Visualização de dados arqueológicos: Um exemplo de utilização do visualization toolkit

A Arqueologia tem como principal objectivo reconstruir todo o processo que conduziu à formação do registo arqueológico. Ou seja, pretende-se compreender como foram erguidos edifícios e estruturas, e como foram destruídos e cobertos por sucessivas camadas de terra. Entender os mecanismos de formação de um arqueosítio é fundamental para a sua interpretação. Modelos 3D de reconstituição de edifícios são uma importante ferramenta para assistir o arqueólogo nesta tarefa. Com este trabalho pretende-se mostrar que a aplicação de técnicas actuais de Visualização a dados arqueológicos é uma mais-valia importante na prossecução desses objectivos. Para isso desenvolveu-se um primeiro protótipo de aplicação, com base no VTK, que importa dados arqueológicos e modelos reconstruídos, e permite a sua visualização interactiva. É possível realizar um conjunto de operações sobre os modelos visualizados, com o objectivo de proporcionar aos arqueólogos diferentes tipos de leitura de um arqueosítio

A mass spectrometry study of compounds with environmental and biological interest

Tese de doutoramento, Química (Química Analítica), Universidade de Lisboa, Faculdade de Ciências, 2010The leading thread of this work is the application of Mass Spectrometry to the study of environmental and biological relevant compounds. Several studies were performed involving the development and optimization of efficient analysis methodologies, the behaviour of the compounds under study was investigated using various mass spectrometry techniques and fundamental studies were carried out, most of them complemented with semi-empirical calculations. Matrix-Assisted Laser Desorption/Ionization (MALDI) has been extensively used for the analysis of large molecules. Nevertheless, since the technique provides soft and efficient ionization of thermolabile and non-volatile organic compounds, we decided to investigate its application to small molecules as an alternative ionization method. For that we compared the performance of nanosized TiO2 anatase as matrix with that of common organic matrices. The formation of organic matrix-flavonoid cluster ions was also investigated and it was found to be dependent of the structure of the flavonoid. Aniline derivatives are of great industrial importance and several constitute a significant group of pollutants. The gas-phase behaviour of halo- and nitroanilines under electrospray ionization mass spectrometry conditions was studied. Isomer identification methodologies are proposed using for that purpose competitive fragmentations of protonbound heterodimers. Preliminary results on the behaviour of the aniline derivatives when subjected to electron capture dissociation conditions are presented and discussed. The behaviour of five isoflavones was studied under electrospray ionization mass spectrometry in the positive ion mode. The fragmentation mechanisms were proposed taking into account MSn experiments, accurate mass measurements and semi-empirical calculations. Some of the fragmentations were found to be dependent on the substitution pattern of the B-ring and the ions afforded by these fragmentations can be considered as diagnostic ions. Several newly synthesized -lactones, fused or C-C linked to sugar rings, were studied. Their fragmentation mechanisms were proposed taking into account MSn experiments and semi-empirical calculations. FTICR-MS; ESI; MALDI; Fragmentation Mechanisms; Collision Induced DissociationEste trabalho tem como domínio comum a aplicação da Espectrometria de Massa ao estudo de vários compostos com interesse ambiental e biológico. Foram realizados estudos que envolvem o desenvolvimento e optimização de metodologias eficientes de análise; foi investigado o comportamento dos compostos em estudo usando várias técnicas de espectrometria de massa e foram realizados estudos de natureza fundamental, a maioria dos quais complementados por cálculos semi-empíricos. Concretamente: Ionização/desorção laser assistida por matriz (MALDI) é uma técnica de ionização muito usada na análise de moléculas com massas moleculares elevadas. No entanto, a sua capacidade de ionizar de um modo suave e eficiente compostos não voláteis e termicamente instáveis levou-nos a investigar a sua aplicabilidade à análise de moléculas pequenas. Para tal, comparou-se a performance da fase anatase do TiO2 com a de matrizes orgânicas convencionais na ionização de vários compostos cobrindo várias classes. Um dos compostos em particular, um flavonóide, formou iões agregados com a matriz orgânica, o que nos levou a aprofundar o estudo deste comportamento. Conclui-se que a estrutura do flavonóide influencia a formação dos iões agregados. Derivados de anilina têm uma grande importância a nível industrial e os derivados halogenados, em particular, constituem um grupo de poluentes bastante significativo. Assim, estudou-se o comportamento em fase gasosa de halo- e nitroanilinas com o intuito de estabelecer mecanismos de fragmentação e metodologias que permitam a identificação de isómeros. Para a identificação de isómeros recorreu-se a fragmentações competitivas de heterodímeros ligados por protão. Também são apresentados e discutidos resultados preliminares sobre o comportamento de derivados de anilina quando expostos a condições de dissociação por captura de electrões. O comportamento de cinco isoflavonas foi estudado no modo positivo e recorrendo à espectrometria de massa com ionização por electrospray. Foram propostos mecanismos de fragmentação tendo em conta experiências de espectrometria de massa tandem, medições de massa exacta e cálculos semi-empíricos. Algumas das fragmentações observadas são dependentes do anel B e dos seus substituintes e, como tal, os iões originados por estas fragmentações podem ser considerados como iões diagnóstico. Várias -lactonas fundidas ou ligadas a açúcares, compostos recentemente sintetizados, foram estudadas com o intuito de estabelecer mecanismos de fragmentação. Tal foi feito tendo em conta dados de espectrometria de massa tandem e cálculos semi-empíricos. FTICR-MS; ESI; MALDI; Mecanismos de Fragmentação; Dissociação Induzida por ColisãoThe work presented in this thesis was performed in the Environmental and Biological Mass Spectrometry Group, Departamento de Química e Bioquímica da Faculdade de Ciências da Universidade de Lisboa, with the financial support of Fundação para a Ciência e a Tecnologia (SFRH/BD/27614/2006

