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Salhi, L. ; Nait Rabah, O. ; Deyrat, C. ; Roos, C. |
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Numerical modeling of the screw pile behavior under tensile loading in cohesionless soil |
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2014 |
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XV Danube – European conference on geotechnical engineering |
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Paper n° 190 |
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1033-1038 |
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Brandl, H ; Adam, D |
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9-11 September - Vienna - Austria |
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EcoFoG @ carole.legrand @ |
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237 |
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Paradis, S.; Guibal, D.; Vernay, M.; Beauchêne, J.; Brancheriau, L.; Chalon, I.; Daigremont, C.; Détienne, P.; Fouquet, D.; Langbour, P.; Lotte, S.; Mejean, C.; Thévenon, M.F.,;Thibaut, A.; Gérard, J. |
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Title |
Technological characteristics of 245 tropical and temperate timbers species |
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2012 |
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2012 IUFRO Conference proceedings |
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Division 5 Forest products |
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191 |
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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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Lisbonne, Portugal |
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8-13 juillet 2012 |
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EcoFoG @ webmaster @ |
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155 |
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Djenontin, S.T.; Amusant, N.; Ducrot, P.H.; Sohounhloue, D.C.K.; Pioch, D. |
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Title |
First report on the termiticidal activity of extracts of Annona squamosa (Annonaceae) seeds and on its active constituent squamocins |
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Conference Article |
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2012 |
Publication |
2012 IUFRO Conference proceedings |
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Volume |
Division 5 Forest products |
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138-139 |
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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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Lisbonne, Portugal |
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8-13 juillet 2012 |
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EcoFoG @ webmaster @ |
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186 |
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Niamké, F.; Kokutse, A.D.; Kadio, A.A.; Lemenager, N.; Baudasse, C.; Nourissier-Mountou, S.; Adima, A.A.; Amusant, N.; Chaix G. |
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Title |
Nirs Tools for Prediction of Main Extractives Compounds of Teak (Tectona grandis L.) Heartwood |
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Conference Article |
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Year |
2012 |
Publication |
2012 IUFRO Conference proceedings |
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Division 5 Forest products |
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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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Lisbonne, Portugal |
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8-13 juillet 2012 |
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EcoFoG @ webmaster @ |
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196 |
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Sabatier, D.; Couteron, P.; Elfort, G.; Madelaine, C.; Molino, J.F.; Nicolini, E.A.; Prévost, M.F.; Pélissier, R.; Proisy, C.; Smock, L.; Tarcy, M.; Abner, E.; Baisie, M.; Bonal, D.; Domenach, A.M.; Freycon, V.; Godard, I.; Gond, V.; Goret, J.Y.; Kago, F.; Koese, M.; Kwasie, F. |
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Evaluation multi-échelles de la diversité spécifique, structurale et fonctionnelle des arbres en forêt guyanaise : prise en compte du substrat géologique, des types de sols et de la dynamique sylvigénétique (DIME) |
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2006 |
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Ecosystèmes tropicaux : actes du 2ème colloque de restituion du programme de recherche |
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125-133 |
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ECOFOR |
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Paris(France) |
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7-8 novembre 2006 |
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EcoFoG @ webmaster @ |
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141 |
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Zaremski, A.; Gastonguay, L.; Zaremski, C.; Chaffanel, F.; Beauchêne, J.; Le Floch, G. |
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Title |
Biodegradation of treated wood waste by native fungal communities of tropical soil in French Guiana |
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Conference Article |
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2012 |
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IRG/WP |
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12 |
Issue |
50285 |
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43 |
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fungal community; basidiomycetes; sequencing; DNA; ITS1 and ITS 4; D-HPLC; CE-SSCP; PCP; CCA |
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Woods have been protected with fungicides for a long time, and the effects of these fungicides on soil after being leached into the ground have turned out to be a true environmental issue. It is in this perspective that we are proposing to study fungal communities of these contaminated woods in a purpose of bioremediation. Most of precedent studies have focused on ability of some Basidiomycetes and white rot fungi to degrade these biocide products. Treated and reference (non-treated) woods samples have been incubated in containers of forest soil in Guyana. The first two samplings of these woods and soils have been realized five months apart. A crop and molecular study allowed us to isolate and identify forty strains of Ascomycetes able to develop on wood and resist xenobiotics. Until now, no Ascomycete was known to resist xenobiotics. Furthermore, a study of fungal communities of the woods and soil were done by D-HPLC and SSCP, and then analyzed by ACP. According to these analyses, biocides are leached in the soil and have an impact on these fungal communities, which are different depending on time of sampling and the way wood is processed. |
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Kuala Lumpur, Malaysia |
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6-10 mai 2012 |
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no |
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EcoFoG @ webmaster @ |
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156 |
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Amusant, N.; Beauchêne J.; Fournier, M. |
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Intraspecific variability of durability of Wapa courbaril (Eperua grandiflora) against Antrodia sp. and Coriolus versicolor: effect of radial and height position in the stem |
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Conference Article |
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2004 |
