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Search Results: 1 - 10 of 741482 matches for " Andrés A.; Vásquez-Trespalacios "
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Mobbing, un aspecto a vigilar en los profesionales en Colombia
Martínez-Herrera,Eliana; Agudelo-Suárez,Andrés A.; Vásquez-Trespalacios,Elsa María;
Revista Gerencia y Políticas de Salud , 2010,
Abstract: this article recognizes the importance of strengthening the knowledge on the working environment -from the dimension and perspective of the workers--and the identification of its determiners. from there, mobbing has become a relevant public health issue, because it eases the generation of social and institutional information. literature and current legislation reviews about mobbing were conducted for its elaboration. within this research, the role of an instrument that defines intervention actions is highlighted for incorporating strategies to access information and make decisions in relation to social-sanitary policies and the aspects related to their development. it is consigned that mobbing has to be closely related to equity in health to be approached, and it is possible to intervene problems affecting economic development in order to improve the quality of life of workers and their relationship with the working environment, through the rational use of the evidence available.
Absentismo laboral por causa médica en trabajadores del área operativa de una compa ía de extracción de minerales en Colombia, 2011 Sickness absence in workers from an operating area of a mining company in Colombia, 2011
Elsa María Vásquez Trespalacios
Medicina y Seguridad del Trabajo , 2013,
Abstract: Introducción: El sector minero es uno de los más dinámicos de la economía en Colombia, sin embargo, poco se conoce acerca del ausentismo laboral que enfrenta. Objetivo: Describir la magnitud del ausentismo laboral por causa médica en el área operativa de una empresa minera Colombiana, durante el a o 2011. Material y métodos: estudio descriptivo, transversal, en el que se analizaron 130 ausencias por causa médica. Los episodios se categorizaron según grupos diagnósticos de la Clasificación Internacional de Enfermedades versión 10 (CIE-10) y se calcularon indicadores de ausentismo. Resultados y discusión: 66.9% de las ausencias se debió a enfermedad general y el 33.3% a accidentes de trabajo. El promedio de ausencia es de 4.28 +/-5.64 días por trabajador. Las enfermedades musculoesqueléticas y los traumatismos y envenenamientos tuvieron los mayores días de ausencia, similar a lo reportado por otros investigadores. Los accidentes de trabajo generaron 315 días de ausencia. 19 ausentistas repetitivos aportaron en total 100 días perdidos. La edad promedio de los ausentistas repetitivos es de 28.6 a os+/-6.7. Los ausentistas crónicos generaron una pérdida de 258 días por cada 100 trabajadores programados. Introduction: The mining sector is one of the most dynamic in Colombian economy, however, little is known about absenteeism. Aim: To describe the extent of sickness absence in an operating area of a mining company in Colombia, in 2011. Material and Methods: A descriptive, cross-sectional study, which analyzed 130 sickness absences. The episodes were categorized according to diagnostic groups of the International Classification of Diseases version 10 (ICD-10) and calculated rates of absenteeism. Results and discussion: 66.9% of absences were due to general illness and 33.3% of accidents at work. The average absence is 4.28 +/-5.64 days per worker. Most of absence days were generated by musculoskeletal diseases and injuries and poisoning, similar to that reported by others. Work accidents generated 315 days of absence. 19 repetitive absentee contributed a total of 100 lost days. The average age of a repetitive absentee is 28.6 years +/-6.7. The chronic absentee generated a loss of 258 days per 100 scheduled workers.
AGENCIAS DE VIAJES: NUEVOS RETOS EN LA INDUSTRIA DEL TURISMO
VELáSQUEZ VáSQUEZ,FRANCISCO; PE?A,JOSé RAMóN; MACíA,ANDRéS FELIPE;
Estudios Gerenciales , 2005,
Abstract: this paper discusses the case of a recent graduate from a specialized business administration program who joins a family business engaged in the dynamic tourism industry. it shows how this industry is affected by multiple socieconomic factors such as the purchasing power of society, different cultures and concepts of tourism, violence, and the current globalization trend that constantly drives suppliers of goods and services to establish strategic alliances with other stakeholders in the chain of value in one or several industry segments not only to reduce costs, but also to be more competitive and attractive to customers. the new graduate needs to identify the new role of travel agencies within the chain of value in the tourism industry in order to turn his small travel agency into viable sustainable business on a long-term basis.
