La "autogestión" en SEGBA: entramado conceptual de una experiencia singular (1964-1973) Scodeller, Gabriela Noemi El artículo analiza el entramado conceptual de la experiencia de “autogestión” desarrollada en SEGBA entre 1973 y 1976, argumentando que la misma se gestó en diálogo con los diversos modelos de gestión entonces disponibles a escala internacional y donde el caso yugoslavo circuló temprana y fuertemente por el imaginario lucifuercista. Busca advertir en qué clave la misma fue entonces discutida por sus protagonistas, lo cual permite descubrir una profunda reflexión al interior del Sindicato Luz y Fuerza Capital Federal en relación al tema de la participación, a la vez que muestra distintas concepciones en disputa al interior del sindicato que la puso en marcha. Para ello se observan los distintos viajes e intercambios de los dirigentes sindicales y técnicos vinculados al mismo, a través de su prensa sindical.

Moral y estrategia en la teoría social de Erving Goffman; Morality and strategy in Erving Goffman’s social theory Gonnet, Juan Pablo En la formulación de una teoría del orden social, frecuentemente se entiende que los componentes estratégicos y morales de la acción social constituyen fuerzas antagónicas. En este sentido, la teoría de la interacción de Erving Goffman, al abordar simultáneamente ambas dimensiones, ha sido descrita como ambigua, contradictoria e incluso complementaria. En este texto se sostiene que dichas interpretaciones resultan inadecuadas en tanto no dan cuenta del modo en el que Goffman redefine el vínculo entre moral y orden social. A partir de la reconstrucción de esta conceptualización, se pretende hacer comprensibles las interrelaciones que guardan los hechos normativos con el actuar estratégico.; In the development of a theory of social order, it is often understood that the moral and strategic dimensions of social action are opposite forces. Thus, Erving Goffman’s interaction theory, which simultaneously approaches both dimensions, has been described as ambiguous, contradictory and even complementary. In this article it is argued that these interpretations are inadequate, as they do not account for the way in which Goffman redefines the link between morality and social order. Starting from a reconstruction of this conceptualization, this paper purports to explain the relationships between normative facts and strategic action.

La relación entre los puntajes del Inventario de Comunicación Mac-Arthur Bates y la vulnerabilidad social en los primeros años de vida: una revisión sistemática; The relationship between Mac-Arthur Bates Communication Inventory scores and social vulnerability in the early years of life: a systematic review Gómez, Florencia N.; Sosa, Guadalupe; Castrillón, Diego; Morales, Leandro J.; Gago Galvagno, Lucas Gustavo Se entiende a la vulnerabilidad social como una variable multidimensional que involucra una combinación de eventos, rasgos y/o procesos que constituyen adversidades potenciales para ejercer los derechos humanos o alcanzar objetivos en la comunidad. Se ha observado que las habilidades lingüísticas, fuertemente ligadas al éxito académico, difieren según el nivel socioeconómico del contexto de crianza. Los Inventarios de Desarrollo Comunicativo de MacArthur Bates (CDI) son instrumentos que evalúan el desarrollo de las competencias comunicativas durante la primera infancia a través del reporte de un cuidador primario. El objetivo de la siguiente revisión sistemática será indagar las correlaciones entre el entorno socioeconómico y las competencias comunicativas, medidas con el CDI, en los primeros tres años de vida. Se encontraron diferencias respecto del desarrollo del habla, la comprensión y expresión del lenguaje en niños/as inmersos en contextos vulnerables, principalmente en aquellos infantes de entre 18 a 24 meses, previo a la inserción a la escolaridad formal. Se concluye que el CDI es un instrumento sensible a las diferencias socioeconómicas familiares, y que se deben realizar más estudios en culturas diversas y durante los primeros años de vida, para generar políticas públicas que logren paliar las diferencias en el desarrollo cognitivo infantil.; Social vulnerability is understood as a multidimensional variable that involves a combination of events, features and processes that enhance potential adversities against the compliance of human rights and the fulfillment of goals in the community. It has been proved that linguistic abilities, strongly related to academic achievement, differ depending on the socioeconomic level of the raising context. e MacArthur’Bates Communicative Development Inventories (CDI) is a tool that assesses the development of communicative competences during the early childhood based on the primary caregiver report. e aim of the following systematic review will be to find the correlations between the socioeconomic environment and the communicative competences, assessed with the CDI, in the first three years of life. e data analysis showed that low income children aged 18 - 24 months presented differences in both, their speech development, and their comprehensive / expressive language skills. It is concluded that the CDI is an assessment tool which is sensitive to the environment’s socioeconomic differences. In addition, more studies should be developed in diverse cultures and during the first years of life, in order to develop public policies that can alleviate the existing differences in infants’ cognitive development.

