Recursos de colección

Repositório do Instituto Politénico de Castelo Branco (13.947 recursos)

O Repositório Científico do Instituto Politécnico de Castelo Branco tem como objectivos fundamentais a divulgação, a preservação em formato digital e a partilha do conhecimento científico gerado na instituição, constituindo-se numa ferramenta de valor acrescentado porque permite aumentar a visibilidade e o impacto da investigação desenvolvida.

ESACB - Artigos em revistas com arbitragem científica

Mostrando recursos 1 - 20 de 114

  1. Influence of Heartwood on Wood Density and Pulp Properties Explained by Machine Learning Techniques

    Iglesias, C.; Santos, A.J.A.; Martínez, J.; Pereira, H.; Anjos, O.
    The aim of this work is to develop a tool to predict some pulp properties e.g., pulp yield, Kappa number, ISO brightness (ISO 2470:2008), fiber length and fiber width, using the sapwood and heartwood proportion in the raw-material. For this purpose, Acacia melanoxylon trees were collected from four sites in Portugal. Percentage of sapwood and heartwood, area and the stem eccentricity (in N-S and E-W directions) were measured on transversal stem sections of A. melanoxylon R. Br. The relative position of the samples with respect to the total tree height was also considered as an input variable. Different configurations were...

  2. Preliminary characterization of a Moroccan honey with a predominance of Bupleurum spinosum pollen

    Elamine, Y.; Aazza, S.; Lyoussi, B.; Antunes, M.D.; Estevinho, L.M.; Anjos, O.; Resende, M.; Faleiro, M.L.; Miguel, M.G.
    Honey with Bupleurum spinosum (zandaz) as a main pollen source has not been the subject of previous detailed study. Therefore, twelve Moroccan samples of this honey were subjected to melissopalynological, physicochemical and micro-biological quality characterization, as well as antioxidant activity assessment. From a quality point of view, almost all samples were within the limits established by Codex Alimentarius, and/or the European legislation. All samples presented predominance of B. spinosum pollen (more than 48%). Relatively high levels of trehalose (1.3–4.0 g/100 g) and elezitose (1.5–2.8 g/100 g) were detected. Those sugars, not common in monofloral honeys, could be used as na...

  3. Mesenteric lymph node granulomatous lesions in naturally infected wild boar (Sus scrofa) in Portugal--Histological, immunohistochemical and molecular aspects

    Matos, A.C.; Andrade, S.; Figueira, L.; Matos, M.; Pires, M.A.; Coelho, A.C.; Pinto, M.L.
    Several studies have demonstrated that wildlife reservoirs of mycobacteria are responsible for the maintenance and spreading of the infection to livestock and wildlife counterparts. Recent data report the role of wild boar (Sus scrofa) as a reservoir for Mycobacterium bovis. This study was conducted to evaluate the chronic inflammatory response in the mesenteric lymph nodes (MLN) of wild boar with granulomatous lymphadenitis (n=30). Morphological parameters of the lesions were recorded. The expression of CD3 and CD79α molecules was evaluated by immunohistochemistry. Molecular genotyping and culture to identify mycobacteria were performed. The lesions consisted mainly of stage III and stage IV...

  4. Detection of Mycobacterium avium subsp. paratuberculosis in kidney samples of red deer (Cervus elaphus) in Portugal: Evaluation of different methods

    Matos, A.C.; Figueira, L.; Martins, M.H.; Matos, M.; Álvares, S.; Mendes, A.; Pinto, M.L.; Coelho, A.C.
    Paratuberculosis or Johne's disease, caused by Mycobacterium avium subsp. paratuberculosis (Map), is a chronic granulomatous enteritis affecting both domestic and wild ruminants. The present work is part of a wider set of studies designed to assess the prevalence of paratuberculosis in free ranging red deer (Cervus elaphus). With that purpose, 877 free-ranging red deer legally hunted in the Centre-eastern Portugal were submitted to necropsy and sampled for molecular methods, microbiology and histopathology. Thirty-seven (4.2%) kidneys revealed acid-fast bacilli when screened with the Ziehl-Neelsen technique. Map was detected by IS900 polymerase chain reaction (PCR) in thirty (81.1%) of the Ziehl-Neelsen positive...

