Cuando organizar el trabajo es organizar la comunidad: Cooperativismo rural en la estepa de Río Negro Conti, Santiago; Sanchez, Suzette Melisa La historia productiva de la estepa patagónica desde la incorporación genocida perpetrada por el Estado Argentino a través de la Campaña del Desierto acompaña la lógica de concentración de tierras a partir de la configuración del latifundio. Tanto en la "línea sur" (o Región Sur) de Río Negro como en otros territorios estepáreos patagónicos, el modelo estancia, sumado a la incorporación del ferrocarril, y la producción ovina, dieron forma a un modelo productivo hegemónico y de gran escala basado en la extracción de fibra/pelo y su posterior venta, sin procesamiento o agregado de valor, a empresas metropolitanas (Buenos Aires o el exterior).Las condiciones de vida de la población rural, tanto aglomerada como dispersa, se han caracterizado desde los imaginarios locales-regionales a partir de la falta e la incapacidad propia para conducir su destino, incluso folclorizadamente, y acompañadas por la precariedad estatal en términos de infraestructura, servicios, comunicaciones; y también de derechos, considerando que recién en 1955 ocurrió la provincialización y, por ende, el fin de la etapa territorial.La organización cooperativa en esta región no puede disociarse de la historicidad del modelo de desarrollo y societal hegemónico, como una forma alternativa para la pequeña escala agropecuaria y artesanal, que aún en la actualidad se resignifica desde la salida de la dependencia del mercachifle.Nos proponemos describir y caracterizar aquellos aspectos sociales y productivos orientados al bienestar rural que fueron dinamizados a partir de la conformación de las cooperativas agropecuarias en parte de la línea sur rionegrina. A partir de aquí rastrearemos e identificaremos prácticas, valores y formas de socialización que se promueven desde dichas experiencias a la luz de un proceso histórico estructurante y en movimiento, y de múltiples coyunturas o acontecimientos (crisis políticas, crisis ambientales, migraciones, entre otros), tomando como referencia las distintas oleadas de conformación de cooperativas agropecuarias en la región (sus antecedentes, los 70s, los 80s y post-2000).El interés de la temática se centra en comprender de qué forma la conformación y el sostenimiento de las dinámicas cooperativas de organización del trabajo han incidido en las formas de socialización y vida comunitaria en la estepa de Río Negro, y poder comprender la historicidad de dicho proceso en el tiempo.Para abordar los objetivos presentados realizaremos entrevistas semiestructuradas y en profundidad a referentes e integrantes de distintas cooperativas de la línea sur, así como a distintos informantes clave (técnicos de agencias de desarrollo, referentes sociales, por ejemplo), y al análisis de documentos (publicaciones técnicas, noticias periodísticas, digestos y legislación provincial, entre otros). Para poder corroborar la exactitud o ampliar aspectos que surgieron en las entrevistas, en tanto carácter subjetivo de la memoria oral, que generalmente se presenta de modo fragmentario o parcializado, hemos consultado y generado cruces con fuentes bibliográficas primarias y secundarias.

Cellular and Molecular Mechanisms of Segmentation in Annelida: An Open Question Zattara, Eduardo Enrique; Weisblat, David Annelida is one of the three phyla presenting a segmented body plan, composed of repeated morphological units, and the only lophotrochozoan group with this type of organization. Furthermore, while arthropods and vertebrates also show segmental organization, annelids are the only phylum where segment formation continues well beyond embryonic development and into adult stages, either in normal posterior growth, axial regeneration or asexual reproduction. Annelids are also unique in that they can form segments through two quite different mechanisms: boundary-driven and lineage-driven segmentation. Boundary-driven segmentation, in which segments are defined by formation of molecular and fate boundaries between groups of cells, occurs broadly in embryonic development of arthropods and vertebrates, and during post-embryonic growth and regeneration of annelids. Lineage-driven segmentation, in which the components of each segment arise as the clonal descendants of individual cells generated from teloblastic growth, is known only from annelids and malacostracan crustaceans. Despite these outstanding features of annelid segmentation, very little is known about its developmental genetics or how much it varies across the phylum; however, the last decades have seen significant progress thanks to the emergence of new molecular techniques amenable for use in annelids. In this chapter, we introduce the annelid body plan, summarize early embryonic development and segment formation in four species spanning the diversity of the phylum, and discuss what little is known about the molecular basis of annelid segmentation.

