Chemical catalyzed recycling of polymers: catalytic conversion of PE, PP and PS into fuels and chemicals over H-Y Lerici, Laura Carolina; Renzini, Maria Soledad; Pierella, Liliana Beatriz In the following study the termocatalytic degradation of polyethylene of high and low density, (HDPE, LDPE), polypropylene (PP) and polyestyrene (PS) on the H-Y zeolite was performed. The catalytic activity was carried out in a batch reactor at 500 °C. The reaction time was 43,75 min. Liquid product yields ranged from ~42 and ~44% wt% for polyethylenes and PP, while the production of PS showed ~71 wt%. The gaseous products ranged between ~46 and ~52 for PE and PP and ~24 wt% for PS. The PP generated the greatest amount of carbonaceous residues (~10 wt%) whereas the LDPE produced the lowest (~4 wt%).

Influence of the synthesis time in the textural and structural properties of Ni-Containing Mesoporous materials Carraro, Paola María; Eimer, Griselda Alejandra; Oliva, Marcos Iván MCM-41 materials have been synthesized by hydrothermal synthesis, and the influence of the synthesis time variation on the structural and textural properties of the final solids was studied. Nickel-modified samples were synthesized with a molar ratio Si/Ni of 60 and increased days of synthesis from 0 to 7 days. The structures obtained were characterized by X-ray diffraction (XRD) and UV-vis diffuse reflectance (UV–Vis DRS) spectroscopy. XRD patterns of samples are typical of MCM-41 structure, which improves with increasing the time of hydrothermal treatment. XRD and UV–vis studies revealed that the short synthesis times do not allow the proper incorporation of nickel in the structure. It was corroborated that, the synthesis time has an important influence on the properties of mesoporous material modified with Ni.

Preliminary data on growth and enzymatic abilities of soil fungus Humicolopsis cephalosporioides at different incubation temperatures; Datos preliminares sobre el crecimiento y la capacidad enzimática del hongo de suelo Humicolopsis cephalosporioides a diferentes temperaturas de incubación Eliades, Lorena Alejandra; Cabello, Marta N.; Pancotto, Veronica Andrea; Moretto, Alicia Susana; Rago, María Melisa; Saparrat, Mario Carlos Nazareno Background Nothofagus pumilio (Poepp & Endl.) Krasser, known as “lenga” is the most important timber wood species in southernmost Patagonia (Argentina). Humicolopsis cephalosporioides Cabral & Marchand is a soil fungus associated with Nothofagus pumilio forests, which has outstanding cellulolytic activity. However, there is no information about the ability of this fungus to use organic substrates other than cellulose, and its ability to produce different enzyme systems, as well as its response to temperature. Aims The aim of this study was to examine the role of H. cephalosporioides in degradation processes in N. pumilio forests in detail by evaluating the in vitro ability of four isolates of this fungus to grow and produce different lytic enzyme systems, and their response to incubation temperature. Methods The ability of the fungi to grow and produce enzyme systems was estimated by inoculating them on agar media with specific substrates, and the cultures were incubated at three temperatures. Results A differential behavior of each strain in levels of growth and enzyme activity was found according to the medium type and/or incubation temperature. Conclusions A intra-specific variability was found in H. cephalosporioides. Likewise a possible link between the saprotrophic role of this fungus in N. pumilio forests and the degradation of organic matter under stress conditions, such as those from frosty environments, was also discussed.; Antecedentes Nothofagus pumilio (Poepp & Endl) Krasser (N. pumilio), conocido como «lenga», es la especie maderable más importante en el extremo sur de Patagonia (Argentina). Humicolopsis cephalosporioides Cabral & Marchand es un hongo del suelo asociado a bosques de N. pumilio, que tiene una actividad celulolítica excepcional. Sin embargo, no hay información acerca de la capacidad de este hongo para utilizar otros sustratos orgánicos distintos de la celulosa, o para producir diferentes sistemas enzimáticos, así como su respuesta a la temperatura. Objetivos El objetivo de este estudio fue profundizar en el rol que Humicolopsis cephalosporioides tiene en los procesos de degradación en los bosques de N. pumilio a través de la evaluación de la capacidad in vitro de 4 aislamientos de este hongo para crecer y producir diferentes sistemas enzimáticos líticos y su respuesta a la temperatura de incubación. Métodos La capacidad de los hongos para crecer y producir sistemas enzimáticos se estimó a través de su inoculación sobre medios de agar con sustratos específicos, siendo incubados a 3 temperaturas. Resultados Se observó un comportamiento diferencial de cada cepa en el crecimiento y la actividad enzimática de acuerdo con el tipo de medio o la temperatura de incubación. Conclusiones Se observó variabilidad intraespecífica en Humicolopsis cephalosporioides. Asimismo, se discutió la posible relación entre el rol saprotrófico de este hongo en los bosques de N. pumilio y la degradación de la materia orgánica en condiciones estresantes, como las existentes en ambientes fríos.

