La Revista Porteña durante el período 1940-1960 Mauro, Karina Mariel; Libonati, Adriana El artículo realiza una caracterización de la denominada Revista Porteña durante el período 1940-1960. Con este fin, se establecen los rasgos distintivos del género, se examina la trayectoria de los principales capocómicos, vedettes, cantantes, coreógrafos y empresarios con desempeño durante las décadas estudiadas, y se analizan la recepción por parte del público y la crítica, y las relaciones establecidas entre la Revista y el contexto sociopolítico de la época.

Categorías económicas, prácticas sociales y percepciones en el mundo rural castellano (Siglos XIV-XV); Economic categories, social practices and perceptions in the Castillian rural (XIV-XV) Luchía, Corina Julia Las categorías de propiedad, posesión y trabajo en el mundo rural castellano asumen una dimensión práctica que sólo puede comprenderse desde el estudio de las condiciones que el medio natural impone a los agentes. Las percepciones que se reconocen en el ámbito que hemos investigado en los siglos bajomedievales remiten, por lo tanto, a las formas de estructuración de la dinámica de producción que importan la apropiación de los recursos; en particular, la disposición efectiva del principal medio de producción que es la tierra. Sobre esta cuestión en especial, señala E. P. Thompson que el campesino no sentía furiosamente (suponemos) que poseía su tierra, que era suya. Lo que él heredaba era un lugar en la jerarquía de derechos de aprovechamiento. Esa jerarquía de derechos, sobre los que la organización política tendrá una intervención activa para regularlos y garantizar los múltiples intereses que atraviesan el universo de aldeas y de pueblos, se halla sujeta a una lógica de subsistencia que recorre y determina las diversas actividades productivas que sostienen la reproducción de los tributarios; a la vez que posibilitan el mantenimiento de los distintos sectores de poder en el área castellana de realengo en los siglos recortados en esta colaboración.; The categories of ownership, possession and work in rural Castilian take a practical dimension that can only be understood from the study of the natural conditions imposed on agents. The perceptions are recognized in the area that we investigated in the late Medieval period refer, therefore, to ways of structuring the dynamics of production that matter the appropriation of resources, in particular the effective disposal of the principal means of production that is land. On this particular issue, said E. P. Thompson that the peasant "furiously was not (assume) that had their land, which was his. What he inherited was a place in the hierarchy of water rights. "This hierarchy of rights, on which the political will to regulate the active involvement of multiple interests and ensure that cross the universe of villages and towns, is subject to a subsistence logic that runs and determines the various productive activities that support reproduction of the tributaries, while possible to maintain the various branches of power in the Castilian royal area in the centuries cut in this collaboration.

Investigation of the impact of feeding Lactobacillus plantarum CRL 1815 encapsulated in microbially derived polymers on the rat faecal microbiota Jiménez Pranteda, María Luján; Aguilera, Margarita; Mc Cartney, Anne; Hoyles, Lesley; Jiménez-Valera, Maria; Nader, Maria Elena Fatima; Ramos Cormenzana, Alberto; Monteoliva Sánchez, Mercedes AIMS: The aim of this study was to evaluate the impact of the administration of microencapsulated Lactobacillus plantarum CRL 1815 with two combinations of microbially derived polysaccharides, xanthan : gellan gum (1%:0·75%) and jamilan : gellan gum (1%:1%), on the rat faecal microbiota. METHODS AND RESULTS: A 10-day feeding study was performed for each polymer combination in groups of 16 rats fed either with placebo capsules, free or encapsulated Lact. plantarum or water. The composition of the faecal microbiota was analysed by fluorescence in situ hybridization and temporal temperature gradient gel electrophoresis. Degradation of placebo capsules was detected, with increased levels of polysaccharide-degrading bacteria. Xanthan : gellan gum capsules were shown to reduce the Bifidobacterium population and increase the Clostridium histolyticum group levels, but not jamilan : gellan gum capsules. Only after administration of jamilan : gellan gum-probiotic capsules was detected a significant increase in Lactobacillus-Enterococcus group levels compared to controls (capsules and probiotic) as well as two bands were identified as Lact. plantarum in two profiles of ileum samples. CONCLUSIONS: Exopolysaccharides constitute an interesting approach for colon-targeted delivery of probiotics, where jamilan : gellan gum capsules present better biocompatibility and promising results as a probiotic carrier. SIGNIFICANCE AND IMPACT OF STUDY: This study introduces and highlights the importance of biological compatibility in the encapsulating material election, as they can modulate the gut microbiota by themselves, and the use of bacterial exopolysaccharides as a powerful source of new targeted-delivery coating material.

