Synthesis and characterization of water-soluble dendronized chitosan using newkome-type dendrons Rimondino, Guido Noé; Strumia, Miriam Cristina; Martinelli, Marisa With increasing emphasis on environmental care 7 and use of renewable resources, simple and effective dendroniza- 8 tion processes were performed to obtain chitosan derivatives. We 9 present different alternatives for the modification of chitosan: 10 dendronization with a biocompatible dendron; a quaternization 11 process with an ammonium salt, which confers a permanent 12 positive charge to the polymer; and a combination of method- 13 ologies allowing amphiphilic polymers. This process confers 14 unique multivalent properties to the native chitosan, and further 15 modifications reach multivalent water-soluble polymers. Hence, 16 the most important highlight of this work is the use of renewable 17 natural polymers and the different methodologies applied to nontoxic solvents with low temperatures. The process described in 18 this paper represents a sustainable alternative for obtaining a functionalized material with properties suitable for application in 19 different areas, such as biomedicine or environmental remediation.

Iodine Staining of Escherichia coli Expressing Genes Involved in the Synthesis of Bacterial Glycogen Demonte, Ana M.; Asención Diez, Matías Damián; Guerrero, Sergio Adrian; Ballicora, Miguel A.; Iglesias, Alberto Alvaro The presence of intracellular glycogen can be detected by the following iodine staining technique. Cells with glycogen stain dark brown, whereas in its absence they remain with a pale yellowish color. It is hypothesized that iodine atoms fit into helical coils formed by the α-polyglucan to form a coloured glycogen-iodine complex. Here, we have studied the expression of Streptococcus mutans (S. mutans) genes that control the biosynthesis of this polysaccharide. Thus, we expressed glgC and glgD genes coding for both ADP-Glc pyrophosphorylase subunits in Escherichia coli (E. coli) AC70R1-504 cells to complement the deficient accumulation of glycogen by this strain. In control cells or in those where an inactive protein was expressed, the synthesis of the polysaccharide was undetectable by this iodine staining technique.

Susceptibility of adults of the cerambycid beetle Hedypathes betulinus to the entomopathogenic fungi Beauveria bassiana, Metarhizium anisopliae and Purpureocillium lilacinum Schapovaloff, María Elena; Alves, L. F. A.; Fanti, A. L.; Alzogaray, Raul Adolfo; Lopez Lastra, Claudia Cristina The cerambycid beetle Hedypathes betulinus (Klug) (Coleoptera: Cerambycidae) causes severe damage to yerba mate plants ( Ilex paraguariensis (St. Hilaire) (Aquifoliales: Aquifoliaceae)), which results in large losses of production. In this study, the pathogenicity of entomopathogenic fungi of the species Beauveria bassiana (Balsamo-Crivelli) Vuillemin (Hypocreales: Cordycipitaceae), Metarhizium anisopliae sensu lato (Metschnikoff) Sorokin (Hypocreales: Clavicipitaceae), and Purpureocillium lilacinum (Thom) Luangsa-ard, Hywel-Jones, Houbraken and Samson (Hypocreales: Ophiocordycipitaceae) on yerba mate were evaluated. Fifteen isolates of B. bassiana , two of M. anisopliae , and seven of P. lilacinum on H. betulinus adults were analyzed under laboratory conditions. The raw mortality rate caused by B. bassiana isolates varied from 51.1 to 86.3%, and their LT 50 values varied between 8.7 and 13.6 d. The isolates of M. anisopliae caused 69.6‒81.8% mortality, and their LT 50 values varied between 7.4 and 7.9 d. In contrast, isolates of P. lilacinum were not pathogenic. M. anisopliae and B. bassiana isolates were pathogenic against H. betulinus adults, suggesting that they may be useful in biological control programs for insect pests of yerba mate.

