Territorio y pandemia: La urbanidad discontinuada Fedele Abatidaga, Javier A partir de ponderaciones generales sobre el nuevo contexto dado por los efectos de la COVID–19, se formulan reflexiones sobre las políticas públicas y los lineamientos que deberían nutrir las mismas. Se postula como clave la necesidad de un enfoque basado en el rescate de las estructuras de organización social y urbana orientadas estratégicamente. De manera simultánea, se analizan la correspondencia de este contexto de pandemia con la situación de las ciudades y los desafíos a los que la expone. Se parte de reconocer la dinámica socioeconómica y la alta interdependencia de los territorios urbanos, lo cual los expone a la actual situación de vulnerabilidad. Se recogen algunos de los tópicos vertidos en los debates suscitados en estos días para resituarlos problemáticamente: la cuestión de la densidad, el vacío del espacio público y la insuficiencia del espacio privado, entre otros. Densidades distribuidas, flexibilidades diseñadas y riesgos modulados, se postulan como estrategias urbanas en este contexto, intentando recoger las primeras reacciones en un conjunto de acciones orientadas estratégicamente. Todo ello en el marco de la problemática de los gobiernos locales, proponiendo los enfoques y lineamientos consecuentes para abordar los planes y proyectos de ciudad.; Based on reflections on the new context generated by COVID–19, this article considers public policies and establishes their possible guidelines. In this field, a strategic approach to social and urban organizational structures is essential. Afterwards, the correspondence of this pandemic context with the urban situation and their challenges is analyzed. The socio–economic dynamics and the high interdependence of urban territories expose them to the current vulnerability. Some of the topics raised in recent debates are problematized: the density question, the public space vacuum and the insufficiency of private space, among others. Distributed densities, designed flexibilities and modulated risks are postulated as urban strategies in this context, trying to gather the first reactions in a set of strategically oriented actions. All reflection is framed according to the problems of local government, proposing approaches and consistent guidelines to address urban plans and projects.

Mujeres en el trabajo municipal: las mucamas del Hospital Ramón Santamarina de Tandil y la demanda por su carrera laboral (1999- 2004); Women and municipal work: Maids of the Ramón Santamarina Hospital of Tandil, and the demand for their career (1999-2004) Minardo, Maria Florencia La demanda por la carrera laboral de las mucamas del Hospital municipal Ramón Santamarina de la ciudad de Tandil, reclamo que se extendió entre los años 1999 y 2004, es analizada en este trabajo, aproximación que busca indagar sobre las características de la organización del trabajo de este agrupamiento laboral que se encuadra en el sector de servicios del empleo público municipal. Este trabajo muestra cómo a partir de este reclamo gremial, las trabajadoras lograron, aunque sin proponérselo explícitamente, contestar o poner en tensión las definiciones estatales que entienden a estos trabajos como “no calificados”, noción que redunda en la desvalorización social y económica de las tareas de las mucamas en este espacio de trabajo altamente profesionalizado y jerárquico. El presente análisis se funda en cuatro entrevistas realizadas a trabajadoras mucamas, dirigentes sindicales y a la delegada de las mucamas en aquel contexto, como así también en documentos sindicales, como el mensuario del Sindicato de Municipales, y estatales como decretos del Poder Ejecutivo local, ordenanzas del Concejo Deliberante de la ciudad de Tandil y material del curso de formación profesional para mucama/ o para establecimientos de salud aprobado por la Dirección General de Cultura y Educación de la Provincia de Buenos en el año 2009.; The demand for the career of the maids at the Ramón Santamarina Municipal Hospital in the city of Tandil, a claim that lasted between 1999 and 2004, is analyzed in this work, an approach that seeks to investigate the characteristics of the organization of the work of This labor group that falls within the municipal public employment services sector. This work shows how, based on this union claim, the workers managed, although without explicitly proposing it, to answer or stress the state definitions that understand these jobs as "unskilled", a notion that results in the social and economic devaluation of the Maids tasks in this highly professional and hierarchical workspace. This analysis is based on four interviews with maid workers, union leaders and the maid delegate in that context, as well as union documents, such as the monthly from the Municipal Union, and state documents such as decrees of the local Executive Power, ordinances Deliberative Council of the city of Tandil and material of the professional training course for maid / or for health facilities approved by the General Directorate of Culture and Education of the Province of Buenos in 2009.

