Recursos de colección

UTL Repository Universidade Técnica de Lisboa (37.462 recursos)

O Repositório Institucional da Universidade Técnica de Lisboa desenvolvido no âmbito do projecto RCAAP. Este repositório destina-se a recolher, preservar e disponibilizar o acesso às publicações científicas e didácticas de seis: Escolas da UTL: Faculdade de Medicina Veterinária, Instituto Superior de Agronomia, Instituto Superior de Economia e Gestão, Instituto Superior de Ciências Sociais e Políticas , Faculdade de Motricidade Humana, Faculdade de Arquitectura. O Instituto Superior Técnico, igualmente Escola Da UTL, tem repositório independente.

Mostrando recursos 1 - 20 de 69

  1. The effect of fruit cultivar/origin and storage time on sorbets quality

    Hipólito, Cátia; Ramalheira, Rosário; Beirão da Costa, Sara; Moldão-Martins, Margarida
    Fruit quality is one of the main factors that influence the sorbets’ quality. The aim of this study was to evaluate the effects of two different cultivars of five fruits (mandarin, lemon, melon and mango) or origin (strawberries) on the overall quality of sorbets, right after being produced and after being preserved for 21 days at 18 C. Total soluble solids (TSS), titratable acidity (TA) and firmness were used to characterize the fruits. Colour, pH, antioxidant capacity (AC) and total phenolic content (TPC), as well as sensory attributes, were evaluated on fruits and respective sorbets. Fruit processing led to a loss of TPC and AC. Nevertheless,...

  2. Kinetics of odorant compounds in wine brandies aged in different systems

    Caldeira, Ilda; Santos, Rui; Ricardo-da-Silva, Jorge M.; Anjos, Ofélia; Mira, Helena; Belchior, A. Pedro; Canas, Sara
    The odorants compounds of aged wine brandies comprise compounds deriving from the wood, from the distillate and from the reactions that occur inside the barrel. The aim of this work was to study the kinetics of the odorant compounds of a wine brandy during two years of ageing in two ageing systems. The odorant compounds in the analysed brandies changed significantly over the time, but with different evolution patterns. The wood related compounds increased over time, with the highest increase in the first months of ageing. The kinetics of cis, trans-b-methyl-c-octalactone, acetovanillone and of seven volatile phenols are established for the first time in brandies. Moreover,...

  3. Phenolic compounds of Galega Vulgar and Cobrançosa olive oils along early ripening stages

    Peres, Fátima; Martins, Luísa Louro; Mourato, Miguel; Vitorino, Conceição; Antunes, Paulo; Ferreira-Dias, Suzana
    In this study, the lipophilic and hydrophilic phenol composition of virgin olive oils (VOO) obtained from olives from two of the most important Portuguese cultivars (‘Galega Vulgar’ and ‘Cobrançosa’), harvested at different ripening stages and under two irrigation schemes (rain fed and irrigated), was evaluated. Phenolic alcohols (hydroxytyrosol and tyrosol), phenolic acids and derivatives and flavonoids (luteolin and apigenin), as well as tocopherols were quantified. Lipophilic (>300 mg kg 1) and hydrophilic phenols (>600 mg kg 1) were present in high contents in both VOO, for early ripening stages. Gamma-tocopherol content is higher in ‘Galega Vulgar’ VOO. Total phenols showed a decrease between ripening index 2.5 and...

  4. The memory of iron stress in strawberry plants

    Gama, Florinda; Saavedra, Teresa; Silva, José Paulo da; Miguel, Maria Graça; Varennes, Amarilis; Correia, Pedro José; Pestana, Maribela
    Research Article

  5. Molecular candidates for early-stage flower-to-fruit transition in stenospermocarpic table grape (Vitis vinifera L.) inflorescences ascribed by differential transcriptome and metabolome profiles

    Domingos, Sara; Fino, Joana; Paulo, Octávio S.; Oliveira, Cristina M.; Goulão, Luís F.
    Flower-to-fruit transition depends of nutrient availability and regulation at the molecular level by sugarand hormone signalling crosstalk. However, in most species, the identities of fruit initiation regulatorsand their targets are largely unknown. To ascertain the main pathways involved in stenospermocarpictable grape fruit set, comprehensive transcriptional and metabolomic analyses were conducted specifi-cally targeting the early phase of this developmental stage in ‘Thompson Seedless’. The high-throughputanalyses performed disclosed the involvement of 496 differentially expressed genes and 28 differentlyaccumulated metabolites in the sampled inflorescences. Our data show broad transcriptome reprogram-ming of molecule transporters, globally down-regulating gene expression, and suggest that regulation ofsugar- and...

