2,689 research outputs found

    Gravitational Fragmentation in Galaxy Mergers: A Stability Criteria

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    We study the gravitational stability of gaseous streams in the complex environment of a galaxy merger, because mergers are known to be places of ongoing massive cluster formation and bursts of star formation. We find an analytic stability parameter for case of gaseous streams orbiting around the merger remnant. We test our stability criteria using hydrodynamical simulations of galaxy mergers, obtaining satisfactory results. We find that our criteria successfully predicts the streams that will be gravitationally unstable to fragment into clumps.Comment: 10 pages, 2 figures. After 2nd referee repor

    Content-centric Routing in Wi-Fi Direct Multi-group Networks

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    The added value of Device-to-Device (D2D) communication amounts to an efficient content discovery mechanism that enables users to steer their requests toward the node most likely to satisfy them. In this paper, we address the implementation of content-centric routing in a D2D architecture for Android devices based on WiFi Direct, a protocol recently standardised by the Wi-Fi Alliance. After discussing the creation of multiple D2D groups, we introduce novel paradigms featuring intra- and inter-group bidirectional communication. We then present the primitives involved in content advertising and requesting among members of the multi-group network. Finally, we evaluate the performance of our architecture in a real testbed involving Android devices in different group configurations. We also compare the results against the ones achievable exploiting Bluetooth technologies

    Winter survivorship of hatchling broad-snouted caimans (Caiman latirostris) in Argentina

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    The first life stage of crocodilians is considered the most critical in terms of survival, particularly in regions that have well-defined cold seasons. To estimate this parameter for hatchling broad-snouted caimans, Class I (CI = snout-vent length < 25 cm), we released 36 caimans (18 in 2018, and 18 in 2019) born in captivity that were equipped with VHF radio-transmitters, and we monitored them during each first winter season. We actively searched for the animals during field trips and registered their status as alive, dead, lost transmitter (LT), or radio signal ceased (SC). Due to the occurrence of LT and SC, we proposed eight possible survival scenarios, assuming different combinations of "alive" and "dead" caimans. We analyzed each scenario and compared it between years. In 2018 we found 55.5% dead and 44.5% LT, resulting in survival estimates from 0 to 0.38 according to the scenario. In 2019 we found 50% alive, 33% LT, and 17% SC, with survival varying from 0.5 to 1. Survival in 2019 was higher than in 2018 in all scenarios. Assuming predation was the most plausible cause of LT, with the most likely scenarios estimated 0% survival in 2018 (although the minimum detectable by this methodology is 5%) and 67% in 2019. This information can be helpful for ranching with release programs, as it allows for a better adjustment of the reintroduction rate and opens up the possibility of earlier releases when resources to keep animals in enclosures are scarceFil: Viotto, Evangelina del Valle. Provincia de Entre R√≠os. Centro de Investigaciones Cient√≠ficas y Transferencia de Tecnolog√≠a a la Producci√≥n. Universidad Aut√≥noma de Entre R√≠os. Centro de Investigaciones Cient√≠ficas y Transferencia de Tecnolog√≠a a la Producci√≥n. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - Santa Fe. Centro de Investigaciones Cient√≠ficas y Transferencia de Tecnolog√≠a a la Producci√≥n; ArgentinaFil: Simoncini, Melina Soledad. Provincia de Entre R√≠os. Centro de Investigaciones Cient√≠ficas y Transferencia de Tecnolog√≠a a la Producci√≥n. Universidad Aut√≥noma de Entre R√≠os. Centro de Investigaciones Cient√≠ficas y Transferencia de Tecnolog√≠a a la Producci√≥n. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - Santa Fe. Centro de Investigaciones Cient√≠ficas y Transferencia de Tecnolog√≠a a la Producci√≥n; ArgentinaFil: Verdade, Luciano Martins. Universidade de Sao Paulo; BrasilFil: Navarro, Joaquin Luis. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - C√≥rdoba. Instituto de Diversidad y Ecolog√≠a Animal. Universidad Nacional de C√≥rdoba. Facultad de Ciencias Exactas F√≠sicas y Naturales. Instituto de Diversidad y Ecolog√≠a Animal; ArgentinaFil: Pi√Īa, Carlos Ignacio. Provincia de Entre R√≠os. Centro de Investigaciones Cient√≠ficas y Transferencia de Tecnolog√≠a a la Producci√≥n. Universidad Aut√≥noma de Entre R√≠os. Centro de Investigaciones Cient√≠ficas y Transferencia de Tecnolog√≠a a la Producci√≥n. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - Santa Fe. Centro de Investigaciones Cient√≠ficas y Transferencia de Tecnolog√≠a a la Producci√≥n; Argentin