Genetic assessment of the invasion history of Drosophila suzukii in Argentina de la Vega, Gerardo José; Corley, Juan Carlos; Soliani, Carolina Drosophila suzukii (Diptera: Drosophilidae) is a highly polyphagous fruit pest native to eastern Asia, which in the last decade had widely expanded its range and become a serious pest in the Americas and Europe. Invasion routes and the genetic diversity in populations of South America are poorly studied. Here, we compared the patterns of genetic variation of native populations and previously invaded regions (in America and Europe) with the genetic diversity of the recent invasion in Argentina. In addition, we explored the regional trade routes and volume of host fruits (Argentina, Brazil, Chile and Uruguay) to understand propagule pressure. We report for the first time a genetic assessment of the invasion history of D. suzukii in Argentina, noting genetic diversity at Cytochrome c oxidase subunit I gene fragment comparable with other recently colonized countries. In the years prior to the invasion into South America, Brazil imported large quantities of potential host fruits from different countries that had been previously invaded; likely Brazil might be the main source of D. suzukii in Argentina. This is emphasized by the fact that Argentina and Brazil share haplotypes; however, direct commercial pathway with the USA cannot be discarded, and additional sources of species arrivals are also possible. Our results suggest at least two invasion events could have occurred in Argentina, originating both from previously invaded areas (i.e., North America and Brazil). Our study provides information to improve our understanding of the routes and factors affecting the invasion of this economically significant pest in South America.

Acrylic-Casein Latexes with Potential Application as Adhesives Aguzin, Ana; Jerkovich, José Ignacio; Trucone, Julieta; Ronco, Ludmila Irene; Roque Javier Minari; Gugliotta, Luis Marcelino The replacement of monomers derived from petrochemical sources by biopolymers like proteins, together with the development of new materials with improved properties, have an increasing importance in industrial applications. In this context, the synthesis of acrylic-casein hybrid latexes was investigated through a low environmental impact strategy, such as the surfactant-free emulsion polymerization, with the aim of producing new industrial adhesives. Different aspects of the synthesis of hybrid latexes were addressed, such us i) the use of variable content of protein; ii) the control of grafting degree between polymers, using native casein (without chemical modification) or functionalized casein, and iii) the employment of a chain transfer agent to reduce molecular weights of the acrylic polymer. The effect of the analyzed variables on the polymerization kinetics, the degree of compatibility between polymers, and the application properties of the produced latexes as adhesives were investigated.

