Enhancing the large-scale electric power systems to meet future demands considering the sustainable technologies Los sistemas eléctricos se están expandiendo hacia formas de producción más eficientes. Se están desarrollando varias estrategias de expansión para cubrir los aumentos de la futura demanda de electricidad. Se plantean objetivos como reducir las emisiones de gases de efecto invernadero, aumentar la eficiencia de las operaciones y lograr una participación más equitativa de los actores a cargo de las inversiones. Siguiendo esta premisa, este trabajo presenta un modelo multi-objetivo que ayuda en la toma de decisiones sobre el problema de la expansión de la generación eléctrica. El modelo considera puntos de vista más realistas que otros trabajos de la literatura. La gran mayoría de las partes interesadas en el ámbito estudiado están satisfechas con la presente propuesta. Se tienen en cuenta los costes de inversión, las emisiones de efecto invernadero y las tasas de contribución a la inversión. Además, se estudian rigurosamente los procedimientos reales de las etapas de generación y transmisión. De este modo se obtienen soluciones más cercanas a la realidad. El caso de estudio es el sistema eléctrico de Argentina. Los resultados obtenidos indican que las soluciones recomendadas son las más convenientes desde todos los puntos de vista. Constituyen un mix de la generación con tecnologías renovables y no renovables. El estudio de caso revela reducciones de emisiones de hasta el 25% y se puede lograr que los grupos sociales más vulnerables no tengan que financiar futuras ampliaciones del sistema.

Datos experimentales trabajo publicado: Adsorption of cationic surfactant as a probe of the montmorillonite surface reactivity in the alginate hydrogel composites Archivos de analisis de datos experimentales obtenidos por espectroscopias varias y difraccion de rayos X que dieron lugar a las figuras del paper publicado en RSC Advances (RSC Adv., 2022, 12, 35469, DOI: 10.1039/d2ra07405b)

A reassessment of Nemolestes (Mammalia, Metatheria): Systematics and evolutionary implications for Sparassodonta Rangel, Caio Cesar; Carneiro, Leandro M.; Tejedor, Marcelo Fabian; Paglarelli Bergqvist, Lilian; Oliveira, Edison Vicente Nemolestes and Procladosictis are Eocene sparassodonts of controversial affinities. Nevertheless, despite the poor preservation of their holotypes, several other specimens have been tentatively assigned to these genera, as exemplified by some isolated teeth from the Itaboraí and Laguna Fría faunas. Here, we revise specimens referred to Nemolestes and Procladosictis from Itaboraí, Laguna Fría and Ameghino’s collection. Nemolestes differs from Patene in its more reduced metaconid, and “carnassialized” m4 (with reduced talonid and talonid cuspids, except the hypoconulid), features that make it possible to identify specimens from Itaboraí and Laguna Fría as Nemolestes. This taxon occurred from the early Eocene (Itaboraian SALMA) to the middle Eocene (Casamayoran SALMA). Nemolestes represents the oldest known hypercarnivorous sparassodont. The inclusion of Nemolestes and Procladosictis in a comprehensive phylogenetic analysis recovered them in a polytomy as the sister taxa of Borhyaenoidea and a new unnamed clade that includes Lycopsis, Dukecynus, Hathliacynidae, Hondadelphys and Stylocynus. Nemolestes shares with these taxa, but not Patene, the presence of a “carnassialized” m4. Nemolestes differs from known borhyaenoids in the absence of a medially positioned protoconid and short anterolabial cingulid. Therefore, Nemolestes is an early lineage of Sparassodonta. “Procladosictis erecta” is a lower premolar of the unnamed clade, as it shows symmetric walls and a small precingulid. "Procladosictis erecta" should be, in fact, referred to Procladosictis. Our phylogenetic analysis indicates that during the early middle Eocene (Laguna Fría and La Barda faunas), the unnamed clade and Borhyaenoidea had already diverged. Therefore, the evolutionary history of these groups is older than previously thought.

