Trabajo y salud en conductores de taxis; Working and health in taxi drivers Ledesma, Ruben Daniel; Poó, Fernando Martín; Úngaro, Jorge; Lopez, Soledad Susana; Cirese, Ana Paula; Enev, Ana; Nucciarone, Maria Isabel; Tosi, Jeremías David La conducción de taxis es una actividad potencialmente insalubre debido a las condiciones laborales que caracterizan la tarea, como la informalidad o la exposición a diferentes fuentes de riesgos para la salud. El objetivo del presente trabajo fue aportar información sobre las condiciones laborales, el estado de salud, los hábitos y las estrategias de afrontamiento de los conductores. En el estudio par ticiparon 421 conductores de taxi. Los datos se obtuvieron por medio de un cuestionario de auto-informe. Se realizaron análisis descriptivos sobre los diferentes aspectos estudiados. Los resultados indicaron que la jornada laboral típica era de 10 o 12 horas, que el riesgo de participar en un siniestro o de ser asaltado durante la jornada laboral era elevado, que los problemas de salud física y emocional más prevalentes eran dolores músculo-esqueléticos, mal humor e irritabilidad, sensación de cansancio y ansiedad, que los hábitos alimenticios eran poco saludables y bajos los niveles de actividad física, y que las estrategias de afrontamiento típicas eran de carácter paliativo e individual. El artículo aporta datos con una población latinoamericana, una región en la que no se ha generado mucha evidencia empírica sobre el problema. Se brindan recomendaciones para posibles intervenciones preventivas.; Taxi driving is a potentially unhealthy activity due to working conditions such as piecework or the exposure to different sources of health risk. Some of the typical problems in the industry have been widely studied (e.g. car crashes) while others have received less attention (e.g. coping strategies). Moreover, most of the research comes from Anglo-Saxon, European or Eastern coutries. Much less is known about the problem in Latin America. The aim of the present paper was to study working conditions and health status in taxi drivers from a Latinamerican country. The study include different aspects of the problem that have been previously studied separately. Participants were 42 taxi drivers, mostly male. A selfadministered questionnaire was used to collect data. Participants gave information about their working conditions, health status, healthy and unhealthy habits, and coping strategies. Results indicated that the typical working day of a taxi driver ranges from 10 to 12 hours; that drivers have an elevated risk of being involved in a car crash or an assault; that the most prevalent physical or emotional problems are musculoskeletal pain, fatigue, bad mood, irritability, anxiety, and sleep disorders; that unhealthy eating habit and low levels of pshysical activity prevail; and that coping strategies are mainly palliative and individual. Finally, some recommendations for the development of preventive actions are given.

