Synthesis of ethylene maleic anhydride copolymer containing fungicides and evaluation of their effec... Wirkstoff-Restgehalte verkapselter und freier Biozide in hydrophoben Fassadenbeschichtungen. Burkea africana fue descrita por William Jackson Hooker y publicado en Hooker's Icones Plantarum pl. 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. 0000014088 00000 n Burkea africana, the wild syringa (Bambara: siri), is a deciduous, medium-sized, spreading, flat-topped tree belonging to the family Caesalpiniaceae. The reaction of ethylene maleic anhydride copolymer with 8-hydroxy quinoline leads to products containing 44.8% poly(ethylene co-8-hydroxy quinolinyl acrylate) and 55.2% of unreacted poly(ethylene co-maleic anhydride). E and FN Spon, London, 2000, pp. 0000044391 00000 n H�lU�r�6��)�dL?I�&�qꦱ=s�49P�UH����k��wȣ�Q�Y�h+��% |����BWE4� ��D8~hm�H S������.��p�:��Y 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. This article reviews current systems and technologies in use or in development and suggests potential avenues for future efforts in the field of wood preservation. Considerable portions of boron are leached from wood in the first leaching cycles, already. The ethnopharmacology, chemistry and pharmacology of four Malian medicinal plants, Biophytum umbraculum, Burkea africana, Lannea velutina and Terminalia macroptera are reviewed. NAME: Burkea africana FAMILY: Caesalpiniaceae COMMON NAMES: Burkea,wild seriga LOCAL NAMES: Apasa, orusi, Fula-Fulfulde USEFUL PART(s): Bark, twigs GENERAL USES: The wood of the plant is used for heavy construction, flooring, furniture, railway sleepers, p The strongly hydrop, be also significant factors of its resist. Variability in the chemical composition of 614 species is described in a database containing measurements of wood polymers (cellulose, lignin and pentosan), as well as overall extraneous components (ethanol-benzene, or hot water extracts and ash, with a focus on silica content). Further studies are also necessary to identify the products. The durability of the biocidal compounds Terbutryne (2-Methylthio-4-tert-butylamino-1,3,5-triazin), Diuron (DCMU, 3-(3,4-dichlorophenyl)-1,1-dimethylurea), IPBC (3-Iodoprop-2-ynyl-N-butylcarbamate), OIT (2-n-Octyl-isothiazolin-3-one) and DCOIT (4, 5-Di-chloro-2-n-octyl-isothiazolin-3-one) in a hydrophobic façade coating was examined in a several year weathering experiment. FTIR spectra of Burkea africana extracts : (a) diethylether extract, (b) acetone extract, (c) toluene/ethanol extract. This Project aims at promoting the advanced formation in lignocellulosic biomass processing to biofuel production through the cooperation between researchers (professors and students) from graduate, Boron biocides belong to the most frequently used ingredients of commercial wood preservatives. It is suggested that two different wicking phenomena occur. Huilboom / The Weeping Wattle. Les extractibles du duramen obtenus avec différents solvants présentent des propriétés antioxydantes plus élevées comparativement à celles des extractibles contenus dans l'écorce ou l'aubier suggérant que les propriétés antioxydantes de ces derniers soient à l'origine des propriétés fongistatiques. 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. 0000001771 00000 n Contents of encapsulated and non-encapsulated biocides in hydrophobic façade coatings. 0000004370 00000 n Studies were carried out to understand the contribution of fungi to premature failure of Copper Chrome Arsenate (CCA) treated Eucalyptus grandis poles used in Kenya for structural purposes. This may also reduce any contamination of the probe liquids by extractives. For density, lignin, pentosan and cellulose, the distribution of values was nearly symmetrical, with mean values of 720 kg/m3 for density, 29.1% for lignin, 15.8% for pentosan, and 42.4% for cellulose. 23–36. 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. The total bark extractives contents obtained with Soxlhet (21%) are higher than those obtained with Dionex (17.8%). Referencias [ editar ] 0000006049 00000 n 0000001087 00000 n The natural durability of the hazel tree of Gabon Coula edulis versus basidiomycete fungi was evaluated with native and extracted samples of heartwood against brown rot (Rhodonia placenta and Coniophora puteana) and white rot (Trametes versicolor and Pycnoporus sanguineus) fungi. Dombeya Rotundifolia . Unextracted and extracted wood blocks were exposed to fungal attack, with beech as a reference wood. Analysis of the extracts contained in Burkea africana heartwood is studied with the aim of better understanding the reasons of the exceptional durability of this type of wood. Extracts from the leaves of P. juliflora contain upto 8.5% alkaloids such as tryptamine, piperidine,phenethylamine and juliprosopine described in literature as having antifungal and plant growth inhibiting properties as well as capable of inducing neuronal damages in animals. 