A global experience‐sampling method study of well‐being during times of crisis: The CoCo project Scharbert, Julian; Reiter, Thomas; Sakel, Sophia; ter Horst, Julian; Geukes, Katharina; Gosling, Samuel D.; Harari, Gabriella; Kroencke, Lara; Matz, Sandra; Schoedel, Ramona; Shani, Maor; Stachl, Clemens; Talaifar, Sanaz; Aguilar, Natalia Maria Alejandra; Amante, Dayana; Aquino, Sibele D.; Bastias, Franco Emmanuel; Biesanz, Jeremy C.; Bornamanesh, Alireza; Bracegirdle, Chloe; Campos, Luís A. M.; Ceballos, Maria C.; Chauvin, Bruno; Choychod, Sopa; Coetzee, Nicoleen; Wolvaardt, George G.; Yalçın, Aslı; Bühner, Markus; van Zalk, Maarten; Back, Mitja D. We present a global experience-sampling method (ESM) study aimed at describing, predicting, and understanding individual differences in well-being during times of crisis such as the COVID-19 pandemic. This international ESM study is a collaborative effort of over 60 interdisciplinary researchers from around the world in the “Coping with Corona” (CoCo) project. The study comprises trait-, state-, and daily-level data of 7490 participants from over 20 countries (total ESM measurements = 207,263; total daily measurements = 73,295) collected between October 2021 and August 2022. We provide a brief overview of the theoretical background and aims of the study, present the applied methods (including a description of the study design, data collection procedures, data cleaning, and final sample), and discuss exemplary research questions to which these data can be applied. We end by inviting collaborations on the CoCo dataset.

Docentes, investigadorxs y becarixs del Instituto Académico Pedagógico de Ciencias Sociales de la Universidad Nacional de Villa María: Contribuciones al último Congreso de la Sociedad Argentina de Análisis Político (julio 2023); Profesors, researchers and scholarship holders from Academic and Pedagogical Department of Social Sciences, National University Villa Maria UNVM Kunz, Daniela Ivana; Páez, Gonzalo Enrique; Pagliarone, María Florencia; Romano Roth, Carla; Tomassini, María Virginia Desde los años 80, cuando la ciencia política en Argentina inició un proceso de institucionalización como disciplina académica fuertemente vinculada con la “agenda de la democracia” hasta la más reciente diversificación temática y metodológica del campo, los congresos de la Sociedad Argentina de Análisis Político (SAAP) han venido constituyendo uno de los principales espacios de participación y debate politológico en el país. Precisamente, en estas páginas realizamos una breve síntesis de las contribuciones de un grupo de docentes, investigadores y becarixs vinculados a la Licenciatura en Ciencia Política del IAPCS de la UNVM al último Congreso organizado por la SAAP en julio de 2023. Los trabajos se organizan en cuatro áreas temáticas: identidades políticas en clave subnacional, actores sociopolíticos en la Provincia de Córdoba, Relaciones Internacionales de América Latina y políticas públicas de seguridad.

La «Selva de Montiel» una singularidad biogeográfica de la provincia de Entre Ríos.; The “Selva de Montiel”, a biogeographic singularity of the province of Entre Ríos Reales, César Fabricio La denominación de Selva de Montiel fue mencionada por primera vez en 1864 por el médico francés y geógrafo de la Confederación Argentina Martín de Moussy, referenciando como Selva de Montiel a los reconocidos bosques montieleros en su Description géographique et statistique de la Confédération Argentine. Bosch (1978) califica el nombre de selva como un error muy generalizado proveniente de autores extranjeros como Martín de Moussy, del que luego se desprendieron consideraciones igualmente opuestas a la realidad. Aunque no es propiamente una selva (formación arbórea con varios estratos, notable altura y diversidad especifica en su composición), recibió esa caracterización por parte de antiguos pobladores dado el aspecto enmarañado de su espinoso bosque y la espesura de sus principales cursos de agua, que tuvieron influencia florística directa de la región de la Selva Paranaense, con estructuras y especies en común, como enredaderas, lianas, líquenes, orquídeas y claveles del aire que prenden desde los árboles. Estas formaciones boscosas serían denominadas Selva de Montiel, más por su baja transitabilidad que por un carácter selvático.