Ontogeny of the extrafloral nectaries of Vigna adenantha (Leguminosae, Phaseolae) and its relation with floral development Ojeda, Fabiana Soledad; Hoc, Patricia Susana; Galati, Beatriz Gloria; Amela Garcia, Maria Teresa Background: The inflorescences of the genus Vigna Savi have extrafloral nectaries (EFNs) among the flowers whose origin is still unknown. The disposition, anatomy and morphology, as well as the ontogeny of the extrafloral nectaries (EFNs) associated with the inflorescences of Vigna adenantha (G.F.W. Meyer) Maréchal, Mascherpa & Stainier (Leguminosae, Papilionoideae, Phaseolae) were studied. Besides, the ultrastructure of the secretory stage was described. Results: The inflorescence, a raceme, bears a brief globose secondary axis in each node with 2 flowers and 5–7 EFNs, which develop in acropetal direction. Each EFN originates from the abscission of a flower bud that interrupts its development, resulting in an elevated EFN. This secretory structure is formed by a ring of epidermal and parenchymatic cells surrounding a group of elongated central cells. The nectary is irrigated by phloem and xylem. Four developmental stages proceed; each one relates to a different embryological stage of the flowers in each secondary axis. Conclusions: The first functional EFN of each secondary axis of the inflorescence reaches its maturity when both the pollen grains and the embryo sacs are completely developed and the flowers begin to open. The secretion is granulocrine. The following EFNs develop in the same way. Keywords: Extrafloral nectaries Inflorescences Ontogeny Morphology Anatomy Ultrastructure Vigna Leguminosae

Synthesis of divalent ligands of β-thio- and β-N-galactopyranosides and related lactosides and their evaluation as substrates and inhibitors of Trypanosoma cruzi trans-sialidase Cano, María Emilia; Agusti, Rosalia; Cagnoni, Alejandro; Tesoriero, María Florencia; Kovensky, José; Uhrig, Maria Laura; Muchnik, Rosa In this work we describe the synthesis of mono- and divalent β-N- and β-S-galactopyranosides and related lactosides built on sugar scaffolds and their evaluation as substrates and inhibitors of the Trypanosoma cruzi trans-sialidase (TcTS). This enzyme catalyzes the transfer of sialic acid from an oligosaccharidic donor in the host, to parasite βGalp terminal units and it has been demonstrated that it plays an important role in the infection. Herein, the enzyme was also tested as a tool for the chemoenzymatic synthesis of sialic acid containing glycoclusters. The transfer reaction of sialic acid was performed using a recombinant TcTS and 3'-sialyllactose as sialic acid donor, in the presence of the acceptor having βGalp non reducing ends. The products were analyzed by high performance anion exchange chromatography with pulse amperometric detection (HPAEC-PAD). The ability of the different S-linked and N-linked glycosides to inhibit the sialic acid transfer reaction from 3'-sialyllactose to the natural substrate N-acetyllactosamine, was also studied. Most of the substrates behaved as good acceptors and moderate competitive inhibitors. A di-N-lactoside showed to be the strongest competitive inhibitor among the compounds tested (70% inhibition at equimolar concentration). The usefulness of the enzymatic trans-sialylation for the preparation of sialylated ligands was assessed by performing a preparative sialylation of a divalent substrate, which afforded the monosialylated compound as main product, together with the disialylated glycocluster.