"Siempre nos miran a los del fondo": Zonificación del espacio y producción de identidades en la escuela secundaria.; They Always Look to the Back Row’: Zoning of Space and Identity Production in Secondary School; “Eles sempre olham para os que estão no fundo.”: Zoneamento espacial e produção de identidade no ensino médio García Bastán, Guido; Tomasini, Marina Edith En este artículo de investigación analizaremos la segregación hacia un grupo de jóvenes en el interior de un curso escolar en Córdoba (Argentina), a quienes sus compañeros nombraban despectivamente mediante el modismo local de brasas. Se estructura en dos partes: en la primera, explicitamos las principales referencias teóricas y consecuentes decisiones metodológicas empleadas para abordar los procesos de socialización, sociabilidad y construcción de identidades juveniles en la escuela desde una perspectiva cultural y dialógica. En la segunda, presentamos los principales hallazgos de la investigación. Comenzaremos aproximando al lector al fenómeno de la zonificación del espacio escolar para llegar a plantear dos cuestiones nodales: por un lado, la relevancia de dicha zonificación como artefacto identitario, y por otro, cómo en nuestro caso de estudio esta dimensión se yuxtapuso a otros recursos culturales, contribuyendo a la estabilización de la identidad devaluada del grupo estudiado, pero también dando márgenes a la emergencia de agenciamientos singulares en sus posicionamientos identitarios. Nuestros hallazgos abonan la necesidad de ampliar la mirada investigativa para entender el espacio escolar en su imbricación con otros entornos y mundos figurados.; In this research paper, we analyze the segregation of a group of youngsters within a school year in Córdoba, Argentina, whom their classmates disparagingly named “brasas”, an adjective from the local slang. The article is structured in two parts. In the first one, we explain the main theoretical references and consequent methodological decisions used to address the processes of socialization, sociability and construction of youth identities at school from a cultural and dialogic perspective. In the second part, we present our main findings. We will begin by approaching the reader to the phenomenon of the zoning of school space to reach two nodal statements. On the one hand, the relevance of such zoning as an identity device. On the other hand, how in our case study this dimension was combined with other cultural resources, contributing to stabilize the devalued identity of this group, but also allowing agency in their identity positions. Our findings suggest the need to broaden the investigative perspective to understand the school space in its imbrication with other spaces and figured worlds.; Neste artigo de pesquisa, analisaremos a segregação de um grupo de jovens dentro de uma aula em Córdoba (Argentina), a quem seus colegas de classe nomearam depreciativamente através da palavra local “brasas”. Está estruturado em duas partes: na primeira, explicamos os principais referenciais teóricos e consequentes decisões metodológicas utilizadas para abordar os processos de socialização, sociabilidade e construção de identidades juvenis na escola, sob uma perspectiva cultural e dialógica. Na segunda, apresentamos os principais achados da investigação. Começaremos aproximando o leitor ao fenômeno do zoneamento do espaço escolar para levantar duas questões nodais: por um lado, a relevância desse zoneamento como dispositivo de identidade e, por outro lado, como em nosso estudo de caso essa dimensão foi justaposta a outros recursos culturais, contribuindo para a estabilização da identidade desvalorizada do grupo estudado, mas também dando margem ao surgimento de agências singulares em suas posições identitárias. Nossas descobertas apoiam a necessidade de ampliar a perspectiva da pesquisa para entender o espaço escolar em sua sobreposição com outros ambientes e mundos figurativos.

Application of a methodology to design a municipal waste pre-collection network in real scenarios Cavallin, Antonella; Rossit, Diego Gabriel; Herrán Symonds, Victoria; Rossit, Daniel Alejandro; Frutos, Mariano The design of efficient municipal solid waste (MSW) pre-collection networks can contribute to the global efficiency and sustainability of the reverse logistic chain of MSW in modern cities. With this aim, in this paper a comprehensive methodology that involves making decisions in several stages, from waste fraction classification to the final optimization of waste bins? location, was applied in two real cases of the city of Bahía Blanca, Argentina. This city, does not have much available data about waste generation and, therefore, an important fieldwork had to be performed for applying this methodology, involving estimating population density per block and waste generation rate per inhabitant, identifying the location of commercial and institutional buildings and also estimating its generation rate, as well as performing a characterization of the MSW from similar studies in the literature and surveys performed to make decisions. The modelling of the urban characteristics was performed in a geographic information system. In the bins? location problem, a mixed-integer optimization model was applied, seeking to minimize the investment costs, given the maximum area available and the capacity of the bins. Different scenarios were analysed, considering different collection frequencies and the maximum distance to be travelled by the user.

Comparative study of equatorial and high-latitude over-the-horizon radar parameters using ray-tracing simulations Fagre, Mariano; Zossi, Bruno Santiago; Chum, Jaroslav; Yigit, Erdal; Elias, Ana Georgina Certain parameters of over-the-horizon radars (OTHRs) need regular adjustment to keep constant illumination of a target due to ionospheric variability. Feasible values of these parameters for an OTHR operation, namely, the ranges of operating frequencies and elevation angles can be assessed using ray-tracing simulations, together with the reflection height in the ionosphere and absorption along the path. In this letter, a comparative study of these parameters is presented considering an equatorial and a high-latitude OTHR location using a 3-D ray-tracing code interfacing IRI-2016, IGRF, and absorption models. These geographic latitudinal regions present markedly different F2 region seasonal variation, E region ionization sources, and magnetic field conditions. Only the ionization characteristics have noticeable effects in our analysis. The main differences are observed in the lowest usable frequency during nighttime and in the seasonal variability of the maximum usable frequency due to E and F2 layers differences at the corresponding locations. Absorption is quite similar in both low- and high-latitude locations