Effect of lyophilization and storage temperature on the activity of salivaricin CRL 1328, a potential bioactive ingredient of a urogenital probiotic product Vera Pingitore, Esteban; Bru Chauve, Elena Magdalena; Nader, Maria Elena Fatima Bacteriocins are antimicrobial peptides with potential applications as therapeutic agents for the treatment of microbial infections. The aim of this work was to investigate the effect of different protectors on the activity of salivaricin CRL1328, a bacteriocin produced by Lactobacillus salivarius CRL1328, during the lyophilization process and subsequent storage at different temperatures for 18 months using statistical models. Different protectors such as mannitol, Tween 80, polyethylene glycol 8000 (PEG), monosodium glutamate (MSG), reconstituted skim milk, sucrose and ascorbic acid were used for the lyophilization and storage of salivaricin. The biplot of principal component analysis was used for the interpretation of the interactions between the different factors studied. The antimicrobial activity of salivaricin was dependent mainly on temperature, and also on the time of storage and protector assayed. The stability of salivaricin was higher at -20°C and 4°C than 25°C and decreased during the time of storage; however, salivaricin was active after 18 months of storage at 25°C. Sucrose, mannitol plus sucrose, PEG plus sucrose and MSG were the most effective agents in protecting the bacteriocin during the lyophilization process. Effective maintenance of the activity of the bacteriocin was observed by storage with sucrose and ascorbic acid at –20°C as well as with PEG plus sucrose at 4°C and –20°C. The results obtained suggest that sucrose alone or combined with PEG can effectively maintain the activity of salivaricin during lyophilization and storage. This study provides useful information for the potential application of salivaricin as a bioactive principle for a pharmaceutical formulation.

Effects of chlorocholine chloride and paclobutrazol on cassava (Manihot esculenta Crantz cv. Rocha) plant growth and tuberous root quality; Efectos del cloruro de cloro colina y el paclobutrazol sobre el crecimiento de plantas y la calidad de raíces tuberosas de mandioca (Manihot esculenta Crantz cv. Rocha) Medina, Ricardo Daniel; Burgos, A.; Difranco, V.; Mroginski, Luis Amado; Cenóz, P. The effects of chlorocholine chloride (CCC) and paclobutrazol (PBZ) foliar application on shoot and root parameters of cassava field-grown plants were studied (0, 45 and 90 mg active ingredient per plant). CCC and PBZ reduced total plant and first branch height, aerial fresh mass and tuberous root number. PBZ delayed branching and significantly decreased tuberous root fresh mass, while CCC caused no modifications in these parameters. In addition, CCC and PBZ treatments did not modify tuberous root diameter, while PBZ reduced tuberous root length significantly. Starch content was increased by both growth regulators at the lower dose, whereas dry matter content was increased only by CCC. In conclusion, CCC suppresses excessive vegetative growth, favours quality attributes and does not alter yield, hence improving harvest index. Although PBZ at a low dose increases the starch content and harvest index, its effects on other parameters are undesirable.

La aparición y declinación del ausentismo como problema para el gobierno de la población trabajadora (Argentina, siglo XX); The emergence and decline of absenteeism as a problem for the government of the working population (Argentine, XX century) Haidar, Victoria En la actualidad, el ausentismo se ha borrado, casi completamente, del vocabulario de las ciencias del trabajo. Sin embargo, esa supresión no se corresponde con lo que sucede en plano de las prácticas del mundo del trabajo ni, tampoco, con las afirmaciones provenientes del discurso político; ámbitos en los que el ausentismo constituye, todavía, un objeto de preocupación. Frente a esas contradicciones, este artículo explora la problematización del ausentismo a lo largo del siglo XX en la Argentina a partir del análisis -en perspectiva histórica- de una serie de discursos. Luego de exhumar las condiciones que, a lo largo del siglo, posibilitaron tanto la aparición del ausentismo como problema, como su declinación, se recuperan las reflexiones e intervenciones que, en el presente, se refieren a él, con la finalidad de mostrar su continuidad y discontinuidad con aquellas estrategias y formas de pensar que, en otros períodos históricos, se movilizaron con la finalidad de gobernar la relación entre asistencia al trabajo, salud y productividad.; Currently, absenteeism has been erased almost entirely from the vocabulary of work science. However, this deletion does not correspond to what happens in the plane of labour's world practices, or, either, with statements from the political discourse; areas where absenteeism is still an object of concern. Faced with these contradictions, this article explores the problematization of absenteeism during the XX century in Argentine, analyzing, from a historical perspective, a series of discourses. After exhuming the conditions that, over the century, made possible both the emergence of absenteeism as a problem, as its decline, it recalls the reflections and interventions that, in the present, referring to absenteeism, in order to show its continuity and discontinuity with those strategies and ways of thinking that in other historical periods, were mobilized in order to govern the relationship between attendance at work, health and productivity.

