El empleo y el trabajo como dimensiones de análisis: El proceso de inserción laboral de estudiantes del FinEs2; The employment and the work like dimensions of analysis: The labor insertion of FinEs2’s students Gonzalez, Federico Martin El artículo analiza el proceso de inserción laboral de jóvenes estudiantes del Plan de Finalización de Estudios Secundarios (FinEs2) de un barrio de la Delegación municipal de Melchor Romero. Desde una perspectiva metodológica cualitativa, se analizan las formas en que se configuran las posiciones de los jóvenes en el mercado de trabajo y las disposiciones sobre las distintas esferas del mundo laboral. Finalmente, a partir de la articulación de las dimensiones objetivas -relacionadas a la estabilidad y a las condiciones de trabajo- y subjetivas -vinculadas al reconocimiento material y simbólico- se avanza en la construcción de cuatro tipo de posiciones en el mercado de trabajo, que permiten problematizar las relaciones entre nivel de formación, acceso y calidad del empleo.; The aim of this paper is to analyze the labor insertion processes of young people who finished high school under the new public education terminality policies, such as the Plan de Finalización de Estudios Secundarios (FinEs2). From a perspective based on qualitative methods, we study labor market's positions and working arrangements. As a result, we advanced in the connections between objective dimensions -associated with stability and working conditions- and subjective dimensions -linked to material and symbolic recognition- to define four types of positions on the labor market which allow to problematize the relationships between the education level, access and quality of employment.

First records of Calidris canutus Linnaeus, 1758 (Charadriiformes, Scolopacidae) and Trogon surrucura Vieillot, 1817 (Trogoniformes, Trogonidae) for Entre Ríos province (Argentina), and noteworthy reports of other birds in protected areas Sarquis, Juan Andrés; Valetti, Julian Alonso; Giraudo, Alejandro Raul; Berduc, Alfredo We recorded 2 new bird species in Entre Ríos province, Argentina: Calidris canutus (Linnaeus, 1758) and Trogon surrucura Vieillot, 1817. In addition, we present 25 noteworthy records for bird species in El Palmar National Park, Pre Delta National Park, and other parts of the province.

Las aldeas 'Patrón Tafí' Del sur de cumbres calchaquíes y norte del sistema del aconquija; The villages "Tafí pattern" of the south of Calchaquíes hills and north of the Aconquija system Oliszewski, Nurit El objetivo del presente trabajo es reflexionar acerca de cómo se materializaron las aldeas patrón Tafí al sur de las Cumbres Calchaquíes y norte del Sistema del Aconquija durante el primer milenio de la Era. Este diseño se extiende por una amplia área que incluye al valle de Tafí, el valle de La Ciénega, la cuenca de Anfama y la Quebrada de Los Corrales. Pero si bien el diseño fue semejante, las evidencias denotan una variabilidad al interior del mismo (en cuanto a cantidad, emplazamiento y relación espacial con estructuras productivas) que es interesante conocer para saber si también implicó una variabilidad funcional y social (tipo de vínculos entre las distintas unidades domésticas). De esta manera algunas de las preguntas que intentamos responder giran alrededor de los orígenes, cuántas aldeas y de qué tipo funcionaron al mismo tiempo en esta zona, dónde terminaba una aldea y comenzaba la siguiente, si la configuración topográfica tuvo algo que ver en la delimitación, si todas las aldeas estaban asociadas a áreas productivas, si hubo diferencias funcionales entre ellas y si el diseño compartido -considerado como un agente activo- implicó alguna clase de vinculación que superara a la organización aldeana.; The objective of the present work is to reflect on how the Tafí pattern villages located in the south of the Cumbres Calchaquíes and in the north of the Aconquija System materialized during the first millennium of the Age. This design extends over a wide area including the Tafí Valley, La Ciénega Valley, the Anfama Basin and Quebrada de Los Corrales. Despite the fact that the design was similar, evidences indicate certain variability inland (in terms of quantity, location and spatial relation with productive structures) which is interesting to study so as to know whether it implied functional and social variability (type of links among the different domestic units) as well. In this sense, some of the questions posed in this work revolve around the origins, how many and what kind of villages functioned at the same time in this zone, where one village ended and the next began, whether the topographic configuration had something to do with the delimitation, whether all villages were associated with productive areas, whether there were functional differences among them and whether this shared design (considered as an active agent) implied some kind of correlation which surpassed the village organization.

