1000 resultados para 640399 Other


Relevância:

20.00% 20.00%

Publicador:

Resumo:

Nematodes are the most abundant metazoans, comprising more than 80% of all animals alive today. Since 1743, when Needham (Needham, 1743) described the first nematode, approximately 20,000 - 30,000 species have been named, with estimates of species remaining to be described ranging from 100,000 to 1 million (Blaxter, 2004; De Ley, 2000). Unfortunately, the taxonomic community is woefully inadequate for this task. The number of taxonomists currently describing new species of nematodes around the world is less than 100, and significant increases are not expected. If each of these taxonomists were able to describe 10 new species every year, it would take between 100 to 1,000 years to name these yet to be described species.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Understanding the spatial distribution of organisms is a central topic in ecology. The European roe deer (Capreolus capreolus) population is in Portugal and Norway at the southwestern and northern edge of its distribution, respectively. Understanding the factors that act on these populations enlightens both local aspects concerning their conservation and wider scale aspects of the species bioclimatic envelope, which is crucial for being better able to predict the impacts of environmental change. The main aim of this thesis was to evaluate roe deer distribution in Portugal and Norway, two countries with contrasting landscapes, seasonality and with different anthropogenic pressure. The interspecific relationship with sympatric ungulates was also analysed. By using pellet group counts, we investigated habitat use of roe deer, identifying the major environmental descriptors, to understand the importance of forest structure, vegetation characteristics, landscape structure and human disturbance on their distribution. The analyses were based on presence – absence data and were carried out at two spatial scales. The results showed that habitat use of roe deer was different across countries. In Portugal, at the local scale, roe deer distribution was positively associated with high density of shrubs, especially heather and brambles, while the presence of red deer had a negative effect on their distribution. At a broad scale, roe deer was negatively associated with spatial heterogeneity, namely mean shape index and made less use of areas close to agricultural fields. In Norway, at the local scale, roe deer made more use of areas with high cover of deciduous trees and patches containing juniper and Vaccinium sp.. At a broad scale, roe deer use patches near edges between fields and forest. In both countries, roe deer make use of areas further away from roads. While in Norway roe deer in both summer and winter are always close to houses, in Portugal they are either far (summer) or indifferent (winter). Anthropogenic disturbance is better tolerated in Norway, where the importance of the critical season seems to be higher. Human disturbance may contribute to roe deer habitat loss in Portugal, while roe deer are able to persist close to humans in managed landscapes in Norway. In fact, some of the differences observed could be more due to the indirect impacts of human exploitation (e.g. presence of free-ranging dogs and hunting regulation) rather than the actual human presence or land-use per se. I conclude that the methodology and tools developed here are readily expandable to address similar questions in different contexts. Wildlife management would benefit greatly from a more holistic/integrative approach and that should include human aspects, as human disturbance is expected to continue increasing.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Sociology has come late to the field of Human Animal Studies (HAS), and such scholarship remains peripheral to the discipline. Early sociological interventions in the field were often informed by a critical perspective, in particular feminism but also Marxism and critical race studies. There have also been less critical routes taken, often using approaches such as actor-network theory and symbolic interactionism. These varied initiatives have made important contributions to the project of animalizing sociology and problematizing its legacies of human-exclusivity. As HAS expands and matures however, different kinds of study and different normative orientations have come increasingly into relations of tension in this eclectic field. This is particularly so when it comes to the ideological and ethical debates on appropriate human relations with other species, and on questions of whether and how scholarship might intervene to alter such relations. However, despite questioning contemporary social forms of human-animal relations and suggesting a need for change, the link between analysis and political strategy is uncertain. This paper maps the field of sociological animal studies through some examples of critical and mainstream approaches and considers their relation to advocacy. While those working in critical sociological traditions may appear to have a more certain political agenda, this article suggests that an analysis of 'how things are' does not always lead to a coherent position on 'what is to be done' in terms of social movement agendas or policy intervention. In addition, concepts deployed in advocacy such as rights, liberation and welfare are problematic when applied beyond the human. Even conceptions less entrenched in the liberal humanist tradition such as embodiment, care and vulnerability are difficult to operationalize. Despite complex and contested claims however, this paper suggests that there might also be possibilities for solidarity.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

The Editorial on the Research Topic: Facing the Other: Novel Theories and Methods in Face Perception Research

Relevância:

20.00% 20.00%

Publicador:

Resumo:

