Erratum: Virial coefficients and demixing in the Asakura-Oosawa model (vol 142, 014902, 2015)

© 2015 AIP Publishing LLCDepto. de Estructura de la Materia, Física Térmica y ElectrónicaFac. de Ciencias FísicasTRUEpu

Estimating the time-dependent performance of nanocatalysts in fuel cells based on a cost-normalization approach

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESResearchers have developed new catalysts for fuel cells (FC), whose performances are compared after applying different normalization procedures. However, there is not a standard procedure. The current produced from CO electrooxidation was compared for Pt4271119801988CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES454516/2014-2SEM INFORMAÇÃOThe authors acknowledge financial assistance from CNPq (grant No. 454516/2014-2), FUNDECT (grant No. 026/2015), CAPES and FINE

Spread of the alien bleak Alburnus alburnus (Linnaeus, 1758) (Actinopterygii, Cyprinidae) in the Iberian Peninsula: the role of reservoirs

Desde su aparición en un afluente de la cuenca del Ebro en 1992, el alburno Alburnus alburnus se ha expandido en gran parte de la península Ibérica. El presente trabajo aporta nueva información sobre su expansión (basada en el muestreo de 598 localidades mediante pesca eléctrica). Se facilita información detallada sobre su actual distribución en la cuenca del Ebro y en cuencas al este de los Pirineos, así como nuevas citas de tres grandes cuencas hidrográficas. De acuerdo a su actual distribución en la península Ibérica, el alburno habita en simpatría con 15 especies endémicas (el 58% del total de endemismos ibéricos). Se analiza la posible amenaza que el alburno representa para la ictiofauna ibérica, examinando los factores causantes de su rápida expansión, en especial el papel de los embalses

Primary dispersal of Cytisus multiflorus seeds

Current work relates to the primary dispersal of Cytisus multiflorus seeds: seed production, dispersal mechanisms, distribution of seed after dissemination and dormancy were investigated. The distribution of seed was recorded before collection; seed viabilaty and dormancy were assessed. The results indicate that the dispersion is assisted by an explosive dehiscence of the seed pod in that only 35% of the seed drop directly beneath the plant, the remainder falling further away, some reaching distances greater than 3 m. Dormancy index was found to be 98.9%.[es] En el presente trabajo se estudia la dispersión primaria de las semillas de Cytisus multiflorus: cuantificación de la producción, mecanismos de dispersión, distribución de las semillas tras la diseminación, y su estado de latencia. Para ello se colocaron dispositivos de recogida de las semillas debajo y alrededor de las plantas, anotando la cantidad y distancia de la calda; posteriormente eran sembradas para comprobarla viabilidad y dormición de las semillas. Los resultados indican la existencia de una dispersión por dehiscencia explosiva; solamente el 35% de las semillas caen bajo la planta, haciéndolo el resto en sus alrededores; algunas alcanzaron distancias superiores a los 3 m. El índice de dormición es de 98.9%. [fr] Dans le présent travail on étudie la dispersion primaire des graines de Cytisus multiflorus: quantification de la production, mécanismes de dispersion, distribution des graines après la dissémination et leur état de latence. Pour ce faire on a placé des dispositifs de récolte des graines au dessous et autour des plantes, enregistrant la quantité et la distance de la chute; après elles étaient semées pour tester la viabilité et dormance des graines. Les résultats indiquent l'existence d'une dispersion par déhiscence explosive; seulement 35% des graines tombent au-dessous de la plante, et le reste dans les alentours; quelques-unes atteignent des distances supérieures à 3 m. L'index de dormition est de 98.9%

Reliability of the resonance frequency analysis values in new prototype transepithelial abutments: A prospective clinical study

Resonance frequency analysis (RFA) requires abutment disconnection to monitor implant stability. To overcome this limitation, an experimental transepithelial abutment was designed to allow a SmartPeg to be screwed onto it, in order to determine the prototype abutments repeatability and reproducibility using Osstell ISQ and to assess whether implant length and diameter have an influence on the reliability of these measurements. RFA was conducted with a SmartPeg screwed directly into the implant and onto experimental abutments of different heights of 2, 3.5 and 5 mm. A total of 32 patients (116 implants) were tested. RFA measurements were taken twice for each group from mesial, distal, buccal and palatal/lingual surfaces. Mean values and SD were calculated and Intraclass Correlation Coefficients (ICC) (p < 0.05, IC 95%). The implant stability quotient (ISQ) mean values were 72.581 measured directly to implant and 72.899 (2 mm), 72.391 (3.5 mm) and 71.458 (5 mm) measured from the prototypes. ICC between measurements made directly to implant and through 2-, 3.5-and 5-mm abutments were 0.908, 0.919 and 0.939, respectively. RFA values registered through the experimental transepithelial abutments achieved a high reliability. Neither the implant length nor the diameter had any influence on the measurements’ reliability