Catálogo comentado de los materiales tipo de los vertebrados de la Colección Paleontológica de la Facultad de Ciencias Exactas y Naturales de la Universidad Nacional de La Pampa, Argentina; Annotated catalog of vertebrate type specimens in the Paleontological Collection of Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, Argentina; Catálogo comentado dos materiais tipo dos vertebrados da Coleção Paleontológica da Faculdade de Ciências Exatas e Naturais da Universidade Nacional de La Pampa, Argentina Montalvo, Claudia I.; Kihn, Romina Gisela; Cerdeño Serrano, Maria Esperanza La Facultad de Ciencias Exactas y Naturales de la Universidad Nacional de La Pampa, Santa Rosa, Argentina, custodia una importante colección paleontológica iniciada en el año 1987, cuyo acrónimo es GHUNLPam. En la actualidad, contiene alrededor de 35.000 especímenes de invertebrados, vertebrados, plantas, icnofósiles y palinomorfos, que provienen principalmente de diferentes niveles fosilíferos de la provincia de La Pampa. Se presenta un catálogo del material tipo de la colección de vertebrados, correspondiente en su mayoría a mamíferos del Mioceno tardío de esta provincia. Incluye los holotipos de 15 especies publicados hasta fin del año 2019, siendo cuatro de ellas las especies tipo de los géneros correspondientes. Para cada taxón, se proporciona la información taxonómica actualizada, las sinonimias, la diagnosis original, enmendada o ampliada, según el caso (traducida al español si se publicó originalmente en otro idioma), la localidad tipo, la procedencia geográfica y estratigráfica, y la derivación del nombre del taxón. Finalmente, en algunos casos, se incluyen comentarios taxonómicos adicionales y materiales asignados en la publicación original.; Since 1987, the Facultad de Ciencias Exactas y Naturales of Universidad Nacional de La Pampa, Argentina, holds an important paleontological collection whose acronym is GHUNLPam. Currently, it contains about 35,000 specimens of invertebrates, vertebrates, plants, ichnofossils and palynomorphs, mainly from different fossiliferous levels of La Pampa Province. Here we present a catalog of the vertebrate type materials, largely corresponding to late Miocene mammals from this province. It includes the holotypes of 15 species published until the end of 2019; four of them are the type species for their corresponding genera. For each taxon, we provide updated taxonomy as well as synonyms, original or modified diagnosis (translated into Spanish if needed), type locality, geographic and stratigraphic provenance, and derivation of the name. Finally, in several cases we provide some taxonomic comments and list the specimens assigned in the original publication.; A Faculdade de Ciências Exatas e Naturais da Universidade Nacional de La Pampa, Santa Rosa, Argentina, abriga uma importante coleção paleontológica iniciada em 1987, cujo acrônimo é GHUNLPam. Atualmente, contém cerca de 35.000 espécimes de invertebrados, vertebrados, plantas, icnofósseis e palinomorfos, que provêm principalmente de diferentes níveis fossilíferos da província de La Pampa. Apresenta-se um catálogo do material tipo da coleção de vertebrados, correspondendo em sua maioria a mamíferos do Mioceno tardio desta província. Inclui os holótipos de 15 espécies publicadas até o final de 2019, sendo quatro delas as espécies tipo dos gêneros correspondentes. Para cada táxon, provê-se a informação taxonômica atualizada, as sinonímias, a diagnose original, emendada ou ampliada, conforme o caso (traduzida para o espanhol se foi publicada originalmente em outro idioma), a localidade tipo, a procedência geográfica e estratigráfica, e a derivação do nome do táxon. Finalmente, em alguns casos, são incluídos comentários taxonômicos adicionais e materiais assignados na publicação original.