El archivo (sonoro) como proceso; The (Sound) Archive as a Process Garcia, Miguel Angel En los últimos años las prácticas asociadas a los archivos han sido objeto de críticas y redefiniciones por parte de varias disciplinas. Aunque se trata de un escenario sumamente ecléctico, las discusiones convergen en asignarle al archivo un carácter procesual, inestable e inacabado. Bajo esta nueva perspectiva, que en alguna medida renuncia a ver el archivo como un conjunto de documentos, una institución que acoge y administra los documentos o un edificio donde los documentos son albergados, el término ‘archivo’ está ampliando considerablemente su polisemia y, a la vez, tiende a convivir con expresiones y vocablos tales como ‘práctica archivística’, ‘archivación’, ‘archivalización’, an-archive, ‘multiverso archivístico’, ‘poética del archivo’, archivalterity y ‘anarchivismo’, entre otros. El propó­ sito del artículo consiste en presentar los lineamientos generales de esta perspectiva y sopesar sus alcances a partir de la observación de cómo un conjunto de grabaciones realizadas a principios del siglo XX en Tierra del Fuego, por Charles Wellington Furlong, fueron repro­ ducidas por diferentes tecnologías, interrogadas desde distintas disciplinas y teorías, y oídas bajo diferentes condiciones acústicas y disposiciones auditivas. La revisión del caso a la luz de la concepción procesual del archivo conduce, finalmente, a abrir una discusión entorno a la pregunta ¿qué almacena el archivo? y, más precisamente, ¿qué almacena el archivo sonoro?; In recent years, the practices associated with archives have been subject to crit­ icism and redefinition by various disciplines. Although it is a highly eclectic scenario, the discussions converge in assigning to the archive a processual, unstable and incomplete qual­ ity. Under this new perspective, which to some extent rejects seeing the archive as a set of documents, an institution that hosts and manages documents or a building where docu­ ments are housed, the term ‘archive’ is considerably expanding its polysemy and, at the same time, tends to coexist with expressions and words such as ‘archival practice’, ‘archivalization’, ‘an-archive’, ‘archival multiverse’, ‘poetics of the archive’, ‘archivalterity’ and ‘anarchivism’, among others. The purpose of the article is to present the general outlines of this perspective and to weigh its scope from the observation of how a set of recordings made in the early twentieth century in Tierra del Fuego, by Charles Wellington Furlong were reproduced with different technologies, interrogated from different disciplines and theories, and heard under different acoustic conditions and aural dispositions. The review of the case in the light of the processual conception of the archive leads, finally, to a discussion around the question: what does the archive store? and, more precisely, what does the sound archive store?

The impact of neighbourhood crime on mental health: a systematic review and meta-analysis Baranyi, Gergö; Di Marco, Martín Hernán; Russ, Tom C.; Dibben, Chris; Pearce, Jamie Background: Growing evidence indicates that the residential neighbourhood contributes to the complex aetiology of mental disorders. Although local crime and violence, key neighbourhood stressors, may be linked to mental health through direct and indirect pathways, studies are inconclusive. This systematic review and meta-analysis aimed to synthetize the evidence on the association between neighbourhood crime and individual-level mental health problems. Method: We searched 11 electronic databases, grey literature and reference lists to identify relevant studies published before September 14, 2020. Studies were included if they reported confounder-adjusted associations between objective or perceived area-level crime and anxiety, depression, psychosis or psychological distress/internalising symptoms in non-clinical samples. Effect measures were first converted into Fisher's z-s, pooled with three-level random-effects meta-analyses, and then transformed into Pearson's correlation coefficients. Univariate and multivariate mixed-effects models were used to explore between-study heterogeneity. Results: We identified 63 studies reporting associations between neighbourhood crime and residents’ mental health. Pooled associations were significant for depression (r = 0.04, 95% CI 0.03–0.06), psychological distress (r = 0.04, 95% CI 0.02–0.06), anxiety (r = 0.05, 95% CI 0.01–0.10), and psychosis (r = 0.04, 95% CI 0.01–0.07). Moderator analysis for depression and psychological distress identified stronger associations with perceived crime measurement and weaker in studies adjusted for area-level deprivation. Importantly, even after accounting for study characteristics, neighbourhood crime remained significantly linked to depression and psychological distress. Findings on anxiety and psychosis were limited due to low number of included studies. Conclusions: Neighbourhood crime is an important contextual predictor of mental health with implications for prevention and policy. Area-based crime interventions targeting the determinants of crime, prevention and service allocation to high crime neighbourhoods may have public mental health benefits. Future research should investigate the causal pathways between crime exposure and mental health, identify vulnerably groups and explore policy opportunities for buffering against the detrimental effect of neighbourhood stressors.