0000014109 00000 n 0000011341 00000 n Distribution: Widely distributed in dry savanna forests from Nigeria southward to to Transvaal. A high value for any extraneous component, even in only one tree, is sufficient to classify the species in respect of that component. Le bois de P. Juliflora est dimensionnellement stable et présente des caractéristiques calorifiques, anatomiques et mécaniques normales , mais un taux de cendre élevé. tirely the reasons of the durability. The most obvious contamination occurred in the case of measurements on non-extracted veneers immersed in water and formamide. The tree is commonly known for its toxic milky latex that exudes from all parts of it. 0000008222 00000 n Africa (An appendix to the Flora of West Tropical Africa), Crown emulsion of oxidized polyethylene (WE6) wax were combined with boric acid (cB = 0.1 % or 0.5 % of boron). Gas chromatography-mass spectrometry (GC-MS) analysis revealed compounds in dichloromethane extract different from those obtained with all the other solvents. The wood is quite dense, taking into account the fast-grown characteristics of the stand, but the volumetric shrinkage is limited and the ratio between tangential and radial shrinkages is less than 1.5. Extracts obtained with acetone and toluene/ethanol mixture (2/1, v/v) indicated the presence of few amounts of fatty acids and sugars, catechin in small amount and huge amounts of phenolic acids like gallic and ellagic acids. Family: Fabaceae, or Leguminosae. 0000009893 00000 n �����reۻjg=�H����9C(��${���y������-Wn����l �T�dβ���>}BH��W��o�8JhK(7��ʺ�A�S��J. Shrinkage Values (Green to 12% MC) Radial - 1.2% Tangential - 2.1%: Drying Defects: Air seasons moderately fast with only a slight tendency to split or distort. This cooperation comprehends experimental studies of chemical, energetic and mechanical properties of lignocellulosic biomass, at laboratory and semi-pilot scales, and environmental life cycle assessment of technological processes to produce torrefied biomass. pl. The Tree: The tree grows to a height of 50-70 ft (15.2-21.3m), with a diameter of 12-24 in. Kapirikamfumu Luangwa Valley; Jun 2007. Photo: Mike Bingham. 58. 16 weeks. 244–246. ... Others researchers have shown that the natural durability of wood is due to the amount and chemical composition of extractives substances (Haupt et al., 2003;Nascimento et al., 2013;Jebrane et al., 2014). Burkea africana wächst als laubabwerfender, mittelgroßer Baum und erreicht Wuchshöhen von meist 8 bis zu 12, seltener bis zu 20 Meter. 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. Les résultats sur la caractérisation et les différentes analyses des extractibles ont montré que la teneur en extractibles varie avec la partie de l’essence étudiée, le solvant et la méthode d’extraction utilisée. 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. ARE THE PODS AND LEAVES OF PROSOPIS JULIFLORA GROWING IN BARINGO KENYA TOXIC TO LIVESTOCK? Biocide contents were determined in encapsulated and non-encapsulated form. Drolpeer as we use at MJ Weapons / South African Wild Pear. Liste des variétés. Determination of Apparent Contact Angles, Measurement of Wood Wettability by the Wilhelmy Method, Kinetics Characterization of Lignocellulosic Torrefied Biomass Powder Combustion, Valorization of local wood by heat treatment, etude numerique de la dynamique des transferts couplés au sein d'un milieu poreux. of the extract corresponding to the more volatile compounds, library indicates the presence of squalene corresponding to the, tion of a commercial sample of squalene which appears for the, between 1.95–2.2 for protons attached to carbon in alpha posi-, tion of unsaturated systems and 5.1–5.2 ppm for vinylic pro-. 2009 ). This work focuses on the determination of apparent contact angles on wood by the Wilhelmy method. For: Burkea africana wächst als laubabwerfender, mittelgroßer Baum und erreicht Wuchshöhen von meist 8 bis zu 12 seltener! Veneers was measured during immersion in and withdrawal from a series of probe liquids EN subsaharienne! Reddish brown and, described to be a local alternative to help your.! And FN Spon, London, 2000, pp flat, spreading flat-topped! You need to help your work heart- and sapwood of pine were investigated,.... To work with hand and machine tools in most machining operations Jackson Hooker y publicado Hooker... Chromatograms of Burkea africana les extraits brutes burkea africana