Diversidad de Carabidae (Insecta: Coleoptera) en ambientes con distinto uso y grado de disturbio en un agroecosistema del sudeste bonaerense, Argentina Castro, Adela Verónica; Porrini, Darío Pablo; Cicchino, Armando Conrado Los coleópteros de la familia Carabidae conforman gran parte de la biodiversidad de los suelos de los agroecosistemas y por eso son buenos organismos modelo para estudiar la composición y la estructura de las comunidades. Los objetivos de este trabajo fueron: a) analizar la diversidad de Carabidae (riqueza, actividad, composición y estructura del ensamble) en ambientes con distinto uso antrópico; b) conocer la asociación de las especies de Carabidae con la vegetación herbácea; c) analizar la proporción de especies de acuerdo a la cantidad de ambientes que ocupan, su capacidad de dispersión por medio de vuelo y su sinantropía; d) identificar potenciales especies típicas de los distintos ambientes, y e) registrar la presencia de larvas. El estudio se realizó en un agroecosistema de la Laguna Nahuel Rucá (37°37’04’’ S - 57°25’16’’ O). Se seleccionaron distintos ambientes de muestreo: tres ambientes de bosque, tres ambientes abiertos y un ambiente mixto, que fueron muestreados mensualmente mediante trampas "pitfall" a lo largo de un año. Se elaboró un índice para clasificar el grado de modificación antrópica de cada ambiente. Los valores más altos de riqueza se observaron en los ambientes de bosque. Los ensambles de Carabidae se diferenciaron en función de la estructura del hábitat. Se identificaron especies típicas de los ambientes abiertos y de los ambientes de bosque. La proporción de especies macrópteras y sinantrópicas tendió a ser mayor en los ambientes abiertos, mientras que no se encontraron diferencias en la proporción de eurítopas. Diez especies de carábidos se asociaron con las familias Convolvulaceae, Apiaceae y Fabaceae en primavera. Siete especies de larvas se registraron principalmente en ambientes de bosque durante el verano. Se puede concluir que el uso del suelo y la estructura del ambiente influyen sobre la diversidad de carábidos en la escala local.; The coleopteran of the family Carabidae conform a large part of the soil biodiversity from agroecosystems, hence they are good model organism to study the composition and structure of communities. The aims of this contribution were to: a) analyze the diversity of Carabidae (species richness, activity, composition and structure of assemblages) in environments with different anthropic use; b) know the association of Carabidae species with herbaceous vegetation; c) analyze the proportion of species according to their specialisation to habitat requirements, capacity of dispersion in relation to wing dimorphism and sinanthropism, and d) identify typical species of different environments and e) record the presence of larvae. The study was conducted in an agroecosystem from Laguna Nahuel Ruca (37°37’04’’ S - 57°25’16’’ W). We selected different sampling environments: three forest environments, three open environments and a mixed environment; all of them were sampled monthly with “pitfall” traps during one year. We made a ranking to measure the degree of human modification of each environment. Higher values of species richness were recorded in forest environments. Carabidae assemblages differed according to habitat structure. We identify typical species of open environments as well as forest environments. The proportion of macropterous and synanthropic species tended to be higher in open environments, while there was no difference in the proportion of eurytopic species. Ten species of Carabidae were associated with families Convolvulaceae, Apiaceae and Fabaceae in spring. Seven species of larvae were recorded mainly in forest environments during summer. We concluded that land use and the structure of environment influence the local biodiversity of Carabidae.

Conjuntos cerámicos en contextos de interacción. Análisis diacrónico de la alfarería del sitio Los Viscos (Valle del Bolsón, Belén, Catamarca); Ceramic assemblages in interaction contexts. A diachronic analysis of pottery from the Los Viscos site (Valle del Bolsón, Belén, Catamarca) Puente, Veronica Se presentan los resultados de la caracterización estilística y del análisis tecnológico y petrográfico sobre conjuntos cerámicos recuperados en el sitio Los Viscos, valle del Bolsón (Departamento de Belén, Provincia de Catamarca). Se trata un alero que fue reocupado de manera discontinua pero recurrente entre un lapso ca. 1.000 AC - 1.440 DC y fue utilizado como refugio temporal vinculado con actividades de tránsito interregional. Los restos de alfarería que quedaron como resultado de dichas ocupaciones corresponden a los períodos Formativo, Desarrollos Regionales e Hispano Indígena. Se realiza un análisis sincrónico y diacrónico de los mismos con el propósito de contribuir por un lado, al estudio de las prácticas de producción cerámica en el valle y además, brindar evidencia para vincular al sitio con actividades de interacción con diferentes regiones. De este modo, se problematiza la procedencia de las piezas recuperadas y se sugiere una circulación diferencial entre la cerámica fina y la ordinaria que se reproduce a lo largo de la secuencia.; In this article, we present the results obtained from the stylistic analysis, as well as the technological and petrographic study of ceramic recovered from the Los Viscos site, El Bolsón Valley (Belén, Catamarca). The site is a rock-shelter which was occupied discontinuously, yet recurrently between c. 1,000 BC – AD 1,600. The site functioned as a temporary shelter associated to interregional mobility. The ceramics recovered from the various occupation layers’ date to the Formative, Regional Development and Indo-Hispanic period. We undertook, a synchronous and diachronic analysis of the material with the aim of contributing to the study of valley’s ceramic production practices, thereby generating data linking the site with other regions. In this manner, the ceramic provenance was discussed, suggesting that there was differential movement at play between fine and common ceramics throughout the chronological sequence.