Literatura argentina y extranjería: variaciones Piglia sobre Hudson; Argentine literature and foreigners: Piglia variations on Hudson Bracamonte, Jorge Alejandro Los vínculos construidos por la poética de Ricardo Piglia con la figura, trayectoria y obra de William Hudson recorren distintas etapas, diferentes variaciones. Respecto a Hudson, resulta decisiva para Piglia la valoración que Ezequiel Martínez Estrada hace de la obra y trayectoria de Hudson. Ello se detecta desde los años de formación del joven escritor Piglia, durante la década de 1950. Luego, durante las décadas de 1960 y 1970, el gradual y radical posicionamiento teórico y político-literario de Piglia lo llevará a considerar en algún momento la figura de Hudson como la de un extranjero de notable obra, pero en definitiva exótico y que permanece en una mirada colonizada respecto a la cultura argentina. Finalmente, Piglia revaloriza al Hudson lector y escritor, clave para las literaturas y culturas argentina y anglosajona, quien también es un crítico radical del capitalismo. Este ensayo interroga los matices de esos diferentes momentos.; The links built by Ricardo Piglia´s poetics with the figure, career and work of William Hudson go through different stages, different variations. Regarding Hudson, the assessment that Ezequiel Martínez Estrada makes of Hudson´s work and career is decisive for Piglia. This has been detected since the formative years of the young writer Piglia, during the 1950s. Later, during the 1960s and 1970s, Piglia´s gradual and radical theoretical and political-literary position let him consider, at some point, Hudson´s figure as that of a foreigner of remarkable work, but definitely exotic and that remains in a colonized look with respect to Argentine culture. Finally, Piglia revalues the reader and writer Hudson, key to Argentine and Anglo-Saxon literatures and cultures, who is also a radical critic of capitalism. This essay interrogates the nuances of those different moments.

Exploring biocultural diversity in urban ecosystems: an ethnobiological perspective Albuquerque, Ulysses; Ladio, Ana Haydee; Duarte Almada, Emmanuel; Vandebroek, Ina; Pulido Silva, María Teresa; Stern da Fonseca-Kruel, Viviane Urban ecosystems differ from non-urban ones in the strong and rapid biocultural dynamics generatedby the interactions between people from different cultures, at large spatial and temporal scales and veryfast rates. This opinion piece explores the concept of urban ethnobiology as a critical field of researchthat investigates the complex and dynamic biocultural systems that exist in urban environments. Weargue that interactions between humans and other life forms in urban ecosystems are influenced by acharacteristic set of social, cultural, and political factors that are linked to urban environments, suchas infrastructure development, population density, and governance structures. We emphasize the needfor an interdisciplinary approach that brings together experts from different fields to study the inherentcomplexity of these systems. By examining the sociocultural dynamics that shape the way urbanbiodiversity is perceived, used, and managed, we can gain deeper insights into the different dimensionsof socio-cultural biodiversity in urban areas.

Procesos de lucha obrera en el ex ingenio San Pablo (Tucumán), 1920-1965; Processes of workers’ struggle in the former San Pablo sugar mill (Tucumán), 1920-1965 Gianfrancisco, Maria Soledad; Campi, Daniel Enrique A. Los interrogantes que orientan estainvestigación sobre la experiencia de lalucha obrera en el ingenio San Pablo(Tucumán) entre 1920 y 1965 se centranen los procesos de toma de concienciade los trabajadores sobre sus derechos,los modos de manifestar sus demandasy la consolidación de una potente culturasindical. Metodológicamente se hacombinado la consulta de fuentes editas einéditas con entrevistas a ex trabajadores.; The questions that guide this research on the experience of workers’ struggle in the San Pablo sugar mill (Tucumán) between 1920 and 1965 focus on the processes of raising workers’ awareness about their rights, the ways of expressing their demands and the consolidation of a powerful union culture. Methodologically, the consultation of published and unpublished sources has been combined with interviews with former workers.