Influence of multiple reflections on the transmission coefficients of uniaxial plane-parallel plates Caro, Germán Eduardo; Veiras, Francisco Ezequiel; Acosta, Eduardo Omar; Perez, Liliana Ines A study on the influence of multiple reflections on the transmission coefficients of uniaxial plane–parallel plates is presented. Two representative models are analyzed: one that considers only the first transmission, and a rigorous one, taking into account the multiple reflections within the plate. Modules, phases, and the interference between p and s transmitted fields are evaluated in a wide range of angles of incidence by means of three emblematic examples that illustrate the effects of thickness, birefringence, and optical axis orientation. For simplicity, whereas the optical axis can form an arbitrary angle with the interface, it is restricted to the plane of incidence. A complete theoretical framework is provided along with general reference guidelines derived from numerical examples.

The erosive power of the Malvinas Current: Influence of bottom currents on morpho-sedimentary features along the northern Argentine margin (SW Atlantic Ocean) Wilckens, Henriette; Miramontes, Elda; Schwenk, Tilmann; Artana, Camila; Zhang, Wenyan; Piola, Alberto Ricardo; Baqués, Michele; Provost, Christine; Hernández Molina, F. Javier; Felgendreher, Meret; Spieß, Volkhard; Kasten, Sabine Sediment deposits formed mainly under the influence of bottom currents (contourites) are widely used as high-resolution archives for reconstructing past ocean conditions. However, the driving processes of Contourite Depositional Systems (CDS) are not entirely understood. The aim of this study is to establish a clearer link between contourite features and the oceanographic processes that form them. The morphosedimentary characteristics of a large CDS were analysed together with the current dynamics along the northern Argentine continental margin. This study combines multibeam bathymetry, seismo-acoustic data, sediment samples, vessel-mounted Acoustic Doppler Current Profiler (VM-ADCP) data and numerical modelling of ocean currents. The contouritic features include large contourite terraces (La Plata Terrace, Ewing Terrace) and an abraded surface connecting the terraces, as well as smaller erosional and depositional features like moats, erosion surfaces on the Ewing Terrace, sediment waves and contourite drifts. Measured and modelled near-bottom currents are vigorous (up to 63 cm/s at 150–200 m above the seafloor) where abraded surfaces and moats are present, and relatively weak (below 30 cm/s) on the La Plata Terrace and the Ewing Terrace. Generally, bottom currents follow the upper and middle slope morphology. Decreasing velocity of water masses flowing northward leads to less erosion and finer sediment deposits. ADCP data and the hydrodynamic model show the formation of eddies near the seafloor which probably lead to the small erosion surfaces on the Ewing Terrace, even though it is mainly a depositional environment. Overall, this study contributes to a better understanding of the formation of CDS and can help future reconstructions of past ocean conditions based on sedimentary structures.

