Aysheaia prolata from the Wheeler Formation (Cambrian, Drumian) is a frontal appendage of the radiodontan Stanleycaris

Aysheaia prolata Robison, 1985, was described as the only lobopodian from the Cambrian (Drumian) Wheeler Formation in Utah, and the sole representative of this genus besides the type species Aysheaia pedunculata, from the Cambrian (Stage 5) Stephen Formation, British Columbia. A redescription of Aysheaia prolata reveals previously overlooked morphological features, including segmental boundaries between putative lobopods, and curved terminal spines on the putative anterior end. These observations undermine lobopodian affinities of Aysheaia prolata, and instead we interpret this specimen as an isolated radiodontan frontal appendage. The presence of 11 podomeres, five of which possess elongate and anteriorly recurved ventral blades with auxiliary spines, together with shorter robust dorsal spines, identify the specimen as Stanleycaris Caron et al., 2010. This represents the first report of Stanleycaris outside of the Cambrian (Stage 5) thin Stephen Formation in British Columbia, expanding its palaeobiogeographic and stratigraphic range. Aysheaia is left as a monotypic genus endemic to the Burgess Shale. The Spence Shale luolishaniid Acinocrinus stichus is currently the only lobopodian known from the Cambrian of Utah

First Record Along The Uruguayan Coast Of The Largest Sea Nettle Jellyfish, Chrysaora Plocamia (lesson, 1830) (cnidaria: Scyphozoa)

Chrysaora plocamia is one of the 15 species of the jellyfish genus Chrysaora. This species has an unusualdistribution pattern, occurring on both Atlantic and Pacific coasts of South America. It is distributed along the southeastern Pacific Ocean, encompassing coastal areas of Peru and Chile, and reaching the Patagonian coast of Argentina in the southwestern Atlantic. During two separate events, two large specimens of Chrysaora were collected on the east coast of Uruguay at La Paloma. Based on morphology and molecular data, these specimens were identified as Chrysaora plocamia. These records are described along with oceanographic features observed at that time. Unusual oceanographic and atmospheric conditions may explain the presence of these specimens 1,100 km north of the current northernmost known distribution. © 2016 Check List and Authors.12

Dinámicas socioecológicas y ecoturismo comunitario: Un análisis comparativo en el eje fluvial Guayabero-Guaviare

The effects of the ecotourism in the relationships between inhabitants and their environment are complex and multidimensional. To explore these effects, two community ecotourism initiatives in the Guaviare Province were comparatively analyzed. This territory has been historically affected by the armed conflict and today is given priority as a scenery for the peace construction. The analysis herein articulates approaches both from the political ecology and the socio-ecological systems and considers how important it is to understand the power relations emerging in community ecotourism contexts that, in turn, help to measure how this kind of tourism impacts the socio-ecological dynamics and the strategies by the peasant families who try to diversify their economies to made them sustainable. © 2018, Pontificia Universidad Javeriana. All rights reserved

Low Background Micromegas in CAST

Solar axions could be converted into x-rays inside the strong magnetic field of an axion helioscope, triggering the detection of this elusive particle. Low background x-ray detectors are an essential component for the sensitivity of these searches. We report on the latest developments of the Micromegas detectors for the CERN Axion Solar Telescope (CAST), including technological pathfinder activities for the future International Axion Observatory (IAXO). The use of low background techniques and the application of discrimination algorithms based on the high granularity of the readout have led to background levels below 10$^{-6}$ counts/keV/cm$^2$/s, more than a factor 100 lower than the first generation of Micromegas detectors. The best levels achieved at the Canfranc Underground Laboratory (LSC) are as low as 10$^{-7}$ counts/keV/cm$^2$/s, showing good prospects for the application of this technology in IAXO. The current background model, based on underground and surface measurements, is presented, as well as the strategies to further reduce the background level. Finally, we will describe the R&D paths to achieve sub-keV energy thresholds, which could broaden the physics case of axion helioscopes.Comment: 6 pages, 3 figures, Large TPC Conference 2014, Pari

Satisfacción de los internos de centros penitenciarios con el programa deportivo educativo de baloncesto desarrollado por la Fundación Real Madrid

