Modulación de la respuesta a insulina en el ovario bovino y su relación con la enfermedad quística ovárica; Modulation of insulin response in ovarian cattle and its relationship with cystic ovarian disease Panzani, Carolina Guadalupe; Hein, Gustavo Juan; Salvetti, Natalia Raquel; Ortega, Hugo Hector; Rey, Florencia La enfermedad quística ovárica bovina es una importante enfermedad que afecta la fertilidad del ganado bovino lechero. Diversos procesos ováricos tales como la proliferación celular y la esteroidogénesis se encuentran regulados por numerosas hormonas entre las que se encuentra la insulina. La respuesta a esta hormona se desencadena luego de la unión a su receptor específico. El objetivo de la presente revisión es analizar la función de intermediarios claves en la vía de señalización intracelular, que actúan en los primeros estadios involucrados en la respuesta a insulina. Se analizan el receptor de insulina (IR), el sustrato -1 del IR (IRS1) y la enzima fosfatidilinositol 3-quinasa (PI3K) denotando modificaciones ocurridas en folículos quísticos que podrían influenciar negativamente en la funcionalidad de ovarios y contribuir a la persistencia folicular.; Cystic ovarian disease (COD) is an important disease affecting fertility in dairy cattle. Several ovarian processes such as cell proliferation and follicular cell steroidogenesis are regulated by numerous hormones including insulin. The hormone response is triggered after the binding to its receptor. The aim of this review is to analyze the role of key intermediates in the intracellular signaling pathway that act in the early stages of the insulin response. Therefore, insulin receptor (IR), IR substrate-1 (IRS1) and phosphatidylinositol-3-kinase (PI3K) are analyzed showing changes that occur in cystic follicles and which could negatively influence the functionality of ovaries and contribute to follicle persistence.

Magma mixing on the Famatinian magmatic arc from northwest Argentina: Example in the Diablillos intrusive complex, southern Puna; Magma mixing on the Famatinian magmatic arc from northwest Argentina: Example in the Diablillos intrusive complex, southern Puna Suzaño, Nestor Omar; Becchio, Raul Alberto; Nieves, Alexis Iván Angel; Sola, Alfonso Manuel; Ortiz Yañez, Agustín En el borde oriental de la Puna Austral, sierra de Inca Viejo, noroeste de Argentina, aflora el complejo intrusivo Diablillos compuesto por rocas calcoalcalinas de arco representado por monzogranitos, granodioritas, tonalitas y dioritas. El monzogranito y rocas intermedias contienen abundantes enclaves y diques sinmagmáticos máficos. Las relaciones de campo, estudios petrográficos y geoquímicos, sugieren que el principal mecanismo de diferenciación magmática es por mezcla de magmas. Las rocas de composición intermedia, granodioritas y tonalitas, constituyen el producto de la mezcla (mixing) entre magmas de origen cortical y básico juvenil. La mezcla de magmas esta evidenciado a partir de observaciones de campo (enclaves microgranulares máficos), petrográficas (en plagioclasa manteada con hornblenda y biotita, cuarzo ocelli, fenocristales de feldespato potásico en enclaves máficos) y en las composiciones geoquímicas (línea de evolución magmática no-cotéctica), sin embargo, no se descarta una evolución compleja acompañada por procesos de asimilación de roca de caja y cristalización fraccionada. Las relaciones de contacto entre los distintos tipos litológicos y enclave-hospedante, sugieren la construcción de una cámara magmática por múltiples pulsos y emplazamiento en niveles medios de la corteza continental. En el contexto local y regional, las afinidades geoquímicas y la edad obtenida del complejo intrusivo Diablillos (501±17 Ma, U/Pb en circón) son consistentes con la faja magmática del complejo eruptivo Oire. La mezcla de magmas constituye uno de los mecanismos actuantes en el origen y evolución del magmatismo paleozoico inferior en el contexto del arco Famatiniano, asociado a un ambiente de subducción.; On the eastern edge of the southern Puna, Inca Viejo range, NW Argentina, outcrops of the Diablillos intrusive complex are composed of a series of calc-alkaline magmatic arc rocks represented by monzogranite, granodiorite, tonalite and diorite. The monzogranite and intermediate rocks contain abundant enclaves and dismembered dikes. Field relationships, petrographic and geochemical studies suggest that the main mechanism of magmatic differentiation of the magmas was by magma mixing and mingling. Rocks of intermediate composition, such as granodiorite and tonalite correspond to a mixing forming process between crustal and mantle-derived magmas. Magma mixing is observable in the field (microgranular mafic enclaves) and evidenced in the geochemical diagrams (magmatic evolution by no-cotectic line), however, a complex magmatic evolution by processes of fractional crystallization and assimilation of country rocks, can not be ruled out. Contact relationships between the different lithological types and enclave-host, suggest that a magma chamber was formed by multiple pulses and was emplaced in middle levels of the continental crust. In a local and regional context, the geochemical affinities and the age of the Diablillos intrusive complex (501±17 Ma, U/Pb on circon) are consistent with the magmatism of the Oire eruptive complex. Magma mixing is one of the main mechanisms intervening in the origin and evolution of lower Paleozoic magmatism in the Famatinian arc, associated to a subduction setting.

