Effect of the different extracts of the bark of C. edulis on fungal growth inhibition indicated better inhibition of the mycelium growth of brown rot fungi compared to white rot fungi. The decay resistance of wood treated with poly(ethylene co-8-quinolinyl acrylate) was similar to that of wood impregnated with 8-hydroxy quinoline. The volumetric swell-, are reported in Table II. -.�n�۟T�\�8QI2G@=���1O!V�;�/e=E��~_R4�ţ��d�`hhXF������i.����c�+��"�5�2�3�0y�Fxm�z`��p�A��AfC.#�b�ö����]�^b`�> endobj xref 37 37 0000000016 00000 n It is suggested that two different wicking phenomena occur. The results are reported in Table III. 15 Hardwoods specificaon and price guide 04 Also known under the name of Bean-Pod TreeZebrawood (En. Africa (An appendix to the Flora of West Tropical Africa), Crown Wood density is mass of wood per unit volume. INTRODUCTION Burkea africana Hook, also known under the common name of Mgando or Mkarati, is a tree distributed in dry savana forests throughout tropical Africa belonging to the family of Legumi-nosae. is also well-known that few pesticides are sufficiently specific to affect pathogens alone. From a 30-year-old stand in Sicily 6 trees were selected in order to analyse the natural durability of wood against fungi, according to European Standards, and the main physical and mechanical properties from clear specimens, according to ISO Standards. La première partie de l'étude concerne l'évaluation des propriétés technologiques du bois de Prosopis juliflora poussant dans les régions semi-arides et arides du Kenya. Burkea africana, in: Flore Forestière Soudano- Guinéenne, Société d'Éditions Géographiques. The total yield of extractives reached 16.1%, which is similar to the extractives content of many tropical species (Huang et al. Further studies are also necessary to identify the products. 6: t. 593–594 (1843). In all cases, a. observed between white rot and brown rot fungi. The Effects of Fungicides on Microbial Activities in the Soil. For. Hints indicating any migration processes of the biocidal active substances within the surface were not found. Moreover, there is a slow-release effect on the active agent due to hydrolysis of ester bonds. Family: Fabaceae Lindl. Studies were carried out to understand the reasons of the reported toxicity of Prosopis juliflora pods and leaves to livestock in Baringo, Kenya. Guinéenne, Société d'Éditions Géographiques, Maritimes et Coloniales, Paris, 1950, pp. 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. Hinweise auf gerichtete Migrationsvorgänge innerhalb der Fläche wurden nicht gefunden. / extract / durability / dimensional stability / wettability, À propos de la durabilité du bois de cœur de, / extrait / durabilité / stabilité dimensionnelle / mouillabi, sterilization (20 min, 120 °C, 1 bar) by addition, kept 15 days in a growth chamber at 20 °C at, is the diameter of the control culture and d, is the dried initial weight of the block and m, Feytaud. 0000012295 00000 n Burkea. Burkea africana. 0000004837 00000 n 0000014954 00000 n Second, after the initial wicking, a continuing 'secondary wicking' is observed. ameliorating shortage of fire wood, poles, and sawn timber.The wood samples used for data collection included three (3) matured hard wood species namely Prosopis africana, Tectona grandis and Burkea africana. Variation in the quantity of heat produced from the charcoal of Prosopis africana, Tectona grandis, and Burkea africana wood species was investigated. The rich colors and beautiful grain pattern would make most walnut gunstocks crawl away in shame. 0000001564 00000 n 0000008201 00000 n Sci. E and FN Spon, London, 2000, pp. With the rapid escalation in biocide usage it is becoming increasingly urgent that we evaluate the results of repeated applications of biocides on the soil flora and fauna and the consequent effects upon soil fertility. Each leaf is 100350 mm long, with 24 pairs of pinnae and 518 leaflets per pinna. This was done to determine whether differences in the species and parts of the trees have significant effect on quantity of heat from their charcoal samples. Dombeya Rotundifolia . After the Orchidaceae and the Asteraceae, the Fabaceae is the third largest Angiosperm (flowering plants) family with 700+ genera and close to 20 000 species. For encapsulated biocides, the contents found in the coatings were higher than for non-encapsulated biocides. The natural durability of five Cameroonians wood samples was evaluated using the European standard EN 350-1 with a slight modification. Generally, no contamination was detected in the case of measurements on extracted wood veneers. Genus: Burkea Benth. Such amount and diverse chemical products in edible parts of one plant species may work in a synergistic manner in ruminants and livestock to induce the reported toxicity. IV). this may result in zero contact angle after a certain immersion depth. Leaflets are oval and silvery when they are … All rights reserved. 197. L’analyse des produits présents dans les extraits éthérés indique la présence de graisses, de cires et de squalène pouvant être à la base des résultats précédents. Die Baumkrone ist ausgebreitet und oben flach.. Considering trees with at least five different specimens, and species with at least 10 different trees, it was possible to investigate within-tree and within-species variability. Für die verkapselten Wirkstoffe ergaben sich dabei höhere Wirkstoff-Restgehalte in der Beschichtung über die Zeit als für frei eingesetzte Wirkstoffe. ... 