198,586 research outputs found
Entrevista al Dr. Josep Maria Font i Rius
No full textEntrevista que recull alguns testimonis de la trajectòria acadèmica del Dr. Josep M. Font i Rius, jurista i historiador del dret català, en motiu del seu 95è aniversari1803.mp4
font-rius.mp
Tracking Invasion Histories in the Sea: Facing Complex Scenarios Using Multilocus Data
No full textIn recent years, new analytical tools have allowed researchers to extract historical information contained in molecular data, which has fundamentally transformed our understanding of processes ruling biological invasions. However, the use of these new analytical tools has been largely restricted to studies of terrestrial organisms despite the growing recognition that the sea contains ecosystems that are amongst the most heavily affected by biological invasions, and that marine invasion histories are often remarkably complex. Here, we studied the routes of invasion and colonisation histories of an invasive marine invertebrate Microcosmus squamiger (Ascidiacea) using microsatellite loci, mitochondrial DNA sequence data and 11 worldwide populations. Discriminant analysis of principal components, clustering methods and approximate Bayesian computation (ABC) methods showed that the most likely source of the introduced populations was a single admixture event that involved populations from two genetically differentiated ancestral regions - the western and eastern coasts of Australia. The ABC analyses revealed that colonisation of the introduced range of M. squamiger consisted of a series of non-independent introductions along the coastlines of Africa, North America and Europe. Furthermore, we inferred that the sequence of colonisation across continents was in line with historical taxonomic records - first the Mediterranean Sea and South Africa from an unsampled ancestral population, followed by sequential introductions in California and, more recently, the NE Atlantic Ocean. We revealed the most likely invasion history for world populations of M. squamiger, which is broadly characterized by the presence of multiple ancestral sources and non-independent introductions within the introduced range. The results presented here illustrate the complexity of marine invasion routes and identify a cause-effect relationship between human-mediated transport and the success of widespread marine non-indigenous species, which benefit from stepping-stone invasions and admixture processes involving different sources for the spread and expansion of their range
Nanographene patterns from focused ion beam-induced deposition structural characterization of graphene materials by XPS and raman scattering
No full textThe integration of carbon nanomaterials, having peculiar determined specifications and properties, presents fabrication and control challenges. The current attention on graphene research evidences the necessity to completely integrate gra phene in the standard semiconductor planar technologies as the route for future graphene-based nano-electronics. The chapter will introduce our work in Rius et al. (2012) as an approach inspired on the planar technology point of view and strategies. Merging the carbon nanomaterial preparation and lithography in a single processing step by means of focused ion beam induced deposition of carbon (FIBID-C), our route is a new concept of a robust and flex ible nanofabrication methodology for graphene. The strong points of this approach are (i) the uniqueness of the approach, toward transfer-free graphene-like patterns on insulators and (ii) a convenient platform for studying growth process of solid precursor-derived graphene-like materials. The nanographene products will be deeply investigated and characterized by means of two fundamental structural nondestructive techniques: X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy, using multi wavelength sources. The chapter will include a complete set of reference spectra of graphene, with their accurate discussion, high lighting the correlation of these two different, but comple mentary, analysis techniques (Yang et al. 2009)
Cap de Port, la Restanca i Rius, des del cim del Montardo d'Aran (2.830 m.)
No full textBoExcursió del 24 al 26 de setembre de 1976. Itinerari: Pont de Rius (1700 m.) - Refugi de 'La Restanca' (2010 m.) - Estany de Mar (2285 m.) - Refugi bivac 'Besiberri a la Bretxa Peyta (2805 m.) - Refugi de 'La Restanca' - Port de Güellacrestada (2425 m.) - Montardo d'Aran (2830 m.) - Barracó de les obres junt al xalet de la companyia (1996 m.
Tough adults, frail babies: an analysis of stress sensitivity across early life-history stages of widely introduced marine invertebrates
No full textAll ontogenetic stages of a life cycle are exposed to environmental conditions so that population persistence depends on the performance of both adults and offspring. Most studies analysing the influence of abiotic conditions on species performance have focussed on adults, while studies covering early life-history stages remain rare. We investigated the responses of early stages of two widely introduced ascidians, Styela plicata and Microcosmus squamiger, to different abiotic conditions. Stressors mimicked conditions in the habitats where both species can be found in their distributional ranges and responses were related to the selection potential of their populations by analysing their genetic diversity. Four developmental stages (egg fertilisation, larval development, settlement, metamorphosis) were studied after exposure to high temperature (30°C), low salinities (26 and 22 ) and high copper concentrations (25, 50 and 100 µg/L). Although most stressors effectively led to failure of complete development (fertilisation through metamorphosis), fertilisation and larval development were the most sensitive stages. All the studied stressors affected the development of both species, though responses differed with stage and stressor. S. plicata was overall more resistant to copper, and some stages of M. squamiger to low salinities. No relationship was found between parental genetic composition and responses to stressors. We conclude that successful development can be prevented at several life-history stages, and therefore, it is essential to consider multiple stages when assessing species' abilities to tolerate stress. Moreover, we found that early development of these species cannot be completed under conditions prevailing where adults live. These populations must therefore recruit from elsewhere or reproduce during temporal windows of more benign conditions. Alternatively, novel strategies or behaviours that increase overall reproductive success might be responsible for ensuring population survival
La Restanca i barranc de Rius
No full textBoExcursió del 6 al 7 de setembre de 1975. Itinerari: Pont de Rius (1.700 m.) – Refugi de ‘La Restanca’ (2.010 m.) – Estany de Cap de Port (2.240 m.) – Estany de Mar (2.285 m.) – Cota 2.630 a la Bretxa Peyta (Refugi ‘Besiberri’), sota el Besiberri Nord – Refugi de ‘La Restanca’ – Arties (1.144 m.
Besiberri Nord i Pic de la Canal de Rius (2813 m.)
No full textBoExcursió del 12 al 14 d'octubre de 1973. Itinerari: Hospital de Viella - Canal de Molières - Cabana de la Pleta Nova de Molières (1980 m.) - Pleta de Molières - Hospital de Viella - Pont de Rius - Refugi de 'La Restanca' - Estany de Mar (2285 m.) - Refugi de 'La Restanca' - Pont de Riu
Precision nanomedicines for prostate cancer
No full textEditorial. Published online: 27 February 2018Anna Cifuentes-Rius, Lisa M Butler and Nicolas H Voelcke
L'Estany Tort de Rius des del Refugi 'Besiberri'
No full textBoExcursió del 24 al 26 de setembre de 1976. Itinerari: Pont de Rius (1700 m.) - Refugi de 'La Restanca' (2010 m.) - Estany de Mar (2285 m.) - Refugi bivac 'Besiberri a la Bretxa Peyta (2805 m.) - Refugi de 'La Restanca' - Port de Güellacrestada (2425 m.) - Montardo d'Aran (2830 m.) - Barracó de les obres junt al xalet de la companyia (1996 m.
A Pont de Rius, sota la Restanca
No full textBoExcursió del 12 al 14 d'octubre de 1973. Itinerari: Hospital de Viella - Canal de Molières - Cabana de la Pleta Nova de Molières (1980 m.) - Pleta de Molières - Hospital de Viella - Pont de Rius - Refugi de 'La Restanca' - Estany de Mar (2285 m.) - Refugi de 'La Restanca' - Pont de Riu
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