Deleuze y el estado pluralista Ferreyra, Diego Julián A partir de un diagnóstico de época de debilitamiento del Estado, este artículo confronta la filosofía política de Gilles Deleuze con las interrogaciones de Carl Schmitt al estado pluralista, fundamentalmente, si es capaz de intervenir en situaciones de crisis o excepción y si es capaz de distinguir una organización estatal de una banda de ladrones. Se intentará mostrar que el pluralismo ontológico de Deleuze -al no basarse en partes extensivas o individuos ya constituidos, sino en partes intensivas inherentemente relacionales que se actualizan en relaciones sociales ontológicamente vigorosas- si bien no permite evitar la degradación característica de la existencia, sí funda una ética estatal donde las formas políticas implican una porción de orden concreto.

La filosofía marxista entre Francia y América Latina: una lectura de la correspondencia entre Louis Althusser y Fernando Navarro Starcenbaum, Marcelo

Catálogo revisado y actualizado de Sphingidae de Argentina, con seis nuevos registros (Lepidoptera; Sphingidae); Revised catalog of Sphingidae from Argentina, with six new records (Lepidoptera: Sphingidae) Núñez Bustos, Ezequiel Osvaldo Se presenta un catálogo revisado y actualizado de 123 especies de Sphingidae de Argentina compilado en base a citas bibliográficas, ejemplares de colecciones públicas y privadas y datos del autor. Son citadas seis nuevas especies para el país que no poseían registros previos publicados (Manduca boliviana (B. P. Clark, 1923), M. brasiliensis (Jordan, 1911), M. prestoni (Gehlen, 1926), Nyceryx furtadoi Haxaire, 1996, Perigonia lusca (Fabricius, 1777) y Eumorpha megaeacus (Hübner, [1819])), las cuales se ilustran y comentan. Se agregan nuevas provincias al rango geográfico de varias especies en el listado. Por el contrario algunas especies citadas hace tiempo atrás, pero no halladas en colecciones ni colectadas desde entonces, son retiradas de la lista y en otros casos al menos discutida su presencia en el país. Se confirma la presencia de Manduca schausi (B. P. Clark, 1919), Callionima guiarti (Debauche, 1934) y Nyceryx continua (Walker, 1856) con ejemplares argentinos en colecciones nacionales y extranjeras.; A revised and updated catalogue of 123 species of Sphingidae from Argentina is presented. It has been compiled based on bibliographic, references, specimens in both public and private collections and information known by the author. Six new species are recorded for the country that had not previously published records (Manduca boliviana (B. P. Clark, 1923), M. brasiliensis (Jordan, 1911), M. prestoni (Gehlen, 1926), Nyceryx furtadoi Haxaire, 1996, Perigonia lusca (Fabricius, 1777) and Eumorpha megaeacus (Hübner, [1819])), which are illustrated. New provinces are added to the geographic range of several species. By contrast some species mentioned long ago but not found in collections or collected since then are removed from the list and in other cases there is at least a discussion about their presence in the country. The presence of Manduca schausi (B. P. Clark, 1919), Callionima guiarti (Debauche, 1934) and Nyceryx continua (Walker, 1856) with argentinean specimens in both national and foreign collection is confirmed.

