Patrones tonales, generalización por clases, y representación de la tonalidad: un modelo de cognición tonal dependiente del contexto y del aprendizaje; Tonal patterns, class generalization, and tonality representation: a model of tonal cognition based on context and learning Anta, Juan Fernando En el presente artículo se revisan dos modelos de cognición tonal ampliamente difundidos en la literatura psicomusicológica: el de la acumulación de clases de eventos y el de los vectores de clases de intervalos. Se argumenta luego que tales modelos presentan aspectos críticos sustanciales, particularmente en lo que se refiere a cómo proponen que se infiere y se representa la tonalidad. El mayor problema estribaría en que asumen que la tonalidad es representada en términos de clases de elementos musicales, clases de eventos o de intervalos, respectivamente; este es un aspecto problemático porque dichas clases de elementos pueden no tener realidad cognitiva en la mente musical de los oyentes. Atendiendo a esto, se formula aquí un nuevo modelo de cognición tonal, fundado no en la idea de ?clases de elementos? sino en la idea de una inferencia y generalización progresiva del sentido tonal. Según el modelo propuesto, la tonalidad sería inferida a partir de los elementos contenidos en los contextos musicales considerados, y luego representada en términos de áreas tonalmente activas cuyo tamaño y perfil interno de activación dependen tanto del contexto musical de referencia como del nivel de formación musical del oyente.; In this paper, two well-known models of tonal cognition are reviewed: the distributional model and the interval classes’ vectors (or functional) model. It is argued that these models have some intrinsic problems, particularly about how they propose that tonality is induced and mentally represented. The main problem would be that both of them assume that tonality is represented in terms of classes of musical elements, classes of pitches or classes of pitch intervals, respectively; this is a problem because these classes of elements may not have cognitive reality in listeners’ musical mind. Hence, a model of tonal cognition is proposed that is not based on the idea of ‘class of elements’, but on the idea of inference and progressive generalization of tonal sense. According to this model, tonality would be inferred from the actual elements contained in the musical context being perceived and, finally, it would be represented in terms of tonally active areas whose size and internal profile depend on both musical context and listener’s musical training.

Nuevos registros de Proconiini (Hemiptera: Cicadellidae) de la Argentina; New records of Proconiini (Hemiptera: Cicadellidae) from Argentina Dellapé, Gimena; Paradell, Susana Liria Acrogonia citrina Marucci & Cavichioli, Molomea confluens (Melichar), Tretogonia dentalis Emmrich, and Propetes schmidti Melichar are recorded for the first time from Argentina, being the first mention of the genus Propetes Walker in the country. Diagnosis, geographical distribution, and aspects of the biology or phytosanitary importance for each species are provided. In addition, geographical distribution in Argentina of another 16 species of the tribe Proconiini is here included.; Acrogonia citrina Marucci & Cavichioli, Molomea confluens (Melichar), Tretogonia dentalis Emmrich y Propetes schmidti Melichar, son registradas por primera vez en la Argentina. Esta es la primera mención del género Propetes Walker para el país. Para cada especie se brinda una diagnosis, su distribución geográfica y aspectos de su biología o importancia fitosanitaria. Adicionalmente se amplía la distribución en la Argentina de otras 16 especies de la tribu Proconiini.

Boundaries in the Moyal plane Falomir, Horacio Alberto; Franchino Viñas, Sebastián Alberto; González Pisani, Pablo Andrés; Vega, Federico Gaspar We study the oscillations of a scalar field on a noncommutative disc implementing the boundary as the limit case of an interaction with an appropriately chosen confining background. The space of quantum fluctuations of the field is finite dimensional and displays the rotational and parity symmetry of the disc. We perform a numerical evaluation of the (finite) Casimir energy and obtain similar results as for the fuzzy sphere and torus.