Notas para una cartografía oral del cielo entre los tobas del oeste formoseño; Notes pour une cartographie orale du ciel chez les Tobas du nordouest de Formosa; Notes towards an Oral Cartography of the Sky among the Toba of Western Formosa Gomez, Cecilia Paula Se propone un estudio de la visión toba del cielo: los objetos celestes, asterismos y aquellos fenómenos que desde la óptica nativa se relacionan significativamente con el firmamento. Esta interpretación de lo celeste se relaciona a su vez con la cosmología, la mitología y la organización social. Parte fundamental de esta conexión es la diferencia entre los seres celestes masculinos, quienes cumplen con las etapas del ciclo vital, y los femeninos, que parecen cristalizados en una condición inalterable.; Cet article propose une étude de la vision toba du ciel : les objets célestes, les astérismes et les phénomènes qui selon l’optique autochtone sont en relation avec le firmament de façon significative. Cette interprétation du ciel correspond à la cosmologie, la mythologie et l’organisation sociale des Tobas. Une partie fondamentale de cette connexion tient à la différence entre les êtres célestes masculins, qui accomplissent les étapes du cycle vital, et les féminins, qui paraissent cristallisés dans une condition inaltérable.; The purpose of this article is to study the Toba vision of the sky: celestial objects, asterisms, and those phenomena that, from a native perspective, are significantly related to the sky. This interpretation of the celestial abode is also related to their cosmology, mythology, and social organisation. A key part of this connection is the difference between male celestial beings, which fulfil the life-cycle stages, and female celestial beings, which seem to be crystalized in an unchanging condition

Naturaleza y barbarie: Green Mansions (1904) de William Henry Hudson Lencina, Eva Verónica En el marco de una investigación doctoral sobre la obra de W.H. Hudson y su recepción en Argentina, abordaremos en este artículo las representaciones de lo americano y lo exótico en Green Mansions. Asimismo, trazaremos un panorama que repase los principales tópicos y motivos identificados previamente por la crítica especializada, así como diversos sistemas de oposiciones que atraviesan el texto (el discurso colonialista, donde encontramos la clásica dicotomía entre civilización y barbarie, y el discurso propiamente hudsoniano, donde en un nivel más profundo la dicotomía está dada entre el hombre y la naturaleza, por medio de lo cual desarrolla el motivo del anhelo universal por retornar a la Madre Naturaleza).

Sismoestratigrafía y evolución Cenozoica de un sector de las terrazas Nágera y Perito Moreno, Margen Continental Patagónico; Seismostratigraphy and Cenozoic evolution of a sector of the Nágera and Perito Moreno terraces, Patagonian Continental Margin Isola, José Ignacio; Tassone, Alejandro Alberto; Esteban, Federico Damián; Violante, Roberto Antonio; Haller, Miguel Jorge F.; ST Onge, Guillaume El Margen Continental Patagónico (MCP) es, desde un punto de vista geológico, la porción del Margen Continental Argentino Pasivo Volcánico (MCAPV) ubicada al sur de la Zona de la Fractura Colorado. Esta zona del margen se encuentra influenciada desde el límite Eoceno-Oligoceno, por la circulación termohalina de las corrientes de agua profundas generadas en el sector antártico. La erosión y depositación producida por estas corrientes dio origen a la formación de cuatro extensas terrazas contorníticas que cubren una gran parte del MCP. El objetivo de este trabajo es aportar nuevos conocimientos sobre las dos terrazas más occi­dentales, la Terraza Nágera (TN, ~600 a 1000 m de profundidad) y la Terra­za Perito Moreno (TPM, ~1000 a 1500 m de profundidad). En estas terrazas la sismoestratigrafía y los procesos asociados a su evolución no han sido estudiados en forma exhaustiva. Por tal motivo, los trabajos realizados en la zona se refieren a las edades de las unidades sísmicas en forma especulativa o proponen una sola unidad denominada ?post-rift indefinido?.
Tras el análisis integrado de un perfil sísmico de mediana resolución y gran pene­tración, y perfiles sísmicos de alta resolución y baja penetración, se han definido una serie de unidades sísmicas, las cuales fueron correlacionadas con esquemas sismoestratigráficos propuestos previamente para el MCAPV, e infor­mación bioes­tratigráfica publicada. De este modo se presenta en este trabajo un esquemasismo estratigráfico novedoso para la parte más boreal de la TN y la TPM, el cual se acopla de forma armoniosa a los modelos sismoestratigráficos propuestos para el resto del MCAPV. A partir de las unidades sísmicas definidas se proponen cuatro etapas evolutivas para el Cenozoico de la zona de estudio:
1) Desde el Paleoceno al Eoceno-Oligoceno, se caracteriza por una subsidencia principalmente termal y una sedimentación hemipelágica y gravitacional con poca o nula actividad de corrientes oceánicas.
2) Desde el Eoceno-Oligoceno al Mioceno tardío, se caracteriza por la presencia de un ambiente marino somero, con clinoformas que llegan desde la plataforma externa hasta el talud medio y es interpretada como una progradación deltaica asociada a un estadío de nivel de mar bajo.
3) Desde el Mioceno tardío al Plioceno, caracterizada por las primeras evidencias de acción de corrientes oceánicas, seguido de una superficie erosiva y formación de la TN y la TPM.
4) Desde el Plioceno a la actualidad, se caracteriza por alta actividad de las corrientes oceánicas en el talud superior y medio, intensa interacción entre corrientes oceánicas y el lecho marino y desarrollo de depósitos contorníticos.

