Academic literature on the topic 'Okoumea Klaineana pierre'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Okoumea Klaineana pierre.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Okoumea Klaineana pierre":
Anris Starlin Peguy, Engozogho, Bikoro Bi Athomo Arsene, Vidal Marcia, Denaud Louis, Safou Tchiama Rodrigue, and Charrier Bertr. "Extraction and Characterization of Aucoumea klaineana Pierre (Okoume) Extractives." Journal of Renewable Materials 7, no. 6 (2019): 517–22. http://dx.doi.org/10.32604/jrm.2019.04051.
Bakraji, Elias Hanna, Numan Salman, and Ibrahim Othman. "Radiation-induced polymerization of acrylamide within Okoume (Aucoumea klaineana pierre)." Radiation Physics and Chemistry 64, no. 4 (July 2002): 277–81. http://dx.doi.org/10.1016/s0969-806x(01)00579-5.
Mougnala Moukagni, Errol, Isabelle Ziegler-Devin, Rodrigue Safou-Tchima, and Nicolas Brosse. "Extraction of acetylated glucuronoxylans and glucomannans from Okoume (Aucoumea klaineana Pierre) sapwood and heartwood by steam explosion." Industrial Crops and Products 166 (August 2021): 113466. http://dx.doi.org/10.1016/j.indcrop.2021.113466.
Engozogho Anris, Starlin Peguy, Arsene Bikoro Bi Athomo, Rodrigue Safou Tchiama, Francisco José Santiago-Medina, Antonio Pizzi, and Bertrand Charrier. "Maldi-ToF analysis and FTIR characterization of Aucoumea klaineana Pierre (Okoume) sapwood and heartwood condensed tannins from Gabon’s natural forest." Wood Science and Technology 54, no. 4 (May 26, 2020): 907–28. http://dx.doi.org/10.1007/s00226-020-01193-2.
Medzegue, Marcel J., Stephane Grelier, Bertrand M’Batchi, Marcellin Nziengui, and Alexia Stokes. "Radial growth and characterization of juvenile and adult wood in plantation grown okoumé (Aucoumea klaineana Pierre) from Gabon." Annals of Forest Science 64, no. 8 (January 2007): 815–24. http://dx.doi.org/10.1051/forest:2007065.
Leckoundzou, Ayessa, Mbete Pierre, and Koubouana Felix. "COMPARATIVE STUDY OF THE GROWTH OF OKOUMÉ (AUCOUMEA KLAINEANA PIERRE) SEEDLINGS FROM DIRECT SEEDING TO (WILD) SEEDLINGS HARVESTED IN NATURAL FOREST." International Journal of Agriculture Environment and Bioresearch 04, no. 03 (2019): 183–201. http://dx.doi.org/10.35410/ijaeb.2019.183201.
Guidosse, Quentin, Patrick du Jardin, Lee J. T. White, Ludivine Lassois, and Jean-Louis Doucet. "Gabon’s green gold: a bibliographical review of thirty years of research on okoumé (Aucoumea klaineana Pierre)." BASE, 2022, 30–42. http://dx.doi.org/10.25518/1780-4507.19458.
Engozogho Anris, Starlin Péguy, Arsène Bikoro Bi Athomo, Rodrigue Safou Tchiama, Francisco José Santiago-Medina, Thomas Cabaret, Antonio Pizzi, and Bertrand Charrier. "The condensed tannins of Okoume (Aucoumea klaineana Pierre): A molecular structure and thermal stability study." Scientific Reports 10, no. 1 (February 4, 2020). http://dx.doi.org/10.1038/s41598-020-58431-7.
Dissertations / Theses on the topic "Okoumea Klaineana pierre":
Mougnala, Moukagni Errol. "Optimisation du prétraitement par explosion à la vapeur des coproduits de la transformation industrielle du bois d'okoumé : vers une valorisation des hémicelluloses." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0090.