Educación popular: experiencias, prácticas y reflexiones en un barrio periférico de la ciudad de Bahía Blanca (2011-2014) Becher, Pablo Ariel Las múltiples experiencias de educación popular desarrolladas en los últimos años en nuestro país (Argentina) han marcado una serie de procesos constitutivos de expresiones culturales y transformación social en distintos actores sociales sobre territorios diversos (barrios, sindicatos, escuelas, etc.). Estas manifestaciones generaron un impacto profundo y reflexivo sobre las prácticas pedagógicas de los sujetos sociales involucrados, tanto de educadores/as y/o educandos/as. A partir de estas consideraciones, se realizó una descripción y análisis de la experiencia de educación popular formalizada por el Colectivo La Cigarra, donde participaron estudiantes, docentes y formadores pedagógicos de la ciudad de Bahía Blanca, en los años 2011- 2014, dentro de dos barrios marginales denominado Villa Caracol (Puertas al Sur) y en un sector de Bajo Rondeau. Para profundizar en el análisis, se acudió a la visión de los/as participantes del barrio, utilizando la técnica de la entrevista oral semi-estructurada (Vasilaschis de Gialdino, 2007) y la información de fuentes periodísticas. También se acudió a una serie de sistematizaciones escritas por los/as protagonistas efectuadas durante las distintas jornadas de encuentros, planificaciones, minutas de reuniones, balances y proyectos volcados en distintos tipos de registros escritos y fotográficos. De este modo, se asume la necesidad de una reflexión que permita el debate sobre las relaciones posibles entre educación formal y no-formal, y su posible articulación en torno a un tipo de enseñanza/ aprendizaje contrahegemónico en espacios diversos.

Enhanced transmission via cavity modes in gratings formed by subwavelength metallic cylinders Lester, Marcelo Fabian; Skigin, Diana Carina In the last few decades, special attention has been paid to the optical response of structures composed of periodic subwavelength slits in thin metallic sheets. Extraordinary transmission and evanescent-to-propagating conversion are two of the main effects that have been most investigated in these systems. In this paper, we present an alternative way of enhancing the intensity diffracted by a grating through morphological electromagnetic resonances. Unlike nanoslit arrays, in this system the cavities are formed by periodically distributed chains of metallic subwavelength cylinders, which behave like walls that confine the fields and thus show resonant behavior. The set of cavities is illuminated by an evanescent wave generated by total internal reflection. We show that resonant coupling of cavity modes excited by the inhomogeneous wave produces enhanced transmission of up to 92% and also that the system has the ability of steering most of the transmitted intensity in a particular direction given by the diffraction orders. The results are compared with those obtained from a similar structure formed by periodically distributed perfectly conducting solid walls.

Política y personalismo en el orden conservador: el senador Pérez entre la provincia y la Nación (Jujuy, 1877-1910) Paz, Gustavo Luis Un rasgo particular de la política jujeña bajo el orden conservador fue la presencia de un fuerte personalismo que afectó la vida política, el funcionamiento de las instituciones provinciales y la relación entre la provincia y el gobierno nacional. Me refiero al accionar del Senador Dsomingo T. Pérez, quien representó a la provincia ante el Senado Nacional durante casi un cuarto de siglo, entre 1886 y 1910. En este trabajo me concentro sobre la organización de la vida política de esa provincia con centro en la carrera política del Senador Pérez, quien se convirtió en el árbitro de la política jujeña en las últimas dos décadas del orden conservador.; In this work I study the influence of a strong politician who controlled provincial politics in Jujuy under the Conservative regime of the late 19th and early 20th century. Senator Domingo T. Pérez was the arbiter of provincial politics whose actions affected the political and institutional life of the province as well as its relationship with the national government between 1886 and 1910. I concentrate on the features of the political career of Senator Pérez and on his grip over the political life of his province.

