Aritmética maya: un aporte al currículo

La Aritmética Maya forma parte desde hace pocos años del Currículo Nacional Base de Guatemala como una respuesta a las demandas sociales para la construcción de un país incluyente donde la variedad de culturas se conciba y viva como una riqueza y no como una dificultad. El presente artículo facilita que el adulto inicie su conocimiento de Aritmética Maya tal como se inician los niños y las niñas actualmente en Guatemala utilizando semillas y palitos (pequeñas ramas) para leer, escribir y realizar operaciones básicas. Además, ofrece la posibilidad de comprender y apreciar las relaciones entre la numeración, los distintos calendarios y la visión de la naturaleza y la vida de los Pueblos mayas actuales herederos de los grandes astrónomos y sabios de la antigüedad

Parallel Graph Transformation for Model Simulation applied to Timed Transition Petri Nets

Proceedings of the Workshop on Graph Transformation and Visual Modelling Techniques (GT-VMT 2004)This work discusses the use of parallel graph transformation systems for (multi-formalism) modeling and simulation and their implementation in the meta-modeling tool AToM3. As an example, a simulator for Timed Transition Petri Nets (TTPN) is modeled using parallel graph transformation.This work has been partially sponsored by the SEGRAVIS network and the Spanish Ministry of Science and Technology (TIC2002-01948)

Collaboration Two-Way: Workload and Co-ownership in L2 Wiki Writing

Collaborative writing has been found to lead to more productive writing processes and enhanced final products in terms of a richer vocabulary, more accurate grammar, and better organization. The present study expands on this research strand by exploring if different group writing processes affect the quality of wiki texts composed by groups of intermediate German L2 learners. Defining true collaborative writing as involving both a balanced workload and a joint responsibility for the product from all group members, it measured collaboration in two ways. Results indicate that most of the 19 groups in this study had a somewhat unbalanced workload with wide variability in editing group members’ contributions. Although the wiki texts differed greatly with regard to quantitative measures of length, accuracy and cohesion, no correlation was found in terms of workload or co-ownership. While holistic ratings of the texts concerning accuracy and cohesion seemed at times incongruent with the analytic measures, the raters’ comments provided a perspective that captured facets and nuances of a text that the analytic indicators did not

Effect of diets supplemented with different conjugated linoleic acid (CLA) isomers on protein expression in C57/BL6 mice

The individual genetic variations, as a response to diet, have recently caught the attention of several researchers. In addition, there is also a trend to assume food containing beneficial substances, or to supplement food with specific compounds. Among these, there is the conjugated linoleic acid (CLA), which has been demonstrated to reduce fat mass and to increase lean mass, even though its mechanism of action is still not known. We investigated the effect of CLA isomers (CLA c9,t11 and CLA t10,c12) on the proteomic profile of liver, adipose tissue, and muscle of mouse, with the aim of verifying the presence of a modification in fat and lean mass, and to explore the mechanism of action

Developmental and functional effects of steroid hormones on the neuroendocrine axis and spinal cord

This review highlights the principal effects of steroid hormones at central and peripheral levels in the neuroendocrine axis. The data discussed highlight the principal role of oestrogens and testosterone in hormonal programming in relation to sexual orientation, reproductive and metabolic programming, and the neuroendocrine mechanism involved in the development of polycystic ovary syndrome phenotype. Moreover, consistent with the wide range of processes in which steroid hormones take part, we discuss the protective effects of progesterone on neurodegenerative disease and the signalling mechanism involved in the genesis of oestrogen-induced pituitary prolactinomas.Fil: Zubeldia Brenner, Lautaro. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; ArgentinaFil: Roselli, C. E.. Oregon Health and Science University Portland; Estados UnidosFil: Recabarren, S. E.. Universidad de Concepción; ChileFil: Gonzalez Deniselle, Maria Claudia. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental. Fundación de Instituto de Biología y Medicina Experimental. Instituto de Biología y Medicina Experimental; ArgentinaFil: Lara, H. E.. Universidad de Chile; Chil

La tributación agricola en Chile

82 p.El objetivo general del estudio es conocer, recopilar y analizar el marco jurídico y las tendencias jurisprudenciales que se aplican en el sector agrícola; para lo anterior se procedió a recopilar normas y decretos vigentes al año 2002, asi como también circulares y resoluciones del Servicio de Impuestos Internos y su aplicación práctica, sentencias judiciales y administrativas desde el año 1987 al año 2003. Esto llevó a analizar cuál o cuáles eran los problemas que se daban con mayor frecuencia tanto en el Servicio de Impuestos Internos como en los tribunales. La metodología empleada fue básicamente documental. Los resultados del estudio son una categorización de los problemas con mayor frecuencia, y análisis de las normas vigentes y de la jurisprudencia administrativa y judicial