El contrato de prestación de servicios y el principio de estabilidad laboral constitucional en Colombia

Artículo de ReflexiónAnálisis crítico y jurídico, sobre el uso del contrato de prestación de servicios por parte de las empresas públicas y privadas del país y el principio de estabilidad constitucional de 1991, ademas ser un documento de consulta en el contexto de desmejoramiento de condiciones para el empleado en material laboral y tener una comprensión integral de las causas y consecuencias.1. La Estabilidad Laboral en Colombia. 2. El contrato de trabajo en Colombia. 3. Contrato de prestación de servicios en sector Privado. 4. Contrato de prestación de servicios en el sector público 5. Conclusiones.PregradoAbogad

Isidora Aguirre y la reconstrucción de la historia en Lautaro

Isidora Aguirre y la reconstrucción de la historia en Lautar

Jairo Aníbal Niño: Un dramaturgo colombiano

Jairo Aníbal Niño: Un dramaturgo colombian

COLOMBIA: El IV Festival del Nuevo Teatro

COLOMBIA: El IV Festival del Nuevo Teatr

El gobierno corporativo en el Brasil y el papel social de las empresas.

El artículo tiene como objetivo realizarun análisis del tema gobierno corporativoa partir de la tendencia seguidaen los últimos años, por la gerenciade las empresas, a no sólo discutiry presentar el análisis de variablesfinancieras, económicas o demercadeo en sus informes financieros,sino que también comienza atener peso, en estos informes el análisisy discusión de variables de caráctersocial, como por ejemplo aquellasrelacionadas con el medio ambiente,los recursos humanos, y todaslas acciones orientadas a la proteccióndel accionista minoritario.Igualmente, en el artículo se presentael caso de Brasil, donde en los últimosaños ha surgido una serie denuevos informes, por medio de loscuales se espera pasar una mayorcantidad de información a los usuariosy de la misma forma fue creadoun nuevo índice en la bolsa de valoresde São Paulo, conocido como IGC(Índice de Gobierno Corporativo).Todas estas novedades no tienen otrofin que el dar herramientas objetivasy crear un ambiente de total transparenciay confiabilidad para que elpotencial inversionista tome la mejordecisión.

Residual effect of natural and synthetic zinc chelates on zinc in a soil solution of a waterlogged acidic soil. Evolution of the pH and redox potential.

Zinc chelates have been widely used to correct deficiencies in this micronutrient in different soil types and under different moisture conditions. The aging of the metal in soil could cause a change in its availability. Over time the most labile forms of Zn could decrease in activity and extractability and change to more stable forms. Various soil parameters, such as redox conditions, time, soil type and moisture conditions, affect the aging process and modify the solubility of the metal. In general, redox conditions influence pH and also the chemical forms dissolved in the soil solution. Soil pH also affects Zn solubility; at high pH values, most of the Zn is present in forms that are not bioavailable to plants. The objective of this study was to determine the changes in Zn over time in a soil solution in a waterlogged acidic soil to which synthetic and natural chelates were applie

Neuropathological events in an animal model resembling human fetal post-hemorrhagic hydrocephalus

Introduction: In premature newborns, intraventricular hemorrhages (IVH) probably trigger the disruption of the neurogenic ventricular zone. Most of the cases with severe IVH develop post-hemorrhagic hydrocephalus (PHH). A mouse model with IVH has been developed to research into the common neuropathological events present in PHH and into possible therapies. Methods: In two-day-old mice, the blood serum from littermates was injected into the ganglionic eminence of one hemisphere or both hemispheres. Fourteen days later, a histopathological analysis was carried out. In the case of injection in one hemisphere, the effects were compared with the contralateral non-injected hemisphere. Results: Mice with IVH developed the following neuropathological effects. The ependyma was found denuded and replaced by reactive astrocytes. A reaction of astrocytes over-expressing aquaporin-4 and of NG2 cells was also found developed in the white matter. Alterations in the neurogenesis were also common in the ventricular zone and in the white matter. Conclusions: The animal model of IVH developed shows similar neuropathological events to other forms of congenital hydrocephalus and can be used to research into therapies for PHH.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. PI15/0619 (ISCIII/FEDER) to AJJ

Neural activity control of neural stem cells and SVZ niche response to brain injury

