The effects of GpcB1 locus on high grain protein concentration introgressed into Argentinean wheat germplasm Tabbita, Facundo; Lewis, Silvina Marta; Vouilloz, Juan P.; Ortega, María de los Ángeles Haydée; Kade, Mariana; Abbate, Pablo Eduardo; Barneix, Atilio José Wheat grain protein content (GPC) is important for human nutrition and
has a strong influence on the quality of pasta and bread. The objective of
this study was to analyse the introduction of the Gpc-B1 allele into two
Argentinean bread wheat cultivars. Near-isogenic lines were developed in
?ProINTA Oasis? and ?ProINTA Granar? using marker-assisted selection.
Gpc-B1 lines showed a significant (P = 0.01) increase in GPC and a significant
(P = 0.001) decrease in grain weight in comparison with control
lines without Gpc-B1. Differences in yield were not significant
(P = 0.49) between lines. Gpc-B1 lines significantly reduced (P = 0.02)
straw nitrogen concentration at maturity and significantly increased
(P = 0.02) the nitrogen harvest index. When data were analysed by genotype
and environment, differences in some analysed parameters were
found, indicating that Gpc-B1 expression may be affected by different
genetic backgrounds and environmental conditions. These results suggest
that the introgression of the Gpc-B1 allele into Argentinean wheat germplasm
could be a valuable resource for improving GPC with no detrimental
effect on grain yield.

Arsenic effect on the model crop symbiosis Bradyrhizobium–soybean Talano, Melina Andrea; Cejas, Romina Beatríz; González, Paola Solange; Agostini, Elizabeth Soybean (Glycine max) is often being cultivated in soils with moderate to high arsenic (As) concentrations or under irrigation with As contaminated groundwater. The purpose of this study was to determine the effect of As on soybean germination, development and nodulation in soybean-Bradyrhizobium japonicum E109 symbiosis, as a first-step approach to evaluate the impact of As on soybean production. Semi-hydroponic assays were conducted using soybean seedlings inoculated and non-inoculated with B. japonicum E109 and treated with arsenate or arsenite. Soybean germination and development, at early stage of growth, were significantly reduced from 10 μM arsenate or arsenite. This also was seen for soybean seedlings inoculated with B. japonicum mainly with arsenite where, in addition, the number of effective nodules was reduced, despite that the microorganism tolerated the metalloid. This minor nodulation could be due to a reduced motility (swarming and swimming) of the microorganism in presence of As. Arsenic concentration in roots was about 250-times higher than in shoots. Transference coefficient values indicated that As translocation to aerial parts was low and As accumulated mainly in roots, without significant differences between inoculated and non-inoculated plants. The presence of As restricted soybean–B. japonicum symbiosis and hence, the efficiency of most used commercial inoculants for soybean. Thus, water and/or soils containing As would negatively impact on soybean production, even in plants inoculated with B. japonicum E109.

Ecological Photodynamic Therapy: New trend to disrupt the intricate networks within tumor ecosystem Rumie Vittar, Natalia Belen; Lamberti, María Julia; Pansa, Maria Florencia; Vera, Renzo Emanuel; Rodriguez, Matias Exequiel; Cogno, Ingrid Sol; Milla Sanabria, Laura Natalia; Rivarola, Viviana As with natural ecosystems, species within the tumor microenvironment are connected by pairwise interactions (e.g. mutualism, predation) leading to a strong interdependence of different populations on each other. In this review we have identified the ecological roles played by each non-neoplastic population (macrophages, endothelial cells, fibroblasts) and other abiotic components (oxygen, extracellular matrix) directly involved with neoplastic development. A way to alter an ecosystem is to affect other species within the environment that are supporting the growth and survival of the species of interest, here the tumor cells; thus, some features of ecological systems could be exploited for cancer therapy. We propose a well-known antitumor therapy called photodynamic therapy (PDT) as a novel modulator of ecological interactions. We refer to this as “ecological photodynamic therapy.” The main goal of this new strategy is the improvement of therapeutic efficiency through the disruption of ecological networks with the aim of destroying the tumor ecosystem. It is therefore necessary to identify those interactions from which tumor cells get benefit and those by which it is impaired, and then design multitargeted combined photodynamic regimes in order to orchestrate non-neoplastic populations against their neoplastic counterpart. Thus, conceiving the tumor as an ecological system opens avenues for novel approaches on treatment strategies.