Estrategias en la elevación del agua en la Pampa Chivilcoyana: La Noria de “San Bernardo”; Strategies in water lift in Pampa Chivilcoyana: La Noria of “San Bernardo” Caggiano, Maria Amanda; Dubarbier, Virginia Este trabajo constituye un aporte al rescate del patrimonio rural del partido de Chivilcoy (Argentina). A través del relevamiento de campo efectuado en la estancia “San Bernardo”, de las investigaciones arqueológicas emprendidas y del análisis de documentos históricos (mensuras, inventarios y sucesiones) vinculados a esas tierras, ofrecemos un acercamiento al estudio de los mecanismos de obtención de agua del siglo XIX. Esta investigación la iniciamos a partir del hallazgo de elementos deteriorados que formaron parte de una noria de tracción a sangre, localizados en el casco de la centenaria estancia que perteneció, hacia la segunda mitad del siglo XIX, al Dr. José Benjamín Gorostiaga. El objetivo de esta indagación se centró en reseñar los instrumentos relacionados con la extracción y almacenamiento de agua y dilucidar el funcionamiento de la noria, testimonios de una pretérita tecnología hidráulica.; This paper constitutes a contribution to rescue the rural heritage of the Chivilcoy district (Argentina). By means of the field survey made in “San Bernardo” ranch, the archaeological research undertaken and the analysis of historical documents related to these fields (measurements, inventories and successions), we present an approach to the study of the mechanisms for water withdrawal during the 19th Century. This investigation started with the finding of deteriorated elements which form part of the animal-drawn waterwheel, which were placed in the farmhouse and the surrounding areas of the centenary ranch, which belonged to Dr. José Benjamín Gorostiaga during the second half of the 19th Century. The purpose of this investigation was focused on the description of the instruments related to the extraction and storage of water, as well as on elucidating the functioning of the waterwheel; all these instruments are testimonies of an ancient hydraulic technology.; Este trabalho constitui uma colaboração ao resgate do patrimonio rural do partido de Chivilcoy (Argentina). Através do relevamento de campo efetuado na fazenda “San Bernardo”, das investigações arqueológicas lançadas e da análise dos documentos históricos (medições, inventarios, sucessões) ligados à destas terras, oferecemos uma aproximação ao estudo dos mecanismos de obtenção de água do século XIX. Esta investigação a iniciámos a partir do achado de elementos deteriorados que fizeram parte de uma roda de água de tração para sangue, localizados no capacete de uma fazenda centenária que pertenceu, até a segunda metade do século XIX, ao Dr. José Benjamín Gorostiaga. O objetivo desta pesquisa centrou-se em de resenhar os instrumentos relacionados com a captação e armazenagem de agua e elucidar o funcionamento da nora, testemunho de uma pretérita tecnología hidráulica.

Digital pulse processing in Mössbauer spectroscopy Veiga, Alejandro Luis; Grunfeld, C. M. In this work we present some advances towards full digitization of the detection subsystem of a Mössbauer transmission spectrometer. We show how, using adequate instrumentation, preamplifier output of a proportional counter can be digitized with no deterioration in spectrum quality, avoiding the need of a shaping amplifier. A pipelined architecture is proposed for a digital processor, which constitutes a versatile platform for the development of pulse processing techniques. Requirements for minimization of the analog processing are considered and experimental results are presented.

Exact predictions from the Edwards ensemble versus realistic simulations of tapped narrow two-dimensional granular columns Irastorza, Ramiro Miguel; Carlevaro, Carlos Manuel; Pugnaloni, Luis Ariel We simulate, via a discrete element method, the tapping of a narrow column of disks under gravity. For frictionless disks, this system has a simple analytical expression for the density of states in the Edwards volume ensemble. We compare the predictions of the ensemble at constant compactivity against the results for the steady states obtained in the simulations. We show that the steady states cannot be properly described since the microstates sampled are not in correspondence with the predicted distributions, suggesting that the postulates of flat measure and ergodicity are, either or both, invalid for this simple realization of a static granular system. However, we show that certain qualitative features of the volume fluctuations which are difficult to predict from simple arguments are captured by the theory.