Public policies for the promotion of horticulture: the case of Algarve´s citrus.

Special session 27: "Territorial Governance, Rural Areas and Local Agro Food Systems"(964)This research approaches some factors that have been affecting the competitiveness faced by the Algarve’s citrus culture since the European Single Market came into force and before a more and more global economy. As it is already known, in a global economy any competitive strategy must have underlying quality(ies). These are understood as the capacity to satisfy the market considered as a whole of the main types of agents at the different levels of Algarve’s citrus system. So, the main object of this work is to identify eventual (technical and institutional) mal-functions concerning the Algarve citrus system, that can fail either directly or indirectly to meet the principal clients/consumers’ expectations. The study took into account the general context where the Algarve’s citrus culture is inserted. The aim is to identify the constraints faced by the sector in order to understand the main clients, suppliers and competitors’ behaviours. The results have allowed us to characterize the quality attributes considered as determinants when the citrus fruits are acquired, namely the Algarve’s citrus, by the national consumers as well as by the main distribution channels, in case they are presented in the market as differentiated or undifferentiated. The facts identified in the empirical research indicate that limitations of technical and institutional order can make unfeasible or strongly condition the capacity of the Algarve citrus culture (production subsystem) to meet the market requirements. The conclusions reached for the development of the Algarve citrus culture, were based on Hayami and Ruttan´s “induced technical and institutional innovation” theory (1998). We think we have given a contribution towards the definition of strategies for the Algarve’s citrus culture development, bearing in mind both the market and the available resources.This paper has been partially supported by the Portuguese Foundation for Science and Technology (FCT

Visualização e análise de dados arqueológicos usando o visualization toolkit

Os modelos virtuais são cada vez mais utilizados quer na divulgação de sítios arqueológicos, quer como ferramentas auxiliares do trabalho de investigação dos arqueólogos. Para tal, modelos 3D construídos com base numa interpretação dos dados arqueológicos, ou numa leitura de planos de escavação, podem ser entendidos como maquetas digitais virtuais, que podem ser “desmontadas” para melhor analisar e compreender uma reconstrução de estruturas arquitectónicas encontradas numa escavação, ou a visualização da distribuição espacial dos achados. Este artigo apresenta um segundo protótipo de uma aplicação que disponibiliza um conjunto de funcionalidades adequadas à análise arqueológica e que actuam sobre modelos virtuais 3D. À semelhança do anterior, este protótipo foi desenvolvido com base no VTK e permite atingir os objectivos definidos: (1) utilização de modelos 3D como ferramentas auxiliares do trabalho de investigação arqueológica e (2) reconstrução de sequências de planos de escavação. As novas leituras, decorrentes da combinação arbitrária de operações de rotação, translação, ampliação/redução, “desmontagem” e seccionamento de modelos 3D, permitem aos utilizadores do sistema compreender melhor os sítios arqueológicos em estudo.Zacon Grou