Agencias de viajes: nuevos retos en la industria del turismo
Francisco Velásquez Vásquez,José Ramón Pe?a,Andrés Felipe Macia
Estudios Gerenciales , 2005,
Abstract:
El Ensayo Cometa: una técnica para evaluar genotoxicidad en el ADN de oocitos bovinos
Rodrigo A,Urrego; Pareja,Andrés; Vásquez,Neil A; Márquez,María E;
Revista Colombiana de Ciencias Pecuarias , 2005,
Abstract: the single cell gel electrophoresis or the comet assay is used to measure the dna damage of individual cells, for most studies the lymphocytes from peripheral blood are used as cellular model. however, during the last years, the application of this technique has been extended to the germinal cells with the purpose of evaluating the integrity of the spermatic dna, oxidative stress conditions in boar oocytes and bovine embryos besides cellular death in mouse embryos. applying the comet assay to a system such as the bovine oocytes it becomes indispensable to overcome two big structural barriers in the cumulus-oocyte-complex (coc): first, the degradation of the glycoproteins in the zona pellucida and second, the elimination of the flatten level of the haploid metaphase ii bovine oocyte genome. these obstacles do not allow an appropriate migration of the dna through the agarose gel. in this study it is demonstrated that the use of a lysis solution with proteinase k during 3 h and 10 min in electrophoretic running allows to obtain quantifiable comets of bovine oocytes matured in vitro, which can be used in genotoxic studies.
El Ensayo Cometa: una técnica para evaluar genotoxicidad en el ADN de oocitos bovinos The Comet Assay: a technic to evaluate genotoxicity in DNA bovine oocytes
Urrego Rodrigo A,Andrés Pareja,Neil A Vásquez,María E Márquez
Revista Colombiana de Ciencias Pecuarias , 2005,
Abstract: La electroforesis en gel de células individuales o Ensayo Cometa, es frecuentemente usada para medir el da o en el ADN de las células. En la mayoría de estudios, los linfocitos de sangre periférica son utilizados como modelo celular. Sin embargo, en los últimos a os, la aplicación de esta técnica se ha extendido a las células germinales, con el fin de evaluar la integridad del ADN espermático, las condiciones de estrés oxidativo en oocitos porcinos y en embriones bovinos; además, la muerte celular en embriones de ratón. Para la realización de la electroforesis de células individuales en un sistema como los oocitos bovinos se hace imprescindible superar dos grandes limitantes en la estructura complejo-cúmulo-oocito (CCOS): una, la degradación de las glicoproteínas de la zona pelúcida y dos, eliminar el nivel de compactación del genoma haploide bovino en metafase II. Dichas limitantes no permiten una migración adecuada del ADN dentro del gel de agarosa. En este estudio se demuestra que el uso de una solución de lisis con proteinasa K durante 3 h y 10 min de corrido electroforético, permite obtener cometas cuantificables de oocitos bovinos madurados in vitro que pueden ser utilizados en estudios genotóxicos en este sistema celular. The single cell gel electrophoresis or the comet assay is used to measure the DNA damage of individual cells, for most studies the lymphocytes from peripheral blood are used as cellular model. However, during the last years, the application of this technique has been extended to the germinal cells with the purpose of evaluating the integrity of the spermatic DNA, oxidative stress conditions in boar oocytes and bovine embryos besides cellular death in mouse embryos. Applying the comet assay to a system such as the bovine oocytes it becomes indispensable to overcome two big structural barriers in the cumulus-oocyte-complex (COC): first, the degradation of the glycoproteins in the zona pellucida and second, the elimination of the flatten level of the haploid metaphase II bovine oocyte genome. These obstacles do not allow an appropriate migration of the DNA through the agarose gel. In this study it is demonstrated that the use of a lysis solution with proteinase K during 3 h and 10 min in electrophoretic running allows to obtain quantifiable comets of bovine oocytes matured in vitro, which can be used in genotoxic studies.
MODELING OF DIRECT SOLAR RADIATION IN A COMPOUND PARABOLIC COLLECTOR (CPC) WITH THE RAY TRACING TECHNIQUE
JOSé A. COLINA MáRQUEZ,ANDRéS F. LóPEZ VáSQUEZ,FIDERMAN MACHUCA MARTíNEZ
DYNA , 2010,
Abstract: El colector parabólico compuesto (CPC) es una tecnología ampliamente usada en aplicaciones fotoquímicas, como las reacciones fotocatalíticas. Para propósitos cinéticos en esta clase de reacciones, se debe conocer la distribución de la radiación ya que la velocidad de reacción depende la absorción de fotones. En el presente trabajo desarrolló un modelo matemático que permitió simular el fenómeno de reflexión de la radiación solar directa en un CPC. Las ecuaciones se evaluaron usando geometría analítica y cálculo vectorial, primero para calcular las coordenadas cartesianas de la superficie reflectiva. Luego estos puntos se usaron para calcular las trayectorias de los rayos incidentes y reflejados en cualquier instante. La radiación incidente en el receptor se graficó independientemente, mostrando la distribución de la energía directa que llega directamente al absorbedor. La longitud de la involuta también se calculó a partir de estos datos, los cuales pueden resultar muy útiles para su construcción. Los resultados obtenidos a partir de las simulaciones muestran que la distribución de la energía incidente en la superficie del absorbedor depende de la reflectividad de la superficie del CPC. La energía incidente es mayor en la parte superior que en la inferior del absorbedor, y son más convenientes valores altos de reflectividad para distribuciones de energía más uniformes. Este modelo matemático puede ser una primera aproximación para modelos más complejos de absorción de fotones que incluyan radiación solar directa en aplicaciones fotoquímicas o fototérmicas.
