Análisis de la implementación de la responsabilidad social empresarial mediante el modelo de negocio inclusivo en Colombia

El objetivo de este ensayo es analizar el alcance de la implementación de la Responsabilidad Social Empresarial en Colombia bajo el modelo de Negocio Inclusivo mediante el estudio de prácticas empresariales.Pregrad

Youth in livestock, the engine for change: strategic partnerships with a private company (CIAT/CCAFS-Alqueria): The beginnings, incentives, and objectives of the Herederos de Tradición (Heirs of Tradition) initiative carried out by Alquería’s farmer training programs.

In 2012, the private dairy company Alquería launched its first pilot training program for small-scale milk producers, MACA. The name MACA derives from the pilot’s initial test region in the municipalities near the Macarena mountain range in El Meta, Colombia. This particular area has been identified for the urgent need to tackle the low rates of schooling of its producers, and the need for a technification of the livestock farms to increase their productivity and, in turn, the quality of life of their managers. En el año 2012, la empresa privada de lácteos Alquería lanzó su primer programa piloto de capacitación a pequeños productores de leche: MACA. Así se le bautizó en ese momento pues la zona de prueba inicial del piloto fue en los municipios cercanos a la serranía de la Macarena en el Meta, Colombia; respondiendo a lo que se venía identificando como una necesidad urgente en esa zona en particular, el atajar los bajos índices de escolaridad de los productores e impulsar la tecnificación de los predios ganaderos con el ánimo de incrementar su productividad y, con esta, la calidad de vida de quienes los administran

Optimizing a Simple Natural Dye Production Method for Dye-Sensitized Solar Cells: Examples for Betalain (Bougainvillea and Beetroot Extracts) and Anthocyanin Dyes

We present a study about the sensitizers extracted from natural resources. This paper focuses on how to select, extract and characterize natural dyes, giving some guides to establish a protocol for the whole process of fabricating and using these dyes. The influence of the extraction solvent and method, and of parameters such as pH are analyzed. Also, dye precursor and dye extract stability have been studied, as well as how the dye adsorbs onto substrates and the effect of mixing or concentrating the extracts. Results concerning betalain pigments present in bougainvillea and beetroot extracts, and anthocyanins in eggplant extracts, analyzed by using UV-Vis spectrometry, are included. As an example of application, we report procedures intended to test and enhance the dye potential as a main component of dye-sensitized solar cells (DSSCs). DSSCs mimic nature’s photosynthesis and have some advantages like an easy and low-cost fabrication procedure. Their efficiency depends on its design and fabrication process and also on the different components involved. Hence, optimizing each component is essential to achieve the best performance, and thus the dye used as a sensitizer is crucial. We fabricate cells by using a simple procedure: As the interest is focused on the sensitizer, the same consecutive steps are followed, varying only the dye extract. Among all the natural-dyes tested, beetroot extract reaches up to 0.47% cell efficiency, which is near the highest values found in literature for this pigment

La Enseñanza y el aprendizaje de la química en el contexto de un currículo articulado desde concepciones científicas de interacción

En el presente trabajo se muestra la construcción, desarrollo y aplicación de unidades didácticas innovadoras abordando conceptos estructurantes como naturaleza corpuscular de la materia, cambio químico y cuantificación de relaciones, orientadas por un eje didáctico de resolución de problemas teniendo en cuenta los estándares curriculares nacionales y concepciones científicas de interacción. Las unidades didácticas derivadas de la conjugación de estas perspectivas científicas y educativas fueron aplicadas con estudiantes de educación media de varios Colegios de la ciudad de Bogotá

The Asymptotic Behavior of the Composition of Firmly Nonexpansive Mappings

In this paper we provide a unified treatment of some convex minimization problems, which allows for a better understanding and, in some cases, improvement of results in this direction proved recently in spaces of curvature bounded above. For this purpose, we analyze the asymptotic behavior of compositions of finitely many firmly nonexpansive mappings in the setting of $p$-uniformly convex geodesic spaces focusing on asymptotic regularity and convergence results

Calibrated forceps model of spinal cord compression injury.

Compression injuries of the murine spinal cord are valuable animal models for the study of spinal cord injury (SCI) and spinal regenerative therapy. The calibrated forceps model of compression injury is a convenient, low cost, and very reproducible animal model for SCI. We used a pair of modified forceps in accordance with the method published by Plemel et al. (2008) to laterally compress the spinal cord to a distance of 0.35 mm. In this video, we will demonstrate a dorsal laminectomy to expose the spinal cord, followed by compression of the spinal cord with the modified forceps. In the video, we will also address issues related to the care of paraplegic laboratory animals. This injury model produces mice that exhibit impairment in sensation, as well as impaired hindlimb locomotor function. Furthermore, this method of injury produces consistent aberrations in the pathology of the SCI, as determined by immunohistochemical methods. After watching this video, viewers should be able to determine the necessary supplies and methods for producing SCI of various severities in the mouse for studies on SCI and/or treatments designed to mitigate impairment after injury