Progesterone receptor activation downregulates GATA3 by transcriptional repression and increased protein turnover promoting breast tumor growth Izzo, Franco; Mercogliano, María Florencia; Venturutti, Leandro; Tkach, Mercedes; Inurrigarro, Gloria; Schillaci, Roxana; Cerchietti, Leandro; Elizalde, Patricia Virginia; Proietti Anastasi, Cecilia Jazmín The transcription factor GATA3 is involved in mammary gland development and is crucial for the maintenance of the differentiated status of luminal epithelial cells. The role of GATA3 in breast cancer as a tumor suppressor has been established, although insights into the mechanism of GATA3 expression loss are still required.

Pyrolysis of sunflower seed hulls for obtaining bio-oils Casoni, Andrés Iván; Bidegain, Maximiliano Andrés; Cubbito, María Amelia; Curvetto, Nestor Raul; Volpe, María Alicia Bio-oils from pyrolysis of as received sunflower seed hulls (SSH), hulls previously washed with acid (SSHA) and hulls submitted to a mushroom enzymatic attack (BSSH) were analyzed. The concentration of lignin, hemicellulose and cellulose varied with the pre-treatment. The liquid corresponding to SSH presented a relatively high concentration of acetic acid and a high instability to storage. The bio-oil from SSHA showed a high concentration of furfural and an appreciable amount of levoglucosenone. Lignin was degraded upon enzymatic activity, for this reason BSSH led to the highest yield of bio-oil, with relative high concentration of acetic acid and stability to storage.

De la localización a la movilidad: propuestas teórico-metodológicas para abordar la segregación espacial urbana; From isolation to mobility: theoretical- methodological proposals to understand urban spatial segregation Mera, Gabriela Silvina La noción de segregación espacial es una categoría frecuentemente utilizada en el campo académico para analizar la distribución espacial de la población urbana. A pesar de su extensa aplicación y de los debates teóricos que, en los últimos años, se han desarrollado en torno a ella, han sido escasos los esfuerzos por trasladar estas problematizaciones a propuestas metodológicas críticas e integradoras. El presente artículo se propone constituir un aporte en este sentido. Por un lado, recuperando los principales debates entre los estudios especializados y en la sociología urbana para definir esta noción; y, por otro lado, retomando críticamente algunas herramientas metodológicas utilizadas para medirla. Se propone así una definición compuesta de segregación espacial que contemple tanto la distribución espacial (localización residencial) como las prácticas urbanas cotidianas, interacciones y dinámicas de accesibilidad-exclusión (movilidad), en el marco de las cuales las diferencias y distancias se construyen como tales.
; The notion of spatial segregation is a category often used by scholars to analyze the spatial distribution of urban populations. Despite its extensive application and the recent theoretical debates about it, there have been few efforts to translate these issues into critical and integrated methodological proposals. This article aims to make a contribution in this regard. On one hand, reviewing the major debates to define this notion, among specialized studies and urban sociology; and, on the other, critically revisiting some methodological tools used to measure it. It thus proposes a definition of spatial segregation, composed of spatial distribution (residential location) as well as daily urban practices, interactions and accessibility-exclusion dynamics (mobility), under which differences and distances are constructed.

Insights in the kinetic mechanism of the eukaryotic Baeyer-Villiger monooxygenase BVMOAf1 from Aspergillus fumigatus Af293 Mascotti, María Laura; Kurina Sanz, Marcela Beatriz; Juri Ayub, Maximiliano; Fraaije, Marco Wilhelmus This work reports a detailed kinetic study of the recently discovered BVMOAf1 from Aspergillus fumigatus Af293. By performing steady state and pre-steady state kinetic analyses, it was demonstrated that the rate of catalysis is partially limited by the NADPH-mediated reduction of the flavin cofactor, a unique hallmark of BVMOAf1. In addition, the oxygenating C4a-(hydro)peroxyflavin intermediate could be spectrophotometrically detected and it was found to be the most stable among all analyzed BVMOs. To assess the possible influence of some residues on the kinetic features, model-inspired site-directed mutagenesis was performed. Among the mutants, the Q436A variant showed a slightly broader substrate scope and a better catalytic efficiency. In summary, this study describes for the first time the kinetic parameters for an eukaryotic BVMO.

