55 research outputs found

    Species ecological envelopes under climate change scenarios: a case study for the main two wood-production forest species in Portugal

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    Species ecological envelope maps were obtained for the two main Portuguese wood-production species (Eucalyptus globulus Labill. and Pinus pinaster Aiton) and projected future climate change scenarios. A machine learning approach was used to understand the most influential environmental variables that may explain current species distribution and productivity. Background and Objectives: The aims of the study were: (1) to map species potential suitability areas using ecological envelopes in the present and to project them in the future under climate change scenarios; (2) to map species current distributions; (3) to map species current productivity; and (4) to explore the most influential environmental variables on species current distribution and productivity. Materials and Methods: Climate, elevation data, and soil data sets were used to obtain present and future species ecological envelopes under two climate change scenarios. The o cial land cover maps were used to map species distributions. Forest inventory data were used to map the species productivity by geostatistical techniques. A Bayesian machine learning approach, supported by species distributions and productivity data, was used to explore the most influential environmental variables on species distribution and productivity and to validate species ecological envelopes. Results: The species ecological envelope methodology was found to be robust. Species’ ecological envelopes showed a high potential for both species’ a orestation. In the future, a decrease in the country’s area potentiality was forecasted for both species. The distribution of maritime pine was found to be mainly determined by precipitation-related variables, but the elevation and temperature-related variables were very important to di erentiate species productivity. For eucalypts, species distribution was mainly explained by temperature-related variables, as well as the species productivity. Conclusions: These findings are key to support recommendations for future a orestation and will bring value to policy-makers and environmental authorities in policy formulation under climate change scenariosinfo:eu-repo/semantics/publishedVersio

    Pós-Graduações online IPCB/UAb

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    eLIES2018. VIIº Encontro de Instituições e Unidades de eLearning do Ensino Superior- Sessão Posters/Networking, Castelo Branco: Instituto Politécnico de Castelo Branco, co-organização do LE@D, Universidade Aberta (UID 4372/FCT), Instituto Politécnico de Castelo Branco, Universidade do Algarve.Esta comunicação apresenta os cursos de pós-graduação em parceria entre o Instituto Politécnico de Castelo Branco e a Universidade Aberta: a pós-graduação sobre proteção civil e a pós-graduação sobre sistemas de informação geográfica aplicada aos recursos agroflorestais e ambientais.info:eu-repo/semantics/publishedVersio

    O grau de divulgação de informação nos websites das IPSS

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    Trabalho apresentado em VII Congresso Internacional de Contabilidade e Auditoria (XVII CICA), 7-8 de novembro 2019, Porto, PortugalO terceiro setor, onde se enquadram as IPSS, tem vindo nas últimas décadas a crescer em dimensão e peso na economia portuguesa. A accountability destas entidades, tem estado sob forte escrutínio da sociedade onde se inserem e vão para além das obrigações legais. Esta investigação, ainda que exploratória e de âmbito limitado - apenas as IPSS do concelho de Setúbal - tem como objetivo analisar como as IPSS utilizam a internet para se darem a conhecer e divulgar informação. Deste modo, propomos um índice para avaliar o nível da informação prestada através dos websites dessas Instituições, o que nos permitiu constatar que existem um grande espaço de progressão na divulgação de informação financeira e não financeira (em cinco perspetivas: institucional, atividades ou projetos, prestação de contas, navegabilidade e acessibilidade), de modo a alcançarem no global, uma posição razoável de transparência na difusão da informação perante todos os stakeholders.N/

    O desempenho empresarial numa ótica de caixa: estudo comparativo entre as PME’s excelência e as médias empresas portuguesas

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    Trabalho apresentado em XVIII Encuentro AECA, 20-21 de setembro 2018, Lisboa, PortugalO tecido empresarial português é constituído, essencialmente, por pequenas e médias empresas e no atual contexto de incerteza em que estas desenvolvem a sua atividade, o fator liquidez, é uma das principais preocupações dos gestores. Neste contexto destacam-se as PME Excelência, que constituem a “nata” das PME’s em Portugal. Este estudo tem por objetivo comparar o desempenho entre as PME Excelência’16 e o universo das empresas portuguesas de média dimensão, numa perspetiva de caixa pelo que se recorreu a um conjunto dos indicadores suportado na Demonstração de Fluxos de Caixa, ao invés de uma abordagem mais tradicional. Constatamos que, por um lado, as PME Excelência apresentam uma maior capacidade de gerar caixa por unidade vendida, um maior esforço de investimento e financiamento com maior recurso aos fluxos gerados pelo seu negócio em detrimento de financiamento por parte de sócios/acionistas ou empréstimos bancários e, por outro lado, apresentam um rácio inferior na qualidade dos resultados (transformação de volume de negócios e EBITDA em fluxos monetários recebidos).N/

    A divulgação de informação nos websites: estudo comparativo das IPSS dos concelhos de Beja e de Setúbal