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IRG/WP |
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04 |
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10531 |
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Natural durability; Amazonian wood, variability; basidiomycetes |
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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. |
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Ljubljana, Slovenia |
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6 Octobre 2004 |
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EcoFoG @ webmaster @ |
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206 |
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Houel, E.; Bertani, S.; Bourdy, G.; Deharo, E.; Jullian, V.; Valentin, A.; Chevalley, S.; Stien, D. |
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Quassinoid constituents of Quassia amara L. (Simaroubaceae) leaf herbal tea. Impact on its antimalarial activity and cytotoxicity |
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2010 |
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Planta Medica |
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Planta Med. |
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76 |
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12 |
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1381-1382 |
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French Guiana records high malaria incidence rates. The traditional antimalarial remedy most widespread and still very much in use there is a tea made out from Quassia amara mature leaves. The antimalarial activity of this preparation was assessed [1] and in order to optimize the in vitro activity, different types of preparation have been realized and tested. The most active in vitro preparation is an infusion of fresh young leaves. It demonstrated a very good activity, in vitro as well as in vivo [2]. A known quassinoid, simalikalactone D (SkD), was identified as the active compound, with an IC50 value of 10 nM against FcB1 Plasmodium falciparum chloroquine resistant strain in vitro [3]. Our next objective was to assess whether it could be contemplated to recommend this young leaves tea for treatment against malaria, since it seemed from literature precedent that SkD was also cytotoxic to a number of cellular lineages [4,5]. We then characterized and quantified the antiparasitic and cytotoxic activities of all the constituents. Several quassinoids were isolated and characterized in the tea: SkD, quassin, neoquassin, and picrasins B, H, I (new) and J (new), SkD being responsible of both antiplasmodial activity and cytotoxicity. In addition, in the context of an antimalarial treatment, it appeared that the dose necessary for obtaining a curative antimalarial effect is close to the toxic dose of an SkD analogue, bruceantin. Prior to emitting a definitive conclusion, a clinical study in humans similar to the one done with bruceantin [6] should be performed. |
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58th International Congress and Annual Meeting of the Society for Medicinal Plant and Natural Product Research, Berlin, Germany, 29th August - 2nd September 2010 |
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EcoFoG @ webmaster @ |
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175 |
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Le Ven, J.; Eparvier, V.; Litaudon, M.; Gueritte, F. |
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Isolation of bioactive aporphinoid alkaloids in Oxandra asbecki (Annonaceae) |
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2010 |
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Planta Medica |
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Planta Med. |
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76 |
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12 |
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1287 |
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Since prehistoric times, humans beneficially used natural resources for their daylife needs. Plants are able to synthesize complex molecules and consequently have a unique chemical diversity. This is a source of inspiration for new drugs discovery. Dyrk1A kinase is a target used in research on Alzheimer's disease. Inhibition of this kinase is associated with treating symptoms of this disease [1,2]. In France, the annual number of new cases is 230 000. The prevalence is expected to double in industrialized countries and quadruple in developing countries in the coming decades. The development of a better diagnosis and treatment is essential. The Annonaceae is a large family of tropical plants that have been investigated intensively. There exist 38 species in Oxandra genus and Oxandra asbecki species in Venezuela and in primary forests of French Guiana. To the aim of discovering new bioactive plants from French Guiana, Oxandra asbecki was selected for phytochemical study because of its potent inhibition of DyrK1A kinase. Bioassay-directed fractionation of the ethyl acetate extract provided three bioactive alkaloids. We isolated three aporphinoid alkaloids and show for the first time an strong activity (with micromolar IC50) of Velutamin under two kinase: CDK1 and DyrK1A, and activity of Aristolactam AII on DyrK1A kinase. |
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58th International Congress and Annual Meeting of the Society for Medicinal Plant and Natural Product Research, Berlin, Germany, 29th August - 2nd September 2010 |
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EcoFoG @ webmaster @ |
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177 |
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Odonne, G.; Stien, D.; Bourdy, G. |
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Two piptocarphols from Pseudoelephantopus spicatus (Asteraceae) may explain its traditional use against cutaneous leishmaniasis amongst the Chayahuita (Peruvian Amerindians) |
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2010 |
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Planta Medica |
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Planta Med. |
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76 |
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12 |
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1381 |
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Chayahuita Amerindians are dwelling in north-west Peruvian Amazon. As they live in an endemic area of cutaneous and muco-cutaneous leishmaniasis, they developed a rich pharmacopoeia against those well recognized diseases [1]. Pseudoelephantopus spicatus (B. Juss. ex Aubl.) Rohr ex Gleason (Asteraceae) is one of the most used Chayahuita remedies against cutaneous leishmaniasis. In the course of evaluating those remedies against in vitro axenic amastigotes of Leishmania amazonensis, P. spicatus extract was found to be very active. Bioguided fractionation led to 3 active compounds (8,13-O-diacetyl-piptocarphol (1), 8-O-acetyl-13-O-ethyl-piptocarphol (2) and ursolic acid. Although these compounds had already been identified in other plants of the Vernoniae tribe (P. spicatus tribe) [2,3], none of them had been isolated from this species. 1 and 2 were found to be more active than amphotericin B against the parasite (IC50 for 1: 0.08±0.04µg/mL, 2: 0.14±0.05mg/mL, and 0.38µg/mL for amphotericin B), explaining at least partially the use of P. spicatus based remedies. |
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58th International Congress and Annual Meeting of the Society for Medicinal Plant and Natural Product Research, Berlin, Germany, 29th August - 2nd September 2010 |
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EcoFoG @ webmaster @ |
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179 |
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