ALUMNA DE LA ESCUELA TALLER [Material gráfico]

Copia digital. Madrid : Ministerio de Educación, Cultura y Deporte. Subdirección General de Coordinación Bibliotecaria, 201

Characterization of bark extractives of different industrial Indonesian wood species for potential valorization

Barks are available as waste material and by-product of wood industry. They have been reported to contain interesting molecules and show some bioactivity such as antioxidant and antifungal. This study aimed at evaluating the amounts of extractives in Acacia mangium (acacia), Paraserianthes falcataria (sengon) and Swietenia mahagoni (mahoni) barks, to evaluate their extractive contents and the presence of potential valuable molecules. The extraction method used soxhlet with four different solvents. Antioxidant activity assays were carried out using methyl linoleate and 2,2-diphenyl-1-picrilhidrazyl (DPPH) and the antifungal activity was determinate by fungal growth inhibitions assays. 5.3%–18.5% extraction yields were obtained. All acetone and toluene ethanol extracts show high antioxidant activity by DPPH. The highest antioxidant value obtained by DPPH was obtained for mahoni bark acetone extract with 3.9 mg/L of EC50, followed by mahoni bark toluene ethanol 6.8 mg/L, acacia bark acetone 7 mg/L, and acacia bark toluene ethanol extract 7.4 mg/L. Sengon bark extracts had the greatest antifungal activity inhibition. The greatest antioxidant and antifungal activity were obtained with phenolic compounds which were contained in the extracts

Comparison of teak wood properties according to forest management: short versus long rotation

Key message: Teak (Tectona grandis L.f.) is one of the most important tropical hardwood tree species, which is widely planted in Indonesia. Wood properties are strongly influenced by forest management conditioning further utilization of wood. Context: In Indonesia, teak wood has been supplied from the state forests (Perhutani) for long rotation teak and from community teak plantations for short rotation teak. Short rotation teak has been harvested at 7–10 years and long rotation teak at 40–60 years. Aims: This paper discusses the characterization of technical properties of short and long rotation teak wood based on the chemical, anatomical, physical, and mechanical properties. Methods: The properties of short rotation and long rotation teak woods were characterized by measuring their density, extractive contents, chemical composition, swelling, wettability, water sorption isotherm, decay resistance, anatomical properties, bending strength (modulus of rupture (MOR), modulus of elasticity (MOE)), and hardness. Results: The results indicate that short rotation teak was not particularly different in swelling, MOE and MOR, and Brinell hardness compared to long rotation teak, although it was less dense and less durable due to lower heartwood and extractive contents. Therefore, careful attention should be given to the use of short rotation teak in some wood-processing technologies. Conclusion: Lower wood density and durability of the short rotation compared to the long rotation teak will restrict its utilization to some extent for both indoor and outdoor applications. Fast-growing teak from community cannot be used as usual heartwood teak from Perhutani because of the very low proportion of useful heartwood in the stem

Activités économiques et processus de développement : quelle place pour l'éthique ?

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OMD, ODD, quels indicateurs pour le développement ?

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Droits et développement

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Varia. Institutions. coopération. ouverture. inégalités

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Pour promouvoir le developpement durable, l'integration regionale constitue–t–elle un rempart contre les exces de la mondialisation ?

National audienceLa mondialisation et le développement durable font l’objet de débats ardents. De manière inédite en France, cet ouvrage fait le point sur l’étude des relations entre les processus de mondialisation et les discours et pratiques du développement durable, avec une attention toute particulière accordée aux pays en développement.La mondialisation et le développement durable imposent-ils une analyse renouvelée, voire une remise en cause, des théories du développement ? Les régulations pour un développement durable dans les économies en développement sont-elles des symptômes d’une mondialisation arrangée servant une économie libérale, ou sont-elles à l’origine de l’expression de « nouvelles » formes de développement qui s’insèrent dans les interstices de la mondialisation ?Les auteurs de cet ouvrage dressent un tableau, nuancé et multidisciplinaire, de l’étude des complémentarités et/ou des contradictions entre la mondialisation, le développement et l’environnement, et analysent de manière critique des stratégies et pratiques de développement durable ainsi que les modalités de gouvernance dans les économies en développement en général et à Madagascar en particulier

L'activité économique comme création collective dans l'optique peroussienne : actualités et perspectives

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