Understanding the relationship between Mycobacterium bovis spoligotypes from cattle in Latin American Countries Zumárraga, Martín José; Arriaga, C.; Barandiaran, Soledad; Cobos Marín, Laura; de Waard, Jacobus; Estrada García, Inés; Figueiredo, T.; Figueroa, A.; Giménez, F.; Gomes, H. M.; Gonzalez y Merchand, J. A.; Macías, Analía; Milián Suazo, Feliciano; Rodríguez, C. A. R.; Santillán, M. A.; Suffys, P. N.; Trangoni, M. D.; Zárraga, A. M.; Cataldi, Ángel Adrián Spoligotyping is the most frequently used method for genotyping isolates of Mycobacterium bovis worldwide. In the current work, we compared spoligotypes from 1684 M. bovis isolates from Argentina (816), Brazil (412), Chile (66), Mexico (274) and Venezuela (116), obtained from cattle, humans, pigs, wild boars, farmed deer, goats, buffaloes, cats, and wild animals. A total of 269 different spoligotypes were found: 142 (8.4%) isolates presented orphan spoligotypes, whereas 1542 (91.6%) formed 113 different clusters. In cattle, SB0140 was the most representative spoligotype with 355 (24.6%) isolates, followed by SB0121 with 149 (10.3%) isolates. Clustering of spoligotypes ranged from 95.2% in Argentina to 85.3% in Mexico. Orphan spoligotypes were also variable, ranging from 23.7% in Mexico to 4.1% in Brazil. A large proportion of spoligotypes were common to the neighboring countries Argentina, Brazil and Chile. In conclusion, despite the diversity of spoligotypes found in the five countries studied, there are major patterns that predominate in these neighboring countries. These clusters may reflect a long-lasting active transmission of bovine tuberculosis or common historical origins of infection.

Seguridad social latinoamericana: nuevos derechos, nueva economía, ¿nueva democracia? Dvoskin, Nicolás En lo que refiere estrictamente a la seguridad social, el autor considera que el proceso de legitimación es lento, posiblemente mucho más lento que la deslegitimación voraz que provocó el neoliberalismo. Sin embargo, se ha iniciado ese camino en pos de sociedades latinoamericanas en las que la garantía de derechos sociales y derechos humanos sea algo legítimo y, por ende, reclamable. Estima que la nueva seguridad social latinoamericana está dando cuenta de que las privaciones sociales no son sólo responsabilidad de los individuos carentes y sus familias sino, por el contrario, de la sociedad toda, y por ende es ella la que ha de dar respuestas adecuadas. Agrega que si efectivamente se llegara al punto en el que no se cuestionara la legitimidad de estos reclamos, se estaría, ya con mayor convencimiento, hablando de una nueva democracia en América latina.

The Sierra Norte-Ambargasta batholith: Late Ediacaran–Early Cambrian magmatism associated with Pampean transpressional tectonics Iannizzotto, Noelia Flavia; Rapela, Carlos Washington; Baldo, Edgardo Gaspar Agustin; Galindo, Carmen; Fanning, C.M; Pankhurst, Robert J. The Sierra Norte-Ambargasta batholith is one of the largest plutonic expressions of the Pampean orogeny in western Argentina. A thorough petrographic, geochemical, isotopic (Sr and Nd) and geochronological (UePb SHRIMP) study is reported. The batholith comprises granitoid rocks that may be subdivided into those affected by Pampean D2 dextral shearing and mylonization and those emplaced after deformation had ceased; representative samples gave UePb zircon ages of 537 4 Ma and 530 4 Ma respectively. The earlier, dominant, group were derived largely from metaluminous calc-alkaline subduction-related magmas, whereas the late granites are peraluminous. However, all have relatively high initial 87Sr/86Sr ratios (0.706 to at least 0.710, strongly negative εNdt values (1.7 to 5.9) and, in some cases inherited 600 Ma and 970 Ma zircon, similar to the isotopic and zircon provenance seen in the metamorphic host rocks. A high degree of contamination of the magmas, possibly anatexis in the case of the post-mylonite granite, is related to emplacement during the latestage transpressional docking of the Pampean terrane against the Rio de la Plata craton. The absence of detrital zircon derived from the craton in either the Pampean metasedimentary host rocks or the batholith supports this collisional model for the Pampean orogen.