Discrete second order constrained Lagrangian systems: first results Borda, Nicolás; Fernández, Javier; Grillo, Sergio Daniel We briefly review the notion of second order constrained (continuous) system (SOCS) and then propose a discrete time counterpart of it, which we naturally call discrete second order constrained system (DSOCS). To illustrate and test numerically our model, we construct certain integrators that simulate the evolution of two mechanical systems: a particle moving in the plane with prescribed signed curvature, and the inertia wheel pendulum with a Lyapunov constraint. In addition, we prove a local existence and uniqueness result for trajectories of DSOCSs. As a first comparison of the underlying geometric structures, we study the symplectic behavior of both SOCSs and DSOCSs.

Insects found on Araujia species (Apocynaceae, Asclepiadoideae) in Argentina; Insectos hallados en especies de Araujia (Apocynaceae, Asclepiadoideae) en Argentina Carpintero, Diego Leonardo; Testoni, Daniel The results of a survey of the natural enemies of moth plant or “tasi”, species of Araujia (Apocynaceae, Asclepiadoideae), present in Argentina are shown in this paper. 57 species of insects were recorded of which 17 are cited as natural enemies of these species for the first time. Their specificity was determined and their potential use as biological control agents for Araujia hortorum Fourn. was hypothesized. Pseudosphex noverca Schaus (Lepidoptera, Arctiidae), is recorded for the first time in the Buenos Aires province, Argentina.; Los resultados de un estudio de los enemigos naturales de las "planta polilla" o "tasi", especies del género Araujia (Apocynaceae, Asclepiadoideae), que se encontraron en Argentina se presentan en este documento. Se registraron 57 especies de insectos, 17 de las cuales son citadas como enemigos naturales de estas plantas por primera vez. Se determinó su especificidad y se planteó la hipótesis de su uso potencial como agentes de control biológico para Araujia hortorum Fourn. La especie Pseudosphex noverca Schaus, (Lepidoptera, Arctiidae), se cita por primera vez para la provincia de Buenos Aires, Argentina.

Comparative dissolution studies of albendazole oral suspensions for veterinary use González Vidal, Noelia Luján; Starkloff, Walter Javier; Bentancor, Silvia; Castro, Silvina Gabriela; Suárez, Gonzalo Pablo; Palma, Santiago Daniel Helminth infections are a major health problem mainly in developing countries, and the evidence of emerging resistance to all the major antihelminthics has been recognized in the field of animal husbandry. Albendazole (ABZ) is the most effective broad-spectrum antihelminthic agent. The biggest problem with this drug is its low aqueous solubility, which leads to an erratic availability and great intraindividual variation in the levels reached in different tissues. As with other poorly soluble compounds, the dissolution rate is likely to be contingent on the formulation and may lead to differences in performance among different products available in the market. In previous studies, drastic pharmacokinetic differences were observed among ABZ formulations (oral suspensions) in the Uruguayan market. These samples were evaluated in vitro in terms of ABZ content and dissolution profiles, as well as the effect of increasing agitation speeds on the dissolution rate. The in vitro dissolution rate of formulation A was seriously affected by the increase in agitation speed, and in the case of formulation B, it did not fulfill both essential quality requirements (drug content and dissolution profile). Further studies may be carried out to correlate the suspension quality with its therapeutic effectiveness.