Systematics of the neotropical genus Leptodactylus Fitzinger, 1826 (Anura: Leptodactylidae): phylogeny, the relevance of non-molecular evidence, and species accounts de Sá, Rafael O.; Grant, Taran; Camargo, Arley; Heyer, W. Ronald; Ponssa, María Laura; Stanley, Edward A phylogeny of the species-rich clade of the Neotropical frog genus Leptodactylus sensu stricto is presented on the basis of a total evidence analysis of molecular (mitochondrial and nuclear markers) and non-molecular (adult and larval morphological and behavioral characters) sampled from > 80% of the 75 currently recognized species. Our results support the monophyly of Leptodactylus sensu stricto, with Hydrolaetare placed as its sister group. The reciprocal monophyly of Hydrolaetare and Leptodactylus sensu stricto does not require that we consider Hydrolaetare as either a subgenus or synonym of Leptodactylus sensu lato. We recognize Leptodactylus sensu stricto, Hydrolaetare, Adenomera, and Lithodytes as valid monophyletic genera. Our results generally support the traditionally recognized Leptodactylus species groups, with exceptions involving only a few species that are easily accommodated without proposing new groups or significantly altering contents. The four groups form a pectinate tree, with the Leptodactylus fuscus group diverging first, followed by the L. pentadactylus group, which is sister to the L. latrans and L. melanonotus groups. To evaluate the impact of non-molecular evidence on our results, we compared our total evidence results with results obtained from analyses using only molecular data. Although non-molecular evidence comprised only 3.5% of the total evidence matrix, it had a strong impact on our total evidence results. Only one species group was monophyletic in the molecular-only analysis, and support differed in 86% of the 54 Leptodactylus clades that are shared by the results of the two analyses. Even though no non-molecular evidence was included for Hydrolaetare, exclusion of that data partition resulted in that genus being nested within Leptodactylus, demonstrating that the inclusion of a small amount of non-molecular evidence for a subset of species can alter not only the placement of those species, but also species that were not scored for those data. The evolution of several natural history and reproductive traits is considered in the light of our phylogenic framework. Invasion of rocky outcrops, larval oophagy, and use of underground reproductive chambers are restricted to species of the Leptodactylus fuscus and L. pentadactylus groups. In contrast, larval schooling, larval attendance, and more complex parental care are restricted to the L. latrans and L. melanonotus groups. Construction of foam nests is plesiomorphic in Leptodactylus but their placement varies extensively (e.g., underground chambers, surface of waterbodies, natural or excavated basins). Information on species synonymy, etymology, adult and larval morphology, advertisement call, and geographic distribution is summarized in species accounts for the 30 species of the Leptodactylus fuscus group, 17 species of the L. pentadactylus group, eight species of the L. latrans group, and 17 species of the L. melanonotus group, as well as the three species that are currently unassigned to any species group.; Se presenta una filogenia del género Leptodactylus, un clado neotropical rico en especies, basada en análises combinados de datos moleculares (marcadores nuclear y mitocondriales) y no moleculares (caracteres de la morfología de adultos y larvas así como de comportamiento) se muestrearon > 80% de las 75 especies reconocidas. Los resultados apoyan la monofília de Leptodactylus sensu stricto, con Hydrolaetare como su grupo hermano. La monofília recíproca de Hydrolaetare y Leptodactylus no requiere considerar a Hydrolaetare como un subgénero o sinónimo de Leptodactylus sensu lato. Se reconocen Leptodactylus sensu stricto, Hydrolaetare, Adenomera y Lithodytes como géneros monofiléticos válidos. Los resultados en general resuelven los grupos tradicionalmente reconocidos de Leptodactylus, con excepciones de algunas especies que son reasignadas sin la necesidad de proponer nuevos grupos o alterar significativamente el contenido de los grupos tradicionales. Los cuatro grupos de especies forman una topología pectinada donde el grupo de L. fuscus tiene una posición basal, seguido por el grupo de L. pentadactylus que es el grupo hermano al clado formado por los grupo de L. latrans y L. melanonotus. Se estimó el impacto de los datos no moleculares en los resultados, comparándose los resultados de evidencia total con los de los análises de datos moleculares solamente. Los datos no moleculares representan un 3.5% de la matriz de evidencia total, pero estos datos tuvieron un impacto significativo en los resultados del análisis de evidencia total. En el análisis estrictamente molecular solamente un grupo de especies resultó monofilético, y el apoyo difirió en 86% de los 54 clados de Leptodactylus compartidos entre los dos análises. A pesar que datos no moleculares no fueron incluídos para Hydrolaetare, la exclusión de evidencia no molecular resultó en el género estar dentro de Leptodactylus, demostrando que la inclusión de evidencia no molecular pequeña para un subgrupo de especies altera no solamente la posición topológica de esas especies, sino tambien de las especies para las cuales dichos datos no fueron codificados. La evolución de patrones de historia natural y reprodución se evalúan en el contexto filogenético. La invasión de afloramientos rocosos y la construción de cámaras de reprodución subterraneas está limitada a los grupos de Leptodactylus fuscus y L. pentadactylus, mientras que la oofagia larval está restringida al grupo de L. pentadactylus. Por otro lado, los cárdumenes larvales, la proteción del cárdumen, y otros comportamientos parentales complejos carecterizan al clado formado por los grupos de especies de L. latrans y L. melanonotus. Los resú- menes de especies incluyen información de sinonímias, etimología, morfología de adultos y larvas, cantos, y distribución geográfica para las 30 especies del grupo de Leptodactylus fuscus, 17 especies del grupo L. pentadactylus, ocho especies del grupo de L. latrans, 17 especies del grupo de L. melanonotus, así como para las tres especies que actualmente no se encuentran asociadas a ninguno de los grupos de especies.