Sismoestratigrafía y evolución Cenozoica de un sector de las terrazas Nágera y Perito Moreno, Margen Continental Patagónico; Seismostratigraphy and Cenozoic evolution of a sector of the Nágera and Perito Moreno terraces, Patagonian Continental Margin Isola, José Ignacio; Tassone, Alejandro Alberto; Esteban, Federico Damián; Violante, Roberto Antonio; Haller, Miguel Jorge F.; ST Onge, Guillaume El Margen Continental Patagónico (MCP) es, desde un punto de vista geológico, la porción del Margen Continental Argentino Pasivo Volcánico (MCAPV) ubicada al sur de la Zona de la Fractura Colorado. Esta zona del margen se encuentra influenciada desde el límite Eoceno-Oligoceno, por la circulación termohalina de las corrientes de agua profundas generadas en el sector antártico. La erosión y depositación producida por estas corrientes dio origen a la formación de cuatro extensas terrazas contorníticas que cubren una gran parte del MCP. El objetivo de este trabajo es aportar nuevos conocimientos sobre las dos terrazas más occi­dentales, la Terraza Nágera (TN, ~600 a 1000 m de profundidad) y la Terra­za Perito Moreno (TPM, ~1000 a 1500 m de profundidad). En estas terrazas la sismoestratigrafía y los procesos asociados a su evolución no han sido estudiados en forma exhaustiva. Por tal motivo, los trabajos realizados en la zona se refieren a las edades de las unidades sísmicas en forma especulativa o proponen una sola unidad denominada ?post-rift indefinido?.
Tras el análisis integrado de un perfil sísmico de mediana resolución y gran pene­tración, y perfiles sísmicos de alta resolución y baja penetración, se han definido una serie de unidades sísmicas, las cuales fueron correlacionadas con esquemas sismoestratigráficos propuestos previamente para el MCAPV, e infor­mación bioes­tratigráfica publicada. De este modo se presenta en este trabajo un esquemasismo estratigráfico novedoso para la parte más boreal de la TN y la TPM, el cual se acopla de forma armoniosa a los modelos sismoestratigráficos propuestos para el resto del MCAPV. A partir de las unidades sísmicas definidas se proponen cuatro etapas evolutivas para el Cenozoico de la zona de estudio:
1) Desde el Paleoceno al Eoceno-Oligoceno, se caracteriza por una subsidencia principalmente termal y una sedimentación hemipelágica y gravitacional con poca o nula actividad de corrientes oceánicas.
2) Desde el Eoceno-Oligoceno al Mioceno tardío, se caracteriza por la presencia de un ambiente marino somero, con clinoformas que llegan desde la plataforma externa hasta el talud medio y es interpretada como una progradación deltaica asociada a un estadío de nivel de mar bajo.
3) Desde el Mioceno tardío al Plioceno, caracterizada por las primeras evidencias de acción de corrientes oceánicas, seguido de una superficie erosiva y formación de la TN y la TPM.
4) Desde el Plioceno a la actualidad, se caracteriza por alta actividad de las corrientes oceánicas en el talud superior y medio, intensa interacción entre corrientes oceánicas y el lecho marino y desarrollo de depósitos contorníticos.

