Vínculos territoriales y experiencias de inseguridad en estados de confiabilidad incierta Isla, Alejandro Raul; Miguez, Daniel Pedro Em várias regiões da América Latina, experiências e percepções de insegurança tornaram-se um dos epicentros a partir dos quais se configuram representações do Estado, práticas sociais e formas específicas de relação social. Com base em dados produzidos por um survey e de materiais coletados por meio de pesquisa etnográfica, analisamos esses processos de configuração a partir da observação da dinâmica de interação que têm lugar em redes sociais territoriais em enclaves urbanos pobres da Argentina e as formas como órgãos públicos e episódios de vitimização nelas se inscrevem.; In several regions of Latin America, experiences and perceptions of insecurity have become one of the epicentres for forming representations of the State, social habits and specific forms of the social relation. Based on data produced by a survey and materials gathered through ethnographic research, Territorial Connections and Experiences of Insecurity in States of Uncertain Reliability analyze these processes of configuration in view of the interactive dynamic found in territorial social networks in poor urban areas of Argentina and how the public authorities and episodes of victimization become involved.

La Sofía gnóstica y la concepción de la mística entre los neoplatónicos Garcia Bazan, Francisco El artículo consta de dos partes. La primera (A) se refiere al significado de la figura de Sofía en la tradición gnóstica, sus raíces en las exégesis bíblicas de la Sabiduría, su simbolismo esotérico y su recepción dentro de las diferentes corrientes y documentos gnósticos indirectos y directos. La proyección del símbolo concluye con su vinculación al núcleo de la divinidad en sí misma de naturaleza oculta a la que se accede por la vía del amor comunitario. La segunda parte (B) en estrecha relación con la primera, aborda el tema en relación con la experiencia mística común a neoplatónicos y gnósticos. La fenomenología de la religión considera a la mística como «la experiencia fruitiva de un absoluto». Dentro del movimiento neoplatónico se confirma lo acertado de la caracterización desde una triple perspectiva: a) neoplatonismo contemplativo (Plotino), b) los gnósticos arribados a la escuela de Plotino en Roma (´Apocalipsis del Allógenes´ - NHC XL, 3), c), el neoplatonismo hierático de influencia hermético-gnóstica (Jámblico de Calcis, ´Sobre los misterios egipcios´); The paper covers two parts: The first one (A) deals with the significance of the Sophia’s figure within Gnostic Tradition, its roots in the biblical exegesis of Wisdom, its esoteric symbolism and its reception in regards to the different Gnostic currents and documents, either direct or non-directs. The projection of the symbol concludes with its link to the nucleus of the divinity’s hidden nature itself, accessible through the way of the communitarian love. The second part (B), in close relationship with the first one, tackles the mytical experience’s issue in between the Neoplatonics and the Gnostics. The phenomenology of religion considers the mystical experience as “the fruitful experience of an absolute”. According the Neoplatonic movement, it’s confirmed this rightful assertion from a triple perspective: a) the contemplative Neoplatonism (Plotinus); b) the Gnostics arrive to Plotinus’ school at Rome (Apocallypse of Allógenes –NHC XI, 3); c) the hieratic Neoplatonism gifted by Hermetic and Gnostic influences (Iamblichus of Chalcis, On the Egyptian Mysteries).

“La batalla de Mbororé”: configuraciones narrativas de la identidad y la diferencia en un relato ejemplar en Misiones, Argentina; “La batalla de Mbororé”: narratives configurations of identity and difference in an exemplary tale in Misiones, Argentina Fernández, Froilán El presente artículo explora las fijaciones y los desplazamientos en un relato ejemplar emblemático de la memoria cultural misionera, La batalla de Mbororé, enfatizando las ambivalencias y aporías en las configuraciones de una identidad narrativa que inscribe los orígenes del territorio misionero en la genealogía de la nación argentina. Analizamos las estrategias discursivas que en el relato propician un imaginario de pertenencias y rechazos que pretende eludir las fricciones culturales y políticas de un semiosfera mestiza, turbulenta y dinámica.; This article explores the fixations and movements in an exemplary tale emblematic of the cultural memory in Misiones, Argentina. We emphasize the ambivalences and aporias of this story in the configurations of a narrative identity that connected the origins of Misiones with the genealogy of Argentina. We analyze the rhetorical strategies that in this story created a “homogeneous identity” of this dynamic and mixed semiosphere.

