Matrix–particle interactions in catalyzed and uncatalyzed copper-filled epoxy matrix composites Tognana, Sebastian Alberto; Salgueiro, Walter Alberto; Valcarce, María Beatriz; Schreiner, Wido H.; Montecinos Espinoza, Susana de Los Angeles Epoxy composites filled with copper particles with sizes of the order of 100 μm are studied with the aim of analyzing the particle–matrix interphase. Two matrixes are used: diglycidyl ether of bisphenol A resin (DGEBA)–anhydride catalyzed using a tertiary amine, and uncatalyzed DGEBA–anhydride. The surface of both types of composites was analyzed using scanning electron microscopy, X-ray photoelectron spectroscopy, and instrumented nanoindentation. The formation of Cu(I) and Cu(II) complexes is revealed using X-ray photoelectron spectroscopy, while instrumented nanoindentation measurements allow us to determine regions with different mechanical properties in the uncatalyzed composite. The influence of anhydride and the type of curing reaction on the formation of copper complexes is analyzed. The main results point out that copper particles can interact strongly with the epoxy, depending on the chemistry and kinetics of the curing reaction, to modify the composite.

Close Encounters with Heisenberg: Uncertainty in secondary school Galanternik, Laura Irene; Arlego, Marcelo José Fabián; Fanaro, Maria de Los Angeles; Gnesi, I. In this paper we present a pedagogical strategy to introduce the Heisenberg uncertainty principle to high school students. The basis on which this proposal relies is the Fourier transform, connecting the quantum function in the x domain, Ψ(x), with the function in the wave number domain, A(k). This mathematical relationship directly leads to the uncertainty principle: a state localized in the former domain will present an inversely proportional dispersion in the latter domain. Since in acoustic we have an analog situation we can carry out experiments with sounds leading students to the understanding of the uncertainty relation. In our approach a slightly modified musical theme from the Steven Spielberg movie ‘Close Encounters of the Third Kind’ is the starting point to reach the uncertainty relation.

La reinvención de la lucha en tiempos actuales: Reflexiones en torno a las conquistas y a las deudas Flores, Miriam Liset A lo largo de los capítulos de este libro intentamos visibilizar los fundamentos políticos y normativos que enmarcaron a la EPJA tanto a nivel nacional como provincial, lo cual implicó procesos complejos de implementación desde la política educativa nacional hasta el ámbito institucional local.Invitamos a todos y todas a mantener las luchas ganadas y a seguir trabajando por las deudas pendientes de las cuales nos estamos haciendo cargo todos los sujetos que conformamos el campo de la EPJA.

Metodología para la comprensión de trayectos de implementación de la educación de jóvenes y adultos en Corrientes, período 2006/2015 Bar, Aníbal Roque; Flores, Miriam Liset La implementación de la educación de jóvenes y adultos en Corrientes ha atravesadoun largo proceso que se fue definiendo de modo paulatino en el marco de los lineamientos políticos nacionales y jurisdiccionales para la modalidad. Los mismos se fueron corporizando en un marco normativo regulatorio que fue dando condiciones parala definición de mesas de consulta para la construcción de diseños curriculares y parael planteo de estrategias de intervención, entre otras acciones que posibilitaron darfuerte entidad al sector.El presente trabajo se propuso, por una parte, recabar la normativa sobre la quese fundamentó lo realizado en la jurisdicción; y, por otra, diseñar una estrategia queposibilite obtener información sobre los sentidos, alcances, decisiones y determinaciones asumidas en ese proceso. Para el primer objetivo se realizó un relevamiento delas normas nacionales y provinciales sustanciadas en leyes, decretos, resoluciones,circulares y todo otro documento de carácter prescriptivo que orientara las acciones aseguir; y para el segundo, se desarrolló un trabajo de sistematización de experiencias,siguiendo la metodología propuesta por Jara Holliday (2012).

