Encontrados 17 documentos, a visualizar página 1 de 2
Bioassays against pinewood nematode: assessment of a suitable dilution agent an...
Barbosa, P.; Faria, J.M.S.; Mendes, M.D.; Dias, L.S.; Tinoco, M.T.; Barroso, J.G.; Pedro, L.G.; Figueiredo, A.C.; Mota, M.Acetone was investigated and found to be an appropriate alternative to Triton X-100 as a solvent of essential oils in bioassays aimed to investigate their effects on pinewood nematode (Bursaphelenchus xylophilus) mortality. Therefore it was used as dilution agent to screen the effectiveness of fifty two essential oils against this pest. Thirteen essential oils were highly effective, resulting in more than 90% p...
INFLUENCE OF CELL WALL CALCIUM CONTENT IN FRUIT FIRMNESS DURING THE RIPENING OF...
Rato, A.E.; Nunes, C.; Agulheiro-Santos, A.C.; Barroso, J.M.; Coimbra, M.A.; Riquelme, F.‘Rainha Claudia Verde’ is a regional cultivar of Prunus domestica L. well adapted to a specific region in the south of Portugal. In order to understand the postharvest behavior of this cultivar produced in different orchards, cell wall poly-saccharides and cell wall calcium fruit content were studied during ripening in two consecutive years. During harvest period pectic fractions soluble in water, carbonate and...
Nematicidal activity of essential oils and volatiles derived from Portuguese ar...
Barbosa, P.; Lima, A.S.; Vieira, P.; Dias, L.S.; Tinoco, M.T.; Barroso, J.G.; Pedro, L.G.; Figueiredo, A.C.; Mota, M.Twenty seven essential oils, isolated from plants representing 11 families of Portuguese flora, were screened for their nematicidal activity against the pinewood nematode (PWN), Bursaphelenchus xylophilus. The essential oils were isolated by hydrodistillation and the volatiles by distillation-extraction, and both were analysed by GC and GC-MS. High nematicidal activity was achieved with essential oils from Cham...
Volatiles from Coriandrum sativum: comparation of in vitro and ex vitro grown p...
Cardoso, Susana M.; Dias, I.; Sousa, Maria João; Figueiredo, A. Cristina; Barroso, J.G.; Pedro, Luís G.Coriandrum sativum (coriander) is commonly used, raw or cooked, in Portuguese Gastronomy. Coriander is also used in traditional medicine as a carminative and as a digestive aid. The fruits essential oil is used in food flavouring and in perfumery and is also responsible for the digestive and stimulant effect as well as for fungicide and bactericidal activity.
Antioxidant activity of six Portuguese thyme species essential oils
Dandlen, S. Anahi; Lima, A. Sofia; Mendes, Marta D.; Miguel, M. Graça; Faleiro, M. Leonor; Sousa, Maria João; Pedro, Luís G.; Barroso, J.G.The essential oils of Thymus caespititius, T. camphoratus, T. capitellatus, T. carnosus, T. pulegioides, T. zygis subsp. zygis and T. zygis subsp. sylvestris collected in diff erent regions of Portugal, including the Azores islands, were evaluated for preventing lipid peroxidation and scavenging free radicals, and hydroxyl and superoxide anions. T. zygis subsp. zygis oil possessed the best capacity for preventi...
Essential oils of flowers of Citrus sinensis and Citrus clementina cultivated i...
Miguel, Maria Graça; Dandlen, S.; Figueiredo, A. C.; Barroso, J. G.; Pedro, L. G.; Duarte, Amílcar; Faísca, J.The essential oils, isolated by hydrodistillation, from the flowers of different cultivars of Citrus sinensis (L.) Osbeck (Cs) and Citrus clementina Hort. Ex Tan. (Cc) collected at different harvesting times, were analyzed by GC and GC-MS. All the samples studied afforded yellowish oil which yields ranged from 0.05 to 0.08 % (v/w). The monoterpene fraction dominated both oils (66-91%), being the monoterpene hyd...
Evolução tecnica em Olivicultura
Barroso, J.; Dias, A.; Peça, J.O.; Pinheiro, A; Santos, L.É descrita a evolução dos sistemas de condução do olival em Portugal ao longo das ultimas décadas e uma síntese das actuais técnicas culturais .
Estudo das modificações físico-químicas ocorridas durante a confitagem da Ameix...
Nunes, C.; Silva, J. A. L.; Santos, C.; Rato, A. E.; Barroso, J. M.; Rocha, S. M.; Saraiva, J.; Coimbra, M. A.Neste trabalho estudaram-se as alterações da microestrutura, textura e polissacarídeos da parede celular durante a confitagem da Ameixa dlElvas. Foram utilizadas ameixas não processadas ("Rainha Claudia Verde"), cozidas e confitadas. As células do parênquima das ameixas cozidas e as das confitadas, quando comparadas com as do fruto não processado, apresentaram degradação da parede celular primária, aumento do e...
Levisticum officinale hairy root cultures: influence of light and light type on...
Lima, A. Sofia; Sousa, Maria João; Pedro, L.G.; Figueiredo, A. Cristina; Barroso, J.G.; Deans, S.G.; Scheffer, J.J.C.The essential oils of Levisticum officinale W.D.J. Koch (Apiaceae), including those isolated from the roots, are used in the cosmetic, pharmaceutical and food industries [1]. This perennial and herbaceous plant, commonly known as lovage, is widely known by its aromatic, ornamental and medicinal properties. The effect of light and light type on growth and essential oil production of lovage hairy root cultures wa...
Beam transport in a quadrupole electrostatic system
Barroso,J. J.; Terra,M. O.Electron beam transport through a quadrupole electrostatic system is investigated by particle-in-cell simulation in the present work, where - at the advantage of easier experimental implementation - the analogous parabolic electrostatic potential replaces the usual neutralizing ion background of bounded plasma systems. Looking at the maximum transported current and the dynamical behavior dependence on the elect...
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