El deporte y la actividad física tienen, cada vez más, un papel muy importante en la vida de los centros penitenciarios, siendo usados, normalmente, con el fin de favorecer el proceso de reinserción de los reclusos. En este sentido, los objetivos de este trabajo fueron: analizar el grado de satisfacción de los internos de los centros penitenciarios con el programa deportivo educativo de baloncesto llevado a cabo por la Fundación Real Madrid, y destacar los resultados más relevantes de la aplicación del mismo. Con este n, se administró un cuestionario a 267 reclusos de un total de 21 centros penitenciarios de España. Entre los resultados más destacados, sobresale el hecho de que, en general, los encuestados estaban muy satisfechos con el programa deportivo educativo llevado a cabo. Además, los datos hallados manifestaron que la gran mayoría de los internos consideraban que habían aprendido mucho en relación con la actividad deportiva desarrollada (baloncesto) y con los valores educativos trabajados.

Asistencia pediátrica dental: ¿cumplen las familias?

Antecedentes: la pediatría preventiva ha demostrado ser uno de los pilares imprescindibles para mantener el nivel de bienestar en la infancia. No obstante, aún encontramos ciertos campos que no parecen estar lo suficientemente evaluados, como por ejemplo, el estado dental de los pacientes pediátricos. La primera visita al dentista, un hecho fundamental para controlar el correcto crecimiento y estado del aparato estomatológico, no suele estar reglada por los pediatras, quedando en muchas ocasiones a la voluntad de los padres la edad a la cual llevan a sus hijos al dentista. Este pequeño estudio deviene novedoso puesto que no existen muchas publicaciones que indaguen en los factores sociales que llevan a un paciente pediátrico a acudir por primera vez al dentista. Objetivos: estudiamos una muestra de pacientes en edad pediátrica de nuestro medio y pretendemos averiguar si un factor social, como el número de hijos que tiene una familia, puede influir en el hecho de acudir por primera vez al especialista estomatológico. Material y método: se recogen datos de todos los pacientes pediátricos de edades comprendidas entre los 1 y los 12 años que acuden a la Clínica Dental Pérez Colomina entre los años 2016 y 2017. Dicha clínica, en funcionamiento desde hace 25 años en el núcleo urbano de la ciudad de Zaragoza, se puede considerar como un centro que cuenta con una muestra representativa de la atención pediátrica puesto que en ella se atienden a niños procedentes tanto del sistema público de atención bucodental infantil y juvenil (PABIJ), como de mutualistas de la administración pública, así como de otras compañías concertadas y privadas. En la encuesta se recogen entre otros datos, la edad a la que el paciente pediátrico acude por primera vez al dentista, así como el número de hermanos que presenta. Resultados: del total de hijos únicos, a los cuatro años un 28,55% de los hijos ha acudido al dentista, mientras que un 80,48% ya ha acudido al menos una vez a la edad de seis años. Del total de hijos con hermanos, a los cuatro años un 42,5% de los hijos ha ido al dentista, al tiempo que un 89,89% ya ha acudido a la consulta dental al menos una vez a la edad de seis años. Conclusiones: llama la atención que los pacientes pediátricos con hermanos son llevados a la consulta dental antes que los hijos únicos, hecho que puede ser motivado porque al tratar de atender las necesidades odontológicas de un hijo, se aprovecha para controlar al resto de los niños que componen la familia. Deberían realizarse más investigaciones al respecto que ayuden a fomentar el control estomatológico tanto por parte de los pediatras como de los padres. Background: Preventive pediatrics has proven to be one of the essential pillars to maintain the level of well-being in childhood. However, we still find certain fields that do not seem to be sufficiently evaluated, such as the dental status of pediatric patients. The first visit to the dentist, a fundamental fact to control the proper growth and state of the stomatological apparatus, is not usually regulated by the pediatricians, leaving many times at the will of the parents the age at which they take their children to the dentist. This small study becomes novel since there are not many publications that investigate the social factors that lead a pediatric patient to visit the dentist for the first time. Objectives: We studied a sample of pediatric patients in our environment and we intend to find out if a social factor, such as the number of children a family has, may influence the fact of going to the stomatologic specialist for the first time. Material and method: data are collected from all pediatric patients between the ages of 1 and 12 who attend the Pérez Colomina Dental Clinic between 2016 and 2017. This clinic has been in operation for 25 years in the urban area of the city of Zaragoza, can be considered as a center that has a representative sample of pediatric care since it caters to children from both the public system of oral care for children and youth (PABIJ), as well as mutualists of the public administration and other companies concerted and private. The survey includes, among other data, the age at which the pediatric patient comes to the dentist for the first time, as well as the number of siblings he presents. Results: Of the total of only children, at four years, 28.55% of the children went to the dentist, while 80.48% had attended at least once at the age of six. Of the total of children with siblings, at four years 42.5% of the children went to the dentist, while 89.89% had already gone to the dental office at least once at the age of six. Conclusions: It is striking that pediatric patients with siblings are taken to the dental office before the only children, a fact that may be motivated because when trying to attend to the dental needs of a child, it is used to control the rest of the infants that make up the family. More research should be done in this regard to help promote stomatological control by both pediatricians and parents