    Agua y energía en la provincia de Córdoba: tarifas, carga tributaria y efectos sobre la competitividad de las PYMES cordobesas

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    Este trabajo analizar√° la situaci√≥n actual de los servicios de agua y energ√≠a el√©ctrica en la provincia de C√≥rdoba; en especial, la calidad, las tarifas, la carga tributaria y los efectos sobre la competitividad de las Pymes localizadas en esa provincia. El inter√©s del estudio se origina en la evidencia de diferencias significativas en torno a las variables mencionadas en dos Dimensiones: entre distintas jurisdicciones provinciales y entre los distintos municipios y comunas de la provincia. En particular, se analizar√° la carga tributaria de estos servicios para un grupo de ciudades de la Rep√ļblica Argentina y las situaciones de disponibilidad y caracter√≠sticas generales de los mismos para un conjunto de Pymes cordobesas. Los resultados de la investigaci√≥n permitir√°n inferir algunas correcciones necesarias en t√©rminos de pol√≠ticas p√ļblicas, atendiendo fundamentalmente a los problemas de provisi√≥n y regulaci√≥n de esos servicios.http://blogs.eco.unc.edu.ar/jifp/files/t412.pdfFil: As√≠s, In√©s del Valle. Universidad Nacional de C√≥rdoba. Facultad de Ciencias Econ√≥micas; Argentina.Fil: As√≠s, In√©s del Valle. Universidad Nacional de Villa Mar√≠a; Argentina.Fil: Crisafulli, Luciano. Universidad Nacional de C√≥rdoba. Facultad de Ciencias Econ√≥micas; Argentina.Fil: Devalle, Sof√≠a. Universidad Nacional de C√≥rdoba. Facultad de Ciencias Econ√≥micas; Argentina.Fil: Devalle, Sof√≠a. Instituto Argentino de An√°lisis Fiscal; Argentina.Fil: Parisi, Daniel. Universidad Nacional de C√≥rdoba. Facultad de Ciencias Econ√≥micas; Argentina.Fil: Parisi, Daniel. Agencia para el Desarrollo Econ√≥mico de la Ciudad de C√≥rdoba; Argentina.Otras Econom√≠a y Negocio

    Agua y energía en la provincia de Córdoba: tarifas, carga tributaria y efectos sobre la competitividad de las PYMES cordobesas

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    La calidad, tarifas, y carga tributaria de los servicios de agua y energía eléctrica afecta la competitividad de las Pymes cordobesas. Es de interés estudiar las diferencias de esas variables entre distintas jurisdicciones de Argentina y entre los distintos municipios de nuestra provincia.http://eidipa-2015.congresos.unc.edu.ar/inicioFil: Asís, Inés del Valle. Universidad Nacional de Córdoba. Facultad de Ciencias Económicas. Instituto de Economía y Finanzas; Argentina.Fil: Crisafulli, Luciano. Universidad Nacional de Córdoba. Facultad de Ciencias Económicas. Instituto de Economía y Finanzas; Argentina.Fil: Devalle, Sofía. Universidad Nacional de Córdoba. Facultad de Ciencias Económicas. Instituto de Economía y Finanzas; Argentina.Fil: Parisi, Daniel. Universidad Nacional de Córdoba. Facultad de Ciencias Económicas. Instituto de Economía y Finanzas; Argentina.Otras Economía y Negocio

