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Rodrigues, A., Royer, M., Amusant, N., Beauchêne, J., Herbette, G., Eparvier, V., et al. (2009). Antinomic natural self protection mechanism in long lasting woods : a case study with three tropical species from French Guiana. In IRG/WP (Vol. 09). Beijing, China.
Abstract: We demonstrate in this work through 3 examples that Amazonian trees may specialize long-lasting woods by means of at least to different approaches. Wallaba impregnates its wood with large amounts of weakly antifungal compounds acting in synergy, while tatajuba and louro vermelho woods are naturally impregnated with antifungal agents. Comparison of biological activities in vitro and concentrations in the woods indicate that these compounds alone may account for the natural durability of the two woods.
Keywords: wood; natural durability; wood degradation; antifungal extractives
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Rodrigues, A., Theodoro, P., Basset, C., Espindola, L., & Stien, D. (2010). Bio-inspiration in the discovery of active natural products: an example with the search of antifungal agents inspired from long-lasting woods. In Planta Medica (Vol. 76, 1293).
Abstract: Plant natural products have been perfected through evolution with respect to their specific biological roles (defense, elicitor, and so on) and are, therefore, an excellent starting point in the search for new biologically active chemicals. Hence, despite the progressive abandonment of the exploration of naturally sourced bioactive substances by the pharmaceutical industry, more than half of the drugs approved in the United States between 2005 and 2007 are natural products or natural product-derived drugs, five of which constituted the first members of new drug classes [1]. Clearly, chemical research into natural substances still has an important role to play in improving quality of life, and can play an important role by inventing innovative strategies to discover new bioactive compounds [1,2].
In the present work, we demonstrated that a bio-inspired approach for the identification of novel bioactive natural products represents a promising biotechnological tool for the development of new drugs. We have studied how natural defenses within decay-resistant wood can generate a large number of positive hits in the search for antimycotic agents. In addition, it was found from bioguided fractionation that ethyl acetate extracts of Sextonia rubra wood contain a relatively large proportion of antifungal metabolites rubrenolide (1) and rubrynolide (2), 1 being slightly more active than 2. The therapeutic potential of the above compounds will be discussed through the evaluation of their antifungal activities against 16 pathogenic fungi strains and their cytotoxicities towards KB cells.
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Roelens, J. B. (2005). Structure et dynamique spatiale d'Eperua falcata Aublet en forêt tropicale humide. Master's thesis, Université des Antilles et de la Guyane, .
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Roisin, Y., Corbara, B., Delsinne, T., Orivel, J., & Leponce, M. (2011). Termites in Santo: lessons from a Survey in the Penaoru area. In P. Bouchet, H. Le Guyader, & O. Pascal (Eds.), The natural history of Santo (pp. 128–130). Publications Scientifiques du Museum, IRD éditions, Pro-Natura International.
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Rolland, G. (2006). Stockage de carbone dans la biomasse aérienne en forêt tropicale humide guyanaise. Master's thesis, Université Henry Poincaré, Nancy.
Keywords: Bilan De Carbone Foret Tropicale Humide Guyane Francaise Biomasse Aerienne Variabilite Spatiale Sylvigenese
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Roy, M., Schimann, H., & Buée, M. (2015). Relations intimes entre plantes et champignons du sol. In P. - M. Forget, M. Hossaërt-McKey, & O. Poncy (Eds.), Ecologie tropicale: de l’ombre à la lumière. Paris: Editions du Cherche Midi-CNRS.
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Royer, M., Herbette, G., Eparvier, V., Beauchêne, J., Thibaut, B., & Stien, D. (2010). Secondary metabolites of Bagassa guianensis Aubl. wood, a contribution to the understanding of the natural durability and to the chemotaxonomy of the Moraceae family with an unexplored genus. In Planta Medica (Vol. 76, 1375).
Abstract: In effort to explain wood durability of Moraceae plants family, a phytochemical study was undertaken on Bagassa guianensis. The phytochemical investigation of the ethyl acetate extract obtained from the heartwood led to the isolation of 18 secondary metabolites, including 6 moracins [the new 6-O-methyl-moracin M (3), 6-O-methyl -moracin N (4) and moracin Z (5); the known moracin M (1), moracin N (2) and moracin P (6)], 8 phenolic derivatives [the new (-)-epialboctalol (12), arachidin 4 (10) and the known alboctalol (11), trans-resveratrol (7), arachidin 2 (9), trans-oxyresveratrol (8) and artogomezianol (13)], the 3 known flavonoids steppogenin (14), katuranin (15), dihydromorin (16), the β-sitosterol (17) and the resorcinol (18). Comparison with literature data indicates that stilbenoids are presumably responsible for the natural resistance of the wood against fungi degradation. In addition, chemical composition points out that B. guianensis is closely related to Morus sp. in the phylogeny and should be placed within the Moreae s. s. tribe in the Moraceae family, accordingly to the latest Weiblen genoma-based classifications [1,2].
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Ruelle, J. (2006). Analyse de la diversité du bois de tension de 3 espèces d'angiospermes de forêt tropicale humide de Guyane française. Ph.D. thesis, Université des Antilles et de la Guyane, Kourou.
Keywords: Anatomie; Microstructure; Mesure Des Proprietes; Physique Et Mecanique; Materiel Vegetal; Bois De Reaction; Activite Cambiale; Contrainte De Croissance
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Ruelle, J., Clair, B., Rowe, N., & Yamamoto, H. (2009). Occurrence of the gelatinous cell wall layer in tension wood of angiosperms. In B. Thibaut (Ed.), Proceedings of the Sixth Plant Biomechanics Conference (pp. 301–307). Cayenne, French Guyana: UMR EcoFoG.
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Ruelle, J., Yamamoto, H., Thibaut, B., & Beauchêne, J. (2006). Growth stresses and structural parameters in tension and opposite wood in three tropical rainforest angiosperm species. In L. Salmén (Ed.), Proceedings of the fifth plant biomechanics conference (Vol. 2, pp. 521–526). Stockholm (Sweden): STFI-Packforsk AB.
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