Competencia electoral en los municipios de la provincia de Santa Fe: un análisis sobre los efectos del Doble Voto Simultáneo y las Primarias Abiertas Simultáneas y Obligatorias (1991-2015) Fernandez, Elias Manuel El objetivo principal de este trabajo es analizar los efectos de las leyes electorales sobre la competencia partidaria llevada a cabo en los municipios de la provincia de Santa Fe, Argentina, a lo largo del período 1991-2015. Durante estos años se aplicaron dos normativas diferentes para la designación de autoridades, tanto a nivel provincial como municipal: en primer lugar, el Doble Voto Simultáneo, un sistema comúnmente conocido como Ley de Lemas (1991-2003), y en segundo lugar, las Primarias Abiertas Simultáneas y Obligatorias (2005-2015). Estas normativas moldearon en forma diferente la coordinación electoral entre partidos, lo cual generó distintos efectos sobre la fragmentación del voto y, particularmente, sobre la distribución de bancas en los Concejos Municipales. Diversas indagaciones previas han puesto el foco en la interacción entre estas leyes y los resultados de las elecciones del orden provincial, pero han omitido el impacto que las mismas han tenido sobre los ámbitos municipales, donde se reparte la mayor cantidad de puestos electivos que se ponen en juego en cada turno electoral. Este estudio se focaliza en este nivel de la competencia partidaria y demuestra que, a pesar de que la distribución de asientos en los órganos legislativos locales es formalmente proporcional, el sistema electoral favorece ostensiblemente a los partidos políticos mayoritarios a medida que el sufragio se fragmenta debido al reducido tamaño de las asambleas.; The main objective of this paper is to analyze the effects of electoral laws on party competition at municipal level in Santa Fe province, Argentina, during the period 1991-2015. Throughout these years, two different normatives for the designation of authorities at provincial and municipal levels were applied: First, the Double Simultaneous Vote, a system commonly known as Lemas Law (1991-2003), and secondly, the Open Primary Simultaneous and Mandatory Elections (2005- 2015). These laws produced different modes of electoral coordination between parties, generating different effects on the fragmentation of vote, and particularly on the distribution of seats in the Municipal Councils. Previous investigations focused on the interaction between these laws and the results of the provincial elections, but omitted the impact on the municipal level, an area where most of the political positions are distributed in each election. This study focuses on this level of party competition and demonstrates that, although the distribution of seats in local legislative Councils is formally proportional, the electoral system favors the major political parties when the suffrage tends to be fragmented, due to the small size of assemblies.

Mitochondrial-DNA phylogenetic information and the reconstruction of human population history: The south american case Postillone, María Bárbara; Perez, Sergio Ivan Mitochondrial DNA (mtDNA) sequences are becoming increasingly important in the study of human population history. Here, we explore the diffferences in the amount of information of diffferent mtDNA regions and their utility for the reconstruction of South American population history. We analyzed six data sets comprising 259 mtDNA sequences from South America: Complete mtDNA, Coding, Control, hypervariable region I (HVRI), Control plus cytochrome b (cytb), and cytb plus 12S plus 16S. The amount of information in each data set was estimated employing several site-by-site and haplotype-based statistics, distances among sequences, neighbor-joining trees, distances among the estimated trees, Bayesian skyline plots, and phylogenetic informativeness profijiles. The diffferent mtDNA data sets have diffferent amounts of information to reconstruct demographic events and phylogenetic trees with confijidence. Whereas HVRI is not suitable for phylogenetic reconstruction of ancient clades, this region, as well as the Control data set, displays information for the demographic reconstruction during the Holocene period, probably because of the high rate of mutation of these regions. As expected, the Complete mtDNA and Coding data sets, displaying slower rates of mutation, present suitable information to estimate the founding subhaplogroups that populated South America and for the reconstruction of ancient demographic events. Our results point out the importance of evaluating the utility of diffferent DNA regions to respond to diffferent questions and problems in the human population studies, mainly considering the time scale of the phenomenon and the informativeness of the molecular region in a particular geographical area.

