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Lamarre, G. P. A., & Baraloto, C. (2012). Plantes et insectes herbivores: une bataille évolutive à l’armement. Une Saison en Guyane, 8, 84–89.
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Paradis, S., Guibal, D., Vernay, M., Beauchêne, J., Brancheriau, L., Chalon, I., et al. (2012). Technological characteristics of 245 tropical and temperate timbers species. In 2012 IUFRO Conference proceedings (Vol. Division 5 Forest products, 191). Lisbonne, Portugal.
Abstract: Developed by the Cirad's “Mediterranean and Tropical Forest Products Research Unit”, the new release of TR OPIX software (version 7) presents the main characteristics of 245 tropical or temperate wood species. For each species, TROPIX provides data and information on: the scientific and local names of the species described, their origins (distribution maps) and any commercial restriction according to the CITES regulation; appearance of the log or wood, including pictures of wood and wood utilisations; leading physical and mechanical properties; natural durability against fungi/dry wood borers/termites, and preservation; drying behaviour, including a drying schedule given for information; processing behaviour (sawing, machining, assembling); appearance grading and visual grading for structural applications; actual and potential uses and reaction to fire. Some of this information is displayed in graphical format. TR OPIX 7 allows multicriteria search using preselected search terms or similarity to a different species. It also allows graphical species comparisons based on one or two physical or mechanical properties. Multicriteria searches results, graphics and technical sheets can be printed or exported as files.
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Plomion, C., Scotti, I., Delzon, S., & Gion, J. - M. (2011). Adaptation of forest trees to climate change. In BMC Proceedings: IUFRO Tree Biotechnology Conference 2011: From Genomes to Integration and Delivery (Vol. 5, I13).
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Djenontin, S. T., Amusant, N., Ducrot, P. H., Sohounhloue, D. C. K., & Pioch, D. (2012). First report on the termiticidal activity of extracts of Annona squamosa (Annonaceae) seeds and on its active constituent squamocins. In 2012 IUFRO Conference proceedings (Vol. Division 5 Forest products, pp. 138–139). Lisbonne, Portugal.
Abstract: Termites inflict severe damage on wood and impede usage of several forest species. The biological metabolites could potentially replace synthetic termiticidal products which are becoming more restricted to use. Annona squamosa is well known for its edible fruits – tropical custard apple. Annonaceous tetrahydrofuran acetogenins have attracted much interest due to their broad range of biological activities, and seeds containing them are reported to show insecticidal and abortifacient properties.
Under the course our exploratory investigation of non food valuable products from less known forest species (here from Benin), the fractions obtained from defatted cake of Annona squamosa seeds with solvents covering a broad range of polarity, revealed a significant termiticidal activity, when applied at 5 – 10 mg/cm² (non-polar solvent) and 1.2 – 5 mg/cm² (case of a more polar solvent).
Based on the result (0: no attack) from the standard procedure EN 118, these extracts could be used for preserving wood under class of use number 1. A derivatization step with Kedde reagents A and B, elemental analysis C,H,O, HPLC/MS and proton NMR showed the presence of squamocin type acetogenins (MW 594 and 622 g/mole: C35H62O7 and C37H66O7) as main components of the most active fraction (100% mortality within 7 days for a sample applied at 2 mg/cm²).
Additional work will be undertaken to confirm the structure of most active compounds in the extracts, and to check whether some Annona squamosa seed extracts (non timber products of sustainable management of native forest) could show even higher activity to protect wood under more adverse conditions and be alternative active natural products to synthetic compounds.
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Niamké, F., Kokutse, A. D., Kadio, A. A., Lemenager, N., Baudasse, C., Nourissier-Mountou, S., et al. (2012). Nirs Tools for Prediction of Main Extractives Compounds of Teak (Tectona grandis L.) Heartwood. In 2012 IUFRO Conference proceedings (Vol. Division 5 Forest products). Lisbonne, Portugal.