La Ciencia en los Cuentos: Análisis de las imágenes de científico en literatura juvenil de ficción; “Science in Tales”: Analysis of the Images of Scientist in Young People’s Fictional Literature Pujalte, Alejandro Patricio; Gangui, Alejandro; Aduriz Bravo, Agustin En el campo de los estudios referidos al carácter de las “imágenes de científico” presentes en la literatura de ficción, hemos puesto nuestro foco en una serie de cuentos producidos por estudiantes de escuela secundaria, con la intención de vincular algunos rasgos estereotípicos del científico especialmente frecuentes con los que subyacen a otras producciones culturales. Muchas de las representaciones son emergentes de una imagen de ciencia inadecuada desde el punto de vista de la enseñanza de las ciencias, pues se corresponde con un desinterés por las asignaturas científicas. Esto último, contribuiría a un estancamiento de la matrícula en las carreras de ciencia y tecnología en Iberoamérica en general y en especial en la Argentina; In the research field on the ‘images of scientists’ that appear in fictional literature, we focus on a set of tales produced by students of secondary school. Our aim is to connect some traits of the stereotypical scientist that appear in those texts with the traits underlying other cultural productions, since those productions may constitute the probable source of the stereotype. Many common representations of the scientist emerge from an image of science that is inadequate from the point of view of science teaching. It correlates to a lack of interest towards science courses. This lack of interest would contribute to stagnation in the number of students pursuing science and technology careers in Ibero-America in general and especially in Argentina.

Silsesquioxanes functionalized with one or two side-chain amino groups as coinitiators of camphorquinone in photoinitiated polymerization of methacrylate monomers Dell'erba, Ignacio Esteban; Asmussen, Silvana Valeria; Schroeder, Walter Fabian; Vallo, Claudia Ines Organotrialkoxysilanes (APS-PGE2) and (DAS-PGE3) were synthesized by reacting 1 mole of 3-(aminopropyl)triethoxysilane (APS) with 2 mole of phenylglycidylether (PGE) or 1 mole of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane (DAS) with 3 mole of PGE respectively. Polyhedral oligomeric silsesquioxanes functionalized with bulky amino groups (ASSQO) were prepared by hydrolytic condensation of both APS-PGE2 and DAS-PGE3 using formic acid a a catalyst. The polymerization of methacrylate resins photoinitiated by camphorquinone (CQ) in combination with the synthesized ASSQO was investigated. The progress of monomer conversion vs. irradiation time showed that the CQ/ASSQO pair constitutes an efficient photoinitiator system because a fast reaction and high conversion result from 60 s irradiation at 600 mW/cm2. The mechanical behaviour of these systems in flexural and compressive tests was highly dependent on the structure of the ASSQO.

La Audacia y el Cálculo: las interpretaciones sobre el kirchnerismo de Beatriz Sarlo Goldstein, Ariel Alejandro Este ensayo se propone realizar un análisis de los posicionamientos políticos de la intelectual Beatriz Sarlo sobre el kirchnerismo, considerando recientes intervenciones públicas significativas de la autora. Entre las intervenciones analizadas, se ha elegido centrar el trabajo en las posiciones asumidas en La Audacia y el Cálculo, libro donde sistematiza su perspectiva sobre el fenómeno. Es en base al análisis de estas intervenciones que pretendemos realizar una breve reflexión sobre los modos de comprensión de la política argentina que se manifiestan en el análisis de la autora. Este artículo es similar a otro publicado previamente en la revista Papeles de Trabajo. La diferencia consiste en la incorporación de las sugerencias realizadas por los evaluadores de esta revista.

Guanaco (Lama guanicoe) mortality by entanglement in wire fences Rey, Andrés; Novaro, Andres Jose; Guichon, Maria Laura Wire fences are widely used in rangelands around the world and may have a negative impact on wildlife that varies among species and habitats. The guanaco (Lama guanicoe) is the largest Patagonian ungulate and though entanglement in wire fences is frequently reported, its impact on guanaco populations has not been previously evaluated. We estimated annual mortality rate of wild guanacos due to entanglement in wire fences and evaluated whether the frequency of entanglement was age-dependent in the two wire-fence designs traditionally used in Patagonian sheep ranches. We found that annual yearling mortality on fences (5.53%) was higher than adult mortality (0.84%) and was more frequent in ovine (93. cm high) than bovine (113. cm) fences. Most guanacos died entangled by their legs in the highest wire when trying to jump over the fence. Our results suggest that guanacos are more likely to die due to fence entanglement than ungulates studied in other regions. Indirect effects of wire fences should also be considered as they may act as semi-permeable barriers for guanaco populations. We suggest removal of unnecessary wire fences and replacement by guanaco-friendly fences, like high-tensile electric fences that may reduce mortality and barrier-effect on guanaco populations.