La jeunesse rurale en Amérique latine Kessler, Gabriel; Nuñez, Pedro Fernando De multiples facteurs ont fait que les sciences sociales et les politiques publiques sont demeurées longtemps aveugles à la problématique de la jeunesse rurale. Du fait de sa faiblesse en tant qu’acteur social spécifique et de son déficit de visibilité en tant que «problème social» – à la différence de divers secteurs de la jeunesse urbaine –, elle n’a jamais été un sujet de préoccupation pour l’Etat ou pour les politiques publiques2. Aujourd’hui encore, malgré la consolidation du champ des études sur la jeunesse rurale en Amérique latine, les travaux réalisés dans différents pays continuent à être marqués par un biais urbain3. Cet article propose un état des lieux des travaux universitaires actuels sur la jeunesse rurale dans la région. Les thèmes centraux des études que nous présentons ont trait à la conceptualisation de la jeunesse rurale, aux relations familiales et de genre, aux expériences éducatives, au monde du travail, à la participation politique et sociale, aux migrations et à la thématique indigène. Pour chacun d’entre eux, nous prenons en compte trois clés analytiques : la circulation entre les milieux rural et urbain, les formes d’organisation politique et la discussion sur la nouvelle ruralité. Ces trois axes nous paraissent utiles en tant que clés de lecture transversales aux différentes thématiques.

Influencia del uso y gestión de la envolvente en el comportamiento térmico de verano de una vivienda en la ciudad de Mendoza, Argentina; Influence of the use and management of the envelope in the thermal behavior of a house in summer in the city of Mendoza, Argentina Andreoni Trentacoste, Soledad Elisa; Ganem, Carolina En la ciudad de Mendoza, Argentina, las viviendas presentan mayoritariamente una baja calidad constructiva en relación con la falta de aislamiento de sus envolventes. Se estima que el 95% de las viviendas existentes no están aisladas en su envolvente vertical y presentan aislamiento insuficiente en techos. En un clima templado continental, con grandes amplitudes térmicas diarias y estacionales, las viviendas presentan inercia térmica como única estrategia bioclimática. En estas circunstancias, las posibilidades de gestión que ofrezca la envolvente -a través de elementos practicables y/o móviles-, son claves para la aproximación al logro del confort interior. El presente trabajo analiza la influencia del uso y gestión de las aberturas en la envolvente a cargo del usuario en una vivienda tradicional, mediante monitoreo higrotérmico, durante 59 días en verano. Para ello, se midieron dos períodos con distintas condiciones climáticas (extremas y moderadas) en los que se aplicó la estrategia de ventilación natural nocturna, gracias a la cual se obtuvo 82% de horas en confort. Asimismo, se midió un período sin gestión de las aberturas en la envolvente, es decir, manteniéndolas cerradas; de lo que resultó solo un 6% de horas en confort. Se concluye, en suma, que la intervención comprometida y consciente del usuario mediante el aprovechamiento de la ventilación nocturna, en combinación con la inercia térmica de la envolvente, influye de manera positiva sobre el comportamiento térmico de la vivienda.; In the city of Mendoza, Argentina, houses have mostly low constructive quality related to the lack of insulation in their envelopes. In a temperate continental climate, with important daily and seasonal thermal amplitudes, the houses have thermal inertia as the only bioclimatic strategy. In these circumstances the possibilities of management offered by the envelope–through movable and operable elements-, are key for achieving indoor thermal comfort, reducing the overheating in summer. This work analyses the influence of the use and management of the envelope by the user in a traditional house, by hydrothermal monitoring during 59 days in summer. Two periods with extreme and moderate climatic conditions, were measured, in which the nocturnal ventilation strategy for cooling, combined with the closure of windows during daytime, allowed obtaining 82% of comfort hours. A period without management of the envelope and when the house remained completely closed during daytime and nighttime, was also measured, obtaining only 6% of hours in comfort. It is concluded that the committed and conscious intervention of the user through the use of night ventilation as a cooling strategy, in combination with the thermal inertia of the envelope, play an important role in achieving indoor thermal conditions reducing overheating during summer.