Ptolemaic Planetary Models and Kepler´s Laws Carman, Christian Carlos; Recio, Gonzalo Luis In this article, we aim at presenting a thorough and comprehensive explanation of the mathematical and theoretical relation between all the aspects of Ptolemaic planetary models and their counterparts which are built according to Kepler’s first two laws (with optimized parameters). Our article also analyzes the predictive differences which arise from comparing Ptolemaic and these ideal Keplerian models, making clear distinctions between those differences which must be attributed to the structural variations between the models, and those which are due to the specific parameters Ptolemy determined in the Almagest. We expect that our work will be a contribution for a better understanding not only of the Ptolemaic theories for planetary longitudes through a clearer perception of the way in which Keplerian features are present—or absent—in Ptolemy’s models, but also for a more balanced judgement of different aspects of the contribution of the first two laws of Kepler to the modern astronomical revolution.

Dalea Genus, Chemistry, and Bioactivity Studies Peralta, Mariana Andrea; Santi, María Daniela; Cabrera, Jose Luis; Ortega, María Gabriela Chemical and Biological Studieson North and Central AmericanDalea Species Dalea emoryi A. Gray[Syn.: Psorothamnus emoryi(A. Gray) Rydb.]; Daleapolyadenia F. Heller, andDalea tinctoria Brandegee[Syn.: Parosela tinctoria(Brandegee) Standl] Dalea scandens var. paucifolia(J.M. Coult.) Barneby[Syn.: D. thyrsiflora A.Gray] Dalea purpurea Vent.Dalea filiciformis B.L. Rob. &Greenm [Syn.: Paroselafiliciformis (B.L. Rob. &Greenm) Rose] Dalea carthagenensis var.barbata (Oerst.) BarnebyDalea aurea Nutt. ex Fraser[Syn.: Parosela aurea(Nutt. ex Pursh) Britton] Dalea formosa Torr.[Syn.: Parosela formosa(Torr.) Vail] 315Dalea spinosa A. Gray[Syn.: Psorothamnus spinosus(A. Gray) Barneby] Dalea searlsiae (A. Gray)Barneby [Syn.: Petalostemonsearlsiae A. Gray] Dalea frutescens A. Gray[Syn.: Parosela frutescensDalea ornata (Hook.) Eaton &J. Wright [Syn.: Petalostemonlagopus Rydb] alea versicolor Zucc. var.sessilis (A. Gray) Barneby[Syn.: Dalea sessilis (A. Gray)Tidestr]

Structure and diversity of Arbuscular Mycorrhizal fungal communities across spatial and environmental gradients in the Chaco forest of South America Grilli, Gabriel; Marro, Nicolás Alejandro; Risio Allione, Lucia Veronica The Chaco forest is one of the most diverse ecosystems in South America andharbors different vegetation units with high levels of biodiversity. However, theinformation about how belowground communities are spatially structured acrossvegetation units in the Chaco forest is scarce. We aimed to analyze the variation oftaxonomic and phylogenetic diversity and structure of the arbuscular mycorrhizal fungalcommunities across different vegetation units of the Chaco forest. Arbuscularmycorrhizal fungi (AMF) richness showed significant differences between vegetationunits. The AMF community composition was being significantly structured bygeographic variables (i.e. wider scale), environmental variables (i.e. altitude,temperature and precipitation) and edaphic (i.e. pH and Nitrogen). In addition, the AMFcommunities in Chaco forest might be phylogenetically clustered compared to local(Córdoba Province), regional (South America) and global species pool. In general, avariation of AMF communities in the Chaco forest might be determined by the spatialconfiguration and environmental conditions.

Figuras de la juventud en el discurso político argentino: reconfiguraciones de la enunciación audiovisual Buonfiglio, Yair Daniel El objetivo de este trabajo es, entonces, analizar y contrastar piezas audiovisuales correspondientes a las campañas electorales de Cristina Fernández de Kirchner en 2011 y Mauricio Macri en 2015. Consideramos que un abordaje de este tipo nos permitirá reconstruir aspectos clave de la hegemonía discursiva kirchnerista y compararla con los nuevos lenguajes que pudieron articularse a partir de su dislocación (Barros, 2012). El criterio que hemos establecido para seleccionar el corpus consiste en recortar aquellos fragmentos discursivos donde aparece tematizada, explícita o implícitamente, la figura del joven. Tal decisión se ha tomado a fin de contribuir a un proyecto mayor, donde abordamos específicamente el modo como se construye la figura del joven en la discursividad mediática y política. Nuestra argumentación puede sintetizarse en dos ejes fundamentales. El primero, referido al contenido del discurso, esto es, a los programas narrativos que construyen palabras e imágenes con el propósito de suscitar la adhesión del enunciatario a los proyectos que el enunciador se atribuye. El segundo, vinculado a los lenguajes, se pregunta por algunas marcas de la enunciación que se hacen visibles en la materia significante y por los medios donde se la hace circular.