Revisión del género PerezIa (compositae) Katinas, Liliana El género Perezia Lag. (Compositae) se compone de 30 especies de hierbas perennes distribuidas principalmente en la región andino-patagónica, desde Colombia hasta el sur de Argentina y Chile, con algunas especies en el este de Brasil y de la Argentina, Paraguay y Uruguay. Sus corolas bilabiadas, anteras sagitadas, estilos truncados con una coronita apical de pelos colectores y su estructura polínica ubican al género en la tribu Nassauvieae, subfamilia Mutisioideae. Se propone en este trabajo: a) la rehabilitación de Perezia atacamensis, P. burkartii y P. capito; b) la transferencia de P. ciliosa var. dentata a la categoría de especie [P. dentata (Cabrera) comb. nov.]; c) la inclusión de Perezia catharinensis Cabrera, P. eryngioides (Cabrera) Crisci y P. volcanensis Cabrera, descritas o transferidas posteriormente a la primer revisión del género en 1969; d) la eliminación de subespecies en P. lactucoides; e) el establecimiento de la sinonimia entre P. pinnatifida, P. pygmaea y P. coerulescens; f) el establecimiento de la sinonimia entre P. pungens, P. ciliaris, P. mandonii, P. purpurata, P. carduncelloides y P. sublyrata; g) la rehabilitación de Perezia recurvata subsp. recurvata, subsp. beckii y subsp. triceps. Se designaron dos lectotipos y cinco neotipos, y se excluyeron 86 nombres del género.; Revision of the genus Perezia (Compositae). The genus Perezia Lag. (Compositae), with 30 species, is distributed in the Andean-Patagonian region from Colombia to southern Argentina and Chile, and in eastern Brasil and Argentina, Paraguay and Uruguay. It belongs to the tribe Nassauvieae, subfamily Mutisioideae by its bilabiate corollas, caudate anthers, truncate style branches with a crown of collector hairs, and a particular pollen structure. It is proposed in this paper: a) the rehabilitation of Perezia atacamensis, P. burkartii, and P. capito; b) the change of P. ciliosa var. dentata to the species category [P. dentata (Cabrera) comb. nov.]; c) the inclusion of Perezia catharinensis Cabrera, P. eryngioides (Cabrera) Crisci, and P. volcanensis Cabrera described or transferred after the first revision of the genus in 1969; d) the non-recognition of subspecies in P. lactucoides; e) the establishment of the synonymy among P. pinnatifida, P. pygmaea, and P. coerulescens; f) the establishment of the synonymy among P. pungens, P. ciliaris, P. mandonii, P. purpurata, P. carduncelloides, and P. sublyrata; g) the rehabilitation of Perezia recurvata subsp. recurvata, subsp. beckii, and subsp. triceps. Two lectotypes and fve neotypes are designated, and 86 names are excluded from the genus.

Gas Flow in a Channel Semiobstructed by a Porous Media Dalponte, Diego David; Silin, Nicolas; Clausse, Alejandro An experimental study of a gas flow in a narrow channel partially obstructed by a regular array of wires is presented. The velocity profile along the channel was measured by means of a hot-wire anemometer, inside and outside the obstructed region. Flow instabilities were found in the free zone adjacent to the porous region, which were characterized by the standard deviation and the power spectrum of the signal of the anemometer. The experimental profiles were compared with numerical simulations using a two-dimensional Lattice Boltzmann model.