Uso y desuso del principio de no intervención: un análisis de la política exterior argentina entre 1983 y 2007; Uso e desuso do princípio da não intervenção: uma análise da política externa argentina entre 1983 e 2007 Miranda, Roberto Alfredo; Jiménez Grotter, Virgilio Uno de los ejes principales de la tradición diplomática argentina fue el haber sostenido el principio de no intervención en los asuntos internos de un Estado. Sin embargo, desde la recuperación democrática en 1983 hasta 2007, es posible observar que Argentina distó de tener la misma posición internacional en torno al citado principio. De manera que el propósito del presente trabajo es analizar las políticas exteriores de los gobiernos de Raúl Alfonsín, Carlos Menem y Néstor Kirchner, desde una perspectiva comparativa, para determinar el uso que cada uno de estos presidentes hizo del mencionado principio frente a algunas situaciones domésticas de países latinoamericanos. El análisis se enfocó en la variable decisión de la política exterior, y para ello -como unidad de observación- se consideraron las acciones desplegadas por ésta política en los casos del conflicto centroamericano de los ochenta, la situación cubana y las crisis de Bolivia de 2003 y de 2005. Como consecuencia de este enfoque, se concluye que el uso del citado principio respondió al interés particular de cada gobierno, en lugar de replicar la experiencia histórica de la política exterior argentina, es decir, la de sostener una orientación estatal homogénea.; Um dos principais eixos da tradição diplomática argentina era ter sustentado o princípio da não intervenção nos assuntos internos de um Estado. No entanto, a partir da recuperação democrática de 1983 a 2007, é possível notar que a Argentina estava longe de ter a mesma posição internacional em torno desse princípio. Assim, o objetivo deste trabalho é analisar as políticas externas dos governos de Raúl Alfonsín, Carlos Menem e Nestor Kirchner, de uma perspectiva comparativa, para determinar o uso que cada um desses presidentes fez do princípio supracitado diante de algumas situações domésticas nos países latino-americanos. O estudo comparativo concentrou-se na decisão variável da política externa, e para isso – como unidade de observação – as ações tomadas por essa política foram consideradas nos casos do conflito centroamericano dos anos oitenta, da situação cubana e das crises da Bolívia em 2003 e 2005. Em consequência desta abordagem, conclui-se que o uso do referido princípio respondeu ao interesse particular de cada governo, em vez de replicar a experiência histórica da política externa argentina, ou seja, a de sustentar uma orientação estatal homogênea.

Política y moral en la producción de inteligencia: Las clasificaciones y sus sentidos en los archivos de inteligencia en períodos democráticos en Argentina; Politics and morality in the production of intelligence: Classifications and their meanings in the intelligence archivesin democratic periods in Argentina Muzzopappa, María Eva; Schnyder, Maria Celeste Este trabajo analiza documentos del D2 de la policí­a de Santiago del Estero y de la oficina de inteligencia de una Base Aeronaval en Chubut con el objetivo de identificar sus clasificaciones para la identificación de actores y preguntarse, a partir de allí­, respecto del rol de los organismos de información e inteligencia durante los perí­odos democráticos. Este aspecto, que sigue siendo una de las deudas de la democracia argentina, fue materia de legislación en 2001 con la sanción de la Ley de Inteligencia Nacional 25.520. Sin embargo, el hallazgo de archivos militares y policiales que ocupan a este artí­culo dan cuenta de la continuidad de la práctica de investigación de antecedentes, reunión de información y producción de inteligencia por razones polí­ticas sobre ciudadanos e instituciones. Esto abre interrogantes en torno a la idea de que el sentido de los documentos responde exclusivamente a las funciones formales del organismo productor. Antes bien, deben ser considerados como artefactos sociales que encarnan y reproducen repertorios culturales polí­ticos de largo aliento, que forman parte de la llamada “baja polí­tica” pero que inciden en los procesos, conflictos y decisiones que se despliegan en la dimensión institucional de la polí­tica.; his paper analyzes documents of the D2 of theSantiago del Estero police and the intelligence office NavalAir Base in Chubut with the objective of identifying theirclassifications and meanings to ask, from there, about the role ofthe information and intelligence agencies during the democraticperiods. This aspect, which is still one of the debts of Argentinedemocracy, was the subject of legislation in 2001. However, thediscovery of military and police archives that are the subjectof this article shows the continuity of the practice of recordresearch, information collect and intelligence production forpolitical reasons on citizens and institutions. This raise questionsabout the idea that the meaning of the documents respondsexclusively to the formal functions of the producing agency.Rather, they should be considered as social artifacts that embodyand reproduce long-standing political cultural repertoires, which are part of the so-called "low politics" but have an impact on theprocesses, conflicts and decisions that unfold in the institutionaldimension of politics.

Digital Narratives of COVID-19: A Twitter Dataset for Text Analysis in Spanish Allés Torrent, Susanna; del Rio, María Gimena; Bonnell, Jerry; Song, Dieyun; Hernández, Nidia Digital Narratives of COVID-19 (DHCovid) offers a curated Twitter corpus of digital conversations about the Coronavirus pandemic. The dataset is collected through a script via Twitter’s Application Programming Interface (API) starting on April 24th, 2020, and stored on GitHub as an open access repository of tweet identifiers that can be consulted, downloaded, and reused by scholars interested in Natural Language Processing (NLP), topic modelling, and other quantitative methods. A stable version of the dataset has also been released through Zenodo. Twitter datasets are structured in three main collections: tweets in Spanish worldwide; geolocated tweets in six Spanishspeaking areas spanning North and Central America (Mexico, Columbia, Ecuador), South America (Argentina, Peru), and Europe (Spain); and geolocated tweets in English and Spanish from the greater Miami area in South Florida.

