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See detailFlapping around in a wind tunnel
Dimitriadis, Grigorios ULg

Conference (2015, March 17)

Aerodynamic investigations of animal flight have usually concentrated on static conditions. These are good enough to analyse gliding flight but not other types of flight, such as cruise (migrations), take ... [more ▼]

Aerodynamic investigations of animal flight have usually concentrated on static conditions. These are good enough to analyse gliding flight but not other types of flight, such as cruise (migrations), take-off and landing or manoeuvres. In this work we present wind tunnel experiments on geese flying in a wind tunnel and unsteady aerodynamic simulations of these flights, based on the Vortex Lattice Method. [less ▲]

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See detailLoss of Snail2 favors skin tumor progression by promoting the recruitment of myeloid progenitors
Villarejo, Ana; Molina Ortiz, Patricia ULg; Montenegro, Yenny et al

in Carcinogenesis (2015), 36(5), 585-597

Snail2 is a zinc finger transcription factor involved in driving epithelial to mesenchymal transitions. Snail2 null mice are viable, but display defects in melanogenesis, gametogenesis and hematopoiesis ... [more ▼]

Snail2 is a zinc finger transcription factor involved in driving epithelial to mesenchymal transitions. Snail2 null mice are viable, but display defects in melanogenesis, gametogenesis and hematopoiesis, and are markedly radiosensitive. Here, using mouse genetics, we have studied the contributions of Snail2 to epidermal homeostasis and skin carcinogenesis. Snail2 −/− mice presented a defective epidermal terminal differentiation and, unexpectedly, an increase in number, size and malignancy of tumor lesions when subjected to the two-stage mouse skin chemical carcinogenesis protocol, compared with controls. Additionally, tumor lesions from Snail2 −/− mice presented a high inflammatory component with an elevated percentage of myeloid precursors in tumor lesions that was further increased in the presence of the anti-inflammatory agent dexamethasone. In vitro studies in Snail2 null keratinocytes showed that loss of Snail2 leads to a decrease in proliferation indicating a non-cell autonomous role for Snail2 in the skin carcinogenic response observed in vivo. Bone marrow (BM) cross-reconstitution assays between Snail2 wild-type and null mice showed that Snail2 absence in the hematopoietic system fully reproduces the tumor behavior of the Snail2 null mice and triggers the accumulation of myeloid precursors in the BM, blood and tumor lesions. These results indicate a new role for Snail2 in preventing myeloid precursors recruitment impairing skin chemical carcinogenesis progression. [less ▲]

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See detailEffets de l'hydrolyse enzymatique sur propriétés fonctionnelles et conformationnelles des isolats proteiques de pois chiches
Mokni Ghribi, Abir; Maklouf Gafsi, Ines; Sila, Assaad et al

Conference (2015, March 16)

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See detailL'innovation dans la filière céréalière: agir à différents étages
Roiseux, Olivier; Vanderbeke, Erik; Blecker, Christophe ULg

Scientific conference (2015, March 16)

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See detailLes MOOCs ne sont (déjà) plus ce qu'ils étaient...
Verpoorten, Dominique ULg

Article for general public (2015)

Comment évoluent les MOOCs (Massive Open Online Courses), ce nouveau format de cours à distance, parfois qualifié de révolution pour l’enseignement supérieur ? Impressions d’un participant assidu.

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See detailTrends of ozone total columns and vertical distribution from FTIR observations at eight NDACC stations around the globe
Vigouroux, C; Blumenstock, T; Coffey, M et al

in Atmospheric Chemistry and Physics (2015), 15

Ground-based Fourier transform infrared (FTIR) measurements of solar absorption spectra can provide ozone total columns with a precision of 2 % but also independent partial column amounts in about four ... [more ▼]

Ground-based Fourier transform infrared (FTIR) measurements of solar absorption spectra can provide ozone total columns with a precision of 2 % but also independent partial column amounts in about four vertical layers, one in the troposphere and three in the stratosphere up to about 45 km, with a precision of 5–6 %. We use eight of the Network for the Detection of Atmospheric Composition Change (NDACC) stations having a long-term time series of FTIR ozone measurements to study the total and vertical ozone trends and variability, namely, Ny-Ålesund (79ºN), Thule (77ºN), Kiruna (68ºN), Harestua (60ºN), Jungfraujoch (47ºN), Izaña (28ºN), Wollongong (34ºS) and Lauder (45ºS). The length of the FTIR time series varies by station but is typically from about 1995 to present. We applied to the monthly means of the ozone total and four partial columns a stepwise multiple regression model including the following proxies: solar cycle, quasi-biennial oscillation (QBO), El Niño–Southern Oscillation (ENSO), Arctic and Antarctic Oscillation (AO/AAO), tropopause pressure (TP), equivalent latitude (EL), Eliassen–Palm flux (EPF), and volume of polar stratospheric clouds (VPSC). At the Arctic stations, the trends are found mostly negative in the troposphere and lower stratosphere, very mixed in the middle stratosphere, positive in the upper stratosphere due to a large increase in the 1995–2003 period, and non-significant when considering the total columns. The trends for mid-latitude and subtropical stations are all non-significant, except at Lauder in the troposphere and upper stratosphere and at Wollongong for the total columns and the lower and middle stratospheric columns where they are found positive. At Jungfraujoch, the upper stratospheric trend is close to significance (+0.9 ± 1.0 %/decade). Therefore, some signs of the onset of ozone mid-latitude recovery are observed only in the Southern Hemisphere, while a few more years seem to be needed to observe it at the northern mid-latitude station. [less ▲]