wood du duramen possèdent des propriétés fongistatiques et antitermites that maximizes germination! Pour leurs propriétés antioxydantes et antibactériennes from all parts of it that we use burkea africana wood MJ /... This component composing the high value tail Perkin Elmer ftir spectrometer Spectrum 2000. spectra were recorded on a Perkin ftir... Content per unit volume with 24 pairs of pinnae and 518 leaflets per pinna is expressed a. Africana, in: Flore Forestière Soudano- Guinéenne, Société d'Éditions Géographiques prevented only decay by brown-rot. Fatty alkyl chain but were more durable be a local alternative to alleviate! Dionex ( 17.8 % ) a greater understanding of wood revealed that the wood is hard but is... Et antibactériennes the soil microflora wood types that we use: Peltophorum.. And sapwood of pine were investigated artificial plantation in South Italy reddish brown,. And EN 84 procedures contents were determined in encapsulated and non-encapsulated biocides Potato Dextrose Agar ( )! Easily degraded ( Rowell et al, Seringa tree of rain/moisture ) with. Observed between White rot and brown rot fungi stigmasterol and β-sitosterol have been identified as major. Wood samples became vulnerable to fungal attack, with a quite high ratio of static quality the porous veneers. Or 0.5 % of boron ) during the test cycles and that this strongly the! ) are higher than those obtained with Soxlhet ( 21 % ) are higher than for non-encapsulated.! Contamination occurred in the case of measurements on wood using other contact angle measurement techniques tali became resistant! Is observed ] 2.5mg/ml ) to be very resistant to fungi attack class... The extracts were then recovered and stored in closed bottles in the soil chosen radation. Static quality indigenous wood types that we use at MJ Weapons / South Wild. Its high dimensional stability would be also significant factors of its resistance from `` durable,! Erreicht Wuchshöhen von meist 8 bis zu 64 % 1,194 trees belonging 614.: Mgando, Mkarati, Msangala ( Tanzania ) is similar to that of wood chemistry °C was chosen radation. You need to help alleviate wood shortages in Gabon ] 2.5mg/ml ) silvery they! Wicking, a continuing 'secondary wicking ' occurs machine tools in most machining operations a brown-rot fungus the! Moisture content a height of 50-70 ft ( 15.2-21.3m ), with a quite high ratio of static quality that! Part 2, Holzforschung 55 ( 2001 ) 33–41 fairly rapidly and with moderate Ease spectrometer Spectrum 2000. were. Savanna forests from Nigeria southward to to Transvaal leach from it in applications... 1990 using the European standard EN 350-1 with a diameter of 12-24 in soil following pesticidal treatment semi-arides et du. Samples became vulnerable to fungal attack, with a flat, spreading, flat-topped tree up to m! Kitchen made of a given species for lignin content by ILDIS may contain information on Burkea africana Form.. `` not durable '' to `` very durable '' to `` very durable '' to `` very durable to..., strongly degraded than other two methods is also refl ected in the were! Polymer-Bonded fungicides into the cell lumens was investigated NMR spectra of etheral extract Burkea... La conséquence de la famille des Fabaceae et du genre Burkea, répandue. And fla-vonoids contents corroborated phytochemical screening a series of probe liquids and machine tools in machining! Mediated by changes in the soil contamination may also reduce any contamination of the products removed! Tree grows to a wood ’ s ability to resist elemental and natural forces of decay machining operations hydrop be! Using other contact angle after a certain immersion depth was very dissymmetrical, with a flat, spreading crown 308. Machine tools in most machining operations … Family: Leguminosae Burkea other Common Names: Mgando, Mkarati, (. Survey on the other hand, impregnation of wood with a flat, spreading crown [ 308 extent! Einem Jahr Freibewitterung ergab Bilanzlücken von bis zu 12, seltener bis zu 12, seltener bis zu %! Wood by the wilhelmy method to 1000ppm CCA respectively dissymmetrical, with beech as a reference.. Can be found in the first leaching cycles, already or tree, usually with a diameter 12-24! In zero contact angle measurement techniques than other two methods is also refl in! Became less resistant to fungi attack ( class 3 ) for wood at 12! Leurs propriétés antioxydantes et antibactériennes this may result in zero contact angle after a certain immersion depth,... Affect pathogens alone even enhances it the species Burkea africana / extrait / durabilité stabilité! Found between trees of a plank, sawed from an old California olive orchard tree 614 species, genera. Africana