Fiebre hemorrágica Argentina : conflictos y desafíos para la ciencia en el ámbito rural; Argentine hemorrhagic fever. Challenges and conflicts for science in rural areas Gargano, Cecilia; Piaz, Agustín Gabriel La fiebre hemorrágica argentina (FHA) es una enfermedad viral aguda grave, detectada en 1955, que está radicada en una zona de intensiva actividad agrícola. Este artículo indaga algunas de las líneas de investigación recientes, con el objetivo de analizar continuidades y rupturas en las prácticas médicas y en los grupos sociales identificados como principales grupos de riesgo de la FHA. Para ello, se realiza un somero recorrido por la historia de la enfermedad, y se explora la trayectoria del centro de salud que concentra las investigaciones, la producción y la distribución de la vacuna, el Instituto Nacional de Enfermedades Virales Humanas “Dr. Julio I. Maiztegui” (INEVH). A partir de literatura secundaria especializada, fuentes primarias y entrevistas a investigadores y personal del INEVH, se estudia esta trayectoria institucional y los conflictos presentes en su desarrollo, asociados a problemáticas sociales y económicas del medio rural en el que viven y trabajan tanto los médicos y científicos involucrados como la población afectada.; First detected in 1955, the Argentine hemorrhagic fever (AHF) is a serious acute viral illness located in an area of intensive agricultural activity. This article enquires into some of the recent lines of investigation with the purpose of analyzing how medical practices have continued or ceased to be implemented as well as determining whether the social groups identified as main risk groups of the AHF have seen any variation. In order to do this, a summary of the disease’s history has been made in addition to an investigation on the trajectory of the viral research laboratory that monopolized the research, production and distribution of the vaccine: the Maiztegui National Human Viral Disease Institute (INEVH). Based on primary as well as secondary sources and interviews with researchers and staff from the INEVH, we have studied its institutional career along with the conflicts that appeared in its development. These are associated with social and economic issues of the rural area where physicians, scientists and the affected population live and work.

De Inglaterra a Bariloche: La historia de uno de los árboles más famosos de la ciencia Abramson, Guillermo Todos conocemos la anécdota: Isaac Newton, el genial físico y matemático de la Revolución Científica del siglo XVII, tuvo una de las ideas más influyentes en la historia de la ciencia al ver una manzana cayendo del árbol. Se preguntó si la fuerza que atraía la manzana hacia el centro de la Tierra tendría alguna relación con la fuerza que mantenía a la Luna girando en su órbita. En el Instituto Balseiro tenemos un retoño del famoso manzano de Newton. ¿Cómo lo conseguimos? Y, por otro lado, ¿es cierta la anécdota de que a Newton se le ocurrió la idea de la Gravitación viendo caer una manzana?

El crecimiento urbano de una ciudad turística y las políticas de ordenamiento territorial: El caso de San Carlos de Bariloche y el Plan Director de 1979; Touristic city growth, a case study: San Carlos de Bariloche and its masterplan of 1979 Medina, Víctor Damián La ordenación territorial en las ciudades supone muchas veces el equilibrio de intereses encontrados entre la explotación privada de ciertos espacios y las políticas públicas de planeamiento urbano. Más aún si este equilibrio se enmarca en el crecimiento de una ciudad turística, donde el antagonismo de intereses posiblemente encuentre mayor arraigo. El hecho de que el crecimiento de Bariloche históricamente haya avanzado sobre la costa del lago Nahuel Huapi consigue situar como interrogante el rol del medio natural en las lógicas de ocupación del suelo, pero también permite dirigir la mirada hacia los instrumentos de regulación urbana que puede utilizar el Estado para intervenir en su territorio. Este artículo propone identificar los objetivos principales del Plan Director de 1979 y su expresión normativa, el Código de planeamiento de 1980, para luego analizar su instrumentación efectiva hasta la sanción del nuevo código urbano en 1995. Se concluye que el mercado inmobiliario local define, en última instancia, el crecimiento de la ciudad: reproduce el carácter desigual y disperso de su trama espacial y torna inocuas las iniciativas estatales de planeamiento urbano.; Spatial planning in cities often means the balance of interests between the private exploitation of certain public places and urban planning policies. Moreover if this balance is part of the growth of a tourist town, where antagonism of interests may find more entrenched. The fact that the urban growth of Bariloche has historically advanced on the shore of the Nahuel Huapi Lake gets put as question the role of the natural environment in the logic of land use, but also allows look towards the instruments of urban regulation that the State can use to intervene in the territory. In this direction, this article aims to identify the main objectives of the Master Plan of 1979 and its normative expression, the 1980 planning code, and then analyze its effective instrumentation until the enactment of new urban code in 1995. It is concluded that the local real estate market sets, ultimately, the growth of the city: this reproduces the unequal and dispersed nature of its spatial pattern and becomes harmless State urban planning policies.

