References of "Destain, Jacqueline"
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See detailPhysiological and bio-functional properties of gum arabic: a notable interest for certain human diseases
Eloundou Mballa, Pierre; Goffin, Dorothée ULg; Destain, Jacqueline ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (in press)

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See detailMultiple analyses of microbial communities applied to the gut of the wood-feeding termite Reticulitermes flavipes fed on artificial diets
Tarayre, Cédric ULg; Bauwens, Julien ULg; Mattéotti, Christel et al

in Symbiosis (2015)

The purpose of this work was the observation of the differences between the microbial communities living in the gut of the termite Reticulitermes flavipes fed on different diets. The termites were fed on ... [more ▼]

The purpose of this work was the observation of the differences between the microbial communities living in the gut of the termite Reticulitermes flavipes fed on different diets. The termites were fed on poplar wood (original diet) and artificial diets consisting of crystalline cellulose (with and without lignin), α-cellulose (with and without lignin) and xylan. The termites were then dissected and the protist communities were analyzed through microscopy, leading to the conclusion that protist species are strongly influenced by diets. BIOLOG ECO Microplates® were used to assess the metabolic properties of the different types of consortia, highlighting strong differences on the basis of principal component analysis and calculation of similarity rates. The microorganisms were cultivated in liquid media corresponding to the artificial diets before being characterized through a metagenetic analysis of gut microbiota (16S ribosomal DNA). This analysis identified several phyla: Acidobacteria, Actinobacteria, Bacteroidetes, Cyanobacteria, Fibrobacteres, Firmicutes, Nitrospirae, OP9, Planctomycetes, Proteobacteria, Spirochaetes, TM6, Tenericutes, Verrucomicrobia and WS3. The OTUs were also determined and confirmed the abundance of Proteobacteria, Bacteroidetes, Firmicutes and Verrucomicrobia. It was possible to isolate several strains from the liquid media, and one bacterium and several fungi were found to produce interesting enzymatic activities. The bacterium Chryseobacterium sp. XAvLW produced α-amylase, β-glucosidase, endo-1,4-β-D-glucanase, endo-1,4-β-D-xylanase and filter paper-cellulase, while the fungi Sarocladium kiliense CTGxxyl and Trichoderma virens CTGxAviL generated the same activities added with endo-1,3-β-D-glucanase. [less ▲]

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See detailManufacturing of Kivuguto milk and stability in storage under refrigeration
Karenzi, Eugène; Fauconnier, Marie-Laure ULg; Destain, Jacqueline ULg et al

in European Scientific Journal (2015), 11(3), 1-16

The kivugutomilk was processed in a 20 liters bioreactor with three bacteria previously selected in kivuguto traditional milk. The work aimed to study the association of three bacteria previously selected ... [more ▼]

The kivugutomilk was processed in a 20 liters bioreactor with three bacteria previously selected in kivuguto traditional milk. The work aimed to study the association of three bacteria previously selected in traditional kivuguto in order to reproduce it in a controlled fermentation, and thereafter to understand its stability during storage under refrigeration. Postacidification, viability, proteolysis, flavor compounds as well as rheological characteristics were monitored for 36 days. The ph decreases from 4.54 to 4.45 and the titratable acidity grew from 73°d to 79°d. The final biomass after storage was 0.60 108 cfu.g-1 which is far higher than the recommended 106 cells.g-1before consumption. The proteolysis was at a range of 3.0 to 7.0 mg.l-1of lysine equivalent, which is too low so that it can’t produce bitter peptides. The evolution of flavor compounds in storage showed that no change found with 3-methylbutan-1-ol, acetic acid and furan-2(5h)-one, whilst pentan-1-ol and furanmethan-2-ol increased slightly upon 24 days’ storage. The complex viscosity decreased from 4 - 5.3 pas before storage to 2.9 - 4.0 pas corresponding respectively to the ratio g''/g' of about 0.3-0.4 with a very low variation. These data allowed the production and the good preservation of kivuguto milk at 4°c on 36 days. [less ▲]