La Mesa Intersindical de Tandil (2016-2019): unidad sindical frente a la restauración neoliberal en ciudades medias de la Provincia de Buenos Aires; The Inter Trade Union of Tandil (2016-2019): union unity against neoliberal restoration in mediumsized cities in the Province of Buenos Aires Adamini, Marina Este artículo analiza el fenómeno de organización intersindical que se desarrolló en diferentes ciudades medias de Argentina como forma de respuesta a las medidas de ajuste neoliberal aplicadas por el gobierno de Mauricio Macri. Partimos de observar cómo ante un contexto de cierre de empresas, aumento del desempleo, inflación y depreciación salarial, los sindicatos locales de diferentes sectores productivos y con diversas pertenencias políticas se articularon institucionalmente para debatir problemáticas comunes y desarrollar medidas de lucha conjuntas. El análisis de este fenómeno lo realizamos a partir del caso de la Mesa Intersindical de Tandil (MIT), que surgió en 2016 articulando alrededor de 20 sindicatos de diferentes sectores productivos, pertenecientes a la Confederación General del Trabajo (CGT) y la Central de Trabajadores de la Argentina (CTA). Buscamos identificar los rasgos comunitarios de este proceso de organización, a la luz de las particularidades que asume la sociabilidad laboral y gremial en el contexto local de una ciudad media como Tandil. Abordamos sus formas de organización, demandas y repertorios de acción, en su proceso de conformación y transformación entre 2016-2019. En términos metodológicos cualitativos, desarrollamos un análisis documental de fuentes periodísticas locales, comunicados de la MIT, y entrevistas a sus principales referentes.; This article analyzes the phenomenon of inter-union organization that developed in different middle cities of Argentina as a way of responding to the neoliberal adjustment measures applied by the Mauricio Macri government. We started by observing how, in a context of business closure, increased of unemployment, inflation and wage depreciation, local trade unions of different productive sectors and political belongings articulated institutionally to discuss common problems and develop control measures joint. The analysis of this experience was carried out based on the case of the Inter Trade Union of Tandil, which emerged in 2016, articulating around 20 trade unions from different productive sectors, belonging to the Confederación General del Trabajo (CGT) and Central de Trabajadores de la Argentina (CTA). We seek to identify the community aspects of this informal trade union organization process, in the light of the particularities that sociability assumes in the local context of a middle city like Tandil. We analyzed their forms of organization, demands and repertoires of action, in their process of conformation and transformation between 2016-2019. In qualitative methodological terms, we developed a documentary analysis of local journalistic sources, releases, and interviews with their main referents.

Immunity and health of two wild marine fishes naturally exposed to anthropogenic pollution Sueiro, Maria Cruz; Awruch, Cynthia Andrea; Gilardoni, Carmen Mariangel; Demetrio, Muriel; Palacios, María Gabriela There are increasing global concerns of the alarming pollution impacts on marine life, thus it is becoming essential to generate reliable tools to monitor and understand the effects of these impacts on aquatic organisms. We performed a field study assessing how exposure to anthropogenic pollution impacts immunological and health-state parameters and parasite infection of a wild marine fish, the Brazilian sandperch Pinguipes brasilianus. Then we compared this information to previously published data of a sympatric species, the Patagonian rockfish Sebastes oculatus inhabiting the same polluted and pristine areas. The field study revealed that exposed P. brasilianus showed chronic stress, poor immune condition and higher prevalence and abundance of acanthocephalan parasites. By comparing these former results with already published in S. oculatus, we concluded that, although both species exhibited physiological alterations associate to inhabiting sites exposed to pollution, their specific immunological and health-state responses differed. Our results demonstrate that Patagonian reef-fish assemblages inhabiting sites exposed to pollutant are being affected in their immune and heath condition, which could potentially result in higher susceptibility to disease and in turn population decline. These findings highlight the necessity of more studies incorporating interspecific comparisons to assess variation in fish susceptibility in an ecoimmunotoxicological context and get a more profound understanding of anthropogenic impacts on wildlife.

Urban populations of Aedes aegypti (Diptera: Culicidae) from Central Argentina: Dispersal patterns assessed by bayesian and multivariate methods Ayala, Ana Maria; Vera, Noelia Soledad; Chiappero, Marina Beatriz; Almiron, Walter Ricardo; Gardenal, Cristina Noemí Aedes aegypti (L.), the main vector of dengue and other arboviruses, was declared eradicated from Argentinain 1964; however, in 1987, it was detected again and nowadays it occurs in most of the country territory. Tounderstand the transmission of vector-borne diseases, knowledge of the dispersal of vector populations isessential to evaluate the risk of pathogen transmission. We conducted a population genetic analysis of Ae.aegypti in 20 neighborhoods from C¨®rdoba, the second largest city in Argentina, using 10 microsatellite loci.High genetic differentiation and the absence of an isolation by distance pattern was found using Weir andCockerham¡¯s ¦È. Bayesian and multivariate clustering analyses showed that the studied sites included individualswith high membership coefficients (Q) in their populations, individuals with membership in anothercluster, and admixed individuals. Individuals with high Q in clusters different from the population in whichthey were collected strongly suggests that passive transport is important in shaping the Ae. aegypti dispersalpattern in Córdoba city. Knowing the genetic structure of Ae. aegypti populations and their dispersal patternswould contribute to the implementation of vector control programs.