Dimensional stability of materials based on Portland cement at the early stages Mesa Yandy, Angelica Maria; Zerbino, Raul Luis; Giaccio, Graciela M.; Russo, Nélida Araceli; Duchowicz, Ricardo In this work two fiber optic sensing techniques are used to study the dimensional stability in fresh state of different cementitious materials. A conventional Portland cement mortar and two commercial grouts were selected. The measurements were performed by using a Bragg grating embedded in the material and a non-contact Fizeau interferometer. The first technique was applied in a horizontal sample scheme, and the second one, by using a vertical configuration. In addition, a mechanical length comparator was used in the first case in order to compare the results. The evolution with time of the dimensional changes of the samples and the analysis of the observed behavior are included. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

Stabilizing selection on nectar concentration in wild Petunia axillaris, as revealed by genetic analysis of pollen dispersal Gleiser, Gabriela Laura; Internicola, Antonina I.; Austerlitz, Frédéric; Bernasconi, Giorgina Most animal-pollinated plants produce nectar as a pollinator reward. Despite the main role that nectar plays in plant-pollinator interactions, the impact of natural variation in nectar traits on realized male fitness is poorly known. Here, we assessed this relation for a wild Petunia axillaris population using paternity-based direct selection gradient analysis, which allowed us also to infer pollen dispersal patterns. Because male fecundity may depend on other traits which could be associated with nectar characteristics (i.e. volume and concentration), we also considered selection on other key reproductive traits. The analysis revealed that P. axillaris was a strict outcrosser, but that successful pollination occurred mainly among neighbours. Individual plants varied greatly in their male fecundity. Nectar concentration, a key feature of nectar that determines its profitability, was subjected to stabilizing selection. Selection through male function also affected corolla area (positive directional selection), corolla tube length (negative directional selection), and floral display size (stabilizing selection), but none of these traits were phenotypically correlated with nectar characteristics. Because nectar concentration affects the ability and foraging efficiency of different flower visitors to feed on nectar, stabilizing selection may reflect either the preference of the most effective pollinators, or antagonistic selection driven by pollinators and non-pollinating nectar consumers.

Bioactivity of leucite containing glass-ceramics using natural raw materials Stábile, Franco Matías; Volzone, Cristina Glass compositions were carefully prepared, using natural quartz and potassium feldspar as a part of the starting raw materials. The solids were prepared so as to have theoretical stoichiometric leucite and 45S5 Bioglass in different L/Bg weight ratios between 0.43-1.00. Novel bioactive glass-ceramics, containing leucite, sodium calcium silicate and silicorhenanite, confirmed by XRD and FTIR, were obtained. Bioactivity tests were carried out on powdered and sintered disks forms. The immersion time was up to 25 days. Apatite formation on powders was studied by FTIR, and XRD and SEM were used to study bioactivity on disks. The materials developed an apatite layer on their surfaces within 6 days of immersion in simulated body fluid. The glass-ceramic with L/Bg ratio= 0.43 presented an apatite layer on all its surface, not so for the samples with 0.66 and 1.00 ratios, on which such layer was peeled off in most part of their surfaces.