La prensa tucumana durante el juarismo: disputas políticas y querellas judiciales Navajas, Maria José El trabajo analiza el papel de los periódicos en la configuración y desarrollo del conflicto político durante la presidencia de Juárez Celman. Para ello, se estudia el caso del diario El Orden en Tucumán, examinando las demandas por calumnias e injurias y una serie de acciones violentas que lo tuvieron como protagonista. Se busca poner de manifiesto la articulación de tales incidentes con el accionar político del periódico en el ámbito provincial y también en la escena nacional. Asimismo, se procura brindar una explicación sobre el funcionamiento del poder judicial y delimitar su papel en la tramitación de las disputas que se suscitaban en la prensa.; This paper analyzes the role of newspapers in shaping and developing political conflict during Juárez Celman’s presidency. For this purpose, we study the case of the newspaper El Orden in Tucumán province, examining the lawsuits against the press by the offences to the honor and the attacks on the newspaper editor. It seeks to highlight the articulation between these incidents and the newspaper’s political action, both at the provincial and on the national level. It also seeks to provide an explanation of the functioning of the judiciary and define its role in the handling of disputes that emerged in the press.

Huelga, insurrección y aniquilamiento: Argentina, enero de 1919 Iñigo Carrera, Nicolas Es un ejercicio de conceptualización sobre la llamada "Semana Trágica" de enero de 1919, uno de los acontecimientos más destacados en la historia de la clase obrera argentina. Su objetivo es conocer la naturaleza de ese hecho, utilizando conceptos acuñados en el desarrollo del cuerpo teórico fundado por Marx, para localizarlo en una escala universal de formas de lucha, y rechazar la tendencia vigente en la historiografía que evita dar carácter universal a los hechos de rebelión ocurridos en Argentina. La búsqueda de una conceptualización también confronta con las lecturas de los hechos protagonizados por la clase obrera que tienden a enfatizar las acciones de las clases dominantes y la condición de "víctima" de los obreros en lucha por sobre su condición de sujeto de la historia.

Etnobotánica de las plantas leñateras y su circuito comercial en una ciudad de la Patagonia Argentina; Ethnobotany of fuel-wood yielding plants and their commercial distribution in a city in patagonia, Argentina Arre, Jessica Soledad; Molares, Soledad; Ladio, Ana Haydee; Kutschker, Adriana Mabel En poblaciones rurales y periurbanas de Argentina, la flora leñosa es una de las principales fuentes de combustible para la calefacción y cocción de alimentos. Mediante un abordaje etnobotánico urbano se propuso identificar en Esquel, Chubut, las principales especies leñateras empleadas, los distintos usos dados a las mismas y las características generales de su comercialización. Se realizaron 13 entrevistas semi-estructuradas a expendedores y 33 entrevistas a consumidores de leña de esta localidad. El circuito comercial se basa en la compra-venta de ocho especies vegetales (5 nativas, 3 exóticas) provenientes de áreas boscosas de la cordillera andina. Además, los consumidores se abastecen de especies por recolección en la vía pública y en forestaciones municipales próximas a sus viviendas, junto con la compra de desechos de maderas en aserraderos locales. El ñire (Nothofagus antarctica) es la especie de mayor circulación comercial e importancia cultural en relación a este uso, lo cual responde a su alta calidad, moderado precio y buena disponibilidad, según los informantes. La fuerte dependencia del uso de especies leñateras en barrios suburbanos de esta ciudad pone en evidencia estrategias de provisión muy diversas por parte de la gente, pero circunscriptas a un número muy restringido de especies por lo que pondría en serios riesgos la conservación de los recursos nativos.; – In rural and peri-urban populations of Argentina, woody plants constitute one of the principal sources of fuel for heating and domestic cooking. Using an ethnobotanical approach, we aimed to identify in Esquel, Chubut, the main fuel-wood species used, the different uses they were put to, and the general characteristics of their commercialization. In this locality, 13 semi-structured interviews were carried out with fuel-wood retailers and 33 interviews with users. Commercial distribution is based on the marketing of eight plant species (five native and three exotic), which come from the forested regions of the Andean cordillera. In addition, users obtain supplies by gathering fuel-wood at the roadsides and in public wooded lands close to their homes, as well as purchasing waste from local sawmills. According to informants, the Antarctic beech (Nothofagus antarctica) is the most extensively commercialised species and the most culturally important in relation to this use, due to its high quality, reasonable price and ready availability. The marked dependence on fuel-wood species in suburban neighborhoods of this city is sustained by diverse supply strategies employed by locals, but these are restricted to a very limited number of species, which therefore puts the conservation of native species at serious risk.