  6. Mapping portuguese Natura 2000 sites in risk of biodiversity change caused by atmospheric nitrogen pollution

    Pinho, Pedro; Dias, Teresa; Cordovil, Cláudia; Dragosits, Ulrike; Dise, Nancy B.; Sutton, Mark A.; Branquinho, Cristina
    In this paper, we assess and map the risk that atmospheric nitrogen (atN) pollution poses to biodiversity in Natura 2000 sites in mainland Portugal. We first review the ecological impacts of atN pollution on terrestrial ecosystems, focusing on the biodiversity of Natura 2000 sites. These nature protection sites, especially those located within the Mediterranean Basin, are under-characterized regarding the risk posed by atN pollution. We focus on ammonia (NH ) because this N form is mostly associated with agriculture, which co-occurs at or in the immediate vicinity of most areas of conservation interest in Portugal. We produce a risk map integrating NH emissions and the...

  7. Differential proteomic analysis of lactic acid bacteria - Escherichia coli O157:H7 interaction and its contribution to bioprotection strategies in meat

    Orihuel, Alejandra; Terán, Lucrecia; Renaut, Jenny; Vignolo, Graciela M.; Almeida, André M. de; Saavedra, Maria L.; Fadda, Silvina
    Original Research

  8. Potential health risk of endocrine disruptors in construction sector and plastics industry: a new paradigm in occupational health

    Fucic, Aleksandra; Galea, Karen S.; Duca, Rade Corneliu; El Yamani, Mounia; Frery, Nadine; Godderis, Lode; Halldorsson, Thorhallur; Iavicoli, Ivo; Ndaw, Sophie; Ribeiro, Edna; Viegas, Susana; Moshammer, Hanns
    Endocrine disruptors (EDs) belong to large and diverse groups of agents that may cause multiple biological effects associated with, for example, hormone imbalance and infertility, chronic diseases such as diabetes, genome damage and cancer. The health risks related with the exposure to EDs are typically underestimated, less well characterized, and not regulated to the same extent as, for example, carcinogens. The increased production and utilization of identified or suspected EDs in many different technological processes raises new challenges with respect to occupational exposure settings and associated health risks. Due to the specific profile of health risk, occupational exposure to EDs demands a new paradigm in health risk...

  9. Evapotranspiration partition and crop coefficients of Tifton 85 bermudagrass as affected by the frequency of cuttings. Application of the FAO56 Dual Kc Model

    Paredes, Paula; Rodrigues, Geraldo J.; Petry, Mirta T.; Severo, Paula O.; Carlesso, Reimar; Pereira, L.S.

  10. Modeling soil water dynamics and pasture growth in the montado ecosystem using MOHID land

    Simionesei, Lucian; Ramos, Tiago B.; Oliveira, Ana R.; Jongen, Marjan; Darouich, Hanaa; Weber, Kirsten; Proença, Vânia; Domingos, Tiago; Neves, Ramiro
    The southern Iberian Peninsula is characterized by evergreen oak woodlands (locally known as montado), which constitute an important savanna-type agro-silvo-pastoral ecosystem. This ecosystem is facing a progressive decline for several reasons, with the foremost being overgrazing. Better management tools are necessary to accurately quantify the systems’ carrying capacity and the sustainable stocking rates that prevent land degradation. The purpose of this study was to determine whether the MOHID-Land model could adequately simulate soil water dynamics and pasture growth in the montado ecosystem. The study area was located in the Alentejo region of southern Portugal. The model successfully simulated soil water contents and aboveground biomass during the 2010–2011 and...

  11. Ecological and ecotoxicological responses in the assessment of the ecological status of freshwater systems: A case study of the temporary stream Brejo of Cagarrão (South of Portugal)

    Palma, P.; Matos, C.; Alvarenga, P.; Kock-Schulmeyer, M.; Simões, I.; Barceló, D.; López de Alda, M.J.
    The objective of the study was to assess the integrated use of macroinvertebrate indexes and ecotoxicological parameters in the evaluation of the ecological status of a temporary stream with a strong agricultural influence. Water quality was analysed at two sampling sites along the stream, considering: chemical supporting parameters; hazardous substances (pesticides); benthic macroinvertebrate communities, through quality (Iberian Biological Monitoring Working Party and Iberian Average Score Per Taxon) and multi-metric indices (Southern Portuguese Index of Invertebrates and Ecological Quality Ratio); and ecotoxicological responses using lethal and sub-lethal bioassays. The water chemical characterization showed high levels of organic matter and nutrients, mainly in the dry period ((biochemical oxygen demand...