Experimental and DFT study on the indiummediated synthesis of benzophenones via arylstannanes Lo Fiego, Marcos Jacinto; Dorn, Viviana B.; Badajoz, Mercedes A.; Lockhart, Maria T.; Chopa, Alicia B. Experimental results of the solvent-free, indium-promoted reaction of aroyl chlorides with arylstannanes showed a narrow scope; its efficiency depends both on the extent of methylation in the latter and on the nature, number and position of the substituents in the former. With the purpose of explaining experimental results, a theoretical analysis with DFT methods was performed for a set of selected cases.

Conflict and Violence in Times of Crisis: Salta (Argentina) in the Early Decades of the 19th Century; Conflicto y violencia en tiempos de crisis. Salta (Argentina) en las primeras décadas del siglo XIX Mata, Sara Emilia Following the death of Martín Miguel de Güemes in June 1821 and the signing of an armistice between the royalist forces led by Antonio de Olañeta and the members of the elite opposing Güemes, a process of extreme conflict began in the Province of Salta, whose main players were the men mobilized in the region in the protracted struggle against the royalist forces from 1814 onwards. Those difficult years will be analyzed from a double perspective that addresses both the political and power relations with Buenos Aires and the neighboring provinces and states, and the motivations of the subaltern sectors and political aspirations of the political leaders who acted as intermediaries for the power relations between themselves and the Salta elite.

Pollution, habitat loss, fishing and climate change as critical threats to penguins Trathan, Phil N.; Garcia Borboroglu, Jorge Pablo; Boersma, P. Dee; Bost, Charles André; Crawford, Robert J. M.; Crossin, Glenn T.; Cuthbert, Richard; Dann, Peter; Davis, Lloyd Spencer; de la Puente, Santiago; Ellenberg, Ursula; Lynch, Heather J.; Mattern, Thomas; Pütz, Klemens; Seddon, Philip J.; Trivelpiece, Wayne; Wienecke, Bárbara Cumulative human impacts across the world’s oceans are considerable. We therefore examined a single model taxonomic group, the penguins (Spheniscidae), to explore how marine species and communities might be at risk of decline or extinction in the southern hemisphere. We sought to determine the most important threats to penguins and to suggest means to mitigate these threats. Our review has relevance to other taxonomic groups in the southern hemisphere and in northern latitudes, where human impacts are greater. Our review was based on an expert assessment and literature review of all 18 penguin species; 49 scientists contributed to the process. For each penguin species, we considered their range and distribution, population trends, and main anthropogenic threats over the past approximately 250 years. These threats were harvesting adults for oil, skin, and feathers and as bait for crab and rock lobster fisheries; harvesting of eggs; terrestrial habitat degradation; marine pollution; fisheries bycatch and resource competition; environmental variability and climate change; and toxic algal poisoning and disease. Habitat loss, pollution, and fishing, all factors humans can readily mitigate, remain the primary threats for penguin species. Their future resilience to further climate change impacts will almost certainly depend on addressing current threats to existing habitat degradation on land and at sea. We suggest protection of breeding habitat, linked to the designation of appropriately scaled marine reserves, including in the High Seas, will be critical for the future conservation of penguins. However, large-scale conservation zones are not always practical or politically feasible and other ecosystem-based management methods that include spatial zoning, bycatch mitigation, and robust harvest control must be developed to maintain marine biodiversity and ensure that ecosystem functioning is maintained across a variety of scales.; Los impactos humanos acumulativos a lo largo de los océanos del planeta son considerables. Por eso examinamos un solo modelo de grupo taxonómico, los pingüinos (Sphenischidae), para explorar cómo las especies y las comunidades marinas pueden estar en riesgo de disminuir o de extinguirse en el hemisferio sur. Buscamos determinar la amenaza más importante para los pingüinos y sugerir métodos para mitigar estas amenazas. Nuestra revisión tiene relevancia para otros grupos taxonómicos en el hemisferio sur y en las latitudes norteñas, donde los impactos humanos son mayores. Nuestra revisión se basó en una evaluación experta y una revisión de literaratura de las 18 especies de pingüinos; 49 científicos contribuyeron al proceso. Para cada especie de pingüino, consideramos su rango y distribución, tendencias poblacionales y las principales amenazas antropogénicas en aproximadamente los últimos 250 años. Estas amenazas fueron la captura de adultos para obtener aceite, piel y plumas y el uso como carnada para la pesca de cangrejos y langostas: la recolección de huevos; la degradación del hábitat terrestre; la contaminación marina; la pesca accesoria y la competencia por recursos; la variabilidad ambiental y el cambio climático; y el envenenamiento por algas tóxicas y enfermedades. La pérdida de hábitat, la contaminación y la pesca, todos factores que los humanos pueden mitigar, siguen siendo las amenazas principales para las especies de pingüinos. Su resiliencia futura a más impactos por cambio climático dependerá certeramente de que nos enfoquemos en las amenazas actuales a la degradación de hábitats existentes en tierra y en el mar. Sugerimos que la protección de hábitats de reproducción, en conjunto con la designación de reservas marinas de escala apropiada, incluyendo alta mar, será crítica para la conservación futura de los pingüinos. Sin embargo, las zonas de conservación a gran escala no son siempre prácticas o políticamente viables, y otros métodos de manejo basados en ecosistemas que incluyen la zonificación espacial, la mitigación de captura accesoria, y el control fuerte de captura deben desarrollarse para mantener la biodiversidad marina y asegurar que el funcionamiento de los ecosistemas se mantenga a lo largo de una variedad de escalas.