Espacialidad y materialidad de un conjunto de unidades domésticas tempranas -CA. 300-600 D.C.- de Anillaco (La Rioja, Argentina); Spatiality and materiality of a set of early household -c. 300-600 AD- of Anillaco (La Rioja, Argentina) Sabatini Vargas, Gabriela Inés; Garate, Enrique Rubén En este trabajo nos proponemos abordar la espacialidad y materialidad de las comunidadesaldeanas entre ca. 300 a 600 d.C. en el piedemonte oriental de la Sierra de Velasco en el área de lalocalidad de Anillaco (Castro Barros, La Rioja). Para ello seleccionamos un conjunto residencial deescala doméstica que nos permitió acercarnos a los primeros procesos formativos de Anillaco y a susprácticas cotidianas. Presentamos los resultados obtenidos del relevamiento y excavación del sitioUchuquita. Analizamos la espacialidad residencial, los rasgos arquitectónicos y la distribución delos conjuntos cerámicos y faunísticos mediante herramientas estadísticas de interpolación Kriging.Así, reconocimos parámetros distribucionales y áreas de concentración del registro cerámico y óseovisualizando la disposición de los objetos, la organización del espacio y las prácticas cotidianasdesarrolladas en los recintos. Distinguimos el Número Mínimo de Vasijas (NMV) según serie finay ordinaria y realizamos análisis arqueofaunísticos identificando patrones de uso y consumo.Observamos que algunos rasgos culturales se prolongaron espacial y temporalmente en otrascuencas de la Sierra de Velasco, dando cuenta de una continuidad en las formas de hacer.; In this paper, we propose a spatial and material approach to the study of the village community that lived between c. 300 and 600 AD in the eastern piedemont of Anillaco’s town (Castro Barros, La Rioja). For this we selected a residential complex of household scale that allows us to determine the first formative processes of Anillaco and the daily practices. We presented the results obtained of surveys and excavations in Uchuquita site. We analyzed from a comprehensive and contextual point of view the residential spatiality, the architectural features and the distribution of the ceramic and faunistic sets, using statistical interpolation tools: Kriging. Thus, we recognized distributional parameters and areas of concentration of the ceramic and bone records, visualizing the arrangement of such objects in the housing areas, the organization of the space and the daily practices developed in them. We distinguished the Number Minimum of Vessels (NMV) according to the fine and ordinary series and we perform archaeofaunistics analysis identifying patterns of use and consumption. We observed that some cultural traits extend spatially and temporally in other basins of the Sierra de Velasco, accounting for continuity in the ways of doing things.

