Mostrando recursos 1 - 20 de 297

  1. Survival and growth of Cronobacter sakazakii on fresh-cut fruit and the effect of UV-C illumination and electrolyzed water in the reduction of its population

    Santo, David; Graça, Ana; Nunes, Carla; Quintas, Célia
    Cronobacter sakazakii, found in foods such as powdered infant formula and plant origin ready-to-eat food, is an opportunistic pathogen to infants, neonates and vulnerable adults. The objective of this study was to monitor the growth of C. sakazakii in fresh-cut 'Royal gala' apple, 'Rocha' pear, and 'Piel de sapo' melon, and the effect of UV-C illumination, acidic electrolyzed water (AEW) and neutral electfolyzed water (NEW) in the reduction of its population. Fresh-cut fruits were inoculated and incubated at different temperatures during 10 days while monitoring C. sakazakii. The inhibitory activity of different doses of UV-C (0-10 kj.m(2)), electrolyzed water and...

  2. Potentiation of Bioactive Compounds and Antioxidant Activity in Artisanal Honeys Using Specific Heat Treatments

    Pimentel-Gonzalez, D. J.; Jimenez-Alvarado, R.; Hernandez-Fuentes, A. D.; Figueira, Ana C.; Suarez-Vargas, A.; Campos-Montiel, R. G.
    The effect of temperature on the phenol content, flavonoids content, hydroxymethylfurfural (HMF) and antioxidant activity (DPPH and ABTS) in five artisanal honeys of different floral origins was investigated. The total phenol and total flavonoid content showed either linear or quadratic curves (P<0.05) for heat treatment according to the origin of the honey. For HMF, all of the honeys displayed linear behavior with the heat treatments. All of the honeys had linear responses to temperature (P<0.05) and antioxidant activity as measured by DPPH. The antioxidant activity measured as the ABTS showed either a linear or quadratic (P<0.05) curve response depending on...

  3. The effect of NaCl reduction in the microbiological quality of cracked green table olives of the Macanilha Algarvia cultivar

    Mateus, Tânia; Santo, David; Saúde, Cíntia; Pires-Cabral, Paula; Quintas, Célia
    The present work aimed at studying the effect of the partial replacement of NaCl with KCl and CaCl2 of the fermenting brines on the microbiological quality of natural cracked green Macanilha Algarvia table olives. Olives were fermented in different salt combinations (Brine 1-8% NaCl, Brine 2-4% NaCl 4% KCl, Brine 3-4% NaCl 4% CaCl2, Brine 4-4% KCl 4% CaCl2, and Brine 5-2.7% NaCl 2.7% KCl 2.7% CaCl2) and the abundance of yeasts and enterobacteria was determined. At the end of fermentation, the main microbial safety parameters were evaluated. Samples were analyzed according to standard methodologies and using Chromocult Agar (coliforms...

  4. Data gathering in wireless sensor networks using unmanned aerial vehicles

    Mazayev, Andriy; Correia, Noélia; Schutz, G.
    In an IoT world sensor-enabled systems are all around us and accessible for management at any time and place. Besides other technological components, small unmanned aerial vehicles are also expected to have an important role in IoT as they fly at low-altitude becoming suitable data acquisition vehicles in certain situations. In this article we focus on data gathering using unmanned aerial vehicles for applications having delivery limit constraints. The problem is to design an efficient set of paths to gather sensor data at specific places, and to deliver it at the sink node, while accomplishing the delivery limit associated with...

  5. Dynamic aggregation and scheduling in CoAP/Observe-based wireless sensor networks

    Correia, Noélia; Sacramento, David; Schutz, G.
    Wireless sensor networks (WSNs) are starting to have a high impact on our societies and, for next generation WSNs to become more integrated with the Internet, researchers recently proposed to embed IPv6 into such very constrained networks. Also, constraint application protocol (CoAP) and Observe have been proposed for RESTful services to be provided. CoAP/Observe supports the use of caches/proxies and, for this reason, an observation request may resort to multiple client/server registration steps in order to get notifications. Here, we propose to plan the multiple registration steps, at proxies, of multiple observation requests in order to make proper aggregation/scheduling of...

  6. Acoustic Channel Frequency Response Estimation Using Sources of Opportunity

    Santos, Ana Bela; Felisberto, P.; Jesus, S. M.
    This work addresses the usage of ship radiated noise to estimate the ocean acoustic water propagation channel response between two vertical line arrays. We derive an expression for the frequency response channel estimate using a normal mode development based on cross-correlation methods, in a similar way as Roux et al. [1]. Its applicability and limitations in simulated and real conditions is discussed. Simulations are conducted using the normal mode model KRAKEN, based on the experimental setup and environmental parameters gathered during the RADAR' 07 sea trial, off the west coast of Portugal, in July of 2007. In this sea trial...