A lateral flow immunoassay based on colored latex particles for detection of canine visceral leishmaniasis Garcia, Valeria Soledad; Guerrero, Sergio Adrian; Gugliotta, Luis Marcelino; González, Verónica Doris Guadalupe Canine visceral leishmaniasis (CVL) is the major source of human visceral leishmaniasis. To control the spread of this disease, early and accurate detection of infected dogs is critical but challenging. The serological diagnosis of CVL remains problematic because there are no reliable commercially available tests. Most laboratories use enzyme-linked immunosorbent assay or the indirect immunofluorescent antibody test. These tests use Leishmania chagasi recombinant antigens K39 or K26 assembled with either gold-labelled Staphylococcus aureus protein A or protein G from Streptococcus pyogenes. In this work, we propose the development, optimization and standardization of a lateral flow immunoassay (LFIA) based on functionalized colored particles and a specific recombinant antigen, as a visual in situ method for the diagnosis of CVL. The following analysis variables were considered: i) the concentration of the latex-protein complex; ii) the dilution of the serum; iii) the composition of the employed buffers; iv) the nominal capillary flow time through the nitrocellulose membrane; v) the concentration of reagents fixed in the test and control lines; vi) the particle size of the colored latex; and vii) the conjugation method. Then, the obtained strips were evaluated as a visual diagnostic tool based on a panel of positive and negative sera. It was observed that because of its simplicity and performance the LFIA test is a quick and reliable alternative for the diagnosis of CVL either in conventional laboratories or for remote areas where laboratories are not readily accessible for conventional assays.

Vínculos y redes sociales en torno a colecciones de museos. Las colecciones arqueológicas del Museo Histórico del Norte (Salta), hacia mediados del siglo XX; Links and social networks regarding museum collections. The archaeological collections of the Museo Histórico del Norte (Salta), towards the mid-20th century Castellanos, María Cecilia; Mamani, Elsa Mabel; Rueda, Facundo; Rodríguez, Mónica; Lavilla, Florencia El artículo aborda la conformación de la colección arqueológica del Museo Histórico del Norte (Provincia de Salta), para lo cual se reseña el contexto social y político, nacional y local, bajo el cual se crea el Museo y se hace referencia a las formas de adquisición de la colección durante los momentos iniciales de la institución. Los trabajos realizados sobre la colección arqueológica aportaron información que permitió indagar en problemáticas relacionadas con las redes sociales que se establecieron entre el Museo, benefactores o donantes de piezas arqueológicas y otras instituciones durante la primera mitad del siglo XX. El cruce de diferentes fuentes generó también ideas para pensar los procesos de institucionalización de la práctica arqueológica en la provincia y el papel que pudieron haber tenido las colecciones arqueológicas; This work analyzes the conformation of the archaeological collection of the “Museo Histórico del Norte” (Salta province). For this goal, the creation of the museum is reviewed in terms of the social and political context of the time at both local and national scales. The manner of acquisition of the collections during the initial moments of the institution is also referenced. The studies carried out on this archaeological collection provided information that allowed us to preliminary define the social networks that were established between the museum, benefactors or donors of archaeological items and other institutions during the first half of the 20th century. Cross-referencing different documentary sources also generated ideas to analyze the processes of institutionalization of archaeological practice in Salta and the role that could have been played by archaeological collections

Drivers of global Scolytinae invasion patterns Lantschner, María Victoria; Corley, Juan Carlos; Liebhold, Andrew M. Biological invasions are affected by characteristics of invading species, strength of pathway connectivity among world regions and habitat characteristics of invaded regions. These factors may interact in complex ways to drive geographical variation in numbers of invasions among world regions. Understanding the role of these drivers provides information that is crucial to the development of effective biosecurity policies. Here we assemble for the first time a global database of historical invasions of Scolytinae species and explore factors explaining geographical variation in numbers of species invading different regions. This insect group includes several pest species with massive economic and ecological impacts and these beetles are known to be accidentally moved with wood packaging in global trade. Candidate explanatory characteristics included in this analysis are cumulative trade among world regions, size of source species pools, forest area, and climatic similarity of the invaded region with source regions. Species capable of sib‐mating comprised the highest proportion on nonnative Scolytines, and these species colonized a higher number of regions than outbreeders. The size of source species pools offered little power in explaining variation in numbers of invasions among world regions nor did climate or forest area. In contrast, cumulative trade had a strong and consistent positive relationship with numbers of Scolytinae species moving from one region to another, and this effect was highest for bark beetles, followed by ambrosia beetles, and was low for seed and twig feeders. We conclude that global variation in Scolytine invasions is primarily driven by variation in trade levels among world regions. Results stress the importance of global trade as the primary driver of historical Scolytinae invasions and we anticipate other hitchhiking species would exhibit similar patterns. One implication of these results is that invasions between certain world regions may be historically low because of past low levels of trade but future economic shifts could result in large numbers of new invasions as a result of increased trade among previously isolated portions of the world. With changing global flow of goods among world regions, it is crucial that biosecurity efforts keep pace to minimize future invasions and their impacts.

