Health index for power transformer condition assessment: A comparison of three different techniques Zaldivar Sanchez, Diego Armando; Romero Quete, Andrés Arturo In practice, the condition state of Power Transformers (PT) is quantified by using Health Index (HI). This paper analyzes and compares three different state-of-the-art algorithms to compute HI. The first one uses a Weighted Sum Model (WSM), the second is based on a Fuzzy Inference System (FIS), and the third combines both techniques, i.e., WSM and FIS. These three approaches are tested in a PT fleet composed of 30 units. Results show that each approach produces different HI values for the same PTs. Therefore, decision making regarding the PT fleet will depend on the selected approach for HI calculation. This work proposes merging the knowledge involved in each analyzed approach by using a K-means clustering technique to overcome this drawback. This solution could help the asset manager to make adequate decisions regarding the maintenance scheduling of PT when there is uncertainty about the appropriate approach to be selected.

Challenges and opportunities of hard endosperm food grade maize sourced from South America to Europe Borras, Lucas; Caballero Rothar, Nancy Noemi; Saenz, Ezequiel; Seguí Rosales, Micaela; Gerde, Jose Arnaldo Food grade maize dedicated to dry milling is an ingredient used in everyday foods, such as breakfast cereals, snacks, baked goods, and beer. Argentina has developed a supply chain producing high quality food grade hard endosperm maize for national and international dry milling markets. In modern times, European countries uniquely source their imported hard endosperm food grade maize from Argentina. Here we describe some of the challenges and opportunities this centralized supply chain is facing. There is a 10–30% yield gap between regular dent and hard endosperm commercial hybrids, depending on the specific genotype and environment, and we anticipate it will continue increasing. Grain quality vs. yield trade-off is the most important challenge, and to cope with this issue the supply chain is slowly adapting to use food grade hybrids with higher physical field yields but slightly lower grain hardness than traditional ones. However, there is a clear opportunity to genetically manipulate grain hardness thanks to the known role of the specific proteins involved. Another opportunity is crop management optimization at the field level. Minimum advice is given to farmers other than genotype selection, leaving them with limited decision support regarding fertilizer or plant population, two management practices with significant grain quality effects. Opportunities also arise from market development based on the nutritional characteristics of this specialty grain (such as 122% higher β-branch carotenoids, 4% lower glycemic index of cooked flours because of lower starch digestibility, and 37% higher grain Zn than softer dent germplasm), or sustainability aspects of the supply chain. We highlight the capacity to track farmers through the current use of identity preserved (IP) programs detailing where, who, and how the grain was produced or impose any needed farming practice change. All these aspects are relevant for other food chains using maize dry milling products around the globe.

On the neural network flow of spin configurations Acevedo, Santiago Daniel; Lamas, Carlos Alberto; Costa, Alejo; Sturla, Mauricio Bernardo; Grigera, Tomas Sebastian We study the so-called neural network flow of spin configurations in the 2-d Ising ferromagnet. This flow is generated by successive reconstructions of spin configurations, obtained by an artificial neural network like a restricted Boltzmann machine or an autoencoder. It was reported recently that this flow may have a fixed point at the critical temperature of the system, and even allow the computation of critical exponents. Here we focus on the flow produced by a fully-connected autoencoder, and we refute the claim that this flow converges to the critical point of the system by directly measuring physical observables, and showing that the flow strongly depends on the network hyperparameters. We explore the network metric, the reconstruction error, and we relate it to the so called intrinsic dimension of data, to shed light on the origin and properties of the flow.