  7. An energy-aware resource design model for constrained networks

    Correia, N.; Schutz, G.; Mazayev, A.; Martins, J.; Barradas, Álvaro
    The Internet of Things is expected to incorporate objects and sensor networks of all kinds, and in particular, constrained sensor networks where energy consumption is a critical issue. In order to increase the lifetime of such networks, intelligent and standard-based solutions should be used. Here, we address this challenge through the use of CoRE interfaces for the resource design. These interfaces allow the server side to compose/organize resources and the client side to discover and determine how to consume such resources, besides allowing decisions to be easily integrated into the operation of the network. An energy-aware resource design model is...

  8. Soil erosion, Serra de Grandola (Portugal)

    Fernandez, Helena; Martins, Fernando; Isidoro, Jorge; Zavala, Lorena; Jordan, Antonio
    Soil erosion has long been the subject of attention for environmental management researchers because it implies the loss of a key natural resource for sustaining life. Several methodologies for soil erosion assessment have been developed; many of these are supported by Geographic Information Systems. This study aims to classify the susceptibility of rainfall-induced erosion at the Serra de Grandola (Portugal), based on the Priority Actions Programme/Regional Activity Centre guidelines for mapping soil erosion on the Mediterranean coast. Results show a low-to-moderate susceptibility to rainfall-induced erosion in the lowlands, becoming moderate to high in the highlands of the Serra de Grandola.

  9. Classification of landforms in Southern Portugal (Ria Formosa Basin)

    Martins, Fernando; Fernandez, Helena; Isidoro, Jorge; Jordan, Antonio; Zavala, Lorena
    A Geographic Information Systems-based tool is used for macro-landform classification following the Hammond procedure, based upon a Digital Terrain Model (DTM) created from ordinary Kriging. Gentle slopes, surface curvature, highlands and lowlands areas are derived from the DTM. Combining this information allows the classification of terrain units (landforms). The procedure is applied to the Ria Formosa basin (Southern Portugal), with five different terrain types classified (plains, tablelands, plains with hills, open hills and hills).

  10. Almadrava: men and sea. Social relationship in a short-term community

    Batista, Nuno Miguel; Gonçalves, Marta
    Introduction: Description of the relationship men/sea, on a specific social and life context, in a fishing community temporarily settled in Faro beach, during the tuna fishing period. It was discovered that such a fishing community existed for long decades in this place, where almost 200 families lived only during tuna’s fishing season. This community only had limited and rudimentary resources, based exclusively on human strength. Nevertheless, they developed their own rituals, beliefs and way of living. Now everything is almost extinct. Objective: Report the specificities of the spatial organization and socio-economic relations of this Armação, encouraging the generational continuity, the awareness of this disappeared heritage, its...

  11. Renewing terraces and drystone walls of Algarvian Barrocal. Cultural and touristic values

    Gonçalves, Marta; Prates, Gonçalo Nuno Delgado; Rosendahl, Stefan
    This paper aims to enhance the functions of terraces and drystone walls as structural elements and distinctive factors of the traditional rural zone known as the barrocal of the Algarve, south of Portugal. In fact, such elements define the character of the landscape that forms the background of a traditional touristic region along the coast. The core of this paper will be the knowledge of construc-tion processes, spatial distribution, and hydrological, ecological, economic and social functions, once it is quite necessary for the Algarve region. Some projects and studies have been developed in the Mediterranean context, but there is not...

  12. Ritual of blessing the tuna fishing nets in Algarve (Portugal), between the 30's and 60's

    Batista, Nuno; Gonçalves, Marta
    This paper describes the religious blessing procedure of tuna fishing nets before being launched into the sea, in Algarve, between the decades 30 and 60, when it abruptly ended. The authors describe how blessing of tuna fishing nets was made, based on interviews with peo-ple involved in this art, using photos provided by those, complemented by documentary analysis and bibliographic research. In the course of the work it was discovered that such religious prac-tice took place in Faro beach, in Algarve, for long decades, involving almost 200 families that lived there temporarily for 4 months per year, each year. The...

  13. Atributos de paragens de autocarro acessíveis

    Rosa, Maria Manuela Pires; Landim, Isabel
    O turismo acessível atende ao desenvolvimento de atividades turísticas por todas as pessoas, e considera as necessidades das que têm mobilidade reduzida. Acontece que no ambiente urbano e turístico há um conjunto de barreiras físicas que dificultam a mobilidade dos turistas com trolleys, dos pais com carrinhos de bebé e das pessoas com deficiência. Neste contexto, surgiu o conceito de “design universal” que assegura os direitos de acessibilidade a todos, incluindo as pessoas com necessidades especiais. De acordo com o Conceito Europeu de Acessibilidade "a acessibilidade é a característica de um meio físico ou de um objeto que permite a...

  14. Atributos de paragens de autocarro acessíveis

    Rosa, Maria Manuela Pires; Landim, Isabel
    O turismo acessível atende ao desenvolvimento de atividades turísticas por todas as pessoas, e considera as necessidades das que têm mobilidade reduzida. Acontece que no ambiente urbano e turístico há um conjunto de barreiras físicas que dificultam a mobilidade dos turistas com trolleys, dos pais com carrinhos de bebé e das pessoas com deficiência. Neste contexto, surgiu o conceito de “design universal” que assegura os direitos de acessibilidade a todos, incluindo as pessoas com necessidades especiais. De acordo com o Conceito Europeu de Acessibilidade "a acessibilidade é a característica de um meio físico ou de um objeto que permite a...

