119 resultados para Colomer, Teresa
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Nivel educativo: Grado. Duración (en horas): Más de 50 horas
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El presente trabajo realiza un análisis de las Asociaciones Estratégicas de la Unión Europea. Se tratan de un instrumento de política exterior de la Unión, para hacer frente al nuevo orden mundial. Por ello, el trabajo presenta el sistema internacional actual al que se enfrenta la Unión, analiza las Asociaciones Estratégicas (características, funciones y límites) y realiza un breve análisis de los 10 socios estratégicos con quienes se han establecido dichas asociaciones. El trabajo está redactado en castellano.
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Background: The European mink (Mustela lutreola, L. 1761) is a critically endangered mustelid, which inhabits several main river drainages in Europe. Here, we assess the genetic variation of existing populations of this species, including new sampling sites and additional molecular markers (newly developed microsatellite loci specific to European mink) as compared to previous studies. Probabilistic analyses were used to examine genetic structure within and between existing populations, and to infer phylogeographic processes and past demography. Results: According to both mitochondrial and nuclear microsatellite markers, Northeastern (Russia, Estonia and Belarus) and Southeastern (Romania) European populations showed the highest intraspecific diversity. In contrast, Western European (France and Spain) populations were the least polymorphic, featuring a unique mitochondrial DNA haplotype. The high differentiation values detected between Eastern and Western European populations could be the result of genetic drift in the latter due to population isolation and reduction. Genetic differences among populations were further supported by Bayesian clustering and two main groups were confirmed (Eastern vs. Western Europe) along with two contained subgroups at a more local scale (Northeastern vs. Southeastern Europe; France vs. Spain). Conclusions: Genetic data and performed analyses support a historical scenario of stable European mink populations, not affected by Quaternary climate oscillations in the Late Pleistocene, and posterior expansion events following river connections in both North-and Southeastern European populations. This suggests an eastern refuge during glacial maxima (as already proposed for boreal and continental species). In contrast, Western Europe was colonised more recently following either natural expansions or putative human introductions. Low levels of genetic diversity observed within each studied population suggest recent bottleneck events and stress the urgent need for conservation measures to counteract the demographic decline experienced by the European mink.
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262 p.
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486 p.
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artículo científico (postprint)
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postprint
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Con el fin de analizar el efecto de los disruptores endocrinos en los peces, el siguiente proyecto plantea realizar un estudio histológico de una colección de muestras de gónadas y la medición del diámetro de los ovocitos vitelogenicos. El estudio se realizó en tres zonas diferentes con el propósito de comparar los resultados obtenidos.
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Los bioensayos con plantas son una herramienta indispensable para la evaluación de la toxicidad de los suelos. Gran parte de la variabilidad que dificulta su generalización y la interpretación de resultados radica en la falta de un protocolo estandarizado y común que elimine las variables asociadas a las condiciones experimentales, al germoplasma vegetal y a los bioindicadores relevantes de toxicidad que existen entre los bioensayos tradicionales con plantas. En nuestro estudio proponemos un bioensayo que permite de una forma sencilla, barata y efectiva cuantificar el efecto fitotóxico de los contaminantes en suelo y agua. La estandarización del material vegetal, las condiciones del ensayo y el análisis de imagen permiten mayor fiabilidad y una economía de tiempo y esfuerzo en estos bioensayos. En este estudio se presentan los resultados de toxicidad de Zn, Cd y Pb en disolución y suelos mineros mediante marcadores de biométricos, fisiológicos y génicos de Cucumis sativus.
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Síntesis y caracterización de nanopartículas de oro en medio orgánico y síntesis y caracterización de nanocilindros de oro en medio acuoso.
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Cadmium (Cd) is a toxic, biologically non-essential and highly mobile metal that has become an increasingly important environmental hazard to both wildlife and humans. In contrast to conventional remediation technologies, phytoremediation based on legume rhizobia symbiosis has emerged as an inexpensive decontamination alternative which also revitalize contaminated soils due to the role of legumes in nitrogen cycling. In recent years, there is a growing interest in understanding symbiotic legume rhizobia relationship and its interactions with Cd. The aim of the present review is to provide a comprehensive picture of the main effects of Cd in N-2-fixing leguminous plants and the benefits of exploiting this symbiosis together with plant growth promoting rhizobacteria to boost an efficient reclamation of Cd-contaminated soils.
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Context Pseudohypoparathyroidism type 1b (PHP-Ib) is characterized by renal resistance to PTH (and, sometimes, a mild resistance to TSH) and absence of any features of Albright's hereditary osteodystrophy. Patients with PHP-Ib suffer of defects in the methylation pattern of the complex GNAS locus. PHP-Ib can be either sporadic or inherited in an autosomal dominant pattern. Whereas familial PHP-Ib is well characterized at the molecular level, the genetic cause of sporadic PHP-Ib cases remains elusive, although some molecular mechanisms have been associated with this subtype. Objective The aim of the study was to investigate the molecular and imprinting defects in the GNAS locus in two unrelated patients with PHP-Ib. Design We have analyzed the GNAS locus by direct sequencing, Methylation-Specific Multiplex Ligation-dependent Probe Amplification, microsatellites, Quantitative Multiplex PCR of Short Fluorescent fragments and array-Comparative Genomic Hybridization studies in order to characterize two unrelated families with clinical features of PHP-Ib. Results We identified two duplications in the GNAS region in two patients with PHP-Ib: one of them, comprising similar to 320 kb, occurred 'de novo' in the patient, whereas the other one, of similar to 179 kb in length, was inherited from the maternal allele. In both cases, no other known genetic cause was observed. Conclusion In this article, we describe the to-our-knowledge biggest duplications reported so far in the GNAS region. Both are associated to PHP-Ib, one of them occurring 'de novo' and the other one being maternally inherited.
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52 p. : il., col
Gorputz adierazpena eta emozioak lantzen ikerkuntza-ekintzaren bidez: irakasle talde baten ibilbidea
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391 p.