Ángel Guido, rector de la Universidad Nacional del Litoral (1948-1950): La pregunta por la emancipación en algunos de sus textos olvidados; Ángel Guido, Rector of the National University of Litoral (1948-1950): Exploring the Quest for Emancipation in his Overlooked Texts Antequera, María Florencia Algunos textos olvidados –esto es, poco o nulamente transitados por la crítica–, discursos proferidos por el arquitecto e ingeniero Ángel Guido (Rosario, 1896-1960) con motivo de su asunción como rector de la Universidad Nacional del Litoral (1948-1950) y un ramillete de materiales provenientes de sus disquisiciones estéticas, históricas y artísticas, sirven para examinar un interrogante fructífero –por productivo y recurrente– en su escritura y en su ideal americanista: la búsqueda de la emancipación. En efecto, al poner en diálogo materiales heteróclitos de su producción intelectual de fines de la década del cuarenta –textos y algunas imágenes– entendemos que estas textualidades de diverso registro y calibre bien pueden echar luz no solo sobre su singular búsqueda de un arte emancipado, sino que también pueden contribuir a bosquejar sus poco conocidos vínculos con el peronismo y, de este modo, ampliar aquello que se entiende por obra intelectual de Guido, auscultando un inexplorado episodio de la vida cultural de la primera mitad del siglo veinte en Argentina.; From some forgotten texts by the architect and engineer Ángel Guido (Rosario, 1896- 1960), including discourses as rector of the Universidad Nacional del Litoral (1948-1950) and some materials from his aesthetic, historical and artistic disquisitions, we discuss a productive and recurrent question in his writing and in his Americanist ideal: the pursuit of emancipation. Through the juxtaposition of diverse materials from his intellectual production of the late 1940s - texts and some images - we understand that these textualities may illuminate his singular search for an emancipated art and his links with Peronism. Furthermore, this paper sheds light on an unexplored episode in the cultural landscape of Argentina in the first half of the twentieth century, thus expanding our understanding of Guido's intellectual contributions."

¿Qué arte y a qué artistas valoraron y homenajearon los diputados nacionales en la Argentina de entreguerras?; Honored Artists and appreciated Art in Argentinean Chamber of Deputies during the Interwar Period Bisso, Andres El presente artículo analiza los diferentes homenajes dados a los artistas en la Cámara de Diputados de la Nación durante el período de entreguerras. El entrecruzamiento de dichos eventos con otros proyectos y declaraciones producidos en relación con el arte nos sirve para comprender mejor tanto la conceptualización de los legisladores acerca de la cultura “popular” y las formas masivas de su difusión como, asimismo, precisar las características que mostró el proceso de “democratización” y “modernización” del canon patrio en dicho período.Palabras claves: Cámara de Diputados, arte, artistas, período de entreguerras.; This article analyses the homages given to artists in the Argentinean Chamber of Deputies during the Interwar Period. This approach –accompanied with crossed references– will be useful to detect changes and permanence in deputies’ conceptions on “popular” and “mass” cultures. In addition, this text describes the streams of Interwar Period ideas that allowed some “democratization” and “modernization” forms relative to the patriotic canon.