Stratigraphy, age and correlation of Lepué Tephra: a widespread c. 11 000 cal a BP marker horizon sourced from the Chaitén Sector of southern Chile Alloway, Brent V.; Moreno, Patricio I.; Pearce, Nick J. G.; De Pol Holz, Ricardo; Henríquez, William I.; Pesce, Oscar H.; Sagredo, Esteban; Villarosa, Gustavo; Outes, Ana Valeria We describe the stratigraphy, age and correlation of a prominent tephra marker, named Lepué Tephra, extensively distributed in north-western Patagonia. Lepué Tephra is well dated at c. 11 000 cal a BP from numerous lake and soil cover-bed sequences and its recognition is useful for assessing the rate and timing of deglaciation as well as associated environmental changes in this region during the last glacial termination and early Holocene. Lepué Tephra has attributes typical of a complex and compositionally zoned phreatomagmatic eruptive. While the initial rhyolitic phase can be readily distinguished from multiple eruptive products sourced from the adjacent Volcán Chaitén, the main erupted end member is of basaltic–andesitic bulk composition − similar to younger tephras sourced from Holocene monogenetic cones adjacent to the Volcán Michimahuida massif (tMim). Lepué Tephra can be correlated to an equivalent-aged pyroclastic flow deposit (Amarillo Ignimbrite) prominently distributed in the south-eastern sector of tMim. The source vent for these co-eruptive events is obscured by an extensive ice field and is currently unknown. The widespread radially symmetrical distribution of Lepué Tephra centred on tMim cannot be attributed solely to volcanological considerations. Reduced Southern Hemisphere westerly wind influence interpreted from climate proxies at the time of eruption are also implicated.

Participation of hypothalamic CB1 receptors in reproductive axis disruption during immune challenge Surkin, Pablo Nicolas; Di Rosso, María Emilia; Correa, Fernando Gabriel; Elverdín, Juan Carlos; Genaro, Ana Maria; de Laurentiis, Andrea; Fernández Solari, José Javier Immune challenge inhibits reproductive function and endocannabinoids (eCB) modulate sexual hormones. However, no studies have been performed to assess whether the eCB system mediates the inhibition of hormones that control reproduction as a result of immune system activation during systemic infections. For that reason, we evaluated the participation of the hypothalamic cannabinoid receptor CB1 on the hypothalamic-pituitary-gonadal (HPG) axis activity in rats submitted to immune challenge. Male adult rats were treated i.c.v. administration with a CB1 antagonist/inverse agonist (AM251) (500 ng/5 μL), followed by an i.p. injection of lipopolysaccharide (LPS) (5 mg/kg) 15 minutes later. Plasmatic, hypothalamic and adenohypophyseal pro-inflammatory cytokines, hormones and neuropeptides were assessed 90 or 180 minutes post-LPS. The plasma concentration of tumour necrosis factor α and adenohypophyseal mRNA expression of Tnfα and Il1β increased 90 and 180 minutes post i.p. administration of LPS. However, cytokine mRNA expression in the hypothalamus increased only 180 minutes post-LPS, suggesting an inflammatory delay in this organ. CB1 receptor blockade with AM251 increased LPS inflammatory effects, particularly in the hypothalamus. LPS also inhibited the HPG axis by decreasing gonadotrophin-releasing hormone hypothalamic content and plasma levels of luteinising hormone and testosterone. These disruptor effects were accompanied by decreased hypothalamic Kiss1 mRNA expression and prostaglandin E2 content, as well as by increased gonadotrophin-inhibitory hormone (Rfrp3) mRNA expression. All these disruptive effects were prevented by the presence of AM251. In summary, our results suggest that, in male rats, eCB mediate immune challenge-inhibitory effects on reproductive axis at least partially via hypothalamic CB1 activation. In addition, this receptor also participates in homeostasis recovery by modulating the inflammatory process taking place after LPS administration.