Visiones del Profesorado de Primaria sobre Materiales Didácticos Digitales

This article discusses the perceptions of fifth and sixth Primary school teachers about the assessment, use and training of teachers on Digital Didactic Materials (hereinafter MDD). For this purpose, semi-structured interviews have been conducted with teachers from three Autonomous Communities (Galicia, Canarias and Valencia). In this qualitative work the results show that teachers consider it necessary to use this type of resources in the classroom since they are very present in the daily life of the students. They also advocate the creation of their own materials in order to adapt them to the particular characteristics of the group-class, providing a proposal of contextualized teaching and learning. As major difficulties in the design of digital materials, teachers point to the short lifespan of MDD as they must be continuously updated, the amount of time they need to develop them as well as technical limitations to achieve an attractive, coherent and functional end resource. We are dealing with complex work, so there is a need to continue to investigate the perspectives of teachers in the creation and use of MDD in Primary Education

Perceptions of primary teachers on digital didactic materials

En este artículo se analizan las percepciones del profesorado de quinto y sexto de educación Primaria en torno a la valoración, uso y formación del profesorado sobre Materiales Didácticos Digitales (en adelante MDD). Para ello se han realizado entrevistas semiestructuradas a docentes de tres Comunidades Autónomas (Galicia, Canarias y Valencia). En este trabajo de corte cualitativo los resultados manifiestan que el profesorado considera necesario utilizar en las aulas este tipo de recursos ya que están muy presentes en la vida cotidiana del alumnado. Asimismo, abogan por la creación de sus propios materiales con el fin de adaptarlos a las características particulares del grupo-clase, proporcionando una propuesta de enseñanza y aprendizaje contextualizada. Como principales dificultades en el diseño de materiales digitales, los docentes señalan la corta vida útil que poseen los MDD ya que continuamente deben ser actualizados, la cantidad de tiempo que necesitan para elaborarlos, así como limitaciones técnicas para conseguir un recurso final atractivo, coherente y funcional. Estamos ante un trabajo complejo por lo que es preciso seguir indagando en las perspectivas del profesorado en la creación y uso de los MDD en educación PrimariaThis article discusses the perceptions of fifth and sixth Primary school teachers about the assessment, use and training of teachers on Digital Didactic Materials (hereinafter MDD). For this purpose, semi-structured interviews have been conducted with teachers from three Autonomous Communities (Galicia, Canarias and Valencia). In this qualitative work the results show that teachers consider it necessary to use this type of resources in the classroom since they are very present in the daily life of the students. They also advocate the creation of their own materials in order to adapt them to the particular characteristics of the group-class, providing a proposal of contextualized teaching and learning. As major difficulties in the design of digital materials, teachers point to the short lifespan of MDD as they must be continuously updated, the amount of time they need to develop them as well as technical limitations to achieve an attractive, coherent and functional end resource. We are dealing with complex work, so there is a need to continue to investigate the perspectives of teachers in the creation and use of MDD in Primary Educatio

Damage-responsive neuro-glial clusters coordinate the recruitment of dormant neural stem cells in Drosophila.

Recruitment of stem cells is crucial for tissue repair. Although stem cell niches can provide important signals, little is known about mechanisms that coordinate the engagement of disseminated stem cells across an injured tissue. In Drosophila, adult brain lesions trigger local recruitment of scattered dormant neural stem cells suggesting a mechanism for creating a transient stem cell activation zone. Here, we find that injury triggers a coordinated response in neuro-glial clusters that promotes the spread of a neuron-derived stem cell factor via glial secretion of the lipocalin-like transporter Swim. Strikingly, swim is induced in a Hif1-α-dependent manner in response to brain hypoxia. Mammalian Swim (Lcn7) is also upregulated in glia of the mouse hippocampus upon brain injury. Our results identify a central role of neuro-glial clusters in promoting neural stem cell activation at a distance, suggesting a conserved function of the HIF1-α/Swim/Wnt module in connecting injury-sensing and regenerative outcomes