Trabajar en Plataformas en Argentina: Usos y valoraciones de esta nueva modalidad de trabajo; Work on Platforms in Argentina: Uses and valuations of this new work modality; Trabalhar em Plataformas na Argentina: Usos e avaliações desta nova modalidade de trabalho Longo, Julieta; Busso, Mariana; Fernández Massi, Mariana El objetivo de este artículo es analizar el trabajo en plataforma en Argentina como alternativa escogida por un segmento de la fuerza de trabajo. Para ello se indagarán los usos y valoraciones que quienes allí se desempeñan hacen de este tipo de trabajo. Con el objetivo de visibilizar situaciones antagónicas que están detrás del fenómeno de la economía de plataformas, seleccionamos dos casos que responden a distintos tipos de servicios: de reparto (entrega a domicilio) y de diseño gráfico. Asimismo, la fuerza de trabajo que congregan presenta características diversas en función a la complejidad de la tarea desempeñada. Mientras que las plataformas de reparto ofrecen servicios físicos de complejidad baja, las de diseño brindan servicios virtuales de media y alta calificación. El análisis se basa en datos primarios, que responden a una estrategia metodológica cualitativa. Se realizaron entrevistas en profundidad a trabajadores y trabajadoras de ambos tipos de plataforma en dos ciudades (Ciudad Autónoma de Buenos Aires y La Plata). El principal aporte radica en identificar y sistematizar distintos usos y valoraciones del trabajo de plataformas en Argentina, lo cual permite echar luz sobre los motivos por los que se escoge desempeñar esta actividad laboral.; The aim of this article is to analyse platform work in Argentina as an alternative chosen by a segment of the workforce. To this end, we explore the uses and valuations that those who work there make of this type of work. With the aim of making visible antagonistic situations that lie behind the phenomenon of the platform economy, we select two cases related to different types of services: delivery (home delivery) and graphic design. Likewise, the workforce they bring together has different characteristics depending on the complexity of the task performed. While delivery platforms offer physical services of low complexity, design platforms offer virtual services of medium and high qualification. The analysis is based on primary data, which respond to a qualitative methodological strategy. We conducted indepth interviews with workers from both types of platforms in two cities (Buenos Aires City and La Plata). The main contribution lies in identifying and systematising different uses and valuations of platform work in Argentina, which allows us to shed light on the reasons for choosing to carry out this work activity.; O objetivo do artigo é analisar o trabalho em plataformas digitais na Argentina como alternativa escolhida por um segmento da força de trabalho. Com esse fim, serão pesquisados os usos e as valorações que as pessoas que ali trabalham fazem dessa modalidade de trabalho. Com o objetivo de tornar visíveis situações antagônicas que estão por trás do fenômeno da economia de plataformas até no mesmo território, selecionamos dois casos que oferecem diferentes tipos de serviços: delivery e design gráfico. Da mesma forma, a força de trabalho que eles congregam tem características diversas dependendo da complexidade da tarefa desempenhada. Enquanto as plataformas de entrega oferecem serviços físicos de baixa complexidade, as plataformas de design oferecem serviços virtuais de média e alta qualificação. Metodologicamente a análise baseia-se em dados primários, que respondem a uma estratégia qualitativa de investigação. Foram realizadas entrevistas em profundidade com trabalhadores de ambos tipos de plataformas em duas cidades (Cidade de Buenos Aires e La Plata). A principal contribuição está em identificar e sistematizar diferentes usos e valorizações do trabalho em plataformas digitais na Argentina, o que contribui para a compreensão das motivações que os trabalhadores têm ao escolher essa atividade laboral.

The spatial dimension in university-social environment interactions: A proposal for the Argentine case; A dimensão espacial das interações universidade-entorno: Uma proposta para o caso argentino; La dimensión espacial de las interacciones universidad-entorno: Una propuesta para el caso argentino Sánchez Macchioli, Pablo; Di Bello, Mariana Eva; Soca, Fernanda Andrea This article analyzes how the spatial dimension is incorporated in interactions between universities and their environments, based on three ideal-types of interaction: scientific-technological poles, the establishment of networks, and the university as a locale. This work is based on a systematic analysis of specialized literature and fieldwork that included 120 interviews carried out across four Argentine universities between 2016 and 2021. The main findings indicate that spatial dimension is traditionally understood as a surface where actions take place; we propose to think of space in university–social environment interactions as a product of the different situations of interaction that is contingent and enables or restricts the possibilities of generating lasting impacts.; Este artigo analisa a forma como a dimensão espacial é incorporada nas interacções que têm lugar entre as universidades e os seus ambientes, a partir de três modalidades-tipo de interação: pólos científico-tecnológicos, redes e a universidade como sede. O trabalho baseia-se numa análise sistemática da literatura especializada, e no trabalho de campo em quatro universidades argentinas que envolveu a realização de 120 entrevistas entre os anos de 2016 e 2021. As principais conclusões indicam que, a partir das concepções mais tradicionais, a dimensão espacial não é complexificada, mas é entendida uma superfície onde as ações têm lugar. Pelo contrário, nas interacções universidade-ambiente, propomos pensar o espaço como um produto das diferentes situações de interacção, que é contingente e que permite ou restringe as possibilidades de gerar impactos duradouros nos ambientes das universidades.; El artículo analiza la forma en que se incorpora la dimensión espacial en las interacciones que se producen entre las universidades y sus entornos, a partir de tres ideales-tipos de interacción: los polos científico-tecnológicos, el establecimiento de redes y la universidad como sede. El trabajo se basa en un análisis sistemático de literatura especializada, y en un trabajo de campo en cuatro universidades argentinas que implicó la realización de 120 entrevistas entre los años 2016 y 2021. Los principales hallazgos revelados indican que desde las concepciones más tradicionales, la dimensión espacial no aparece complejizada, sino como una superficie donde discurren las acciones. Por el contrario, en las interacciones universidad-entorno proponemos pensar al espacio como un producto de las distintas situaciones de interacción, que es contingente y que habilita o restringe las posibilidades de generar impactos duraderos en los entornos de las universidades.