Trabajo, género y desigualdades en la economía popular. Una mirada sobre la situación de los vendedores/as callejeros en tiempos de pandemia; Work, gender and inequalities in the popular economy. A look at the situation of street vendors in times of pandemic; Trabalho, género e desigualdades na economia popular. Umolhar sobre a situação dos vendedores ambulantes em tempos de pandemia Hopp, Malena Victoria; Maldovan Bonelli, Johanna; Frega, Mariana Gabriela; Trajtember, Agustina Las medidas de Aislamiento Social, Preventivo y Obligatorio, decretadas el 20 de marzo del 2020 en la Argentina a causa del avance de la pandemia del COVID-19, han puesto en evidencia las profundas desigualdades en el mundo del trabajo y en las condiciones de vida de los distintos sectores de la sociedad. En este contexto, los trabajadores y las trabajadoras de la economía popular han sido fuertemente afectados: la inmensa mayoría viven al día con ingresos de subsistencia y se encuentran por fuera de los dispositivos formales de protección social.En este artículo nos proponemos abordar la particular situación en la que se encuentran los/as vendedores/as callejeros/as de la Ciudad Autónoma de Buenos Aires, considerando dos dimensiones que permiten comprender las condiciones de (re)producción y profundización de las desigualdades en tiempos de crisis: el género y el acceso a las políticas públicas. El análisis muestra que, frente al escenario actual y futuro, se requiere un cambio en la orientación de las acciones estatales que gire desde la lógica asistencial hacia el reconocimiento del valor económico, social y cultural del trabajo que aportan los/as trabajadores/as de la economía popular y contemplando sus problemáticas de manera integral con perspectiva de género.

In Silico Analysis of Sea Urchin Pigments as Potential Therapeutic Agents Against SARS-CoV-2: Main Protease (Mpro) as a Target Rubilar Panasiuk, Cynthia Tamara; Barbieri, Elena Susana; Gázquez, Ayelén; Avaro, Marisa; Vera Piombo, Mercedes; Gittardi Calderón, Agustín Adolfo; Seiler, Erina Noé; Fernandez, Jimena Pía; Sepúlveda, Lucas Roberto; Chaar, Florencia The SARS-CoV-2 outbreak has spread rapidly and globally generating a new coronavirus disease (COVID-19) since December 2019 that turned into a pandemic. Effective drugs are urgently needed and drug repurposing strategies offer a promising alternative to dramatically shorten the process of traditional de novo development. Based on their antiviral uses, the potential affinity of sea urchin pigments to bind main protease (Mpro) of SARS-CoV-2 was evaluated in silico. Docking analysis was used to test the potential of these sea urchin pigments as therapeutic and antiviral agents. All pigment compounds presented high molecular affinity to Mpro protein. However, the 1,4-naphtoquinones polihydroxilate (Spinochrome A and Echinochrome A) showed high affinity to bind around the Mpro´s pocket target by interfering with proper folding of the protein mainly through an H-bond with Glu166 residue. This interaction represents a potential blockage of this protease´s activity. All these results provide novel information regarding the uses of sea urchin pigments as antiviral drugs and suggest the need for further in vitro and in vivo analysis to expand all therapeutic uses against SARS-CoV-2.

Durable performance of recycled aggregate concrete in aggressive environments Zega, Claudio Javier; Santillan, Lautaro Rodolfo; Sosa, Maria Eva; Villagrán Zaccardi, Yury Andrés Recycled aggregate concrete is an eco-friendly material that is increasingly being used in new constructions. Nowadays, this application is mainly limited by user?s lack of confidence, as coarse recycled aggregate (CRA) is usually more porous, i.e., it has a higher water absorption, than coarse natural aggregate. This difference is a primary concern for practitioners when they have to comply with durability requirements. Although some uncertainties remain in this regard, significant progress has been made in the last few years concerning the assessment of durable recycled aggregate concrete. This paper reviews this topic and includes aspects related to chloride penetration, sulfate attack, freezing and thawing, high temperature, and alkali-silica reaction. Generally, although there are some particularities related to each type of attack, the high porosity of CRA is compensated by other features, such as different texture, increased mechanical compatibility with the matrix, or content of hydration products. Experimental results in the literature show that there are no reasons to consider that durable, sustainable structures cannot be built with recycled aggregate concrete.