Quantifying the motor efficiency via information theory Soria, Verónica D.; Navarro, Cecilia M.; Pizá, Alvaro Gabriel; Lucianna, Facundo Adrián; Ruiz, Gabriel Alfredo; Farfan, Fernando Daniel En este trabajo se propone un método para cuantificar la eficiencia motriz, basado en métricas específicas de la teoría de la información. Así, una medida de información es obtenida a partir de registros electromiográficos (EMG) y características cinemáticas de la actividad motora. Las señales de EMG fueron obtenidas del músculo deltoides medio durante contracciones dinámicas evocadas por elevaciones laterales (movimientos de abducción y aducción del brazo) en el plano escapular. Esta actividad motora fue realizada a diferentes velocidades y bajo diferentes condiciones de carga. La eficiencia de la actividad motora fue evaluada para cada situación. El método propuesto resultó adecuado para situaciones en el cual la actividad motora es realizada bajo condiciones no estacionarias (contracciones dinámicas).; A method based on Information Theory for quantify the movement efficiency was proposed. The measurement of information provides a quantitative metric of motor efficiency. This measure is obtained from electromyographic (EMG) recordings and the kinematic of motor activity. Here, the EMG signals from middle right deltoid were recorded during dynamic contraction. These contractions were evoked by abduction-adduction arm movements at scapular plane. The arm movements were realized at different speeds and under different loading conditions. The efficiency of motor activity was then evaluated for each situation. The proposed method is suitable for situations in which motor activity is performed under non-stationary conditions (dynamic contractions).

Dynamic electromyography of voluntary repetitive movements: Processing techniques and interference reduction Presti, Javier M.; Pizá, Alvaro Gabriel; Lucianna, Facundo Adrián; Ruiz, Gabriel Alfredo; Farfan, Fernando Daniel En este trabajo se han propuesto técnicas de procesamiento adecuadas para el análisis de registros electromiográficos (EMG) dinámicos. Las señales de EMG fueron registradas desde los músculos del hombro (deltoides anterior, posterior, medio) y el músculo trapecio, durante movimientos voluntarios / repetitivos del brazo, y bajo diferentes condiciones cinéticas y cinemáticas de los movimientos. Se analizaron las correlaciones entre la actividad miográfica y la posición del brazo, y los efectos de la fatiga muscular. Se implementó un análisis de componentes independientes (ICA) para reducir la interferencia cruzada de los músculos cercanos. Se determinó que la ejecución de los movimientos del brazo con cargas externas provoca sobre estimación en la cuantificación de la fatiga, la cual puede ser corregido con un procedimiento ICA.; Processing techniques suited to the electromyographic signals evoked for dynamic contractions is proposed in this paper. EMG signals were recorded from the shoulder muscles (middle, anterior and posterior deltoids) and the trapezius muscle, during voluntary / repetitive arm movements and under different kinematic and dynamic conditions. The correlations between the myographic activity and arm position, and its alterations due to muscular fatigue were analyzed. Independent component analysis was implemented in order to reduce crosstalk interference of neighboring muscles. It was determined that the effects of fatigue observed during movements with load are influenced by the crosstalk interference, causing underestimates in the muscular fatigue measures.

