Diving lice: The exception to the rule that there are no insects in the (deep) ocean

Insects are present in virtually all possible habitats on the mainland but virtually absent in the ocean which constitutes 90% of the biosphere. Only a few species are present in the sea, but remaining at the surface, salt marshes, estuaries, or shallow waters. Remarkably, a group of species manages to endure long immersion periods in the open sea, as well as deep dives, i.e. seal lice. We discuss here some of the adaptations that allow seal lice to cope with the amphibious habits of their hosts and how they can help understanding why are insect so rare in the ocean.Fil: Leonardi, María Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto de Biología de Organismos Marinos; ArgentinaFil: Crespo, José Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; ArgentinaFil: Soto, Florencia Anabella. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto de Biología de Organismos Marinos; ArgentinaFil: Lazzari, Claudio R.. Universite de Tours; Francia. Centre National de la Recherche Scientifique; FranciaThe 1st International Electronic Conference on EntomologySuizaInsects JournalMultidisciplinary Digital Publishing Institut

Mixing thermodynamics and photocatalytic properties of GaP-ZnS solid solutions

Preparation of solid solutions represents an effective means to improve the photocatalytic properties of semiconductor-based materials. Nevertheless, the effects of site-occupancy disorder on the mixing stability and electronic properties of the resulting compounds are difficult to predict and consequently many experimental trials may be required before achieving enhanced photocatalytic activity. Here, we employ first-principles methods based on density functional theory to estimate the mixing free energy and the structural and electronic properties of (GaP)x(ZnS)1-x solid solutions, a representative semiconductor-based optoelectronic material. Our method relies on a multi-configurational supercell approach that takes into account the configurational and vibrational contributions to the free energy. Phase competition among the zinc-blende and wurtzite polymorphs is also considered. We demonstrate overall excellent agreement with the available experimental data: (1) zinc-blende emerges as the energetically most favorable phase, (2) the solid solution energy band gap lies within the 2-3 eV range for all compositions, and (3) the energy band gap of the solid solution is direct for compositions x < 75%. We find that at ambient conditions most (GaP)x(ZnS)1-x solid solutions are slightly unstable against decomposition into GaP- and ZnS-rich regions. Nevertheless, compositions x = 25, 50, and 75% render robust metastable states that owing to their favorable energy band gaps and band levels relative to vacuum are promising hydrogen evolution photocatalysts for water splitting under visible light. The employed theoretical approach provides valuable insights into the physicochemical properties of potential solid-solution photocatalysts and offers useful guides for their experimental realization

Zero-lag long-range synchronization via hippocampal dynamical relaying

2 páginas, 1 figura.-- Póster presentado al Nineteenth Annual Computational Neuroscience Meeting: CNS*2010 San Antonio, TX, USA; 24-30 July 2010.Peer reviewe

Kissing molars extraction: case series and review of the literature

Kissing molars are a very rare form of inclusion defined as molars included in the same quadrant, with occlusal surfaces contacting each other within a single dental follicle. We present four cases of this pathology: a 35 year-old male, referred to the Oral and Maxillofacial Surgery Department of the Hospital Virgen del Rocio in Seville, and three females of 24, 26, and 31 years, all of which had kissing molars that were treated by tooth extraction. We have found only 10 cases published in the medical literature in which this type of inclusion is briefly described, none of which elaborate on the surgical technique employed. In these cases, the indication for surgery is established when there is a history of recurring infections or cystic lesions associated with dental inclusions. The extraction of kissing molars requires an exhaustive comprehension of the anatomy of the region involved, sufficiently developed surgical abilities, and an extensive planning proces

La relación del liderazgo educacional con la ciencia-tecnología-sociedad y sus dimensiones/The relationship of educational leadership with science-technology-society and its dimensions

Los directores de las instituciones educativas poseen insuficiencias en su desempeño que dificultan su influencia consciente sobre sus subordinados. El objetivo de la investigación es valorar la relación del liderazgo educacional con la ciencia, la tecnología y la sociedad desde sus dimensiones. Se tuvieron en cuenta los resultados de excelencia a partir de experiencias prácticas en el desempeño de los directores de escuelas del municipio Morón en Ciego de Ávila, Cuba, en un período de cinco años (2012-2017), además se utilizaron métodos del nivel teórico, empíricos y de procesamiento matemático; se ofrecen conclusiones precisas sobre el proceso de formación del liderazgo en los directores de escuelas

Internal Carotid Artery Reconstruction with a “Mega Flow Diverter”: First Experience with the 6×50 mm DERIVO Embolization Device

Endoluminal reconstruction with a flow diverter device has emerged as a viable and often preferable alternative to traditional techniques for the treatment of intracranial aneurysms. Precise measurement and device selection are mandatory steps when considering flow diverters usage in order to avoid potential complications. In this sense, incomplete wall-apposition has been described as a predictive factor for immediate in-stent and delayed thrombosis after stent use. One significant usage limitation of flow diverter devices is the parent artery diameter, since the maximum opening of the sizes available are recommended for vessel diameters between 5.2–5.75 mm. Here we present the first clinical use of the largest flow diverter available, the 6×50 mm DERIVO embolization device (Acandis GmbH & Co. KG, Pforzheim, Germany), into the arterial circulation for a cervical internal carotid artery endovascular reconstruction. This is a new device for large or fusiform aneurysms requiring flow diversion, especially located in the vertebrobasilar system or extracranial segments

Bullying in Brazilian schools: results from the National School-based Health Survey (PeNSE), 2009

