Recursos de colección

UTL Repository Universidade Técnica de Lisboa (33.871 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.

ISA - Instituto Superior de Agronomia

Mostrando recursos 1 - 20 de 32

  1. Reserva Botânica D. António Xavier Pereira Coutinho


  2. As colecções do Parque Botânico da Tapada da Ajuda

    Soares, Ana Luísa; Lopes, Carlos; Oliveira, Cristina; Mota, Mariana; Soares, Paula; Espírito Santo, M.D.

  3. Conservação in situ e ex situ no Parque Botânico da Tapada da Ajuda

    Vasconcelos, Teresa; Forte, Paulo; Fernandes, Isabel

  4. Diversidade arbórea no Parque Botânico da Tapada da Ajuda

    Vasconcelos, Teresa; Forte, Paulo; Arsénio, Pedro; Soares, Ana Luísa

  5. Onions: a source of flavonoids

    Rodrigues, Ana Sofia; Almeida, Domingos P.F.; Simal-Gándara, Jesus; Pérez-Gragorio, Maria Rosa
    Flavonoids are a large and diverse group of polyphenolic compounds with antioxidant effects, and onion (Allium cepa L.) is one of the richest sources of dietary flavonoids. Flavonoid content is affected by endogenous factors—genotype and agro-environmental conditions. Considerable research has been directed toward understanding the nature of polyphenols in different products and the factors influencing their accumulation. This review examines the impacts of pre- and postharvest factors on onions’ flavonoid content, highlighting how this knowledge may be used to modulate their composition and the potential use of onion by-products

  6. Agroforestry in Europe. Practice, research and policy

    Burgess, Paul; Herder, Michael den; Moreno, Gerardo; Pantera, Anastasia; Kanzler, Michael; Hermansen, John; Palma, J.H.N.; Plieninger, Tobias; Kay, Sonia; Mosquera-Losada, Rosa; Liagre, Fabien
    Agroforestry in Europe: Practice, Research and Policy Content 1. The practice of agroforestry in Europe 2.Some research from the AGFORWARD project 3.Some important policy issues

  7. 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

  8. Shelf-life of reduced-fat white chocolate fillings using iota-carrageenan

    Dias, João; Alvarenga, Nuno; Sousa, Isabel
    Regular Article

  9. Milk production as an indicator of drought vulnerability of cities located in the brazilian semiarid region

    Andrade, Tafnes da S.; Cunha, John E. de B.L.; Galvão, Carlos de O.; Rufino, Iana A.A.
    Several spectral indices have been used to estimate droughts, however, these indicators only give evidence of a dry spell leaving out its impacts on significant economic activities performed in a given region. In this context, livestock breeding in one of the most important activities to analyze in the Brazilian semiarid region. The aim of this study was to evaluate the relationship between the drought indices, obtained through remote sensory devices, and annual milk production (2004 – 2014), identifying the most affected cities by the drought and were considered the most vulnerable and in need of special attention during dry periods....

  10. Burned area mapping in the brazilian savanna using a one-class support vector machine trained by active fires

    Pereira, Allan A.; Pereira, José Miguel Cardoso; Libonati, Renata; Oom, Duarte; Setzer, Alberto W.; Morelli, Fabiano; Machado-Silva, Fausto; Carvalho, Luís Marcelo Tavares de
    We used the Visible Infrared Imaging Radiometer Suite (VIIRS) active fire data (375 m spatial resolution) to automatically extract multispectral samples and train a One-Class Support Vector Machine for burned area mapping, and applied the resulting classification algorithm to 300-m spatial resolution imagery from the Project for On-Board Autonomy-Vegetation (PROBA-V). The active fire data were screened to prevent extraction of unrepresentative burned area samples and combined with surface reflectance bi-weekly composites to produce burned area maps. The procedure was applied over the Brazilian Cerrado savanna, validated with reference maps obtained from Landsat images and compared with the Collection 6 Moderate Resolution Imaging Spectrometer (MODIS) Burned Area product (MCD64A1)...

