X(3872) and its Partners in the Heavy Quark Limit of QCD

In this letter, we propose interpolating currents for the X(3872) resonance, and show that, in the Heavy Quark limit of QCD, the X(3872) state should have degenerate partners, independent of its internal structure. Magnitudes of possible I=0 and I=1 components of the X(3872) are also discussed.Comment: 12 page

Intervención sobre la suma mediante el uso combinado de regletas y TIC’s

Se trata de una investigación empírico-cuantitativa que pretende comprobar que las claves de Driver y Bell (1986) sobre aprendizaje manipulativo y significativo son efectivas para el aprendizaje de la suma en alumnos de 4º de Primaria que presentan dificultades de aprendizaje (Radatz, 1979, 1980). Esta intervención se realizó en el último semestre del curso 2014/2015 en el colegio de la Asunción de Ponferrada. El grupo-clase está formado por 25 alumnos (14 niñas y 11 niños) de 4º de Primaria en donde se aprecia en general déficit de atención, acentuado en tres alumnos, uno de ellos diagnosticado

On the physiological significance of alternative splicing events in higher plants

Alternative splicing, which generates multiple transcripts from the same gene and potentially different protein isoforms, is a key posttranscriptional regulatory mechanism for expanding proteomic diversity and functional complexity in higher eukaryotes. The most recent estimates, based on whole transcriptome sequencing, indicate that about 95 % of human and 60 % of Arabidopsis multi-exon genes undergo alternative splicing, suggesting important roles for this mechanism in biological processes. However, while the misregulation of alternative splicing has been associated with many human diseases, its biological relevance in plant systems is just beginning to unfold. We review here the few plant genes for which the production of multiple splice isoforms has been reported to have a clear in vivo functional impact. These case studies implicate alternative splicing in the control of a wide range of physiological and developmental processes, including photosynthetic and starch metabolism, hormone signaling, seed germination, root growth and flowering, as well as in biotic and abiotic stress responses. Future functional characterization of alternative splicing events and identification of the transcripts targeted by major regulators of this versatile means of modulating gene expression should uncover the breadth of its physiological significance in higher plants.FCT fellowship: (SFRH/BPD/80073/2011); Programa Ciência (QREN/MCTES)

What do shrimper trawlers fish in North West Africa? The issue of discards

In compliance with the Regulation ( 2017 1004 of the European Parliament and of the Council of 17 May 2017 on the establishment of a Union framework for the collection, management and use of data in the fisheries sector and support for scientific advice regarding the common fisheries policy (Data Collection Framework, DCF), Spain performs a monitoring program through scientific observations onboard the Spanish shrimper fishery operating in Mauritanian waters.The Spanish shrimper trawlers fishing off Mauritanian waters usually alternate the use of two different gears, depending on the target species. Outriggers are used to fish Parapenaeus longirostris and Penaeus notialis usually during daylight hauls and the classic bottom otter trawl with trawl doors baka type) is employed for a deeper fishery, especially targeting Aristeus varidens These last deep hauls are usually made at night. This fishery is characterized by capturing a great diversity of species three target species, other retained species and a significant amount of species that end up back in the sea, discard

Extinction time in growth models subject to binomial catastrophes

Populations are often subject to catastrophes that cause mass removal of individuals. Many stochastic growth models have been considered to explain such dynamics. Among the results reported, it has been considered whether dispersion strategies, at times of catastrophes, increase the survival probability of the population. In this paper, we contrast dispersion strategies comparing mean extinction times of the population when extinction occurs almost surely. In particular, we consider populations subject to binomial catastrophes, that is, the population size is reduced according to a binomial law when a catastrophe occurs. Our results show which is the best strategy (dispersion or non-dispersion) depending on model parameter values.Comment: 15 pages, 2 figures. arXiv admin note: substantial text overlap with arXiv:2109.1099

Human immunodeficiency virus type 1 recombinant B/G subtypes circulating in Coimbra, Portugal.

An increasing prevalence of HIV-1 non-B variants is being noticed in several European regions, particularly in countries such as Portugal, which have closer contacts with African endemic areas, where multiple HIV subtypes cocirculate. HIV-1 subtyping by phylogenetic analyses of reverse transcriptase, protease and env (C2-V3) genomic regions was carried out in plasma collected from 18 HIV-1-infected subjects living in Coimbra, Portugal, and suspected to be infected with non-B variants. Three (16.7%) subjects carried recombinant B/G viruses (BV3/BRT/Gpro; GV3/URT/Bpro; AV3/GRT/Bpro), whereas all the remaining individuals were infected with HIV-1 subtype B. This is the first report of recombinant B/G subtypes in Portugal

Clinical manifestations of pandemic (H1N1) 2009 in the ambulatory setting

INTRODUCTION: In June 2009, the World Health Organization declared an influenza pandemic associated with the pandemic (H1N1) 2009 strain. It was summer in the northern hemisphere, and therefore travelling and vacation time, which also provided an increased opportunity for the dissemination of respiratory diseases. METHODOLOGY: We reviewed the paper case report forms from all the patients with influenza-like illnesses with nasopharyngeal samples submitted for laboratory diagnosis of pandemic (H1N1) 2009 infection during the first wave of pandemic influenza that occurred between June and August 2009, in the central region of Portugal. RESULTS: From all the patients with influenza-like illnesses, one third was found positive for pandemic (H1N1) 2009. Individuals under the age of 29 (75%) were the most affected. Most of the patients (91%) presented with fever. A group of symptoms were positively correlated with the probability of pandemic (H1N1) 2009 infection: cough, epistaxis, lack of dyspnea or vomiting, fever, headache and myalgia. CONCLUSIONS: During the first wave of the pandemic influenza, young individuals were the most affected, and in the ambulatory setting, presentation was of a mild febrile illness without complications