Molecular basis of the anchoring and stabilization of human islet amyloid polypeptide in lipid hydroperoxidized bilayers Espinosa Silva, Yanis Ricardo; Barrera Valderrama, Daniel I.; Carlevaro, Carlos Manuel; Llanos, Eugenio J. The molecular structure of membrane lipids is formed by mono- or polyunsaturations on their aliphatic tails that make them susceptible to oxidation, facilitating the incorporation of hydroperoxide (R-OOH) functional groups. Such groups promote changes in both composition and complexity of the membrane significantly modifying its physicochemical properties. Human Langerhans islets amyloid polypeptide (hIAPP) is the main component of amyloid deposits found in the pancreas of patients with type-2 diabetes (T2D). hIAPP in the presence of membranes with oxidized lipid species accelerates the formation of amyloid fibrils or the formation of intermediate oligomeric structures. However, the molecular bases at the initial stage of the anchoring and stabilization of the hIAPP in a hydroperoxidized membrane are not yet well understood. To shed some light on this matter, in this contribution, three bilayer models were modeled: neutral (POPC), anionic (POPS), and oxidized (POPCOOH), and full atom Molecular Dynamics (MD) simulations were performed. Our results show that the POPCOOH bilayer increases the helicity in hIAPP when compared to POPC or POPS bilayer. The modification in the secondary structure covers the residues of the so-called amyloidogenic core of the hIAPP. Overall, the hydroperoxidation of the neutral lipids modifies both the anchoring and the stabilization of the peptide hIAPP by reducing the random conformations of the peptide and increasing of hydrogen bond population with the hydroperoxidized lipids.

First genetic characterization of human cystic echinococcosis in Uruguay Figueredo, Elisa; Liporace, Vanessa; Mourglia Ettlin, Gustavo; Avila, Héctor Gabriel; Da Rosa, Daniel; Rosenzvit, Mara Cecilia Cystic echinococcosis is endemic and hyperendemic in Uruguay. The objective of this study was to determine the species and genotype of Echinococcus granulosus sensu lato in symptomatic patients with cystic echinococcosis who underwent surgery, together with the location and stage of the cysts. The study included 13 patients aged between 6 and 57 years old. Samples of cysts from these cases were analyzed using DNA extraction, polymerase chain reaction amplification and sequencing. The results revealed the presence of E. granulosus sensu stricto in all cases, with 12 samples belonging to the G1 genotype and 1 to the G3 genotype, suggesting that disease persistence might be related to the dog–sheep cycle. However, other intermediate hosts, such as cattle, could also be involved. Cysts were most frequently found in the liver, followed by muscle and other sites (e.g. pulmonary, vertebral, pelvic and cardiac); and stage CE1 was most frequently found, followed by CE2 and CE3b. Three cases occurred in children or adolescents, suggesting an active parasite cycle in at least some areas of the country. Since there is considerable diversity of E. granulosus sensu lato species and genotypes in South America, it is important to continue the present study in order to draw stronger epidemiological conclusions.

Trabajos preliminares sobre materiales constructivos coloniales en el Parque Provincial Ibatín; Preliminary works of colonial building materials in the Ibatín Provincial Park Borsella, Florencia Nuestro propósito es dar a conocer una serie de trabajos iniciados con el fin de explorar la vivienda colonial a partir del análisis de materiales constructivos coloniales en el sitio arqueológico de Ibatín. La vía experimental para conseguirlo ha pasado por el análisis macroscópico de restos arqueológicos y la identificación de microrestos vegetales asociados a sedimentos de los distintos objetos encontrados en sondeos y excavaciones.Creemos que estos trabajos permiten observar la utilización de los recursos tanto minerales como vegetales por parte de los pobladores españoles en un medio totalmente distinto al que conocían, y acercarnos a las técnicas de confección de los materiales constructivos. Si bien esta investigación es preliminar, los resultados obtenidos nos hacen pensar en la utilización por parte de los habitantes de Ibatín de recursos autóctonos propios de una región pedemontana en la que se desarrollaron las Yungas.; Our purpose is to present a series of works started in order to explore the colonial house based on the analysis of colonial construction materials in the archaeological site of Ibatín. The experimental way to achieve this has gone through the macroscopic analysis of archaeological remains, and the identification of vegetable micro-remains associated with sediments of the different objects found in archaeological excavations. We believe that these works allow us to observe the use of both mineral and vegetable resources by the Spanish inhabitants in a totally different environment from the one they knew and to get closer to the techniques of making construction materials. Although this research is preliminary, the results obtained make us think about the use by the inhabitants of Ibatín of native resources typical of a lowlands region in which the Yungas developed.