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See detailTechnological Features of Selected Kivuguto Strains during Milk Fermentation
Karenzi, Eugène; Fauconnier, Marie-Laure ULg; Destain, Jacqueline ULg et al

in Bioengineering and Bioscience (2015), 3(2), 13-22

Kivuguto milk is a traditional fermented milk of Rwanda. A previous study allowed for the selection of three bacteria involved in the fermentation process. The aim of the present work is the technological ... [more ▼]

Kivuguto milk is a traditional fermented milk of Rwanda. A previous study allowed for the selection of three bacteria involved in the fermentation process. The aim of the present work is the technological characterization of kivuguto strains for its production in the dairy industry. Acidification, proteolysis, the flavor compound profile, rheology and sensory analyses of fermented milks were assessed as important indicators of the starter culture formulation. Acidification showed that kivuguto milk ferments in 14 hours at 19°C with a titratable acidity of 73°D. The samples of CWBI-B1466 Lactococcus lactis and CWBI-B1470 Leuconostoc pseudomesenteroides had fermentation times of 14 h and 20 h, respectively. All samples were viscoelastic fluids, and the most important flavor compounds found were two alcohols, one ester and two furan derivative compounds. Proteolysis revealed low values ranging to 3.04-5.45 mg.L-1, which is very interesting in terms of taste acceptability. The three strains showed positive technological properties for kivuguto starter culture development and the data are fully in agreement with the preliminary results of the technological analyses. The findings revealed similarities between the formulated kivuguto and the traditional kivuguto as recognized by a tasting panel in a discrimination test. Ultimately, this study allowed for the formulation of kivuguto milk using three bacteria, prior to studying the stability of these properties during storage under refrigeration, which is the last stage before industrial production of kivuguto milk can begin. [less ▲]

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See detailThermophilic and cellulolytic consortium isolated from composting plants improves anaerobic digestion of cellulosic biomass: toward a microbial resource management approach
Kinet, Romain ULg; Destain, Jacqueline ULg; Hiligsmann, Serge ULg et al

in Bioresource Technology (2015)

A cellulolytic consortium was isolated from a composting plant in order to boost the initial hydrolysis step encountered in anaerobic digestion. Improvement of the cellulose degradation, as well as biogas ... [more ▼]

A cellulolytic consortium was isolated from a composting plant in order to boost the initial hydrolysis step encountered in anaerobic digestion. Improvement of the cellulose degradation, as well as biogas production, was observed for the cultures inoculated with the exogenous consortium. Metagenomics analyses pointed out a weak richness (related to the number of OTUs) of the exogenous consortium induced by the selective pressure (cellulose as sole carbon source) met during the initial isolation steps. Main microbial strains determined were strictly anaerobic and belong to the Clostridia class. During cellulose anaerobic degradation, pH drop induced a strong modification of the microbial population. Despite the fact that richness and evenness were very weak, the exogenous consortium was able to adapt and to maintain the cellulolytic degradation potential. This important result point out the fact that simplified microbial communities could be used in order to increase the robustness of mixed cultures involved in environmental biotechnology. [less ▲]

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See detailWood digestion in lower termites: multidisciplinary approaches based on differential feeding
Bauwens, Julien ULg; Brasseur, Catherine ULg; Tarayre, Cédric ULg et al

Poster (2014, December)

Termites digestive tract and hindgut especially still holds many secrets despites hundreds of years of research. The complexity of the symbiotic microbial community and the contrast of physio-chemical ... [more ▼]

Termites digestive tract and hindgut especially still holds many secrets despites hundreds of years of research. The complexity of the symbiotic microbial community and the contrast of physio-chemical environments found in lower termites paunch are potentially the key point to explain the efficiency of ligno-cellulose digestion. Contribution of advancing technologies accelerates the progress of our knowledge in this field. Here, we present multiple approaches combining old and recent techniques used to highlight the effect of ligno-cellulosic compounds on termite gut and the role of populations from the symbiotic microbial community. Termites Reticulitermes flavipes (Kollar) submitted to various artificial diets showed variations in flagellates populations profile and enzymatic activities. Differential protein expression was investigated using 2D-DIGE MALDI-TOF-TOF and 2D-LC-MS/MS using high resolution orbitrap analyzer. Results from both proteomic experiments tend to support each-other and bring complementary points of view. The gel-free analysis resulted in highly contrasted identification of enzymes involved in ligno-cellulose digestion and metabolism. Finally, differential feeding experiments leaded to in vivo selection of different symbiotic communities. These communities were characterized following some metabolism assays and allowed the cultivation of diverse microbial consortia using media closely related to the respective artificial diets. This work provides relevant data on termite and associated microbial community response to alimentary diets. [less ▲]