Mecanismos de emplazamiento y destrucción de los domos lávicos asociados a la caldera del cerro Blanco, puna austral; Mechanisms of emplacement and destruction of lava domes related to the Cerro Blanco Caldera, southern Puna Baez, Walter Ariel; Chiodi, Agostina Laura; Bustos, Emilce; Arnosio, José Marcelo; Viramonte, Jose German; Giordano, Guido; Alfaro Ortega, Blanca Beatriz En la Puna Austral se desarrolló durante el Cuaternario un importante sistema de calderas de colapso con depósitos piroclásticos y lavas de composiciones ácidas asociados: El Complejo Volcánico Cerro Blanco. Como parte de su actividad más reciente se destaca la erupción que dio lugar a la caldera del cerro Blanco, a la cual se asocia una serie de domos lávicos cuya buena exposición permite abordar el estudio de los mecanismos de emplazamiento y destrucción de domos de composiciones ácidas. Este trabajo presenta una descripción de la distribución espacial, morfología y características litofaciales de los domos del Complejo Volcánico Cerro Blanco, incluyendo los depósitos piroclásticos asociados a los mismos. Los datos obtenidos permiten inferir que el emplazamiento de los domos se produjo de manera endógena y exógena en función de las variaciones en las tasas de ascenso y efusión del magma, así como en relación con el volumen y duración del emplazamiento de cada cuerpo dómico. La destrucción de los domos fue explosiva (erupciones vulcanianas) y no explosiva (colapsos gravitacionales). Ambas situaciones se vieron favorecidas por tasas de ascenso y efusión globales relativamente bajas. La destrucción gravitacional de los domos se relacionó fundamentalmente a la ocurrencia de morfologías inestables con un importante desarrollo vertical. Las erupciones vulcanianas ocurrieron como resultado de dos mecanismos principales: la sobrepresurización del magma dentro del conducto y la interacción con agua externa. Además ocurrieron explosiones freáticas menores responsables de destruir parcialmente algunos de los cuerpos dómicos.; An important quaternary collapse caldera system associated with acid pyroclastic deposits and lavas was developed in the Southern Puna: Cerro Blanco Volcanic Complex. The most important recent activity was the caldera forming Cerro Blanco eruption which has a series of lava domes related. The good exposure of these domes provides the opportunity to study the mechanisms of growth and destruction of silicic lava domes. This paper presents a description of the spatial distribution, morphology and lithofacial characteristics of the lava domes related to the Cerro Blanco Volcanic Complex, including the associated pyroclastic deposits. The data obtained suggest that the growth of the domes was both endogenous and exogenous in response to variations in ascent and effusion rate, as well as in function of volume and span of growth of each dome. The destruction of the lava domes was explosive (vulcanian eruptions) and non-explosive (gravitational collapses). Both situations were favored by slow ascent and effusion rate. The gravitational destruction of the domes occurs as a result of the instability of domes with large vertical development. The vulcanian eruptions occur as a result of two main processes: magma pressurization into the conduit and external water input. Also minor phreatic explosions destroyed partially some of the domes.

New provenience analysis of Late Holocene archaeological obsidians from southern Patagonia (Santa Cruz province, Argentina) Nami, Hugo Gabriel; Giesso, Martín; Castro, Alicia Susana; Glascock, Michael X-ray fluorescence (XRF) and neutron activation analysis (NAA) methods were employed on a sample of obsidians from Santa Cruz province (southern Argentina). Results obtained from 81 specimens from two sources and a number of archaeological sites located in NE and SE Santa Cruz shows that the obsidians contain trace elements indicating diverse origins.

Juegos de lenguaje sociales y palabras que dañan. Un estudio sobre la interpretación aplicada de la obra del segundo Wittgenstein Gamero Cabrera, Isabel Gloria En este artículo voy a profundizar en una interpretación aplicada de la obra del segundo Wittgenstein, propuesta por José Medina, Miranda Fricker y Peg O’Connor, entre otros. Estos autores equiparan juegos de lenguaje y formas de vida, entienden las reglas de los juegos como normas sociales y trasladan la argumentación del filósofo vienés a un ámbito sociopolítico. Concretamente, José Medina propone un argumento en oposición a los juegos de lenguaje sociales, que es la versión social al argumento de Wittgenstein en oposición a los juegos de lenguaje privados. En segundo lugar, analizaré dos casos: las distintas denominaciones de los indios huicholes y el uso del plural inclusivo por parte de algunos feminismos. Lo más interesante de estos dos casos es que estos grupos proponen significados privados o usos del lenguaje que sólo parecen ser válidos para ellos. Preguntaré si estos usos se pueden entender como juegos de lenguaje sociales y ser criticados desde los argumentos de Medina. Este estudio de casos servirá para evaluar la adecuación, validez y límites de esta interpretación de la obra de Wittgenstein.; The main aim of this paper is to study in depth an applied interpretation of the later Wittgenstein’s work, developed by José Medina, Miranda Fricker and Peg O’Connor, among other authors. They equate the concepts of “language-games” and “forms of life”, understand the rules of the games as social norms and place Wittgenstein’s arguments in the socio-political field. Specifically, José Medina coins an argument against social language-games, which is the social version of Wittgenstein’s argument against private language-games. Secondly, I will analyse two cases: the different denominations of the Huichol Indians and the uses of the inclusive plural proposed by some feminists. The main interest of these cases is that both groups propose private meanings or particular uses of some terms, which seems to be valid just for them. I will ask whether these uses can be understood as social language-games and thus be criticised by Medina’s arguments. This case analysis is addressed to evaluate the accuracy, validity and the limits of this interpretation of Wittgenstein’s work.

