Real-Space Mapping of Fano Interference in Plasmonic Metamolecules Alonso Gonzalez, Pablo; Schnell, Martin; Sarriugarte, Paulo; Sobhani, Heidar; Wu, Chihhui; Arju, Nihal; Khanikaev, Alexander; Golmar, Federico; Albella, Pablo; Arzubiaga, Libe; Casanova, Felix; Hueso, Luis E.; Nordlander, Peter; Shvets, Gennady; Hillenbrand, Rainer An unprecedented control of the spectral response of plasmonic nanoantennas has recently been achieved by designing structures that exhibit Fano resonances. This new insight is paving the way for a variety of applications, such as biochemical sensing and surface-enhanced Raman spectroscopy. Here we use scattering-type near-field optical microscopy to map the spatial field distribution of Fano modes in infrared plasmonic systems. We observe in real space the interference of narrow (dark) and broad (bright) plasmonic resonances, yielding intensity and phase toggling between different portions of the plasmonic metamolecules when either their geometric sizes or the illumination wavelength is varied.

Long term effects of fire on ectomycorrhizas and soil properties in Nothofagus pumilio forests in Argentina Longo, Maria Silvana; Urcelay, Roberto Carlos; Nouhra, Eduardo Ramon The forests of Nothofagus pumilio have historically been affected by forest fires. The effects of fire on certain above and belowground, biotic and abiotic components of these ecosystems have been previously documented, albeit belowground components have received much less attention. It has been suggested that the effects observed in the short-term after a fire usually differ from the longer-term effects. The long-term effects of fire (i.e. >5 years after burning) on belowground components in Nothofagus forests are currently unknown. In the present study we evaluated the long-term effect of fire on ectomycorrhiza (ECM) colonization and morphotype composition in N. pumilio roots, as well as soil chemical properties in temperate forests in Patagonia. Sampling was conducted in three mature monospecific forests. In each, nearby burned and unburned sites were selected. The time since the occurrence of fires differed between areas (i.e. 6?10 years). Within each site, 3 transects of 40 m were established randomly along which 5 samples of roots and soil were collected in spring and autumn. The main results were: (1) in comparison with the unburned site, ECM colonization was lower in the burned site in the area with the shorter time length since fire occurrence and no effects in the other two areas were observed; (2) richness and diversity were not significantly affected by fire but there was a significant effect of season for both parameters, being higher in spring; (3) ECM dominance was significantly higher in the unburned than in the burned site in Tronador, while in Challhuaco the opposite was observed, mainly in autumn; (4) in general carbon, nitrogen and phosphorous decreased while pH increased in the burned sites; (5) ECM colonization positively correlated with NH4+ and phosphorus and negatively with pH but was not significantly correlated with organic matter or any other soil variable. Altogether the results suggest that effects of fire on ectomycorrhiza and soil properties in N. pumilio forests are probably related to the time elapsed since fire occurrence combined with site characteristics. In addition, the direct and indirect effects of fire in these forest systems may persist for more than 10 years.

The Amblyomma (Acari: Ixodida: Ixodidae) of Mexico: identification keys, distribution and hosts Guzmán Cornejo, Carmen; Robbins, Richard G.; Guglielmone, Alberto Alejandro; Montiel Parra, Griselda; Pérez, Tila María Taxonomic keys, distributional data and hosts are provided for the 26 Amblyomma species known from Mexico. Members of this genus have been collected in 30 of Mexico’s 32 states and are associated with 43 nominal vertebrate taxa, of which 40 have been identified to species and four (Python sp., Myrmecophaga tridactyla, Tamandua tetradactyla, Tupinambis teguixin) are non-native. Mammals are the principal class of vertebrates parasitized by Mexican Amblyomma species, followed by reptiles, birds and amphibians. Our knowledge of Mexican Amblyomma is still far from complete because many potential hosts have not yet been examined and vast areas of the country remain unexplored.