Sin un árbol que dé alegría. Experiencias del paisaje nativo y colonial en Mendoza entre los siglos XVI y XIX; Without a tree to rejoice. Experiences of the native and colonial landscape in Mendoza between the XVI and XIX centuries Mafferra, Luis Eduardo; Marconetto, María Bernarda A partir de las concepciones actuales sobre el ambiente en la provincia de Mendoza (Argentina), analizamos en este trabajo información documental sobre sus raíces históricas. Más precisamente, observamos testimonios sobre la experiencia del ambiente entre los siglos XVI y XIX, detectando indicios que permiten comprenderla en el contexto de la esquematización de modalidades de relación entre la sociedad y su entorno. Nos interesa especialmente observar el lugar de las plantas en este proceso; ya que en base a datos arqueológicos e históricos se ha corroborado que el período de estudio incluyó cambios en la conformación de los paisajes forestales. Asimismo, definimos a grandes rasgos unidades de análisis diferenciadas por la asociación de materialidades-significados que conformaron paisajes específicos, más precisamente, el paisaje nativo y el colonial. Los datos analizados permiten observar disposiciones de relación diferentes entre ambas; resultando los árboles y arbustos posibles elementos claves en la modelación de las experiencias. Estas interpretaciones habilitan para retomar el debate que sirvió de punto de partida discutiendo, a razón de la información histórica presentada y las interpretaciones construidas a lo largo del trabajo, las implicancias de las actuales conceptualizaciones y modos de relación con el ambiente en la región.; Starting off from the current environmental conceptions in the Mendoza province (Argentina), we analyze here documentary information about its historical roots. More precisely, we observe testimonies about the experience of the environment between the sixteenth and nineteenth centuries, detecting clues allowing context understanding of the schematization of modalities in the relationship between society and its environment. We are particularly interested in observing the place of the plants in this process; since from archaeological and historical data it has been corroborated that the period of study covered changes in the conformation of the forest landscapes. For this purpose, we broadly define units of analysis differentiated by the association of materialities-meanings that conformed specific landscapes, more precisely, the native and colonial landscape. The analyzed data allows for observation of different relationship between both; resulting trees and shrubs possible key elements in the modeling of experiences. These interpretations make it possible to resume the debate that was used as a starting point, discussing, on the basis of the historical information presented and the interpretations built throughout the paper, the implications of current conceptualizations and modes of relation with the environment in the region.

Virtual Endocast Morphology of Mesotheriidae (Mammalia, Notoungulata, Typotheria): New Insights and Implications on Notoungulate Encephalization and Brain Evolution Fernández Monescillo, Marcos; Antoine, Pierre Olivier; Pujos, François Roger Francis; Gomes Rodrigues, Helder; Mamani Quispe, Bernardino; Orliac, Maeva We provide morphological, quantitative, and qualitative studies of cranial endocasts of mesotheriid notoungulates solving previous open debate on notoungulate endocasts. For that purpose, we use the most accurate digital reconstructions methods. We confirm that mesotheriids have endocasts similar in shape and gyrification to those of other rodent-like notoungulates (i.e., Hegetotheriidae and Interatheriidae) and living cavy rodents (e.g., Dolicavia minuscula, Hydrochoerus, and Cavia). We identify these similarities as evolutionary response to potentially similar ecological constraints. Based on the encephalization quotient (EQ) of several notoungulate families (i.e., Mesotheriidae, Interatheriidae, Notohippidae, Toxodontiidae, and Hegetotheriidae), there seems to be no increase in terms of EQ or neocortical complexity through time in that group. In addition, comparison with several Holarctic ‘euungulates’ leads us to propose differential predation pressure as a potential driver for EQ. Among notoungulates, braincase comparison between well-known Oligocene–Pleistocene mesotheriids and other families identifies lifestyle as an additional possible driver for EQ, with lower values for semifossorial taxa, in a similar way to rodents. Finally, the observed stability of mesotheriid EQ (from the Oligocene to the Pliocene) would match a conservative lifestyle further reflected by their highly invariant appendicular skeleton.