Interactions between wear and corrosion on cast and sintered Ti-12Nb alloy in comparison with the commercial Ti-6Al-4V alloy

This work investigates the corrosion and tribocorrosion behavior of alpha + beta Ti-12Nb alloy processed by casting and sintering, in 9 g/l NaCl solution at body temperature, and compares the results with the commercial Ti-6Al-4 V alloy. Different electrochemical techniques were used to access the corrosion behavior. Tribocorrosion behavior was studied at open circuit potential under continuous and intermittent sliding, and at anodic potentiostatic condition under continuous sliding. Results revealed that Ti-12Nb alloys presented similar tribocorrosion behavior although the sintered one exhibited a better corrosion behavior. Nevertheless, Ti-6Al-4 V presented better overall degradation resistance than both Ti-12Nb alloys.- This work was supported by FCT national funds, under the national support to R&D units grant, through the reference project UIDB/04436/2020 and UIDP/04436/2020, together with M-ERA-NET/0001/2015, and co-supported by Brazilian agencies CNPq [grants #308.204/2017-4 and #125.954/2018-2] and FAPESP M-ERA-NET [grant #2015/50.280-5], also by MINECO (Spain) through the program PCIN-2016-123 and the Ramon y Cajal project RYC-2014-15014. I. Caha is grateful for a PhD grant under the NORTE-08-5369-FSE-000012 project

Rotational Surfaces in L3\mathbb{L}^3 and Solutions in the Nonlinear Sigma Model

The Gauss map of non-degenerate surfaces in the three-dimensional Minkowski space are viewed as dynamical fields of the two-dimensional O(2,1) Nonlinear Sigma Model. In this setting, the moduli space of solutions with rotational symmetry is completely determined. Essentially, the solutions are warped products of orbits of the 1-dimensional groups of isometries and elastic curves in either a de Sitter plane, a hyperbolic plane or an anti de Sitter plane. The main tools are the equivalence of the two-dimensional O(2,1) Nonlinear Sigma Model and the Willmore problem, and the description of the surfaces with rotational symmetry. A complete classification of such surfaces is obtained in this paper. Indeed, a huge new family of Lorentzian rotational surfaces with a space-like axis is presented. The description of this new class of surfaces is based on a technique of surgery and a gluing process, which is illustrated by an algorithm.Comment: PACS: 11.10.Lm; 11.10.Ef; 11.15.-q; 11.30.-j; 02.30.-f; 02.40.-k. 45 pages, 11 figure

Search for a W' boson decaying to a bottom quark and a top quark in pp collisions at sqrt(s) = 7 TeV

Results are presented from a search for a W' boson using a dataset corresponding to 5.0 inverse femtobarns of integrated luminosity collected during 2011 by the CMS experiment at the LHC in pp collisions at sqrt(s)=7 TeV. The W' boson is modeled as a heavy W boson, but different scenarios for the couplings to fermions are considered, involving both left-handed and right-handed chiral projections of the fermions, as well as an arbitrary mixture of the two. The search is performed in the decay channel W' to t b, leading to a final state signature with a single lepton (e, mu), missing transverse energy, and jets, at least one of which is tagged as a b-jet. A W' boson that couples to fermions with the same coupling constant as the W, but to the right-handed rather than left-handed chiral projections, is excluded for masses below 1.85 TeV at the 95% confidence level. For the first time using LHC data, constraints on the W' gauge coupling for a set of left- and right-handed coupling combinations have been placed. These results represent a significant improvement over previously published limits.Comment: Submitted to Physics Letters B. Replaced with version publishe