Browsing by Issue Date, starting with "2018"
Now showing 1 - 10 of 785
Results Per Page
Sort Options
- Relatório Semestral de Avaliação de Curso TIPC/CP (3001) - 2017-2018Publication . Nobre, CristinaCom este relatório o curso de TIPC/CP (3001) é avaliado nos seus pontos fracos e fortes, durante 1.º semestre do ano letivo de 2017-2018
- Sand smelt ability to cope and recover from ocean's elevated CO 2 levelsPublication . Silva, Cátia S. E.; Lemos, Marco F. L.; Faria, Ana M.; Lopes, Ana F.; Mendes, Susana; Gonçalves, Emanuel J.; Novais, Sara C.Considered a major environmental concern, ocean acidification has induced a recent research boost into effects on marine biodiversity and possible ecological, physiological, and behavioural impacts. Although the majority of literature indicate negative effects of future acidification scenarios, most studies are conducted for just a few days or weeks, which may be insufficient to detect the capacity of an organism to adjust to environmental changes through phenotypic plasticity. Here, the effects and the capacity of sand smelt larvae Atherina presbyter to cope and recover (through a treatment combination strategy) from short (15 days) and long-term exposure (45 days) to increasing pCO2 levels (control: ~515 μatm, pH = 8.07; medium: ~940 μatm, pH = 7.84; high: ~1500 μatm, pH = 7.66) were measured, addressing larval development traits, behavioural lateralization, and biochemical biomarkers related with oxidative stress and damage, and energy metabolism and reserves. Although behavioural lateralization was not affected by high pCO2 exposure, morphometric changes, energetic costs, and oxidative stress damage were impacted differently through different exposures periods. Generally, short-time exposures led to different responses to either medium or high pCO2 levels (e.g. development, cellular metabolism, or damage), while on the long-term the response patterns tend to become similar between them, with both acidification scenarios inducing DNA damage and tending to lower growth rates. Additionally, when organisms were transferred to lower acidified condition, they were not able to recover from the mentioned DNA damage impacts. Overall, results suggest that exposure to future ocean acidification scenarios can induce sublethal effects on early life-stages of fish, but effects are dependent on duration of exposure, and are likely not reversible. Furthermore, to improve our understanding on species sensitivity and adaptation strategies, results reinforce the need to use multiple biological endpoints when assessing the effects of ocean acidification on marine organisms.
- Response surface methodology in the optimization of extraction conditions for Gracilaria gracilis extracts for use in thermoplastic food coatingsPublication . Reboleira, João; Andrade, Mariana A.; Sanches-Silva, Ana; Ganhão, Rui; Mendes, Susana; Vilarinho, Fernanda; Félix, Rafael; Pinheiro, Joaquina; Bernardino, Susana M.Incorporation of antioxidant agents in edible films and packages often relies in the usage of essential oils and other concentrated hydrophobic liquids, with reliable increases in antimicrobial and antioxidant activities of the overall composite, and consequent improvements in product shelf life. These oils are often obtained from plant sources and the usage of organic solvents in their extraction has been criticized as to whether it constitutes a health hazard for consumers [1, 2, 3]. The use of water-soluble antioxidant agents is less common, due to lower activities and extraction yields. As such, using commonly available seaweeds as the source for both the main polymers and the supplementing antioxidant/antimicrobial agents in bioactive films can potentially reduce production costs and create a safer, more sustainable product [1]. Hydroethanolic extracts of commercially available red macroalgae Gracilaria gracilis were evaluated for their antioxidant potential and phenolic content, as part of the preliminary assays for the selection of algal biomass for the enrichment of thermoplastic films. The extracts were obtained through use of solid-liquid extractions, over which yield, DPPH radical reduction capacity, total phenolic content, and FRAP activity assays were measured [4, 5]. Solid to liquid ratio (SLR), extraction time, and ethanol to water ratio were selected as independent variables with experimental ranges and configurations obtained using a Box-Behnken design with three factors, resulting in 15 experimental conditions. Extraction duplicates were used [4]. Response surface methodology was then used to estimate the effect of each extraction condition on the tested bioactivities. Bioactivities were significantly (p<0.05) and positively affected by the presence of ethanol in the extraction solvent, while extraction yield was reduced. Lower solid to liquid ratios (higher solvent proportions) resulted in higher yields, but had no significant (p<0.05) impact on bioactivities. Time was not a relevant factor in any of the measured variables, and as such will be minimized in any further work. 100% ethanol with minimum extraction time (10 minutes) and 1g to 5mL SLR maximize antioxidant activities per gram of dry extract. Maximum ethanolic yields were obtained with a theoretical extraction of 100 minutes and a 1g to 25mL SLR. Aqueous extractions displayed similar results in terms of optimum conditions, but with overall lower bioactivities and higher yields, very likely due to high amounts of soluble polysaccharides. While the high antioxidant activities from the ethanolic extracts encourage the selection of this solvent for extraction of bioactives, low yields may make them later unfeasible. Future studies over the compatibility of these extracts in the polymeric matrix of the films, as well as further optimization of the extraction process will be necessary before the definitive choice for bioactive origin and processing is made.