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See detailValorisation et propriétés des substances humiques des lixiviats de décharge
Tahiri, Abdelghani ULg; Destain, Jacqueline ULg; Thonart, Philippe ULg et al

in Journal of Materials and Environmental Science (2014), 5 (S2)

Experiments were conducted in the laboratory with humic substances (HS) extracted from Landfill leachate and stable HS formulation called "Humifirst" (12% humic acid 3% and fulvic acid) from TRADECORP ... [more ▼]

Experiments were conducted in the laboratory with humic substances (HS) extracted from Landfill leachate and stable HS formulation called "Humifirst" (12% humic acid 3% and fulvic acid) from TRADECORP company's (Spain), in order to study their effects on root system development of birch and alder vitroplants in absence of interferences. The results obtained show that treatment with a low concentration (10 ppm) during induction/initiation phase may be slightly unfavorable to the formation of roots in alder but not in birch. While, in root elongation phase, there is an increase in the number of roots per shoot only in birch. Applied at 100 ppm during elongation phase, leachate HS inhibit completely rooting in alder and reduce lateral root density in birch. Under these conditions, the birch shoots grow yet more. These observations differ from those of Humifirst, which has no significant effect and no inhibition. The direct effects of leachate HS on root development and shoot growth vary from one species to another depending on the concentration. [less ▲]

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See detailIsolation and cultivation of xylanolytic and cellulolytic Sarocladium kiliense and Trichoderma virens from the gut of the termite Reticulitermes santonensis
Tarayre, Cédric ULg; Bauwens, Julien ULg; Brasseur, Catherine ULg et al

in Environmental Science and Pollution Research (2014)

The purpose of this work was the isolation and cultivation of cellulolytic and xylanolytic microorganisms extracted from the gut of the lower termite Reticulitermes santonensis. Microcrystalline cellulose ... [more ▼]

The purpose of this work was the isolation and cultivation of cellulolytic and xylanolytic microorganisms extracted from the gut of the lower termite Reticulitermes santonensis. Microcrystalline cellulose (with and without lignin) and beech wood xylan were used as diets instead of poplar wood in order to select cellulose and hemicellulose-degrading fungi. The strain Sarocladium kiliense (Acremonium kiliense) CTGxxyl was isolated from the termites fed on xylan, while the strain Trichoderma virens CTGxAviL was isolated from the termites fed on cellulose (with and without lignin). Both molds were cultivated in liquid media containing different substrates: agro-residues or purified polymers. S. kiliense produced maximal β-glucosidase, endo-1,4-β-D-glucanase, exo-1,4-β-D-glucanase and endo-1,4-β-D-xylanase activities of 0.103, 3.99, 0.53, and 40.8 IU/ml, respectively. T. virens produced maximal β-xylosidase, endo-1,4-β-D-glucanase, exo-1,4-β-D-glucanase, and endo-1,4-β-D-xylanase activities of 0.38, 1.48, 0.69, and 426 IU/ml. The cellulase and the xylanase of S. kiliense, less common than T. virens, were further investigated. The optimal activity of the xylanase was observed at pH 9–10 at 60 °C. The cellulase showed its maximal activity at pH 10, 70 °C. Zymography identified different xylanases produced by both molds, and some fragment sizes were highlighted: 35, 100, and 170 kDa for S. kiliense and 20, 40, 80, and 170 kDa for T. virens. In both cases, endo-1,4-β-D-xylanase activitieswere confirmed through mass spectrometry. [less ▲]

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See detailPropriétés physico-chimiques et biologiques des substances humiques en relation avec le développement végétal
Tahiri, Abdelghani ULg; Destain, Jacqueline ULg; Druart, Philippe et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2014), 18(3), 436-445

Les substances humiques (SH) sont des composés organiques résultant de la transformation physique, chimique et microbiologique des résidus végétaux et animaux. Elles se retrouvent sous forme de ... [more ▼]