Behavioral effects in room evacuation models Dossetti, V.; Bouzat, Sebastian; Kuperman, Marcelo Nestor In this work we study a model for the evacuation of pedestrians from an enclosure considering a continuous space substrate and discrete time. We analyze the influence of behavioral features that affect the use of the empty space, that can be linked to the attitudes or characters of the pedestrians. We study how the interaction of different behavioral profiles affects the needed time to evacuate completely a room and the occurrence of clogging. We find that neither fully egotistic nor fully cooperative attitudes are optimal from the point of view of the crowd. In contrast, intermediate behaviors provide lower evacuation times. This leads us to identify some phenomena closely analogous to the faster-is-slower effect. The proposed model allows for distinguishing between the role of the attitudes in the search for empty space and the attitudes in the conflicts.

Evolution of multiple quantum coherences with scaled dipolar Hamiltonian Sánchez, Claudia Marina; Buljubasich Gentiletti, Lisandro; Pastawski, Horacio Miguel; Chattah, Ana Karina In this article, we introduce a pulse sequence which allows the monitoring of multiple quantum coherences distribution of correlated spin states developed with scaled dipolar Hamiltonian. The pulse sequence is a modification of our previous Proportionally Refocused Loschmidt echo (PRL echo) with phase increment, in order to verify the accuracy of the weighted coherent quantum dynamics. The experiments were carried out with different scaling factors to analyze the evolution of the total magnetization, the time dependence of the multiple quantum coherence orders, and the development of correlated spins clusters. In all cases, a strong dependence between the evolution rate and the weighting factor is observed. Remarkably, all the curves appeared overlapped in a single trend when plotted against the self-time, a new time scale that includes the scaling factor into the evolution time. In other words, the spin system displayed always the same quantum evolution, slowed down as the scaling factor decreases, confirming the high performance of the new pulse sequence.

Interior Lp-estimates and local Ap-weights Cardoso, Isolda Eugenia; Viola, Pablo Sebastian; Viviani, Beatriz Eleonora Let Ω be a nonempty open proper and connected subset of Rn, n≥3. Consider the elliptic Schrödinger type operator LEu=AEu+Vu=−Σijaij(x)uxixj+Vu in Ω, and the linear parabolic operator LPu=APu+Vu= ut−Σaij(x,t)uxixj+Vu in ΩT=Ω×(0,T), where the coefficients aij∈VMO and the potential V satisfies a reverse Hölder condition. The aim of this paper is to obtain a priori estimates for the operators LE and LP in weighted Sobolev spaces involving the distance to the boundary and weights in a local Ap class.

Site-occupancy modelling: A new approach to assess sensitivity of indicator species Cortelezzi, Agustina; Armendáriz, Laura Cecilia; Simoy, Maria Veronica; Marinelli, Claudia Beatriz; Cepeda, Rosana Esther; Rodrigues Capitulo, Alberto; Berkunsky, Igor One of the most challenging aspects of quality indices has been to compile reliable measures of the species’ sensitivity to various magnitudes and different kinds of ecosystem attributes. Occupancy modelling has become increasingly useful to ecologists because provides a flexible framework to estimate the habitat use as a function of site information. We modelled occupancy of oligochaete species from physicochemical variables of Pampean streams; and we described the change in occupancy along the gradient of each explanatory physicochemical variable. We proposed three phases (resistance, tolerance and extinction) to describe the sensitivity of the species in terms of occupancy. Seventeen of the 33 taxa of oligochaetes were enough abundant to be modeled. In eight species, we obtained a total of 11 different models including physicochemical covariates. Occupancy was explained by conductivity in four species, by dissolved oxygen in three species, and by nutrients in four species. The analysis of phases (resistance, tolerance and extinction) to describe the sensitivity of the species in terms of occupancy, offers a new methodology to understand how the species behave along a stressor gradient. Detailed descriptions of sensitivity of these local species, will helps ecologists to generate more accurate biotic indices.