El efecto de las estructuras de defensa costera en las localidades de Mar Chiquita y Mar de Cobo, provincia de Buenos Aires; The effect of coastal protective structures in Mar Chiquita and Mar de Cobo, Buenos Aires province San Martín, Laura; Bunicontro, Maria Paula; Marcomini, Silvia Cristina; López, Rubén Álvaro La zona localizada entre Mar de Cobo y Mar Chiquita presenta las mayores tasas de erosión del litoral atlántico de laprovincia de Buenos Aires.Esta zona costera evidenció, a lo largo del tiempo, un significativo retroceso de la línea de costa, pero también másrecientemente, las estructuras construidas con la finalidad de mitigar los fenómenos erosivos, han contribuido conimportantes modificaciones al sector costero, sin una planificación regional.Las causas del proceso erosivo tienen origen natural, pero se han potenciado por distintas actividades humanas, que afectarona la deriva litoral, desde la localidad de Mar del Plata a Mar Chiquita.El presente trabajo tiene como finalidad, en primer lugar, realizar un relevamiento y caracterización de las estructuras dedefensa costera, la evaluación del ambiente afectado en cada caso y su clasificación por clase funcional. En segundo lugar sepropone una metodología sencilla para cuantificar el área de influencia de los espigones, que representan la obra de defensamás abundante en la zona, calculada a partir de la longitud del espigón y la extensión de las zonas de acumulación yerosión.Finalmente, se demuestra que existe una relación cuantitativaentre la longitud de los distintos tipos de espigones y sus áreasde influencia, tanto al sur como al norte, según la derivalitoral y su interacción con la dinámica local.; The area located between Mar de Cobo and Mar Chiquita shows the highest rates of erosion from the Atlantic coast of Buenos Aires province. This coastal zone showed over time a significant retreat of the coastline, but also more recently, the structures built to mitigate the erosive phenomenon, have contribute with important changes, without any regional planning. The causes of the erosive process have natural origin, but have been enhanced by different human activities that affected the littoral drift, from Mar del Plata resort to Mar Chiquita. The present work aims, on one hand, to perform the survey and characterization of all the coastal protection structures, the evaluation of the local environment affected and its classification by functional class. Secondly, a simple methodology is proposed to quantify the influence area of the most conspicuous structure in the area, the groins, calculated from the length of the groin and the extent of the erosion and accumulation areas. Finally, a quantitative relation is demonstrated between the length of the different type of groins and its influence area, both south and north, according to the littoral drift and its interaction with the local dynamics.

Requerimientos pregerminativos de maihuenia patagonica y maihueniopsis darwinii, cactáceas endémicas de patagonia; Pre-germinative requirements of maihuenia patagonica and maihueniopsis darwinii, endemic cacti from Patagonia Masini, Ana Carla Ailín; Rovere, Adriana; Pirk, Gabriela Inés Cacti are characteristic plants in arid ecosystems, where they play an important ecological role. Many species are threatened because of habitat destruction and collection for commercial purposes. In South America, Argentina is one of the countries with the greatest cacti richness and endemisms. However, cacti have been scarcely studied, especially the southernmost species. Since the study of cacti’s reproductive biology would help to improve their conservation status, we studied basic physiological aspects of the germination of two endemic species of Argentina and Chile, Maihuenia patagonica (Phil.) Britton & Rose and Maihueniopsis darwinii (Hensl.) F. Ritter var. hickenii (Britton & Rose) R. Kiesling. Germination percentage (G), mean germination time (TMG) and time until germination (IG) of control seeds and seeds subjected to three pre-germinative treatments were evaluated. Treatments were cold moist stratification for 40 days, mechanical scarification with sand and sandpaper, and mechanical scarification with a scalpel. Laboratory assays were performed at 20/10 °C and 12 h light/12 h dark regime during 60 days. In M. patagonica germination in the stratification treatment did not differ from the control, but was higher in the scarification with scalpel. In M. darwinii var. hickenii germination only differed between the stratification and the scarification with scalpel. TMG and IG were higher in the stratification treatment than in the control for M. patagonica, whereas scarification treatments did not differ from the control. As for M. darwinii var. hickenii no differences were detected for TMG, but the IG was lower in the stratification than in the control. Probably both species presents some kind of dormancy, since germination percentages were low (M. patagonica between 8-27 % and M. darwinii var. hickenii between 17-26 %) but seeds presented high viability. Presence of physical dormancy is discarded because control seeds of both species germinated and the presence of non deep physiological dormancy is proposed. The latter was partially overcome by mechanical scarification in M. patagonica. These results are a new contribution to the study of cacti in South America and could help to develop in situ conservation strategies through the restoration of degraded areas.