Plant heat shock protein 90 as carrier-adjuvant for immunization against a reporter antigen Corigliano, Mariana Georgina; Fenoy, Ignacio Martín; Sander, Valeria Analía; Maglioco, Andrea Florencia; Goldman, Alejandra; Clemente, Marina Here, we evaluated the modulation of the immune response induced by Hsp90 of Nicotiana benthami-ana (NbHsp90.3) against the Maltose Binding Protein (MBP) as a reporter antigen. Equimolar quantitiesof recombinant proteins were administered in mice as follows: MBP alone (MBP group), a mixture ofMBP and rNbHsp90.3 (MBP + rNbHsp90.3 group) and the fusion of MBP to rNbHsp90.3 (MBP-rNbHsp90.3group). The covalent linkage between NbHsp90.3 and MBP to bring a fusion protein was essential toinduce the strong specific antibody response with predominance of IgG2a. Eighty-four days after the firstimmunization, splenocyte proliferation from MBP-rNbHsp90.3-immunized mice was consistently higherthan that from MBP and MBP + rNbHsp90.3 groups. In addition, splenocytes from MBP-rNbHsp90.3 immu-nized mice produced higher levels of IFN- than controls. Finally, both formulations with rNbHsp90.3significantly enhanced the MHC class I expression levels, but only rNbHsp90.3 covalent bound to MBPinduced a specific cellular immune response against MBP measured as increased percentage of CD8+Tcells. Taken together, these results suggest that plant HSP90s could be incorporated as adjuvants in vac-cines that require the generation of a Th1 response along with a CD8 cytotoxic cell response to conferimmunity.

Spatial analysis of Aedes aegypti immatures in Northern Argentina: Clusters and temporal instability Garelli, Fernando Miguel; Espinoza, Manuel O.; Gurtler, Ricardo Esteban The objective of this study was to analyze the spatio-temporal patterns of Aedes aegypti immatures based on four entomological surveys that inspected over 6000 households in a large neighborhood of the city of Clorinda between 2007 and 2008. Global and local spatial point pattern analyses of immature presence or absence, habitat quality (estimated using a previously obtained statistical model) and pupal production were performed. Global analyses showed aggregation of both infestation and habitat quality up to 10 times bigger than previously described, ranging from 150 to 400 m between surveys. Pupal production was also clustered but at smaller scales than infestation presence/absence. The location ofthe clusters was temporally unstable between surveys. There was no spatial structure related to the control strategy; lots treated with temephos and lots uninspected (i.e., closed or refusing) were randomly distributed. These results suggest a combination of exogenous (the aggregation of better quality habitats) and endogenous (dispersal) processes explaining the observed patterns of larger-scale infestation. A spatial targeting strategy at the neighborhood scale would not be as cost-effective in Clorinda as in other sites where stable smaller-scale clusters permit the identification of key premises.

Mercado de trabajo y condicionamiento por color de piel en grandes centros urbanos de la Argentina de Grande, Pablo Ernesto; Salvia, Hector Agustin La discriminación por aspecto físico, y más en particular, el trato diferenciado hacia personas cuyos rasgos remiten a un origen entendido como indígena o no-europeo, constituye un problema escasamente tratado en los estudios de la desigualdad en la Argentina. Esta carencia, sumada a la falta de una articulación en las explicaciones de estos mecanismos relacionados con las desigualdades derivadas de las condiciones de clase, con frecuencia opacan el estudio del fenómeno profundizando sus efectos de invisibilidad. En este sentido, se mantienen ocultas las dificultades que afrontan quienes poseen estos rasgos para sobreponerse a prejuicios que reeditan cotidianamente principios racistas que asocian los rasgos nativos con la delincuencia, la falta de capacidades y saberes y, en términos generales, con la inferioridad socialmente entendida. En este artículo se investiga la incidencia del trato desigual basado en el aspecto físico –en particular, en el color de piel– sobre los logros laborales en una muestra de 2.500 personas de grandes centros urbanos de la Argentina en el año 2007. La discriminación por rasgos físicos, como efecto de la persistencia de principios operativos basados en la racialización de las interacciones sociales, pone de manifiesto la continuidad de principios jerárquicos, simbó- licos y materiales que obstruyen la posibilidad de una mayor igualdad en el desarrollo cotidiano de las condiciones de vida de las personas.; Discrimination by aspect, and more particularly, differential treatment for people whose appearance is classified as indigenous or non-European, is a problem rarely addressed in studies of inequality in Argentina. Moreover, the explanation of these mechanisms is often not related to inequalities derived from class conditions. As a consequence, discrimination by physical aspect (skin color) in Argentina remains unnoticed for most academic and public knowledge, “invisible”. Therefore, all the troubles faced by people who possess these traits stay unseen or overlook. Such unequal treatment, it is worth noting, is rooted in racist principles toward native people (indigenous) associating them with crime, lack of personal capacities and knowledge, and in general, socially inferior. This article investigates the impact of unequal treatment based on physical appearance –in particular skin color– in labor achievements in a sample of 2.500 people in large urban centers of Argentina in 2007. The discrimination based on physical aspect, as an effect of mechanisms based in the racialization of social interactions, shows the continuity of symbolic and material hierarchizing principles that obstruct the possibility of greater equality in the daily development of the conditions of people's lives.