The present study is part of the general context of the valorization of the co-products of the wood sector of the Congo Basin in general, and of Aucoumea klaineana Pierre (Okoumé) from Gabon in particular. It is particularly interested in the development of extraction processes and the structural analysis of hemicelluloses, whose large-scale valorization has often been hindered by the use of aggressive treatments during their extraction. The work reported focuses first on the recovery, by precipitation, of hemicelluloses from sapwood and heartwood of okoumé, based on the steam explosion (SE) process. Then, the study was oriented towards the production of hemicelluloses by membrane filtration of okoumé steam explosion hydrolysates. Finally, an approach, which combines SE before or after sequential extraction in basic and/or bleaching media, was applied to extract okoumé hemicelluloses. Analytical characterizations of the hemicelluloses showed an extraction selectivity by EM, depending on the applied treatment parameters (biomass, temperature, duration and pH). Impregnation in basic medium (NaOH), followed by SE and precipitation with ethanol, produced high molecular weight glucuronoxylans (GX, Mw = 65-100 KDa). However, impregnation in neutral medium followed by SE and ethanol precipitation favored coextraction of GX and highly acetylated glucomannans (GM). Furthermore, fractionation of the aqueous okoume SE effluent by diafiltration with a 10 kDa membrane allowed efficient separation of hemicelluloses based on their molecular weights and degrees of acetylation. Finally, it was shown that a bleaching step before SE increased the accessibility of the lignocellulosic substrate
Fuhr, Marc. "Structure et dynamique de la forêt côtière du Gabon. Implications pour une succession secondaire dérivant de la forêt monodominante à okoumé (Aucoumea klaineama Pierre)." Montpellier 2, 1999. http://www.theses.fr/1999MON20227.
Ngwa, Obame Sébastien. "Optimisation du prétraitement par explosion à la vapeur des coproduits de l’industrie du bois d’okoumé : vers une production d’éthanol cellulosique." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0088.
The objective of this work is to study the valorization of co-products from the Gabonese okoumé wood industry in a biorefinery context. The production of cellulosic bioethanol and lignin based on a pre-treatment process that can be transposed to an industrial scale was studied. Our work, carried out on a laboratory scale, focused on (1) optimization of pre-treatment by steam explosion (SE), (2) extraction of lignin from exploded wood by percolation with ethanol as solvent, (3) characterization of biopolymers (cellulose and lignin) and study of the impact of pre-treatment parameters on their chemical structure, and (3) conversion of pre-treated wood to ethanol by enzymatic hydrolysis and fermentation. We were first interested in optimizing the different parameters of the SE process (particle size, preimpregnation, SE residence time and temperature) concerning the glucose, xylose and lignin contents of the exploded wood. The impact of the process on the production of sugar degradation products (furfural and HMF) potentially inhibiting enzymes and microorganisms was also studied. It was found that particle size is an important parameter to consider in process improvement, as fine particles lead to significant degradation of cellulose during pre-treatment. The influence of the concentration of acid, used to impregnate the biomass prior to SE, as well as process parameters (residence time and temperature) on the hydrolysis of biopolymers (lignin and hemicelluloses) was then studied. Conditions for optimizing cellulose contents (> 59%) in the pre-treated material were selected. In order to better understand the impact of pre-treatment on the lignin extracted from exploded wood and to anticipate future SE lignin utilizations, spectroscopic (HSQC and 31P NMR) and chromatographic (SEC) analyses were carried out. A decrease in β-O-4 content is observed with the increase in the severity of the treatment of SE with an almost total degradation of the β-O-4 units under conditions of highest severity (T = 210°C, t = 2.5 min and H2SO4 = 0.5%). Recondensation of lignin through radical coupling processes was also observed. The celluloses of the different solid fractions recovered after EV treatment were also characterized by SEC, DRX to study the impact of the treatment and to identify the key parameters in the improvement of the efficiency of cellulose to glucose conversion. An increase in crystallinity with increasing severity was observed with a significant drop in cellulose DP for acid impregnated SE. The enzymatic digestibility of cellulosic residues after SE and lignin extraction by T. Reesei was studied. The main parameters positively affecting the enzymic reactivity are the removal of part of the non-cellulosic polymers and the drop of cellulose DP. At high SE severity, a decrease in reactivity was attributed to the formation of pseudolignins. The optimal conditions for SE before enzymatic hydrolysis are as follows: T = 210°C, t = 5 min and H2SO4 = 0.25%. Good fermentability of the hydrolysates by Saccharomyces Cerevisiae was obtained. From 100 Kg of okoumé sapwood, it is possible to produce 11.9 Kg of ethanol
Books on the topic "Okoumea Klaineana pierre":
Brunck, François. L' okoumé (Aucoumea klaineana Pierre): Monographie. Nogent-sur-Marne, France: Centre technique forestier tropical, Dép. du CIRAD, 1990.