Ru/La2O3–SiO2 catalysts for hydrogen production in membrane reactors Faroldi, Betina María Cecilia; Lombardo, Eduardo Agustin; Cornaglia, Laura Maria Binary La2O3–SiO2 supports were employed to obtain active, stable Ru catalysts with high dispersions for the dry reforming of methane. Supports with 15, 27, 40 and 50 wt.% of La2O3 were prepared by incipient wetness impregnation of La(NO3)3 on SiO2. The Ru loading was 0.6 wt.% for all catalysts. The solids were evaluated in a fixed-bed reactor under differential conditions. Previously, they were reduced at 550 ◦C. All the formulations were stable for at least 100 h on stream. Subsequently, the most active catalyst (Ru/La2O3(50)–SiO2) was tested in a membrane reactor using different feed mixtures with and without O2. The reactor configuration was formed by a fixed-bed reactor followed by a membrane reactor. The methane conversion increased when the CO2/CH4 ratio increased from 1.0 to 1.9 and when oxygen was added to the feed. Operating under conditions of combined reforming (oxygen addition) and CO2/CH4 ratio equal to 1, a high production of hydrogen was also achieved in the membrane reactor.

Effect of the organochlorine pesticide endosulfan on GnRH and gonadotrope cell populations in fish larvae Piazza, Yanina Grisel; Pandolfi, Matias; Lo Nostro, Fabiana Laura Endocrine-disrupting chemicals can influence the hypothalamus-pituitary- gonad axis and possibly affect reproduction in vertebrates. We analyzed the effect of 30-day endosulfan (ES) exposure in sexually undifferentiated larvae of the cichlid fish Cichlasoma dimerus. The number, area, mean cytoplasmic and nuclear diameter, and mean cytoplasmic optical density of gonadotropin-releasing hormone (GnRH) I, II, and III immunoreactive (ir-) neurons and β follicle-stimulating hormone (βFSH) ir-cells were measured. Animals exposed to the highest ES concentration (0.1 μg/l) showed a decrease in GnRH I nucleus/cytoplasm area ratio upon exposure. Nuclear area and mean nuclear diameter of βFSH ir-cells was higher in ES treated fish. βFSH nucleus/cytoplasm area ratio was high in exposed animals, and animals exposed to 0.1 μg/l ES showed smaller mean cytoplasmic optical density. These findings suggest that ES affects GnRH I and βFSH protein synthesis/release. However, these responses seem to be insufficient to affect gonadal differentiation at this stage of development.

Effect of indigenous mycorrhizal colonization on phosphorus-acquisition efficiency in soybean and sunflower Fernández, Mariana Cecilia; Gutiérrez Boem, Flavio Hernán; Rubio, Gerardo Despite a general consent about the beneficial contribution of arbuscular mycorrhizal fungi (AMF) on natural ecosystems, there is an intense debate about their role in agricultural systems. In this work, soybean (Glycine max L.) and sunflower (Helianthus annuus L.) field plots with different P availabilities were sampled across the Pampean Region of Argentina (> 150 samples from Mollisols) to characterize the relationship between available soil P and indigenous mycorrhizal colonization. A subsequent pot experiment with soybean and sunflower was carried out to evaluate the effect of P supply (0, 12, and 52 mg Pkg -1) and AMF inoculation on AMF colonization and crop responsiveness to P in a Mollisol. Both crops showed high AMF colonization in the field (average: 55% for soybean and 44% for sunflower). While mycorrhizal colonization in soybean was significantly and negatively related to available soil P, no such trends were apparent in sunflower. Also, total biomass was 3.5 and 2.0 times higher in mycorrhizal than in nonmycorrhizal pot-grown soybean under low- and medium-P conditions, respectively. Sunflower, on the other hand, did not benefit from AMF symbiosis under medium and high P supply. While mycorrhization stimulated P-uptake efficiency in soybean, the generally high P efficiency in sunflower was not associated with AMF symbiosis.

Habitat specificity can blur the predictions of species-energy theory: A case study of tenebrionid beetles adapted to aridity Carrara, Rodolfo; Vazquez, Diego P.; Flores, Gustavo Ernesto Species-energy theory predicts a positive relationship between species richness and energy. The mechanism assumed by this theory is that high energy promotes high population abundance, which in turn promotes high species richness. Evaluations of this mechanism have rendered conflicting evidence, suggesting that more effort is needed to understand the theory's limitations. Several studies have addressed these limitations, contributing to expand the theory's scope by incorporating energy variation, whereas others have demonstrated scale dependence of the more individuals hypothesis. We propose that another limitation of this theory is related to its application to groups of species with strong habitat specificity. We suggest that the expected relationship between energy and richness is not necessarily positive at large scales for groups of species adapted to harsh environments. Using data on tenebrionid beetles from arid areas of southern South America, we contrasted four hypotheses that lead to contrasting predictions about the strength and direction of the species-energy relationship on tenebrionid richness. We found a negative relationship between richness and energy availability. We propose that this negative relationship is the result of a constraint in the mechanisms assumed by species-energy theory because organisms evolve adaptations to survive climatic harshness, which influences population abundances.