Sistemas microparticulados orales para la liberación modificada de fármacos Leonardi, Darío; Lamas, Maria Celina; Salomon, Claudio Javier La microencapsulación es un proceso en el cual sustancias de origen sólido, líquido o compuestos gaseosos son cubiertas o dispersadas en una película de material polimérico. Cuando las dimensiones de las cápsulas obtenidas se encuentran entre 1 mm y 1 mm se denomina microencapsulación, mientras que cuando las dimensiones son menores a 1 μm se emplea el término nanoencapsulación.En un sentido amplio, la micro o nanoencapsulación provee un medio de envasar, separar y almacenar materiales en escala micrométrica o nanométrica, según sea el caso, para su posterior liberación bajo condiciones controladas.

Simple method for estimating the fractional Raman contribution Sánchez, Alfredo Daniel; Linale, Nicolás Martín; Bonetti, Juan Ignacio; Hernandez, S. M.; Fierens, Pablo Ignacio; Brambilla, G.; Grosz, Diego Fernando We propose a novel and simple method for estimating the fractional Raman contribution, fR, based on an analysis of a full model of modulation instability (MI) in waveguides. An analytical expression relating fR to the MI peak gain beyond the cutoff power is explicitly derived, allowing for an accurate estimation of fR from a single measurement of the Raman gain spectrum.

Selected aspects of the Analytical Chemistry of Amlodipine, a widely used long acting Calcium antagonist Kaufman, Teodoro Saul Amlodipine is a poly-substituted 1,4-dihydropyridine with activity as a calcium antagonist. The drug inhibits the transmembrane influx of calcium ions into vascular smooth muscles and cardiac muscles; therefore, it is prescribed in the treatment of hypertension and angina pectoris. Amlodipine, which is official in all the recognized pharmacopeias, has been in clinical use during the last 30 years. The drug is currently available as the besylate and to a lesser extent, as the maleate salt.Discussed in this article is the analytical chemistry of amlodipine, from the perspective of the modern concepts of drug purity control and the need of stability indicating assays for quality assurance purposes. Hence, the synthesis and stability of the heterocycle, as well as the preparation of impurities and their determination in different scenarios are presented. Other specific aspects such as phase transitions, as well as the determination of genotoxic impurities, the enantiomers of the drug and compounds resulting from compatibility with excipients and other substances, are also discussed.

Selected aspects of the chemical and biological profile of triclabendazole: A widely used benzimidazole fasciolicidal agent Kaufman, Teodoro Saul Fasciolosis is a very serious parasiticdisease, caused by Fasciola hepaticaand Fasciola gigantica, which isresponsible for heavy economic losses in the production of sheep and cattle inmany countries around the world. In addition, humans and other animals,including pets, may be infected. To date, triclabendazole is the only drug tocontrol fasciolosis, being effective against immature and adult flukes alike.This book chapter focuses on selectedaspects of the chemistry and biology of triclabendazole. Detailed herein arethe different alternative syntheses of the drug, analogs and prodrugs, as wellas its physical properties, with emphasis on its solubility and itscharacteristic conformational and tautomeric structural polymorphism. Inaddition, process impurities are detailed, as well as the pharmaceuticalstability of triclabendazole against stress conditions, including acid andbasic hydrolysis, oxygen (oxidation), heat and light. Thechapter also includes not only a description of the impact of the disease, butalso the pharmacokinetics and metabolism of triclabendazole, with theproduction of different oxidation metabolites on sulfur and on the2,3-dichlorophenoxy ring. Selected analytical methods for the determination ofthe drug and its metabolites in different matrices, including from commercialtablets to biological tissues (meat, liver) and fluids (milk, plasma), arepresented and discussed. Particular emphasis is given to developments thatinclude the use of chromatographic (and hyphenated) methodologies.