Entanglement in the quantum spherical model: a review Arias, Raúl Eduardo; Wald, Sascha; Alba, Vincenzo We review some recent results on entanglement in the Quantum Spherical Model (QSM). The focus lays on the physical results rather than the mathematical details. Specifically, we study several entanglement-related quantities, such as entanglement entropies, and logarithmic negativity, in the presence of quantum and classical critical points, and in magnetically ordered phases. We consider both the short as well as the long-range QSM. The study of entanglement properties of the QSM is feasible because the model is mappable to a Gaussian system in any dimension. Despite this fact the QSM is an ideal theoretical laboratory to investigate a wide variety of physical scenarios, such as non mean field criticality, the effect of long-range interactions, the interplay between finite-temperature fluctuations and genuine quantum ones.

Row spacing and phosphorus use efficiency in no-tillage maize Barbieri, Pablo Andres; Echeverria, Hernan; Sainz Rozas, Hernan René; Andrade, Fernando Héctor Reduced row spacing has shown to increase maize (Zea mays L.) nitrogen (N) use efficiency, but little is known about it effects on phosphorous (P) use efficiency (PUE). The objective of this study was to evaluate the PUE of maize under reduced row spacing and varying N regimes. No till maize was grown in Balcarce, Argentina, during two growing seasons using three rows spacing (35, 52, and 70 cm) and three N rates (0, 90, and 180 kg N ha−1). Shoot dry matter (DM), grain yield, and accumulated P content were determined. At V6 and R6 growth stages, the P use efficiency (PUE = g aboveground DM or grain yield per g P available) and it components P utilization efficiency (PUTE = g aboveground DM or grain yield per g P uptake), and P uptake efficiency (PUPE = g P uptake/g P available) were determined. N rate and narrower rows increased total DM, grain yield, and accumulated P content. Phosphorous concentration, PUTE, PUPE and PUE were not affected by row spacing or N rate. The present study showed that row spacing did not affect P use efficiency in no till maize when the soil P availability was adequate.

Lenguajes del exceso en la nouvelle phénoménologie française: JeanLuc Marion y Claude Romano; Languages of excess in the nouvelle phénoménologie française: JeanLuc Marion and Claude Romano Pizzi, Matías Ignacio El presente trabajo analiza el problema del lenguaje en dos pensadores de la nouvelle phénoménologie francesa: Jean-Luc Marion y Claude Romano. Proponemos agrupar estas consideraciones bajo la noción de “lenguajes del exceso”. En relación a Marion, reuniremos sus diversas formulaciones sobre este tema bajo la idea de lo que denominaremos “lenguaje de la saturación”. El elemento central aquí será su recepción del neoplatonismo cristiano (Dionisio Areopagita y Nicolás de Cusa), la cual le permite formular un lenguaje para nombrar los fenómenos saturados. En cuanto a Claude Romano, aunque ajeno a la tradición del neoplatonismo cristiano, sostendremos que su propuesta fenomenológico-hermenéutica está al servicio de la búsqueda de un lenguaje que pueda denominar el acontecimiento. En ambos casos, los autores pretenden describir fenómenos que exceden el ámbito de los objetos.; This paper aims to analyze the problem of language in two thinkers of the French nouvelle phénoménologie: Jean-Luc Marion and Claude Romano. We try to show that the novelty of this tradition consists in showing that the language of phenomenology can be explored from a non-predicative dimension. For this, we propose to group these proposals under the notion of “languages of excess”. In relation to Marion, we will group his various formulations on this subject under the idea of what we will call “language of saturation”. The central element here will be his reception of Christian Neoplatonism (Dionysus the Areopagite and Nicholas of Cusa), which allows him to formulate a language to name saturated phenomena. As for Claude Romano, although outside the tradition of Christian Neoplatonism, we will maintain that his phenomenological-hermeneutic proposal is at the service of the search for a language that can name the event. In both cases, they intend to describe phenomena that exceed the scope of objects.