Early Devonian organic-walled phytoplankton and miospores from the Precordillera Basin of San Juan, Argentina: biostratigraphic and paleobiogeographic implications García, Victoria Josefina; Rubinstein, Claudia Viviana; Rustán, Juan José The palynological assemblages of the Talacasto and Punta Negra formations, from the Argentinean Precordillera, were analysed. Marine phytoplankton is dominant in both stratigraphic units. ?Cymatiosphaera florida, Evittia sommeri, Palacanthus ledanoisii, Riculasphaera fissa, Schizocystia pilosa, Tysanoprobolus polykion and Winwaloeusia distracta are among the most age-significant phytoplankton species of the Talacasto Formation, while Amicosporites sp. cf. A. streelii, Dictyotriletes emsiensis Morphon, Dictyotriletes favosus and ?Knoxisporites riondae prove the most biostratigraphically significant miospore species. A Lochkovian to probably late Pragian age is interpreted based on the marine and terrestrial palynomorphs. The lower part of the Punta Negra Formation contains phytoplankton species such as Cordobesia oriental, Cordobesia uruguayensis, Duvernaysphaera stellata, Navifusa bacilla, Polyedryxium fragosulum and Pterospermella sp. cf. P. pernambucensis as well as the miospores Acinosporites sp. cf. A. lindlarensis and Apiculatasporites microconus, which suggests an early Emsian age. Taxa such as Cordobesia, Schizocystia and Winwaloeusia support affinities of the Argentinean assemblages with Gondwana.

Montmorillonite-alginate beads: Natural mineral and biopolymers based sorbent of paraquat herbicides Etcheverry, Mariana; Cappa, Valeria Alejandra; Trelles, Jorge Abel; Zanini, Graciela Pilar Beads of alginate montmorillonite have been used for the first time as sorbent of the cationic pesticide paraquat (PQ). They are a green material because they are formed by a biopolymer and a clay mineral, and because they allow using an energy efficient process to separate the beads after PQ adsorption. The general characterization of the beads, with montmorillonite contents ranging from 0% to 70%, has been carried out by elemental composition, FTIR and thermal analysis. The shape, external morphology and internal structure of the beads were examined by SEM. Wet beads were also observed with a digital camera. PQ adsorption was studied with adsorption isotherms from aqueous solutions, and maximum adsorption capacities (Qmax) were 0.093, 0.146, 0.187 and 0.278 mmol g−1 for montmorillonite contents of 0, 5, 30 and 70%, respectively. Qmax varied linearly with the clay content. The results show that montmorillonite is practically the only PQ sorbent, with alginate acting mainly as support of the clay particles, but playing a very important role allowing an effortless handling of the material and the adsorbed pollutant.

The Oldest Beetle and Bee Ichnofossils from Mexico and their Paleoenvironmental Implications Guerrero Arenas, Rosalía; Jiménez Hidalgo, Eduardo; Genise, Jorge Fernando Specimens of Fictovichnus gobiensis, Celliforma curvata, Celliforma rosellii, Celliforma germanica and Celliforma isp. were collected from paleosol horizons in a fluviolacustrine succession near Santiago Yolomécatl town, in northwestern Oaxaca, southern Mexico. These ichnofossils represent the oldest evidence of beetles and bees in Mexican localities. K–Ar ages and the record of the equid Miohippus assiniboiensis, an index fossil, indicate that the age of the deposits is late Eocene. Based on the presence of the insect ichnofossils, pedogenic carbonate isotopes and mammal proxies, the inferred type of vegetation present in the study area was scrubland/woodland, within subhumid to subarid conditions.

