References of "Fauconnier, Marie-Laure"
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See detailComparative study of nutritional quality of potato-wheat steamed and baked breads made with four cultivated potato flour
Liu, Xingli; Mu, Tai-Hua; Sun, Hongnan et al

in International Journal of Food Sciences & Nutrition (in press)

Bread is traditional staple food in western and oriental countries varying in both the ingredients used, preparation methods, and heating methods applied, which are mainly used as an energy source because ... [more ▼]

Bread is traditional staple food in western and oriental countries varying in both the ingredients used, preparation methods, and heating methods applied, which are mainly used as an energy source because of high carbohydrate. Baked bread is popular in western countries. While steamed bread is a type of fermented and steamed wheat-based food of Chinese origin, and represents ∼40% of the wheat consumption in China. [less ▲]

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See detailGrasshoppers as a food source? A review
Paul, Aman ULg; Frederich, Michel ULg; Uyttenbroeck, Roel ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment (in press), 20(AgricultureIsLife),

Description of the subject. Current trends suggest an increasing future demand for conventional meats, which indicates a strong need to shift this dependency to other alternative protein sources such as ... [more ▼]

Description of the subject. Current trends suggest an increasing future demand for conventional meats, which indicates a strong need to shift this dependency to other alternative protein sources such as insects. Literature. From a nutritional point of view, of all the insects consumed globally, grasshoppers are particularly important as a human food. Data from the literature regarding the nutrient composition, amino acid profile, fatty acid profile, mineral composition and vitamin content of grasshoppers as reviewed in this paper, suggest that a number of grasshopper species are a good source of nutrients. It also highlights some of the health related aspects that might arise from the consumption of grasshoppers, mostly linked to agricultural practices and the allergic response of sensitive individuals. The paper also summarizes some religious, social and economic factors that are associated with grasshopper consumption. Conclusions. The success of introducing grasshoppers as a novel food in western countries depends on changes in consumer attitudes. It would be interesting to develop food products derived from grasshoppers in a form acceptable to consumers. Furthermore, it is important to explore the food potential of some grasshopper species native to western countries and to develop their rearing methodologies to enhance availability. [less ▲]

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See detailInvestigating the effect of plant-derived amendments on PAHs degradation in brownfield contaminated soils
Davin, Marie ULg; Starren, Amandine ULg; Colinet, Gilles ULg et al

Conference (2016, September 13)

Polycyclic aromatic hydrocarbons (PAHs) are a class of persistant organic compounds of major concern that tend to accumulate in the environment, damaging ecosystems and health. Brownfields represent an ... [more ▼]

Polycyclic aromatic hydrocarbons (PAHs) are a class of persistant organic compounds of major concern that tend to accumulate in the environment, damaging ecosystems and health. Brownfields represent an important tank for PAHs that require remediation. As an alternative to environmentally aggressive, expensive and often disruptive soil remediation strategies, experiences have been carried on to understand and develop techniques based on bioremediation and phytoremediation. PAHs degradation experiments were conducted in microcosms (laboratory scale) in order to determine whether several plant-derived amendments could enhance bioremediation. Briefly, samples of aged contaminated soils were treated with different concentrations of Medicago sativa or Trifolium pratense root exudates or dried roots, commercial saponin, a natural surfactant found in some plant roots such as some Fabaceae, and some samples were left unamended as controls. Soil samples were incubated for two and four weeks at controlled temperature (28°C). Carbon dioxide emission was monitored throughout the whole incubation. At the end of each experiment, dehydrogenase activity was measured as an indicator of microbiological activity and residual PAHs were determined using High-Performance Liquid Chromatography with Fluorimetric Detection (HPLC-FLD). In total, eleven amendment modalities and two incubation periods were tested and repeated four times. Preliminary experiments show promising results as amended samples seem to show different respiration activities. Ongoing studies will allow discussion as to whether or not PAHs degradation is influenced by the different modalities and if there are any differences according to the nature and concentration of the amendment. [less ▲]

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See detailInvestigating the Effect of Plant Root Exudates and of Saponin on Polycyclic Aromatic Hydrocarbons Solubilization in Brownfield Contaminated Soils
Davin, Marie ULg; Fauconnier, Marie-Laure ULg; Colinet, Gilles ULg

Conference (2016, August 08)

In Wallonia, there are 6,000 estimated brownfields (rising to over 3.5 million in Europe) that require remediation. Polycyclic Aromatic Hydrocarbons (PAHs) are a class of recalcitrant carcinogenic ... [more ▼]