Redes personales y locus de control en centros urbanos de la Argentina; Personal networks and locus of control in large urban centers of Argentina de Grande, Pablo Ernesto El presente estudio se propone analizar la relación entre la representación del locus de control y las estructuras de vínculos interpersonales en la Argentina. A partir de una muestra (n=1500) de hogares representativa de siete grandes centros urbanos (>200 mil habitantes) se examina la relación entre la externalidad del locus de control y diferentes aspectos de las redes personales de cada participante. Los resultados muestran que a mayor cantidad de relaciones disponibles se encuentran niveles inferiores de externalidad del locus de control, así como también menores niveles de externalidad al disponerse de lazos interpersonales fuera del barrio y con vínculos de nivel socioeducativo alto. En este sentido, se verifican asociaciones significativas entre representación de control del entorno y estructuras vinculares.; This study analyzes the relationship between locus of control and interpersonal relations structures in Argentina. After a representative sample (n = 1500) of households in seven major urban centers (>200,000 inhabitants), it examines the relationship between the externality of locus of control and different aspects of personal networks of each respondent. The results show that people having more relations experiment lower levels of externality of locus of control. Likewise, lower levels of externality are informed when personal ties outside the neighborhood are available, as well as ties high educational level. In this regard, significant associations are verified between control and personal relations structures.

On the multi-Koszul property for connected algebras Herscovich Ramoneda, Estanislao Benito In this article we introduce the notion of multi-Koszul algebra for the case of a locally finite dimensional nonnegatively graded connected algebra, as a generalization of the notion of (generalized) Koszul algebras defined by R. Berger for homogeneous algebras, which were in turn an extension of Koszul algebras introduced by S. Priddy. It also extends and generalizes the definition recently introduced by the author and A. Rey. In order to simplify the exposition we consider the minimal graded projective resolution of the algebra A as a bimodule, which may be used to compute the corresponding Hochschild (co)homology groups. This new definition includes several new interesting examples, e.g. the super Yang-Mills algebras introduced by M. Movshev and A. Schwarz, which are not generalized Koszul or even multi-Koszul for the previous definition given by the author and Rey. On the other hand, we provide an equivalent description of the new definition in terms of the Tor (or Ext) groups, and we show that several of the typical homological computations performed for the generalized Koszul algebras are also possible in this more general setting. In particular, we give an explicit description of the A_infinity-algebra structure of the Yoneda algebra of a multi-Koszul algebra. We also show that a finitely generated multi-Koszul algebra with a finite dimensional space of relations is a K_2 algebra in the sense of T. Cassidy and B. Shelton.

El uso del lenguaje estadístico R: herramientas para su uso en docencia e investigación Cid, Fabricio Damian El uso del lenguaje estadístico R: Herramientas para su uso en docencia e investigación. Articulo publicado en la sección "TICs y Docencia" de la Revista Actualidad Analítica"