Manuel Costa-Iscar y el anarquismo individualista en Buenos Aires; Manuel Costa-Iscar and individualist anarchism in Buenos Aires Stavisky, Sebastián El artículo analiza el modo de practicar y difundir el anarquismo individualista por parte de Manuel Costa-Iscar, militante español que arriba a Buenos Aires en los primeros años de la década del 20. El trabajo tiene un doble propósito: avanzar en la lectura y análisis del corpus textual del autor asumiendo como perspectiva los aportes de Foucault acerca de las tecnologías del yo; discutir con ciertos modos cristalizados por la historiografía en la consideración del anarquismo individualista en Argentina.; The article analyzes the way of practicing and spreading the individualist anarchism by Manuel Costa-Iscar, a Spanish activist who arrive to Buenos Aires in the early years of the 1920s. The work has a double purpose: to advance in the reading and analysis of the textual corpus of the author, assuming as perspective the Foucault’s contributions about the technologies of the self; to discuss with certain crystallized ways in which the historiography considers individualist anarchism in Argentina.

Catálogo de la colección de cultivos de especies de hongos patógenos y simbiontes de insectos y otros artrópodos de la Argentina; Catalogue of the culture collection of symbionts and pathogenic fungal species of insects and other arthropods from Argentina Lopez Lastra, Claudia Cristina; Manfrino, Romina Guadalupe; Rodríguez, Mónica B.; Gutierrez, Alejandra Concepción; Ordoqui, Eliana; Navone, Graciela Teresa El presente trabajo, tiene como objetivo dar a conocer los datos actualizados e información relevante de las cepas de especies fúngicas entomopatógenas preservadas en la colección de cultivos del CEPAVE (Centro de Estudios Parasitológicos y de Vectores) CONICET-UNLP, Argentina. Los datos que se informan en este trabajo son de aislamientos nativos de diferentes regiones fitogeográficas de la Argentina. Para cada cepa se especifica: acrónimo, sustrato, especie de insecto hospedante, fecha de recolección, referencias de coordenadas geográficas y medio de cultivo en el que fue aislado. Los fines de esta Colección son de investigación, docencia y vinculación tecnológica a empresas. Su inicio fue en 1988 y, actualmente se encuentra registrada en la FELACC (Federación Latinoamericana de Colecciones de Cultivos) como Socio Institucional: Nº SI-06 y en la Federación Mundial de Colecciones de Cultivos (World Federation for Culture Collections – WFCC) (http://www.wfcc.info/). Siguiendo las pautas de organización de la WFCC esta colección está incorporada a: World Data Centre for Microorganisms (WDCM, Nº 973 CEP). Los métodos de preservación que se utilizan son: agua destilada estéril, papel, aceite mineral, sílica gel, freezer -20 °C y -70 °C y liofilización, siendo realizados rigurosos controles de calidad y de viabilidad de las cepas. Las cepas son caracterizadas por técnicas morfológicas y el 30 % de los aislamientos fúngicos han sido caracterizados, además, mediante técnicas de biología molecular. En la actualidad, la colección mantiene más de 650 cepas correspondientes en su mayoría a los géneros Beauveria, Metarhizium, Isaria, Lecanicillium y algunas especies de Entomophthorales.; and technological associations with companies. It started in 1988, and it is registered in the Latin American Federation of Culture Collections (FELACC) as Institutional Partner: No. SI-06, and in the World Federation for Culture Collections (WFCC) (http://www.wfcc.info/). In accordance with the WFCC guidelines, this collection is incorporated as a partner to the World Data Centre for Microorganisms (WDCM, 973 CEP). The preservation methods used are sterile distilled water, paper, mineral oil, silica gel, freezer at -20 and -70 °C and lyophilization, quality and viability controls are carried out. So far, 40 % of the species have been identified by molecular techniques, and the study of the remaining isolated species is under development. The collection consists of more than 684 strains which belong mostly to the Beauveria, Metarhizium, Isaria, Lecanicillium genera, as well as some species of Entomophthorales.