Abstract: Biochemical and physiological process which occurred during heartwood formation have consequences on wood properties such as colour, natural durability and some mechanical properties. However, it is very time-consuming to take measurements of extractives contents. Teak has been reported to contain 1-hydroxy-2-methyl-anthraquinone, 2-hydroxy-methyl-anthraquinone, 2-methyl-anthraquinone, lapachol, 1,4-naphthoquinone for the main compounds.
In teak, natural durability is ascribed to extractives. Consequently, it’s possible to estimate natural durability by measurement of extractives indirectly. For the purposes of selection for the production of improved varieties, the number of samples to be measured rapidly exceeds the capacity of a traditional laboratory.
Near-infrared spectroscopy approach, based on spectral data and reference data, is a tool enabling many of the chemical properties of wood to be predicted and the number of laboratory measurements to be reduced exponentially. The issue here is a question of checking the effectiveness of NIRS tool to build models and predict the main extractive compounds of teak wood from Ivory Coast. We try to calibrate these chemical properties with Nirs spectral information measured on grounded wood.
The results show the possible use of NIRS to predict total phenol content and some main extractive compounds of teak heartwood as tectoquinone, 2-hydroxymethylanthraquinone, … Consequently, after verification on other sets of teak samples, which may or may not be included in the prediction model, NIRS can be used to predict extractive compounds accurately for a large number of samples, making it possible to estimate natural durability indirectly and to include these characteristics in the selection criteria for classifying wood and high throughput phenotyping.
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Kanguem, J. N., Robert, F., & Roos, C. (2011). Biocorrosion of stainless steel 254 SMO by Amazonians microorganisms. In European Corrosion Congress 2011, EUROCORR 2011 (Vol. 4, 3373). Stockholm.
Abstract: Corrosion induced by the microorganisms is a phenomenon still poorly known and difficult to interpret. In this work we are interested in marine corrosion of stainless steel 254 SMO by Amazonians biofilms. The objective is to achieve an experimental laboratory to reproduce the corrosion completely controlled environment. The microbiologically influenced corrosion (MIC) of stainless steel by marine bacteria was investigated using surface analysis (scanning electron microscopy (SEM)), and electrochemical techniques (the open circuit potential, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization curves). The epifluorescence microscopy has been used to correlate the experiments. We investigated the role of some chemical parameters and the influence of the tide.
Keywords: Bio corrosion; Bio film; Electrochemical techniques; Stainless steel
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Amusant, N., Beauchêne J., & Fournier, M. (2004). Intraspecific variability of durability of Wapa courbaril (Eperua grandiflora) against Antrodia sp. and Coriolus versicolor: effect of radial and height position in the stem. In IRG/WP (Vol. 04). Ljubljana, Slovenia.
Abstract: The variation of a lesser-used species, Eperua grandiflora attacked by brown and white rot has been examined. Trees of this specie showed differences in their behaviour against the type of rot used and also showed evidence of intra and inter tree variation. The “tree” effect is very significant concerning natural resistance. In the same way, there is variation of durability observed according to radial and vertical position in the stem. Although the vertical effect is less significant from practises point of view.
Keywords: Natural durability; Amazonian wood, variability; basidiomycetes
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Garcin, N., Humbert, L., Martin, N., & Amusant, N. (2014). Anib@rosa, un projet éco responsable pour le bois de rose en Guyane. Les cahiers de l'école QUAres, 3.
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Tabarant, P. (2007). Stratégies de croissance en hauteur des jeunes arbres héliophiles en couvert dense tropical – Ajustement du fonctionnement hydraulique et mécanique (Vol. Master 2 recherche sciences de l'univers, environn). Master's thesis, Université Pierre et Marie Curie, Paris - France.
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Allard, L. (2009). Organisation de la diversité génétique dans le complexe d'espèces du genre Carapa (Vol. Master 2 Recherche : fonctionnement et modélisati). Master's thesis, Université de Bordeaux 1, Bordeaux.
Keywords: Foret Tropicale Humide; Carapa Procera; Carapa Guianensis; Complexe D'Especes; Diversity; Genetique; Microsatellite; Assignation Genetique; Hybridation
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