- Afonso Lopes VieiraPublication . Nobre, CristinaCom os Serões Literários ou Serões de Arte, realizados em Alcobaça em 1913, 1929, 1935 e 1941, Afonso Lopes Vieira institui o património monumental e imemorial português, através da intervenção artística, como instrumento prioritário para a solidificação de uma identidade cultural. Quase 100 anos antes da Convenção-Quadro do Conselho da Europa sobre o Valor do Património Cultural na Sociedade Contemporânea (assinado em Faro, em 2005 e entrado em vigor em 2011), o escritor produziu eventos culturais marcantes para a valorização do património cultural português e do mundo, nomeadamente em Alcobaça.
- Trophic web structure and ecosystem attributes of a temperate coastal lagoonPublication . Bueno-Pardo, Juan; García-Seoane, Eva; Sousa, Ana I.; Coelho, João P.; Morgado, Mariana; Frankenbach, Silja; Ezequiel, João; Vaz, Nuno; Quintino, Victor; Rodrigues, Ana M.; Leandro, Sérgio; Luis, António; Serôdio, João; Cunha, Marina R.; Calado, António J.; Lillebø, Ana; Rebelo, José E.; Queiroga, HenriqueA high quality data collection has been carried out between 2004 and 2014 to develop the first trophic ECOPATH model for the functioning of the sub and intertidal zones of Ria de Aveiro. This schematic representation allows the characterization of the most important compartments of biomass and flows of energy representing the functioning of the ecosystem, and can be used in the fields of decision-making and management. The model considered 26 functional groups from primary producers to top-predators and two different fisheries (artisanal and leisure), and showed that Ria de Aveiro is a dynamic ecosystem dominated by a high biomass of primary producers, where the transference of energy among compartments is, to a large extent, accomplished through the detritus path. The model also provides several ecological indicators on the state of maturity of the ecosystem, showing that Ria de Aveiro is in an intermediate state of maturity with a relatively complex food web and resilience to environmental changes. As discussed, this state of maturity is probably determined by human action pervading the system to advance in the expectable ecological succession of a coastal lagoon. These aspects, together with indicators of elevated fishing pressure and predation within the system, underline the necessity of controlling illegal extraction activities and monitoring the biomass of the main functional groups of the system, especially top predators, in order to keep the functioning of the ecosystem of Ria de Aveiro in its current condition.
- Crianças ao Palco relatório técnico de avaliação do projetoPublication . Milhano, Sandrina Diniz Fernandes; Sousa, Jenny; Magueta, Lúcia; Lopes, Sara
- Manual de apoio – Princípios ergonómicosPublication . Correia, Goreti; Cruz, Joana; Rosa, Marlene
- Uma visão sobre o envelhecimento e a Reabilitação GeriátricaPublication . Rosa, Marlene Cristina Neves
- Desafios da Reabilitação Pediátrica – Volume 2Publication . Rosa, Marlene Cristina Neves
- Contabilidade gerencial hoteleira com exercícios práticosPublication . Gomes, Conceição; Santos, Luís Lima; Faria, Ana Rita; Lunkes, Rogério João; Malheiros, CátiaO presente livro aborda a contabilidade gerencial no setor hoteleiro. Ao iniciar é apresentada a importância do turismo para a economia e o desenvolvimento dos países e, em particular, do setor hoteleiro como um elemento fundamental desta área. São também abordadas características do setor hoteleiro e as bases da contabilidade gerencial, com destaque para o sistema de informação contábil e as demonstrações operacionais do USALI (Uniform System of Accounts for the Lodging Industry). Mais especificamente, são elencados elementos, estrutura e classificações de custos, bem como aspectos relacionados às características do sistema de custos em empresas hoteleiras. Também é apresentada a distribuição e redistribuição de custos indiretos, com descrição do Custeio Baseado em Atividades e o Timedriven activity based costing, e inclui ainda a Gestão Estratégica de Custos (GEC). Na análise do Custo/Volume/Lucro são abordadas as diferentes formas de calcular a margem de contribuição (ex., total, por unidade, além do indicador), bem como o ponto de equilíbrio (ex., em quantidade e em valor) e a margem de segurança. No capítulo final são discutidos aspectos relacionados ao processo de tomada de decisão no setor hoteleiro, com decisões referentes a custos e receitas relevantes, subcontratação, formação de preços das diárias, alimentação e bebidas, revenue management, concluindo com a análise da carta do restaurante.