Neuroanatomy of the lumbosacral plexus in a highly diversified clade of South-American lizards. Evolution and phylogenetic implications Quipildor, Angel Matías; Quinteros, Andres Sebastian; Lobo Gaviola, Fernando Jose Only few published studies that describe the neuroanatomy of lizards. Here, we describe the neuroanatomy of several Iguanian species belonging to three families (species of Liolaemus and Phymaturus belonging to Liolaemidae, Tropidurus and Stenocercus as representatives of Tropiduridae, and Diplolaemus as a representative of Leiosauridae). Based on Sudan Black B staining and conventional dissections, the neuroanatomy of the lumbosacral region is described. Among the most outstanding results is the existence of a neuronal pattern of the lumbosacral plexus characteristic of Liolaemidae. In addition, it was found that in the genus Liolaemus the lumbosacral plexus is composed of five pairs of spinal nerves while in Phymaturus, Tropidurus, Stenocercus and Diplolaemus is composed from five to six pairs of spinal nerves (from pre-sacral, sacral, and caudal vertebrae). We find differences in the origin of the spinal nerves that constitute the plexus. In some cases, the pattern of nerves involved includes even the caudal vertebrae. Variation among taxa related to the zeugopodial innervation is described, and the homology of these nervous branches is discussed. Sexual differences were found in some species studied. Based on our results and available literature, we found three different patterns of innervation of the zeugopodium. The major contribution of this study is to provide a detailed description of lumbosacral plexus nerves pathways from their origins at the vertebral column to the muscles that they innervate.

A structural indicator for water built upon potential energy considerations Montes de Oca, Joan Manuel; Sciortino, Francesco; Appignanesi, Gustavo Adrian We introduce a parameter-free structural indicator to classify local environments of water molecules in stable and supercooled liquid states, which reveals a clear two-peak distribution of local properties. The majority of molecules are tetrahedrally coordinated (T molecules), via low-energy hydrogen bonds. The minority component, whose relative concentration decreases with a decrease in the temperature at constant pressure, is characterized by prevalently three-coordinated molecules, giving rise to a distorted local network around them (D molecules). The inter-conversion between T and D molecules explains the increasing specific heat at constant pressure on cooling. The local structure around a T molecule resembles the one found experimentally in low-density amorphous ice (a network structure mostly composed by T molecules), while the local structure around a D molecule is reminiscent of the structural properties of high-density amorphous ice (a network structure composed by a mixture of T and D molecules).

El diario de Gabriel Quiroga: reflexiones de Manuel Gálvez ante el centenario de la Revolución de Mayo; The Diary of Gabriel Quiroga: Reflections by Manuel Galvez to the centenary of the May Revolution Rubio García, Gonzalo El diario de Gabriel Quiroga fue una obra escrita a principios del siglo XX por Manuel Gálvez que, como veremos, logró calar hondo en el pensamiento de la población argentina. A su vez, es un texto que ha sido destacado por muchos intelectuales debido a sus apelaciones al nacionalismo cultural y las nociones de corte positivista, así como también sus aportes modernistas y anti positivistas. Por dicha razón, ante la diversidad de construcciones encontradas, nuestro objetivo en este trabajo es indagar y revisar las ideas que el autor sostuvo en esta obra, teniendo en cuenta que se trata de su primer acercamiento literario hacia la crítica del pasado argentino y el género de diario ficcional. Consideramos que la estrategia elegida permitió al autor destacar un personaje, representativo de otros hombres en su época, que era habilitado por la matriz realista de la obra. Bajo ese formato, logró que las posturas expuestas sirvieran como una construcción fidedigna de muchas de las ideas que circulaban en la época del Centenario y como antecedente intelectual para otros pensadores que posteriormente adhirieron al nacionalismo.; The Diario de Gabriel Quiroga was written at the beginning of the 20th century by Manuel Gálvez that, as we will see, managed to penetrate deep into the ideas of the Argentine population. In turn, it is a text that has been highlighted by many intellectuals due to its appeals to cultural nationalism and positivist topics, as well as its modernist and anti-positivist contributions. For this reason, given the diversity of constructions found, our objective in this work is to investigate and review the ideas that the author sustained in this work, bearing in mind that this is his first literary approach to criticism of the Argentine past and the genre of fictional diary chosen for the writing. We consider that the chosen strategy allowed the author to highlight a character, representative of other men in his time, who was enabled by the realistic matrix of the work. Under this format, he achieved that the positions exposed in his writing served as a reliable construction of many of the ideas that circulated in the Centennial era and as an intellectual antecedent for other intellectuals who later adhered to nationalism.