El placer en Poggio Bracciolini; Pleasure in Poggio Bracciolini’s work Ciordia, Martin Jose Raul Kristeller, Garin, Fubini, Goodhart Gordan, Sozzi, Harth y, más recientemente, Montalto, Canfora y Greenblatt –por nombrar sólo algunos autores- han estudiado la obra de Poggio Bracciolini desde diversos puntos de vista. Sin embargo, sus producciones no han recibido la misma atención que las de otros humanistas del Renacimiento, y queda todavía mucho por explorar en ellas. En este texto, se analizan algunas obras de Poggio con el objetivo de estudiar el placer como prá/ica cultural.; K risteller, Garin, Fubini, Goodhart Gordan, Sozzi, Harth and, more recently, Montalto, Canfora and Greenblatt -to name just a few specialists-, have studied Poggio Bracciolini’s work from different points of view. Yet it has not received the attention that other Renaissance humanists have, and there’s still a lot to deal with in his work. In this presentation, the author analyzes some of Poggio’s works with the aim of studying the pleasure as cultural pra*ice.

Bacteriocinogenic Lactic Acid Bacteria of Caprine Products from Chaco-Argentina Rivas, Franco Paolo; Castro, Marcela Paola; Cayré, María E.; Campos, Carmen Adriana The microbiota of artisanal caprine products is essential for the manufacture of fermented products, such as cheeses and dry sausages, conferring them particular and distinctive flavors and generating high value-added products. Many of the bacteria comprising this microbiota are able to produce bacteriocins and antimicrobial substances. The finding of bacteriocinogenic strains within this microbiota could be the first step to introduce biopreservation into these products. Hence, ten lactic acid bacteria (LAB) (6 Lactobacillus paracasei, 2 Lactococcus lactis, 1 Leuconostoc mesenteroides and 1 Lactobacillus rhamnosus) isolated from artisanal caprine products from Chaco (Argentina) were screened for antagonistic activity against other LAB and some spoilage and pathogenic microorganisms, such as Listeria innocua (in lieu of Listeria monocytogenes), Staphylococcus aureus and Escherichia coli. The final goal was to investigate LAB antibacterial activity within this unexplored ecological niche and to select interesting strains for the role of bio-preservatives. Bacteriocin-like substances (BLIS) produced by the isolated strains inhibited three species of S.aureus, L. innocua and Brochothrix thermosphacta. Titles of these antibacterial substances were within the range 100- 200 AU.mL-1. BLIS produced by the isolated strains were heat stable and effective after refrigerated storage and freeze/thaw cycles. Moreover, BLIS activity was higher at acidic pH values, showing a decrease when these values were closer to neutrality or they become alkaline. BLIS did not adsorb to the producer cells which is expected for future production and application on food systems. The results presented in this study could contribute to characterize the antimicrobial activity of the indigenous flora of artisanal caprine products manufactured in the province of Chaco,Argentina. The isolated bacteriocinogenic strains showed a regular production of BLIS in culture broth, which offers promising applications for the biopreservation of these products.