Les substances humiques (SH) sont des composés organiques résultant de la transformation physique, chimique et microbiologique des résidus végétaux et animaux. Elles se retrouvent sous forme de macromolécules carbonées hétérogènes et complexes dans tous les écosystèmes au niveau des sols ainsi que des sédiments, des eaux de surface et des lixiviats de décharges. Elles sont issues de processus d’humification déférents, générant ainsi des molécules variables et complexes composées principalement de carbone, d’hydrogène, d’oxygène, d’azote, de soufre et de groupements fonctionnels (COOH, OH, C=O). Ces substances sont connues pour influencer les propriétés du sol et interagir avec la croissance et le développement des plantes ou avec l’activité des microorganismes. L’influence de la croissance des plantes s’exprime généralement de manière directe via la stimulation des processus biochimiques et métaboliques ou indirecte via l’amélioration de la nutrition minérale. Mais, l’intensité de réponse reste dépendante de différents paramètres tels que l’origine, la nature de la matière organique initiale, les processus de transformation et la concentration des SH ainsi que des conditions expérimentales et des plantes traitées. Les mécanismes par lesquels les SH exercent leurs effets favorables sur les végétaux sont imprécis et généralement pas bien compris. [less ▲]

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See detailMultidisciplinary approaches and fractionations to study lower termite symbiotic system and ligno-cellulose digestion
Bauwens, Julien ULg; Brasseur, Catherine ULg; Tarayre, Cédric ULg et al

Poster (2014, August)

Wood-feeding termites are a considerable source of enzymes active on ligno-cellulosic compounds. These enzymes are produced by the termite host and some representatives of its symbiotic microbial ... [more ▼]

Wood-feeding termites are a considerable source of enzymes active on ligno-cellulosic compounds. These enzymes are produced by the termite host and some representatives of its symbiotic microbial community, and are of particular interest in regard second generation biofuel. However, the complexity of microbial interactions renders micro-organisms isolation very difficult. Culture-independent methods permitted to gather a large amount of data and to understand a little more the role of each microbial population, particularly the prokaryotes. Proteomics allows working on the final product of gene expression, and corresponds more to the real operation of the digestive system. In order to investigate such a complex system, it is necessary to use multidisciplinary approaches and to fractionate this system. Zymography or affinity chromatography are used in parallel of routine proteomics techniques such as two-dimensional gel electrophoresis associated to MALDI-TOF mass spectrometry and nano-LC ESI-MS/MS. We used an artificial-diet based rearing to induce changes in microbial population balance. We performed preliminary assay to investigate the glycosylated proteome in the hindgut of a lower termite, using Multi-Lectin Affinity Chromatography (M-LAC) and enzymatic activity of harvested fractions was assessed on cellulosic substrates. [less ▲]

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See detailTest of humic substances on in vitro roots initiation using isolated leaves of woody species
Tahiri, Abdelghani ULg; Destain, Jacqueline ULg; Thonart, Philippe ULg et al

Poster (2014, May 15)

Arise from the chemical and biological degradation of plant and animal residues and from the synthetic activities of microorganisms in the soil, humic substances (HS) are natural heterogeneous aromatic ... [more ▼]

Arise from the chemical and biological degradation of plant and animal residues and from the synthetic activities of microorganisms in the soil, humic substances (HS) are natural heterogeneous aromatic and organic compounds. These substances are chemically complex with no clearly defined chemical structure, although generalized models have been proposed and they can be divided into fractions of humic acids, fulvic acids and humins depending on their solubility in water as a function of the pH. The stimulation of plant growth and development by HS are the activities that have attracted the attention of many scientists. They influence plant productivity directly by the stimulation of biochemical and metabolic processes or indirectly through the modification of soil characteristics and microflora activities. All together, these properties mainly affect root architecture. By inducing root hairs proliferation, differentiating root cells and enhancing lateral root emergence, an increase of the total root biomass is observed. Experiments targeting the rooting stages in absence of interferences were conducted in vitro using HS extracted from landfill leachate and a stable commercial formulation (“Humifirst” from TRADECORP company: 12% humic acid and fulvic acid 3%) issued from leonardite. Shoots and leaves explants of silver birch (Betula pendula Roth) and black alder (Alnus glutinosa L. Gaertn) vitro-plants were treated with 10 ppm leachate HS and 100 ppm Humifirst HS for 5 days during the rooting induction/initiation phase. The treated explants were then transferred into elongation medium containing only nitrate calcium for 4 weeks. The results show that application of HS during the root induction/initiation phase did not significantly influence root growth of both species in comparison with control explants. [less ▲]