  5. Serological survey for antibodies against Mycobacterium avium complexin hunting dogs in East-Central Portugal

    Coelho, A.C.; Matos, M.; Figueira, L.; Pinto, M.L.; Garcia Diez, J.; Matos, A.C.
    The Mycobacterium avium complex (MAC) causes infections and diseases in humans, birds, livestock, and wildlife, among others. In dogs, MAC infection is not frequent; however, due to its potential zoonotic characteristics, mainly in immunocompromised patients, the study of MAC epidemiology is necessary. The aim of this work was to perform a study to detect the presence of antibodies against MAC in serum samples of 53 hunting dogs in the Idanha-a-Nova municipality of East-Central Portugal. A total of 23 dogs were seropositive by commercial ELISA test (43.4%, 95% CI: 30.1%–56.7%). Factors such as age, breed, and sex were not significant. The...

  6. Genetic diversity and divergence at the Arbutus unedo L. (Ericaceae) westernmost distribution limit

    Ribeiro, M.M.A.; Piotti, A.; Ricardo, A.; Gaspar, D.; Costa, R.; Parducci, L.; Vendramin, G.G.
    Mediterranean forests are fragile ecosystems vulnerable to recent global warming and reduction of precipitation, and a long-term negative effect is expected on vegetation with increasing drought and in areas burnt by fires. We investigated the spatial distribution of genetic variation of Arbutus unedo in the western Iberia Peninsula, using plastid markers with conservation and provenance regions design purposes. This species is currently undergoing an intense domestication process in the region, and, like other species, is increasingly under the threat from climate change, habitat fragmentation and wildfires. We sampled 451 trees from 15 natural populations from different ecological conditions spanning the...

  7. Application of FTIR-ATR spectroscopy on the bee pollen characterization

    Anjos, O.; Santos, A.J.A.; Dias, T.; Estevinho, L.M.
    Bee pollen contains almost all nutrients required by the human organism as well as diverse health-promoting substances. However, its composition and nutritional value greatly depend on the botanical origin. As such, it is importante to develop a rapid and non-expensive methodology that allows studying its characteristics, making labelling more objective and easier. The FTIR-ATR technique was used to predict some nutritional parameters in 126 bee pollen samples. FTIR-ATR spectrum obtained in the region between 4000 and 400 cm−1 with PLS Regression models were used to correlate spectral information with the data obtained using reference methods. In this first approach with...

  8. Integrated planning for landscape diversity enhancement, fire hazard mitigation and forest production regulation: a case study in central Portugal

    Navalho, I.; Alegria, C.M.M.; Quinta-Nova, L.C.; Fernandez, P.
    Forest fires and forest biodiversity are related issues of major concern in Mediterranean countries and require an integrated approach to landscape planning. The aim of this study was to develop a GIS approach for regulating forest production while promoting landscape diversity and mitigating fire hazard. A study area located in the centre of Portugal was chosen. The area was primarily occupied by maritime pine and had a high fire hazard, low tree species diversity and an extensive protection area. The classical area control method was used to assist in forest production regulation. Species suitability maps were produced for 21 recommended...

  9. O uso da água na agricultura em Portugal. Parte I - Evolução da agricultura de regadio : aspetos sociais e institucionais

    Duarte, A.C.
    Nas condições climáticas de Portugal, a agricultura de regadio tem uma importância indiscutível na estrutura da produção final agrária, já que permite fazer culturas com maior valor acrescentado que as tradicionais culturas de sequeiro. Pretende-se neste estudo fazer uma abordagem integrada da questão do uso da água na actividade agrícola, enquadrada nos constrangimentos e oportunidades de cariz social e institucional. No último meio século constatou-se um significativo aumento da eficiência no uso da água na agricultura, a que tem correspondido um elevado consumo de energia. Dos aproveitamentos hidroagrícolas estudados, constata-se uma grande diversidade de esquemas de tarifação da água de...

  10. Os repositórios das instituições de ensino superior portuguesas : estudo comparativo

    Rodrigues, M.E.P.; Amante, M.J.; Pais., C; Lopes, S.; Segurado, T.; Rodrigues, A.M.
    O Movimento de Acesso Aberto ao Conhecimento provocou alterações no modelo de difusão e publicação de conhecimento científico, sendo os repositórios institucionais de acesso aberto os sistemas de informação que, ao nível das instituições de ensino superior, melhor concretizam este objetivo. O presente estudo pretende contribuir para o conhecimento do modo de funcionamento dos repositórios das instituições de ensino superior portuguesas presentes no Portal RCAAPi. O estudo foi realizado mediante aplicação de um inquérito por questionário aos gestores dos repositórios. Verificou-se que os bibliotecários desempenham um papel preponderante na organização e funcionamento dos Repositórios Institucionais. A maioria possui política de...