Actualización en el tratamiento del síndrome urémico hemolítico endémico: Patogénesis y tratamiento de la complicación sistémica más grave de las infecciones por Escherichia coli productor de toxina Shiga; Update on the treatment of endemic hemolytic uremic syndrome. Pathogenesis and treatment of the most severe systemic complication of infections by Shiga toxin-producing Escherichia coli Fernández Brando, Romina Jimena; Bentancor, Leticia Verónica; Mejias, María Pilar; Panek, Cecilia Analía; Cabrera, Gabriel Gustavo; Exeni, Ramón A.; Palermo, Marina Sandra La forma típica o post-diarreica del síndrome urémico hemolítico (SUH) es la complicación más grave de las infecciones por cepas de Escherichia coli productoras de toxina Shiga (STEC). En la Argentina el SUH es un problema crítico de salud pública, ya que representa la principal causa de falla renal aguda en la infancia, la segunda causa de falla renal crónica, y aporta el 20% de los casos de transplante renal durante la infancia y la adolescencia. A pesar de los avances en el conocimiento de su patogénesis, el único tratamiento actual de los pacientes con SUH es de sostén, y no existen terapias específicas ni preventivas. En la presente revisión expondremos los conocimientos básicos de los mecanismos patogénicos y discutiremos los enfoques terapéuticos tradicionales e innovadores, con especial foco en la situación nacional y los aportes hechos por grupos de la Argentina.; The typical form of hemolytic uremic syndrome (HUS) is the major complication of Shiga toxin-producing Escherichia coli (STEC) infections. HUS is a critical health problem in Argentina since it is the main cause of acute renal failure in children and the second cause of chronic renal failure, giving account for 20% of renal transplants in children and adolescents in our country. In spite of the extensive research in the field, the mainstay of treatment for patients with HUS is supportive therapy, and there are no specific therapies preventing or ameliorating the disease course. In this review, we present the current knowledge about pathogenic mechanisms and discuss traditional and innovative therapeutic approaches, with special focus in national status and contributions made by Argentinean groups.

Study of the water-gas shift reaction over Pt supported on CeO2–ZrO2 mixed oxides Vignatti, Charito Ivana; Avila, Maria Sol; Apesteguia, Carlos Rodolfo; Garetto, Teresita Francisca The water gas shift (WGS) reaction was studied on Pt/CeO2, Pt/ZrO2 and Pt/CexZrx-1O2 catalysts. All the samples were characterized by a variety of physical and spectroscopic techniques. The catalysts activities were evaluated at 250°C in a recirculating reactor through CO conversion versus time test and also by in situ diffuse reflection infrared Furier transform spectroscopy (DRIFT). The samples activity for the WGS reaction depended on chemical composition. Pt/CexZrx-1O2 catalysts with x≥0.5 were more active than Pt/CeO2, probably because the addiction of Zr to ceria increased both the surface area and the reducibility of ceria. The lowest CO conversion rates were obtained on Pt/ZrO2 and Zr-rich Pt/CexZrx-1O2 samples. Based on DRIFT experiments, this result was interpreted by considering that in the WGS formate associative mechanism the stability of formats species is higher on Zr-rich supports.