Variable retention harvesting and climate variations influence over natural regeneration dynamics in Nothofagus pumilio forests of Southern Patagonia Rodriguez Souilla, Julian; Cellini, Juan Manuel; Lencinas, María Vanessa; Roig, Fidel A.; Chaves, Jimena Elizabeth; Aravena Acuña, Marie Claire Alejandra; Peri, Pablo Luis; Martínez Pastur, Guillermo José Natural regeneration is a key process to sustain structure, function, and composition in harvested forests over time. Variable retention harvesting system is a strategy that maintains a high level of heterogeneity in managed stands for multiple ecosystem services, which provides different micro-environmental conditions for natural regeneration that respond differently according to climate variations. The objective was to determine the influence of remnant over story on the dynamics of Nothofagus pumilio natural regeneration in forests managed under variable retention in the medium term (0 to 16 years-after-harvesting, YAH) and its interaction with climate variables. Recruitment period, survival, seedling bank of pre- and post-harvesting periods, regeneration age and heights were determined at permanent plots under three different harvested forest conditions (1: AR = aggregated retention, 2: DRI = dispersed retention under the influence of AR, 3: DR = dispersed retention without influence of AR) and one primary forests (PF) as a control (4 treatments × 6 replicates × 3 areas × 16 YAH). Height growth rates were associated to combined occurrence of hemispheric modes (ENSO and SAM) that influence over climate variations. Results showed different regeneration dynamics according to remnant forest over story: (i) a recruitment stage occurred during the first 4 YAH; (ii) 67,000 and 33,000 individuals ha- 1 for DRI and DR established respectively, with 15,000 individuals ha- 1 higher than 130 cm height at 16 YAH; (iii) equal density proportion of pre- and post-harvesting saplings between treatments (DRI and DR); (iv) significant differences in regeneration heights among treatments from 3 to 16 YAH, which were higher at DRI and DR, reaching to 130 cm height at 16 ± 1 years of age. Saplings height growth reacted favourably to higher mean temperatures associated with positive SAM and ENSO. These results reflect a successful and resilient natural regeneration process for N. pumilio where variable retention system to obtain timber products is below the thresholds of no-return, reacting differently according to climatic drivers by the presence of different structures of remnant over story. This provides useful information for forest management practices in the medium term, where the maintenance of stand heterogeneity (e.g., different types of over story retention) ensures successful and resilient regeneration to recover the stand original structure within a context of climate change.

Bioactivity of plant extracts against Atta sexdens (Hymenoptera: Formicidae) workers by ingestion Vidal Teixeira, Flávia; Souza,Talytha R. de Melo; Castellani, María A.; Camargo, Roberto da Silva; Forti, Luiz C.; Paula, Vanderlucia F. de; Silva, Aline; de Matos, Carlos Alberto O.; Nipato, Óscar B.; Moreira, Aldenise Alves; Sabattini, Julian Alberto The leaf-cutting ant Atta sexdens stands out as a pest of several crops of economic importance. The main control method for this species is the application of ant baits. However, one of the most used active ingredients in the ant baits, sulfluramid, was classified as an organic pollutant, highlighting the urgent need to seek new active ingredients with greater ecological and environmental safety. The present goal is to evaluate the bioactivity of botanical extracts in workers of the leaf-cutting ant A. sexdens by ingestion, aiming to select extracts with essential characteristics for use in toxic baits for the subsequent isolation of substances and prospection of insecticides. Insect survival in the first evaluation (24 h) was high in all treatments with extracts. Survival time varied between treatments, with mortality reaching maximum values between 10 and 20 days for most of the treatments. At 21 days, live ants were observed only in treatments T3 (M. maracasana-stem) and T4 (C. mastigophorus-bark), with survival of 10% and 3.3%, respectively, not significantly differing between them. The extracts of Metrodorea maracasana, Conchocarpus mastigophorus, Erythoxylum macrocalyx, and Erythoxylum plowmanii showed insecticidal activity against A. sexdens workers. The insecticidal activity of the species Erythoxylum macrocalyx, E. plowmanii, Metrodorea maracasana, and Conchocarpus mastigophorus against A. sexdens workers is shown for the first time. The studied extracts have potential for the fractionation and selection of substances responsible for insecticidal activity, allowing for the prospection of toxic baits.