Meaning and symbolism of the Salamanca rite in Argentinean popular culture Palleiro, Maria Ines; Peltzer, María Eugenia Abstract:The aim of this presentation is to analyze an aspect of the Argentinean Cultural Heritage connected with oral traditional lore, transmitted from one generation to another according not only to the natural environment but also to the cultural landscape dealing with social beliefs which conform its cultural identity. Belief, understood as a modal certainty, whose true value depends on a personal agreement or a social consensus (Greimas & Courtés 1982) can be expressed in nightmares such as the one of the coven, which makes room for black rites as the one we deal with. Considering the rite as a praxis, whose distinctive feature is the sequential repetition of actions with performative effects on the context (Rappaport 1991), we deal with the ―Salamancarite‖, as worshiped in the Argentinean provinces of La Rioja and Santiago del Estero, which generates both legends, folktales and songs whose main topic is the deal with the Devil. As the Grimms have pointed out long ago, legends are folktales historically grounded, which cross the boundaries of reality towards the modal arenas of belief (Dégh 1976). Even grounded in local times and spaces, local rites such as the ―Salamanca‖ share symbols connected with universal folk narrative patterns, such as ATU tale type No. 330 ―The smith and the Devil‖.We focus the attention in the verbal explanation and iconic representation of this rite by the Argentinean craftsman Marino Cordoba, author of a series of ceramic statuettes regarding the Salamanca, exhibited both in the Argentinean folk museum of La Rioja and in the Devil Museum of Kaunas, Lituania as examples of Argentinean cultural heritage. We pay attention to how Cordoba narrates this rite with synechdotic logic of fragmentation (Briggs 2002) and visual metaphors connected with rhetoric of mystery belonging to the vernacular quechua-diaguita culture, which is part of Argentinean cultural heritage.

Los sátrapas persas de Alejandro: el imperio aqueménida como espacialidad social; Alexander's Persian Satraps. The Achaemenid Empire as Social Spatiality Nuñez, Javier Norberto El artículo sistematiza las respuestas de los sátrapas persas frente a la invasión macedonia. Se sostiene que la dimensión como espacialidad social del Imperio aqueménida resulta fundamental para comprender el desarrollo de ese Estado como el éxito de Alejandro y las acciones de los sátrapas. Así como la arena imperial integraba a élites de distintas regiones y centralizaba recursos en favor del monarca, la porosidad de sus límites sociales, así como el repertorio de relaciones entre soberano y súbditos, escapaban al control central y podían dar lugar a un reemplazo del Gran Rey reconfigurando esa espacialidad.; The article systematizes the Persian satrap's answers to the Macedonian invasion. It is sustained that social spatial dimension of the Achaemenid Empire is essential to understand the development of that State as well as Alexander's success and the satrap's actions. The imperial arena integrated different regions elites y centralized resources in the monarch's favour. But its social porosity and the repertoire of relationships between sovereign and subjects escaped from central control and could favour the replacement of the Great King though the reconfiguration of that spatiality.

Favores cruzados: Ecos del cambio institucional en la correspondencia entre Francisco de Prieto y Pulido (Buenos Aires) y Juan Antonio Ruiz Tagle (La Plata), 1768-1798 Jumar, Fernando Con la correspondencia mantenida entre 1768 y 1798 entre Francisco de Prieto y Pulido (Buenos Aires) y Juan Antonio Ruiz Tagle (La Plata) como eje se aborda la observación de la incidencia de los cambios institucionales en la relación que a su vez muestra de modo indirecto la elevación de Buenos Aires a centro de poder con la creación del Virreinato del Río de la Plata. En el camino, a través del contenido del intercambio, se observa el papel de las relaciones interpersonales en la administración de justicia y diversos aspectos del mundo de valores que transpiran de sus acciones y de sus dichos, que muestran sujetos férreamente anclados en la cultura jurisdiccional y aparentemente sin advertir que ese mundo se está desmoronando.; Using part of the correspondence (1768 and 1798) between Francisco de Prieto y Pulido (Buenos Aires) and Juan Antonio Ruiz Tagle (La Plata) as its axis, the work observes the incidence of institutional changes in the relationship between them. It also indirectly shows the elevation of Buenos Aires to the center of power with the creation of the Viceroyalty of the Río de la Plata. Along the way, through the content of the exchange, we observe the role of interpersonal relationships in the administration of justice and various aspects of the world of values that transpire from their actions and their sayings, which show subjects firmly anchored in the jurisdictional culture and apparently without realizing that this world is falling apart.