O objetivo deste estudo é identificar e descrever a ocorrência do bullying, episódios de humilhação ou provocação perpetrados pelos colegas da escola, entre estudantes do 9º ano do ensino fundamental de escolas públicas e privadas das 26 capitais dos estados brasileiros e do Distrito Federal. Trata-se de estudo transversal feito com 60.973 escolares de 1.453 escolas públicas e privadas. A análise dos dados aponta que 5,4% (IC95%: 5,1%-5,7%) dos estudantes relataram ter sofrido bullying quase sempre ou sempre nos últimos 30 dias; 25,4% (IC95%: 24,8%-26,0%) foram raramente ou às vezes vítimas de bullying e 69,2% (IC95%: 68,5%-69,8%) não sentiram nenhuma humilhação ou provocação (bullying). A capital com maior frequência de foi Belo Horizonte-MG (6,9%; IC95%: 5,9%-7,9) e a menor foi Palmas-TO (3,5%; IC95%: 2,6%-4,5%). Meninos relatam mais bullying (6,0%; IC95%: 5,5%-6,5%) do que meninas (4,8%; IC95%: 4,4%-5,3%). Não houve diferença entre escolas públicas (5,5%; IC95%: 5,1%-5,8%) e privadas (5,2%; IC95%: 4,6%-5,8%), exceto em Aracaju-SE, onde foi registrada maior ocorrência de bullying em escolas privadas. Os dados mostram urgente necessidade de ações intersetoriais a partir de políticas e práticas educativas que efetivem redução e prevenção da ocorrência do bullying nas escolas.The aim of this study is to identify and describe the occurrence of bullying among students in the 9th year (8th grade) from public and private schools from 26 Brazilian state capitals and the Federal District. It is a cross-sectional study involving 60,973 students and 1,453 public and private schools. Data analysis indicates that 5.4% (IC95%: 5.1%-5.7%) of students reported having suffered bullying almost always or always in the last 30 days, 25.4% (IC95%: 24.8%-26.0%) were rarely or sometimes the victim of bullying and 69.2% (IC95%: 68.5%-69.8%) of students felt no humiliation or provocation at school. The capital with higher frequency of bullying was Belo Horizonte (6.9%; IC95%: 5,9%-7,9%), Minas Gerais, and the lowest was Palmas (3.5%; IC95%: 2.6%-4.5%), Tocantins. Boys reported more bullying (6,0%; IC95%: 5.5%-6.5%) compared with girls (4,8%; IC95%: 4.4%-5.3%). There was no difference between public schools 5.5% (IC95%: 5.1%-5.8%) and private (5.2%) (IC95%: 4.6%-5.8%), except in Aracaju, Sergipe, that show more bullying in private schools. The findings indicate an urgent need for intersectoral action from educational policies and practices that enforce the reduction and prevention of the occurrence of bullying in schools in Brazil

Música electroacústica en tiempo real: aproximación técnica y estética en relación a la gestualidad, el espacio y la representación

El empleo del procesamiento en tiempo real en la música electroacústica, tanto en su variante acusmática como en el caso de los medios mixtos, replantea las tensiones ya existentes entre la música aleatoria y de la música electroacústica propiamente dicha: en los casos más radicalizados de la música aleatoria, el grado de libertad del intérprete es tal que la obra misma se redefine en cada nueva versión; en el otro extremo, para la música electroacústica de estudio en cambio, aún cuando se trate de medios mixtos, el margen de variabilidad entre cada versión es muy acotado. Entre los múltiples desafíos que este nuevo género plantea, los problemas vinculados a la gestualidad, el espacio y la representación se imponen como determinantes. Frente a los medios mixtos que incluyen música electroacústica de estudio, en los cuales, por la fijeza de los sonidos electrónicos, se tiende a debilitar y limitar la eficacia del gesto instrumental, el procesamiento electrónico del sonido en tiempo real demanda una resplanteo de la gestualidad interpretativa en un complejo proceso interactivo. El espacio acústico donde se desarrolla una interpretación musical condiciona el resultado sonoro obtenido. Los intérpretes moldean su sonido en función de las respuestas acústicas que un determinado espacio le devuelve; en creaciones recientes es frecuente advertir que el compositor busca incluir cierto grado de flexibilidad en el discurso sonoro electrónico en función de las propiedades acústicas del recinto dónde éste será propagado. Por último, las nuevas tecnologías replantean las dimensiones funcionales de la partitura, su grafía, soporte, complejidad visual, y código. La representación del sonido y su transformación en tiempo real también imponen una problemática que necesita ser estudiada para su uso artísticoFil: Lluán, Claudio. Universidad Nacional de Rosario. Facultad de Humanidades y Artes. Escuela de Música; Argentina.Fil: Data, Gabriel Hugo. Universidad Nacional de Rosario. Facultad de Humanidades y Artes. Escuela de Música; Argentina.Fil: Tamagnini, Luis. Universidad Nacional de Rosario. Facultad de Humanidades y Artes. Escuela de Música; Argentina.Fil: Santi, Sergio. Universidad Nacional de Rosario. Facultad de Humanidades y Artes. Escuela de Música; Argentina.Fil: Perepelycia, Alexis. Universidad Nacional de Rosario. Facultad de Humanidades y Artes. Escuela de Música; Argentina.Fil: Crespo, Alfredo José. Universidad Nacional de Rosario. Facultad de Humanidades y Artes. Escuela de Música; Argentina.Fil: Miechi, Pablo. Universidad Nacional de Rosario. Facultad de Humanidades y Artes. Escuela de Música; Argentina.Fil: Jardón, Guillermo. Universidad Nacional de Rosario. Facultad de Humanidades y Artes. Escuela de Música; Argentina