Crecimiento de cuatro familias de Pinus taeda en respuesta a la fertilización con nitrógeno y fósforo en el establecimiento de la plantación Faustino, Laura Inés; Bulfe, Nardia Maria Luján; Pinazo, Martín; Graciano, Corina Los individuos de Pinus taeda utilizados en plantaciones comerciales sobre suelos lateríticos de Argentina, presentan heterogeneidad en la respuesta a la fertilización con nitrógeno (N) y fósforo (P) durante el establecimiento. En general, las respuestas en crecimiento a la aplicación de P son positivas, mientras que la aplicación de N en forma de urea tiene un efecto perjudicial. El objetivo de este trabajo fue evaluar la respuesta a la fertilización con N y P de cuatro familias de P. taeda seleccionadas de un plan de mejoramiento genético, y determinar si la mejora genética permite obtener materiales con diferente respuesta a la adición de estos nutrientes. Los resultados demuestran que existe variabilidad entre las familias en el crecimiento en altura y diámetro del cuello, 8 y 16 meses luego de realizada la fertilización. Las familias de mayor tasa de crecimiento, respondieron positivamente a fertilización con P y no fueron afectadas por la fertilización con N. La familia que tuvo un crecimiento intermedio, no respondió a la adición de P y fue negativamente afectada por el N. La familia de menor crecimiento, respondió positivamente frente a la fertilización con P, pero fue negativamente afectada por el N. La mejora genética permite obtener genotipos con altas tasas de crecimiento que respondan en mayor magnitud a la fertilización con P y que no sean negativamente afectados por la adición de nitrógeno. Mediante el mejoramiento genético se puede evitar la penalidad en crecimiento que implica fertilizar con urea en el establecimiento, factor que facilitaría la utilización de esta práctica silvícola para recuperar o mantener la dotación de N de los sitios que están sujetos a repetidos ciclos de plantación y cosecha.

Functional groups and common pyrolysate products of Odontopteris cantabrica (index fossil for the Cantabrian Substage, Carboniferous) Zodrow, Eewin L; D`angelo, José Alejandro; Helleur, Robert; Simunek, Zbynek Foliage of the tree-fern Odontopteris cantabrica (Order: Medullosales) is considered a reliable plant-fossil index for the Cantabrian Substage (Carboniferous, 306 Ma). Compared are two preservation states from Canada (fossilized cuticles) and the Czech Republic (compression-cuticles), representing relatively uncommon and common preservation states, respectively. The main objective is deriving spectrochemical parameters for refining the taxonomic circumscription of the species. For the comparison, five sample categories (fossilized-cuticle, macerated fossilized-cuticle, compression, cuticle, and alkaline solution) are analyzed by methods of Fourier transform infrared (FTIR) spectroscopy, complemented by pyrolysis gas chromatography mass spectrometry (Py-GC/MS) for the Canadian sample. Variation of FTIR data in the latter sample is explained by the geochemical model for the formation of fossilized-cuticles by natural maceration.As a result, we propose a set of semi-quantitative FTIR ratios (spectral regions 1800-1000 cm-1 and 3000-2800 cm-1) as spectrochemical-taxonomic parameters for the index fossil: CH2/CH3, Al/Ox, C=O/C=C, C=O cont, Ar/Al and Ar/C=C. They contain molecular structural information related to aliphatic, aromatic and oxygen-bearing moieties. As expected, small overall spectrochemical differences occur, given converging preservation states, or similar fossilization trends for the cantabrica-plant inhabiting the Variscan Forelands of the ancestral Canada-Czech geographical regions. Some chemical differences occurred due to preservations in the sample categories (i.e., fossilized-cuticle and compression) with the oxygen-bearing structures, the length and branching of polymethylenic side chains and aromatic structures. A biomacropolymeric structure is confirmed by Py-GC/MS, and deduced for the Czech sample from the higher CH2/CH3 ratios.