Experiencias docentes en pandemia: Las escuelas secundarias argentinas entre la virtualidad y el desafío del regreso a la presencialidad; Teaching experiences in pandemic: Argentine secondary schools between virtuality and the challenge of returning to attendance Iglesias, Andrea; Alterman, Denise; Giovanardi, Agostina Analizamos aquí un conjunto de narrativas de docentes de escuela secundaria durante la pandemia de COVID-19 en la Argentina. Los resultados muestran la transformación de su práctica ante la virtualidad forzada y la pérdida de la materialidad de la escuela. La institución aparece así como el lugar de “lo común” y de fortalecimiento de los vínculos en un contexto de incertidumbre.; We analyze here a set of narratives from secondary school teachers during the COVID-19 pandemic in Argentina. The results show the transformation of their practice in the face of forced virtuality and the loss of the materiality of the school. The institution thus appears as the place of “the common” and of strengthening links in a context of uncertainty.

Hacia una nueva primavera: Apuntes sobre la enseñanza del derecho en la universidad pública luego de la crisis del COVID-19; Towards a New Spring: Notes on Legal Education in Public Universities after COVID-19 Maisley, Nahuel La crisis causada por la pandemia de COVID-19 constituyó un desafío inaudito para la Facultad de Derecho de la UBA. En cuestión de semanas, la comunidad académica debió reinventarse y adaptarse a nuevas formas de enseñanza e investigación. Lo que antes parecía impensado (o al menos lejano) se volvió cotidiano, e interpeló nuestros roles, prácticas e instituciones de forma profunda, propiciando procesos de reflexión colectiva que exceden al desafío coyuntural de enseñar a distancia por un par de cuatrimestres. En este trabajo quiero contribuir a este debate aportando algunas experiencias, algunos datos, y algunas reflexiones. Basándome en una serie de entrevistas realizadas a estudiantes de mis cursos y en la experiencia de estos cuatrimestres, argumentaré que algunas de las prácticas que adoptamos de forma espontánea, intuitiva, y un poco desorganizada para resolver la crisis llegaron para quedarse, inexorablemente, y que eso puede ser una gran noticia, si las aprovechamos bien. Específicamente, subrayaré cuatro líneas de acción que sirvieron para que la educación jurídica funcione durante estos meses, y que creo que debemos fortalecer para el futuro: el uso de datos en la planificación de la enseñanza, el aprovechamiento de la tecnología, la construcción de una comunidad académica robusta, y la profesionalización de la enseñanza jurídica. A lo largo del trabajo, reflexionaré sobre estos puntos basándome en las enseñanzas de la generación del 80, un grupo de juristas que -liderados por Carlos Nino y Eugenio Bulygin- aprovechó la oportunidad de otra crisis para realizar cambios duraderos a nuestras instituciones y prácticas.; The crisis caused by the COVID-19 pandemic constituted an unprecedented challenge for the University of Buenos Aires Law School. In a matter of weeks, the academic community had to reinvent itself and adapt to new forms of teaching and research. What seemed previously unconceivable (or at least distant) became an everyday affair. This challenged our roles, our practices and our institutions in a profound manner, promoting a process of collective reflection which exceeds the current, temporary challenge of online teaching. In this article, I want to make a contribution to this debate sharing some experiences, some data, and some reflections. Drawing on a series of interviews with students from my courses and on the experience of these semesters, I will argue that some of the practices we spontaneously, intuitively, and somewhat haphazardly adopted to resolve the crisis are inexorably here to stay-and that that can be good news, if we take advantage of them appropriately. Specifically, I will highlight four lines of action that have served to make legal education work during these months, and that I believe we must strengthen for the future: the use of data in the planification of teaching endeavors, the use of technology, the construction of a robust academic community, and the professionalization of legal education. Throughout the piece, I will reflect on these points drawing on the ideas of the generation of the 80s, a group of jurists –led by Carlos Nino and Eugenio Bulygin– who took advantage of the opportunity of another crisis to make lasting changes to our institutions and practices.