Glucocorticoid and progesterone mechanisms in photoreceptor survival Marquioni Ramella, Melisa Daniela; Cubilla, Marisa Angelica; Bermudez, Vicente; Tate, Pablo Sebastián; Marazita, Mariela Claudia; Suburo, Angela Maria Death of retinal photoreceptors is the basis of prevalent blinding diseases. Since steroids might have a therapeutic role in retinal degenerations, we compared the protective effects of dexamethasone and progesterone on photoreceptor death induced by mifepristone and light exposure. Therefore, we studied the effective protection doses for each steroid in the two models. In addition, we analyzed changes in the levels of pro- and antiapoptotic molecules, glucocorticoid receptors α and β (GRα and GRβ), and rhodopsin under conditions of successful protection and photoreceptor survival. Mifepristone and light exposure selectively damaged photoreceptors. In light exposed retinas, photoreceptors mainly disappeared in the dorsotemporal region, while mifepristone produced a uniform damage. Dexamethasone and progesterone, at the same dose of 4 mg/kg/day for 2 days, preserved over 88% photoreceptor nuclei in both models. Assessment of cell death regulators showed that, in control retinas, both steroids activated BCL-XL, a prosurvival molecule, and decreased BID, a proapoptotic regulator. After steroid treatment of damaged retinas, BCL-XL, BCL2 and BAX showed characteristic patterns depending on the use of dexamethasone or progesterone on mifepristone or light exposed retinas. By contrast, BID decreased with any injury-steroid combination. Changes in GRα or GRβ levels did not correlate with survival but were consistent with a mechanism of ligand induced downregulation of receptor expression. GRβ might be upregulated by progesterone. Both dexamethasone and progesterone increased retinal rhodopsin stores, suggesting a link between photoreceptor protection and transduction pathways. Results show that dexamethasone and progesterone induced comparable but not identical protection responses in each model.

A baseline study of microplastics in the burrowing crab (Neohelice granulata) from a temperate southwestern Atlantic estuary Villagran, Diana Mariel; Truchet, Daniela María; Buzzi, Natalia Sol; Forero Lopez, Ana Deisy; Fernandez Severini, Melisa Daiana Growing evidence has demonstrated that microplastics (MPs) are available for a wide range of marine organisms, with filter-feeding bivalves and crabs being especially vulnerable. The crab Neohelice granulata is considered a key and structuring species in the Bahía Blanca Estuary (BBE) (SW Atlantic) and its ecological role makes this species especially vulnerable to several pollutants. In this study, male specimens of N. granulata and water samples were collected at three sites in the BBE for the presence of MPs. Different types of MPs were found in all the crabs and the water column samples, although the most frequent were fibers <500–1500 μm, mainly blue. This is the first study to identify MPs in the gills and digestive tract of N. granulata. Moreover, gills presented higher total abundances of MPs than the digestive tract, which suggests that in this case the main uptake of MPs would be by adherence to the gills.

Puma and livestock in central Patagonia (Argentina): from ranchers’ perceptions to predator management Llanos, Romina Paola; Andrade, Analia; Travaini, Alejandro We analyzed surveys from 383 ranchers to determine their perceptions of puma damage in Chubut province (Central Patagonia). Thirty-two percent of respondents had a negative perception, while 65% were neutral. Negative perceptions increased: (a) with the breeding of mixed livestock, (b) with the presence of neighboring inactive, and (c) in small and medium ranches. Our results showed that ranchers use both lethal control and non-lethal methods (regular patrol of the ranch areas, night and seasonal enclosures, guardian dogs) to reduce livestock predation. Lethal control has great acceptance among ranchers, but there is a general lack of evidence about its effectiveness. Considering that our results indicated that the puma may not be the major problem in livestock areas, it is necessary to review the current management policy. We suggest focusing efforts to reduce livestock depredation only on affected ranches, prioritizing the development of non-lethal methods.