    Evidence for a More Disrupted Immune-Endocrine Relation and Cortisol Immunologic Influences in the Context of Tuberculosis and Type 2 Diabetes Comorbidity

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    Pulmonary tuberculosis (PTB), caused by Mycobacterium tuberculosis (Mtb), is a major health problem worldwide, further aggravated by the convergence of type 2 diabetes mellitus (DM) which constitutes an important risk factor for TB development. The worse scenario of patients with PTB and DM may be partly related to a more unbalanced defensive response. As such, newly diagnosed PTB patients with DM (TB+DM, n = 11) or not (TB, n = 21), as well as DM (n = 18) patients and pair matched controls (Co, n = 22), were investigated for the circulating immuno-endocrine-metabolic profile (ELISA), along with studies in peripheral blood mononuclear cells (PBMC) analyzing transcript expression (RT-qPCR) of mediators involved in glucocorticoid functionality. Given the hyperglycemic/hypercortisolemic scenario of TB+DM patients, PBMC were also exposed to stress-related cortisol concentrations (0.1 and 1 őľM) and supraphysiologic glucose doses (10, 20, and 40 mM) and assessed for the specific response against Mtb stimulation (lymphoproliferation, -thymidine incorporation-, and cytokine production -bead-cytometry). All TB patients displayed increased plasma amounts of cortisol, growth hormone -hGH-, and proinflammatory mediators. In turn, TB+DM showed even higher levels of interferon gamma -IFN-ő≥- and hGH (vs. TB), or IL-6, C reactive protein, cortisol and hGH (vs. DM). Both DM groups had equally augmented values of IL-10. All TB patients showed decreased dehydroepiandrosterone- sulfate concentrations, even more in TB+DM cases. Leptin was also decreased in both TB cases, particularly in the TB group, revealing a lower body mass index, as well. Unlike PBMC from TB cases showing a decreased relationship between the glucocorticoids receptor (GR) isoforms (GRőĪ/GRő≤; functional isoform/negative isoform), cells from TB+DM patients had no changes in this regard, along with an increased expression of 11-beta hydroxysteroid dehydrogenase type-1, the enzyme facilitating intracellular cortisone to cortisol conversion. TB+DM patients also showed an increased Mtb antigen-driven lymphoproliferation. Compared to TB, DM and HCo counterparts, PBMC from TB+DM patients had a biased Th1 response to Mtb stimulation (increased IL-2 and IFN-ő≥ production), even when exposed to inhibitory cortisol doses. TB+DM patients show a more unbalanced immuno-endocrine relationship, respect the non-diabetic counterparts, with a relative deficiency of cortisol immunomodulatory influences, despite their more favorable microenvironment for cortisol-mediated immune effects.Fil: Fern√°ndez, Roc√≠o del Valle. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - Rosario. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario. Universidad Nacional de Rosario. Facultad de Ciencias M√©dicas. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario; ArgentinaFil: D√≠az, Ariana. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - Rosario. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario. Universidad Nacional de Rosario. Facultad de Ciencias M√©dicas. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario; ArgentinaFil: Bongiovanni, Bettina. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - Rosario. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario. Universidad Nacional de Rosario. Facultad de Ciencias M√©dicas. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario; ArgentinaFil: Gallucci, Georgina Florencia. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - Rosario. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario. Universidad Nacional de Rosario. Facultad de Ciencias M√©dicas. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario; ArgentinaFil: B√©rtola, Diego. Universidad Nacional de Rosario; ArgentinaFil: Garde√Īez, Walter. Universidad Nacional de Rosario; ArgentinaFil: Lioi, Susana. Hospital Provincial del Centenario; ArgentinaFil: Bertolin, Y√©sica. Hospital Provincial del Centenario; ArgentinaFil: Galliano, Romina. Hospital Provincial del Centenario; ArgentinaFil: Bay, Maria Luisa. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - Rosario. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario. Universidad Nacional de Rosario. Facultad de Ciencias M√©dicas. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario; ArgentinaFil: Bottasso, Oscar Adelmo. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - Rosario. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario. Universidad Nacional de Rosario. Facultad de Ciencias M√©dicas. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario; ArgentinaFil: D'attilio, Luciano David. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Conicet - Rosario. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario. Universidad Nacional de Rosario. Facultad de Ciencias M√©dicas. Instituto de Inmunolog√≠a Clinica y Experimental de Rosario; Argentin