La ciencia positivista y la educación escolarizada Figari, Claudia Alicia Susana; Dellatorre, Graciela Focalizamos en el estudio de las bases filosóficas del orden positivista, recuperando conceptos nodales de Compte y Durkheim. Se establecen vinculaciones con la consolidación de los sistemas escolares hacia el siglo 19, poniendo en evidencia cómo el orden científico es transpuesto como orden cultural. Esta aproximación posibilita analizar las bases explicativas de este nuevo ordenamiento social, marco en el cual se problematiza el patrón civilizatorio, y, en ese marco la conformación de un sujeto acorde a las reglas juego imperantes en el orden moderno. En este sentido, se abordan las influencias positivistas e ilustradas en el Río de la Plata a través de los aportes de Sarmiento.

El sistema económico capitalista y el trabajo asalariado: disciplinamientos y resistencias Figari, Claudia Alicia Susana Focalizamos en la la conceptualización de la sociedad moderna, identificando los procesos que convergen en su génesis. Se tiene en cuenta especialmente la transición del feudalismo al capitalismo en Europa Occidental y la configuración económica y política y filosófica hacia el siglo XVII. En este capítulo caracterizamos los procesos económicos que operan en la transformación de la sociedad feudal a la sociedad capitalista, apelando a la categoría de modo de producción, a los efectos de comprender las reglas que lo rigen y su incidencia en la reproducción de las condiciones de vida y en la apropiación de la riqueza por parte de la burguesía. Analizamos también los vínculos orgánicos con la formación de los Estados nacionales modernos impulsado por las revoluciones burguesas del siglo XVIII- y ponemos de manifiesto los mecanismos complejos que contribuyen a legitimar y garantiza la reproducción de la relación social capital-trabajo.

Two-dimensional Sturmian basis set for bound state calculations Randazzo, Juan Martin; Ancarani, Lorenzo Ugo Sturmian functions (SF) constitute a very useful spectral tool to deal with bound states or break-up problems in atomic and molecular physics. In their standard form for the three-body case, the radial part of the wave function is proposed as an expansion in products of one-dimensional generalized SF (GSF). Here, we present an alternative spectral approach. It is based on solutions of a two-dimensional Sturmian eigenvalue problem that is solved with a finite set of one-dimensional GSF. The resulting 2DSF basis set functions depend simultaneously on two interparticle distances and possess a natural reordering. Through calculations of the Helium ground and 41F excited states energy, we compare the efficiency of the two equivalent sets of functions. The superiority of the two-dimensional approach demonstrated here should be particularly useful to reduce computational costs for applications in the continuum regime.

Modelos estadísticos en lenguaje R Garibaldi, Lucas Alejandro; Oddi, Facundo José; Aristimuño, Francisco Javier; Aliosha, Nicolás Behnisch Los profesionales de las ciencias económicas y ambientales deben resolver problemas a partir de la colección y el análisis de datos. En general, estos datos son tomados de una muestra procedente de relevamientos o experimentos, es decir que la información con la que trabajan es parcial. Por lo tanto, deben contar con herramientas que los ayuden a tomar la mejor decisión ante preguntas que tienen respuestas inciertas.La estadística aporta las herramientas necesarias para colectar los datos, a la vez que permite resumir y presentar la información contenida en la muestra, para luego inferir en base a ella características fundamentales de la población de la que fue extraída. Además, posibilita cuantificar la incertidumbre asociada a nuestras respuestas o, dicho de otra manera, la probabilidad de equivocarnos en la decisión tomada. Por lo tanto, al utilizar la estadística, las conclusiones estarán sustentadas por un sólido marco de análisis. Este libro cubre los temas de un segundo curso de grado en estadística y amplía sus contenidos a muchas de las herramientas utilizadas actualmente para la resolución de problemas económicos y ambientales, acerca de las cuales la oferta académica es reducida. Creemos que ello, junto con el enfoque de taller del curso, flexibiliza el aprendizaje del lector ayudándolo a lograr independencia para resolver los problemas a los cuales se enfrentará durante su actividad profesional.A lo largo de los capítulos (suponemos que el lector está familiarizado con los conceptos básicos de estadística y probabilidad) ponemos a disposición ejercicios prácticos para adquirir los conocimientos básicos sobre cómo colectar datos (diseño de estudios), modelarlos y analizarlos utilizando el programa R.