Digestión anaeróbica mesofílica de la fracción orgánica de residuos sólidos domiciliarios. Reactor de alimentación semicontinua Bres, Patricia; Beily, María Eugenia; Crespo, Diana Este trabajo se enfocó en el monitoreo de un reactor anaeróbico semicontínuo, alimentado a velocidad de carga constante (VC= 1,1 kgSV m-3d-1), con la fracción orgánica de residuos sólidos domiciliarios y restos de verdulería durante 12 meses. Para ello se midió la producción de biogás y se analizaron en el efluente diferentes variables físicoquímicas y los indicadores de estabilidad (IE): alcalinidad parcial/total (AT) y ácidos grasos volátiles/AT. El rendimiento de biogás fue de 112 lkgSV-1en condiciones normales de temperatura y presión (CNPT), resultando este valor menor al obtenido con otros sustratos en el mismo reactor. Los IE mostraron un buen desarrollo del proceso anaeróbico durante todo el ensayo. Además, los porcentajes de remoción del 77% y 47,5% para la demanda química de oxígeno (DQO) y sólidos volatiles (SV) respectivamente, indicaron una eficiente degradación de la materia orgánica. Sin embargo los altos valores de DQO en el efluente, muestran la necesidad de ser tratado antes de su descarga.

Participación de los inmigrantes bolivianos en espacios específicos de la producción hortícola argentina; Migrations, Work and Agricultural Global Chains Benencia, Roberto Rodolfo La horticultura en fresco en la Argentina ha sido producida históricamente por mano de obra migrante; fuera ésta europea durante las primeras décadas del siglo XX o bien limítrofe a inicios del siglo XXI. En la actualidad, podría afirmarse que la corriente migratoria proveniente de Bolivia cuasi hegemoniza no sólo la oferta de mano de obra en dicha producción en casi todos los cinturones verdes del país, sino que, además, en algunos nichos clave domina los eslabones más importantes de esta cadena agroalimentaria. Desde finales del siglo XX e inicios del XXI, los inmigrantes bolivianos, apoyándose en la tradición de la inmigración europea, están hoy ejerciendo el predominio en la producción y en la comercialización de la horticultura en fresco. Si bien en otras provincias se registra la incorporación temprana de los inmigrantes bolivianos a la horticultura en el interior del país antes de los ’80 -cuando se detecta su llegada a Buenos Aires-, podría decirse que es a partir de esta última fecha que el fenómeno se generaliza y se expande, y en los últimos años -particularmente a partir de la crisis económico-social del 2002- se puede apreciar un fuerte avance de estas familias sobre el eslabón comercial de la cadena agroalimentaria de esta producción. En este trabajo se procurará describir el proceso histórico que posibilitó la ocurrencia del fenómeno a partir de la constitución de enclaves étnicos en distintos territorios hortícolas de la Argentina.; Fresh horticulture in Argentina has historically been produced by immigrant labor, from European countries during the first decades of the twentieth century or from borderline countries at the beginning of XXI century. At present, it could be argued that the migratory flow from Bolivia quasi hegemonizes not only the supply of labor in this production in almost all the green belts of the country, but also in some key niches dominates the most important links the food chain. Since the late twentieth and early twenty-first Bolivian immigrants, drawing on the tradition of European immigration, are now exerting dominance in the production and marketing of fresh horticulture. While other provinces have recorded the early incorporation of Bolivian immigrants in horticulture at the interior of the country before the ‘80s, when it detects its arrival in Buenos Aires, it can be argued that from the latter date the phenomenon is widespread and growing, and in recent years, particularly from the economic-social crisis of 2002, we can see a strong development of these families on the commercial link in the food chain of this production. In this paper we attempt to describe the historical process that allowed the occurrence of the phenomenon based on the formation of ethnic enclaves in different territories horticultural Argentina.