Asociación entre títulos de anticuerpos anticardiolipinas y eventos trombóticos
Vanegas,Adriana Lucía; Díaz-Betancur,James; Arango Barrientos,Marcos; Velásquez,Germán Andrés; Toro,Juan Manuel; Vásquez,Gloria María;
Revista Colombiana de Reumatología , 2011,
Abstract: background: thrombosis is the main clinical manifestation of the antiphospholipid syndrome (aps); anticardiolipin antibodies (acl), anti-β2 glycoprotein-1 antibodies and lupus anticoagulant are the serological markers of the disease. whether the titles of acl or the presence of a "second hit" are risk factors for thrombosis is an unresolved issue. objective: to evaluate the association between vascular thrombotic events with the presence of acl. the relationship between thrombosis and the titles of acl, as well as other prothrombotic factors was also assessed. methodology: descriptive cross-sectional study. the clinical charts of patients with possible aps and at least one laboratory measurement of acl were reviewed. the presence of thrombotic events and the existence of comorbid states (second hit) were also evaluated. results: the records of 49 patients were assessed, 33 with a total of 36 thrombotic events, 23 had occurred on veins, and 13 on arteries. though the majority of the patients that had titles of acl above of 20 gpl or mpl were located in the group of thrombosis, there was no significant association between the titles of acl and the presence of thrombosis. neither significant association was found between thrombosis and the presence of other comorbid states. conclusions: these findings allow suggesting the increased frequency of thrombotic events in patients with titers of acl lower than 40 twice and also add information about the clinical characteristics of patients with acl and suspected aps in our region; however, they are not enough to categorize them as a definitive risk factor of thrombosis.
MULTIVARIABLE ANALYSIS OF 2,4-D HERBICIDE PHOTOCATALYTIC DEGRADATION
LóPEZ-VáSQUEZ,ANDRéS F; COLINA-MáRQUEZ,JOSé A.; MACHUCA-MARTíNEZ,FIDERMAN;
DYNA , 2011,
Abstract: the 2,4-d herbicide degradation of tio2 suspensions in tap water was evaluated under artificial irradiation conditions. the response surface methodology (rsm) was applied to evaluate the effect of variables such as: catalyst concentration, herbicide concentration, ph, and the volumetric flow on the photocatalytic reaction in two kinds of photoreactors: flat plate and tubular reactor. the response variable was the pesticide mineralization expressed as the total organic carbon (toc) removal percentage of the herbicide after four hours of irradiation. for the treatment carried out in the tubular reactor, the four effects had the same significance on the degradation; whereas for the flat plate reactor, the catalyst concentration and the ph were more significant. the results obtained suggest that the rsm is a suitable technique for obtaining optimal operating parameters of a photocatalytic process with a specific reactor and within a determined range of study.
MODELING OF DIRECT SOLAR RADIATION IN A COMPOUND PARABOLIC COLLECTOR (CPC) WITH THE RAY TRACING TECHNIQUE
COLINA-MáRQUEZ,JOSé A.; LóPEZ-VáSQUEZ,ANDRéS F.; MACHUCA-MARTíNEZ,FIDERMAN;
DYNA , 2010,
Abstract: the compound parabolic collector (cpc) is a widely used technology in photochemical applications, like photocatalytic reactions. for kinetic purposes in this kind of reaction, the radiation distribution has to be well known, since the reaction rate is strongly dependent on the photon absorption rate. the present work develops a mathematical model which allows simulating the reflection of direct solar radiation on a cpc. using analytical geometry and vector calculation, equations were evaluated, first for calculating the cartesian coordinates of the reflecting surface. later these points are used to calculate incident and reflected rays layouts on the collector. visual basic (excel environment) program was developed for data generation and plotting the reflected rays at any instant. the incident radiation on the receptor was plotted separately displaying the daily direct energy distribution in the absorber. also the involute length (collector) was calculated with these data, which can be very useful information for collector construction. results obtained after simulations show that the distribution of incident energy on the absorber surface depends on the surface reflectivity. the incident energy is larger at the top of the absorber than the bottom zone and it is more convenient higher surface reflectivities for more uniform energy distributions. this mathematical model can be a first approach for absorption models which include direct solar radiation in photochemical or photothermal applications.
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