Assessment of the pollen diet in a wood-dwelling augochlorine bee (Halictidae) using different approaches Dalmazzo, Maria de Los Milagros; Vossler, Favio Gerardo Most studies on bee pollen diet are based on the abundance of each pollen type composing honey or pollen stores of whole nests (pollen counts). In an effort to characterize the diet of the augochlorine bee Augochlora amphitrite, we employed nest and intra-nest pollen analyses and bee flower visitation. In addition, we tested a novel approach, the Index of Relative Importance (IRI), a method that combines pollen counts, pollen volume and frequency of pollen occurrence. Using nest pollen analysis we found that the Ludwigia type dominated pollen counts, comprising 56% of whole nests, and thus would have concluded that this is the only most important pollen source in the diet. Instead we found seven other important sources including Ipomoea alba, I. cairica, Gymnocoronis spilanthoides and Pavonia types as well as 26 new floral hosts using all four methods in combination. Thus, we recommend that other studies of bee diet include these other approaches when possible, and especially the novel approach of IRI.

Foot-and-mouth disease vaccination induces cross-reactive IFN-γ responses in cattle that are dependent on the integrity of the140S particles Bucafusco, Danilo; Di Giacomo, Sebastián Víctor; Pega, Juan Franco; Schammas, Juan Manuel; Cardoso, Nancy Patricia; Capozzo, Alejandra Victoria; Pérez Filgueira, Daniel Mariano Interferon-γ (IFN-γ) recall responses against foot-and-mouth disease virus (FMDV) in FMD vaccinated cattle are utilized to study T-lymphocyte immunity against this virus. Here, a recall IFN-γ assay based on a commercial ELISA was set up using 308 samples from naïve and vaccinated cattle. The assay was used to study cross-reactive responses between different FMDV vaccine strains. Blood samples from cattle immunized with monovalent vaccines containing A24/Cruzeiro/Brazil/55, A/Argentina/2001 or O1/Campos/Brazil/58 strains were tested using purified-inactivated FMDV from homologous and heterologous strains. A24/Cruzeiro was the most efficient IFN-γ inducer in all vaccinated animals, both when included in the vaccine or as stimulating antigen. We demonstrate that this was mainly due to the structural stability of the whole viral particle. These results show that IFN-γ production relies on the presence of 140S particles that can maintain their integrity along the incubation process in vitro, and throughout the vaccine´s shelf-life, when used in vivo.

Los debates de la historia de la danza: ¿un diálogo imposible? Vallejos, Juan Ignacio Este artículo busca, en principio, caracterizar los diferentes modelos de la historiografía de la danza. La historia de la danza ha ido complejizando su capacidad de análisis luego del abandono de los primeros enfoques teleológicos. En la década del noventa tiene lugar un doble desplazamiento que busca, por un lado, actualizar la metodología tradicional de la especialidad y, por el otro, redefinirla sobre la base de su integración a los estudios culturales. Nuestra tesis sostiene que el modelo de la historia cultural, sin pretender ser una opción superadora, provee un camino para el diálogo entre enfoques opuestos en la historia de la danza.