Trade shocks and factor adjustment frictions: implications for investment and labor Artuç, Erhan; Bet, German; Brambilla, María Irene; Porto, Guido When export opportunities arise, the gains from trade can only be materialized if the economy adjusts. In order to expand and meet new markets, firms must hire new workers and tune their capital stock by investing in product lines, machines and equipment. If this process is costly and imperfect, the economy reacts partially and gradually. We formulate a multi-sector dynamic model featuring capital adjustment costs, firm heterogeneity, and labor mobility costs that we fit to data from Argentina. We estimate the structural capital and labor adjustment cost parameters and using counterfactual simulations we quantify the complementarity between trade shocks and domestic frictions: in the presence of lower costs of factor adjustment there is a sizeable incremental impact of trade shocks on capital, employment, wages, and output. The complementarity is larger for smaller trade shocks, and a large fraction of the capital complementarity is explained by an extensive margin (i.e. firms which do not respond to trade shocks when adjustment costs are high).

Variación espacio-temporal de los diferentes estados de desarrollo de mosquitas blancas Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) en cultivos de soja.; Spatial and temporal variation of the different developmental stages of the sweet potato whitefly Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) in soybean Cavallo, M. J.; Bruno, Marina; Irastorza, R.; Grilli, Mariano Pablo La soja es actualmente el cultivo más importante en la Argentina; a sus plagas tradicionales se ha sumado la mosca blanca, Bernisia tabaci. Los objetivos de este trabajo fueron establecer la distribución espacial de los diferentes estados de desarrollo (huevos, ninfas, pupas y adultos) de B. tabaci en lotes de soja del área central de la provincia de Córdoba (Argentina) y determinar la variación temporal de la abundancia de esos estados en dicha área. Se trabajó con muestras de lotes de dos localidades, Colonia Tirolesa y Colonia Caroya (Dpto. Colón). La comparación de abundancia entre localidades mostró variaciones entre ellas pero sólo se detectaron diferencias significativas entre adultos. Al comparar la variación de las abundancias entre fechas, sólo fue significativamente superior el aumento de ninfas y pupas durante la segunda fecha; en cuanto a los adultos se obtuvo mayor número durante la segunda fecha en Colonia Tirolesa. Cuando se analizó la variación de la abundancia tanto de inmaduros como de adultos se observaron diferencias significativas entre lotes para ambas localidades y para ambas fechas. Los resultados aquí presentados resultan de interés para ser utilizados en la toma de decisiones para el manejo de esta plaga.; Soybean is now-a-days the most important crop in Argentina. Among all insect pests affecting this crop the sweetpotato whitefly, Bemisia tabaci, is becoming a new and increasingly important pest. In this paper we propose as objectives: a) to establish the spatial distribution of the different stages of B. tabaci in soybean plots in the central area of Cordoba province (Argentina) and b) to determine the spatio-temporal variation of the abundance of these stages in the same places. We worked with samples collected in to localities of Colon Department; Colonia Tirolesa and Colonia Caroya. The comparisons between localities showed a high variability between them but only the differences between adults were statistically significative. When we compared the variation of the abundance between sampling dates only the increase of nymphs and pupae were significative during the second sampling date in Colonia Tirolesa. When comparing the differences between soybean plots differences between plots in both localities and in all B. tabaci stages were observed. These results are an important input to be use in decision making for the management of this pest in the area.