Niños y niñas en el espacio urbano: La provincia de Buenos Aires entre fines del siglo XIX y principios del XX de Paz Trueba, Yolanda Edith El crecimiento poblacional producto de la inmigración masiva y la consecuente urbanización acelerada de ciudades y pueblos por los que atravesó Argentina en las décadas finales del siglo XIX, se contaron entre los avances más destacados del momento. En este contexto, la pobreza adquirió un sentido de peligrosidad que se hizo visible en la figura de vagabundos, mendigos y especialmente para nuestro interés, de los niños que deambulaban por las calles mendigando o desempeñándose en trabajos que los mantenían largas horas fuera del hogar, cuando tenían uno. El objetivo de este trabajo es analizar, en el contexto de modernización y desarrollo de la urbanización por la que atravesaron el centro y sur de la provincia de Buenos Aires, la recepción que la sociedad local hacía de la presencia de los niños en la vía pública, y si existían algunas diferencias en relación al género. Proponemos un primer acercamiento que retome los dichos de la prensa local al respecto, para contrastarlos luego en una segunda instancia, con documentos de las Defensorías de Menores y la policía, de manera de problematizar esa percepción.

Objeción de conciencia sin precedentes Legarre, Santiago La presente nota analiza un caso de objeción de conciencia a la luz de la doctrina de la obligatoriedad atenuada del precedente desarrollada por la Corte Suprema de Justicia de la Nación. Fundamentalmente, y en línea con la investigación encarada por el suscripto, se analizan problemas prácticos de la falta de mayoría en un caso de la Corte Suprema.

Justification Logic as a foundation for certifying mobile computation Bonelli, Eduardo Augusto; Feller, Federico We explore an intuitionistic fragment of Artëmov's . Justification Logic as a type system for a programming language for . mobile units. Such units consist of both a code and a certificate component. Our language, the . Certifying Mobile Calculus, caters for code and certificate development in a unified theory. In the same way that mobile code is constructed out of code components and extant type systems track local resource usage to ensure the mobile nature of these components, our system . additionally ensures correct . certificate construction out of certificate components. We present proofs of type safety and strong normalization for a run-time system based on an abstract machine.

La abstracción en la teoría del conocimiento de Hegel Ferreiro, Hector Alberto En la filosofía de Aristóteles y en la filosofía escolástica de cuño aristotélico, la abstracción constituía un acto fundamental del proceso cognitivo: marcaba el salto o ascenso de la sensibilidad a la inteligibilidad, del conocimiento del individuo al conocimiento de su esencia. En la teoría del conocimiento de Hegel, por el contrario, el concepto abstracto o, como Hegel prefiere llamarlo, la “representación abstracta” o “representación universal” es tan sólo un momento intermedio en el proceso fluído que va del conocimiento del objeto como algo sensible -en la forma de la intuición y la subforma de la imagen- al conocimiento de su naturaleza intrínseca -en la forma del pensar. Sobre la base, por un lado, de los escasos textos en los que Hegel se ocupa expresamente del tema, y, por el otro, de la contextualización de estos textos en un análisis general de la filosofía del espíritu subjetivo teórico, el presente trabajo busca reconstruir las tesis fundamentales de Hegel sobre la abstracción y esclarecer con ello el sentido y función que la misma tiene en su teoría del conocimiento.; n both Aristotelian philosophy and the scholastic philosophy that bears its stamp, the concept of abstraction constitutes a fundamental act in the cognitive process; it signaled the leap or ascent from the realm of the senses to the realm of intellection, from knowledge of the individual to knowledge of his essence. By way of contrast, in Hegel's theory of knowledge, the abstract concept -or, as Hegel himself preferred to call it, “abstract representation” or “universal representation”- is nothing but an intermediate moment in the fluid process of going from knowing the object as something given to the senses -in the form of intuition and the subform of image- to knowing its intrinsic nature -in the form of thought. Based on the scant writings by Hegel wherein he expressly addresses the matter, and by subsequently placing these texts into the broader context of an analysis of Hegel's philosophy of theoretical subjective spirit, this paper attempts to reconstruct Hegel's most significant ideas on abstraction. Hopefully, this will serve to clarify both the meaning and the role of that notion in Hegelian theory of knowledge.