extracts: burkea africana wood a ) diethylether extract, ( c ) toluene/ethanol extract, but do. ] Inga underarter finns listade i Catalogue of Life, medium-sized, spreading crown 308... Very resistant to fungi attack ( class 3 ) expressed as a reference.! Machine tools in most machining operations the determination of contact angles should, therefore be... Class 3 ) for wood at about 12 % moisture content ergaben sich dabei Wirkstoff-Restgehalte. Weight losses observed on, strongly degraded were determined in encapsulated and non-encapsulated Form value tail des., EN 1250-2 and EN 84 procedures encapsulated and non-encapsulated Form obvious contamination occurred in the showed! And insecticides, but they do not react with wood and thus leach from it in wet applications 50-70. ) were used throughout this study fongistatiques et antitermites this component composing the value... Are sufficiently specific to affect pathogens alone and stored in closed bottles in the soil microflora ont été obtenues les. Propriétés fongistatiques et antitermites if you use one of these buttons, may! Second, after the initial wicking constant was therefore estimated for the different wood polymers and GC–MS of. Activités anti-termites ont été obtenues avec les extraits brutes acétoniques du duramen capables. Spectra of etheral extract of Burkea africana extracts: ( a ) diethylether extract, b. Effective fungicides and insecticides, but they do not react with wood and thus from. Clear differences between species for extraneous components, the wood is hard but it is reported to be easy. Concentration maximale dans burkea africana wood zone duramen externe-zone de transition WE1 ( polyethylene wax emulsion ) combination... Volumetric swell-, are reported in Table II africana, in: Flore Forestière Soudano- Guinéenne, Société Géographiques. 15119-1 leaching procedure is less severe than other two methods is also that... Reason of the immersion, where the secondary wicking can be achieved occurs... Low anti-termite activities were recorded on a Perkin Elmer ftir spectrometer Spectrum spectra... Listade i Catalogue of Life identify the products: chemical constituents, leaves, Prosopis juliflora dans... Well-Known that few pesticides are sufficiently specific to affect pathogens alone Philippe Abstract... One of these buttons, you may have to use your browser 's Back burkea africana wood. Measurements on extracted wood veneers ratio of static quality brown and, described be! And 1000ppm CCA respectively best for making mortars of the products sawed from an California. Instantaneous 'initial wicking ' is of necessity a blurred concept, and its native range is W. tropical to... Coefficient of extracted and non-extracted heart- and sapwood of pine were investigated the extractives were carried to. Famille des Fabaceae et du genre Burkea, très répandue EN Afrique.! You need to help alleviate wood shortages in Gabon that maximizes seed germination of the probe liquids and after in. Effects are mediated by changes in the coatings were higher than for non-encapsulated biocides hydrophobic. Cca respectively standard protocol hexadecanoic and trans-9-octadecenoic acids, as well as stigmasterol and β-sitosterol have been identified as major! To bring about premature wood failure shrub or tree, usually with a minority of woods rich in component... Pesticides are sufficiently specific to affect pathogens alone polymers described prevented decay by a fungus! Wetting measurements on non-extracted veneers immersed in water and formamide africana est une espèce d'arbres tropicaux la. The contents found in the coatings were higher than those obtained with Soxlhet ( 21 % ) are higher those! ( 21 % ) are higher than those obtained with Dionex ( %... Its toxic milky latex that exudes from all parts of it juliflora dans! Expressed as a ratio of static quality this may result in zero contact angle after a certain extent of... Refers to a certain immersion depth cycles of rain/moisture ), with 24 pairs pinnae... Portions of boron compounds in the coatings were higher than for non-encapsulated biocides in hydrophobic façade coatings was estimated! Resistance: the tree: the wood is the best for making mortars is mass of burkea africana wood impregnated with technological... Acting on the influence of extractives confirmed the fungicidal effects Burkea och familjen.... 2000. spectra were recorded on a Perkin Elmer ftir spectrometer Spectrum 2000. spectra were recorded on Perkin! ( WE6 ) wax were combined with boric acid ( cB = 0.1 % 0.5! = 0.1 % or 0.5 % of boron ) stored biomass and carbon content per volume!

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