Solution Polymerization of Methyl Methacrylate in an Ionic Liquid Employing Cyclic Multifunctional Initiators Delgado Rodríguez, Karla; Acuña, Pablo; Enríquez Medrano, Francisco J.; Barreto, Gastón Pablo; Morales, Graciela 1-Butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) was used as a solvent during the methyl methacrylate polymerization, in a temperature range of 110 to 130°C, employing two multifunctional cyclic peroxides as initiators, the pinacolone diperoxide and the diethylketone triperoxide, and results were compared with those obtained in N,N-dimethylformamide (DMF) as a solvent under the same reaction conditions. The polymerization rate was approximately four times faster in [BMIM][BF4] than in DMF, and this behavior is supported by the higher decomposition rate constants calculated for both initiators in pure ionic liquid in comparison with those calculated in DMF. The average molecular weights values were nearly three times lower in DMF than in the ionic liquid, and this is explained by the reduction in the propagation activation energy in the presence of the ionic liquid.

An easy, cheap, and versatile method to trap turtles, with calibrated sampling effort Semeñiuk, María Belén; Alcalde, Leandro; Sanchez, Rocio Maria; Cassano, María Julia A novel method (hookless trot line) to trap freshwater turtles in aquatic environments from the Pampas region on southern South America is presented. Cost, functioning, effectiveness, biases, maintenance, and constraints of the hookless trot line are analyzed compared to three other methods (two variants of funnel traps and a trawl net) commonly used in studies dealing with freshwater turtle ecology. Fieldwork was carried out from 2005-2015 in streams that drain the northeast of Buenos Aires province, Argentina. The beef-baited, single-mouthed funnel trap with drift fences was the method that captured the most turtles. It was closely followed by the hookless trot line, whereas the other two methods obtained a small portion of captures. Nevertheless, we conclude that the best method to trap turtles in the region was the hookless trot line because it adapts to a wide range of environments, does not injure the turtles, is easy to build and transport, requires little maintenance, and its materials are cheaper and more durable than those of the other methods. Further, a calibration for the trot line is provided in order to minimize effort and maximize captures: in cost/benefit terms, the best result was achieved by employing 1 bait/1.5 m of shoreline.

A short FE implementation for a 2d homogeneous Dirichlet problem of a fractional Laplacian Acosta Rodriguez, Gabriel; Mastroberti Bersetche, Francisco Vicente; Borthagaray Peradotto, Juan Pablo In Acosta etal. (2017), a complete n-dimensional finite element analysis of the homogeneous Dirichlet problem associated to a fractional Laplacian was presented. Here we provide a comprehensive and simple 2D MATLAB ® finite element code for such a problem. The code is accompanied with a basic discussion of the theory relevant in the context. The main program is written in about 80 lines and can be easily modified to deal with other kernels as well as with time dependent problems. The present work fills a gap by providing an input for a large number of mathematicians and scientists interested in numerical approximations of solutions of a large variety of problems involving nonlocal phenomena in two-dimensional space.

LigQ: A Webserver to Select and Prepare Ligands for Virtual Screening Radusky, Leandro Gabriel; Ruiz Carmona, Sergio; Modenutti, Carlos Pablo; Barril, Xavier; Turjanski, Adrian; Marti, Marcelo Adrian Virtual screening is a powerful methodology to search for new small molecule inhibitors against a desired molecular target. Usually, it involves evaluating thousands of compounds (derived from large databases) in order to select a set of potential binders that will be tested in the wet-lab. The number of tested compounds is directly proportional to the cost, and thus, the best possible set of ligands is the one with the highest number of true binders, for the smallest possible compound set size. Therefore, methods that are able to trim down large universal data sets enriching them in potential binders are highly appreciated. Here we present LigQ, a free webserver that is able to (i) determine best structure and ligand binding pocket for a desired protein, (ii) find known binders, as well as potential ligands known to bind to similar protein domains, (iii) most importantly, select a small set of commercial compounds enriched in potential binders, and (iv) prepare them for virtual screening. LigQ was tested with several proteins, showing an impressive capacity to retrieve true ligands from large data sets, achieving enrichment factors of over 10%. LigQ is available at http://ligq.qb.fcen.uba.ar/.