Aprendizajes informales. Perspectivas teóricas y relatos de aprendizajes Martin, Rocío Belén; Donolo, Danilo Silvio Este artículo tiene como propósito profundizar en desarrollos teóricos y empíricos sobre el aprendizaje informal. El aprendizaje informal es un tópico que refiere al aprendizaje de las personas a través de diversos entornos sociales: en el hogar, en actividades con amigos, viajes, centros comunitarios, iglesias, etc. El escrito comienza con una pequeña revisión exploratoria sobre el término y sus variaciones, y luego se realiza una recopilación de relatos sobre algunos ejemplos de aprendizaje informal. En este intento, Ciencias, TIC, Trabajo, Artes, Relaciones Sociales y Habilidades para la Vida podrían ser pensados como formas de aprendizaje informal. La variedad de construcciones para llamar al aprendizaje, la multiplicidad de intentos de definirlo, y configurarlo, son importantes para re-construir y desarrollar nuevos marcos teóricos sobre el concepto en el campo de la Psicología Educacional.; The purpose of this article is to deepen theoretical and empirical developments about informal learning. Informal learning is a subject that translates into the learning of people through various social media: at home, activities with friends, trips, community centers, churches, etc. its variations, and then there is compilation of stories about some examples of informal learning. In this attempt, Science, ICT, Work, Arts, Social Relations and Life Skills could be thought of as forms of informal learning. The variety of constructions to call learning, the multiplicity of attempts to define it, and to configure it, are important to re-construct and develop new theoretical frameworks on the concept in the field of Educational Psychology.

Dependence of Latin America external sector on commodity prices. A contemporaneity analysis using a descriptive approach Delbianco, Fernando Andrés; Fioriti, Andres We seek to analyze the relationship between some macroeconomic variables and commodity prices in Latin America. The main hypothesis is that the economic performance in the area is tied to the pattern followed by the commodity prices. Moreover we expect to find that some commodities are more relevant than others. We find evidence supporting our former hypothesis but not the latter. An important result is that macroeconomic variables and commodity prices breaks followed a bimodal distribution over the last 60 years with one mode around the 70s and the other mode at the beginning of the 21th century.; En el presente trabajo analizamos la relación entre determinadas variables macroeconómicas y los precios de commodities en América Latina. La hipótesis principal es que el desempeño económico del área siguió el patrón del movimiento de los precios de las commodities. También era esperable que algunas commodities fuesen más relevantes que otras. Encontramos evidencia a favor de nuestra primera hipótesis, pero no de la segunda. Un resultado importante es que los quiebres de las variables económicas y de los precios de las commodities siguieron una distribución bimodal durante los últimos 60 años con una moda en los setentas y la otra moda a principios del siglo 21.

Biomolecular signal tracker with fast time response de Battista, Hernán; Picó, J.; Pico Marco, Enric; Vignoni, A. Signal tracking and the related signal derivative estimation are key pieces in feedback control engineered systems. In this work we present a synthetic biomolecular circuit that performs signal tracking with high precision under mild conditions on its parameters. The circuit contains two antithetic motifs in feedback via a push-pull switch motif. We show that the output signal quickly converges to the input one. Under ideal conditions, finite-time convergence would be achieved. We also show that the circuit gives a good approximation of the input signal derivative.

Ni contigo ni sin tí. Bibliotecas populares, asociacionismo cultural y acción estatal en el sudoeste bonaerense (1880-1930); Neither with you, nor without you popular libraries, cultural associationism and public action in the southwest of the province of Buenos Aires (1880-1930) Agesta, María de Las Nieves El presente trabajo se propone indagar tres bibliotecas populares del sudoeste de la provincia de Buenos Aires (Argentina) fundadas entre fines del siglo XIX y principios del XX por diferentes agrupaciones que compartían, sin embargo, la confianza en el poder de la cultura letrada como factor civilizatorio en localidades de reciente integración al proyecto de consolidación estatal nacional. En este sentido, se pretende analizar las complejas relaciones que establecieron estas bibliotecas con los poderes públicos y sus agencias burocráticas a nivel nacional, provincial y municipal, atendiendo particularmente a las tensiones generadas entre su reivindicación autonómica y los reclamos de financiamiento y aval oficial que requerían para garantizar la continuidad y la ampliación de su obra cultural.; This paper examine three popular libraries in the southwest of the province of Buenos Aires (Argentina), founded between the end of the 19th century and the beginning of the 20th century by different groups that shared, however, their confidence in the power of written culture as a factor of civilization in locations recently integrated to the national state consolidation project. In this sense, it is intended to analyze the complex relationships established by these libraries with the public authorities and their bureaucratic agencies at the national, provincial and municipal levels, paying particular attention to the tensions generated between their claim of autonomy and the demands for financing and official endorsement required to ensure continuity and expansion of their cultural work.