Discussion of “Dynamic treatment regimes: Technical challenges and applications” Robins, James; Rotnitzky, Andrea Gloria We thank the editor for organizing this discussion of the article by Laber et al. (2014) (throughout referred to as LLQPM). The authors offer an elegant solution to the inferential problem caused by nonregularity. Our discussion will to a large extent focus on conceptual rather than technical issues, in part because the authors handled the technical matters so decisively and well. In so doing, we recognize that discussion of conceptual issues was not the authors’ goal and that the authors have written elsewhere about many of the issues we raise. Indeed, in our own writing, we have often either ignored the issues we raise or were unable to offer coherent solutions to them. We hope our discussion makes for an interesting and lively interchange.

Morfological indicators of initial reproductive commitment in Mustelus schmitti (Chondrichthyes, Triakidae): folliculogenesis and ovarian structure along the life cycle; Indicadores morfológicos de compromisso reprodutivo inicial em Mustelus schmitti (Springer 1939) (Chondrichthyes, Triakidae): folliculogenesis e estrutura ovariana ao longo do ciclo de vida Galíndez, Elena Juana; Díaz Andrade, María Constanza; Estecondo, Silvia This work provides information about the sexual commitment and the folliculogenesis of the gatuzo, Mustelus schmitti. A total of 112 females of all maturity stages were fished in the Bahía Blanca estuary, between 2009 and 2010. The oogonia were present all along the life cycle of the animals. The folliculogenesis follows a pattern similar to other elasmobranchs. The granulosa layer keeps monolayered throughout the folliculogenesis, but with two cell types in the vitellogenic follicle. The zona pellucida forms in the primordial follicles. The thecal system shows a connective inner layer and a glandular outer sheath. The microscopic beginning of the sexual commitment, indicated by the vitello hoarding, takes place in follicles from 500 micrometers, while the macroscopic evidence appears in follicles of 2500-3000 micrometers. The results presented in this study suggest that the fishery pressure may affect a susceptible range of sizes of the species, not previously considered and provides a biological framework for the development of fisheries police.; Este trabalho provê informações sobre o compromisso sexual e da foliculogênese do gatuzo, Mustelus schmitti. Um total de 112 fêmeas de todas as fases de maturidade foram pescados no estuário Bahía Blanca, entre 2009 e 2010. O oogônias foi presentes durante todo do ciclo de vida dos animais. A foliculogênese segue um padrão semelhante a outros elasmobrânquios. A capa granulosa mantém-se simples durante toda a foliculogénese, mas com dois tipos de células no folículo vitelogênico. A zona pelúcida forma-se nos folículos primordiais. O sistema mostra uma capa tecal interior de tecido conjuntivo e uma bainha exterior glandular. O início microscópico do compromisso sexual, indicado pela acumulação do vitello, realiza-se em folículos de 500 micrómetros, enquanto que a evidência macroscópica aparece em folículos de 2500-3000 micrómetros. Os resultados apresentados neste estudo sugerem que a pressão da pesca pode afetar um amplo intervalo de tamanho das espécies não considerado anteriormente, e fornece uma base biológica para o desenvolvimento de política comum da pesca.

Informational efficiency in distressed markets: The case of European corporate bonds Fernández, Aurelio; Guercio, María Belén; Martinez, Lisana Belén This paper investigates the effect of the 2008 financial crisis on informational efficiency by carrying out a long-memory analysis of European corporate bond markets. We compute the Hurst exponent for fifteen sectorial indices to scrutinise the time-varying behaviour of long-range memory, applying a shuffling technique to avoid short-term correlation. We find that the financial crisis has uneven effects on the informational efficiency of all corporate bond sectors, especially those related to financial services. However, their vulnerability is not homogeneous and some nonfinancial sectors suffer only a transitory effect.

"Buenos Aires beat": A topography of rock culture in Buenos Aires, 1965-1970 Sanchez Trolliet, Ana Belen In this article, I examine the rise of 'countercultural rock' in the city of Buenos Aires between 1965 and 1970. Through the identification, mapping and analysis of real and imaginary spaces, I analyse how rock occupied the city both materially and symbolically. This dual approach to the study of the production, circulation and consumption of rock music enables us to understand a paradox which spanned those formative years: although it was postulated as the genre of modern Buenos Aires, its aesthetic was geared towards constructing an anti-urban account that favoured escape towards idealized natural environments.