  12. Genetic and genomic tools to assist sugar beet improvment: the value of the crop wild relatives

    Monteiro, Filipa; Frese, Lothar; Castro, Sílvia; Duarte, Maria C.; Paulo, Octávio S.; Loureiro, João; Romeiras, Maria M.

  13. Can elevated air (CO2) conditions mitigate the predicted warming impact on the quality of coffee bean ?

    Ramalho, José C.; Pais, Isabel P.; Leitão, António E.; Guerra, Mauro; Reboredo, Fernando H.; Máguas, Cristina M.; Carvalho, Maria L.; Scotti-Campos, Paula; Ribeiro-Barros, Ana I.; Lidon, Fernando J.C.; DaMatta, Fábio M.
    Original Research

  14. Physiological and agronomical responses to environmental fluctuations of two portuguese grapevine varieties during three field seasons

    Carvalho, Luísa C.; Coito, João L.; Gonçalves, Elsa F.; Lopes, Carlos; Amâncio, Sara
    Extensive agricultural losses are attributed to heat, often combined with drought. These abiotic stresses occur in the field simultaneously, namely in areas with Mediterranean climate, where grapevine traditionally grows. The available scenarios for climate change suggest an increase in the frequency of heat waves and severe drought events in summer, also affecting the South of Portugal. In this work we monitored several productionrelated parameters and evaluated the state of the oxidative stress response apparatus of two grapevine varieties, Touriga Nacional (TN) and Trincadeira (TR), with and without irrigation, during three field seasons (2010 to 2012). Overall, results point to a high correlation of most...

  15. Olive tree (Olea europaea L.) diversity in traditional small farms of Ficalho, Portugal

    Veloso, Maria Manuela; Simões-Costa, Maria Cristina; Carneiro, Luís C.; Guimarães, Joana B.; Mateus, Célia; Fevereiro, Pedro; Pinto-Ricardo, Cândido
    The genetic diversity of “Gama” and “Bico de Corvo”, local cultivars of olive tree (Olea europaea) from seven traditional orchards of Ficalho (Alentejo region, Portugal), was studied to characterize the local diversity and assess the level of on farm diversity. Two different analytical systems were used: endocarp morphological characteristics and genetic analysis by microsatellite markers (Simple Sequence Repeats or SSR). The seven screened loci were polymorphic and allowed the identification of 23 distinct SSR profiles within the 27 trees analyzed. A total of 52 different alleles were scored, with an average of 7.43 alleles/SSR locus, and considerable genetic diversity was found. Neighbor-Joining algorithm cluster analysis and principal...

  16. Fusion proteins towards fungi and bacteria in plant protection

    Pinheiro, Ana Margarida; Carreira, Alexandra; Ferreira, Ricardo B.; Monteiro, Sara
    Research Article

  17. Basin irrigation design with multi-criteria analysis focusing on water saving and economic returns: application to wheat in Hetao, Yellow River basin

    Miao, Quingfeng; Shi, Haibin; Gonçalves, José M.; Pereira, L.S.
    The sustainability of the Hetao Irrigation System, located in the water scarce upper Yellow River basin, is a priority considering the need for water saving, increased water productivity, and higher farmers’ incomes. The upgrading of basin irrigation, the main irrigation method, is essential and includes the adoption of precise land levelling, cut-off management, improved water distribution uniformity, and adequate irrigation scheduling. With this objective, the current study focuses on upgrading wheat basin irrigation through improved design using a decision support system (DSS) model, which considers land parcels characteristics, crop irrigation scheduling, soil infiltration, hydraulic simulation, and environmental and economic impacts. Its use includes outlining water saving scenarios and...

  18. Phylogenetic relationships and phylogeography of relevant lineages within the complex Campanulaceae family in Macaronesia

    Menezes, Tiago; Romeiras, Maria M.; Sequeira, Miguel M.; Moura, Mónica
    Original Research

  19. Comparative metagenomics reveals the distinctive adaptive features of the Spongia officinalis endosymbiotic consortium

    Karimi, Elham; Ramos, Miguel; Gonçalves, Jorge M.S.; Xavier, Joana R.; Reis, Margarida P. Reis; Costa, Rodrigo
    Original Research

  20. Characterization of the primary matabolome of Brachystegia boehmii and Colophospermum mopane under different fire regimes in Miombo and Mopane African woodlands

    Duvane, Jossias A.; Jorge, Tiago F.; Maquia, Ivete; Ribeiro, Natasha; Ribeiro-Barros, Ana I.F.; António, Carla
    Original Research

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