Marcadores conversacionales de acuerdo en la enseñanza de Español como Lengua Extranjera; Conversational markers of agreement when teaching Spanish as a Foreign Language; Pogovorni označevalci strinjanja pri poučevanju španščine kot tujega jezika Cantamutto, Lucía Marina; Fainstein, Paula Elizabeth De acuerdo con el último informe del Instituto Cervantes (Fernández Vitores, 2018), el español constituye no solo la segunda lengua materna del mundo, sino que también representa la segunda de comunicación internacional. Además, el mismo documento afirma que, junto con el inglés, el francés y el alemán, es uno de los idiomas más estudiados como lengua segunda o extranjera. Por atra parte, el español constituye «una de las lenguas con mayor cantidad de variantes idiomáticas y normas regionales y de grupo» (Rojas Mayer, 2000: 15), dada su estandarización policéntrica (Fontanella de Weinberg, 1990). En tal sentido, el estudiante de segundas lenguas debe desarrollar sus competencias pragmáticas y comunicativas de acuerdo con la variedad del español predominante en el intercambio.; For the acquisition and domain of the spectrum of functions that markers have, the ELE (Spanish initials for Spanish as a Foreign Language) student needs to encounter the different contexts where they operate. ELE textbooks usually address markers superficially, showing univocal lexical meaning, only attending to their oral dynamic and, generally, exemplifying just with the expression bueno. This paper analyses the dynamics of some conversational markers of agreement in written digital interactions in Argentinean Spanish, from the approaches of Interactional Sociolinguistics and Sociocultural Pragmatics. In addition, we integrate the contributions of the communicative model for foreign language teaching. Our objective is twofold. On the one hand, to demonstrate the incidence of the communicative situation in the interpretation of conversational markers of agreement, whose polarity, depending on linguistic and extralinguistic factors, is both positive (marker of agreement) and negative (anger expression). On the other hand, to focus on the loanword OK – with much use in the oral interactions of ELE students – and the nuances that it acquires in the written digital interactions. Through a qualitative analysis of 20 surveys conducted in Argentina, the results indicate the relevance of addressing different occurrence contexts to comprehend the complexity of the markers.; Da bi usvojil in obvladal razpon vlog označevalcev, se mora učenec španščine kot tujega jezika soočiti z različnimi konteksti njihove rabe. Priročniki in učbeniki za španščino kot tuji jezik jih navadno ne obravnavajo poglobljeno, temveč predstavijo zgolj enoznačne leksikalne pomene, se pri tem posvečajo izključno govorjeni dinamiki in jih običajno ponazorijo le z izrazom bueno. V prispevku se analizira dinamiko nekaterih pogovornih označevalcev strinjanja v pisnem digitalnem sporazumevanju v argentinski španščini, in sicer z vidika interakcijske sociolingvistike in sociokulturne pragmatike. Prav zato smo vključili tudi doprinos komunikacijskega modela za poučevanje tujih jezikov. Zasledujemo dva cilja: pokazati vpliv sporočanjske situacije na interpretacijo pogovornih označevalcev strinjanja, ki lahko v skladu z jezikovnimi in zunajjezikovnimi dejavniki odražajo tako pozitivno (označevalec strinjanja) kot negativno (izraz jeze) polarnost; in se nato osredotočiti na sposojenko ok in vrednosti, ki jih lahko izraža v pisnem digitalnem sporazumevanju. Rezultati kvalitativne analize dvajsetih v Argentini izvedenih anket kažejo na pomembnost obravnave različnih kontekstov pojavljanja za razumevanje kompleksnosti označevalcev.