In Wallonia, there are 6,000 estimated brownfields (rising to over 3.5 million in Europe) that require remediation. Polycyclic Aromatic Hydrocarbons (PAHs) are a class of recalcitrant carcinogenic/mutagenic organic compounds of major concern as they accumulate in the environment and represent 17% of all encountered pollutants. As an alternative to environmentally aggressive, expensive and often disruptive soil remediation strategies, a lot of research has been directed to developing techniques targeting organic pollutants. The following experiment, based on the observation that PAHs soil content decreases in the presence of plants, aimed at improving our understanding of the underlying mechanisms involved in phytoremediation. It focusses on plant root exudates and whether they improve PAHs solubilization, which would make them more available for bioremediation by soil microorganisms. The effect of saponin, a natural surfactant found in some plant roots such as members of the Fabaceae family, on PAHs solubilization was also investigated as part of the implementation of the experimental protocol. The experiments were conducted on soil collected from a brownfield in Saint-Ghislain (Belgium) and presenting weathered PAHs contamination. Samples of soil were extracted with different solutions containing either plant root exudates or commercial saponin. Extracted PAHs were determined in the different aqueous solutions using High-Performance Liquid Chromatography and Fluorimetric Detection (HPLC-FLD). Both root exudates of alfalfa (Medicago sativa L.) or red clover (Trifoliumpratense L.) and commercial saponin were tested in different concentrations. Distilled water was used as a control. First of all, results show that PAHs are more extracted using saponin solutions than distilled water and that the amounts generally rise with the saponin concentration. However, the amount of each extracted compound diminishes as its molecular weight rises. Also, it appears that passed a certain surfactant concentration, PAHs are less extracted. This suggests that saponin might be investigated as a washing agent in polluted soil remediation techniques, either for ex situ or in situ treatments, as an alternative to synthetic surfactants. On the other hand, preliminary results on experiments using plant root exudates also show differences in PAHs solubilization compared to the control solution. Further results will allow discussion as to whether or not there are differences according to the exudates provenance and concentrations. [less ▲]

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See detailGamifier un quiz – Effet graduel sur la performance, l’immersion et la perception de compétence
le Maire, Nathalie ULg; Fauconnier, Marie-Laure ULg; Colaux, Catherine ULg et al

Conference (2016, July 06)

Dans un contexte marqué par l’arrivée d’une génération pour laquelle les technologies, les réseaux sociaux et les jeux en ligne relèvent de l’évidence (Stein, 2013; Weiler, 2004), le jeu a souvent été ... [more ▼]