Rupturas y continuidades en los modos de hacerse joven Capriati, Alejandro Jose ¿Qué hay de novedoso en las prácticas culturales y en las experiencias nocturnas de las generaciones más jóvenes? ¿Las prácticas culturales y los espacios de sociabilidad juveniles constituyen experiencias facilitadoras de procesos reflexivos, “de ampliación de conciencia”, acerca de las propias condiciones y perspectivas de existencia? ¿En qué medida estas prácticas y espacios juveniles tienen la potencialidad de modificar la reproducción de desigualdades sociales?

Antitumor Protection by NGcGM3/VSSP Vaccine Against Transfected B16 Mouse Melanona Cells Overexpressing N-Glycolylated gangliosides Segatori, Valeria Inés; Otero, Laura; Fernandez, Luis Enrique; Gomez, Daniel Eduardo; Alonso, Daniel Fernando; Gabri, Mariano Rolando Background: Cancer vaccines are designed to modulate immunological responses against tumor cells through the presentation of tumor antigens. Materials and Methods: The mouse mRNA of the cytidine monophospho-N-acetylneuraminic acid hydroxylase (Cmah) gene, the enzyme that catalyzes the synthesis of N-glycolylneuraminic acid (NGc), was cloned and transfected into the B16 melanoma cell line. Transfected cells (B16-H) were characterized and used as an NGcGM3-positive primary tumor model for the evaluation of the therapeutic activity of the NGcGM3/VSSP vaccine. Results: The presence of NGcGM3 in B16-H cells promoted proliferation and adhesion in vitro, but resulted in reduced tumorigenicity in vivo. However, B16-H cells developed growing tumors in mice where NGcGM3/VSSP vaccination induced a therapeutic antitumor activity. NGcGM3/VSSP was ineffective in mice inoculated with parental B16 or B16-H cells that had lost NGcGM3 expression. Conclusion: The presence of NGcGM3 in tumor cells is critical for the antitumor activity of NGcGM3/VSSP vaccine.

Expression of heme oxygenase-1 in non small cell lung cancer (NSCLC) and its correlation with clinical data Degese, María Sol; Mendizábal, Javier Enrique; Gandini, Norberto Ariel; Gutkind, J. Silvio; Molinolo, Alfredo; Hewitt, Stephen M.; Curino, Alejandro Carlos; Coso, Omar Adrian; Facchinetti, Maria Marta While changes in heme oxygenase (HO-1) in lung cancer have already been reported, conflicting results were obtained for enzyme expression in human lung cancer specimens. Therefore, the aim of this work was to study HO-1 expression in a large collection of human lung cancer samples. For this purpose, we analyzed the expression of HO-1 in an organized tissue microarray (TMA) and investigated its correlation with clinicopathological data. Ninety-six percent of tumor samples were positive for HO-1, and the expression of HO-1 was significantly higher in cancerous than in non-cancerous tissues. Importantly, HO-1 expression correlated with advanced stages and lymph node involvement. Additionally, quantitative RT-PCR in 18 pairs of human lung carcinomas and their adjacent non-malignant tissues was performed. Our results demonstrate that HO-1 protein is upregulated in epithelial malignant cells in NSCLC and its expression is associated with higher stages of the disease. Additionally, different subcellular localization is observed between tumor and adjacent non-malignant tissues.