Activation of Peroxymonosulfate and Persulfate by Metal Loaded Mesoporous Catalysts for Orange G Dye Degradation Schlichter, Sofia; Dennehy, Mariana; Alvarez, Mariana The main objective of this research was to study the catalytic activation of two different oxidants (potassium persulfate, PS and peroxymonosulfate, PMS) employing sulfate-based Advanced Oxidation Processes (AOPs). For this purpose, heterogeneous copper and cobalt catalysts were synthesized supported on MCM-41 mesoporous material. These catalysts were characterized by means of Atomic Absorption Spectroscopy (AA), X-ray diffraction (XRD), and Transmission Electron Microscopy (TEM). The metal charge of the catalysts ranged from 5% to 18%. The mesoporous arrangement was held after the metal loading and calcination, as shown by XRD patterns and TEM micrographs. The catalytic degradation of Orange G azo dye (Orange G: OG, disodium 7-hydroxy-8-[(E)-phenyldiazenyl]-1,3-naphthalenedisulfonate) was analysed, and the catalyst activities were determined in a batch reactor. The combination of PMS and higher metal-content Co-supported catalyst attained the best efficiency. In these conditions, the complete decolourization (100%) of the dye was achieved in the first minutes of reaction, while its mineralization reached after 4 h was 49%. Additionally, the catalytic activity of the Co/PMS system (a measure of the catalyst’s reusability) remained constant after three cycles of usage.

Volación en las primeras décadas del siglo XX: su empleo en la prensa y en el Manual Práctico de Volación de Zuloaga; Volación in the first decades of the 20th century: its use in the press and in the Manual Práctico de Volación by Zuloaga De- Matteis, Lorena Marta Amalia Como parte de una investigación más amplia en torno al léxico español del vuelo (de- Matteis, 2017), este artículo presenta nuevas observaciones en torno al empleo de la voz volación, como alternativa léxica para la primera acepción de aviación, 'locomoción aérea por medio de aparatos más pesados que el aire' (DLE) durante las primeras décadas del siglo XX en la región lingüística correspondiente al español bonaerense. El objetivo del trabajo es contrastar sus empleos no terminológico y terminológico (Cabré, 1999) a partir de textos periodísticos publicados en el semanario Caras y Caretas y del Manual práctico de volación (1923) de Zuloaga, respectivamente, para identificar posibles nuevos sentidos y corroborar la hipótesis de su procedencia francesa.; As part of a wider investigation about the Spanish lexicon of flight (de- Matteis, 2017), this article presents new observations about the use of volación, as a lexical alternative for the first meaning of aviation, ‘aerial locomotion by means of heavier-than-air devices’ (DLE) during the first decades of the 20th century in the linguistic region of Bonaerense Spanish. The objective of the paper is to contrast its non-terminological and terminological uses (Cabré, 1999), resorting to journalistic texts published in Caras y Caretas, a weekly publication, and to the Manual Práctico de Volación (1923) by Zuloaga, in order to identify possible new meanings and to corroborate the hypothesis of its French origin.

Estudio tafonómico del sitio arqueológico Yegua Quemada 3, Holoceno Medio, Patagonia meridional; Taphonomical analysis of the mid-Holocene Yegua Quemada 3 archaeological site (Southern Patagonia) Cañete Mastrángelo, Daniela Soledad; Lobbia, Patricia Alejandra; Muñoz, Andres Sebastian En este trabajo se presentan los resultados del análisis tafonómico efectuado en el depósito Yegua Quemada 3, Parque Nacional Monte León, con una ubicación cronológica correspondiente al Holoceno medio. Los resultados muestran que el material arqueomalacológico se encuentra en un proceso de degradación avanzado, resultado de períodos de exposición, indicados por la pérdida de color, pero también de enterramiento, indicado por la pérdida de las capas externas y la dureza de las valvas. Los restos de vertebrados muestran asimismo la importancia que los procesos bioestratinómicos y diagenéticos tuvieron en la historia depositacional del conjunto. Las superficies óseas están afectadas de manera homogénea, lo que indica exposición a condiciones subaéreas. El conjunto artefactual lítico presenta evidencias de haber pasado por períodos de exposición subaérea, evidenciado por la abrasión eólica y períodos de enterramiento, mostrado por el desarrollo de un revestimiento de carbonato. El conjunto de evidencias considerado y las variables tafonómicas analizadas permiten concluir que el depósito YQ3 brinda información adecuada para discutir la ocupación humana al sur del río Santa Cruz en un bloque temporal, el Holoceno medio, período para el cual se cuenta con limitada información.; This paper presents the results of the taphonomic analysis carried out in the Yegua Quemada 3 (YQ3) archaeological deposit, Monte León National Park, dated back to the mid Holocene (5360 ± 20 years BP). The results show that the archaeomalacological materials are in a process of advanced degradation, being the result of exposure, indicated by the loss of color, but also of burial, indicated by the loss of the outer layers and hardness of shells. Vertebrate remains also show the importance that biostratinomic and diagenetic processes had in the site depositional history. Bone surfaces are affected in a homogeneous way, indicating exposure to subaerial conditions. The lithic artefactual assemblage displays evidence of having gone through periods of subaerial exposure, evidenced by wind abrasion, as well as burial periods, shown by the development of a carbonate skin. The set of evidences considered and the taphonomic variables analyzed here allows to conclude that YQ3 deposit provides adequate data to discuss the human occupation south of the Santa Cruz River in the mid Holocene.