Ser migrante en Argentina en tiempos de COVID-19: Movilizar estrategias ante el mandato de inmovilidad Alvites Baiadera, Angélica Paola; Clavijo Padilla, Janneth Karime; Sciolla, Paula Daniela El objetivo de este artículo es analizar las experiencias de las y los migrantes que habitan en Argentina en tiempos de COVID-19, al develar el modo en que las medidas adoptadas en el contexto de pandemia han interpelado de forma diferencial a estas poblaciones en tanto no-nacionales. Para alcanzar este objetivo se trabaja sobre un conjunto de entrevistas telefónicas, notas de campo, registros de encuentros virtuales, documentos nacionales y de organismos internacionales. A partir del análisis se construyen tres momentos paradigmáticos de las experiencias de las y los migrantes, con relación a: 1) el cruce de fronteras en tiempos de cierre total; 2) la persistencia y profundización de las desigualdades sociales; 3) las luchas y estrategias migrantes para sortear las dificultades en el confinamiento.; The goal of this article is to analyze the experiences of migrants living in Argentina during the COVID-19 pandemic. In particular, we uncover the impact of the mobility restriction policies and the challenge they impose to different sectors of foreign communities. To this end, we leverage live telephonic interviews, field notes, recordings of virtual meetings, and documentation available from national and international authorities. Collected information enables the construction of three distinct paradigmatic phases of migrant experiences: 1) border crossing during curfew and strict lock-down; 2) persistence and deepening of social inequalities; and 3) strategies and struggles to overcome the confinement difficulties.

Rendimiento y calidad en trigo: Un simple cálculo para dosis de nitrógeno Ron, María de Las Mercedes; Martinez, Juan Manuel; Kiessling, Roberto Jurgen El método del balance simplificado para fertilización nitrogenada en base en trigo implica varias suposiciones. Las aproximaciones intentan reducir la naturaleza compleja de la nutrición del cultivo a un simple cálculo.

Determinants of unreported income in Latin American companies: a business perspective Pedroni, Florencia Verónica; Briozzo, Anahi Eugenia; Pesce, Gabriela This study aims to empirically identify factors associated with unreported income in Latin American registered firms. We use World Bank Enterprise Survey 2017 data from Argentina, Bolivia, Ecuador, Paraguay, Peru, and Uruguay. We find that the propensity of a company to underreport income increases when corruption, taxes, bureaucracy, regulation, justice, access to finance, and sector informality are considered an obstacle to business operations; and when firms are smaller, from the commercial sector, domestic owned, sell mainly in national markets, have at least one female owner or are from Bolivia. Otherwise, this probability decreases for companies that have certified financial statements or international quality certifications, and when political instability represents the greatest difficulty. This article provides updated information of business informality determinants in Latin America with very recent data from six countries, which is an opportunity to design specific development policies in the region.

Convalescent Plasma Therapy in SARS-COV-2 Infection, Experience in Tucumán Argentina: An Observational Study Chahla, Rossana; Agote, Felicitas; Medici, Natalia; Agudo, Gabriela; Farhat, Maria; Sandoval, María Rosario; De Gorostiza, Graciela; Valenzuela, Juan; Amicone, Nancy; Barrenechea, Guillermo; Aguilar, Mónica; Costas, Dardo; Walter, Sigler; Toledo, Roxana; Maldonado Galdeano, María Carolina; Cazorla, Silvia Ines; Chehin, Rosana Nieves; Ploper, Diego; Vera Pingitore, Esteban; Tomas Grau, Rodrigo Hernán; Perdigon, Gabriela del Valle; Peral, Maria de Los Angeles Background: Therapies based on different drugs and corticosteroids have been employed to stop the SARS-COV-2 virus infection. The administration of convalescent plasma (CP) is other therapy used to control COVID-19 disease. Aim: To evaluate the efficacy of the CP therapy on the recovery of SARS-COV-2 infection in 189 hospitalized patients who received this treatment during July to October 2020. Material and Methods: 189 patients with COVID-19 requiring hospitalization in theIntensive Care Unit (ICU) or mechanical ventilation, from the public hospital dependent on the Health Ministry of Tucumán, Argentina, were selected to receive plasma. The Convalescent Plasma to be use in the transfusion therapy, was selected according the nucelocapside specific IgG antibody titer, measured by Abbott Architect SARS-CoV-2 assay. Results: We observed that early administration of CP, between3 to 5 days after hospitalization, to patients with moderate disease, was associated with a decrease in the mortality. In 27 patients from the Intensive Care Unit which required mechanical ventilation and 28 patients that presented several comorbidities, plasma administration was effective in 14 and 60% respectively. Conclusion: The results suggest that the favorable effect of CP would be related with the the period of time when plasma wasadministered to hospitalized patients and the severity of the disease. Early administration was a critical point to decrease the deaths of SARS-COV-2 infected patients.