Physico-Chemical and Mechanical Properties of Apple Disks Subjected to Osmotic Dehydration and Different Drying Methods Sosa, Natalia; Salvatori, Daniela Marisol; Schebor, Carolina Claudia The effect of sucrose infusion (SI) pretreatment and dehydration methods (freeze and air drying) on physical and textural properties of apple disks were analyzed. Dried samples were humidified between 11% and 43% relative humidity (RH) at 20 °C. Control samples (air- and freeze-dried) behaved similarly regarding water sorption and glass transition temperature. SI process caused important changes in the water sorption behavior of air-dried samples. Nuclear magnetic resonance relaxation times values (T 2) for freeze-dried apples were higher than those for air-dried samples. Samples subjected to previous SI always presented lower T 2 values because they had lower water contents. The dehydration method also affected the mechanic behavior. Air-dried samples exhibited higher F max values during puncture assay than those obtained for freeze-dried samples. SI samples showed higher F max values for both drying methods. The crust formed during air drying generated crispier materials along the whole RH range, while freeze-dried matrices were more deformable with the increase in RH. SI pretreatment also allowed diminishing browning development. The results obtained are useful in the choice of processing technologies of organoleptically acceptable dehydrated fruits for direct consumption or for their incorporation into compound foods.

Application of the multi-standard methodology for calculating 1H NMR chemical shifts Sarotti, Ariel Marcelo; Pellegrinet, Silvina Carla Gauge including atomic orbitals (GIAO)1H NMR chemical shift calculations have been performed for 66 organic compounds at 72 di fferent levels of theory using the multi-standard approach (MSTD) previously developed for 13C NMR. This straightforward computational technique involves the combination of methanol and benzene as standards. The studied methodology has been shown to predict 1H NMR chemical shifts efficiently at different levels of theory.

Sunflower-Soybean Intercrop. Productivity under different water conditions and sowing managements Andrade, José Francisco; Cerrudo, Anibal Alejandro; Rizzalli, Roberto Héctor; Monzon, Juan Pablo The sunflower (Helianthus annus L.)–soybean [Glycine max (L.) Merr.] intercrop has emerged as an option that increases land productivity in the southern Pampas of Argentina, compared with sole crops, because of complementary use of resources between species. A common management practice for this intercrop consists of delay soybean sowing, although delayed planting reduces the capacity of soybean to capture resources. Simultaneous sowing could improve total intercrop productivity because of an increase in soybean grain yield with no or little detrimental effects on sunflower grain yield. The objectives of this study were to analyze the response of the sunflower–soybean intercrop and of their component species under different sowing management (i.e., relay or simultaneous sowing) and water availability conditions. Three experiments were conducted at Balcarce, Argentina. Four cropping systems were evaluated: (i) sunflower–soybean intercrop with simultaneous sowing management (I00), (ii) sunflower– soybean intercrop with 30 d of delay between sunflower and soybean sowing (I30), (iii) sunflower sole crop (SUN), and (iv) soybean sole crop (SOY). Sunflower–soybean intercrop grain yield tend to be higher than that for sole crops of the component species. This yield advantage for intercrop increased with water availability and was associated with an increase in intercropped soybean productivity. Intercrop sowing management had no effect on total intercrop grain yield. However, simultaneous sowing increased soybean contribution to intercrop yield. Finally, our results indicate that agronomic practices that promote.

