burkea africana wood


Family: Fabaceae Lindl. Wildesering / Wild Syringa. Description. (CP) (Strain BAM Ebw 15) were used throughout this study. 6: t. 593–594 (1843). Specific components of biomass considered include plant organ type, vertical distance from … The results of the EN 84 and ENV 1250 test are comparable, while the results of the prCEN/TS 15119-1 testing are not in line with the other two methods. 0000044544 00000 n The capacity of extracts to inhibit the fungal growth was evaluated at different concentrations with propiconazole (a commercial fungicide for wood) as standard. They are very effective fungicides and insecticides, but they do not react with wood and thus leach from it in wet applications. Extracts, were analyzed by combined gas chromatography-mass spectrometry, (GS-MS) on a Fisons MD 800 at an ionizing potential of 70 e.V. Referencias [ editar ] Burkea africana Hook. sterilized blocks (4 replicates) wer, samples are classified from 0 to 4 according to the importance of the, extraction with different solvents to evaluate the influenc, form drive system to raise and lower the sample automatically and, determined by measuring the increase in volume of extracted and. 0000008222 00000 n Burkea africana and Erythrophleum africanum are characterized by seed coat-imposed dormancy that prevents water entry and gaseous exchange, which are essential for the germination process. Liste des variétés. 2007; ... For the other wood species, a clear extract was obtained after seven hours indicating that a maximum of colored extractives had been removed. 0000047221 00000 n Considerable portions of boron are leached from wood in the first leaching cycles, already. Aubréville A., Burkea africana, in: Flore Forestière Soudano- fatty alkyl chain but were more difficult to identify. 0000006331 00000 n Soil pH, site factors and CCA leaching as reported in similar studies, work in a synergistic manner to accelerate the failure of CCA treated wood poles, explaining the huge losses experienced in Kenya. Kiln Schedules: disks on a Perkin Elmer FTIR spectrometer Spectrum 2000. spectra were recorded on a Bruker AM 400 spectrometer. ARE THE PODS AND LEAVES OF PROSOPIS JULIFLORA GROWING IN BARINGO KENYA TOXIC TO LIVESTOCK? Seine Borke ist grau bis schwarz. Les résultats obtenus montrent que malgré les propriétés fongicides et termiticides de certains produits contenus dans les extraits, ces dernières ne permettent pas d’expliquer entièrement à elles seules les raisons de la durabilité. 1 H NMR spectra of etheral extract of Burkea africana. Gas Chromatography – Mass Spectrometry (GC-MS), Fourier- Transform Infrared Spectroscopy (FTIR), 1H NMR(Proton nuclear magnetic resonance) analysis of crude extracts, NIST(National Institute of Standards and Technology) library and literature information indicated that P.Juliflora pods contain upto 6.3% unsaturated fatty acids such as hexadecanoic acid, octadecanoic acid, palmitic acid, dehydroabietic acid, oxyhydroabietic acid, free sugars such as sucrose and glucose, mannose, galactomanans and traces of aromatic compounds. Hinweise auf gerichtete Migrationsvorgänge innerhalb der Fläche wurden nicht gefunden. However, in spite of their positive contribution for the for-, est products industry, wood preservation is coming under, increasing scrutiny due to its negative influence on the envi-, ronment justifying the development of new wood preservation, systems [5] or development of new plantations with naturally, Heartwood was ground to fine sawdust powder, passed through a, 115 mesh sieve and dried at 80 °C before extraction with different sol-, vents in a Soxhlet extractor. The indigenous wood types that we use: Peltophorum Africanum. Hints indicating any migration processes of the biocidal active substances within the surface were not found. 0000004606 00000 n 0000009043 00000 n Chemical composition of the bark extracts of Coula edulis was investigated to find potential antioxidant, anti-termite and antifungal compounds which can find useful applications in the fields of food, nutraceuticals, cosmetics or agro-chemical. Genus: Burkea Benth. 0000004370 00000 n ... Cette tendance est la conséquence de la distribution radiale des extractibles qui présentent une concentration maximale dans la zone duramen externe-zone de transition. This is a list of Southern African trees, shrubs, suffrutices, geoxyles and lianes, and is intended to cover Angola, Botswana, Lesotho, Malawi, Mozambique, Namibia, South Africa, Swaziland, Zambia and Zimbabwe.. Further studies are also necessary to identify the products. 