Discussion of “Energy Dissipation and Turbulent Production in Weak Hydraulic Jumps” by E. Mignot and R. Cienfuegos Romagnoli, Martín; Garcia Rodriguez, Carlos Marcelo; Lopardo, Raúl Antonio The authors reported experimental results on the spatial evolution of turbulent kinetic energy and turbulence production in free weak hydraulic jumps. They performed turbulence measurements using two different 16 MHz SonTek/YSI microacoustic Doppler velocimeters (ADVs) on hydraulic jumps for inflow Froude numbers (F1) of 1.3, 1.9, and 2 [F1 ¼ U1=ðz1gÞ0:5, where U1 = inflow mean velocity; z1 = supercritical depth; and g = gravitational acceleration]. Herein the discussers aim to complement the authors’ analysis by using a new independent data set and by arguing both the bias on the estimated values of turbulent kinetic energy because of the effects of the ADV sampling strategy and the uncertainty on the experimental determination of the turbulence production term.

Del archivo al anaquel. Las consuetas de las catedrales y capillas especiales Martinez, Ana Maria La consueta, como tipo documental y como norma canónica, ha sido un tema poco abordado como objeto de estudio particular. Al introducirnos en su mundo conocemos que fueron documentos manuscritos -que por lo general se hallan en archivos eclesiásticos- pero que podían llegar a imprimirse y constituir un libro de biblioteca, a semejanza de los textos de los Sínodos Provinciales o los Aranceles Eclesiásticos. Esa reproducción los convirtió en ejemplares múltiples, de más fácil ubicación que su propio original, quedando otros, muchas veces ocultos y dispersos, sin que llegaran a ser publicados.

Genomic analysis of the necrotrophic fungal pathogens Sclerotinia sclerotiorum and Botrytis cinerea Ten Have, Arjen; Amselem, Joelle; Cuomo, Christina A.; Jan, A. L. van Kan; Viaud, Muriel; Benito, Ernesto P.; Couloux, Arnaud; Coutinho, Pedro M.; Vries, Ronald P. de; Dyer, Paul S.; Fillinger, Sabine; Fournier, Elisabeth; Gout, Lilian; Hahn, Matthias; Kohn, Linda; Lapalu, Nicolas; Plummer, Kim M.; Pradier, Jean-Marc; Quévillon, Emmanuel; Sharon, Amir; Simon, Adeline; Tudzynski, Bettina; Tudzynski, Paul; Wincker, Patrick; Andrew, Marion; Anthouard, Véronique; Beever, Ross E.; Beffa, Rolland; Benoit, Isabelle ; Bouzid, Ourdia Sclerotinia sclerotiorum and Botrytis cinerea are closely related necrotrophic plant pathogenic fungi notable for their wide host ranges and environmental persistence. These attributes have made these species models for understanding the complexity of necrotrophic, broad host-range pathogenicity. Despite their similarities, the two species differ in mating behaviour and the ability to produce asexual spores. We have sequenced the genomes of one strain of S. sclerotiorum and two strains of B. cinerea. The comparative analysis of these genomes relative to one another and to other sequenced fungal genomes is provided here. Their 38–39 Mb genomes include 11,860–14,270 predicted genes, which share 83% amino acid identity on average between the two species. We have mapped the S. sclerotiorum assembly to 16 chromosomes and found large-scale co-linearity with the B. cinerea genomes. Seven percent of the S. sclerotiorum genome comprises transposable elements compared to <1% of B. cinerea. The arsenal of genes associated with necrotrophic processes is similar between the species, including genes involved in plant cell wall degradation and oxalic acid production. Analysis of secondary metabolism gene clusters revealed an expansion in number and diversity of B. cinerea–specific secondary metabolites relative to S. sclerotiorum. The potential diversity in secondary metabolism might be involved in adaptation to specific ecological niches. Comparative genome analysis revealed the basis of differing sexual mating compatibility systems between S. sclerotiorum and B. cinerea. The organization of the mating-type loci differs, and their structures provide evidence for the evolution of heterothallism from homothallism. These data shed light on the evolutionary and mechanistic bases of the genetically complex traits of necrotrophic pathogenicity and sexual mating. This resource should facilitate the functional studies designed to better understand what makes these fungi such successful and persistent pathogens of agronomic crops.