Neosporosis in Argentina: Past, present and future perspectives Campero, Lucía María; Basso, Walter Ubaldo; Moré, Gastón Andrés; Fiorani, Franco; Hecker, Yanina Paola; Echaide, Ignacio Eduardo; Canton, German; Cirone, Karina Mariela; Campero, Carlos Manuel; Venturini, María Cecilia; Moore, Dadin Prando Neosporosis, caused by the protozoan Neospora caninum, was first diagnosed in Argentinean cattle in the 90´s. With a national bovine stock of approximately 53 million head, the cattle industry is socially and economically relevant. Severe economic losses have been estimated at US$ 33 and 12 million annually in dairy and beef cattle, respectively. Approximately 9% of bovine abortions in the Buenos Aires province are caused by N. caninum. In 2001, the first isolation of N. caninum oocysts from feces of a naturally infected dog was performed in Argentina and named as NC-6 Argentina. Further strains were isolated from cattle (NC-Argentina LP1, NC-Argentina LP2) and axis deer (Axis axis, NC-Axis). Epidemiological studies revealed a high distribution of Neospora-infections not only in dairy but also in beef cattle, with seroprevalence rates of 16.6–88.8% and 0–73%, respectively. Several experimental infection studies in cattle have been carried out, as well as attempts to develop effective vaccines to avoid Neospora-abortions and transmission. However, no vaccine has proven successful for its use in daily practice. Reduction of seroprevalence, vertical transmission and Neospora-related abortions have been achieved in dairy farms by the use of selective breeding strategies and embryo transfer. Neospora-infections have been also detected in goats, sheep, deer, water buffaloes (Bubalus bubalis) and gray foxes (Lycalopex griseus). Moreover, Neospora-related reproductive losses were reported in small ruminants and deer species and could be more frequent than previously thought. Even though diagnostic methods have been improved during the last decades, control of neosporosis is still not optimal. The development of new strategies including new antiprotozoal drugs and vaccines is highly needed. This paper reviews the information from the previous 28 years of research of N. caninum in Argentina, including seroprevalence and epidemiological studies, available diagnostic techniques, experimental reproduction, immunization strategies, isolations and control measures in domestic and non-domestic animals from Argentina.

Evolution of the Earth's magnetic field strength in northwestern Argentina during the last two millennia: Towards the improvement of south American geomagnetic paleosecular variation curve Goguitchaichvili, Avto; García Ruíz, Rafael; Greco Mainero, Mariano Catriel; Kravchinsky, Vadim; Pérez Rodríguez, Nayeli; Morales, Juan; Berkovich, Cesar A magnetic mineralogy and absolute geomagnetic intensity study was carried out on prehispanic ceramic fragments from the Southern Andes region (Northwest Argentina). Magnetic susceptibility vs. temperature curves and alternating field demagnetization treatments were applied to select the most suitable samples for the absolute archaeointensity experiments. A total of 66 samples were analyzed following the Thellier modified by Coe protocol, including cooling rate corrections and potential mitigation of the magnetic anisotropy effect. Thirty-eight samples (out of 66) belonging to nine pottery fragments yielded reliable absolute intensity determinations The new data, accompanied by associated radiocarbon ages, were integrated into previously published data in order to construct an improved paleosecular variation curve for South America. The highest quality data covers only the last 1000 years. The general variation patterns show good agreement with global geomagnetic prediction models. This updated regional curve may be used as the reference curve for archaeomagnetic dating in the major part of South America (Brazil, Argentina, Chile, Uruguay and Bolivia), even though caution should be paid for the areas and time periods poorly covered by data.