593–594. The Mopane vegetation is signified by Spirostachys africana and the genus Commiphora, while the Lowveld is strongly suggested by eight species: Burkea africana, Ptaeroxylon obliquum, Strychnos sp., Spirostachys africana, Catha edulis, Ficus burkei, Englerophytum magalismontanum and Vepris lanceolata. L’analyse des matières extractibles contenues dans le Burkea africana est étudiée dans le but de mieux comprendre les raisons de la durabilité exceptionnelle de ce type de bois. The radical 2,2-diphenyl-1-picrylhydrazyle (DPPH) and the cationic radical 2,2'-azinobis(3-ethyl-benzothiazoline-6-sulfonic acid) (ABTS +) were used for evaluation of antioxidant properties of the different extracts. The results obtained show that in spite of the fungicidal and termiticidal properties of certain products contained in the extracts, these properties do not allow to explain entirely the reasons of the durability. Les meilleures activités antioxydantes ont été enregistrées avec les extraits polaires de l’écorce mais surtout avec celles du bois de coeur de C.edulis qui se rapprochent des valeurs des activités antioxydantes de la catéchine et du BHT, utilisés comme témoins positifs dans cette étude. Range. Wood specimens treated with1000ppm CCA or not treated and exposed to the fungus in a standard laboratory soil bed gave weight losses of 8% and 28% respectively. pl. Aucune différence significative de la composition chimique n'a été observée entre les différents rondins. Les sucres et surtout les composés phénoliques tels que l’acide gallique et l’acide ellagique ont été identifiés comme composés majoritaires des extraits polaires. Its wood is hard and heavy particularly useful for con- 0000001938 00000 n Le duramen est durable vis à vis des champignons et relativement résistant vis à vis des termites. Torn grain on planed surfaces is common. Saprophytic fungi are among the more important decomposer organisms particularly in acid soils so that any long term inhibition of fungal activity in such soils caused by repeated pesticide usage may be expected to interrupt the flow of energy through the soil ecosystem. Analysis of the products present in the diethylether extracts indicates the presence of fats, waxes and squalene which could be the reason of the preceding results. At species level, variability (quantified by the coefficient of variation) was rather high for density (27%), much lower for lignin and cellulose (14% and 10%) and much higher for ethanol/benzene extractives, hot water extractives and ash content (81%, 60% and 76%). In reality, only the heartwood of some species is durable, sapwood being in general easily degraded (Rowell et al. that the penta-bonded acrylate is a poly(ethylene co-dipentachlorophenyl diacrylate), which has a disubstituted pentachlorophenyl group linked through two acrylate ester bonds. Le caractère hydrophobe du bois ainsi que sa forte stabilité dimensionnelle seraient également des facteurs importants de sa résistance. Each leaf is 100350 mm long, with 24 pairs of pinnae and 518 leaflets per pinna. Les acides gras comme l’acide hexadécanoïque et l’acide trans-9-Octadecenoïque et les composés terpéniques tels que le stigmastérol et le β-Sitostérol ont été identifiés comme composés majoritaires des extraits peu polaires. This paper deals with the technological characterisation of Atlas cedar wood from artificial plantation in South Italy. Für die verkapselten Wirkstoffe ergaben sich dabei höhere Wirkstoff-Restgehalte in der Beschichtung über die Zeit als für frei eingesetzte Wirkstoffe. However, in spite, on the reasons of its natural durability and justify the studies, on the nature and on the influence of extractives on durability, tion methods involve the impregnation of broadly active bio-, cides into the wood to prevent fungal decay and insect attack, [4]. 0000003154 00000 n These results suggest that the durability of, tional durability. Les taux d’extractibles au niveau de l’écorce sont plus élevés que dans le duramen et l’aubier. After extraction, the solvent was evaporated under reduced pressure (or lyophilized in the case of water) and the crude extract was dried under vacuum in a desiccator over phosphorus pentachloride, P 2 O 5 , weighed and stored in the dark for further use. 0000012295 00000 n An advantage is that high loading of penta in polymer can be achieved. La deuxième partie de l'étude concerne la caractérisation chimique des extractibles et l'étude de leurs propriétés antioxydantes et antibactériennes. Access scientific knowledge from anywhere. Le (-)-mesquitol comme la (+)-catéchine sont capables d'inhiber l'oxydation du linoléate de méthyle induite par l'AIBN ainsi que d'inhiber le radical du DPPH. 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