Understanding memorable enogastronomic experiences: A qualitative approach

The objectives of this chapter are to: - Introduce those factors that make a memorable enogastronomic experience for tourists visiting a destination; - Present qualitative findings that reveal that gastronomy and wines play a major role in the way that visitors experience a destination and indicate that some travellers would return to the same destination to savour its unique gastronomy.info:eu-repo/semantics/acceptedVersio

Horticulture in Algarve: a case study for sustainable development

This study takes into account the general context where the Algarve’s citrus culture is inserted. The aim is to identify the constraints faced by the sector in order to understand the main clients, suppliers and competitors’ behaviours. The results have allowed us to characterize the quality attributes considered as determinants when the citrus fruits are acquired, namely the Algarve’s citrus, by the national consumers as well as by the main distribution channels, in case they are presented in the market as differentiated or undifferentiated. The facts identified in the empirical research indicate that limitations of technical and institutional order can make unfeasible or strongly condition the capacity of the Algarve citrus culture (production subsystem) to meet the market requirements. The conclusions reached for the development of the Algarve citrus culture, were based on Hayami and Ruttan´s “induced technical and institutional innovation” theory (1998). We think we have given a contribution towards the definition of strategies for the Algarve’s citrus culture development, bearing in mind both the market and the available resources

Lipid composition and dynamics of cell membranes of Bacillus stearothermophilus adapted to amiodarone

Bacillus stearothermophilus, a useful model to evaluate membrane interactions of lipophilic drugs, adapts to the presence of amiodarone in the growth medium. Drug concentrations in the range of 1-2 [mu]M depress growth and 3 [mu]M completely suppresses growth. Adaptation to the presence of amiodarone is reflected in lipid composition changes either in the phospholipid classes or in the acyl chain moieties. Significant changes are observed at 2 [mu]M and expressed by a decrease of phosphatidylethanolamine (relative decrease of 23.3%) and phosphatidylglycerol (17.9%) and by the increase of phosphoglycolipid (162%). The changes in phospholipid acyl chains are expressed by a decrease of straight-chain saturated fatty acids (relative decrease of 12.2%) and anteiso-acids (22%) with a parallel increase of the iso-acids (9.8%). Consequently, the ratio straight-chain/branched iso-chain fatty acids decreases from 0.38 (control cultures) to 0.30 (cultures adapted to 2 [mu]M amiodarone). The physical consequences of the lipid composition changes induced by the drug were studied by fluorescence polarization of diphenylhexatriene and diphenylhexatriene-propionic acid, and by differential scanning calorimetry. The thermotropic profiles of polar lipid dispersions of amiodarone-adapted cells are more similar to control cultures (without amiodarone) than those resulting from a direct interaction of the drug with lipids, i.e., when amiodarone was added directly to liposome suspensions. It is suggested that lipid composition changes promoted by amiodarone occur as adaptations to drug tolerance, providing the membrane with physico-chemical properties compatible with membrane function, counteracting the effects of the drug.http://www.sciencedirect.com/science/article/B6VNN-419BF60-K/1/8f2d4fae7f9c131d26230cf4123da94

Smoking and antidepressants pharmacokinetics: a systematic review

Despite an increasingly recognized relationship between depression and smoking, little is known about how smoking influences antidepressant response and treatment outcomes. The aim of this study was to systematically review the evidence of the impact of smoking on new-generation antidepressants with an emphasis on the pharmacokinetic perspective. METHODS: We present a systematic review of clinical trials comparing the serum levels of new-generation antidepressants in smokers and nonsmokers. Data were obtained from MEDLINE/PubMed, Embase, and other sources. Risk of bias was assessed for selection, performance, detection, attrition, and reporting of individual studies. RESULTS: Twenty-one studies met inclusion criteria; seven involved fluvoxamine, two evaluated fluoxetine, sertraline, venlafaxine, duloxetine or mirtazapine, and escitalopram, citalopram, trazodone and bupropion were the subject of a single study. No trials were found involving other common antidepressants such as paroxetine or agomelatine. Serum levels of fluvoxamine, duloxetine, mirtazapine and trazodone were significantly higher in nonsmokers compared with smokers. CONCLUSIONS: There is evidence showing a reduction in the concentration of serum levels of fluvoxamine, duloxetine, mirtazapine and trazodone in smoking patients as compared to nonsmokers. The evidence regarding other commonly used antidepressants is scarce. Nonetheless, smoking status should be considered when choosing an antidepressant treatment, given the risk of pharmacokinetic interactions.info:eu-repo/semantics/publishedVersio