Paisas y gringos. Neorruralidad serrana, transformaciones relacionales e identidades emergentes, Argentina; Paisans and gringos. Highland neo-rurality, relational transformations, and emerging identities in Córdoba, Srgentina Trimano, Luciana Geraldine En las últimas décadas, los pueblos “rurales” del valle de Traslasierra, en la provincia de Córdoba, Argentina, experimentaron un proceso de transformación debido al impacto de la movilidad urbana. Desde la mirada etnográfica de un estudio de caso en la localidad serrana de Las Calles, analizamos una tendencia poblacional que involucra a sectores inmigrantes de clase media y alta. Los sujetos son etiquetados por la sociedad receptora con el nombre de “gringos”, por detentar capital económico, cultural y simbólico, pero sobre todo por ser una segunda oleada migratoria que siguió a la primera, protagonizada por inmigrantes ingleses a partir de la década de 1940. De modo transdisciplinar, reflexionamos acerca de un modelo de sociabilidad al que denominamos círculo iluminado para comprender rasgos de la “neorruralidad” argentina; For the last twenty years, “rural” towns in the Valle de Traslasierra, in the province of Córdoba, Argentina, have undergone fast social transformations attributed to the impact of urban migrations. Through an ethnographic case study in the hill town of Las Calles, we analyse the features of a population trend involving middle and upper class sectors from the big cities. These “neo-rural” subjects are tagged by the receiving society as “gringos” both because they flaunt financial, cultural, and symbolic capital, and also because they are a second migratory wave after the one started in the 1940s which involved English immigrants. Based on a transdisciplinary approach, we will reflect on the establishment of a sociability model we have named illuminated circle. Said conceptualization helps understand certain traits in the Argentinean “neo-rurality” phenomenon

Sellars on perceptual knowledge Kalpokas, Daniel Enrique In Empiricism and the Philosophy of Mind, after criticizing one of the forms that the Myth of the Given adopts, Sellars presents his own conception of epistemic justification. This conception, along with his criticism of the framework of the Given, has had a great impact on the analytic philosophy of the second half of twentieth century, an impact that still persists today. In this article, I aim to examine Sellars’s theory of epistemic justification in order to highlight two important problems with it. The first concerns the justification of observation reports; the second concerns the understanding of those reports. I argue that those problems do not find a suitable solution within Sellars’s theory of observational knowledge. My diagnosis is that the root cause of those problems lies in an inadequate conception of perceptual experience. This prevents Sellars from realizing the essential epistemic role that experience plays in the justification and understanding of such particular statements.

Influence of extrusion process conditions on starch film morphology González Seligra, Paula Fabiana; Guz, Lucas Martín; Ochoa Yepes, Oswaldo Juan; Goyanes, Silvia Nair; Fama, Lucia Mercedes The conditions of extrusion process for food packaging are determinant on their morphology and, as consequence, on their functionality. The effect of the screw speed of a starch-glycerol system extruded at the same temperature profile was evaluated. The process at 80 rpm led to a material with the starch completely gelatinized, while the systems fabricated at 40 rpm and 120 rpm presented broken starch grains. The morphology and density of the broken grains depended on the screw speed. The material at 120 rpm showed broken grains with smaller size and lower concentration than that observed in the system at 40 rpm. After pressing at 120 rpm, the film formed (TPS120) resulted similar than that at 80 rpm (TPS80), while the film at 40 rpm (TPS40) kept some broken grains. TGA of the material obtained at 40 rpm showed more than one degradation process of the glycerol due to the inhomogeneous glycerol dispersion. DRX revealed more cristallinity in TPS40, being TPS120 the most amorphous. TPS80 had the highest strain at break while the others the higher modulus and stress at break. Water vapor permeability of TPS80 and TPS120 showed similar results and lower than TPS40.

