Seasonal variation and effect of non-native invasive vegetation on two bird communities in northeast of Buenos Aires province, Argentina; Variación estacional y efecto de vegetación exótica invasora sobre dos comunidades de aves en el noreste de la provincia de Buenos Aires, Argentina Palacio, Facundo Xavier; Montalti, Diego We studied seasonal patterns and the effect of non-native invasive vegetation on bird communities in woodland and adjacent herbaceous-shrub areas in north-east Buenos Aires province, Argentina. Diversity, species richness and density of bird species were higher in spring and summer than in fall and winter in both habitat types. We also found significant between-habitat differences in bird species composition in winter, spring and summer. Seasonal variations were mainly due to changes in the abundance of migrants, whereas bird species segregation to each habitat was mostly explained by non-native vegetation structure. Most species were associated with sites dominated by either Dipsacus fullonum or Gleditsia triacanthos, whereas only four species were associated with high Ligustrum lucidum densities. These results show that despite the dominance of non-native invasive plant species at our study site, vegetation structure is still the main factor structuring bird communities. In addition, some plant species, such as L. lucidum, seem to have a negative effect on bird communities by reducing their diversity, whereas others, such as D. fullonum and G. triacanthos, seem to have a positive effect compared to L. lucidum by providing not only food resources during a great part of the year but also nest sites.; Estudiamos los patrones estacionales y el efecto de vegetación exótica invasora en comunidades de aves de bosque y zonas herbá- ceo-arbustivas adyacentes en el noreste de la provincia de Buenos Aires, Argentina. Diversidad, riqueza y densidad de aves fueron mayores en primavera-verano que en otoño-invierno en ambos tipos de ambiente. Además, encontramos diferencias significativas entre hábitats en la composición de especies en invierno, primavera y verano. Las variaciones estacionales en los atributos comunitarios se debieron principalmente a cambios en la abundancia de aves migratorias, mientras que la segregación de especies en ambos ambientes estuvo explicada en gran parte por la estructura de la vegetación de especies exóticas invasoras. La gran mayoría de las especies de aves estuvieron asociadas a sitios dominados por Dipsacus fullonum ó Gleditsia triacanthos, mientras que sólo cuatro especies estuvieron asociadas a sitios con altas densidades de Ligustrum lucidum. Nuestros resultados muestran que a pesar de la dominancia de vegetación exótica invasora en nuestro sitio de estudio, la estructura de la vegetación es el principal factor que estructura las comunidades de aves. Asimismo, algunas especies exóticas, como L. lucidum, tendrían un efecto negativo sobre las comunidades de aves al disminuir su diversidad, mientras que otras, como D. fullonum y G. triacanthos, tendrían un efecto positivo en comparación con L. lucidum al proveer no solo alimento durante gran parte del año, sino también sitios de nidificación.

Effectiveness of fluoxetine to control fur-chewing behaviour in the chinchilla (Chinchilla lanigera) Galeano, Maria G.; Ruiz, Ruben Daniel; Fiol de Cuneo, Marta; Ponzio, Marina Flavia Due to its complexity and the relative lack of scientific reports, fur-chewing may be considered as one of the most challenging behavioural problems common to captive chinchillas. The development of this behaviour in commercial farms and the increasing popularity of this species as a pet have increased the public demands for a treatment. The objective of this work was to evaluate the effectiveness of fluoxetine to control the development of chinchillas’ fur-chewing behaviour, using an oral dose of 10 mg/kg/day for a 90 days treatment period. For the measurement of the fur-chewing affected area and its variation during treatment as external sign of whether or not the behaviour was controlled, digital pictures were taken at 0, 45, 75 and 90 days of treatment and after drug withdrawal at 140 days. Results indicated that the greatest difference in percentages of body area affected by the behaviour in control vs. treated animals was observed after 75 days of treatment. However, this was not due to a decrease in the amount of body area affected by fur-chewing in treated animals, but conversely to an increase in the symptoms observed in control animals, that showed a ~10% increase in the fur-chewing affected body area than at the beginning of the experiments. Only ~46% of the fluoxetine treated animals showed a significant reduction in the body area affected by fur-chewing. In summary, the use of fluoxetine in fur-chewing chinchillas showed limited success, mostly reducing the progression of the behaviour.