Geometric Interpretation of a Non-linear Beam Finite Element on the Lie Group SE(3) Sonneville, Valentín; Cardona, Alberto; Brüls, Olivier Recently, the authors proposed a geometrically exact beam finite element formulation on the Lie group SE(3). Some important numerical and theoretical aspects leading to a computationally efficient strategy were obtained. For instance, the formulation leads to invariant equilibrium equations under rigid body motions and a locking free element. In this paper we discuss some important aspects of this formulation. The invariance property of the equilibrium equations under rigid body motions is discussed and brought out in simple analytical examples. The discretization method based on the exponential map is recalled and a geometric interpretation is given. Special attention is also dedicated to the consistent interpolation of the velocities.

Specters of Frye Lavagnino, Nicolás Alejo The influence of Northrop Frye’s Anatomy of Criticism in White’s work is evident from the very moment that the reader begins to read the Introduction to Metahistory. Frye appears there as providing a kind of vocabulary for the analysis of historical narratives, focusing on the concept of emplotment. But it can be said that in the face of the plurality of critical theories contained in Frye’s Anatomy, White has proceeded, from Metahistory onwards, in a cautious, even restrictive fashion, generating an artificial division between the vocabulary of ideological implication and that of emplotment. This caution, I argue, has restricted much of the potential and utility of Frye’s critical specters for a historical narratology. The exclusive focus on emplotment in White’s work has an important role, which is to reinforce the distinction between the tropological deep base and the surface strategies of which plots and implications are two of the dimensions surveyed. Yet, as a result of the commitment to the idea of a tropologically informed depth, we get a curious amputation of Frye’s theory of muthos in order to make space for this artificial distinction. But narrativism should not generate these false dilemmas. White’s philosophy of history and Frye’s literary theory tend to converge on a view of language that places it in a continuous social praxis within the variable spectrum of human behavior. It is for this reason that in the end I suggest to adopt the framework of “radical interpretation”, present in the philosophy of language of Donald Davidson, as a way to enrich this perspective and deepen what I call broad muthos theory.

Fichte y Deleuze: potencias y paradojas del afinismo radical Ferreyra, Diego Julián The presence of Fichte's thought in the work of Deleuze is scarce, but nonetheless quiet suggestive, to the extent that in a recent paper Jean-Cristophe Goddard attempts a quest of an extreme affinity between both authors. In this paper I describe, firstly, the main appearances of Fichte in the work of Deleuze, and then I focus, trough the notes that the French philosopher attributes in general to “post-Kantianism”, on a reconstruction of a Deleuzian interpretation of Fichte's ontology, with its merits and flaws. On this basis, I explore the advantages offered by the perspective of affinity, but also the controversial consequences of such a deleuzianisation of the Fichtean legacy.

San José de Flores de pueblo rural a barrio porteño Camino, Ulises Adrián Presentamos una síntesis de los trabajos arqueológicos realizados en el barrio porteño de Flores. Los mismos se vienen desarrollando de forma sistemática desde el año 2003 y han permitido efectuar la tesis doctoral del autor en el año 2012. Se exponen algunos resultados de los distintos sitios excavados y de las fuentes documentales analizadas durante los últimos diez años. Se postula que la ubicación de San José de Flores era estratégica desde el punto de vista geo-económico por su cercanía a Buenos Aires y por encontrarse a la vera del Camino Real. Esta situación espacial habría facilitado la integración del poblado al entramado comercial de la metrópoli y su inclusión dentro del Sistema Mundial.; Este artigo consiste numa síntese das pesquisas arqueológicas realizadas no bairro portenho de Flores, desenvolvidas de forma sistemática desde 2003, e que resultaram na tese de doutorado do autor concluída en 2012. Apresentam-se os resultados obtidos dos vários sítios escavados y das fontes discutidas durante os últimos dez anos. Esta investigação propoe que a localização do povoado de San José de Flores era estratégica, por estar nas proximidades de Buenos Aires e ao lado do Caminho Real, o que lhe permitiu ingressar na rede comercial da metrópole e possibilitando assim a sua inclusão no Sistema-Mundo; This paper is a synthesis of an extended archaeological research carried out in the neighborhood of Flores, Buenos Aires, which has been developing systematically since 2003 and has led to the author’s doctoral thesis completed in 2012. Here are presented the results obtained from excavations in different sites and from documental sources’ analysis, during the past ten years. This investigation suggests that San José de Flores was located strategically, both for its nearness to Buenos Aires and for being beside the Royal Way, all of which enable the village to be integrated into the trade network of the metropolis and therefore into the World System.