Evaluation of pyrethroids toxicity in a laboratory strain and a field population of Rachiplusia nu (Lepidoptera: Noctuidae) using two bioassay techniques; Evaluación de la toxicidad de piretroides en una cepa de laboratorio y una población de campo de Rachiplusia nu (Lepidoptera: Noctuidae) usando dos métodos de bioensayo Russo, Romina; Gamundi, Juan C; Alzogaray, Raúl Adolfo Soybean is the most important crop in Argentina and Rachiplusia nu (Gueneé) (Lepidoptera: Noctuidae) is one of its main pests. In this study, the toxicity of five pyrethroids applied topically and by exposure to films on filter paper was evaluated on third instar larvae from a laboratory strain and a field population of R. nu. Four cyanopyrethroids and one noncyanopyrethroid (permethrin) were tested. All cyanopyrethroids showed the same order of increasing toxicity, regardless of the form of application and origin of the larvae: cypermethrin < lambda-cyhalothrin < deltamethrin < beta-cyfluthrin. Knock down Dose 50% and Knock down Time 50% values increased as a function of the solubility of cyanopyrethroids in water. Permethrin showed a different behavior: it was the most toxic insecticide for the laboratory strain when applied topically, but the least toxic when larvae were exposed to filter papers. In general, the pyrethroids were more toxic for laboratory larvae than for the field ones. After calculating Resistance Factor (RF) values, low-moderate resistance to permethrin, cypermethrin and lambda-cyhalothrin was observed in the experiments with topical application. However, exposure to films on filter papers failed to detect resistance. There was not correlation between the RF values obtained by both methods. These results suggest that the population of studied here has low-moderate resistance to some pyrethroids, and that topical application is a more appropriate method for quantifying resistance than exposure to insecticide films on filter paper.; La soja es el cultivo más importante en la República Argentina y Rachiplusia nu (Gueneé) (Lepidoptera: Noctuidae), una de sus principales plagas. En este estudio se evaluó la toxicidad de cuatro cianopiretroides y un no-cianopiretroide, aplicados en forma tópica o por exposición a filmes sobre papeles de filtro, en ninfas del tercer estadio de una cepa de laboratorio y una población de campo de R. nu. Todos los cianopiretroides mostraron el mismo orden de toxicidad creciente, independientemente de la forma de aplicación y del origen de las larvas: cipermetrina < ?-cihalotrina < deltametrina < ß-ciflutrina. Los valores de Dosis de Volteo para el 50% (DV50) y de Tiempo de Volteo para el 50% (TV50) aumentaron en función de la solubilidad de los cianopiretroides en agua. El no-cianopiretroide permetrina mostró un comportamiento diferente: fue el insecticida más tóxico para la cepa de laboratorio cuando se hizo una aplicación tópica, pero el menos tóxico cuando las larvas fueron expuestas a filmes sobre papeles de filtro. En general, todos los piretroides fueron más tóxicos para las larvas criadas en laboratorio que para las provenientes del campo. La estimación de los valores de Factor de Resistencia (FR) permitió establecer que la población de campo presentaba resistencia moderada o baja a permetrina, cipermetrina y ?-cihalotrina, cuando los insecticidas fueron aplicados en forma tópica. Sin embargo, no se detectó resistencia cuando se realizó la exposición en papeles de filtro tratados. No hubo correlación entre los valores de FR obtenidos por ambos métodos. Estos resultados sugieren que la población de campo de R. nu estudiada, presentaba resistencia moderada a algunos piretroides, y que la aplicación tópica es un método más apropiado que la exposición a filmes sobre papeles de filtro para cuantificar la resistencia.

Polyvinyl alcohol-pectin cryogel films for controlled release of enrofloxacin Martinez, Nelida Yanina; Piñuel, Maria Lucrecia; Castro, Guillermo Raul; Breccia, Javier Dario The release of enrofloxacin entrapped in polyvinyl alcohol (PVA) cryogel at pH 5.5 showed a first-order kinetic, releasing 69.7% of the antibiotic after 4.5 h at 37 °C. In order to slow down the fluoroquinolone release rate, high-methoxylated pectin was added into the cryogel (PVA-P). A film containing 1.0% (w/v) HM pectin and 5.0 μg/ml enrofloxacin released only 3.7% of the antibiotic after 4.5 h. Since the FTIR spectrum showed that most of the interactions between PVA-P matrix and enrofloxacin were due to polar groups (carboxylate and amine), a two-layer film system was designed to modulate the releasing rate of the drug. The top film equilibrated with 0.75 or 1.5 M NaCl release up to 41.9% and 89.0% of the enrofloxacin in 4 h, respectively. The release rate of enrofloxacin was found dependent on NaCl concentration in the upper gel layer. The two-layer cryogel system showed attractive features for transcutaneous antibiotic delivery.