Identificación de mayólica holandesa en la Buenos Aires del siglo XVII; Identification of dutch delftware in seventeenth-century Buenos Aires Zorzi, Flavia En esta nota se dan a conocer dos piezas correspondientes a un particular tipo de mayólica, no muy frecuente en los sitios arqueológicos de la Argentina, al que nos referimos como “Delft Blanco Lobulado”. Se describen las características macroscópicas de las piezas estudiadas -que fueron halladas en contextos del siglo XVII en el sitio Bolívar 373 (ciudad de Buenos Aires)- y se proporcionan algunos datos vinculados a su identificación y contextualización. Sugerimos que los ejemplares hallados en la Argentina podrían proceder de alfares holandeses, y consisten en una emulación de los conocidos “Bianchi”, producidos desde el siglo XVI en Faenza, Italia, e imitados durante el siglo siguiente en otras áreas de Europa.; This paper brings to light two pots of a particular type of tin glazed pottery that is uncommon on Argentinean archaeological sites, which we refer to as “White lobed Delft”. The macroscopic characteristics of the pots–, which were found in seventeenth-century contexts at the Bolívar 373 site, Buenos Aires city, are described and data for their identification and contextualization provided. It is suggested that the specimens found in Argentina could come from Dutch workshops, and consist of an emulation of the well-known “Bianchi” type produced in Faenza, Italy since the sixteenth century and imitated during the following century in other areas of Europe.

El peronismo y las urnas: oficialismo y oposición en instancias electorales (Río Cuarto, 1946-1951); The Peronism and the polls: ruling and opposition electoral instances (Río Cuarto, 1946-1951) Camaño, Rebeca Raquel La intervención federal derivada del golpe de Estado de 1943 dio por terminadas las funciones de los intendentes y concejos deliberantes de la provincia de Córdoba. Pese a las esperanzas anidadas entre los distintos partidos políticos, la convocatoria a elecciones en febrero de 1946 no incluyó a las municipalidades; situación que en Río Cuarto se prolongó hasta noviembre de 1951. Durante este período, tanto el oficialismo peronista como los partidos de la oposición concentraron sus esfuerzos proselitistas en las elecciones nacionales y provinciales, principalmente en las legislativas, puesto que eran las que les brindaban mayores posibilidades de acceso de poder. Cuando finalmente la ciudadanía local fuera convocada para elegir a sus autoridades locales, dadas las modificaciones introducidas por la nueva Ley Orgánica Municipal, no se produciría el esperado retorno a la autonomía municipal sino que, por el contrario, se acentuaría la tendencia a la concentración geográfica y funcional de lo político-administrativo; frente a lo cual los partidos deberían nuevamente adecuar sus estrategias tanto hacia su propio interior como de cara a las instancia de competencia electoral.; The federal intervention derived from the 1943 coup terminated the functions of mayors and deliberative councils in the province of Córdoba. Despite hopes nested between different political parties, holding elections in February 1946 did not include municipalities; Rio Cuarto situation lasted until November 1951. During this period, both the ruling Peronist as opposition parties focused their proselytizing efforts in national and provincial elections, mainly in the laws, since they were the who provided higher accessibility of power. When finally the local citizenry was convened to elect their local authorities, given the changes introduced by the new Municipal Organic Law, the expected return of municipal autonomy would not occur but, on the contrary, the tendency is accentuated the geographic concentration and functional politicaladministrative; against which the parties should again adapt their strategies both his inward and facing the instance of electoral competition.

La traducción como herramienta de investigación socio semiótica Montes, Maria de Los Angeles La incorporación de los modelos ternarios de signo a la semiótica abrió un campo nuevo de problemas de investigación. La recepción de los signos es uno de ellos. Pero la recepción importa actividades de interpretación y actividades de apropiación. Mientras las segundas son fácilmente observables porque se plasman en prácticas y discursos, las primeras son reticentes a la observación directa, se refugian en el mundo interior y se expresan en el mundo exterior casi exclusivamente a través de las segundas. ¿Cómo acceder, entonces, a las interpretaciones? En busca de la respuesta a esa pregunta hemos diseñado una herramienta técnica que se sirve de la traducción para hacer producir discursos lo más apegados posible a las interpretaciones, en el marco de entrevistas focalizadas. En esta comunicación pretendo exponer los fundamentos teóricos que permiten utilizar la traducción como técnica, tanto para reconstruir las interpretaciones de los informantes, como para inferir las operaciones y los procesos cognitivos que llevan a ellas. Lo haré analizando las potencialidades de las traducciones intersistémicas e intrasistémicas, y lo ilustraré con ejemplos tomados de una investigación empírica sobre la recepción del tango (tanto en su música como en su poesía) en la ciudad deCórdoba.