This document contains notes on several species of birds observed by Arthur T. Wayne in South Carolina including the Sooty Shearwater, the Harlequin Duck, the Snow Goose, the Blue Goose, the Egret, the Yellow-crowned Night Heron, the Hudsonian Curlew, the Turnstone, the Pigeon Hawk, the Crested Flycatcher, the Bronzed Grackle, the Carolina Grackle, the Ipswich Sparrow, Leconte’s Sparrow, the Mountain Solitary Vireo, Bachman’s Warbler, the Magnolia Warbler, the Black-throated Green Warbler, and the Connecticut Warbler.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Les personnes atteintes de démence sévère, résidant dans un centre d’hébergement et de soins de longue durée (CHSLD) et approchant la fin de leur vie, ne reçoivent pas systématiquement des soins palliatifs, malgré que ce niveau de soins soit le plus approprié. La plupart de ces personnes reçoivent également un grand nombre de médicaments dont les effets indésirables peuvent contribuer à des souffrances évitables. Une approche axée sur les soins palliatifs serait possiblement associée à une réduction de la charge médicamenteuse et, du même coup, à une prescription plus appropriée. Les objectifs de ce projet de recherche étaient de décrire l’usage des médicaments chez les résidents atteints de démence sévère en CHSLD, de comparer leur usage de médicaments à des critères de pertinence et d’évaluer si la mise en œuvre d’une approche axée sur les soins palliatifs était associée aux médicaments prescrits. Cette étude décrit l’usage des médicaments chez 215 sujets atteints de démence sévère et en fin de vie qui ont participé à une étude d’intervention quasi expérimentale menée dans quatre CHSLD du Québec sur la mise en œuvre d’une approche axée sur les soins palliatifs. L’utilisation des médicaments a été comparée à trois listes de critères pertinents publiés, soit ceux de Holmes, Rancourt et Kröger, en utilisant des statistiques descriptives. Les analyses sur l’usage de 412 médicaments différents chez 120 sujets du groupe expérimental et 95 sujets du groupe témoin ont montré que cette approche axée sur les soins palliatifs n’est pas associée à une prescription plus appropriée des médicaments chez ces personnes particulièrement vulnérables.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Tese de doutoramento, Biologia (Biologia Marinha e Aquacultura), Universidade de Lisboa, Faculdade de Ciências, 2014

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Pressure on the environment has increased in step with economic growth and the mass consumption that fueled rising gross domestic product throughout the twentieth century. Both growth and ecological crises have attained a global reach, challenging our established notions of cause and effect, and our framing of problems and solutions. Accordingly, global environmental politics has witnessed major changes and significant "rescaling" in its "locus, agency and scope" (Andonova and Mitchell2010: 257). Both dimensions of global environmental politics - politics and governance, and the ecological problems that are the subject matter of global environmental politics - are being reinterpreted due to increasing complexity, interconnectedness and interdependence. Accordingly, the range of actors and disciplines that infom1 global environmental politics and contribute to framing global environmental problems is widening, in an acknowledgment of inescapable pluralism.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Hospitals are considered as a special and important type of indoor public place where air quality has significant impacts on potential health outcomes. Information on indoor air quality of these environments, concerning exposures to particulate matter (PM) and related toxicity, is limited though. This work aims to evaluate risks associated with inhalation exposure to ten toxic metals and chlorine (As, Ni, Cr, Cd, Pb, Mn, Se, Ba, Al, Si, and Cl) in coarse (PM2.5–10) and fine (PM2.5) particles in a Portuguese hospital in comparison with studies representative of other countries. Samples were collected during 1 month in one urban hospital; elemental PM characterization was determined by proton-induced X-ray emission. Noncarcinogenic and carcinogenic risks were assessed according to the methodology provided by the United States Environmental Protection Agency (USEPA; Region III Risk-Based Concentration Table) for three different age categories of hospital personnel (adults, >20, and <65 years) and patients (considering nine different age groups, i.e., children of 1–3 years to seniors of >65 years). The estimated noncarcinogenic risks due to occupational inhalation exposure to PM2.5-bound metals ranged from 5.88×10−6 for Se (adults, 55–64 years) to 9.35×10−1 for As (adults, 20–24 years) with total noncarcinogenic risks (sum of all metals) above the safe level for all three age categories. As and Cl (the latter due to its high abundances) were the most important contributors (approximately 90 %) to noncarcinogenic risks. For PM2.5–10, noncarcinogenic risks of all metals were acceptable to all age groups. Concerning carcinogenic risks, for Ni and Pb, they were negligible (<1×10−6) in both PM fractions for all age groups of hospital personnel; potential risks were observed for As and Cr with values in PM2.5 exceeding (up to 62 and 5 times, respectively) USEPA guideline across all age groups; for PM2.5–10, increased excess risks of As and Cr were observed particularly for long-term exposures (adults, 55–64 years). Total carcinogenic risks highly (up to 67 times) exceeded the recommended level for all age groups, thus clearly showing that occupational exposure to metals in fine particles pose significant risks. If the extensive working hours of hospital medical staff were considered, the respective noncarcinogenic and carcinogenic risks were increased, the latter for PM2.5 exceeding the USEPA cumulative guideline of 10−4. For adult patients, the estimated noncarcinogenic and carcinogenic risks were approximately three times higher than for personnel, with particular concerns observed for children and adolescents.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