  15. Proposta metodológica para avaliação da acessibilidade universal em percursos pedonais: o caso do centro histórico de Faro

    Rosa, Maria Manuela Pires; Landim, Isabel; Loureiro, Nuno de Santos
    Num contexto de turismo acessível é necessária a existência de redes pedonais que detenham um conjunto de atributos de qualidade que garantam usabilidade por todos os cidadãos. Garantir um meio físico acessível é considerado um critério de qualidade, que torna as deslocações pedonais mais agradáveis, não só para idosos e pessoas com deficiência, mas para toda a população residente e turistas. No estudo de caso averigua-se se as características físicas das infraestruturas pedonais, de interesse cultural, localizadas no Centro Histórico de Faro, respeitam as exigências do Regime Jurídico Nacional da Acessibilidade. Formula-se uma metodologia de avaliação da acessibilidade universal das...

  16. Proposta metodológica para avaliação da acessibilidade universal em percursos pedonais: o caso do centro histórico de Faro

    Rosa, Maria Manuela Pires; Landim, Isabel; Loureiro, Nuno de Santos
    Num contexto de turismo acessível é necessária a existência de redes pedonais que detenham um conjunto de atributos de qualidade que garantam usabilidade por todos os cidadãos. Garantir um meio físico acessível é considerado um critério de qualidade, que torna as deslocações pedonais mais agradáveis, não só para idosos e pessoas com deficiência, mas para toda a população residente e turistas. No estudo de caso averigua-se se as características físicas das infraestruturas pedonais, de interesse cultural, localizadas no Centro Histórico de Faro, respeitam as exigências do Regime Jurídico Nacional da Acessibilidade. Formula-se uma metodologia de avaliação da acessibilidade universal das...

  17. Optimization of processing conditions of traditional cured tuna Loins–Muxama

    Esteves, Ezequiel; Aníbal, J.
    Muxama is a traditional highly-valued food product prepared from dry-cured tuna loins in southern Portugal and Spain. The production procedure has seen little change over the last centuries. The muxama’s stability is due to reduced water activity. In addition, the drying method has secondary effects on characteristics of flavor, color, and the nutritional value of the product. Our objectives were to describe the dynamics of important physicochemical parameters such as moisture content, water activity (aW), NaCl concentration (as water–phase salt, ZNaCl), pH and color, during the salting and drying stages of muxama production, and to test the effect(s) of changes...

  18. Cultural accessible tourism in Algarve region, case of study

    Rodrigues, Ana; Rosa, Maria Manuela Pires; Rebelo, Efigénio
    This article analyse the new trends in cultural tourism, namely at the Portuguese Algarve region. Algarve is internationally known as a “Sun & Beach” destination. However, the new trends in Algarve tourism are associated with segments linked to unique and local aspects, such as: the landscape, the gastronomy, the rural and the urban heritage. Actually, the local culture consists an important variable to improve satisfaction and to create experiences for the Algarve visitors. The accessible tourism is a segment referenced in the Algarve tourism strategy. The project “Accessible beaches/beaches for all”, the “Requalification Plan of Vilamoura Downtown Resort” and the...

  19. Cultural accessible tourism in Algarve region, case of study

    Rodrigues, Ana; Rosa, Maria Manuela Pires; Rebelo, Efigénio
    This article analyse the new trends in cultural tourism, namely at the Portuguese Algarve region. Algarve is internationally known as a “Sun & Beach” destination. However, the new trends in Algarve tourism are associated with segments linked to unique and local aspects, such as: the landscape, the gastronomy, the rural and the urban heritage. Actually, the local culture consists an important variable to improve satisfaction and to create experiences for the Algarve visitors. The accessible tourism is a segment referenced in the Algarve tourism strategy. The project “Accessible beaches/beaches for all”, the “Requalification Plan of Vilamoura Downtown Resort” and the...

  20. Ambiente construído e mobilidade em cidades de média dimensão

    Vale, David Sousa; Alves, Rui; Bento, Ricardo Jorge e Silva; Rosa, Maria Manuela Pires; Pereira, Mauro F.
    A relação entre as características do ambiente construído e a mobilidade dos habitantes tem sido amplamente estudada. No entanto, a maioria desta investigação tem-se debruçado sobre contextos metropolitanos, e pouco se sabe sobre esta relação nas cidades de média dimensão, as quais possuem características de mobilidade muito próprias. Por um lado, a sua dimensão reduzida permite que grande parte das deslocações possa ser realizada a pé, mas por outro, o reduzido nível de tráfego e a fraca oferta de transportes públicos promovem as deslocações em veículo individual. Este artigo foca-se na relação entre características do ambiente construído e a mobilidade...

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