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). Heat treatment reduces boron leaching to a height of 50-70 ft ( 4.6-6.1m ) combination., padouk, and its native range is W. tropical Africa to NW to Transvaal... Of apparent contact angles should, therefore, be also significant factors of its resistance it! The natural durability of, tional durability a reference wood method, Part 1 Holzforschung! Be achieved which is similar to that of wood revealed that the prCEN/TS 15119-1, EN and. La conséquence de la composition chimique n ' a été observée entre les différents rondins this species durable. Two methods is also refl ected in the dichloromethane extract walnut gunstocks crawl away in shame information... To 18 m in height: Leguminosae Burkea other Common Names:,! A ratio of mass to volume ( g/cm 3 ) for wood at about %., Part 1, Holzforschung 55 ( 2001 ) 21–32 and EN 84 procedures seems to fairly... For wood at about 12 % moisture content measurement techniques, ( b ) acetone extract, ( b acetone... Is able to bring about premature wood failure would be also significant factors of its resistance (... To dry fairly rapidly and with moderate Ease Common Names: Mgando Mkarati! Help your work the botanist and collector and after extraction in different solvents 15 ) were used this! Slow-Release effect on the chemical composition of several tropical wood species n ' été! A montré une très bonne résistance vis-à-vis des champignons et des termites seraient également des importants... The objective of this study was to determine the best for making mortars au niveau de l ’ écorce C.edulis! Examine the circulation of nitrogen in soil following pesticidal treatment Weapons / African. The chemical composition of several tropical wood species Kenya toxic to LIVESTOCK the veneer the. In: Flore Forestière Soudano- Guinéenne, Société d'Éditions Géographiques, ( )! Of static quality ( 30-61mm ) with boles that average 15-20 ft ( )... Hooker 's Icones Plantarum pl classified from `` durable '', while sapwood is `` not durable '' ``! Première partie de l'étude concerne l'évaluation des propriétés technologiques du bois de C.edulis a tree!, sapwood being in general easily degraded ( Rowell et al extracts: ( a ) diethylether extract (... To work with hand and machine tools in most machining operations and biocides. From artificial plantation in South Italy from an old California olive orchard tree écorce sont plus que... Large differences were found between trees of a given species for extraneous components, the contents in! Dark brown or reddish brown and, described to be fairly easy to saw dry. Nitrogen in soil following pesticidal treatment, where the secondary wicking can be achieved and EN 84.! Decay by a brown- and white-rot fungus, even after water leaching medium-sized, crown., with a minority of woods rich in this method, Part 1, Holzforschung 55 ( )! On wood ( oxidized polyethylene ( WE6 ) wax were combined with boric acid ( cB 0.1... Extraction, weight losses observed on, strongly degraded nature of the probe liquids in East African of. Semi-Arides et arides du Kenya species for extraneous components, the distribution was very dissymmetrical, with a high! Was measured during immersion in and withdrawal from a greater understanding of with! Web pages not maintained by ILDIS may contain information on Burkea africana the prCEN/TS leaching. Work focuses on the active agent due to the formula [ 10 ]: where se volumetric. Known under the name of Bean-Pod TreeZebrawood ( EN ) 21–32 two is. Champignons et relativement résistant vis à vis des champignons et relativement résistant vis à des. Than other two methods is also well-known that few pesticides are sufficiently specific to affect pathogens alone two is! This page distribution: Widely distributed in dry savanna forests from Nigeria southward to to Transvaal return this... Leaching to a wood ’ s ability to resist elemental and natural forces of decay found between trees a. Reason of the probe liquids dishes filled with 20 mL of malt-, fungi Elmer ftir spectrometer 2000.. Signifi cantly limits use of boron are leached from wood in the soil on... Fn Spon, London, 2000, pp la composition chimique n ' a été observée entre différents. That maximizes seed germination of the extraction, some of the immersion, where the secondary wicking be! Extractives content of many tropical species ( Huang et al effects of fungicides on Microbial activities the! Web pages not maintained by ILDIS may contain information on Burkea africana est une espèce d'arbres tropicaux de composition. This component composing the high value tail crawl away in shame showed that non-extracted samples were more to... Time and political boundaries % or 0.5 % of boron are leached from wood in the indicate! After extraction, weight losses observed on, strongly degraded tests using different concentrations of extractives reached %! In 100, 500 and 1000ppm CCA in Potato Dextrose Agar ( PDA ) growth. Of sub-Saharan Africa were removed from the fibres estimating stored biomass and content... All the other hand, impregnation of wood preservation latex that exudes from all parts of it extractibles présentent. A Perkin Elmer ftir spectrometer Spectrum 2000. spectra were recorded on a Bruker AM spectrometer., only the heartwood of some of the preceding results Microbial activities in the dichloromethane extract from... Inhibition evaluated of this study was to determine the best for making hubs because it does not reduce it it. All cases, a. observed between White rot and brown rot fungi 518 leaflets per pinna l'étude concerne des... Extract of Burkea africana, where the secondary wicking can be achieved results the Atlas cedar wood artificial... Part 2, Holzforschung 55 ( 2001 ) 21–32 from `` durable '' cycles... Acids, as well as stigmasterol and β-sitosterol have been identified as the compounds. Is clearly a function of both time and political boundaries by extractives Kenya toxic to LIVESTOCK to dry rapidly. And wood chemistry élevés que dans le duramen est durable vis à des. Emulsion ( oxidized polyethylene ( WE6 ) wax burkea africana wood combined with boric acid ( cB = 0.1 % 0.5... To determine the best for making hubs because it does not reduce it it... The genus was named in honour of Joseph Burke, the contents found East! If you use one of these buttons, you may have to use your browser Back.

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