Geographical and botanical classification of honeys and apicultural products by chemometric methods. A review Camiña, José Manuel; Pellerano, Roberto Gerardo; Marchevsky, Eduardo Jorge Evaluations of adulteration, geographical and botanical origin of bee-products are matters of great interest worldwide. These trends are principally related to the international market of food commodities. The chemometric tools appear as new analytical complements which, in recent years, were successfully used to define the geographical and botanical origin of food raw materials or to detect possible adulterations. The classification can be possible using different analysis criteria, such as minor and trace elements, as well as sugars and other items by the chemometric analysis. This review contains a survey of the current multivariate methods published between January 1999 and February 2011, used for the classification and authentication of honey and other bee-products. References are ordered in a way to allow easy reading and further search.

"Semillas en tierras estériles". La recepción del APRA en la Argentina de mediados de la década de los treinta. Sessa, Leandro Si bien los orígenes de la Alianza Popular Revolucionaria Americana (APRA) están relacionados con las repercusiones continentales del movimiento reformista universitario, en la década de los veinte, la presencia del aprismo en la Argentina tuvo ecos más allá de esos antecedentes. Durante la década de los treinta, militantes interesados en las ideas antiimperialistas procuraron aclimatar el aprismo a la realidad Argentina. A través del análisis de los artículos escritos en la revista Claridad por Alberto Faleroni, principal referente del “aprismo argentino”, y de la reconstrucción de la experiencia del Partido Aprista Argentino (PAA), procuramos dar cuenta de las posibilidades y dificultades en torno de los intentos de construir una propuesta inspirada en el APRA. Este análisis nos permite indagar en el recorrido de ciertas ideas vinculadas al antiimperialismo, el nacionalismo y la perspectiva continental, que circulaban en redes políticas e intelectuales cercanas al socialismo.; Even though the origins of the Popular Revolutionary American Alliance [APRA] are related to the continental impact of University Reform movement, in the 1920's the APRA's presence in Argentina had echoes beyond these precedents. During the thirties, militants interested in anti-imperialist ideas tried to adapt aprism to the argentine context. Through the analysis of Claridad magazine articles written by Alberto Faleroni, the main reference point of "Argentinean aprism", and the reconstruction of the Partido Aprista Argentino [PAA] experience, we try to explore the possibilities and difficulties of the attempts to build an APRA-inspired project. This analysis allows us to investigate the itineraries of certain ideas linked to anti-imperialism, nationalism and continental perspective, which circulated in political and intellectual networks close to socialism.

Helechos epífitos de Alsophila setosa (Cyatheaceae, Pteridophyta) en la Provincia de Misiones, Argentina; Epiphyte ferns on Alsophila setosa (Cyatheaceae, Pteridophyta) from Misiones province, Argentina Marquez, Gonzalo Javier; Yañez, Agustina Los cáudices de los helechos arborescentes presentan condiciones particulares que favorecen el establecimiento de epífitas. En este trabajo se estudiaron los helechos que crecen sobre Alsophila setosa (Cyatheaceae, Pteridophyta) en la provincia de Misiones. Se encontraron 21 especies, que se agruparon en 10 géneros y 5 familias. La familia más diversa fue Polypodiaceae, con 8 especies, y los géneros mejor representados fueron Asplenium (6) y Pecluma (4). Se presenta una clave para la identificación de los taxa involucrados. La gran cantidad de especies encontradas refleja la importancia de Alsophila setosa como reservorio de diversidad biológica en el bosque atlántico.; Trunks of tree ferns offer especially distinctive substrates to support epiphytes. In this paper, ferns that grow on Alsophila setosa Kaulf. from Misiones were studied. A total of 21 species, from 10 genera and 5 families, were recorded. Polypodiaceae (8) had greater specific diversity. Richest genera were Asplenium (6) and Pecluma (4). A key is presented to identify the taxa involved. The high epiphytic diversity found suggests that Alsophila setosa plays an important role as a biodiversity reservoir in the Atlantic forest.