The Alternative Epac/cAMP Pathway and the MAPK Pathway Mediate hCG Induction of Leptin in Placental Cells Maymo, Julieta Lorena; Pérez Pérez, Antonio; Maskin, Bernardo; Dueñas, José Luis; Calvo, Juan Carlos; Sánchez Margalet, Víctor; Varone, Cecilia Laura Pleiotropic effects of leptin have been identified in reproduction and pregnancy, particularly in the placenta, where it works as an autocrine hormone. In this work, we demonstrated that human chorionic gonadotropin (hCG) added to JEG-3 cell line or to placental explants induces endogenous leptin expression. We also found that hCG increased cAMP intracellular levels in BeWo cells in a dose-dependent manner, stimulated cAMP response element (CRE) activity and the cotransfection with an expression plasmid of a dominant negative mutant of CREB caused a significant inhibition of hCG stimulation of leptin promoter activity. These results demonstrate that hCG indeed activates cAMP/PKA pathway, and that this pathway is involved in leptin expression. Nevertheless, we found leptin induction by hCG is dependent on cAMP levels. Treatment with (Bu)2cAMP in combination with low and non stimulatory hCG concentrations led to an increase in leptin expression, whereas stimulatory concentrations showed the opposite effect. We found that specific PKA inhibition by H89 caused a significant increase of hCG leptin induction, suggesting that probably high cAMP levels might inhibit hCG effect. It was found that hCG enhancement of leptin mRNA expression involved the MAPK pathway. In this work, we demonstrated that hCG leptin induction through the MAPK signaling pathway is inhibited by PKA. We observed that ERK1/2 phosphorylation increased when hCG treatment was combined with H89. In view of these results, the involvement of the alternative cAMP/ Epac signaling pathway was studied. We observed that a cAMP analogue that specifically activates Epac (CPT-OMe) stimulated leptin expression by hCG. In addition, the overexpression of Epac and Rap1 proteins increased leptin promoter activity and enhanced hCG. In conclusion, we provide evidence suggesting that hCG induction of leptin gene expression in placenta is mediated not only by activation of the MAPK signaling pathway but also by the alternative cAMP/Epac signaling pathway.

Determinación de un coeficiente térmico desconocido a través de una sobre-condición convectiva en el borde fijo Tarzia, Domingo Alberto Se usa el modelo de región pastosa de Solomon-Wilson-Alexiades (Letters Heat Mass Transfer, 9 (1982), 319- 324) y el método dado en Tarzia (Int. J. Heat Mass Transfer, 26 (1983), 1151-1157; Int. Comm. Heat Mass Transfer, 14 (1987), 219-228) para la determinación de un coeficiente térmico desconocido de un material semi-infinito a través de un proceso de cambio de fase con una sobre-condición convectiva en el borde fijo. Se encuentran fórmulas para los seis coeficientes desconocidos y la condición necesaria y suficiente para la existencia de la solución.; We use the Solomon-Wilson-Alexiades’ mushy zone model (Letters Heat Mass Transfer, 9 (1982), 319-324) and the method given in Tarzia (Int. Heat Mass Transfer, 26 (1983), 1151-1157; Int. Comm. Heat Mass Transfer, 14 (1987), 219-228) for the determination of one unknown thermal coefficient of a semi-infinite material through a phase-change process with an overspecified convective boundary condition on the fixed face. We also find formulas for the six unknown coefficients, and the necessary and sufficient condition for the existence of the solution.

Inversion of prestack seismic data using FISTA Perez, Daniel Omar; Velis, Danilo Ruben; Sacchi, Mauricio Dino In this work we present a new inversion method to obtain AVA high-resolution attributes from prestack seismic data. The method aims to find a series of sparse reflectors that, when convolved with the source wavelet, fit the observed data. To perform the inversion, we propose the use of the Fast Iterative Shrinkage-Thresholding Algorithm (FISTA). FISTA, which can be viewed as an extension of the classical gradient algorithm, provides sparse solutions minimizing both the misfit between the modeled and the observed data, and the l1-norm of the solution. The advantage of FISTA over other methods is that no inversion over any matrix is needed, making it numerically stable, easy to apply, economic in computational terms, and adequate for solving large-scale problems even with dense matrix data. Results on synthetic and field data show that the proposed method is capable to provide high-resolution AVA attributes that honor the observed data under noisy conditions, making it an interesting alternative to other known methods.

The Socio-Historical Construction of Corruption: Examples from Police, Politics and Crime in Argentina Miguez, Daniel Pedro This paper proposes that corruption results from particular historical and social conditions. Specifically, it sustains that the stability and credibility of a society’s institutional system, the perception of a shared fate by most members of society, the levels of inequality and the perception of fair opportunities for personal progress are all elements that may deter or promote corruption. In order to show the association between these social conditions and corruption we analyse socially and historically the way that state agents such as the police, members of the judiciary and the political system relate to each other and to normal citizens. Although the examples are taken from the argentine context, they constitute a tool to understand, heuristically, why corruption is prominent in many parts of the underdeveloped world.