This work evaluates the possibility of using spent coffee grounds (SCG) for biodiesel production and other applications. An experimental study was conducted with different solvents showing that lipid content up to 6 wt% can be obtained from SCG. Results also show that besides biodiesel production, SCG can be used as fertilizer as it is rich in nitrogen, and as solid fuel with higher heating value (HHV) equivalent to some agriculture and wood residues. The extracted lipids were characterized for their properties of acid value, density at 15 °C, viscosity at 40 °C, iodine number, and HHV, which are negatively influenced by water content and solvents used in lipid extraction. Results suggest that for lipids with high free fatty acids (FFA), the best procedure for conversion to biodiesel would be a two-step process of acid esterification followed by alkaline transesterification, instead of a sole step of direct transesterification with acid catalyst. Biodiesel was characterized for its properties of iodine number, acid value, and ester content. Although these quality parameters were not within the limits of NP EN 14214:2009 standard, SCG lipids can be used for biodiesel, blended with higher-quality vegetable oils before transesterification, or the biodiesel produced from SCG can be blended with higher-quality biodiesel or even with fossil diesel, in order to meet the standard requirements.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

This thesis studies the prevalence and survival of spinoff entrants in Portugal from 1987 to 2008. Information on worker flows is used to identify them at a population level, providing evidence on other operations such as mergers and acquisitions. We show that the number of spinoffs has been increasing at a higher rate than other entrants of comparable size. Studying the determinants of their exit suggests that the most important predictor is whether the spinoff was motivated by the failure of the parent firm. The effect of industry specific knowledge and previous experience of the founders from working together in the parent firm is seemingly negligible, with only weak evidence supporting the latter.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

The purpose of this paper is to review the scientific literature from August 2007 to July 2010. The review is focused on more than 420 published papers. The review will not cover information coming from international meetings available only in abstract form. Fingermarks constitute an important chapter with coverage of the identification process as well as detection techniques on various surfaces. We note that the research has been very dense both at exploring and understanding current detection methods as well as bringing groundbreaking techniques to increase the number of marks detected from various objects. The recent report from the US National Research Council (NRC) is a milestone that has promoted a critical discussion on the state of forensic science and its associated research. We can expect a surge of interest in research in relation to cognitive aspect of mark and print comparison, establishment of relevant forensic error rates and statistical modelling of the selectivity of marks' attributes. Other biometric means of forensic identification such as footmarks or earmarks are also covered in the report. Compared to previous years, we noted a decrease in the number of submission in these areas. No doubt that the NRC report has set the seed for further investigation of these fields as well.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

BACKGROUND: Screening of peripheral atherosclerosis is increasingly used, but few trials have examined its clinical impact. We aimed to assess whether carotid plaque screening helps smokers to improve their health behaviors and cardiovascular risk factors. METHODS: We randomly assigned 536 smokers aged 40 to 70 years to carotid plaque ultrasonographic screening (US group) vs no screening (control group) in addition to individual counseling and nicotine replacement therapy for all participants. Smokers with at least 1 plaque received pictures of their plaques with a 7-minute structured explanation. The outcomes included biochemically validated smoking cessation at 12 months (primary outcome) and changes in cardiovascular risk factor levels and Framingham risk score. RESULTS: At baseline, participants (mean age, 51.1 years; 45.0% women) smoked an average of 20 cigarettes per day with a median duration of 32 years. The US group had a high prevalence of carotid plaques (57.9%). At 12 months, smoking cessation rates were high, but did not differ between the US and control groups (24.9% vs 22.1%; P = .45). In the US group, cessation rates did not differ according to the presence or absence of plaques. Control of cardiovascular risk factors (ie, blood pressure and low-density lipoprotein cholesterol and hemoglobin A(1c) levels in diabetic patients) and mean absolute risk change in Framingham risk score did not differ between the groups. The mean absolute risk change in Framingham risk score was +0.6 in the US group vs +0.3 in the control group (P = .56). CONCLUSION: In smokers, carotid plaque screening performed in addition to thorough smoking cessation counseling is not associated with increased rates of smoking cessation or control of cardiovascular risk factors. Trial Registration  clinicaltrials.gov Identifier: NCT00548665.