Desigualdades territoriales en el acceso y permanencia a la educación secundaria: Aproximación a las condiciones sociales y educativas a nivel departamental en Argentina; Territorial inequalities in secondary education access and permanence: Approach to social and educational conditions at the departmental level in Argentina Herger, Natalia; Sassera, Jorgelina Silvia Las desigualdades socialmente estructuradas se manifiestan en los territorios a través de una distribución y accesos diferenciales de la población a los servicios públicos, los recursos y los distintos bienes. En Argentina, existe una articulación compleja entre las desigualdades derivadas de la segmentación socioeconómica y la concreción del derecho a la educación dando lugar a la diferenciación social en el acceso, permanencia y terminalidad de la educación secundaria. El artículo interpreta las disparidades en la educación secundaria de la población a través de una clasificación multidimensional de los departamentos al interior de las provincias, delineando áreas en las jurisdicciones que requieren de una mayor atención respecto a las condiciones de vida de la población y que actúan como el contexto social y económico para el cumplimiento del derecho a la educación. La mirada sobre las condiciones de vida considera dimensiones referidas al acceso a la educación y cultura, el hábitat y la vivienda, y algunas características económico-productivas; y se realiza una aproximación a las desigualdades educativas en el nivel secundario a través del análisis las situaciones de los departamentos respecto al acceso y permanencia y la demanda social del nivel. Finalmente, el artículo busca dar cuenta de aquellos territorios en los que se produce una retroalimentación entre desigualdades sociales y educativas.; Socially structured inequalities take place in territories where population face differential distributions and access to public services, resources and goods. In Argentina, there is a complex articulation between inequalities derived from socioeconomic segmentation and the realization of right to education, giving rise to social differentiation in access, permanence and completion of secondary education. The article interprets the educational attention of the population disparities through a multidimensional classification of the departments within provinces, outlining areas which require greater attention regarding living conditions that play as social and economic context for the fulfillment of the right to education. The outlook at living conditions considers dimensions regarding education and culture access, habitat and housing, and some economic-productive characteristics. Educational inequalities at secondary level are approached through the analysis of the situations of the departments regarding access and permanence and the social demand. Finally, the article seeks to account for those territories in which there is a feedback between social and educational inequalities.

La vinculación entre los sectores productivo y científico-tecnológico. El grupo fundador de INCUINTA y la utilidad social de los conocimientos (1990-2019); The link between the productive and scientific-technological sectors. The founding group of INCUINTA and the social utility of knowledge (1990-2019) Mendez Isla, Malena; Versino, Mariana Selva El presente trabajo aborda la trayectoria del grupo de investigadores/as fundador de INCUINTA del Instituto Nacional de Tecnología Agropecuaria (INTA). INCUINTA es una incubadora que busca contribuir a la transferencia de conocimientos a empresas de capital nacional y a la creación de empresas de base tecnológica desarrollando las áreas de interfase entre la investigación y la producción industrial. Este artículo analiza las vinculaciones establecidas por dicho grupo, perteneciente al Instituto de Virología e innovación tecnológica del INTA, con actores del sector productivo y del sector científico-tecnológico. El objetivo es abordar la relación entre estas interacciones y las formas de concebir la utilidad social de los conocimientos de los/as integrantes del grupo a lo largo del tiempo. Se utiliza una estrategia metodológica cualitativa a partir del análisis de los resultados de entrevistas realizadas y de fuentes documentales. Las vinculaciones son caracterizadas según cómo sea la circulación de flujos de conocimiento entre el grupo y las empresas y los/as científicos/as con los que interactúa. Se halló que el tipo de interacciones sostenidas por el grupo ocupó un lugar relevante en los cambios en la forma de concebir la utilidad social de los conocimientos.; This study deals with the founding group of researchers of INCUINTA of the National Institute of Agricultural Technology (INTA). INCUINTA is an incubator that seeks to contribute to the transfer of knowledge to companies with national capital and to the creation of technology-based companies by developing the interface areas between the research and industrial production. This article analyzes the links established by said group belonging to INTA's Institute of Virology with actors from the productive sector and the scientific-technological sector. The objective is to address the relationship between these interactions and the ways of conceiving the social utility of the knowledge of the group members over time. A qualitative methodological strategy is used based on the analysis of interviews and documentary sources. The links are characterized according to how knowledge flows between the group and the companies and scientists with whom the group interacts. It was found that the interactions sustained by the group occupied a significant place in the changes of social utility knowledge conception.