Determinations of gas–liquid partition coefficients using capillary chromatographic columns. Alkanols in squalane Tascon, Marcos; Romero, Lilian M.; Acquaviva, Agustín; Keunchkarian, Sonia; Castells, Cecilia Beatriz Marta This study focused on an investigation into the experimental quantities inherent in the determination of partition coefficients from gas–liquid chromatographic measurements through the use of capillary columns.Wepreparedseveral squalane – (2,6,10,15,19,23-hexamethyltetracosane) – containing columns with very precisely known phase ratios and determined solute retention and hold-up times at 30, 40, 50 and 60 ◦C. We calculated infinite dilution partition coefficients from the slopes of the linear regression of retention factors as a function of the reciprocal of the phase ratio by means of fundamental chromatographic equations. In order to minimize gas–solid and liquid–solid interface contributions to retention, the surface of the capillary inner wall was pretreated to guarantee a uniform coat of stationary phase. The validity of the proposed approach was first tested by estimating the partition coefficients of n-alkanes between n-pentane and n-nonane, for which compounds data from the literature were available. Then partition coefficients of sixteen aliphatic alcohols in squalane were determined at those four temperatures. We deliberately chose these highly challenging systems: alcohols in the reference paraf- finic stationary phase. These solutes exhibited adsorption in the gas–liquid interface that contributed to retention. The corresponding adsorption constant values were estimated.We fully discuss here the uncertainties associated with each experimental measurement and how these fundamental determinations can be performed precisely by circumventing the main drawbacks. The proposed strategy is reliable andmuchsimpler thanthe classical chromatographicmethod employing packed columns.

Effect of buffer systems and disaccharides concentration on Podoviridae coliphage stability during freeze drying and storage Dini, Cecilia; De Urraza, Patricio José The aims of this study were to determine the stability of Podoviridae coliphage CA933P during lyophilization and storage in different media, and to establish similarities between the results obtained and those expected through mechanisms described for proteins stabilization during freeze-drying. PBS and SM buffer were assayed as lyophilization media. The effect of inorganic salts concentration as well as the addition of disaccharides on phage stability during freeze-drying and storage was also studied. The addition of low suc rose concentration (0.1 mol l1 ) to SM buffer stabilized phage during freezing and dryi ng steps of the lyophilization process, but higher sugar concentrations were detriment al to phage stability during freeze-drying. Sucrose stabilized phage during storage for at least 120 days. The lyoprotective effect of low concentrations of disaccharides during the drying step of the lyophilization of proteins as well as the stabilization of the freeze-dried produc t in time correlated with the results obtained for phage CA933P.

Mathematical Modeling of Bivariate Distributions of Polymer Properties Using 2D Probability Generating Functions. Part II: Transformation of Population Mass Balances of Polymer Processes Brandolin, Adriana; Asteasuain, Mariano This is the second of two works presenting a new mathematical method for modeling bivariate distributions of polymer properties. It is based on the transformation of population balances using 2D probability generating functions (pgf) and a posteriori recovery of the distribution from the transform domain by numerical inversion. Part I of this work was devoted to the numerical inversion step. Here the transformation of the population balances to the pgf domain is analyzed. A 2D pgf transform table is developed, which allows a simple transformation of any typical polymer balance equation. Three copolymerization examples are used to show the application of the complete procedure of this modeling technique.