Phylogeographic history of Patagonian lizards of the Liolaemus elongatus complex (Iguania: Liolaemini) based on mitochondrial and nuclear DNA sequences Medina, Cintia Débora; Avila, Luciano Javier; Sites, Jack Walter; Morando, Mariana In this study, we present a phylogeographic analysis of a group of lizards distributed in north-western Patagonia, the Liolaemus elongatus complex. We sequenced 581 individuals for one mitochondrial gene (cytochrome-b), and for a subset, we sequenced another mitochondrial gene (12S rRNA) and two nuclear genes: kinesin family member 24 (KIF24) and the anonymous nuclear locus LDAB1D. We estimated gene trees, mitochondrial and nuclear haploytpe networks, standard molecular diversity indices, genetic distances between lineages and Bayesian skyline plots. Our results provide evidence for recognition of seven species previously described within the L. elongatus complex: Liolaemus antumalguen, Liolaemus chillanensis, Liolaemus carlosgarini, Liolaemus burmeisteri, Liolaemus smaug, Liolaemus elongatus and Liolaemus crandalli, but we did not find sufficient evidence to support Liolaemus choique, Liolaemus shitan or Liolaemus sp. 6 as distinct species. We identified four candidate species (Liolaemus sp. 1, Liolaemus sp. 2, Liolaemus sp. 3 and Liolaemus sp. 7), and we discuss evolutionary processes that may have contributed to the origin of these lineages and their taxonomic and conservation implications.

Una apuesta por la vida: ética y estética en formas colectivo solidarias; Uma aposta pela vida: ética e estética em formas coletivo solidárias; A proposal for life: ethics and aesthetics in collective-solidarity forms Heras Monner Sans, Ana Ines; Miano, María Amalia; Pagotto, María Alejandra El artículo se inscribe en una investigación etnográfica realizada en Argentina con organizaciones orientadas por la autonomía como proyecto. Desde el marco conceptual del análisis institucional y las economías comunitarias, presenta una metodología que permite analizar prácticas, discursos y significados en tres experiencias autogestionarias. Analiza los modos que asumen el trabajo, la propiedad y la subjetividad en estas experiencias y concluye que: 1) su quehacer funda una propuesta ética y estética ligada al sostenimiento y disfrute de la vida y 2) sus formas de producir la existencia interpelan los sentidos del capitalismo actual.; O artigo se inscreve numa pesquisa etnográfica realizada na Argentina com organizações orientadas pela autonomia como projeto. Desde o marco conceitual da análise institucional e das economias comunitárias, apresenta uma metodologia que permite analisar práticas, discursos e significados em três experiências autogestionárias. Analisa os aspectos que o trabalho assume, a propriedade e a subjetividade nessas experiências e conclui que: 1) seu quefazer estabelece uma proposta ética e estética ligada ao sustento e gozo da vida e 2) suas formas de produzir a existência interpelam os sentidos do capitalismo atual.; The article is part of an ethnographic research carried out in Argentina within autonomy-oriented organizations. From the conceptual framework of institutional analysis and community economies, the article presents a methodology working towards the analysis of social practices, discourses and meanings in three self-managed experiences. It examines how communities view work, property and subjectivity in such experiences and concludes that: 1) their work states an ethical and aesthetic proposal linked to life sustenance and enjoyment and 2) their ways of existence question the current forms of capitalism.

Diabetes primary prevention program: new insights from data analysis of recruitment period Gagliardino, Juan Jose; Elgart, Jorge Federico; Bourgeois, Marcelo Javier; Etchegoyen, Graciela Susana; Fantuzzi, Gabriel; Ré, Matias; Ricart, Juan P.; García, Silvia; Giampieri, Cecilia; Gonzalez, Lorena; Suárez Crivaro, Florencia; Kronsbein, Peter; Angelini, Julieta M.; Martinez, Camilo; Martinez, Jorge; Ricart, Alberto; Spinedi, Eduardo Julio Primary Prevention of Diabetes Program in Buenos Aires Province evaluates the effectiveness of adopting healthy lifestyle to prevent type 2 diabetes (T2D) in people at high risk of developing it. We aimed to present preliminary data analysis of FINDRISC and laboratory measurements taken during recruitment of people for the Primary Prevention of Diabetes Program in Buenos Aires Province in the cities of La Plata, Berisso, and Ensenada, Argentina.