Antifungal activity of Bignoniaceae plants on Aspergillus carbonarius and Aspergillus niger Apud, Gisselle Raquel; Aredes Fernández, Pedro Adrián; Kritsanida, Marina; Grougnet, Raphael; Sampietro, Diego Alejandro Twenty four extracts from Bignoniaceae plants of northwest Argentina were tested for antifungal activity against Aspergillus species responsible of the grape black rot. Stems and leaves of Amphilophium cynanchoides, Macfadyena cynanchoides, Tecoma stans and Jacaranda mimosifolia were separately extracted with solvents of increasing polarity to obtain the dichloromethane (fCH2Cl2), ethyl acetate (fEtOAc) and methanol extracts (fMeOH). The fCH2Cl2 from stem of M. cynanchoides had the lowest IC50 (1.0-1.2 mg/mL) and MID values (0.6-1.2 mg) and the highest ID values (5.0-6.8 mm) on A. niger and A. carbonarius. The main contributors of the antifungal activity of fCH2Cl2 were identified as lapachol (MIC = 0.25-1.00 mg/ml) and 1-hydroxy-4-methylanthraquinone (MIC = 0.0625-0.125 mg/mL). These compounds synergized the antifungal activity of sodium metabisulfite and showed an additive effect in mixtures with propiconazol. They might be used as additives of commercial antifungals to protect grapes against A. niger and A. carbonarius.

Obesidad y características de personalidad en adolescentes de Argentina y España. Un estudio transcultural; Obesity and personality characteristics in adolescents from Argentina and Spain: A cross-cultural study Lacunza, Ana Betina; Sal, Francisco Javier; Paredes, Víctor; Collado Yurrita, Luis; Caballero, Silvina Valeria; Diaz Molina, Paula; CordobesRol, Marta; Salazar Burgos, Ramiro Joaquín; Bermejo de las Heras, Sara; Leon, Joana; San Mauro Martin, Isabel Los objetivos fueron: a) comparar la presencia de sobrepeso y obesidad en adolescentes escolarizados de Argentina y España, b) comparar las características de personalidad según mediciones antropométricas y lugar de residencia y c) identificar la presencia de riesgo psicopatológico en los adolescentes. Se trató de un estudio comparativo, transversal, con un muestreo intencional. Participaron 272 adolescentes de 11 a 16 años de Tucumán?Argentina (n = 108) y Madrid?España (n = 164). Se administró el Cuestionario de Personalidad de Eysenck (EPQ-J) y mediciones antropométricas de talla y peso. Se calculó el IMC, estableciéndose grupos clínico y control. El 39% de los adolescentes españoles y el 43% de argentinos presentaban sobrepeso u obesidad. No se observaron diferencias estadísticas en las características de personalidad según grupo clínico o control y residencia. Sin embargo, los adolescentes con obesidad de ambos países referían mayor neuroticismo. Por su parte, los adolescentes argentinos referían mayor neuroticismo y dureza emocional (4% de alto riesgo). Un 3% de sus pares españoles mostraban alto riesgo en neuroticismo. Los datos observados muestran que no puede establecerse un perfil psicopatológico propio del adolescente con sobrepeso u obesidad, aunque el contexto tiene importancia en los datos descriptos.; The objectives of this study were: 1. To compare the presence of overweight and obesity in adolescents from Ar- gentina vs. Spain, 2. To compare personality according to nutritional diagnosis (ND) and place of residence (PR), and 3. To identify the presence of psychopathological risk (PR). A total of 272 adolescents, men and women from 11 to 16 years completed the Personality Questionnaire for Children of Eysenck (EPQ-J) and body mass index was calculated through height and weight measures. The 39% of the Spanish adolescents and 43% of the Argentinians presented overweight or obesity, two clinical groups were formed, one per country and both control groups were constituted by the normal weight participants. The combination of the variables ND and PR did not show signifi- cant differences in terms of personality dimensions. However, both clinical groups presented greater neuroticism (NE) than their control peers. Regarding the PR, the Argentine adolescents registered higher NE and emotional hardness (4% of high risk) than 3% of high risk of NE in the Spanish. The data obtained did not allow to establish a psychopathological profile of the overweight or obese adolescent, this is because the influence of the country of origin prevailed.