Till death (or an intruder) do us part: intrasexual-competition in a monogamous Primate

Polygynous animals are often highly dimorphic, and show large sex-differences in the degree of intra-sexual competition and aggression, which is associated with biased operational sex ratios (OSR). For socially monogamous, sexually monomorphic species, this relationship is less clear. Among mammals, pair-living has sometimes been assumed to imply equal OSR and low frequency, low intensity intra-sexual competition; even when high rates of intra-sexual competition and selection, in both sexes, have been theoretically predicted and described for various taxa. Owl monkeys are one of a few socially monogamous primates. Using long-term demographic and morphological data from 18 groups, we show that male and female owl monkeys experience intense intra-sexual competition and aggression from solitary floaters. Pair-mates are regularly replaced by intruding floaters (27 female and 23 male replacements in 149 group-years), with negative effects on the reproductive success of both partners. Individuals with only one partner during their life produced 25% more offspring per decade of tenure than those with two or more partners. The termination of the pair-bond is initiated by the floater, and sometimes has fatal consequences for the expelled adult. The existence of floaters and the sporadic, but intense aggression between them and residents suggest that it can be misleading to assume an equal OSR in socially monogamous species based solely on group composition. Instead, we suggest that sexual selection models must assume not equal, but flexible, context-specific, OSR in monogamous species.Wenner-Gren Foundation, L.S.B. Leakey Foundation, the National Geographic Society, National Science Foundation (BCS- 0621020), the University of Pennsylvania Research Foundation and the Zoological Society of San Diego, German Science Foundation (HU 1746-2/1

Um Novo Processo para Craqueamento Térmico: Produção de Hidrocarbonetos Com Alto Valor Agregado a Partir de Resíduos de Polietileno

É evidente a grandeza da indústria do petróleo e de seus derivados nos dias atuais. Associado a isso está a enorme variedade de produtos consumidos que são produzidos a partir dos mais diversos tipos de plásticos, gerando uma quantidade considerável de impactos ambientais e sócio-econômicos devido ao seu descarte incorreto e irresponsável. Nesse contexto, o presente estudo tem como objetivo propor um novo processo de conversão térmica, como alternativa, para transformá-los em um possível combustível. As análises elementares detectaram somente quantidades de carbono e hidrogênio. Nas análises imediatas, devido a não existência de normas para testes padrão, somente foram determinadas as quantidades de umidade e cinzas, sendo o material volátil obtido por diferença. O poder calorífico superior das amostras verificadas foi entre 31 49 MJ kg-1. Foram realizados ensaios de Termogravimetria (TG) entre 30 700 °C, com três taxas de aquecimento (2, 20 e 100 K min-1) em duas atmosferas, inerte (N2) e oxidante (ar), e também de Calorimetria diferencial de varredura (CDV) entre 20 600 °C, sob atmosfera dinâmica de nitrogênio e taxa de aquecimento de 10 K min-1. Os resultados mostram concordância com a análise imediata, para cinzas e umidade. Os teores de carbono fixo e material volátil foram determinados através de balanço de massa, confrontando os resultados das análises realizadas. A partir dos dados obtidos nas CDVs, os parâmetros cinéticos de Arrhenius, energia de ativação aparente e o fator pré-exponencial, para a reação global de pirólise foram calculados. O craqueamento térmico de resíduos de polietileno foi realizado de duas maneiras distintas, por meio do uso de energia elétrica e também através de combustão smoldering, onde uma análise de parâmetros foi realizada. Os produtos recuperados foram analisados e um alto poder calorífico foi encontrado. Devido a grande quantidade de material volátil, o uso de resíduos de materiais plásticos sugere a co-gasificação com material carbonoso para atingir as temperaturas de pirólise e garantir a sustentação energética do processo. Palavras chave: Análises térmicas, Combustão, Craqueamento, Plásticos, Resíduos

Sistematización de la implementación de la cátedra de la paz en la zona norte del Departamento del Valle del Cauca, en el año 2015

Este documento constituye la sistematización de la experiencia de implementación de la Cátedra de la paz en las instituciones educativas públicas de la zona norte del Valle del Cauca. Tiene por propósito descifrar el sentido que los maestros (as) dieron a tal experiencia, una estrategia de política educativa en Construcción de paz, a propósito del acuerdo logrado entre la guerrilla de las FARC y el Estado colombiano, hecho histórico que representa un desafío a la educación en su misión de contribuir a la construcción de una cultura democrática para una convivencia en paz. Desde una reflexión teórica sobre la educación para la paz que reconociéndose crítica y situada en contexto latinoamericano, recurre a la posibilidad de aportar a la construcción de una episteme en política pública para la paz, en clave poscolonial e intercultural, construida sobre la base de un conocimiento desde la solidaridad y los afectos. Instalados en esta perspectiva teórica se realiza la reconstrucción de la experiencia, narrativa de doce jornadas, luego de la cual se da la discusión de la que emergen los aspectos fundamentales que se revelan potenciadores y pertinentes para una educación para la paz en una sociedad que hace el tránsito hacia el postconflicto.MaestríaMAGISTER EN POLÍTICAS PÚBLICA