Physiological and biochemical responses to drought stress and subsequent rehydration in the symbiotic association peanut-Bradyrhizobium sp Furlan, Ana Laura; Llanes, Analia Susana; Luna, Maria Virginia; Castro, Stella Maris Drought stress is one of the most important environmental factors that regulate plant growth and development and limit its production. Peanut (Arachis hypogaea L.) is an agriculturally valuable plant with widespread distribution in the world serving as a subsistence food crop as well as a source of various food products. The aims of this work were to evaluate growth and nodulation as well as some physiological and biochemical stress indicators in response to drought stress and subsequent rehydration in the symbiotic association peanut-Bradyrhizobium sp. SEMIA6144. Drought stress affected peanut growth reducing shoot dry weight, nodule number, and dry weight as well as nitrogen content, but root dry weight increased reaching major exploratory surface. Besides, this severe water stress induced hydrogen peroxide production associated with lipid and protein damage; however, the plant was able to increase soluble sugar and abscisic acid contents as avoidance strategies to cope with drought stress. These physiological and biochemical parameters were completely reversed upon rehydration, in a short period of time, in the symbiotic association peanut-Bradyrhizobium sp. Thus, the results provided in this work constitute the initial steps of physiological and biochemical responses to drought stress and rehydration in this nodulated legume.

Milicias y fronteras en la formación del Estado argentino: la regulación de la Guardia Nacional de Buenos Aires (1852-1880) Literas, Luciano El artículo analiza la normativa de la Guardia Nacional entre 1852 y 1880, con el propósito de explorar la complejidad de su desarrollo de acuerdo a las disputas facciosas entorno al proyecto nacional y el avance de la frontera sobre los territorios indígenas en el contexto de organización y consolidación del Estado argentino. Sin el poder suficiente para monopolizar el poder coercitivo, el gobierno nacional debió depender de la capacidad de convocatoria militar de los gobiernos locales. Así se instauró y adquirió relevancia la Guardia Nacional formada por campesinos y vecinos domiciliados obligados a realizar ejercicios militares de forma regular y listos para acudir a todo llamado, so pena de cumplir servicio en el Ejército de Línea. Esto se sitúa en la dinámica general de progresiva dominancia del Estado como forma de integración socio política, mediante la apropiación de ámbitos funcionales en los diversos planos de la interacción social y que hacia finales del período de estudio implicó la sustitución del marco institucional provincial como principal eje articulador de relaciones sociales y la subordinación de la Guardia Nacional al Estado nacional. Los principales documentos utilizados fueron las leyes y decretos en materia militar elaborados entre 1852 y 1880, los diarios de sesiones del Congreso nacional entre 1862 y 1874 y las memorias del ministerio de Guerra y Marina entre 1868 y 1881.; The article discusses the National Guards rules between 1852 and 1880, in order to explore the complexity of their evolution, according to factional conflicts about the national political project and the ocuppation of indigenous territories. Without the capacity to monopolize coercive power, the national government depended on the local goverments military deployments. Thus the National Guard was established with peasants forced to do military exercises and ready to go to every call, under the penality of being sent to the border army. This happened during the gradual supremacy of the national state in social and political integration and that meant for one hand the replacement of the local frameworks as the hub of social relations and for other hand the National Guard subordination. The main documents used were the military laws and decrees between 1852 and 1880, the diaries of the national Congress sessions between 1862 and 1874, and the reports of the War and Marine department between 1868 and 1881.