Characterizing segregation in the Schelling–Voter model Caridi, Délida Inés; Pinasco, Juan Pablo; Saintier, Nicolas Bernard Claude; Schiaffino, Pablo In this work we analyze several aspects related with segregation patterns appearing in the Schelling–Voter model in which an unhappy agent can change her location or her state in order to live in a neighborhood where she is happy. Briefly, agents may be in two possible states, each one represents an individually-chosen feature, such as the language she speaks or the opinion she supports; and an individual is happy in a neighborhood if she has, at least, some proportion of agents of her own type, defined in terms of a fixed parameter T. We study the model in a regular two dimensional lattice. The parameters of the model are ρ, the density of empty sites, and p, the probability of changing locations. The stationary states reached in a system of N agents as a function of the model parameters entail the extinction of one of the states, the coexistence of both, segregated patterns with conglomerated clusters of agents of the same state, and a diluted region. Using indicators as the energy and perimeter of the populations of agents in the same state, the inner radius of their locations (i.e., the side of the maximum square which could fit with empty spaces or agents of only one type), and the Shannon Information of the empty sites, we measure the segregation phenomena. We have found that there is a region within the coexistence phase where both populations take advantage of space in an equitable way, which is sustained by the role of the empty sites.

Las cartas de la cárcel: una forma alternativa de testimoniar durante y después de la última dictadura argentina Guillard, Amandine Marie Este trabajo pretende echar luz sobre un aspecto poco conocido de la historia de las cárceles argentinas de la última dictadura (1976-1983): la correspondencia de los presos políticos. A la luz de un amplio corpus, tanto inédito como publicado, nos plantearemos la función de la "visibilización" y de la publicación de este material que tiende a hacerse cada vez más público. La enorme cantidad de cartas producidas durante aquel periodo nos obligará a realizar una selección del material tratando de dar a conocer tanto cartas de varones como de mujeres, escritas en distintos presidios del país y a distintos momentos de la dictadura. Si nuestra principal hipótesis se basa en el hecho de que constituyen un testimonio alternativo, nuestra tarea será demostrar en qué este testimonio excedió las fronteras espacio-temporales de las cárceles dictatoriales y de la esfera de lo íntimo para llegar a formar parte de la esfera pública y colectiva y a constituirse como un testimonio de alto valor para diversos sectores de la población.

Thinking in the sustainability of Nothofagus antarctica silvopastoral systems, how differ the responses of seedlings from different provenances to water shortage? Bahamonde, Héctor A.; Sánchez Gómez, D.; Gyenge, Javier Enrique; Peri, P. L.; Cellini, J. M.; Aranda, I. Nothofagus antarctica, is the most important species of the silvopastoral systems of southern Patagonia. However, there is limited information on the ecophysiological response mechanisms of seedlings for survival under different resource availability regimes, and whether such processes may differ between provenances. In this study, we evaluated the functional response to water shortage of seedlings of four N. antarctica provenances grown under controlled conditions. After an initial full irrigation period, seedlings were subjected to a water shortage cycle. Measurements of the diameter at the base of the stem, net photosynthesis (An), stomatal conductance to water vapour (gs), predawn water potential (Ψpd), osmotic potential at maximum and zero turgor (Π100; Π0), relative water content at zero turgor (RWC0) and maximum modulus of elasticity (Emax) were carried out during the experimental period. Differences between provenances concerning An and gs rates were recorded under full irrigation conditions, but were not detected in association with drought stress. All provenances had similar osmotic potential values (Π100 and Π0) at full irrigation, but water shortage led to significant osmotic potential differences between provenances. During the whole experimental period, no significant differences on RWC0 and Emax values were recorded among provenances. Under full irrigation conditions, all N. antarctica provenances had a similar physiological performance which suggests that environmental conditions may be the main driver for phenotypic differences in this species. From the osmotic adjustment results gathered, it is derived that a major osmoregulation capacity in response to water shortage is a common feature of all the N. antarctica provenances evaluated.