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    Trabalho apresentado em XIX Encuentro Internacional AECA, 17-18 de setembro 2020, onlineA economia do terceiro setor apresenta hoje um peso significativo no PIB nacional, o que por si só justifica um olhar atento sobre a divulgação da sua informação. Acontecimentos recentes e a crescente exigência da sociedade no que respeita à accountability tem feito com que este setor esteja sob forte escrutínio (Pardal et al, 2019). O caso de estudo que aqui apresentamos constitui a aplicação de índice construído às Instituições Particulares de Solidariedade Social do Concelho de Beja. Este mesmo índice foi desenvolvido por Pedro et al (2019), mas aplicado às IPSS do concelho de Setúbal, pelo que iremos em capítulo próprio comparar os resultados obtidos para cada um dos concelhos e analisar as respetivas diferenças. No que se refere ao concelho de Setúbal foram avaliadas 47 IPSS, das quais 35 divulgam informação financeira. Comparativamente no concelho de Beja temos um conjunto de 22 IPSS avaliadas, das quais 19 divulgam informação financeira. A dimensão dos números em análise está intimamente ligada à densidade populacional (503,8 em Setúbal e 29,4 em Beja no ano de 2018)1 , ao PIB per capita (25821,7 Setúbal e 18446,6 para Beja)2 e claro ao envelhecimento da população em cada um dos cada um dos concelhos.N/

    Prognostic value of MGMT promoter methylation in glioblastoma patients treated with temozolomide-based chemoradiation : a Portuguese multicentre study

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    Glioblastoma (GBM) is the most common and aggressive primary brain tumor. The identification of novel molecular prognostic markers of GBM has recently been an area of great interest in neuro-oncology. The methylation status of the MGMT gene promoter is currently a promising molecular prognostic marker, but some controversial data have precluded its clinical use. We analyzed MGMT methylation by methylation-specific PCR in 90 GBM patients from four Portuguese hospitals, uniformly treated with radiotherapy combined with concomitant and adjuvant temozolomide (Stupp protocol). The Kaplan-Meier method was used to construct survival curves, and the log-rank test and a Cox-regression model were used to analyze patient survival. The methylation status of MGMT was successfully determined in 89% (80/90) of the tumors. The frequency of tumoral MGMT promoter methylation was 47.5%. The median overall survivals (OSs) were 16 months (95% CI 12.2-19.8) and 13 months (95% CI 13.3-18.7) for patients whose tumors had a methylated or unmethylated MGMT, respectively. Univariate and multivariate analyses did not show any statistically significant association between MGMT methylation status and patient OS (P=0.583 by the log-rank test; P=0.617 by the Cox-regression test) or progression-free survival (P=0.775 by the log-rank test; P=0.691 by the Cox-regression test). None of the patient clinical features were significantly correlated with survival. This is the first study to report the frequency of MGMT methylation among Portuguese GBM patients. Our data did not show statistically significant associations between MGMT promoter methylation and the outcome of GBM patients treated with temozolomide. Additional robust prospective studies are warranted to clarify whether the MGMT status should be used in clinical decisions.This project was sponsored, in part, by Schering-Ploug Farma (Portugal). B.M.C. and O.M. are recipients of fellowships from the Portuguese Science and Technology Foundation (SFRH/BPD/33612/2009 and SFRH/BD/36463/ 2007). The funding institutions had no role in the study design, data collection and analysis, interpretation of the results, the preparation of the manuscript, or the decision to submit the manuscript for publication

    Impact of EGFR genetic variants on glioma risk and patient outcome

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    B.M. Costa and M. Viana-Pereira contributed equally to this work; The authors thank the Immunochemotherapy Department of Hospital S. Marcos, and Clinica Laboratorial Dr. Edgar Botelho Moniz, S. Tirso, Portugal, for their helpful assistance in the management of controlsBACKGROUND: The epidermal growth factor receptor (EGFR) regulates important cellular processes and is frequently implicated in human tumors. Three EGFR polymorphisms have been described as having a transcriptional regulatory function: two single-nucleotide polymorphisms in the essential promoter region, -216G/T and -191C/A, and a polymorphic (CA)(n) microsatellite sequence in intron 1. We aimed to elucidate the roles of these EGFR polymorphisms in glioma susceptibility and prognosis. METHODS: We conducted a case-control study with 196 patients with glioma and 168 cancer-free controls. Unconditional multivariate logistic regression models were used to calculate ORs and 95% confidence intervals. A Cox regression model was used to evaluate associations with patient survival. False-positive report probabilities were also assessed. RESULTS: None of the EGFR -216G/T variants was significantly associated with glioma risk. The -191C/A genotype was associated with higher risk for glioma when the (CA)(n) alleles were classified as short for ≤16 or ≤17 repeats. Independently of the (CA)(n) repeat cutoff point used, shorter (CA)(n) repeat variants were significantly associated with increased risk for glioma, particularly glioblastoma and oligodendroglioma. In all tested models with different (CA)(n) cutoff points, only -191C/A genotype was consistently associated with improved survival of patients with glioblastoma. CONCLUSIONS: Our findings implicate EGFR -191C/A and the (CA)(n) repeat polymorphisms as risk factors for gliomas, and suggest -191C/A as a prognostic marker in glioblastoma. Impact: Our data support a role of these EGFR polymorphisms in determining glioma susceptibility, with potential relevance for molecularly based stratification of patients with glioblastoma for individualized therapies.Schering-Plough Farma, PortugalFundação para a Ciência e a Tecnologia (FCT) - SFRH/BPD/33612/2009; SFRH/BD/29145/200
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