Tan lejos, tan cerca: Ética y emociones en el trabajo de campo en un contexto trágico; So far, so close: Ethics and emotions in fieldwork in a tragic context Zenobi, Diego Sebastian En el presente trabajo me propongo indagar en los vínculos que se traman en el campo entre el antropólogo social y los sujetos con los que trabaja, cuando su tarea es llevada adelante en un contexto trágico y profundamente angustiante. Entre los años 2006 y 2009 realicé el trabajo en terreno para mi tesis doctoral en un grupo de familiares de los fallecidos en el incendio del estadio "República Cromañón" ocurrido en 2004. A lo largo de ese proceso, mis emociones y mis supuestos sobre la muerte y sobre cómo relacionarme con quienes estaban vinculados a ella por haber perdido un hijo trágicamente, cristalizaron en una decisión de carácter ético de acuerdo con la cual opté por evitar ciertos comportamientos y actitudes (opinar en sus debates, asistir a ciertos eventos y espacios, exponer públicamente mi angustia, etc.), a los que consideraba como prerrogativas exclusivas de los familiares. Así, en los primeros meses adopté una conducta que no coincidía con las expectativas que algunos padres tenían sobre mi presencia entre ellos, lo que contribuyó a generar tensiones y sospechas sobre mi persona.En el presente trabajo me propongo analizar el modo en que mis ideas y sentimientos en torno de la muerte colaboraron a modelar mi posición como investigador en el terreno. A tal fin retomo las elaboraciones de Elias quien ha analizado el modo en que las sociedades contemporáneas se representan aquel fenómeno que, al decretar el final de una persona, transforma profundamente la vida de los vivos.; In this paper I will look into the relationships carried out along fieldwork in a tragic and deeply distressing context. I carried on my fieldwork in a group of relatives of those killed in the fire at the stadium “Republic Cromañón”. Throughout this process, my emotions and my assumptions about the death and how to relate with that relatives, crystallized in a decision of ethical nature: I would avoid certain behaviors and attitudes (give my opinion in their debates, being on certain certain events and spaces, publicly expose my distress, etc.), which I considered as the exclusive prerogative of the parents of the dead young kids. Consequently, I adopt a behavior that did not match with some parents expectations on my presence among them, and contributed to generate tensions and suspicions about me. I will analyze how my feelings and ideas about death contributed to shape my position as researcher on the field. Here I refer to Elias who has analyzed how contemporary societies represented this phenomenon as one that transforms deeply the life of the living people.

The INQUA Dunes Atlas chronologic database Lancaster, Nicholas; Wolfe, Stephen; Thomas, David; Bristow, Charlie; Bubenzer, Olaf; Burrough, Sallie; Duller, Geoff; Halfen, Alan; Hesse, Paul; Roskin, Joel; Singhvi, Ashok; Tsoar, Haim; Tripaldi, Alfonsina; Yang, Xiaoping; Zárate, Marcelo Arístides The INQUA Dunes Atlas project has developed a global digital database of chronological information for periods of inland or continental sand dune accumulation and stabilization. The database comprises information on the site location (including coordinates), dune type, and stratigraphic context, pertinent analytical information (e.g. luminescence procedures), and literature citations to the original data source. This paper discusses the background to the project, the concept and structure of the chronologic database that forms its core, and gives some examples of the scope of the database and ways in which it can contribute to greater understanding of the spatial and temporal variability in dune development.