Physical Properties of Aqueous Solutions of Pectin Containing Sunflower Wax Baumler, Erica Raquel; Carelli Albarracin, Amalia Antonia; Martini, Silvana The aim of this study is to investigate the physical properties of aqueous solutions of pectin (PA) containing sunflower wax (SFW), which are used as a basis for producing edible films. The stability and the rheological and microstructural characteristics of SFW/PA mixtures were evaluated. SFW/PA mixtures formed oil-in-water emulsions that were milky and opaque in appearance and were stable towards phase separation. Polarized micrographs revealed the presence of wax crystals, whose size decreased as pectin concentration increased. The rheological behavior of the aqueous solutions of pectin containing different amounts of SFW were best described by the generalized power law model of Herschel-Bulkley (H-B), which gave the best fit in all the range of shear rate values. Apparent viscosities and yield stress were determined using this model, and both properties increased with increasing pectin content. The apparent viscosity values were between 0.0095 and 0.1031 Pa s. SFW addition resulted in a small decrease in viscosity for emulsions formulated with 1 and 2 % PA, but the opposite effect was observed for emulsions formulated with 3 % PA. In addition, shear stress values were higher for emulsions with higher PA content, but were not affected by SFW addition.

Delocalized and localized states of eg electrons in half-doped manganites Winkler, Elin Lilian; Tovar, Manuel; Causa, M. T. We have studied the magnetic behaviour of half-doped manganite Y0.5Ca0.5MnO3 in an extended range of temperatures by means of magnetic susceptibility and electron spin resonance (ESR) experiments. At high temperature the system crystallizes in an orthorhombic structure. The resistivity value ~0:05 Ohm.cm at 500 K, indicates a metallic behaviour, while the Curie-Weiss dependence of the susceptivility and the thermal evolution of the ESR parameters are very well described by a model that considers a system conformed by localized Mn4+ cores,t2g^3, and itinerant, eg, electrons. The strong coupling between t2g and eg electrons results in an enhanced Curie constant and an FM Curie-Weiss temperature that overcomes the AFM interactions between the t2g^3 cores. A transition to a more distorted phase is observed at T ~500 K and signatures of localization of the eg electrons appear in the susceptibility behaviour below 300 K. A new Curie-Weiss regime is observed, where the Curie-constant value is consistent with dimer formation. Based on mean-field calculations, the dimer formation predicted as a function of the interaction strength between the t2g and eg electrons.

Notas sobre el desarrollo del conocimiento técnico aplicado en los procesos de trabajo.; Notes on the development of knowledge “technical” applied in work processes Cristobo, Matias Este artículo se propone reflexionar sobre el carácter ideológico de la ciencia y la técnica analizado por Herbert Marcuse y Jürgen Habermas a partir de una lectura de la obra de Marx. La discusión entre los dos primeros autores incluye categorías y problemáticas fundamentales para la tradición marxista: desarrollo de las fuerzas productivas, relaciones de producción, proletariado como sujeto revolucionario, intervención del Estado en la regulación de los procesos económicos, etc. Pero la discusión precedente también incluye una interpretación sobre el devenir de la ciencia y la técnica convertidas de inmediato en una fuerza productiva. Voy a detenerme en mi trabajo sobre este punto en particular. En primer lugar, me propongo exponer y analizar la propia posición de Marx referida al tema, presente en forma condensada en la sección de los Elementos Fundamentales para la Crítica de la Economía Política [Grundrisse] vinculada al desarrollo del capital fijo (y maquinaria). En segundo lugar, me detendré en las dos lecturas propuestas por Marcuse y Habermas que parten, precisamente, del mismo pasaje de los Grundrisse. Finalmente, intentaré exponer brevemente las similitudes y diferencias que suponen los planteos aquí tratados.; This article aims to reflect on the character "ideology" of science and technology discussed by Herbert Marcuse and Jürgen Habermas from a reading of Marx's work. The discussion between the first two categories and authors include fundamental issues for the Marxist tradition: development of productive forces, relations of production, the proletariat as revolutionary subject, state intervention in the regulation of economic processes, etc.. But the preceding discussion also includes an interpretation of the future of science and technology immediately converted into a productive force. I will focus on my work on this particular point. First, I propose to present and analyze Marx's own position relating to the subject, in condensed form in this section of the key elements to the Critique of Political Economy [Grundrisse] linked to the development of fixed capital (and machinery). Second, I will consider the two readings proposed by Marcuse and Habermas departing precisely the same passage from the Grundrisse. Eventually we briefly outline the similarities and differences that pose the proposals discussed here.