Del movimiento reformista a la insurrección: la izquierda paraguaya y el Nuevo Ideario Nacional (1929-1931); From the Reform Movement to Insurrection: the Paraguayan Left and the New National Ideary (1929-1931) Castells, Carlos Roberto Este trabajo se propone recuperar la historia del Nuevo Ideario Nacional (NIN), nombre que sintetiza un movimiento político de la izquierda paraguaya surgido a finales de la década de 1920 y de breve existencia, pero que representó una experiencia política original en el país, tanto en sus aspectos programáticos más generales como en la estrategia política utilizada. De acuerdo con ellos, se hace difícil encuadrar este fenómeno en alguna de las corrientes políticas clásicas (anarquistas, socialistas y comunistas), aunque, obviamente, encuentre parte de su raíz en ellas. Ubicado dentro de la heterogénea gama de experimentos y movimientos políticos latinoamericanos surgidos al calor del fenómeno de la Reforma universitaria iniciada en Córdoba en 1918, el NIN fue el espacio aglutinador de un nuevo radicalismo obreropopular que derivó en un movimiento insurreccional cuya acción más audaz fue la llamada Toma de Encarnación, el 19 de febrero de 1931, ciudad que por dieciséis horas fue convertida en “comuna libertaria”.; The objective of this paper is to recover the history of the New National Ideario (NIN), a name that synthesizes a political movement of the Paraguayan left that emerged in the late 1920s and of short existence, but which represents an original political experience in the country, both in its most general programmatic aspects as well as in the identified political strategy. According to them, it is difficult to frame this phenomenon in any of the classic political currents (anarchists, socialists and communists), although, obviously, it finds part of its root in them. Located within the heterogeneous range of Latin American political movements and experiments that emerged in the process of the University Reform that began in Córdoba in 1918, the NIN was the uniting space for a new worker-popular radicalism that led to an insurrectional movement whose most daring action it was called Toma de Encarnación, on February 19, 1931, a city that for sixteen hours was converted into a “libertarian commune”.

Las Quínoas oncoids: a new deposit of microbialites in the Salar de Antofalla (Catamarca, Argentina) Villafañe, Patricio Guillermo; Lencina, Agustina Inés; Soria, Mariana Noelia; Saona Acuña, Luis Alberto; Gómez, Fernando Javier; Alonso, Guido Ezequiel; Farias, Maria Eugenia The Salar de Antofalla (salt flat) is located in the Puna region of Catamarca, in northern Argentina. In this paper we report and provide the first descriptive data of Las Quínoas, a modern system of oncoids located in the western margin of the salt flat. Oncoids were studied by insitu logging, polished and thin sections analysis. In addition, the 16s rRNA genes of microbial mats associated with these oncoids were amplified and sequenced to characterize the microbial biodiversity. Oncoids present discoidal to subrounded morphologies and sizes up to 15 cm in diameter. They are scattered along channels, which originate from the groundwater springs of a wetland and enter the salt flat. Its macrostructure is concentric and composed by three zones: 1. A nucleus zone built by clastic material in a carbonate matrix. 2. A well-laminated zone around the nucleus that shows two types of mesostructures: concentrically stacked spheroids (SS-C) and randomly stacked hemispheroids (SS-R), both showing an alternation of dense and dark micritic laminae with light micritic to microsparitic laminae. 3. A poorly-laminated zone, in the outermost sector of oncoids, with two types of mesostructures too: a laminated mesostructure composed also of an alternation of dense and dark micritic laminae with light micritic to microsparitic laminae, and a non-laminated mesostructure composed of agglomerated and cemented clastic material within a calcareous matrix (wackestones-packstones). Regarding the microbial diversity, the analyzed oncoids in this work are mainly inhabited by Proteobacteria (ca. 37.5%), Bacteroidetes (ca. 25.0%), and in less proportion Planctomycetes, Actinobacteria and Cyanobacteria.