Optical function of the finite-thickness corrugated pellicle of euglenoids Inchaussandague, Marina Elizabeth; Skigin, Diana Carina; Dolinko, Andrés Ezequiel We explore the electromagnetic response of the pellicle of selected species of euglenoids. These microorganisms are bounded by a typical surface pellicle formed by S-shaped overlapping bands that resemble a corrugated film. We investigate the role played by this structure in the protection of the cell against UV radiation. By considering the pellicle as a periodically corrugated film of finite thickness, we applied the C-method to compute the reflectance spectra. The far-field results revealed reflectance peaks with a Q-factor larger than 103 in the UV region for all the illumination conditions investigated. The resonant behavior responsible for this enhancement has also been illustrated by near-field computations performed by a photonic simulation method. These results confirm that the corrugated pellicle of euglenoids shields the cell from harmful UV radiation and open up new possibilities for the design of highly UV-reflective surfaces.

De oasis a desierto: Re-emergencias huarpes y la promesa del agua en las Lagunas de Guanacache Calderon Archina, Maria Aldana El presente trabajo retoma discusiones y reflexiones que fueron planteadas en mi Trabajo Final de la Licenciatura en Antropología. Puntualmente aquí me interesa retomar lo desarrollado en relación a la problemática del agua que afecta desde hace décadas al área de las (desecadas) Lagunas de Guanacache, centro oeste argentino, donde habita población rural y comunidades indígenas huarpes. Más específicamente, focalizaré en las Lagunas como punto de identificación de las historias de vida huarpe y cómo la falta de agua devino en tema de agenda e intervención estatal. Asimismo, ambas cuestione se encuentran articuladas y facilitaron el proceso de comunalización (Brow, 1990) de un grupo de familias autoadcriptas como huarpes del paraje La Represita, una pequeña localidad sanluiseña ubicada en el límite provincial con San Juan. De esta manera, parte de la apuesta de este artículo está en reconstruir a través de la problemática del agua el proceso de re-emergencia de un grupo de familias autoadscriptas como huarpes.

Habitats of ancient hunter-gatherers in the Puna: Resilience and discontinuities during the Holocene Yacobaccio, Hugo Daniel; Morales, Marcelo Raul; Hoguin, Rodolphe Hunting groups are closely linked to the environments in which they live, especially in the deserts. This paper explores the relationship between people and desert environments in the long term using key concepts such as resilience, refugia and habitat loss. A thorough paleoenvironmental analysis was conducted to improve our understanding about continuities and discontinuities in the archaeological record of the South Andean highlands. This allowed us to test ideas about the availability of adequate human habitats during the Holocene. Cultural archives such as archaeofauna and lithic technology are employed to illustrate and discuss methodological perspectives for the identification and description of resilient human habitats in arid landscapes in the South Andean Puna.

Improving diabetes care at primary care level with a multistrategic approach: results of the DIAPREM programme Prestes, Mariana; Gayarre, Maria A.; Elgart, Jorge Federico; Gonzalez, Lorena; Rucci, Enzo; Paganini, Jose M.; Gagliardino, Juan Jose To present results, 1 year postimplementation at primary care level, of an integrated diabetes care programme including systemic changes, education, registry (clinical, metabolic, and therapeutic indicators), and disease management (DIAPREM).

Lyapunov exponents and poles in a non Hermitian dynamics Gomez, Ignacio Sebastián By means of expressing volumes in phase space in terms of traces of quantum operators, a relationship between the poles of the scattering matrix and the Lyapunov exponents in a non Hermitian quantum dynamics, is presented. We illustrate the formalism by characterizing the behavior of the Gamow model whose dissipative decay time, measured by its decoherence time, is found to be inversely proportional to the Lyapunov exponents of the unstable periodic orbits. The results are in agreement with those obtained by means of the semiclassical periodic–orbit approach in quantum resonances theory but using a simpler mathematics.