Espacios de consumo populares: las ferias comerciales de indumentaria en Argentina; Popular space of consumer: the clothing business fairs in Argentina Schiaffino, Guillermo Nicolás; Di Nucci, Josefina Inés En el período actual, la expansión del consumo en el territorio se materializa en las ciudades, evidenciándose el avance y la instalación de diferentes espacios de consumo. Por un lado, espacios de consumo de grandes capitales del circuito superior como son los shoppings center, supermercados e hipermercados; y por otro lado, espacios de consumo populares como las ferias comerciales de indumentaria y accesorios, denominadas muchas veces shoppings populares, con características distintivas del circuito inferior de la economía urbana (Santos, 1979). En este sentido, se observa que cada vez más las variables distintivas del período, como son la técnica, la información, la publicidad, las finanzas, el crédito, entre otras, se hacen presentes en este tipo de actividades. Proponemos en este artículo reflexionar sobre la importancia de estas variables haciendo énfasis en el consumo y en los diversos espacios comerciales. Se presentan brevemente las características del período actual y la centralidad del consumo. Luego, se profundiza en los espacios de consumo populares como las ferias comerciales de indumentaria en la Argentina para, por último, explicar sintéticamente el caso de la megaferia “La Salada”.; In the current period, the expansion of consumption in the territory materializes in cities demonstrating the progress and installation of different consumer spaces. On the one hand, consumer spaces large capital the upper circuit such as shopping centers, supermarkets and hypermarkets on the other hand, spaces popular consumer and trade shows of clothing and accessories, called often popular shopping, with distinctive features lower circuit of the urban economy (Santos, 1979). In this regard, it is noted that increasingly distinctive period variables such as technical, information, advertising, finance, credit, among others, are present in such activities. We propose in this article reflect on the importance of these variables with emphasis on consumption and the various commercial spaces. Briefly introduces the features of the current period and the centrality of consumption. Then it delves into the spaces of popular consumption and are apparel trade shows in Argentina to finally synthetically explain the case of the mega exhibition "La Salada".

Inflationary gravitational waves in collapse scheme models Mariani, Mauro; Bengochea, Gabriel Roman; Leon Garcia, Gabriel The inflationary paradigm is an important cornerstone of the concordance cosmological model. However, standard inflation cannot fully address the transition from an early homogeneous and isotropic stage, to another one lacking such symmetries corresponding to our present universe. In previous works, a self-induced collapse of the wave function has been suggested as the missing ingredient of inflation. Most of the analysis regarding the collapse hypothesis has been solely focused on the characteristics of the spectrum associated to scalar perturbations, and within a semiclassical gravity framework. In this Letter, working in terms of a joint metric-matter quantization for inflation, we calculate, for the first time, the tensor power spectrum and the tensor-to-scalar ratio corresponding to the amplitude of primordial gravitational waves resulting from considering a generic self-induced collapse. 

Phototriggered fibril-like environments arbitrate cell escapes and migration from endothelial monolayers Salierno, Marcelo Javier; García Fernández, Lui; Carabelos, Noelia; Kiefer, Karin; García, Andrés J.; Campo, Aránzazu del Cell detachment and migration from the endothelium occurs during vasculogenesis and also in pathological states. Here, we use a novel approach to trigger single cell release from an endothelial monolayer by in-situ opening of adhesive, fibril-like environment using light-responsive ligands and scanning lasers. Cell escapes from the monolayer were observed on the fibril-like adhesive tracks with 3-15 μm width. The frequency of endothelial cell escapes increased monotonically with the fibril width and with the density of the light-activated adhesive ligand. Interestingly, treatment with VEGF induced cohesiveness within the cell layer, preventing cell leaks. When migrating through the tracks, cells presented body lateral reduction and nuclear deformation imposed by the line width and dependent on myosin contractility. Cell migration mode changed from mesenchymal to amoeboid-like when the adhesive tracks narrowed (≤5 μm). Moreover, cell nucleus was shrunk showing packed DNA on lines narrower than the nuclear dimensions in a mechanisms intimately associated with the stress fibers. This platform allows the detailed study of escapes and migratory transitions of cohesive cells, which are relevant processes in development and during diseases such as organ fibrosis and carcinomas.

Cognitive problem-solving abilities and speech acts in children: an analysis in vulnerable family contexts Morelato, Gabriela Susana; Ison, Mirta Susana; Amaya, Marcela; Delgado, Melania The goal of this study was to analyze the cognitive abilities involved in interpersonal problemsolving and their connection with speech acts in children from contexts of social vulnerability. The sample included 120 schoolchildren between the ages of 8-13 in Mendoza, Argentina. The results showed that the children from more vulnerable family backgrounds, presented significantly less expressive speech acts than children at low vulnerability. It was also observed that displayed significantly poorer identification of emotions and anticipated significantly more negative consequences. In contrast, children who had high level of protective factors identified significantly more emotions, tended to generate more alternatives and anticipated less negative consequences. These results highlight the importance of carrying out early evaluations in contexts of risk, taking a preventive approach, and articulating knowledge from the fields of psychology and linguistics in order to develop new kinds of intervention and support strategies destined to children in school contexts.