Nuevo registro de Bandurria Mora (Theristicus caerulescens) en la provincia de Santiago del Estero, Argentina; New record of Bandurria Mora (Theristicus caerulescens) in the province of Santiago del Estero, Argentina Laitan, María Guadalupe; Quiroga, Oscar Bernardo de Jesús; Neme, Andrea; Rueda, Marta Patricia; Barrera, Juan; Aguirre, Paula Micaela; Rueda, Carla Vanezza; Iturre, Marta Consolación La bandurria mora (Theristicus caerulescens) es un ave perteneciente a la familia Threskiornithidae con actividad relacionada con pequeños cuerpos de agua. Dentro de su área de distribución se encuentra la provincia de Santiago del Estero, la cual cuenta con cuatro registros puntuales de la especie. Se presenta un nuevo registro de Theristicus caerulescens. El avistaje y registro fotográfico se realizó en las cercanías de la comunidad campesina de Toro Pozo. Este registro aporta información importante, ya que refiere a una nueva localidad de presencia actual de la especie, y un nuevo aporte para conocer la distribución de la especie en territorio santiagueño. Para el contexto de la ecorregión del Chaco Seco argentino aporta documentación valiosa para los estudios de biodiversidad en sistemas con un modelo de uso del suelo que mantienen la estructura de bosque nativo como lo es el modelo campesino.; The plumbeous ibis (Theristicus caerulescens) is a bird belonging to the family Threskiornithidae with activity related to small bodies of water. Within its range is the province of Santiago del Estero, which has three specific records of the species. A new record of Theristicus caerulescens is presented. The sighting and photographic record was made in the vicinity of the peasant community of Toro Pozo, being considered an occasional species and rarely recorded in the province of Santiago del Estero. This record provides important information, since it refers to a new locality of current presence of the species, and a new contribution to know the distribution of the species in peasant territory. In the context of the Argentinean Chaco Seco ecoregion, it provides valuable documentation for the study of biodiversity in systems with a land use model that maintains the native forest structure, such as the peasant model.

Interior and up to the boundary regularity for the fractional g-Laplacian: The convex case Bonder, Julián Fernández; Salort, Ariel Martin; Vivas, Hernán Agustín We establish interior and up to the boundary Hölder regularity estimates for weak solutions of the Dirichlet problem for the fractional g−Laplacian with bounded right hand side and g convex. These are the first regularity results available in the literature for integro-differential equations in the context of fractional Orlicz–Sobolev spaces.