Dans un contexte marqué par l’arrivée d’une génération pour laquelle les technologies, les réseaux sociaux et les jeux en ligne relèvent de l’évidence (Stein, 2013; Weiler, 2004), le jeu a souvent été qualifié de véhicule d’une pédagogie rendant l’étudiant acteur de son apprentissage, conférant une dimension de défi aux activités éducatives et générant une motivation intrinsèque (Foster, 2008; Kang & Tan, 2008; McFarlane et al., 2002; Mitchell & Savill-Smith, 2004; Papastergiou, 2009). Ce potentiel éducatif du jeu a cependant été souvent associé à des jeux immersifs (de Freitas, 2006) requérant la mise en œuvre d’une trame narrative et dont le développement peut s’avérer couteux. L’utilisation de mini-jeux est considérée comme une solution alternative à ces « serious games » complexes car ils permettent d’enseigner un grand nombre de concepts tout en générant de faibles coûts de développement (Illanas, Gallego, Satorre, & Llorens, 2008). Ceux-ci présentent des règles basiques, sont faciles à jouer et conçus comme objets d’apprentissage de sorte qu’il soit aisé pour l’étudiant de percevoir les informations essentielles et que leur pratique soit bénéfique pour l’apprentissage (Frazer, Argles, & Wills, 2007). La gamification, à savoir la transposition des principes issus de l’univers du jeu au domaine de l’éducation (Deterding, Dixon, Khaled, & Nacke, 2011), ne porte donc pas ici sur des jeux de simulation immersifs mais vise plus réalistement la transposition à des activités d’apprentissage d’un certain nombre de principes et de leviers à l’œuvre dans des mini-jeux populaires tel que Candy Crush. La question de recherche qui a guidé l’expérience décrite ci-après concerne l’évaluation du potentiel pédagogique de l’utilisation d’un mini-jeu de ce type dans un cours de chimie générale en complément des supports pédagogiques plus classiquement utilisés en première année d’université. Concrètement, ce mini-jeu appelé « Atomica » se présente comme un quiz d’entrainement portant sur un chapitre réputé difficile du cours, l’atomistique. Ce quiz a fait l’objet de quatre versions activant chacune un nombre croissant d’éléments de gamification (indiqués en gras) décrits par plusieurs auteurs comme étant les « ingrédients » ou « building blocks » d’un bon jeu (Bunchball Inc., 2010; Dignan, 2011; Reeves & Read, 2013) : - La version contrôle du QCM se présente comme similaire aux évaluations formatives couramment utilisées à l’université ; - La version 1 segmente le QCM en six niveaux de difficulté ; - La version 2 ajoute un feedback automatisé aux niveaux de difficulté ; - La version 3 présente une version maximaliste de la gamification puisque, aux éléments précédents, elle ajoute un compte à rebours, des indices dont l’appel engendre une perte de points, un classement des meilleurs joueurs et un indicateur social (possibilité de se situer par rapport à la communauté de joueurs). Ce choix d’un dispositif graduel se justifie notamment par l’intérêt pour la détection d’un seuil à partir duquel l’ajout d’éléments de gamification fait basculer la perception d’un quiz habituel vers un artefact relevant du mini-jeu et générant ainsi un état de flow chez le joueur. Chaque version a été soumise à un groupe d’une trentaine d’étudiants, selon une procédure expérimentale contrôlée, avec pour objectif la collecte de données (en cours) sur : - L’état de flow ou expérience optimale engendré par chacune des versions (orientation comparative) défini comme un état subjectif de bien-être (Csikszentmihalyi, 1990) engendrant une immersion totale dans l’activité. Afin de mesurer le flow, une échelle spécifique aux jeux éducatifs (EGameFlow) développée en 2009 (Fu, Su, & Yu, 2009) a été utilisée dans le cadre de cette étude. - Une des trois composantes du modèle de la dynamique motivationnelle de Viau, la perception du sentiment de compétence (Bandura, 1993; Pajares, 2014) considéré comme un moteur essentiel à l’apprentissage et un déterminant de l’intérêt pour une discipline scolaire. - La performance à un test de connaissance soumis aux étudiants avant et après l’expérience de jeu. Les motivations sous-tendant le processus d’exploration des mini-jeux sont à chercher du côté d’un certain discours pédagogique qui prône l’inscription d’une dimension ludique dans les apprentissages en enseignement supérieur. Nourrie par ses résultats expérimentaux, la communication proposera un retour réflexif plus général sur la valeur, les limitations et les conditions de réalisation de ce discours. [less ▲]

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See detailCaractérisation des mécanismes impliqués dans la perception de rhamnolipides naturels et synthétiques chez Arabidopsis thaliana
Luzuriaga Loaiza, Walter ULg; Schellenberger, Romain; Obounou Akong, Firmin et al

Scientific conference (2016, July 05)

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See detailScreening of mahoran plants for cosmetic applications.
Saive, Matthew ULg; Frederich, Michel ULg; Fauconnier, Marie-Laure ULg

Poster (2016, June 01)

This study’s main aim is to identify plant species showing anti-oxidant, anti-inflammatory and skin whitening properties. A selection of 89 samples from previous infield studies on the traditional uses of ... [more ▼]

This study’s main aim is to identify plant species showing anti-oxidant, anti-inflammatory and skin whitening properties. A selection of 89 samples from previous infield studies on the traditional uses of plants in Mayotte were analyzed. The anti-oxidant activity was assessed using the α, α-diphenyl-β-picrylhydrazyl (DPPH) method developed by Blois [1]. The anti-inflammatory activity and the skin whitening activity were both assessed through the study of inhibition kinetics from specific enzymes: respectively, lipoxygenase (EC 1.13.11.12) due to its important role in the leukotriene pathway and tyrosinase (EC. 1.14.18.1) as it takes part in the melanogenesis pathway. The IC 50 value for each sample and for each activity was obtained using UV/Vis spectrophotometric technics. These IC 50 were then compared with the ones obtained from known molecules found in the literature: namely, (±)-6-Hydroxy-2,5,7,8-tetramethylchromane-2-carboxylic acid (IC50 = 4,388 µM) for the anti-oxidant activity, nordihydroguaiaretic acid (IC50 = 3,5µM) for the anti-inflammatory activity and kojic acid (IC50 = 722 µM) for the anti-tyrosinase activity. The most effective anti-oxidant activity was observed in fresh leaves from Acalypha wilkesiana Müll.Arg. (IC50 = 0,381 g/L) and Leea guineensis G. Don. (IC50 = 0,225 g/L) as well as in dried roots from Litchi chinensis Sonn. (IC50 = 0,346 g/L). All results are expressed in grams of fresh matter. According to the preliminary tests for the-anti-inflammatory and skin whitening activities, the crude extracts from Kalanchoe pinnata Lam. Pers., Litchi chinensis Sonn., Zingiber zerumbet (L.) Sm., Leea guineensis G. Don. and Paullinia pinnata L. are likely to show promising activities. [less ▲]