PRONTO: An ontology for comprehensive and consistent representation of product information Vegetti, Maria Marcela; Leone, Horacio Pascual; Henning, Gabriela Patricia Nowadays, it is quite common for collaborating organizations (or even different areas within a company) to develop and maintain their own product model. This situation leads to information duplication and its associated problems. Besides, traditional product models do not properly handle the high number of variants managed in today competitive markets. In addition, there is a need for an integrated product model to be shared by all the organizations participating in global supply chains (SCs) or all the areas within a company. One way to reach an intelligent integration among product models is by means of an ontology. PRoduct ONTOlogy (PRONTO) is an ontology for the product modeling domain, able to efficiently handle product variants. It defines and integrates two hierarchies to represent product information: the abstraction hierarchy (AH) and the structural one (SH). This contribution presents a ConceptBase formal specification of PRONTO that focuses on the structural hierarchy of products. This hierarchy is a tool to handle product information associated with the multiple available recipes or processes to manufacture a particular product or a set of similar products. The formal specification presented in the paper also includes mechanisms to infer structural information from the explicit knowledge represented at each of the AH levels: Family, VariantSet and Product. This proposal efficiently handles a great number of variants and allows representing product information with distinct granularity degrees, which is a requirement for planning activities taking place at different time horizons. PRONTO easily manages crucial features that should be taken into account in a product representation, such as the efficient handling of product families and variants concepts, composition and decomposition structures and the possibility of specifying constraints. To demonstrate the semantic expressiveness of the proposed ontology a food industry related case-study is addressed and discussed in detail.

Extended-spectrum β-lactamases and plasmid-mediated quinolone resistance in enterobacterial clinical isolates in the paediatric hospital of Uruguay García Fulgueiras, Virginia; Bado, Inés; Mota, María Inés; Robino, Luciana; Cordeiro, Nicolás F.; Varela, Adriana; Algorta, Gabriela; Gutkind, Gabriel Osvaldo; Ayala, Juan A.; Vignoli, Rafael Objectives To analyse the prevalence of resistance to β-lactams and plasmid-mediated quinolone resistance in Enterobacteriaceae in the paediatric hospital of Uruguay. Methods A total of 368 enterobacterial isolates collected between 1 May and 30 November 2009 were studied for the presence of extended-spectrum β-lactamases (ESBLs), qnr alleles and aac(6′)Ib by phenotypic and molecular methods. The genomic context and transferability of β-lactamase and qnr genes were examined by PCR and conjugation, respectively. Results The proportion of inpatients having an infection caused by ESBL-producing enterobacteria was 0.23% (16/7073) in paediatrics wards, 0.64‰ (3/4696) in the neonatology department and 0.03‰ (1/32 557) in the emergency department. ESBL-carrying enterobacteria constituted a total of 21.6% (16/74), 13% (3/23) and 0.37% (1/271) when samples were obtained from paediatrics wards, the neonatology department and the emergency department, respectively. Overall, CTX-M-2 (n = 7), CTX-M-9 (n = 3), CTX-M-8 (n = 2), CTX-M-15 (n = 1), SHV-5 (n = 5) and SHV-2 (n = 2) β-lactamases were detected. Thirteen out of 20 ESBL-producing isolates also carried the aac(6′)Ib gene, and the cr variant was detected in one of them. qnr alleles were detected in four isolates comprising two qnrA1 genes, a qnrB8-like variant and a new qnrB gene showing 26 amino acid differences from QnrB1. Conclusions The proportion of ESBL-producing enterobacteria in Uruguay's paediatric hospital during the study period was 2.3 per 1000 hospitalized patients. The number of different microorganisms detected, as well as the various EBSLs, suggests the occurrence of sporadic episodes instead of nosocomial outbreaks. Nevertheless, the presence of new resistance genes reinforces the necessity for permanent surveillance programmes.