Novel interactions of GRP78: UPR and estrogen responses in the brain Avila, Marco Fidel; Cabezas, Ricardo; Torrente, Daniel; Gonzalez, Janneth; Morales, Ludis; Alvarez, Lisandro; Capani, Francisco; Barreto, George E. Glucose-regulated protein 78 (GRP78; 78 kDa) belongs to a group of highly conserved heat shock proteins (Hsp) with important functions at the cellular level. The emerging interest for GRP78 relies on its different functions, both in normal and pathological circumstances. GRP78 regulates intracellular calcium, protein shaping, endoplasmic reticulum (ER) stress and cell survival by an immediate response to insults, and that its expression may also be regulated by estrogens. Although these roles are well explored, the mechanisms by which GRP78 induces these changes are not completely understood. In this review, we highlight various aspects related to the GRP78 functioning in cellular protection and repair in response to ER stress and unfolded protein response by the regulation of intracellular Ca2+ and other mechanisms. In this respect, the novel interactions between GRP78 and estrogens, such as estradiol and others, are analyzed in the context of the central nervous system (CNS). We also discuss the importance of GRP78 and estrogens in brain diseases including ischemia, Alzheimer's and Huntington's disorders. Finally, the main protective mechanisms of GRP78 and estrogens during ER dysfunction in the brain are described, and the prospective roles of GRP78 in therapeutic processes.

Vacuna terapéutica CSF-470 para melanoma cutáneo Aris, Mariana; Barrio, Maria Marcela; Mordoh, Jose El melanoma cutáneo es la patología tumoral con mayor incidencia de crecimiento. Una vez que hace metástasis, es resistente a los tratamientos convencionales, con pronóstico reservado. Recientemente han surgido nuevas estrategias terapéuticas con resultados alentadores, incluyendo la inmunoterapia. En esta nota nos centraremos en el uso de vacunas, en particular en la vacuna alogeneica irradiada CSF-470, coadyuvada con BCG y Molgramostim (GM-CSF), para el tratamiento adyuvante de pacientes con melanoma cutáneo estadios IIB, IIC o III post-cirugía. Describiremos los resultados del estudio clínico de fase I y el diseño del estudio actual de fase II-III activo

Highly selective copper nanoparticles for the hydrogenation of,-unsaturated aldehydes in liquid phase Gutierrez, Victoria Soledad; Nador, Fabiana Gabriela; Radivoy, Gabriel Eduardo; Volpe, María Alicia Unsupported copper nanoparticles (CuNPs), 3–4 nm in size, are obtained from the reduction of the corresponding metal chloride through an electron transfer from a lithium arenide. CuNPs are tested for the liquid phase hydrogenation of cinnamaldehyde in batch conditions by using H2. High activity and selectivity to cinnamyl alcohol (87%, at high conversion) are reached. When CuNPs are supported on MCM-41 and on high surface area CeO2, TEM and XRD characterization shows that the nanometric size of copper is retained. For the hydrogenation of crotonaldehyde or of cinnamaldehyde, CuNPs/MCM-41 and CuNPs/CeO2 are less active and less selective than unsupported nanoparticles. However the selectivity levels reached by these catalysts are higher than those obtained over noble metal (Au and Pt) based catalysts, tested under the same reaction conditions. The catalytic properties of supported and unsupported CuNPs would be related to the nanometric size of copper