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See detailDisentangling soil from plant methanol exchanges in a maize field: a first step
Bachy, Aurélie ULg; Mozaffar, Ahsan ULg; Aubinet, Marc ULg et al

Poster (2016, June)

This poster presents the current research done in order to disentangle soil from plant methanol exchanges in a maize field. Methanol exchanges were calculated at ecosystem-scale (therefore including both ... [more ▼]

This poster presents the current research done in order to disentangle soil from plant methanol exchanges in a maize field. Methanol exchanges were calculated at ecosystem-scale (therefore including both components). It bases on the following observation: methanol exchanges on bare soil (measured when maize was at germination stage) were as important as when plants were fast growing (and thereby, when the highest methanol plant methanol emissions were expected), and this under similar weather conditions. The goal of this poster is thus to understand why emissions were similar at these two periods. First, it addresses the question of the actual contribution of maize plants in methanol exchanges, by comparing up-scaled methanol exchanges measured on maize at leaf-scale (Mozaffar A.) to those measured at ecosystem-scale. Then, it investigates methanol exchanges mechanisms in order to evaluate how did soil methanol emissions evolve along the maize growing season. At the end of this poster, the hypothesis of decreasing soil methanol emissions along the maize growing season is proposed. [less ▲]

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See detailDes mini-jeux pour apprendre - Retour d'expérience dans un cours de chimie à l'université
le Maire, Nathalie ULg; Colaux, Catherine ULg; Fauconnier, Marie-Laure ULg et al

Conference (2016, June)

Dans le champ éducatif, les jeux ont régulièrement fait l’objet de réflexions et d’expérimentations visant à en exploiter leur potentiel au service de la compréhension, la motivation, la créativité ... [more ▼]

Dans le champ éducatif, les jeux ont régulièrement fait l’objet de réflexions et d’expérimentations visant à en exploiter leur potentiel au service de la compréhension, la motivation, la créativité, l’esprit critique etc. des étudiants. De la tortue LOGO aux jeux de simulation, l’exploitation du jeu dans l’enseignement a revêtu de multiples formes. Récemment la notion de gamification a enrichi cette ligne de recherche sur le jeu. Le concept de « gamification » désigne l’application d’éléments, de mécanismes, de processus ludiques à des situations, des contextes, des visées non ludiques. En la matière, Candy Crush, Farm Ville, Clash of Clans, etc. sont autant de jeux commerciaux qui remportent un grand succès aujourd’hui et peuvent fournir une source d’inspiration pour la création de mini-jeux pédagogiques. La présente communication relate la mise en place de « World of Chemistry », un parcours ludique mis en place de septembre à décembre 2015 en complément des supports de cours traditionnels. Ce parcours était composé de quatre mini-jeux portant sur des savoirs et des compétences identifiés comme difficiles en chimie et conçus explicitement pour incorporer des éléments de gamification issus de mini-jeux commerciaux variés. Cette expérimentation avait pour objectif d’étudier dans quelle mesure et à quelles conditions ces mini-jeux étaient susceptibles d’augmenter la fréquentation de la matière de chimie par les étudiants. A la lumière de l’usage fait des mini-jeux par 159 étudiants de première année d’université et de questionnaires de feedback qui leur ont été adressés, la communication évaluera la valeur de cette initiative pédagogique. [less ▲]

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See detailTaupins: à la découverte des odeurs de racines
Barsics, Fanny ULg; Delory, Benjamin; Fauconnier, Marie-Laure ULg et al

in Phytoma : La Défense des Végétaux (2016), 694

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See detailCharacterization of monovarietal virgin olive oils from introduced cultivars in eastern Morocco
Mansouri, Farid ULg; Benmoumen, A.; Richard, Gaetan ULg et al

in Rivista Italiana Sostanze Grasse (2016), 93

The aim of this study was to characterize monovarietal virgin olive oils (VOOs) of new high-density planting system of three European cultivars (Arbequina, Arbosana and Koroneiki), recently introduced in ... [more ▼]