Integrated sliding-mode algorithms in robot tracking applications Gracia, Luis; Garelli, Fabricio; Sala, Antonio An integrated solution based on sliding mode ideas is proposed for robotic trajectory tracking. The proposal includes three sliding-mode algorithms for speed auto-regulation, path conditioning and redundancy resolution in order to fulfill velocity, workspace and C-space constraints, respectively. The proposed method only requires a few program lines and simplifies the robot user interface since it directly deals with the fulfillment of the constraints to find a feasible solution for the robot trajectory tracking in a short computation time. The proposed approach is evaluated in simulation on the freely accessible 6R robot model PUMA-560, for which the main features of the method are illustrated.

QTL for survival to UV-C radiation in Drosophila melanogaster Gomez, Federico Hernan; Loeschcke, Volker; Norry, Fabian Marcelo Purpose: The aim of this study was to investigate tolerance to UV-C (ultraviolet C, 280–100 nm) radiation in Drosophila melanogaster, implementing a quantitative trait locus (QTL) mapping approach. This is of interest to test for genetic variation in survival to UV (ultraviolet) radiation. Materials and methods: We performed a QTL scan in D. melanogaster recombinant inbred lines (RIL) constructed from parental stocks derived from a crossing between northern and southern hemisphere populations that segregated substantial genetic variation in thermal resistance in a previous study. Here, two experimental treatments were implemented: Continuous and cyclic UV-C radiation. Results: Significant QTL were detected on all three major chromosomes. Among these, multiple trait composite interval mapping revealed a significant QTL in the pericentromeric region of chromosome 2, a genome region consistently implicated in thermotolerance in previous studies. Conclusions: This study shows substantial genetic variation for UV-C radiation resistance in D. melanogaster, with QTL for survival to UV-C radiation generally overlapping with major thermotolerance QTL. The genetic architecture of UV-C radiation resistance appears to be more complex in continuously irradiated individuals.

Las sociedades anónimas cruzan los Andes: los inversores chilenos en Neuquén al comenzar el siglo XX Blanco, Graciela El territorio de Neuquén, en el norte de la Patagonia, atrajo la mirada de diversos inversores privados a partir del avance militar que realizó el Estado nacional sobre los grupos indígenas y de la conquista de las tierras del sur argentino; tierras que fueron ofrecidas a particulares en propiedad o arrendamiento en condiciones muy beneficiosas. Este trabajo analiza la conformación en Chile, en los primeros años del siglo XX, de sociedades anónimas que explicitaban como objetivo central la intención de comprar tierras a ambos lados de la Cordillera de los Andes para la explotación agroganadera y la comercialización, y estudia específicamente el origen, itinerario y organización productiva de una de esas sociedades en Neuquén.; Neuquen territory, in the north of the Patagonia, attracted the look of diverse investors after from the military advance that realized the national State on the indigenous groups and of the conquest of the lands of the Argentine's south, lands that were offered to individuals in property or lease in very beneficial conditions. This work analyzes the conformation in Chile, in the first years of the 20th century, of joint-stock companies that stated explicitly as central aim the intention of buying lands on both sides of the Mountain chain of the Andes for the agricultural and livestock exploitation and the commercialization, and there studies specifically the origin, itinerary and productive organization of one of these companies in Neuquen.

Development of a PCR assay to detect the potential production of nivalenol in Fusarium poae Dinolfo, María Inés; Barros, Germán Gustavo; Stenglein, Sebastian Alberto Fusarium species can produce mycotoxins, which can contaminate cereal-based food producing adverse effects for human and animal health. In recent years, the importance of Fusarium poae has increased within the Fusarium head blight complex. Fusarium poae is known to produce trichothecenes, especially nivalenol, a potent mycotoxin able to cause a variety of toxic effects. In this study, a specific primer pair was designed based on the tri7 gene to detect potential nivalenol-producing F. poae isolates. A total of 125 F. poae, four F. cerealis, two F. culmorum, one F. langsethiae, one F. sporotrichioides and seven F. graminearum, plus F. austroamericanum, F. meridionale, F. graminearum sensu stricto and F. cortaderiae from the NRRL collection were analysed, and only F. poae isolates gave a positive result for the presence of a 296-bp partial tri7 DNA fragment. Moreover, the primer set was tested from cereal seed samples where F. poae and other Fusarium species with a negative result for the specific reaction (F. graminearum, F. oxysporum, F. chlamydosporum, F. sporotrichioides, F. equiseti and F. acuminatum) were isolated, and the expected fragment was amplified. We developed a rapid and reliable PCR assay to detect potential nivalenol-producing F. poae isolates.

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

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

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

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

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

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

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