Hydration of Barium Monohydroxide in (H2O)1-3 Clusters: Theory and Experiment Cabanillas Vidosa, Ivan; Rossa, Maximiliano; Pino, Gustavo Ariel; Ferrero, Juan Carlos; Cobos, Carlos Jorge The ionization energies (IEe´s) of small BaOH(H2O)m clusters (m = 1-3), as generated in a laser vaporization-supersonic expansion source have been determined by laser photoionization experiments over the 3.65?4.55 eV energy range. Complementary ab initio studies show that the IEe´s are in good agreement with computed adiabatic ionization energies, and that BaOH(H2O)m structures with a direct coordination of the Ba atom to water molecules are favored over those that are characterized by H-bonded networks involving H2O molecules and the OH group of BaOH. Additional calculations have been performed on the hydration energies for the most stable isomers of the relevant BaOH(H2O)1-3 clusters. A comparison is made between the closed-shell title system and the results of related theoretical studies on the open-shell alkali monohydroxides, which allows for an interpretation of the opposite trends that are found in the cluster size dependence of the vertical ionization energies for both series of systems, and highlights the role of the BaOH unpaired electron in its ionization process. Altogether, the present evidence suggests for the initial steps of the BaOH hydration process to be dominated by electrostatic and polarization interactions between the Ba+ and OH? ion cores, which become both increasingly solvated upon sequential addition of water molecules.

Critical behavior of self-assembled rigid rods on two-dimensional lattices: Bethe-Peierls approximation and Monte Carlo simulations López, Luis Gonzalo; Linares, D. H.; Ramirez Pastor, Antonio Jose; Stariolo, D. A.; Cannas, Sergio Alejandro The critical behavior of adsorbed monomers that reversibly polymerize into linear chains with restricted orientations relative to the substrate has been studied. In the model considered here, which is known as self-assembled rigid rods (SARRs) model, the surface is represented by a two-dimensional lattice and a continuous orientational transition occurs as a function of temperature and coverage. The phase diagrams were obtained for the square, triangular, and honeycomb lattices by means of Monte Carlo simulations and finite-size scaling analysis. The numerical results were compared with Bethe-Peierls analytical predictions about the orientational transition for the square and triangular lattices. The analysis of the phase diagrams, along with the behavior of the critical average rod lengths, showed that the critical properties of the model do not depend on the structure of the lattice at low temperatures (coverage), revealing a quasi-one-dimensional behavior in this regime. Finally, the universality class of the SARRs model, which has been subject of controversy, has been revisited.

The immature stages of Phylloicus lituratus (Trichoptera: Calamoceratidae) with new records of Phylloicus and Banyallarga species in northwestern Argentina and southern Bolivia Rueda Martin, Paola Alejandra Phylloicus lituratus Banks 1920 larva and pupa were associated. It is a new record for Argentina and represents the most austral record for the species. New records of other Calamoceratidae species are provided also from northwestern Argen-tina and southern Bolivia. Banyallarga (B.) argentinica Flint 1983 is recorded for the first time for Bolivia; B. (B.) loxana (Navás 1934) and B .(B.) yungensis Flint 1983 are both newly recorded from Salta province in northwestern Argentina. Illustrations of male genitalia of all species and of immature stages of P. lituratus are included. Presence of a Banyallarga larva in a leaf case suggests a need to change some larval keys used to identify the two endemic genera of Neotropical Calamoceratidae.

Some remarks on distributive semilattices Celani, Sergio Arturo; Calomino, Ismael Maria In this paper we shall give a survey of the most important characterizations of the notion of distributivity in semilattices with greatest element and we will present some new through annihilators and relative maximal filters. We shall also simplify the topological representation for distributive semilattices given in cite{Celani} and show that the meet-relations are closed under composition. So, we obtain that the $DS$-spaces with meet-relations is a category dual to the category of distributive semilattices with homomorphisms. These results complete the topological representation presented in cite{Celani} without the use of ordered topological spaces. Finally, following the work of G. Bezhanishvili and R. Jansana in cite{Bezhanishvili-Jansana II}, we will prove a characterization of homomorphic images of a distributive semilattice $A$ by means of family of closed subsets of the dual space endowed with a lower Vitories topology.