Anisotropic BV–L2 regularization of linear inverse ill-posed problems Mazzieri, Gisela Luciana; Temperini, Karina Guadalupe; Spies, Ruben Daniel During the last two decades several generalizations of the traditional Tikhonov-Phillips regularization method for solving inverse ill-posed problems have been proposed. Many of these variants consist essentially of modifications on the penalizing term, which force certain features in the obtained regularized solution ([11,18]). If it is known that the regularity of the exact solution is inhomogeneous it is often desirable the use of mixed, spatially adaptive methods ([7,12]). These methods are also highly suitable when the preservation of edges is an important issue, since they allow for the inclusion of anisotropic penalizers for border detection ([20]). In this work we propose the use of a penalizer resulting from the convex spatially-adaptive combination of a classic L2penalizer and an anisotropic bounded variation seminorm. Results on existence and uniqueness of minimizers of the corresponding Tikhonov-Phillips functional are presented. Results on the stability of those minimizers with respect to perturbations in the data, in the regularization parameter and in the operator are also established. Applications to image restoration problems are shown.

Mancha angular del poroto: avances en su investigacion en la EEAOC; Angular leaf spot of common bean: advances on its research at the EEAOC Mamani Gonzales, Silvana Yacqueline; Vizgarra, Oscar N.; Espeche, Clara M.; Mendez, Diego Eduardo; Ploper, Leonardo Daniel La mancha angular del poroto causada por el hongo Pseudocercospora griseola afecta el rendimiento y la calidad de la semilla. En Argentina esta enfermedad fue convirtiéndose gradualmente en una limitante del cultivo, por lo que sumanejo es un aspecto importante a tener en cuenta en la producción de poroto. En el presente trabajo se describen brevemente los resultados de las actividades llevadas a cabo por el proyecto Legumbres Secas de la Estación ExperimentalAgroindustrial Obispo Colombres (EEAOC) en la búsqueda de resistencia genética a esta enfermedad. Los trabajos comenzaron con la introducción de germoplasma desde el Centro Internacional de Agricultura Tropical a partir del cual seliberó TUC 550, la primera variedad resistente a mancha angular en Argentina. En la siguiente etapa se realizaron cruzamientos locales, utilizando como parentales resistentes los materiales seleccionados en las primeras valuaciones. Se obtuvieron así líneas avanzadas de poroto negro con niveles de resistencia superiores a los conseguidos en la etapa previa. También se identificaron nuevos parentales para futuras combinaciones, teniendo en cuenta que el trabajo de mejoramiento genético debe ser continuo debido a la alta variabilidad patogénica que presenta P. griseola.Palabras clave: evaluación de germoplasma, resistencia a Pseudocercospora griseola; Angular leaf spot of common bean, caused by the fungus Pseudocercospora griseola, affects yield and quality of bean seed. In Argentina this disease became gradually a limiting factor for the crop, so its management is an important aspect to consider in common bean production. In this work, the activities carried out by the Legumbres Secas project of the Estación Experimental Agroindustrial Obispo Colombres (EEAOC) in the search for genetic resistance to this disease are presented briefly. This work began with the introduction of germplasm from the International Center for Tropical Agriculture from which the variety TUC 550 was released, the first variety with resistance to angular leaf spot in Argentina. In the next stage, the project has carried out local crosses using as resistant parents those genotypes selected in the first evaluations. Advanced black bean lines were obtained with higher levels of resistance than those obtained in the previous stages. Also, new potential parents were identified for future combinations, considering that breeding for angular leaf spot resistance should be continuous because of the high pathogenic variability exhibited by P. griseola.

Fungal diversity at fragmented landscapes: synthesis and future perspectives Grilli, Gabriel; Longo, Maria Silvana; Huais, Pablo Yair; Pereyra, Mariana; Verga, Ernesto Gustavo; Urcelay, Roberto Carlos; Galetto, Leonardo Fungi are organisms with important roles in ecosystem functioning and services, but knowledge about how habitat fragmentation affect fungal diversity is biased by experimental approaches and it is spread in different trophic groups. We analyzed the empirical evidences of fungal diversity in fragmented landscapes, and proposed future perspectives for the study of these organisms under land use changes. Fungal diversity might be negatively affected by habitat fragmentation; however, this trend may differ in magnitude depending on fungal groups and their nutritional habits. In addition, due to the fact that fungal diversity at fragmented landscapes has been studied mainly through few indicators (e.g. isolation, area and edge effect); we propose incorporating the landscape structure and accurate spatio-temporal scales to the study of fungal diversity responses to fragmented landscapes. Together, this methodological refinement may allow improving knowledge on fungi when designing proper strategies for landscape management.