Fases, similitudes y diferencias entre los casos de las dictaduras y economiá política en Argentina, 1966-1973 y 1976-1983, y Brasil, 1964-1985; Phases, Similarities and Differences between the Cases of Dictatorships and Political Economy in Argentina, 1966-1973 and 1976-1983, and Brazil, 1964-1985 Bona, Leandro Marcelo; Paéz, Sergio M. Argentina y Brasil vivieron dictaduras cívico-militares durante las décadas de 1960 y 1980. En Argentina, la experiencia se dividió en dos etapas: en la primera (1966-1973) se persiguió una estrategia industrializadora; mientras que en la segunda (1976-1983), se alineó al proceso neoliberal. En Brasil, la dictadura (1964-1985) se inició en pleno auge de la etapa desarrollista y no abandonó ese patrón económico. En este artículo se analiza la evolución de ambas experiencias desde la economía política; se indaga en las formas que asumen los procesos de acumulación de capital en cada caso, al analizar cómo las dictaduras incidieron en los mismos, así como los objetivos ideológicos y de política económica que persiguieron. La comparación pone en debate aspectos como las condicionantes del mercado mundial en las dinámicas internas de cada país y las alianzas de clases sociales para entender las similitudes y diferencias entre los dos países.; Argentina and Brazil experienced military civic dictatorships during the 1960s and 1980s. In Argentina, the experience is divided into two stages: In the first one (1966-1973), the country pursued an industrializing strategy; in the second one (1976-1983), it started a neoliberal process. In Brazil, the dictatorship (1964-1985) began in the context of the developmental stage and did not abandon that economic pattern. This article analyzes the evolution of both experiences with the elements of political economy; it investigates the processes of capital accumulation in each case, by analyzing how the dictatorships affected them, as well as the ideological and economic policy objectives they searched. This comparison discusses aspects such as the conditions of the world market in the internal dynamics of each country and social class alliances to understand the similarities and differences between both countries.

Sexual dimorphism and patterns of sexual behavior in Lustrochernes argentinus (Pseudoscorpiones: Chernetidae) Palen Pietri, Rocio; Ceballos, Alejandra de Lourdes; Peretti, Alfredo Vicente Sexual dimorphism between females and males can sometimes be related to particular mating behaviors. In pseudoscorpions, very little is known about the relationship between sexual size dimorphism (SSD) and reproductive behavior. This paper describes sexual dimorphism and the mating behavior patterns of Lustrochernes argentinus (Thorell, 1877), a Neotropical species of Cheliferoidea. We measured different body structures and appendages of 14 individuals of each sex, with the values compared with a T-test. We also analyzed the sexual behavior repertoire occurring during mating between nine couples. We found SSD for several structures: the fixed and movable finger width, and the angle between IV coxae are larger in females, in contrast with the gap between fingers which is bigger in males. The analysis of sexual behavior patterns in this species showed that the reproductive behavioral repertoire is structured in three phases: Phase I (examination), Phase II (spermatophore deposition) and Phase III (sperm transfer) with a mean duration of 2.2 min, 5 min, and 7.5 min, respectively. Some structures that showed SSD, and also the composition and duration of different behavioral phases, are different from those of other species of the family Chernetidae. We discuss the results based on current knowledge in pseudoscorpion biology with prospects of further studies studying sexual selection.