Freshwater fishes of the Río de la Plata: current assemblage structure Maiztegui, Tomás; Paracampo, Ariel Hernán; Liotta, Jorge; Cabanellas, Eva; Bonetto, Carlos Alberto; Colautti, Dario César Few studies have addressed the composition of fish assemblages of the freshwater Río de la Plata (RdlP) and have only been limited to species lists gathered over the last two centuries. As such inventories have never been reviewed or validated by fish sampling, the richness and structure of RdlP fish assemblage are poorly known. Hence, we conducted an exhaustive literature review and a fieldwork in six coastal points of Argentina to update the species composition and determine the hierarchical structure of the fish assemblage. From the 206 species registered in the literature, 48 were not confirmed, 13 were absent, five were taken as synonymized species, 29 were supported by literature and 107 were confirmed; one was an established exotic species, and three were a non-established exotic species. The findings reported here suggest that the fish assemblage currently comprises 141 species, including four new records. Analysis of fieldwork data in number and weight of fish captured resulted in an assemblage hierarchical structure of five dominant, 22 frequent, and 45 rare species; 16 dominant, 11 frequent, and 45 rare taxa, respectively. These results could be used as baseline to monitor, manage, and preserve neotropical fish species in their southern distribution boundary.; El conocimiento de los ensambles de peces del sector dulceacuícola del Río de la Plata (RdlP) es escaso y limitado a listas de especies de compilaciones realizadas en los últimos dos siglos. Como esos inventarios nunca han sido revisados o validados mediante muestreos de peces, el conocimiento respecto de la riqueza y la estructura de los ensambles del RdlP resulta deficiente. Para ordenar y mejorar la información acerca de la riqueza y estructura de los ensambles de peces del área se realizó una revisión bibliográfica y un muestreo de campo para actualizar la composición de especies y determinar la estructura jerárquica del ensamble de peces. De las 206 especies colectadas de acuerdo a la bibliografía 48 se categorizaron como no reconfirmadas, 13 como ausentes, cinco como especies sinonimizadas, 29 como soportadas por la literatura, 107 como confirmadas, una exótica establecida y tres exóticas no establecidas. Los resultados sugieren que el ensamble de peces actualmente está compuesto por 141 especies, incluyendo cuatro nuevos registros. El análisis de los datos en número y en peso de los peces colectados mostró 5 especies dominantes, 22 frecuentes y 45 raras; y 16 dominantes, 11 frecuentes y 45 raras, respectivamente. Los resultados de este trabajo pueden ser usados como línea de base para el monitoreo, manejo y conservación de las especies de peces neotropicales en su límite de distribución sur.

Passé présent. L’antagonisme politique et la chimère d’une communauté réconciliée dans la célébration des fêtes patriotiques en Argentine (2008-2019); The past in the present. Political antagonism and the chimera of a reconciled community in the celebration of national holidays in Argentina (2008-2019) Fernández, Mariano Néstor; Cingolani, Gastón Les célébrations des rituels civiques peuvent être le lieu d’une tension irréductible : en ayant pour fonction de commémorer la continuité de la Nation, et donc de certifier une forme de communauté réconciliée, ils sont aussi le moment d’expression de fractures sociales immédiates et de révision d’un récit de construction d’une Nation. Instances transcendantes, d’une part, moments immanents aux conflits qui marquent le fonctionnement des systèmes politiques du présent, d’autre part, et enfin, légitimation d’un projet national. Le présent article a pour but de comparer les célébrations de jour de l’Indépendance nationale argentine pendant deux gouvernements aux orientations idéologiques opposées, s’intéressant plus particulièrement à cette tension. D’une part, les deux mandats présidentiels de Cristina Fernández de Kirchner (2008-2015), une figure représentative du centre-gauche et habituellement pointée du doigt comme « populiste ». De l'autre, le gouvernement de Mauricio Macri (2015-2019), représentant des secteurs de droite et de centre droit, et auto-déclaré « anti-populiste ».; Celebrations of civic rituals can be the place of an irreducible tension : having the function of commemorating the continuity of the Nation, and therefore of certifying a form of reconciled community, they are also the moment of expression of immediate social fractures and revising a nation-building narrative. Transcendent instances, on the one hand; moments immanent to the conflicts that mark the functioning of the political systems of the present, on the other hand, and the legitimization of a national project, finally. This article aims to compare Argentina's National Independence Day celebrations during two governments with opposing ideological orientations, focusing on this tension. On the one hand, the two presidential terms of Cristina Fernández de Kirchner (2008-2015), a representative figure of the center-left and usually singled out as a « populist ». On the other, the government of Mauricio Macri (2015-2019), representing right-wing and center-right sectors, and self-declared « anti-populist ».