The foehn wind east of the Andes in a 20-year climate simulation Antico, Pablo Luis; Chou, Sin Chan; Brunini, Claudio Antonio This study investigates the spatial structure and the seasonal occurrence of foehn wind to the east of the Andes using a flow blocking analysis in a 20-year climate simulation. The latter was performed by the Eta-CPTEC regional model at 50-km horizontal resolution. This version of the model includes a cut-cell scheme to represent topography and a finite-volume vertical advection scheme for dynamic variables. The results indicate that foehn wind more frequently blows during winter and spring on the eastern slopes of the Andes, except to the south of 37° S where it blows at all seasons. Higher mountains of the Central Andes (27° S–35° S) and the High Plateau (15° S–27° S) result in blocked foehn events, with a weak adjustment to the geostrophic balance. On the Central Andes, rain and snow on mountain tops may also contribute to generate foehn wind on the eastern slopes. The results show that a low pressure develops to the east of the Central Andes, and also to the east of the High Plateau when foehn blows. Lower mountains in Patagonia (to the south of 37° S) result in more frequent non-blocked foehn event, with better adjustment to the geostrophic balance.

El caso de ACINDAR en Villa Constitución y el ciclo de transformaciones represivas, productivas y laborales entre dictadura y democracia; O caso da ACINDAR Villa Constitución e o ciclo de transformações repressivas, produtivas e trabalhistas entre ditadura e democracia; The case of ACINDAR Villa Constitución and the cycle of repressive, productive and labor transformations between dictatorship and democracy Basualdo, Victoria Este artículo analiza la evolución de la empresa siderúrgica Acindar Villa Constitución (Provincia de Santa Fe), en el marco de las transformaciones en la industria siderúrgica desde la década del 70 hasta la década del 90. Se detiene en los impactos de la última dictadura en Argentina (1976-1983), las conexiones entre las fuerzas armadas y la dirigencia empresarial, y el proceso represivo de inédita intensidad llevado adelante en esta etapa, así como las transformaciones en las relaciones laborales y las dimensiones productivas, y la conformación de un oligopolio siderúrgico al final de la dictadura. Analiza también el proceso de reconversión productiva entre fines de la década del 80 e inicios del 90, enfatizando que en la salida de ese ciclo de conflicto se promovió la expansión de la tercerización laboral como una estrategia con fuerte impacto en el colectivo laboral y la trayectoria productiva y empresarial.; Este artigo analisa a evolução da empresa siderúrgica Acindar Villa Constitución (província de Santa Fe), no âmbito das transformações na indústria siderúrgica desde a década de 70 até a de 90. Detém-se nos impactos da última ditadura na Argentina (1976-1983), as conexões entre as forças armadas e a liderança empresarial e o processo repressivo de inédita intensidade levado adiante nesta fase, assim como as transformações nas relações de trabalho e nas dimensões produtivas, além da conformação de um oligopólio siderúrgico no final da ditadura. Analisa também o processo de reconversão produtiva entre o final da década de 80 e o início da década de 90, enfatizando que na saída desse ciclo de conflito promoveu-se a expansão da terceirização laboral como uma estratégia com forte impacto sobre o coletivo de trabalhadores e na trajetória produtiva e empresarial.; This article analyzes the evolution of the Acindar steel mill in Villa Constitución, Province of Santa Fe, in the context the transformations of the steel industry in Argentina from the 1970s to the 1990s. It focuses on the impact of the last dictatorship (1976-1983), the connections between the armed forces and the business leadership and the repressive process of unprecedented intensity during this period. It also studies the transformations in labor relations and productive dimensions, which led to an oligopoly in steel industry by the end of the dictatorship. It also pays special attention to the process of industrial reorganization developed from the late 1980s to the early 1990s, emphasizing that in the closure of this labor conflict there was an expansion of outsourcing and subcontracting, which had a strong impact on labor relations and productive and business strategies.

Intracellular motor driven transport of rodlike smooth organelles along microtubules Fernández Casafuz, Agustina Belén; de Rossi, María Cecilia; Bruno, Luciana Molecular motors are fascinating proteins that use the energy of ATP hydrolysis to drive vesicles and organelles along cytoskeleton filaments toward their final destination within the cell. Several copies of these proteins bind to the cargo and take turns transporting the cargo attaching to and detaching from the track stochastically. Despite the relevance of molecular motors to cell physiology, key aspects of their collective functioning are still unknown. In this work we propose a one-dimensional model for the transport of extensive and smooth organelles driven by molecular motors. We ran numerical simulations to study the behavior of the cargo for different motor configurations, focusing on the transport properties observable in the experiments, e.g., average speed of the organelle and variations in length. We found that active motors drive the cargo using two different mechanisms: Either they locate in front of the cargo and pull the organelle or they situate at the cargo lagging edge and push. Variations in the organelle length is in close relation with the fraction of motors in each configuration, which depends on the resisting load. The results of this model were contrasted with experimental data obtained from the tracking of rodlike mitochondria during active transport in Xenopus laevis melanophores.