    A single polyploidization event at the origin of the tetraploid genome of Coffea arabica is responsible for the extremely low genetic variation in wild and cultivated germplasm

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    The genome of the allotetraploid species Coffea arabica L. was sequenced to assemble independently the two component subgenomes (putatively deriving from C. canephora and C. eugenioides) and to perform a genome-wide analysis of the genetic diversity in cultivated coffee germplasm and in wild populations growing in the center of origin of the species. We assembled a total length of 1.536 Gbp, 444‚ÄČMb and 527‚ÄČMb of which were assigned to the canephora and eugenioides subgenomes, respectively, and predicted 46,562 gene models, 21,254 and 22,888 of which were assigned to the canephora and to the eugeniodes subgenome, respectively. Through a genome-wide SNP genotyping of 736‚ÄČC. arabica accessions, we analyzed the genetic diversity in the species and its relationship with geographic distribution and historical records. We observed a weak population structure due to low-frequency derived alleles and highly negative values of Taijma's D, suggesting a recent and severe bottleneck, most likely resulting from a single event of polyploidization, not only for the cultivated germplasm but also for the entire species. This conclusion is strongly supported by forward simulations of mutation accumulation. However, PCA revealed a cline of genetic diversity reflecting a west-to-east geographical distribution from the center of origin in East Africa to the Arabian Peninsula. The extremely low levels of variation observed in the species, as a consequence of the polyploidization event, make the exploitation of diversity within the species for breeding purposes less interesting than in most crop species and stress the need for introgression of new variability from the diploid progenitors

    Efecto antimicrobiano del extracto crudo oleoso de Rosmarinus Officinalis sobre cepa de Escherichia coli

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    The objective of the research work was to evaluate in vitro the antimicrobial efficacy of the crude oil extract of rosemary(Rosmarinus officinalis) on Escherichia coli. Concentrations were evaluated at 20%, 40%, 60 and 80% in dilution in96.8% ethanol.The MIC was determined by the broth microdilution method, the bacterial inoculum of the strain ATCC 25922 wasactivated in the differential agar for MacConkey Enterobacteria and it was standardized to 0.5 of the MacFarland scale inspectrophotometer, having as a result that the 60% tube and 80% oil extract of rosemary did not present turbidity, whichwhen planted on Mueller-Hinton agar determined the MBC in which no colony growth was observed.The measurement of the inhibition rings formed from the OXOID disks impregnated with the concentrations of therosemary oil extract plus the 70% ethanol solvent was carried out and it was concluded that the 60% and 80% oil extracthad the highest antibacterial effect when forming halos of 9.10 mm and 10.90 mm respectively.El trabajo de investigación tuvo como objetivo evaluar in vitro la eficacia antimicrobiana del extracto oleoso crudo deromero (Rosmarinus officinalis L.) sobre Escherichia coli. Se evaluaron concentraciones al 20%, 40%, 60 y 80% endilución en etanol al 70%.Se determinó la CIM mediante el método de microdilución en caldo, el inóculo bacteriano de la cepa ATCC 25922 seactivó en el agar diferencial para Enterobacterias MacConkey y se la estandarizó al 0.5 de la escala de MacFarland enespectrofotómetro, teniendo como resultado que el tubo al 60% y 80% de extracto oleoso de romero no presentaronturbidez, los cuales al ser sembrados en agar Mueller-Hinton determinó la CMB en la que no se observó crecimiento decolonias.Se realizó la medición de los halos de inhibición formados a partir de los discos OXOID impregnados con las concentraciones del extracto oleoso de romero más etanol y se concluye que el extracto oleoso al 60% y 80% presentaron el mayorefecto antibacteriano al formar halos de 9.10 mm y 10.90 mm respectivament
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