  11. Disturbance distance: quantifying forests' vulnerability to disturbance under current and future conditions

    Dolan, Katelyn A.; Hurtt, George C.; Flanagan, Steve A.; Fisk, Justin P.; Sahajpal, Ritvik; Huang, Chengquan; Le Page, Yannick; Dubayah, Ralph; Masek, Jeffrey G.
    Disturbances, both natural and anthropogenic, are critical determinants of forest structure, function, and distribution. The vulnerability of forests to potential changes in disturbance rates remains largely unknown. Here, we developed a framework for quantifying and mapping the vulnerability of forests to changes in disturbance rates. By comparing recent estimates of observed forest disturbance rates over a sample of contiguous US forests to modeled rates of disturbance resulting in forest loss, a novel index of vulnerability, Disturbance Distance, was produced. Sample results indicate that 20% of current US forestland could be lost if disturbance rates were to double, with southwestern forests showing highest vulnerability. Under a future climate...

  12. Importance of considering riparian vegetation requirements for the long-term efficiency of environmental flows in aquatic microhabitats

    Rivaes, Rui; Boavida, Isabel; Santos, José M.; Pinheiro, António N.; Ferreira, Maria Teresa
    Environmental flows remain biased toward the traditional biological group of fish species. Consequently, these flows ignore the inter-annual flow variability that rules species with longer lifecycles and therefore disregard the long-term perspective of the riverine ecosystem. We analyzed the importance of considering riparian requirements for the long-term efficiency of environmental flows. For that analysis, we modeled the riparian vegetation development for a decade facing different environmental flows in two case studies. Next, we assessed the corresponding fish habitat availability of three common fish species in each of the resulting riparian landscape scenarios. Modeling results demonstrated that the environmental flows disregarding riparian vegetation requirements promoted riparian degradation, particularly vegetation encroachment. Such circumstance altered the hydraulic characteristics...

  13. Functional redundancy and sensitivity of fish assemblages in European rivers, lakes and estuarine ecosystems

    Teichert, Nils; Lepage, Mario; Sagouis, Alban; Borja, Angel; Chust, Guillem; Ferreira, Maria Teresa; Pasquaud, Stéphanie; Schinegger, Rafaela; Segurado, Pedro; Argillier, Christine
    The impact of species loss on ecosystems functioning depends on the amount of trait similarity between species, i.e. functional redundancy, but it is also influenced by the order in which species are lost. Here we investigated redundancy and sensitivity patterns across fish assemblages in lakes, rivers and estuaries. Several scenarios of species extinction were simulated to determine whether the loss of vulnerable species (with high propensity of extinction when facing threats) causes a greater functional alteration than random extinction. Our results indicate that the functional redundancy tended to increase with species richness in lakes and rivers, but not in estuaries. We demonstrated that i) in the three...

  14. Comprehensive analysis of the cork oak (Quercus suber) transcriptome involved in the regulation of bud sprouting

    Usié, Ana; Simões, Fernanda; Barbosa, Pedro; Meireles, Brígida; Chaves, Inês; Gonçalves, Sónia; Folgado, André; Almeida, Maria Helena; Matos, José; Ramos, António M.
    Cork oaks show a high capacity of bud sprouting as a response to injury, which is important for species survival when dealing with external factors, such as drought or fires. The characterization of the cork oak transcriptome involved in the different stages of bud sprouting is essential to understanding the mechanisms involved in these processes. In this study, the transcriptional profile of different stages of bud sprouting, namely (1) dormant bud and (2) bud swollen, vs. (3) red bud and (4) open bud, was analyzed in trees growing under natural conditions. The transcriptome analysis indicated the involvement of genes related with energy production (linking the TCA...

  15. 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

  16. 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

  17. Synergy between land use and climate change increases future risk in Amazon forests

    Le Page, Yannick; Morton, Douglas; Hartin, Corinne; Bond-Lamberty, Ben; Pereira, José Miguel Cardoso; Hurtt, George; Asrar, Ghassem
    Tropical forests have been a permanent feature of the Amazon basin for at least 55 million years, yet climate change and land use threaten the forest’s future over the next century. Understory forest fires, which are common under the current climate in frontier forests, may accelerate Amazon forest losses from climatedriven dieback and deforestation. Far from land use frontiers, scarce fire ignitions and high moisture levels preclude significant burning, yet projected climate and land use changes may increase fire activity in these remote regions. Here, we used a fire model specifically parameterized for Amazon understory fires to examine the interactions between anthropogenic activities and climate under...

  18. Conhecer as rolhas de cortiça: exterior, interior e permeabilidade ao oxigénio em garrafa

    Oliveira, Vanda

  19. A importância da origem das plantas de sobreiro na arborização

    Almeida, Helena

  20. A formação e a qualidade da cortiça

    Graça, José

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