Reivindicaciones, discursos y conflicto: las corporaciones agrarias en el marco de la estructuración del 'consenso' neoliberal (1989-1991) Carini, Gabriel Fernando El presente artículo tiene como objetivo general indagar en los discursos y demandas de un conjunto significativo de las corporaciones del sector agropecuario en momentos previos a la configuración del nuevo régimen social de acumulación de la década de 1990. El presupuesto que guía el mismo es que esa coyuntura permitió, por un lado, canalizar un conjunto de reivindicaciones previas (históricas) de las corporaciones sobre el rol del Estado y, por el otro lado, cimentó los consensos iniciales que legitimaron el modelo económico emergente.

Crítica política del saber y diagnóstico del presente: Reflexiones epistemológicas y ontológico – políticas en torno a la discursividad foucaulteana Dalmau, Iván En el presente artículo se pretende indagar respecto de la densidad epistemológica y ontológico - política que encierra la propuesta foucaulteana de puesta en práctica de una crítica política del saber, tal como la misma se encuentra esbozada en las primeras clases del curso dictado en el Collège de France durante el ciclo lectivo 1978 - 79, bajo el título Naissance de la Biopolitique. Nuestra estrategia de abordaje de dicha problemática consistirá en la relectura de diversos fragmentos de la producción foucualteana previa al dictado de dicho curso, intentando entrever en qué medida la noción de crítica política del saber encierra y recupera críticamente parte del herramental constituido por el propio Foucault en los años precedentes.; The aim of this work is to analyze the epistemological and ontological-political complexity on Foucault’s discourse on political critique of knowledge that he presented during 1978-1979 while dictating the course “Naissance de la Biopolitique” in the Collège de France. To do this we are going to consider part of his work published before the dictation of the course above mentioned as a way to assess the influence of some of his “tools” on the notion of political criticism of knowledge.

La categoría lunfardo en el Diccionario del habla de los argentinos (2003) Tallatta, Cecilia Natalia En el marco de la política lingüística panhispánica difundida por la Real Academia Española (RAE), la Academia Argentina de Letras (AAL) publica en el año 2003 por la editorial Espasa Calpe el “Diccionario del habla de los argentinos” (DiHA). Cinco años después, en el año 2008, sale a la luz una segunda edición, corregida y aumentada, esta vez por la editorial Emecé. En el presente trabajo nos enfocamos en el “Estudio preliminar” que escribió Pedro Barcia, Presidente de la AAL, a la segunda edición de este diccionario con el objetivo de analizar la representación de la lengua que construye y que busca difundir en los hablantes. Nos enfocaremos en la categoría “lunfardo” y analizaremos la exclusión explícita que hace Barcia en el momento de definir lo que debe ser considerado un argentinismo y lo que no debe incluirse dentro de esta categoría.; In the field of the Pan-Hispanic language politics, spread by the Real Aca-demia Española (RAE), the Academia Argentina de Letras (AAL), with the Espasa Calpe Publishing House, edited the Diccionario del habla de los argentinos (DiHA) (Argen-tinian’s Speech Dictionary) in 2003. Five years later, in 2008, an improved and larger second edition was published by Emecé Publishing House. In this paper, we focus on the “Estudio preliminar” that Pedro Barcia, AAL President, wrote to the second edition of this dictionary. We study the social representations of the national speech that he builds and seeks to spread over the speakers. We focus on the “lunfardo”, in order to analyze the clear exclusion Barcia makes when defining what should be considered an “argentinismo” and what should not be included in this category.