587 research outputs found
Peatlands in the Toledo Mountains (central Spain): characterisation and conservation status.
We have limited knowledge about the biodiversity and vulnerability of peatlands in the lower-altitude mountains of the Iberian Peninsula, largely because peatlands have not been routinely differentiated from other habitat types in Spain. Understanding is now developing about the ecology of peatlands in central Spain, but they are already under severe threat of conversion and degradation. In this article we describe the results of a field survey and literature review study to characterise and describe the current condition of peatlands in the Toledo Mountains in terms of their typology, the representation of habitat types protected by European (EU) designations, threats, endangered plant species, and conservation status. Our results suggest that the principal threats are overgrazing by domestic animals and ungulates (red deer and wild boar), fire, expansion of cereal crops, drying-out and erosion. Disturbance is most severe in areas that are not protected by nature conservation designations, where peatlands are especially vulnerable to damage arising from human activities
Evaluando la relación entre el consumo televisivo y las actitudes hacia personas viviendo con VIH/sida en Chile
En esta investigación analizamos la relación entre el consumo de televisión y las actitudes frente a las personas que viven con VIH/sida en Chile. Para esto usamos los datos obtenidos en la última ola de la Encuesta Mundial de Valores (EMV) en 2011, la cual cuenta con un n=1000 personas para Chile. Usamos un modelo logístico multinomial, con máxima verosimilitud para nuestro análisis estadístico. Nuestros resultados sugieren que la forma en la que los noticieros manejan información relacionada con el virus de inmunodeficiencia adquirida podría ayudar a reducir la discriminación contra la gente que vive con VIH/sida en el país
Una experiencia autocrítica en el trabajo autónomo de la condición física: opiniones del propio alumnado participante
Asthma diagnosis is not associated with obesity in a population of adults from Madrid
Background: Several studies have suggested a relationship between asthma and obesity; however, this relationship is unclear when obesity
is compared with bronchial hyperresponsiveness to methacholine.
Aim: To determine whether obesity is associated with a diagnosis of asthma.
Methods: We conducted a cross-sectional study in a population of Spanish adults in the north of Madrid, Spain between 2003 and
2007. The patients included had experienced asthma symptoms during the previous year, but had a ratio of forced expiratory volume in
the fi rst second of expiration (FEV1) to forced vital capacity (FVC) of >70%. Diagnosis was confi rmed by the presence of symptoms and
demonstration of bronchial hyperresponsiveness to methacholine. Obesity was measured by body mass index (BMI). Adjusted odd ratios
(OR) were obtained by logistic regression.
Results: Of a total of 1424 patients included, 251 (17.6%) were diagnosed with asthma. These patients were younger (P<.001) and had
lower BMI (P<.001) and lung function parameters (FEV1 and FEV1/FVC ratio) than individuals without asthma (P<.001). After adjusting
the model for age, gender, baseline FEV1, and FEV1/FVC ratio, patients with overweight or obesity were not more frequently diagnosed
with asthma than those with normal weight (OR, 0.848 [95% confi dence interval (CI), 0.59-1.20]; and OR, 0.616 [95% CI, 0.38-0.99],
respectively). In addition, obese males were more frequently diagnosed with asthma than obese females (P<.041).
Conclusions: In this study, obesity and overweight were not associated with a diagnosis of asthma based on the presence of consistent
symptoms and demonstration of airway responsiveness to methacholineFundamento: Varios estudios sugieren que la obesidad es un factor de riesgo para padecer asma, lo que no siempre se confi rma cuando
se compara la obesidad con la hiperreactividad bronquial (HRB) en pacientes con síntomas de asma.
Objetivo: Determinar si la obesidad se asocia con el diagnóstico de asma, confi rmado por presencia de síntomas e HRB a metacolina.
Pacientes y Métodos: Se realizó un estudio transversal en población adulta del Área Norte de Madrid entre 2003 y 2007. Se incluyeron
sujetos que habían padecido síntomas de asma en el último año, con un FEV1/FVC>70% y que precisaban una prueba de metacolina
para confi rmar el diagnóstico. La obesidad se defi nió según el índice de masa corporal (IMC). Se aplicó un modelo de regresión logística
para calcular odd ratios (OR) ajustadas.
