Gestión institucional y toma de decisiones en la institución educativa N° 0027 San Antonio de Jicamarca del distrito de Lurigancho 2017

La tesis de investigación que se presenta tiene como objetivo general determinar la relación que existe entre la gestión institucional y la toma de decisiones, y así probar la importancia que tiene la relación de estos términos para el desarrollo institucional. Para esta investigación se utilizó un diseño descriptivo correlacional. En el cual se consideró como muestra un total de 60 docentes de la IE 0027 San Antonio de Jicamarca del distrito de Lurigancho a quienes se les aplicó una encuesta para recoger y conocer sus percepciones respecto a las variables mencionadas arriba. Los resultados del estudio estadístico demuestran que el valor es menor que 0.05 entonces se rechaza la hipótesis nula y se concluye que existe una relación significativa entre gestión institucional y toma de decisiones de la institución educativa N° 0027 “San Antonio de Jicamarca” del distrito de Lurigancho 2017, Así mismo, existe una relación significativa entre las dimensiones (planeación, organización, dirección y control) con la toma de decisiones, comprobándose así las hipótesis formulada

Assessment of habitat quality and landscape connectivity for forest-dependent cracids in the Sierra Madre del Sur Mesoamerican biological corridor, Mexico

Assessing landscape connectivity allows us to identify critical areas that impede or facilitate the movement of organisms and their genes and to plan their conservation and management. In this article, we assessed landscape connectivity and ecological condition of the habitat patches of a highly biodiverse region in Chiapas, Mexico. We employed data of three cracid species with different characteristics in habitat use and mobility. The habitat map of each species was derived from a spatial intersection of the models of potential distribution and a high-resolution map of current land cover and land use. The ecological condition of vegetation types was evaluated using 75 field plots. Structure of landscape was estimated by fragmentation metrics, while functional connectivity was assessed using spatially explicit graph analysis. The extent of suitable habitat for Oreophasis derbianus, Penelopina nigra, and Penelope purpurascens correspond to 25%, 46%, and 55% of the study area (5,185.6 km2), respectively. Although the pine-oak forests were the most fragmented vegetation type, habitats of the three species were well connected, and only 4% to 9% of the fragments located on the periphery of the corridor had low connectivity. Landscape connectivity depends mainly on land uses with an intermediate and lower ecological condition (secondary forests and coffee agroforestry systems). Therefore, we suggest that in addition to promoting the improvement in connectivity in fragmented forests, conservation efforts should be aimed at preventing the conversion of mature forests into agricultural uses and maintaining agroforestry systems

Horizontal gene transfer and diverse functional constrains within a common replication-partitioning system in Alphaproteobacteria: the repABC operon

<p>Abstract</p> <p>Background</p> <p>The <it>repABC </it>plasmid family, which is extensively present within <it>Alphaproteobacteria</it>, and some secondary chromosomes of the <it>Rhizobiales </it>have the particular feature that all the elements involved in replication and partitioning reside within one transcriptional unit, the <it>repABC </it>operon. Given the functional interactions among the elements of the <it>repABC </it>operon, and the fact that they all reside in the same operon, a common evolutionary history would be expected if the entire operon had been horizontally transferred. Here, we tested whether there is a common evolutionary history within the <it>repABC </it>operon. We further examined different incompatibility groups in terms of their differentiation and degree of adaptation to their host.</p> <p>Results</p> <p>We did not find a single evolutionary history within the <it>repABC </it>operon. Each protein had a particular phylogeny, horizontal gene transfer events of the individual genes within the operon were detected, and different functional constraints were found within and between the Rep proteins. When different <it>repABC </it>operons coexisted in the same genome, they were well differentiated from one another. Finally, we found different levels of adaptation to the host genome within and between <it>repABC </it>operons coexisting in the same species.</p> <p>Conclusion</p> <p>Horizontal gene transfer with conservation of the <it>repABC </it>operon structure provides a highly dynamic operon in which each member of this operon has its own evolutionary dynamics. In addition, it seems that different incompatibility groups present in the same species have different degrees of adaptation to their host genomes, in proportion to the amount of time the incompatibility group has coexisted with the host genome.</p

Cambio de uso del suelo en la cuenca del río Sabinal, Chiapas, México/Land-use change in the Sabinal river watershed, Chiapas, Mexico