Striatal signaling in L-DOPA-induced dyskinesia: common mechanisms with drug abuse and long term memory involving D1 dopamine receptor stimulation Murer, Mario Gustavo; Moratalla, Rosario Parkinson's disease is a common neurodegenerative disorder caused by the degeneration of midbrain substantia nigra dopaminergic neurons that project to the striatum. Despite extensive investigation aimed at finding new therapeutic approaches, the dopamine precursor molecule, 3,4-dihydroxyphenyl-l-alanine (l-DOPA), remains the most effective and commonly used treatment. However, chronic treatment and disease progression lead to changes in the brain's response to l-DOPA, resulting in decreased therapeutic effect and the appearance of dyskinesias. l-DOPA-induced dyskinesia (LID) interferes significantly with normal motor activity and persists unless l-DOPA dosages are reduced to below therapeutic levels. Thus, controlling LID is one of the major challenges in Parkinson's disease therapy. LID is the result of intermittent stimulation of supersensitive D1 dopamine receptors located in the very severely denervated striatal neurons. Through increased coupling to Gα(olf), resulting in greater stimulation of adenylyl-cyclase, D1 receptors phosphorylate DARPP-32, and other protein kinase A targets. Moreover, D1 receptor stimulation activates extracellular signal-regulated kinase and triggers a signaling pathway involving mammalian target for rapamycin and modifications of histones that results in changes in translation, chromatin modification, and gene transcription. In turn, sensitization of D1 receptor signaling causes a widespread increase in the metabolic response to D1 agonists and changes in the activity of basal ganglia neurons that correlate with the severity of LID. Importantly, different studies suggest that dyskinesias may share mechanisms with drug abuse and long term memory involving D1 receptor activation. Here we review evidence implicating D1 receptor signaling in the genesis of LID, analyze mechanisms that may translate enhanced D1 signaling into dyskinetic movements, and discuss the possibility that the mechanisms underlying LID are not unique to the Parkinson's disease brain.

Low-Complexity Channel Prediction Using Approximated Recursive DCT Schmidt, Jorge Friedrich; Cousseau, Juan Edmundo; Wichman, Risto Ilari; Werner, Stefan We present a novel channel estimator/predictor for OFDM systems over time-varying channels using a recursive formulation of a basis expansion model (BEM) based on an approximated discrete cosine transform (DCT). We derive a recursive implementation of the approximated DCT-BEM for tracking time-varying channels based on a filter bank. The recursive approximated DCT-BEM structure is then used for long range channel prediction by proper scaling and time extrapolation of the filter bank. As the implicit BEM is time invariant we further simplify the implementation by employing a steady-state Kalman filter whose overall complexity is comparable to an LMS algorithm. The derived predictor outperforms, in terms of predictor range, previously proposed long range predictors that are based on autoregressive (AR) modeling of the time-varying channel. For a similar performance, in terms of MSE, the computational complexity of the proposed predictor is significantly lower than conventional sum-of-sinusoids (SOS) channel predictors as no channel delays nor Doppler frequencies need to be estimated.

Different evolutionary histories in two sympatric limpets of the genus Nacella (Patellogastropoda) in the South-western Atlantic coast de Aranzamendi, Maria Carla; Bastida, Ricardo Oscar; Gardenal, Cristina Noemi The phylogeography of two sympatric Magellanic limpets of the genus Nacella was studied. The historical and contemporary processes underlying their intraspecific patterns in Argentina were inferred using the mitochondrial cytochrome oxidase I gene. Results indicate different evolutionary histories in the two species. A recent geographic and demographic expansion *11,000 years ago, with absence of current genetic structuring, is proposed for Nacella magellanica. In contrast, the phylogeographic pattern showed noticeable phylogenetic and geographic discontinuities in Nacella deaurata; slow continuous population size growth with current low levels of gene flow among its populations was also observed, indicating demographic equilibrium. The beginning of divergence between these closely related limpets was estimated at about 270,000 years ago with very little or none gene flow occurring after their splitting. These contrasting historic patterns could be related to distinctive responses to climate changes associated with Pleistocene glaciations, as a result of differences in their ecological traits.