Recent advances on tectonics of the Andes and their foreland and southern North America, as part of special issues published in the Journal of South American Earth Sciences in the last three years (2019-20-21) Folguera Telichevsky, Andres; Vega, F.; Costa, Carlos Horacio; Calmus, T.; Dávila, F.; Alasino, Pablo Horacio; Limarino, Carlos Oscar; Martinez, F.; Paredes, José Matildo; Oriolo, Sebastián; Agusto, Mariano Roberto; Contreras Reyes, E.; Palazzesi, Luis; Euillades, Pablo Andrés; Carretier, S.; Hauser, N.; Rapalini, Augusto Ernesto; Kietzmann, Diego Alejandro This Editorial is based on the recent advances presented in the Special Issues related to tectonics across South America, released in the last three years. Its objective is to display the intense work focused on different lines of research of the Andean and Pre-Andean tectonic field and also to summarize key aspects extracted from these volumes in one single document. These Special Issues describe recent advances related to supercontinent Gondwana formation and posterior peripheral accretions during the Early Paleozoic, the instalment of coetaneous arc along the paleo-Pacific trench, the development of Late Paleozoic basins in the retro-arc region, Early Mesozoic extension related to the break-up of Gondwana, Late Cretaceous-Cenozoic closure of main retroarc depocenters, conformation of the proto-Andes, the growth of their structure and temporal destabilization during the Cenozoic, exhumation degree, paleoenvironmental changes experienced during these processes, and their neotectonic and seismological behavior. In the following paragraphs we will describe their general content and main achievements reached in these volumes.

Puntos de partida: etnografías colaborativas y comprometidas; Points of Departure: Collaborative Engaged Ethnographies; Pontos de partida: Etnografas colaborativas e engajadas Katzer Molina, Maria Leticia; Álvarez Veinguer, Aurora; Dietz, Gunther; Segovia, Yanett Cuando parecía que la palabra «etnografía» se diseminaba y diluía en un oleaje de teoricismo antropológico globalizante, en los últimos años viene retomando fuerza y peso propio, al punto de devenir como un umbral que trasciende y tensa el propio marco disciplinario de la antropología y el propio estatus de método. Esta dislocación ha movilizado una profunda discusión epistemológica, ética y política donde las nociones de «colaboración» y «compromiso» vertebran y tensan los procesos de subjetivación científica. En la actualidad, las etnografías colaborativas y comprometidas (en adelante ECC) configuran un dominio de saber en el que confluyen perspectivas, enfoques, alcances y proyecciones muy diversos. Contrario a propiciar un uso ligero y generalizado como por momentos parece advertirse, nuestro esfuerzo está puesto en brindarle especificidad, rigurosidad y profundidad. «Colaboración» conforma un dominio que liga una agentividad y vocabulario propio. «Etnografías» (en plural), «colaboración» y «compromiso social» configuran horizontes semánticos y horizontes de acción que nos llaman a reflexionar no ya desde recetas, manuales y programas sino desde preguntas: ¿Mediante qué formas, dispositivos y procesos construimos saberes y producimos sentidos socialmente? ¿Qué aristas debemos tener en cuenta para materializar la decolonización epistémica sin que esta quede reducida a una mera enunciación retórica? ¿Qué resultados concretos se proyectan en los ámbitos sociales donde desarrollamos las investigaciones? ¿Qué dimensiones epistemológicas y políticas prevalecen cuando reflexionamos sobre los procedimientos, decisiones, acuerdos y desacuerdos con los sujetos sociales partícipes en el proceso de investigación etnográfica?

La apariencia del fin del mundo puesta en imagen. Sobre la concepción de la fotografía en Walter Benjamin Baudagna, Rodrigo En este trabajo planteo la hipótesis de que las reflexiones de Benjamin sobre la fotografía presuponen la consideración de una dimensión destructiva inherente, en tanto representación del mundo como catástrofe y ruina. Primero abordo la relación entre el concepto de “huella” y la fotografía como escena del crimen. Luego analizo la descripción benjaminiana de una fotografía “constructiva” asociada a la destrucción y la alegoría. Finalmente, propongo la conexión entre la fotografía, la apariencia de ruina apocalíptica y la justicia.