Compromiso e intención de abandono en adolescentes de selecciones nacionales argentinas: el papel de los agentes sociales y efectos del género; Engagement and intentions of drop-out in adolescents of Argentinean national teams: The role of social agents and gender effects Raimundi, María Julia; Celsi, Ignacio Agustín; Otero, Maria Carla; Schmidt, Vanina Ines; Castillo, Isabel Introducción/objetivo: El objetivo de esta investigación es examinar el poder predictivo de la percepción de los estilos interpersonales de entrenadores/as, padres y madres en el compromiso e intención de abandono de adolescentes deportistas argentinos de alto rendimiento, considerando el papel del género en esta relación. Método: Participaron 234 adolescentes de entre 12 y 16 años (M = 14.48, DT = 1.09) seleccionados para los Juegos Olímpicos de la Juventud —Buenos Aires 2018—, quienes cumplimentaron cuestionarios para la evaluación de las variables de interés. Resultados: Los varones perciben mayores niveles de compromiso que las mujeres y estas perciben mayor apoyo a la autonomía de la madre. El apoyo a la autonomía del entrenador tuvo mayor capacidad predictiva en el compromiso de los varones y en la intención de abandono del deporte de las mujeres. En ambos géneros, el efecto del apoyo a la autonomía del entrenador fue mayor que el de los padres. Conclusiones: Estos resultados muestran la importancia de los otros significativos en la participación deportiva y contribuyen al conocimiento de los factores que pueden favorecer el desarrollo positivo en deportistas adolescentes de alto rendimiento.; Introduction/Objective: This research aims to examine the predictive power of perceived interpersonal styles of coaches, fathers and mothers on engagement and intentions to drop-out of Argentinean high-performance adolescent athletes considering the role of gender in this relationship. Method: A total of 234 adolescents aged 12-16 years (M = 14.48, SD = 1.09) selected for the Youth Olympic Games -Buenos Aires 2018- participated in the study, who answered questionnaires assessing the variables of interest. Results: Males perceived higher levels of engagement than females, and females perceived higher autonomy support from the mother. Coaches’ autonomy support had greater predictive power on males’ engagement and females’ intentions to drop-out sport. In both genders, the effect of coach autonomy support was greater than parents. Conclusions: These results show the importance of significant others in sport participation and contribute to the knowledge of factors that may foster positive development in high-performance adolescence athletes.

Haplotypes traceability and genetic variability of the breeding population of pacu (Piaractus mesopotamicus) revealed by mitochondrial DNA de Freitas, Milena V.; Ariede, Raquel B.; Hata, Milene E.; Mastrochirico Filho, Vito A.; del Pazo, Felipe; Villanova, Gabriela Vanina; Mendonça, Fernando F.; Foresti, Fábio Porto; Hashimoto, Diogo T. The main objective of this study was to estimate the genetic diversity levels and haplotype traceability in pacu Piaractus mesopotamicus from the breeding program located in Brazil by analyses of the mitochondrial DNA control region (mtDNA). Moreover, broodstocks from eight commercial fish farms were used for comparative evaluation, four from Brazil (Br1-Br4) and four from Argentina (Ar1-Ar4). The descriptive results revealed 47 polymorphic sites and 51 mutations, which evidenced 34 haplotypes. Ten haplotypes were shared among fish farms and 24 were exclusive. The nucleotide diversity (π) ranged from 0.00031 to 0.01462 and haplotype diversity (Hd) from 0.125 to 0.868. The analysis of molecular variance (AMOVA) indicated high structure present in the analyzed stocks (FST = 0.13356 and ФST = 0.52707). The genetic diversity was high in most of the commercial broodstocks, especially those from Brazil. We observed seven haplotypes in the genetic breeding population, of which four were exclusive and three shared among the commercial fish farms. The genetic diversity was moderate (π = 0.00265 and Hd = 0.424) and considered appropriated for this breeding population of pacu. Our results provide support for the genetic diversity maintenance and mtDNA traceability of pacu commercial broodstocks.