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See detailIsolation of an amylolytic chrysophyte, Poterioochromonas sp. from the digestive tract of the termite R. santonensis
Tarayre, Cédric ULg; Bauwens, Julien ULg; Brasseur, Catherine ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2014), 18(1),

The aim of this work was the isolation and cultivation of amylolytic protists living in the digestive tract of the termite Reticulitermes santonensis (Feytaud). A chrysophyte identified as ... [more ▼]

The aim of this work was the isolation and cultivation of amylolytic protists living in the digestive tract of the termite Reticulitermes santonensis (Feytaud). A chrysophyte identified as Poterioochromonas sp. was isolated in a special medium containing rice grains as a source of carbon and nitrogen. Then, the protist was grown in a medium containing starch as a carbon source, tryptone, and a phosphate buffer at different pH values (5, 6 and 7). Yeast extract was added or not. Ciprofloxacin was used to avoid the bacterial development. Other antibiotics were also tested but showed an inhibitive effect on the growth of Poterioochromonas sp. Yeast extract allowed reaching 1.9 (pH 5), 2.3 (pH 6) and 2.2 (pH 7) times higher final cell concentrations, and 2.8 (pH 5), 2.8 (pH 6) and 2.2 (pH 7) times higher biomass yields. The starch concentration did not decrease in the medium until 3 and 4 days of culture, with and without yeast extract, respectively. Eight days of culture were necessary for hydrolyzing the starch completely, with and without yeast extract. Maltose and maltotriose were detected in the culture media and were hydrolyzed progressively. Maximal maltose concentrations were 0.68, 0.66 and 0.51 g.l-1 in the medium containing yeast extract. Maltotriose concentrations were only 0.17, 0.14 and 0.12 g.l-1. Other glucose oligomers were also detected but in lower quantities. It was determined that the protist developed a weak amylase activity, particularly at a weakly acidic pH (5-6). Such a pH also allowed a better growth of the protist. A maximal amylase activity of 112 nkat.l-1 was measured with yeast extract at pH 5. No other enzymatic activity (protease, cellulase or xylanase) was detected except amylase. The degradation products of starch which were obtained by enzymatic hydrolysis allow the identification of α-amylase, amyloglucosidase and possibly β-amylase activities. [less ▲]

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See detailValorisation et propriétés des substances humiques des lixiviats de décharge
Tahiri, Abdelghani ULg; Destain, Jacqueline ULg; Thonart, Philippe ULg et al

Conference (2013, December 18)

Des expérimentations ont été menées dans notre laboratoire en utilisant des substances humiques (SH) extraites des lixiviats de cEntre d’Enfouissemnt Techique et des une formulation stable de SH « ... [more ▼]

Des expérimentations ont été menées dans notre laboratoire en utilisant des substances humiques (SH) extraites des lixiviats de cEntre d’Enfouissemnt Techique et des une formulation stable de SH « Humifirst » (12%d’acides humiques et 3% d’acides fulviques) de la compagnie TRADECORP s.a. (Espagne) commercialisée sous l’appelation Humifirst en vue d’en étudier leurs effets sur le développement du système racinaire de vitro-plants de bouleau et d’aulne. Les résultats montrent qu‘un traitement à faible concentration (10ppm) pendant la phase d’élongation des racines affecte la formation des racines latérales formée en présence de SH de lixiviat avec une intensité variable selon l’espèce testée. [less ▲]

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See detailShort communication - Isolation of amylolytic, xylanolytic, and cellulolytic microorganisms extracted from the gut of the termite Reticulitermes santonensis by means of a micro-aerobic atmosphere
Tarayre, Cédric ULg; Brognaux, Alison ULg; Bauwens, Julien ULg et al

in World Journal of Microbiology & Biotechnology (2013)