The aim of this study was to characterize monovarietal virgin olive oils (VOOs) of new high-density planting system of three European cultivars (Arbequina, Arbosana and Koroneiki), recently introduced in eastern Morocco. VOOs’ characterization has been carried out by analyzing several parameters, such as quality indexes, fatty acid contents, minor components, and olive oils’ oxidative stability index (OSI). In this study, we have also conducted a comparison between these monovarietal VOOs and olive oils of autochthones cultivar Picholine marocaine. Significant differences between the analyzed VOOs were highlighted. Koroneiki’s VOO had a high phenols content (493.66 mg/kg) and, consequently, the best oxidative stability (94.83 h); Arbrosana’s VOO was distinguished by its abundance of α-tocopherol (460.07 mg/kg) and by an intermediate OSI (64.83 h). In addition, results showed, firstly, that in all the analyzed oils decarboxymethyl ligstroside aglycone and decarboxymethyl oleuropein aglycone were the main phenolic compounds, and, secondly, that VOOs of Koroneiki and Arbosana seem to have similar profiles, with a high content of natural antioxidants and a high oleic/linoleic ratio, thus boasting a better shelf life. [less ▲]

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See detailForaging wireworms are attracted to root-produced volatile aldehydes
Barsics, Fanny ULg; Delory, Benjamin M.; Delaplace, Pierre ULg et al

in Journal of Pest Science (2016)

Soil-dwelling insects are known to react to chemical cues they encounter in the rhizosphere. Whether wireworms (Coleoptera, Elateridae) use root-emitted volatile organic chemicals to localize their host ... [more ▼]

Soil-dwelling insects are known to react to chemical cues they encounter in the rhizosphere. Whether wireworms (Coleoptera, Elateridae) use root-emitted volatile organic chemicals to localize their host plant remains, however, poorly understood. Here, we aimed at identifying chemical cues released by barley roots that attract Agriotes sordidus. In a first behavioral experiment, we assessed the ability of wireworms to orient towards live barley roots, using dual-choice olfactometers suitable for belowground insects. Then, we collected the volatile organic compounds (VOC) produced by barley roots using a dynamic head-space sampling approach. VOC were quantified and identified using gas chromatography—mass spectrometry (GC–MS). The odorant blend is composed of four aldehydes, namely hexanal, (E)-hex-2-enal, (E)-non-2-enal, and (E,Z)-nona-2,6-dienal. In a second set of dual-choice bioassays, wireworms were attracted towards a synthetic blend of these four major compounds. However, the synthetic blend was not as attractive as live roots, which is partially explained by the absence of CO2, commonly known as a strong attractant for soil-dwelling insects. While CO2 indicates the presence of living material in the vicinity, we hypothesize that additional VOC inform about the plant suitability. A better understanding of these belowground signals would contribute to the development of new integrated control strategies against wireworms. [less ▲]

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See detailVolatile Organic Compounds:a new tool to control barley pathogens?
Kaddes, Amine ULg; Massart, Sébastien ULg; Fauconnier, Marie-Laure ULg et al

Poster (2016, February 05)

Barley is threatened by various edaphic fungal diseases. In particular, common root rot caused by Fusarium culmorum and Cochliobolus sativus is causing between 9 and 23 % of yield losses. Today, since ... [more ▼]

Barley is threatened by various edaphic fungal diseases. In particular, common root rot caused by Fusarium culmorum and Cochliobolus sativus is causing between 9 and 23 % of yield losses. Today, since most of the chemicals used for crop protection are being forbidden, there is a growing need of sustainable ways to control these diseases. A recent study has shown that barley roots infected by common root rot emitted 23 Volatile Organic Compounds (VOCs) that were not emitted by healthy barley roots. In addition it was shown that the blend of these molecules negatively impacted the growth of the two fungi. The main objective of the present study was to determine which VOCs of the blend were the most efficient in this growth reduction, and to understand their mode of action. We have found that methyl propionate (MP) and methyl acrylate (MA) reduced significantly the development of the two fungi in vitro. We also observed an inhibition of the spores’ germination in the presence of the two esters. The effect of the two molecules on infected barley seeds was also tested. We have observed that the plants coming from the seeds in contact with the VOCs did not develop symptoms of the disease. The antifungal and antibacterial activity of these VOCs on a wider range of fungal and bacterial diseases was also tested in vitro with success The two esters that we have studied could thus be an interesting starting point in the development of a sustainable way to control barley’s diseases. [less ▲]

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