Browsing by Author "Machado, Helena"
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- Knowledge of the potential of limonene as agent to preserve the pinus pinaster woodPublication . Francês, Samira; Anjos, O.; Pestana, Miguel; Machado, HelenaPinus pinaster wood is very susceptible to fungal degradation and that could be a great problem for its commercialization. In this work it was tested the capacity of limonene to prevent fungal development of two degradative fungi, Trametes versicolor e Trichoderma citroviride, on Punus pinaster wood.
- Pine oil potential as agent to preserve the Pinus pinaster woodPublication . Anjos, O.; Gariso, Lúcia; Machado, Helena; Pestana, MiguelPine oil can be obtained from α-pinene and this is one of the constituents from gun-turpentine. Is a natural product and os known for its insecticide, bactericide and fungicide proprieties. In this study dry pinewood samples, cut in radial section, were impregnated with pine oil and stabilised at room temperature. Two degradative fungi were tested: Trametes versicolor and Trichoderma citrinoviride. Sterilized polypropylene vessels filled with glass beads and distilled water were prepared. Wood samples, deposed over the glass beads surface, were inoculated with fungal plugs collected from actively growing colonies and maintained at 25ºC in the dark during 29 days. The fungi development was assessed with image analysis system using a digital camera. Analysis of variance (ANOVA) was use to study the effect of impregnation treatments, sterilization and fungal treatments.
- Preliminary study of alternative agents to preserve Pinus pinaster woodPublication . Anjos, O.; Diaz, René; Gariso, Lúcia; Machado, Helena; Pestana, MiguelPine oil can be obtained from α-pinene and is one of the constituents from gun-turpentine. Is a natural product and is known for its insecticide, bactericide and fungicide proprieties. In this study dry pinewood samples cut in radial section, were impregnated with pine oil and limonene stabilised at room temperature.
- A produção e aplicação de óleo de pinhoPublication . Pestana, Miguel; Machado, Helena; Anjos, O.Com este texto pretende-se efetuar uma revisão sobre a produção e utilização de pinho. São referidos os dois tipos de óleo de pinho - sintético e natural- realçando-se as reações químicas e a sua produção, assim como, a composição e as propriedades do produto. Faz-se ainda uma referência às principais utilizações deste produto - limpeza e desinfetante, aplicação na indústria têxtil e na flotação de minérios. Por último faz-se referência ao óleo de pinho obtido das folhas das coníferas.
- Testing procedures for selection of new pinewood preservation productsPublication . Nevado, Belén; Diaz, René; Santos, José; Anjos, O.; Pestana, Miguel; Machado, HelenaIn this work we compare the results of three experimental series of tests used as a first approach on selection of natural products for wood preservation.