. Con el propósito de conocer que los factores promueven el cambio en la cobertura del suelo en la cuenca del río Sabinal, Chiapas, este trabajo analiza la relación entre mapas de cambio en la cobertura del suelo y estadísticas socioeconómicas. Se elaboraron mapas de la cobertura del suelo de 1992 y 2009 con imágenes satelitales de alta resolución; también se colectaron y analizaron datos socioeconómicos relacionados con el uso del suelo. La comparación de los mapas muestra que la tasa de deforestación es del 0.5 %, la cual es más baja que la reportada en otras zonas de bosque tropical seco; la población rural se ha mantenido a niveles similares de 1990, pero la población urbana creció más del doble. La supercie promedio de potreros por productor se ha duplicado, pero la de cultivos se mantiene similar a 1992, ya que los campesinos prerieron sistemas de producción extensivos. Los terrenos agrícolas han disminuido en extensión y se han desplazado a zonas de mayor pendiente debido a la expansión de las áreas urbanas. Se encontró una alta dependencia de insumos de otras regiones del país, pero la producción de alimentos básicos en la cuenca se ha mantenido a niveles de 1991

How effective are biodiversity conservation payments in Mexico?

We assess the additional forest cover protected by 13 rural communities located in the southern state of Chiapas, Mexico, as a result of the economic incentives received through the country's national program of payments for biodiversity conservation. We use spatially explicit data at the intra-community level to define a credible counterfactual of conservation outcomes.We use covariate-matching specifications associated with spatially explicit variables and difference-in-difference estimators to determine the treatment effect. We estimate that the additional conservation represents between 12 and 14.7 percent of forest area enrolled in the program in comparison to control areas. Despite this high degree of additionality, we also observe lack of compliance in some plots participating in the PES program. This lack of compliance casts doubt on the ability of payments alone to guarantee long-term additionality in context of high deforestation rates, even with an augmented program budget or extension of participation to communities not yet enrolled. (Résumé d'auteur

Elementos sobre la historia del concepto de desarrollo según los economistas Theotonio Dos Santos y Gilbert Rist.

El artículo tiene como propósito presentar la percepción y las inquietudes que dos importantes pensadores económicos ofrecen a través de sus obras sobre dependencia económica y desarrollo, como punto de partida en la reflexión que se ha iniciado sobre algunos conceptos que se convierten en clave para una discusión o debate. El estudio de una de las obras de Theotonio Dos Santos y otra de Gilbert Rist sobre la temática mencionada, le deja al grupo de investigación importantes inquietudes para la construcción de un pensamiento propio y alternativo

Using satellite estimates of aboveground biomass to assess carbon stocks in a mixed-management, semi-deciduous tropical forest in the Yucatan Peninsula

Information on the spatial distribution of forest aboveground biomass (AGB) and its uncertainty is important to evaluate management and conservation policies in tropical forests. However, the scarcity of field data and robust protocols to propagate uncertainty prevent a robust estimation through remote sensing. We upscaled AGB from field data to LiDAR, and to landscape scale using Sentinel-2 and ALOS-PALSAR through machine learning, propagated uncertainty using a Monte Carlo framework and explored the relative contributions of each sensor. Sentinel-2 outperformed ALOS-PALSAR (R2 = 0.66, vs 0.50), however, the combination provided the best fit (R2 = 0.70). The combined model explained 49% of the variation comparing against plots within the calibration area, and 17% outside, however, 94% of observations outside calibration area fell within the 95% confidence intervals. Finally, we partitioned the distribution of AGB in different management and conservation categories for evaluating the potential of different strategies for conserving carbon stock

Osteosarcoma extraesquelético. Presentación de un caso

El osteosarcoma extraesquelético es un tumor maligno de alto grado que representa menos del 2% de los sarcomas de partes blandas y que afecta principalmente a personas entre la quinta y sexta década de la vida. Típicamente el diagnóstico es tardío, con un período síntomas-diagnóstico extenso, >6 meses en comparación con el del osteosarcoma convencional. Comunicamos el caso de un hombre de 43 años que acudió con una tumoración en la región glútea y el muslo izquierdo de un año de evolución. Luego de estudios complementarios y una biopsia no concluyentes, se procedió a la resección quirúrgica del tumor con márgenes amplios. El estudio histológico de la pieza indicó osteosarcoma extraesquelético. El paciente tuvo una evolución muy buena, sin elementos de recidiva local ni compromiso a distancia luego de 20 meses de seguimiento

Complete Genome Sequence of a bla OXA-58 -Producing Acinetobacter baumannii Strain Isolated from a Mexican Hospital

ABSTRACT In this study, we present the complete genome sequence of a blaOXA-58- producing Acinetobacter baumannii strain, sampled from a Mexican hospital and not related to the international clone