Integración de los paneles de vuelo del satélite Cubebug-1 Bolzi, Claudio Gustavo; Bruno, C. J.; Cabot, P.; Carella, E.; Di Santo, J.; Duran, Julio Cesar; Fernández Vázquez, J.; Godfrin, Elena María; Goldbeck, V.; Gonzalez, L.; Moglioni, A.; Muñoz, S.; Olima, José María; Plá, Juan Francisco Esteban; Perez, J. I.; Raggio, D.; Socolovsky, Hernan Pablo; Tamasi, Mariana Julia Luisa Se describe la integración de los paneles de vuelo de la misión satelital CUBEBUG-1. Éstos se integraron a partir de un convenio firmado entre la CNEA y la empresa DISARMISTA SRL para la integración de 6 módulos solares de esta misión satelital. Los paneles están constituidos por 3 módulos con 2 subcadenas conectadas en serie y 3 módulos de una subcadena cada uno Estos módulos se realizaron con celdas de de triple juntura (ATJ) marca EMCORE de descarte Se presentan los parámetros eléctricos más relevantes de las celdas utilizadas y las verificaciones funcionales que se realizaron luego de la integración de los paneles.; The integration of flight solar panels of CUBEBUG-1 satellital mission is presented. This panels has been integrated from a agreement between CNEA and DISARMISTA SRL for the integration of 6 flight solar panels for CUBEBUG-1 satellital mission. The panels integration has been done using substrings of 2 solar cells connected in series, the cells used was from EMCORE advance triple junction (ATJ) non flight solar cells. The panels itself, are constituted for 3 modules with 2 substrings connected in series and 3 modules with one substring each one. The solar cells relevant electrical parameters and the curves of functional verifications after the integration are presented.

Geografía y Sistemas de Información Geográfica (SIG) en la escuela secundaria: reflexiones y propuestas para el trabajo en las aulas de la República Argentina Buzai, Gustavo Daniel; Baxendale, Claudia Alicia; Cacace, Graciela Patricia; Humacata, Luis Miguel; Caloni, Nicolas; Cruz, María del Rosario Con el inicio del siglo XXI la dimensión espacial ha cobrado particular importancia al momento de analizar y comprender el mundo que nos rodea. El desarrollo tecnológico actual ha posibilitado la aparición de las denominadas Tecnologías de la Información Geográfica (TIG) que llevan a configurar el marco de vínculos globales basados en el formato digital, en el cual la tecnología de los Sistemas de Información Geográfica (SIG) ocupa una posición destacada. El presente trabajo analiza la potencialidad que presentan los SIG como sustento aplicativo de la geografía en el aula y como herramienta fundamental que contribuye a apoyar el desarrollo de la inteligencia espacial de los alumnos. Para lograrlo se considera al SIG en su papel aplicativo que apoya una revolución tecnológica (métodos y técnicas) y una revolución intelectual (teoría y epistemología). En este sentido se analiza su surgimiento como resultado del desarrollo científico-tecnológico, los paradigmas geográficos que le brindan sustento, la formación docente necesaria para utilizarlos y los conceptos fundamentales del análisis espacial. El camino recorrido encuentra su síntesis en una propuesta de práctica didáctica orientada a la modelización digital urbana, formalizando conceptos fundamentales en diferentes niveles de complejidad posibles de ser aplicados a la Educación secundaria.; With the beginning of the XXI century the spatial dimension has been particularly important when analyzing and understanding the world around us. Current technological development has enabled the emergence of so-called Geographic Information Technologies (GIT) leading to configure the framework of global linkages based on digital format, in which the technology of Geographic Information Systems (GIS) occupies a prominent position. This paper examines the potential offered by GIS as a support application of GIT in the classroom and essential tool that helps to support the development of spatial intelligence of students. To achieve this, GIS is considered in its application role that supports a technological revolution (methods and techniques) and an intellectual revolution (theory and epistemology). In this sense its emergence is analyzed as a result of scientifictechnological developments, geographical paradigms that provide support, teacher training needed to its use and the basic concepts of spatial analysis. The path is synthesized in a proposal of a teaching practice —oriented as a digital urban modeling—, formalizing key concepts at different levels of complexity possible to be applied to secondary education.

Discépolo o el arte de la inversión Dalbosco, Dulce María El objetivo de este artículo es abordar la presencia de lo grotesco y de sus códigos en la obra tanguera de Enrique Santos Discépolo. En ella hallamos algunos textos que invierten los tópicos de ciertos motivos estereotipados del tango, mecanismo que da lugar a auténticas acuarelas grotescas. En esta ocasión nos interesa descifrar los artilugios utilizados por el autor para producir tal efecto, con el fin de comprender, en última instancia, cuál es su concepción de lo grotesco. Atenderemos tanto a las composiciones que pertenecen a lo que la crítica ha denominado “vertiente grotesca” (Conde 2003, Gobello 2004) como a la presencia de rasgos o de recursos de lo grotesco presentes en otros tangos de su autoría.