Patricia Paez-Gonzalez Kuo Lab, Dept. of Cell Biology, Duke University Medical Center, NC,USA. Date: 11/16/2014 Utilizing stem cells in the adult brain hold great promise for regenerative medicine. Harnessing ability of adult neural stem cells (NSCs) to generate new neurons or other types of brain cells may provide much needed therapies for patients suffering from brain injuries or neuro-degenerative diseases such as Parkinson’s, Scizophrenia, or Alzheimer’s disease. However, the treatments that involve stem cells are based in NSC transplantation and its efficiency is really low. The major barriers-to-progress in this area of research are immune-rejection of the implanted cells, faulty tumorogenic growth, but mainly, a faulty integration of the improper progeny. To avoid the problems that accompany NSC transplantation, we wanted to explore whether a new approach focused on “modulating” the brain’s own resident stem cells to produce the appropriate cells after brain damage was possible. In order to determine if “in situ” stem cell therapy was plausible, we first had to determine whether 1) Environment provides the right signals for the proper NSC function and generation of the appropriate progeny, 2) whether in vivo NCSs are capable to elaborate an appropriate response under different brain requirements, and 3) whether directed modulation of Neural Stem Cells function is possible. We found that using genetic alteration in only the neighboring ependymal cells has the profound impact of nearly eliminating new neuron production in the lateral ventricular neurogenic region. Secondly, we determined that cortical strokes that do not impact the neurogenic region induce production on TSP4+ astrocytes that migrate to the injury site to produce the scar that stops cortical bleeding. Thirdly, we have identified a novel cholinergic circuit that resides in the neurogenic region, and that optogenetic stimulation or silencing of acetylcholine neurons can robustly up or down-regulate new neuron production. These three discoveries have met the required conditions for using intrinsic NSCs as therapy for brain regeneration and repair. I am now extending this line of research to determine if this therapy is now a feasible technique for brain repair understanding how the local brain circuits are modified as the NSCs transition to an injury response and back to normal production following recovery. Together these data suggest that therapies utilizing the bodies own intrinsic control mechanisms for NSC regulation may soon provide much needed avenues for future therapies that are unattainable with other methods.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Percepciones de la Sierra Maestra. La visión de la insurrección cubana (1957-1958) a través de los periodistas latinoamericanos

La insurrección cubana tuvo una abrumadora cobertura de prensa desde los primeros compases del levantamiento en contra del gobierno de Batista, que condicionaría en parte las oportunidades políticas y las estructuras de movilización concurrentes en el conflicto. El trabajo realizado por los primeros hombres de la prensa, fundamentalmente estadounidenses, que se entrevistaron con los líderes rebeldes cubanos sirvió como reclamo a otros muchos periodistas interesados en comprobar in situ el devenir de los acontecimientos. Ese fue el caso de los reporteros llegados desde varios países latinoamericanos, atraídos por el ideario de liberación propugnado desde las montañas cubanas. Periodistas provenientes de Ecuador, Argentina, México, Uruguay y Venezuela difundieron al resto del continente sus pareceres sobre lo que estaba aconteciendo en Cuba, ofreciendo una visión personal de un proceso que marcaría el devenir sudamericano a partir de la década de los sesenta.The Cuban insurrection had an overwhelming press coverage from the early stages of the uprising against the Batista government, which would determine in part the political opportunities and structures of mobilization concurrent in the conflict. The work done by the first men of the press, mainly Americans, served as a lure to many journalists interested in checking in situ the course of the events. That was the case of the reporters who came from several Latin American countries, attracted by the ideas of liberation coming from the Cuban mountains. Journalists from Ecuador, Argentina, Mexico, Uruguay and Venezuela spread to the rest of the continent their views on what was happening in Cuba, offering a personal view of a process that would mark the Latinamerican evolution from the sixties

La educación femenina en Roma : rompiendo tópicos

El estudio de la educación femenina en el mundo romano ha hecho correr ríos de tinta, intentando exprimir las fuentes, que se muestran parcas en referencias al sistema educativo en general. Sin embargo, este trabajo se ha visto marcado, en muchas ocasiones, por los tópicos referentes a la teoría de las esferas, la domesticidad femenina y una supuesta falta de agencia de las mujeres. Por el contrario, el acercamiento a las fuentes epigráficas, iconográficas, arqueológicas o a referencias que han pasado más o menos desapercibidas, permiten crear un marco mucho más complejo, en que las mujeres tenían acceso a la educación y podían llegar a ser consideradas una fuente de autoridad importante.The study of female education in the Roman world has poured out rivers of ink, trying to squeeze the sources, that have proven to be lacking in references to the educational system as a whole. Nonetheless, this work has been marked, in many occasions, by clichés referring to the separate spheres theory, female domesticity and an alleged lack of female agency. On the contrary, the approach to epigraphic, iconographic, archaeological sources, or to relatively unnoticed literary references, allow us to create a much more complex framework, in which women had access to education and could get to be considered a strong source of authority