Arqueología de los túneles de Palermo: El edificio del Departamento de Monumentos y Obras de artes (M.O.A.) Schavelzon Chavin, Daniel Gaston Para construir la primera Usina Eléctrica de la ciudad se eligió Palermo y sus parques por su sentido romántico y novedoso. La construcción era un gran edificio en una isla artificial, dos galpones y complejas galerías bajo tierra para el agua. Los cambios en la política sobre suministro eléctrico en la ciudad hizo que esta usina quedara fuera de uso, y desde inicios del siglo XX fue siendo abandonada y desapareciendo las instalaciones a la vez que luego cambiando de uso el sitio hasta quedar casi olvidado. Fueron canceladas y selladas sus circulaciones bajo tierra que desde hace años generaban intriga sobre su forma y función. Al abrirlas y explicarlas se encontró una oficina escondida donde se hacían seguramente arreglos del personal municipal no autorizados.; Por seu sentido romântico e inovador, Palermo e seus parques foram eleitos para a construção da primeira Usina Elétrica da cidade. A construção era um grande edifício em uma ilha artificial, com dois galpões e complexas galerias subterrâneas para as águas. Desde o início do século XX começou a ser abandonada devido às mudanças na politica sobre o abastecimento elétrico da cidade, que fez com que essa usina caísse em desuso. Suas instalações foram desaparecendo até a área ser esquecida. Foram canceladas e seladas as circulações subterrâneas que anos antes geravam intrigas sobre sua forma e sua função, ao abri-las e expô-las se encontrou uma oficina escondida, onde possivelmente a equipe municipal não autorizada fazia reparos.; Palermo and his romantic parks was elected as the site to build the first Electric Power Station at Buenos Aires. It was constructed as two main iron structures over an artificial island, with a complete network of tunnels to use the water from a small lake and stream in the neighbors. The system was dismantled at the beginnings of the XXth. Century and the confined underground tunnels open several question on his date and use when we find it in 1985. Now, an extensive study allow us to understand the history of this first Power Station, the use and dates of the tunnels and the find of an unknown underground office, used to non clear purpose by county personnel.

Construcción de una Prueba de Analogias Figurales; Construction of a Figural Analogies Test Blum, Germán Diego; Abal, Facundo Juan Pablo; Galibert, María Silvia; Attorresi, Horacio Felix Se presentan las características psicométricas de una Prueba de Analogías Figurales desde el marco de la Teoría Clásica de Tests. Se construyeron matrices de figuras de 2x2. Se utilizaron las reglas de relación de rotación, traslación, reflejo, distorsión del tamaño, distorsión de la forma, adición y sustracción para la elaboración de reactivos con una regla, dos reglas y tres reglas de relación. Participaron 475 estudiantes de Psicología de la Universidad de Buenos Aires, de los cuales 96 eran varones y 379 mujeres. El análisis de la consistencia interna brinda un índice altamente satisfactorio (α = .91), las correlaciones ítem-test corregidas puntúan todas por encima de .30 y se corrobora la unidimensionalidad de la Prueba por medio del análisis exploratorio. También se detecta una diferencia intergénero significativa en el puntaje total, a favor de los varones (p < .001). Entre otras cuestiones, se discuten las condiciones para graduar la dificultad del ítem y limitaciones potenciales.; This paper presents the psychometric characteristics of a Test of Figural Analogies from the Classical Test Theory perspective. 2x2 figural matrices were constructed. The rules of relation of rotation, displacement, reflection, size distortion, shape distortion, addition and subtraction were implemented to elaborate one rule-based, two rule-based and tree rule-based items. 475 Psychology students from the University of Buenos Aires participated, 96 of whom were males and 379 females. The internal consistency analysis provides a highly satisfactory score (α = .91), all item-test corrected correlations are above .30 and the Test’s unidimensionality was confirmed through the exploratory analysis. Student t test shows a significant between-gender difference in the total score, favouring men (p < .001). Among other issues, conditions for increasing items’ difficulty level are discussed as well as potential limitations.

Sobre la democracia, la agencia y el Estado: Algunas notas a partir de la teorización de Guillermo O’Donnell D'alessandro, Martin Omar El artículo revisa los principales argumentos del último libro del politólogo argentino Guillermo O’Donnell, que condensa gran parte de su trabajo intelectual de los últimos veinte años. O’Donnell propone una teoría de la democracia en la que tienen importancia las condiciones del Estado (particularmente su capacidad de garantizar derechos de manera universal) y la ciudadanía para un desarrollo satisfactorio del régimen democrático. El artículo relaciona estos contenidos con la obra previa de este autor, subdividiendo su trabajo intelectual y destacando algunos conceptos centrales de su pensamiento.; The article looks through the main arguments of the Argentine political scientist Guillermo O’Donnell’s last book, which abridges most of his work in the last twenty years. O’Donnell proposes a democratic theory within which state and citizenry conditions (particularly the state capacities to guarantee universal rights) are important to fulfill a satisfactory development of the democratic regime. The article relates these contents with O’Donnell’s previous work, underlining some central concepts of his whole thought.