First Fossil Record of Parasitic Flat-Bark Beetle (Coleoptera: Passandridae) from the Eocene of Patagonia, Argentina; Primer registro fósil de escarabajos planos de la corteza (Coleoptera: Passandridae) del Eoceno de la Patagonia, Argentina Ramírez, Leonardo César; Corsolini, Julián; Di Iorio, Osvaldo Catogenus punctatus sp. n. is the first fossil species described of the family Passandridae(Coleoptera: Cucujoidea) worldwide. The specimen was extracted from the Rio Pichileufú fossil-bearing strata, Huitrera Formation, Rio Negro, Argentina.; Catogenus punctatus sp. nov. es la primera especie fósil de la familia Passandridae (Coleoptera: Cucujoidea) descripta en el mundo. El espécimen fue extraído de los estratos fosilíferos de Río Pichileufú, en la Formación Huitrera, Río Negro, Argentina.

Utilización de imágenes satelitales para el estudio de la distribución térmica en distintas coberturas del suelo de la ciudad de Bahía Blanca (Argentina).; Utilization of satellite images to study the thermal distribution in different soil covers in Bahia Blanca city (Argentina) Ferrelli, Federico; Bustos, M.l.; Huamantinco Cisneros, M. A.; Piccolo, Maria Cintia El estudio del clima urbano es relevante para conocer el ambiente donde habita la mayor parte de la población. Las ciudades presentan sectores que incluyen estructuras edilicias, espacios verdes, suelos al descubierto, tránsito vehicular, necesidades calóricas de la ciudad y diferentes coberturas de sombras. Actualmente, el cambio climático y sus efectos sobre las ciudades son temas de gran interés científico. Son escasas las investigaciones que interpretan los cambios térmicos que se producen en el interior de las ciudades debido a la densificación de los edificios y como consecuencia de la variabilidad climática. Por tal motivo, el objetivo de este trabajo fue analizar el comportamiento de la Temperatura de Superficie Terrestre (TST) y su relación con las distintas coberturas del suelo en la ciudad de Bahía Blanca, Argentina. Para ello, se analizaron imágenes satelitales Landsat 5 TM y 7 ETM+ con el método monocanal. Además, se realizó un mapa de coberturas del suelo mediante interpretación visual de imágenes satelitales validado por intervención empírica. Posteriormente, se relacionaron los datos de TST con las coberturas del suelo. En el centro de la ciudad, la TST presentó variaciones espaciales heterogéneas según las estaciones del año y las sombras generadas por los edificios. Los mayores valores de TST se localizaron en la periferia (45,1°C) y en urbano muy disperso (46°C) y el menor en el centro de la ciudad (2°C). Las distintas coberturas del suelo generaron menores fluctuaciones de TST en invierno (>5°C) y las mayores en verano (entre 15 y 25°C).; The study of the urban climate is relevant to increase the knowledge about the environment where live most of the world’s population. Cities have areas that include buildings, green spaces, un-vegetated soils, transit, among others. Currently, scientists are focusing on the effects of climate change in cities. There is a shortage of studies that analyze the thermal changes that occur in the inner city due to the densification of buildings. For these reasons, the aim of this study was to analyze the spatial distribution of Land Surface Temperature (LST) and its relation with different soil covers in Bahia Blanca city, Argentina. Satellite images from Landsat 5 TM and Landsat 7 ETM + were analyzed with singlechannel method. Besides, it was made a soil coverage map through visual interpretation of satellite images and it was validated with field trips. LST data were compared with each soil coverage. In downtown, the LST was heterogeneous and presented spatial variations according to the season and the shadows of the buildings. The maximum values of LST were localized in the periphery (45.1°C) and in urban very sparse (46°C) and the minimum in downtown (2°C). Each soil cover had minor fluctuations in the winter (>5°C) and higher in the summer (15 to 25°C).