A linked modelling framework to explore interactions among climate, soil water, and land use decisions in the Argentine Pampas García, Guillermo A.; García, Pablo Enrique; Rovere, Santiago Luis; Bert, Federico Esteban; Schmidt, Federico Martín; Menendez, Angel Nicolas; Nosetto, Marcelo Daniel; Verdin, Andrew; Rajagopalan, Balaji; Arora, Poonam; Podestá, Guillermo P. In flat environments, groundwater is relatively shallow, tightly associated with surface water and climate, and can have either positive and negative impacts on natural and human systems depending on its depth. A linked modelling and analysis framework that seeks to capture linkages across multiple scales at the climate/water/ crop nexus in the Argentine Pampas is presented. This region shows a strong coupling between climate, soil water, and land use due to its extremely flat topography and poorly developed drainage networks. The work describes the components of the framework and, subsequently, presents results from simulations performed with the twin goals of (i) validating the framework as a whole and (ii) demonstrating its usefulness to explore interesting contexts such as unexperienced climate scenarios (wet/dry periods), hypothetical policies (e.g., differential grains export taxes), and adoption of non-structural technologies (e.g., cover crops) to manage wáter table depth.

Interception, throughfall and stemflow partition in drylands: Global synthesis and meta-analysis Magliano, Patricio Nicolás; Whitworth Hulse, Juan Ignacio; Baldi, Germán The net amount of rainfall entering into the soil and its spatial distribution at the patch scale are key drivers of ecosystem processes in drylands. The spatial distribution of water is mainly controlled by vegetation canopy which determines the partitioning of rainfall into interception, throughfall and stemflow. In this paper, we synthesized and analyzed rainfall partitioning for 68 woody plant species in drylands (delimited by a rainfall-potential evapotranspiration ratio <0.65; 46 papers). We explored the role of rainfall inputs and plant morphological attributes (life form, phenology, leaf type and bark type) by considering a rainfall gradient from 145 to 805 mm year^−1. On average, interception, throughfall and stemflow accounted for 24.0, 69.8 and 6.2% of total rainfall, respectively. Stemflow was the most variable flux (coefficient of variation = 107.8%), while interception and throughfall were less variable fluxes (coefficient of variation = 39.2 and 20.4%, respectively). Along the increasing rainfall gradient, interception showed a tendency to decrease from 27.1 to 18.9% (p = 0.12), throughfall increased from 61.4 to 81.2% (p < 0.01) and stemflow decreased from 10.0 to 1.6% (p < 0.0001). Shrubs presented higher stemflow than trees (9.4% vs. 3.5%, respectively; p < 0.0001), while trees presented higher throughfall than shrubs (72.3% vs. 63.0%, respectively; p < 0.05). Species with smooth barks presented higher stemflow than species with rough barks (8.3% vs. 4.2%, respectively; p < 0.0001). Both phenology and leaf type had no effect on interception, throughfall and stemflow (p > 0.05 for all cases). Shrubs were more abundant towards the dry edge of the rainfall gradient (145-500 mm year^−1), while trees were more abundant towards the subhumid edge (500-805 mm year^−1). These results suggested that higher stemflow found towards the dry edge of the rainfall gradient was caused by the higher abundance of shrubs, which generated more stemflow than trees. Our findings highlighted the ecohydrological key role of vegetation life form and rainfall inputs affecting the amount of water entering into the soil and its spatial distribution in drylands.