The system uses a roots pump for the gas circulation. The gas flow in the discharge chamber is parallel to the optical axis and it has an approximate speed of 75 m/s. The gas mixture is maintained at temperatures between 14 to 18 °C. The radio frequency source can deliver up to 5 kW rms. The discharge chamber has aluminum electrodes attached externally with ceramic to a boro-silicate tube of 2.5 cm of diameter. The electrodes are 0.5 cm width and a 10 cm long. The obtained discharge is traverse to the gas flow and to the optical axis of the resonator, which are parallels. The optic resonator is composed by a back sph...
Universal screening is a proactive method for identifying student risk, yet remains under-utilize... more Universal screening is a proactive method for identifying student risk, yet remains under-utilized in school systems. Instead, many schools rely on teacher reports and referrals without accounting for different informant perspectives. In the current study, multi-informant universal screening in evaluated using a trifactor model. The study utilized the Social, Academic, and Emotional Behavior Risk Screener (SAEBRS), specifically the teacher (SAEBRS-TRS) and student (mySAEBRS) self-report forms, with items indicating risk for social, academic, and emotional behavior. Data from a national sample of over 24,000 K-12 teacher-student dyads were used to examine the extent and variance of discrepant reports between students and teachers of common, perspective, and item factors. Results demonstrated that informant perspective factors were a strong predictor for student and teacher emotional behavior item ratings. Whereas age had a positive effect on younger student reports of risk on the behavior items compared to older student reports, teachers showed the opposite effect. The teacherperspective of social and emotional behaviors of students was predicted by gender. Implications and directions for future research are further discussed.
Este libro recoge los frutos de la colaboración y trabajo conjunto de un grupo de Universidades I... more Este libro recoge los frutos de la colaboración y trabajo conjunto de un grupo de Universidades Iberoamericanas entre 2007 y 2012 el marco de las actividades del Programa de Cooperación Comunidad, Agua y Bosque en Centroamérica (CAB ...
We present a case of a 32-year-old female patient with the diagnosis of gallstone disease and cho... more We present a case of a 32-year-old female patient with the diagnosis of gallstone disease and choledocholithiasis. Prior to in vivo surgery, we practiced the critical steps of the procedure using a proposed inert training model. We performed a robot-assisted laparoscopic common bile duct exploration, obtaining one stone. The operating time was 140 min (console time: 120 min) with no complications during the procedure. The patient was discharged 2 days after the operation. Robot-assisted minimally invasive surgery of the common bile duct is a safe and effective procedure and seems to have some benefits over conventional laparoscopic surgery.
El objetivo es analizar la percepción de los turistas de negocios respecto a la responsabilidad s... more El objetivo es analizar la percepción de los turistas de negocios respecto a la responsabilidad social empresarial (RSE) y consumo responsable (CR), identificando la asociación entre estas variables. Método: Se trata de una investigación cuantitativa, empleando pruebas estadísticas T-student, ANOVA y correlaciones para la comprobación de hipótesis. Resultados: Se evidencia que entre la RSE y la CR existen asociaciones significativas y positivas, denotando la importancia de la interacción con el cliente para dar a conocer las prácticas de RSE. Limitaciones del estudio: La naturaleza transversal y el tamaño de la muestra. Originalidad: El estudio es relevante para el sector turístico como estrategia de RSE para atraer clientes con demandas alineadas por el CR. Hallazgos: La edad de los turistas y la categoría del hotel influyen en la percepción sobre la RSE y el CR, al encontrar que entre más jóvenes y mayor sea la categoría del hotel mejor se aprecia las variables.
Uploads
Papers by Alexis Sanchez