Higher-capacity lithium ion battery chemistries for improved residential energy storage with micro-cogeneration Darcovich, K.; Henquín, Eduardo Rubén; Kenney, B.; Davidson, I. J.; Saldanha, N.; Beausoleil Morrison, I. Combined heat and power on a residential scale, also known as micro-cogeneration, is currently gaining traction as an energy savings practice. The configuration of micro-cogeneration systems is highly variable, as local climate, energy supply, energy market and the feasibility of including renewable type components such as wind turbines or photovoltaic panels are all factors. Large-scale lithium ion batteries for electrical storage in this context can provide cost savings, operational flexibility, and reduced stress on the distribution grid as well as a degree of contingency for installations relying upon unsteady renewables. Concurrently, significant advances in component materials used to make lithium ion cells offer performance improvements in terms of power output, energy capacity, robustness and longevity, thereby enhancing their prospective utility in residential micro-cogeneration installations. The present study evaluates annual residential energy use for a typical Canadian home connected to the electrical grid, equipped with a micro-cogeneration system consisting of a Stirling engine for supplying heat and power, coupled with a nominal 2 kW/6 kW h lithium ion battery. Two novel battery cathode chemistries, one a new Li–NCA material, the other a high voltage Ni-doped lithium manganate, are compared in the residential micro-cogeneration context with a system equipped with the presently conventional LiMn2O4 spinel-type battery.

High temperature far-infrared dynamics of orthorhombic NdMnO3: emissivity and reflectivity Massa, Nestor Emilio; del Campo, Leire; De Sousa Meneses, Domingos; Echegut, Patrick; Martínez Lope, María Jesús; Alonso, José Antonio We report on near normal far- and mid-infrared emission and reflectivity of NdMnO3 perovskite from room temperature to sample decomposition above 1800 K. At 300 K the number of infrared active phonons is in close agreement with the 25 calculated for the orthorhombic D16 2h–Pbnm (Z = 4) space group. Their number gradually decreases as we approach the temperature of orbital disorder at ∼1023 K where the orthorhombic O0 lower temperature cooperative phase coexists with the cubic orthorhombic O. At above ∼1200 K, the three infrared active phonons coincide with that expected for cubic Pm-3m (Z = 1) in the high temperature insulating regime. Heating samples in dry air triggers double exchange conductivity by Mn3+ and Mn4+ ions and a small polaron mid-infrared band. Fits to the optical conductivity single out the octahedral antisymmetric and symmetric vibrational modes as the main phonons in the electron–phonon interactions at 875 K. For 1745 K, it is enough to consider the symmetric stretching internal mode. An overdamped defect induced Drude component is clearly outlined at the highest temperatures. We conclude that rare earth manganite eg electrons are prone to spin, charge, orbital, and lattice couplings in an intrinsic orbital distorted perovskite lattice, favoring embryonic low energy collective excitations.

La poética del extrañamiento: el dominio incaico como delegación, pérdida, captura, entrega y negación del ser. Un repaso de la arqueología de alta montaña surandina Mignone Gambetta, Pablo Ignacio La arqueología de alta montaña busca perfilarse como una disciplina autónoma con sus propias metodologías, aproximaciones teóricas y técnicas. Para ello ha creado una forma de estudiarel pasado incaico descuidando las relaciones interétnicas suscitadas durante su expansionismo y el rol de las comunidades no estatales. La arqueología a secas es entendida por esta corriente como una actividad cómoda y fácil, mientras que la especialidad de montaña, a fuerza de piernas, es la única cuyo desarrollo aporta no al estudio del pasado en sí, sino a la relación entre los “incas y la montaña”, de la misma forma en que se suceden uno a uno escritos donde lo que resalta es la relación íntima que se establece entre “el arqueólogo con la montaña”, el “arqueólogo con el inca” y, en conclusión necesaria, “del arqueólogo consigo mismo”. Planteamos luego de un estudio de las principales obras de referencia de esta especialidad en Argentina, que la “arqueología de alta montaña” es, en algunos casos, antes que un estudio del pasado, un reflejo del exitismo del montañismo del presente, situando la temática dentro del campo de los deportes extremos antes que de los desafíos intelectuales de la arqueología o de la antropología.