Resultados: Se estudiaron 1.424 sujetos y se diagnosticaron de asma 251 sujetos (17,6%) que, comparados con los 1.173 no diagnosticados
de asma, eran más jóvenes y presentaban un IMC y parámetros de función pulmonar (FEV1, FEV1/FVC) más bajos (p<0,001). Tras ajustar
el modelo por edad, sexo, FEV1 basal y FEV1/FVC el diagnóstico de asma no fue más prevalente en los sujetos obesos o con sobrepeso que
en los sujetos con peso normal (OR 0,848, IC95% 0,59-1,20 y OR 0,616, IC95% 0,38-0,99, respectivamente). El diagnóstico de asma
fue más frecuente en hombres obesos que en mujeres obesas (p=0,041).
Conclusiones: La obesidad y el sobrepeso no se asociaron con el diagnóstico de asma establecido por la presencia de síntomas e HRB a
metacolinaThis research project was carried out with a
grant from Fundación para la Investigación Biomédica del
Hospital Universitario La Paz (FIBHULP
Towards Automatic Parallelization of Stream Processing Applications
Parallelizing and optimizing codes for recent multi-/many-core processors have been recognized to be a complex task. For this reason, strategies to automatically transform sequential codes into parallel and discover optimization opportunities are crucial to relieve the burden to developers. In this paper, we present a compile-time framework to (semi) automatically find parallel patterns (Pipeline and Farm) and transform sequential streaming applications into parallel using GrPPI, a generic parallel pattern interface. This framework uses a novel pipeline stage-balancing technique which provides the code generator module with the necessary information to produce balanced pipelines. The evaluation, using a synthetic video benchmark and a real-world computer vision application, demonstrates that the presented framework is capable of producing parallel and optimized versions of the application. A comparison study under several thread-core oversubscribed conditions reveals that the framework can bring comparable performance results with respect to the Intel TBB programming framework
Carcinoma hepatocelular y linfoma folicular en paciente cirrótico por virus de la hepatitis C
El virus de la hepatitis C (VHC) tiene demostrado poder oncogénico. Su asociación con Carcinoma Hepatocelular (CHC) en pacientes con cirrosis hepática es bien conocida como también con el Linfoma no Hodgkin indolente. Es poco frecuente que estas tres entidades se presenten simultáneamente. El objetivo de este reporte es describir la presentación clínica, la metodología diagnóstica y la evolución de un paciente que presentó concomitantemente infección crónica por virus C, cirrosis, hepatocarcinoma y linfoma no Hodgkin.Facultad de Ciencias Médica
Carcinoma hepatocelular y linfoma folicular en paciente cirrótico por virus de la hepatitis C
El virus de la hepatitis C (VHC) tiene demostrado poder oncogénico. Su asociación con Carcinoma Hepatocelular (CHC) en pacientes con cirrosis hepática es bien conocida como también con el Linfoma no Hodgkin indolente. Es poco frecuente que estas tres entidades se presenten simultáneamente. El objetivo de este reporte es describir la presentación clínica, la metodología diagnóstica y la evolución de un paciente que presentó concomitantemente infección crónica por virus C, cirrosis, hepatocarcinoma y linfoma no Hodgkin.Facultad de Ciencias Médica
Complete curvature homogeneous pseudo-Riemannian manifolds
We exhibit 3 families of complete curvature homogeneous pseudo-Riemannian
manifolds which are modeled on irreducible symmetric spaces and which are not
locally homogeneous. All of the manifolds have nilpotent Jacobi operators; some
of the manifolds are, in addition, Jordan Osserman and Jordan Ivanov-Petrova.Comment: Update paper to fix misprints in original versio
Peatlands in the Toledo Mountains (central Spain): characterisation and conservation status
SUMMARY We have limited knowledge about the biodiversity and vulnerability of peatlands in the lower-altitude mountains of the Iberian Peninsula, largely because peatlands have not been routinely differentiated from other habitat types in Spain. Understanding is now developing about the ecology of peatlands in central Spain, but they are already under severe threat of conversion and degradation. In this article we describe the results of a field survey and literature review study to characterise and describe the current condition of peatlands in the Toledo Mountains in terms of their typology, the representation of habitat types protected by European (EU) designations, threats, endangered plant species, and conservation status. Our results suggest that the principal threats are overgrazing by domestic animals and ungulates (red deer and wild boar), fire, expansion of cereal crops, drying-out and erosion. Disturbance is most severe in areas that are not protected by nature conservation designations, where peatlands are especially vulnerable to damage arising from human activities
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