The aim of this work was to isolate enzyme-producing microorganisms from the tract of the termite Reticulitermes santonensis. The microorganisms were extracted from the guts and anaerobic (CO2 or CO2/H2 ... [more ▼]

The aim of this work was to isolate enzyme-producing microorganisms from the tract of the termite Reticulitermes santonensis. The microorganisms were extracted from the guts and anaerobic (CO2 or CO2/H2) and micro-aerobic atmospheres were used to stimulate growth. Three different strategies were tried out. First, the sample was spread on Petri dishes containing solid media with carboxymethylcellulose, microcrystalline cellulose or cellobiose. This technique allowed us to isolate two bacteria: Streptomyces sp. strain ABGxAviA1 and Pseudomonas sp. strain ABGxCellA. The second strategy consisted in inoculating a specific liquid medium containing carboxymethylcellulose, microcrystalline cellulose, or cellobiose. The samples were then spread on Petri dishes with the same specific medium containing carboxymethylcellulose, microcrystalline cellulose, or cellobiose. This led to the isolation of the mold Aspergillus sp. strain ABGxAviA2. Finally, the third strategy consisted in heating the first culture and spreading samples on agar plates containing rich medium. This led to the isolation of the bacterium Bacills subtilis strain ABGx. All those steps were achieved in controlled atmospheres. The four enzyme-producing strains which were isolated were obtained by using a micro-aerobic atmosphere. Later, enzymatic assays were performed on the four strains. Streptomyces sp. strain ABGxAviA1 was found to produce only amylase, while Pseudomonas sp. strain ABGxCellA was found to produce β-glucosidase as well. Aspergillus sp. strain ABGxAviA2 showed β-glucosidase, amylase, cellulase, and xylanase activities. Finally, Bacillus subtilis strain ABGx produced xylanase and amylase. [less ▲]

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See detailPrésentation des projets Interreg IVB BIOREFINE et RENEW
Tarayre, Cédric ULg; Delvigne, Frank ULg; Destain, Jacqueline ULg et al

Conference (2013, October 22)

Les projets BioRefine et Renew sont financés par le programme de coopération européen Interreg IVB. Leur but est de promouvoir les transferts de compétences, d'informations et de matières entre les ... [more ▼]

Les projets BioRefine et Renew sont financés par le programme de coopération européen Interreg IVB. Leur but est de promouvoir les transferts de compétences, d'informations et de matières entre les différents pays de la zone européenne du Nord-Ouest. Le projet BioRefine a pour but de récupérer les nutriments (N, P et K) ainsi que les éléments traces métalliques à partir de déchets bien spécifiques: le fumier, le lisier, les digestats de méthanisation et les boues de stations d'épuration. Cette récupération requiert l'élaboration de procédés industriels mis en place après une étude en laboratoire. Le projet Renew, lui, est beaucoup plus général. En ce qui concerne le rôle de Gembloux Agro-Bio Tech dans le projet, le travail sera essentiellement focalisé sur la production d'acide succinique à partir de déchets. Cette production sera assurée par la souche bactérienne Actinobacillus succinogenes. [less ▲]

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See detailProjet Termitofuel: les termites et leurs symbiontes pour mieux valoriser la biomasse ligno-cellulosique
Bauwens, Julien ULg; Tarayre, Cédric ULg; Brasseur, Catherine ULg et al

Poster (2013, October 19)

L’exploitation actuelle de la biomasse ligno-cellulosique, extrêmement abondante sur Terre, est liée à la production de déchets relativement peu valorisables. C’est pourquoi le projet TERMITOFUEL étudie ... [more ▼]

L’exploitation actuelle de la biomasse ligno-cellulosique, extrêmement abondante sur Terre, est liée à la production de déchets relativement peu valorisables. C’est pourquoi le projet TERMITOFUEL étudie la digestion du bois chez les termites, grâce à une approche pluridisciplinaire, en vue d’améliorer la production de bioéthanol de seconde génération. Au sein de l’Unité d’Entomologie Fonctionnelle et Evolutive, l’approche protéomique est employée afin d’identifier les micro-organismes présents dans le tube digestif des termites et caractériser les activités enzymatiques. [less ▲]

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