Variations in macrobenthic community structure in relation to changing environmental conditions in sandy beaches of Argentina Carcedo, Maria Cecilia; Fiori, Sandra Marcela; Piccolo, Maria Cintia; López Abbate, María Celeste; Bremec, Claudia Silvia This study describes for the first time the intertidal macrobenthic community of exposed sandy beaches located near the Bahía Blanca Estuary (38°S) and reports the physical characterization of this coastal fringe. The main objective of the study was to link environmental variables to biotic information, analyzing the results in the context of the Swash Exclusion Hypothesis (SEH) and possible estuarine influence. Four beaches were sampled seasonally at different distances from the mouth of the Bahía Blanca Estuary. To characterize the morphodynamic state of the beaches, the Dean parameter (Ω) was calculated. Multivariate analyses were used to assess benthic community structures and their relationships with physical variables. The two beaches located closest to the Bahía Blanca Estuary were classified as intermediate and those located further from the estuary as dissipative. Richness, diversity and biomass of intertidal macrobenthic communities varied with the SEH, increasing towards the dissipative beaches. However, total density was higher on intermediate beaches, possibly because of nutrient-rich silt-clay sediment input from the estuary, enabling them to maintain a higher density of organisms than dissipative beaches. The estuary acts as a moderator of habitat hardness, which together with the morphodynamic state of the beaches is an important factor in the structuring of the macrobenthic community along this coastal fringe.

Primer registro de Triatoma infestans (Klug) (Hemiptera: Reduviidae) asociado a nidos de loros barranqueros (Cyanoliseus patagonus) (Aves: Psittacidae); First record of Triatoma infestans (Klug) (Hemiptera, Reduviidae) associated with Burrowing Parrots nests (Cyanoliseus patagonus) (Aves: Psittacidae) Hernández, María Laura; Amelotti, Ivana; Lopez Pablo; Abrahan, Luciana Beatriz; Gorla, David Eladio; Catala, Silvia Susana Triatoma infestans es el vector más importante de la enfermedad de Chagas de la Argentina. Se cita por primera vez la presencia de T. infestans (Klug) (Hemiptera: Reduviidae) asociado a nidos de loro barranquero Cyanoliseus patagonus (Psittasiformes: Psittacidae) construidos en viviendas de adobe abandonadas. Se discuten las posibles implicancias de este hallazgo para la vigilancia entomológica del vector.; Triatoma infestans is the most important vector of Chagas disease in Argentina. We report for the first time the presence of T. infestans (Klug) (Hemiptera: Reduviidae) associated with burrowing parrot nests Cyanoliseus patagonus (Psittasiformes: Psittacidae) built on abandoned adobe houses. The possible implications of this finding are discussed, for entomological surveillance of the vector.

Democratization and School Governance: Two Cases in Latin America Miguez, Daniel Pedro This paper’s aim is to study the cultural perceptions of citizenship present in Brazil and Argentina by looking at the succession of democratic educational reforms that took place in both countries since the return of democracy and the first decades of the XXI century. In addition, the study tests the insights proposed Guillermo O’Donnel, who perceived that while Argentineans had an egalitarian perception of citizenship that sometimes resulted in anomic social relations, Brazilians had a more hierarchical conception that excluded significant majorities from the polity. The study is based on the analysis of the models of school governance proposed in official documents (laws, decrees and ministerial resolutions), showing that there are various kinds of asymmetry with varying degrees of legitimacy in the two countries. This reveals different perceptions of citizenship in Brazil and Argentina and leads to a nuanced confirmation of O’Donnel’s hypothesis.

Determination of the blocking temperature of magnetic nanoparticles: The good, the bad, and the ugly Bruvera, Ignacio Javier; Mendoza Zélis, Pedro; Calatayud, M. P.; Goya, G. F.; Sanchez, Francisco Homero A numerically solved two-level Stoner-Wohlfarth model with thermal agitation is used to simulate Zero Field Cooling (ZFC)-Field Cooling (FC) curves of monosize and polysize samples and to determine the best method for obtaining a representative blocking temperature TB value of polysize samples. The results confirm a technique based on the T derivative of the difference between ZFC and FC curves proposed by Micha et al. (the good) and demonstrate its relation with two alternative methods: the ZFC maximum (the bad) and the inflection point (the ugly). The derivative method is then applied to experimental data, obtaining the TB distribution of a polysize Fe3O4 nanoparticle sample suspended in hexane with an excellent agreement with TEM characterization.