Resumen multidocumento utilizando teorías semántico-discursivas

El resumen automático tiene por objetivo reducir el tamaño de los textos, preservando el contenido más importante. En este trabajo, proponemos algunos métodos de resumen basados en dos teorías semántico-discursivas: Teoría de la Estructura Retórica (Rhetorical Structure Theory, RST) y Teoría de la Estructura Inter-Documento (Cross-document Structure Theory, CST). Han sido elegidas ambas teorías con el fin de abordar de un modo más relevante de un texto, los fenómenos relacionales de inter-documentos y la distribución de subtopicos en los textos. Los resultados muestran que el uso de informaciones semánticas y discursivas para la selección de contenidos mejora la capacidad informativa de los resúmenes automáticos.Automatic multi-document summarization aims at reducing the size of texts while preserving the important content. In this paper, we propose some methods for automatic summarization based on two semantic discourse models: Rhetorical Structure Theory (RST) and Cross-document Structure Theory (CST). These models are chosen in order to properly address the relevance of information, multi-document phenomena and subtopical distribution in the source texts. The results show that using semantic discourse knowledge for content selection improve the informativeness of automatic summaries

Brazil: tourism, staying afloat

The experience with tourism-based boat trips in Caixa d´Aço Bay in Paraty, Brazil, highlights the problems of livelihoods in restricted-use protected area

Predominance of Rotavirus P[4]G2 in a Vaccinated Population, Brazil

We identified 21 rotaviruses in 129 patients with diarrhea in a Brazilian city with high rotavirus vaccine coverage. All rotaviruses were genotype P[4]G2 with 1 mixed infection with P[NT]G9. Although virus predominance could have occurred randomly, the vaccine may be less protective against P[4]G2. Prospective surveillance is urgently needed

USE OF COMBINATION OF FLUORESCENT PROBES TO IDENTIFY SPERM SUBPOPULATIONS FOR QUALITY ASSESSMENT OF FRESH AND CRYOPRESERVED CANINE SEMEN. PRELIMINARY RESULTS

The use of fluorescent markers in the evaluation of sperm morphophysiology allows a better accuracy, compared to the subjective nature of some routine tests in semen qualification. In this study was used the combination of fluorescence probes: propionate iodide, Hoechst 33342 and FITC-PSA in fresh and thawed dog semen, to the identification of the following morphological subpopulations: II (intact plasma and acrosomal membranes), IL (intact plasma membrane and lesioned acrosomal membrane), LI (lesioned plasma membrane and intact acrosomal membrane) and LL (both membranes lesioned). When comparing the results obtained with the results of the tests used conventionally in semen evaluation (sperm motility and vigor, hypoosmotic test and morphological alterations), little correlation was observed. The II population declined from fresh semen to thawed, while LL population increased (p <0.05). The IL population was composed of extremely small numbers of cells but increased (p <0.05) from fresh semen to thawed semen. In the thawed semen the major defects had a positive correlation with the LL population (p <0.01). For the thawed semen, the results of the hypoosmotic test (number of cells that reacted to the medium) correlated positively with population II (p <0.025), that is, different from that observed in fresh semen. Although all tests were able to detect decrease in sperm quality post-thawing (p <0.05). The use of this fluorescent probe association allowed qualification and more accurately quantification of plasma membrane and acrosomal insults mediated by cryopreservation. El uso de marcadores fluorescentes en la evaluación de la morfofisiología espermática permite una mayor precisión, comparada con la naturaleza subjetiva de algunas pruebas de rutina en la valoración del semen. En este estudio se usó la combinación de pruebas fluorescentes: yoduro de propidio; Hoechst 33342 y FITC-PSA en semen fresco y descongelado de perro, para la identificación de las siguientes subpoblaciones morfológicas: II (membranas plasmática y acrosomal intactas), IL (membrana plasmática intacta y membrana acrosomal dañada), LI (membrana plasmática dañada y membrana acrosomal intacta) y LL (ambas membranas dañadas). Cuando se comparan los resultados obtenidos con los resultados de las pruebas usadas convencionalmente en la evaluación seminal (motilidad y vigor espermáticos, prueba hipoosmótica y alteraciones morfológicas), se observó poca correlación. La población II disminuyó desde el semen fresco al descongelado, mientras que la población LL se incrementó (p<0.05). la población IL estuvo compuesta por un número extremadamente pequeño de células, pero incremento (p<0.05) desde el semen fresco al descongelado. En el semen descongelado los defectos mayores tuvieron una correlación positiva con la población LL (p<0.01). En el semen descongelado, los resultados de la prueba hipoosmótica (número de células que reaccionan al medio) se correlacionaron positivamente con la población II (p<0.05). El uso de esta asociación de pruebas fluorescentes permitió la valoración y la cuantificación más precisa de los daños a la membrana plasmática y acrosomal mediados por la criopreservación.

Predominance of rotavirus P[4]G2 in a vaccinated population, Brazil

We identified 21 rotaviruses in 129 patients with diarrhea in a Brazilian city with high rotavirus vaccine coverage. All rotaviruses were genotype P[4]G2 with 1 mixed infection with P[NT]G9. Although virus predominance could have occurred randomly, the vaccine may be less protective against P[4]G2. Prospective surveillance is urgently needed

Waste-polystyrene foams-derived magnetic carbon material for adsorption and redox supercapacitor applications

The current impact of plastic waste on the environment and nature pushes for coming up with methods for their efficient reuse and recycle. Expanded polystyrene waste, massively produced worldwide, is presented in this work as a novel precursor of magnetic activated carbons (MAC) for the first time. A simple methodology based on the impregnation of EPS samples with Fe3+ in solution, followed by pyrolysis under Ar pressure and chemical activation is proposed. The as-prepared carbonaceous magnetic materials present nanometric phases of Fe0, Fe3C, and Fe3O4, and showed high specific surface area (672 m2 g−1) and total pore volume (0.35 cm3 g−1), one of the highest found in the carbonaceous magnetic materials literature. Their excellent textural, chemical and electrical properties, combined with the possibility of magnetically collection and regeneration after operation guaranteed an excellent performance of MAC in two different applications: as adsorbents of organic contaminants and as electrodes of redox supercapacitors.The authors would like to thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) for the financial support. P.F.R. Ortega acknowledges the FAPEMIG (DOF nº. 2720262/2018). The authors are also grateful to Rede Mineira de Química. R.L. Lavall is recipient of fellowship from CNPq (grant number 313304/2017-3). N. C. F. Machado, K. H. A. Mendes, and L. A. M. de Jesus would like to thank CEFET-MG and FAPEMIG for scholarships receivedPeer reviewe