Bone regeneration mediated by a bioactive and biodegradable extracellular matrix-like hydrogel based on elastin-like recombinamers Coletta, Dante Jesus; Ibáñez Fonseca, Arturo; Missana, Liliana Raquel; Jammal, María Victoria; Vitelli, Ezequiel J.; Aimone, Mariangeles; Zabalza, Facundo; Issa, João P. Mardegan; Alonso, Matilde; Rodríguez Cabello, José Carlos; Feldman, Sara The morbidity of bone fractures and defects is steadily increasing due to changes in the age pyramid. As such, novel biomaterials that are able to promote the healing and regeneration of injured bones are needed to overcome the limitations of auto-, allo-, and xenografts, while providing a ready-To-use product that may help to minimize surgical invasiveness and duration. In this regard, recombinant biomaterials, such as elastin-like recombinamers (ELRs), are very promising as their design can be tailored by genetic engineering, thus allowing scalable production and batch-To-batch consistency, among others. Furthermore, they can self-Assemble into physically crosslinked hydrogels above a certain transition temperature, in this case body temperature, but are injectable below this temperature, thereby markedly reducing surgical invasiveness. In this study, we have developed two bioactive hydrogel-forming ELRs, one including the osteogenic and osteoinductive bone morphogenetic protein-2 (BMP-2) and the other the Arg-Gly-Asp (RGD) cell adhesion motif. The combination of these two novel ELRs results in a BMP-2-loaded extracellular matrix-like hydrogel. Moreover, elastase-sensitive domains were included in both ELR molecules, thereby conferring biodegradation as a result of enzymatic cleavage and avoiding the need for scaffold removal after bone regeneration. Both ELRs and their combination showed excellent cytocompatibility, and the culture of cells on RGD-containing ELRs resulted in optimal cell adhesion. In addition, hydrogels based on a mixture of both ELRs were implanted in a pilot study involving a femoral bone injury model in New Zealand white rabbits, showing complete regeneration in six out of seven cases, with the other showing partial closure of the defect. Moreover, bone neoformation was confirmed using different techniques, such as radiography, computed tomography, and histology. This hydrogel system therefore displays significant potential in the regeneration of bone defects, promoting self-regeneration by the surrounding tissue with no involvement of stem cells or osteogenic factors other than BMP-2, which is released in a controlled manner by elastase-mediated cleavage from the ELR backbone.

Reforma agraria y práctica política en el contexto del desarrollo y la modernización, Argentina 1955-1975; Agrarian Reform and Political Practice in the Context of Development and Modernization, Argentina, 1955-1975 Lazzaro, Silvia Beatriz El propósito es el estudio de los proyectos de reforma agraria en Argentina durante el periodo de la expansión capitalista de posguerra y frente al intento de redefinición del proceso de acumulación con el retorno del peronismo, sus condicionantes internacionales y locales, y sus resultados. Nuestra hipótesis sostiene que todos los intentos de la reforma agraria, de los diferentes regímenes políticos del periodo, tuvieron como fin primordial garantizar el predominio de la concentración de la tierra, alejados de toda pretensión de índole redistribucionista. En la estrategia metodológica tiene preeminencia el análisis cualitativo. Ello con base en la consulta, el análisis y la crítica de la bibliografía de la época y la actual, fuentes oficiales, publicaciones periódicas sobre temas rurales, y de las corporaciones agrarias, en el marco de un cometido central que apunta al conocimiento de procesos escasamente abordados desde la historia de manera integral.; The purpose is the study of the agrarian reform projects in Argentina during the period of the post-war capitalist expansion and the attempt to redefine the process of accumulation with the return of peronism; their international and local conditions; and their results. Our hypothesis argues that all the attempts of the agrarian reform, present in the agenda of the different political regimes of the period, had as primary aim to guarantee the predominance of the concentration of the land, away from any pretension of redistribution. In the methodological strategy, the qualitative analysis has preeminence. This is based on the consultation, analysis and criticism of current and current bibliography, official sources, periodicals on rural issues, and agrarian corporations. All this in the context of a central task that aims to the knowledge of processes that have been scarcely approached from History in an integral way.