Sex chromosomes in the Vizcacheras’ White-lipped frog, Leptodactylus bufonius (Anura, Leptodactylidae) Schneider, Rosio Gabriela; Ferro, Juan Martín; Reinko, Ivana Noelia; Boeris, Juan Martín; Cardozo, Dario Elbio; Baldo, Juan Diego Cytogenetic analyses were performed on specimens of Leptodactylus bufonius from different localities in Argentina. Mitotic chromosomes were studied with Giemsa and differential staining techniques (Ag-NOR, C-banding, and CMA3 /DAPI) and fl uorescence in situ hybridization with the 18S DNAr probe. All specimens showed karyotypes with 2n = 2x = 22 and FN = 44. Secondary constrictions were present in the long arm of chromosome pair 8, coincident with Ag-NOR and hybridization signals of the 18S DNAr probe. The C-banding technique evidenced an important amount of heterochromatin with a sex-linked pericentromeric band in the short arm of chromosome pair 4. This heterochromatic band was heteromorphic in males but present in both homologues of females, and it was CMA3 positive (DAPI negative) at fl uorescence staining. The occurrence of heteromorphic XY sex chromosomes in L. bufonius is the second known case in Leptodactylus and the fi fth within the speciose family Leptodactylidae.

AISYF: first national, prospective, multicenter study of young patients with stroke in Argentina; AISYF: primer estudio nacional, prospectivo y multicéntrico de pacientes jóvenes con ataque cerebral en Argentina Bonardo, Pablo; Leon Cejas, Luciana; Mazziotti, Julieta; Zinnerman, Alberto; Fernandez Pardal, Manuel; Martinez, Alejandra; Riccio, Patricia; Ameriso, Sebastian Francisco; Bendersky, Eduardo Daniel; Nofal, Pedro; Cairola, Patricia; Jure, Lorena; Sotelo, Andrea; Casas Parera, Ignacio Faustino; Sánchez Luceros, Analía Gabriela; Sposato, Luciano A.; Reisin, Ricardo C. Aproximadamente un 15% de todos los ataques cerebrovasculares afectan a pacientes jóvenes y su incidencia estaría en aumento. Existe escasa información sobre el ataque cerebral en esta población tanto en nuestro país como en Latinoamérica. El objetivo de nuestro estudio fue evaluar las características clínicas y los factores de riesgo de los adultos jóvenes con ictus en Argentina. Realizamos un estudio prospectivo y multicéntrico en adultos jóvenes (18-55 años) en Argentina, que presentaron un evento cerebrovascular dentro de los 180 días previos. Los subtipos de ictus se clasificaron según los criterios de TOAST. Se incluyeron un total de 311 pacientes (hombres 53.9%, edad media: 43,3 años). Los ataques cerebrovasculares isquémicos ocurrieron en el 91.8% (infartos cerebrales 82.6%, ataque isquémico transitorio 9.2%) y los eventos hemorrágicos correspondieron al 8.2%. Los factores de riesgo vascular más frecuentes (incluyendo los eventos isquémicos y hemorrágicos) fueron: hipertensión 120 (41%), tabaquismo 92 (31.4%), dislipidemia 81 (27.6%) y sobrepeso/obesidad: 74 (25.3%). Los subtipos de ictus isquémicos fueron: arteriopatía de gran vaso 12.3%, cardioembolismo 7.5%, oclusión de pequeña arteria 11.5%, otra etiología definida 27.1% y etiología indeterminada 41.6%. Los factores de riesgo vascular son muy frecuentes en los adultos jóvenes con ictus. Nuestros hallazgos subrayan que se requieren estrategias urgentes para la prevención primaria y secundaria del ictus en este grupo particular de pacientes en nuestro país.; Up to 15% of all strokes affect young patients and the incidence of ischemic stroke in this population is rising. Nevertheless, there is limited information of cerebrovascular events in this population both in our country and in Latin America. The aim of our study was to evaluate the clinical characteristics and risk factors of young adults with stroke in Argentina. This is a prospective, multicenter study of stroke in young adults (18 - 55 years) in Argentina. Patients presenting with a cerebrovascular event within 180 days were included. Stroke subtypes were classified according to TOAST criteria. A total number of 311 patients were enrolled (men 53.9%, mean age: 43.3 years). Ischemic strokes occurred in 91.8% (brain infarcts 82.6%, transient ischemic attack 9.2%) and hemorrhagic strokes in 8.2%. The most frequent vascular risk factors (including ischemic and hemorrhagic strokes) were: hypertension 120 (41%), smoking 92 (31.4%), dyslipidemia 81 (27.6%) and, overweight/obesity: 74 (25.3%). Stroke subtypes were: large artery disease 12.3%, cardioembolism 7.5%, small artery occlusion 11.5%, other defined etiology 27.1%, and undetermined etiology 41.6%. Our study demonstrates that vascular risk factors are very frequent in young adults with stroke. Our findings underline that urgent strategies are required for primary and secondary stroke prevention in this group of patients.