Engineering Pseudomonas protegens Pf-5 for Nitrogen Fixation and its Application to Improve Plant Growth under Nitrogen-Deficient Conditions Setten, Lorena María; Soto, Gabriela Cynthia; Mozzicafreddo, Matteo; Fox, Ana Romina; Lisi, Christian Daniel; Cuccioloni, Massimiliano; Angeletti, Mauro; Pagano, Elba; Díaz Paleo, Antonio Horacio; Ayub, Nicolás Daniel Nitrogen is the second most critical factor for crop production after water. In this study, the beneficial rhizobacterium Pseudomonas protegens Pf-5 was genetically modified to fix nitrogen using the genes encoding the nitrogenase of Pseudomonas stutzeri A1501 via the X940 cosmid. Pf-5 X940 was able to grow in L medium without nitrogen, displayed high nitrogenase activity and released significant quantities of ammonium to the medium. Pf-5 X940 also showed constitutive expression and enzymatic activity of nitrogenase in ammonium medium or in nitrogen-free medium, suggesting a constitutive nitrogen fixation. Similar to Pseudomonas protegens Pf-5, Pseudomonas putida, Pseudomonas veronii and Pseudomonas taetrolens but not Pseudomonas balearica and Pseudomonas stutzeri transformed with cosmid X940 showed constitutive nitrogenase activity and high ammonium production, suggesting that this phenotype depends on the genome context and that this technology to obtain nitrogen-fixing bacteria is not restricted to Pf-5. Interestingly, inoculation of Arabidopsis, alfalfa, tall fescue and maize with Pf-5 X940 increased the ammonium concentration in soil and plant productivity under nitrogen-deficient conditions. In conclusion, these results open the way to the production of effective recombinant inoculants for nitrogen fixation on a wide range of crops.

Modelo de evaluación de gestión de residuos industriales aplicado en arenas descartadas de fundición; Industrial waste management evaluation model applied to discarded foundry sands Miguel, Roberto Esteban; Porta, Atilio Andrés; Banda Noriega, Roxana Bettina Las arenas descartadas de fundición (ADF), residuo generado por las fundiciones, son dispuestas en vertederos controlados y no controlados. El objetivo del trabajo fue analizar químicamente las arenas y determinar la modalidad adecuada de disposición al aplicar el modelo de evaluación de manejo de residuos industriales bajo diferentes condiciones climáticas. Se colectaron 12 muestras y se sometieron a ensayos de lixiviación para determinar el contenido de fenoles y metales pesados; 10 de las muestras presentaron concentraciones inferiores a lo establecido en la Ley de Residuos Peligrosos. El modelo determinó que en áreas con extrema vulnerabilidad a la contaminación del recurso hídrico subterráneo, bajo condiciones de clima subhúmedo y húmedo, deben utilizarse vertederos con impermeabilización compuesta para disponer las ADF con concentraciones de fenoles mayores 0,001 mg.L-1, y para las ADF que provienen del sistema alquídico uretánico con Pb como constituyente.; Waste foundry sands (WFS), discarded material generated by metal foundries, are disposed in either controlled or uncontrolled landfills. The present study was aimed to chemically analyze the sands and assess their disposal by means of an evaluation model of industrial waste under different climate conditions. Twelve samples were collected and subjected to leach tests to determine phenols and heavy metals concentrations. Ten of them showed concentrations below the regulatory limits of the Hazardous Waste Act. The model found that in areas with extreme vulnerability to pollution of groundwater resources, under humid climate conditions, composite lined landfills should be used to dispose the WFS with concentrations of phenols higher than 0.001 mg.L-1, and for WFS that use urethane alkyd system with Pb as a constituent.