A vida com farda: a vestimenta policial como relato institucional em disputa; Life in uniform: police uniform as institutional stories in dispute; La vie en uniforme: l'habillement de la gendarmerie et de la police en tant que récit institutionnel en dispute Sirimarco, Mariana Toda instituição constrói relatos que a sustentam. Narrativas que encenam discursos, vivências e valorizações para, a partir daí, entender-se como grupo social e como instituição. Este trabalho pretende abordar um dos relatos institucionais mais caros à força policial: a farda como investidura. Se me proponho a abordar a figura da farda em tais termos é porque entendo que, em torno dos símbolos que ela encarna, constrói-se um entendimento tanto do indivíduo que o porta quanto do grupo a que ele pertence. É nesta veiculação de entendimentos que reside seu sentido de relato, capaz de funcionar como uma figura de pensamento e de orientar o discurso em uma direção específica. Adentrar-se nos sentidos, que giram numa espécie de rodamoinho e se sedimentam em torno da figura da farda, é uma maneira de começar a tematizar os modos concretos pelos quais instituição e indivíduos pensam a si mesmos.; Institutions build stories to support them; narrations that stimulate speeches, experiences and values from which to think themselves as a social group and an institution. This paper intends to analyze one of the fondest institutional stories of police agency: the uniform as an investiture. The author states the figure of the police uniform in such terms because the symbols embodied in it allow for building an understanding both of the individual wearing the uniform and of the group to which he belongs. Upon that professional and moral understanding lies the sense of the story, which is capable of functioning as a figure of thought and of guiding thespeech in a certain direction. Going deeper into the senses, thatswirl andsettle around the figure of the police uniform, is, finally, a way of beginning to analyze the concrete modes through which individuals and institution think about themselves.; Toute institution construit des récits qui la soutiennent. Ce sont des narratives qui mettent en scène des discours, des histoires de vie et des mise en valeur pour, ensuite, lui permettre de se définir en tant que groupe social et en tant qu'institution. Ce travail a pour but d'aborder les récits institutionnels les plus chers à la force policière : l'uniforme en tant qu'investiture. Si je propose d'aborder le symbole de l'uniforme de cette façon c'est parce que je crois qu'autour des symboles qu'il incarne, se construit une compréhension aussi bien de l'individu qui le porte que du groupe auquel il appartient. C'est dans la transmission de ces compréhensions que réside le sens du récit, capable de fonctionner comme une image de pensée et d'orienter le discours vers une direction spécifique. Pénétrer les sentiments, qui tournent dans une espèce de tourbillon et qui se sédimente autour de la figure de l'uniforme est une manière de commencer à thématiser les modes concrets par lesquels l'institution et les individus pensent à propos d'eux-mêmes.

Mímesis y pólis: sobre el silencio de Aristóteles y el gesto político de su poética Castillo Merlo, Mariana Carolina El objetivo principal de este trabajo es revisar la relación entre mímesis y pólis a partir de las consideraciones de la Poética de Aristóteles. En tal sentido, atenderé en primer lugar a los argumentos que se esgrimen en torno a los silencios de dicha obra y que conducirían a una eventual apoliticidad. En contra de esta posición, pretendo mostrar que en la Poética, Aristóteles sugiere un gesto político, al enfatizar el aprendizaje mimético del cual se pueden inferirse implicancias para la vida en la pólis.

Agricultura tradicional y riqueza de maices (Zea Mays). Estudio de caso en Caspalá, provincia de Jujuy, Argentina Ramos, Rita Soledad; Hilgert, Norma Ines; Lambaré, Daniela Alejandra En Caspalá, se cultivan maíces criollos tradicionales y maíces de incorporación más reciente. La riqueza actual es producto del uso, valoración y manejo de este recurso. Dicha valoración está, a su vez, asociada a las decisiones familiares que reflejan su cultura, tradición y cosmovisión. En este trabajo se analiza la riqueza de maíces cultivados actualmente en Caspalá, los cambios ocurridos en los últimos años, el uso de lo producido y el manejo del espacio agrícola disponible. Se realizaron entrevistas semiestructuradas a 37 (51%) familias de la comunidad. Se reportaron 23 etnotaxa (15 cultivados actualmente y 8 recordados), con un promedio de 6,61 etnotaxa sembrados por familia. Se identificaron como factores que influyen de modo positivo la riqueza de este cultivo los usos asignados a cada etnotaxón, el cultivo en diferentes microambientes y la procedencia de las ?semillas?. Asimismo se halló que el abandono de la actividad trashumante, la disminución de la actividad agrícola en distintos pisos altitudinales y la incorporación de productos alimenticios foráneos contribuyen a la disminución de tal riqueza. Los resultados hallados alertan sobre la importancia de Caspalá como conservador local de maíces y sobre la necesidad de desarrollar acciones que contribuyan a preservar las características actuales.