  11. Ischnura graellsii (Insecta: Odonata) a water pollution biovulnerability indicator-probability mapping using spatial uncertainty

    Campos, F.; Velasco, T.; Sanz, G.; Casanueva, P.; Albuquerque, M.T.D.; Antunes, I.M.H.R.
    Ischnura graellsii (Insecta: Odonata) a water pollution biovulnerability indicator-probability mapping using spatial uncertainty.

  12. Genetic diversity and hybridization in the two species Inga ingoides and Inga edulis: potential applications for agroforestry in the Peruvian Amazon

    Rollo, Alexandr; Lojka, Bohdan; Honys, David; Mandák, Bohumil; Wong, Julio A. Chia; Santos, Carmen; Costa, Rita; Quintela-Sabarís, Celestino; Ribeiro, M.M.A.
    Key message: Slash and burn practices affect tropical forests. Our results showed strong introgression between Inga ingoides and Inga edulis in the species contact area Interspecific hybridization could be sought to improve yield or tolerance to flooding and further increase the economic potential of the poorly drained Amazonian soils and minimize deforestation. Context: Inga species are important components of tropical American forests, as well as a local food source. Little is known about the genetic structure of these species; in particular the amount of introgression among species remains unknown. Aims: We assessed the degree of genetic divergence and introgression among...

  13. Nutritional value of Opuntia ficus-indica cladodes from Portuguese ecotypes

    Rodrigues, A.M.; Pitacas, F.I.; Reis, C.M.G.; Blasco, M.
    The use of Opuntia ficus-indica cladodes as a forage for ruminants has been very important in the semi-arid and arid regions of the world. O. ficus-indica cladodes can be fed to small ruminants especially in periods of the year when there is low quality and quantity of pasture. In Mediterranean regions like South of Portugal during the rainy season the availability of pasture is quantitatively and qualitatively satisfactory, but in critical times of the year the shortage and low nutritive value of forages causes decreased productivity in the ruminant’s production of milk and meat. The aim of this study was to evaluate the nutritional profile...

  14. Sero-epidemiological study of canine leishmaniosis in the Cova da Beira Region

    Coelho, S.; Matos, A.C.; Cardoso, L.; Brancal, H.; Martins, M.V.
    Sero-epidemiological study of canine leishmaniosis in the Cova da Beira Region.

  15. Histopathological aspects observed in deer (Cervus elaphus) mesenteric lymph nodes

    Matos, A.C.; Coelho, A.C.; Figueira, L.; Matos, M.; Pires, M.A.; Pinto, M.L.

  16. Prevalence of gross changes in wild boar (Sus scrofa) and deer (Cervus elaphus) mesenteric lymph nodes

    Matos, A.C.; Coelho, A.C.; Figueira, L.; Matos, M.; Pires, M.A.; Pinto, M.L.

  17. Pulmonary lesions consistent with disseminated adiaspiromycosis in Egyptian mongooses (Herpestes ichneumon) from Portugal

    Matos, A.C.; Figueira, L.; Martins, M.H.; Matos, M.; Pires, M.A.; Coelho, A.C.; Pinto, M.L.
    Pulmonary lesions consistent with disseminated adiaspiromycosis in Egyptian mongooses (Herpestes ichneumon) from Portugal.

  18. Diffuse lymphadenitis and disseminated Mycobacterium avium subsp. paratuberculosis infection in two wild Eurasian otters (Lutra lutra L. 1758)

    Matos, A.C.; Figueira, L.; Martins, M.H.; Matos, M.; Pires, M.A.; Álvares, S.; Mendes, A.; Sousa, N.; Coelho, A.C.; Pinto, M.L.
    Diffuse lymphadenitis and disseminated Mycobacterium avium subsp. paratuberculosis infection in two wild Eurasian otters (Lutra lutra L. 1758).

  19. Granulomatous sesions and Mycobacterium avium subsp. paratuberculosis in Portuguese wild boars (Sus scrofa)

    Matos, A.C.; Figueira, L.; Martins, M.H.; Matos, M.; Andrade, S.; Álvares, S.; Mendes, A.; Sousa, N.; Coelho, A.C.; Pinto, M.L.
    ranulomatous sesions and Mycobacterium avium subsp. paratuberculosis in Portuguese wild boars (Sus scrofa).

  20. Granulomatous lymphadenitis caused by Nocardia species in hunted wild boar (Sus scrofa) in Portugal

    Matos, A.C.; Dias, A.P.; Morais, M.; Matos, M.; Pinto, M.L.; Coelho, A.C.; Figueira, L.

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.