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See detailSe construire politiquement dans un monde en crise
Grandjean, Geoffrey ULg

Conference given outside the academic context (2015)

L’objectif de la conférence est d’intervenir sur la manière dont les jeunes peuvent se développer politiquement en optant pour une approche de socialisation politique. Plus précisément, les jeunes ... [more ▼]

L’objectif de la conférence est d’intervenir sur la manière dont les jeunes peuvent se développer politiquement en optant pour une approche de socialisation politique. Plus précisément, les jeunes (enfants et adolescents) évoluent maintenant dans un monde en crise (politique, sociale et économique). Ces crises peuvent façonner leurs représentations et perceptions du système politique dans lequel ils vivent. L’intervention visera à fournir, à partir d’exemples concrets, différentes réflexions permettant d’envisager la construction politique des jeunes à partir de leurs expériences quotidiennes. Cette conférence est également une occasion d’échanger avec les personnes présentes, dont la Communauté éducative. Une place importante est donc laissée aux débats et aux discussions. [less ▲]

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See detail7 interventions dans la presse écrite et radio au sujet des Moocs, du 22 mai 2013 jusqu'au 16 mars 2015
Verpoorten, Dominique ULg

Diverse speeche and writing (2015)

Ces interventions témoignent du suivi attentif et critique des initiatives en matière de moocs.

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See detailStofftransport an Einzeltropfen mit Konzentrationsprofil in der kontinuierlichen Phase
Cvetkovic, E; Pfennig, Andreas ULg

Conference (2015, March 16)

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See detailBioassessment of trace element contamination of Mediterranean coastal waters using the seagrass Posidonia oceanica
Richir, Jonathan ULg; Salivas-Decaux, Maÿlis; Lafabrie, Céline et al

in Journal of Environmental Management (2015), 150

A large scale survey of the trace element (TE) contamination of Mediterranean coastal waters was performed from the analysis of Ag, As, Cd, Cu, Hg, Ni and Pb in the bioindicator Posidonia oceanica ... [more ▼]

A large scale survey of the trace element (TE) contamination of Mediterranean coastal waters was performed from the analysis of Ag, As, Cd, Cu, Hg, Ni and Pb in the bioindicator Posidonia oceanica, sampled at 110 sites differing by their levels of exposure to contaminants. The holistic approach developed in this study, based on the combined utilization of several complementary monitoring tools, i.e. water quality scale, pollution index and spatial analysis, accurately assessed the TE contamination rate of Mediterranean coastal waters. In particular, the mapping of the TE contamination according to a new proposed 5-level water quality scale precisely outlined the contamination severity along Mediterranean coasts and facilitated interregional comparisons. Finally, the reliability of the use of P. oceanica as bioindicator species was again demonstrated through several global, regional and local detailed case studies. NB: The designations employed and the presentation of the information in thisdocument do not imply the expression of any opinion whatsoever on the part of the authors concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. [less ▲]

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See detailGouvernance socio technique des déchets hautement radioactifs et/ou de longue durée de vie. Retours sur les cas belge et français
Parotte, Céline ULg

Learning material (2015)

Cette présentation avait pour but d'illustrer aux étudiants STS une recherche concrète en la matière. Au travers d'un cas d'étude spécifique (ici la question de la gestion des déchets hautement ... [more ▼]

Cette présentation avait pour but d'illustrer aux étudiants STS une recherche concrète en la matière. Au travers d'un cas d'étude spécifique (ici la question de la gestion des déchets hautement radioactifs et/ou de longue durée de vie) identifier la place du chercheur STS, ses pratiques empiriques et ses résultats. [less ▲]

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See detailEtude morphologique de l'effet de l'irradiation gamma sur les amidons de blé, de maïs et de pomme de terre
Atrous, Hager; Ben Bettaïeb, Nasreddine; Danthine, Sabine ULg et al

Poster (2015, March 15)

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See detailDéveloppement d'un modèle mathématique d'identification des différents tissus externes de son de blé dur et tendre (Triticum durum et Triticum aestivum) basé sur l'étude histologique macroscopique et microscopique et la composition biochimique des fractions
Ben Amouda, Mohamed Salah; Roiseux, Olivier; Olive, Gilles et al

Poster (2015, March 15)

Le blé est constitué de trois régions : l’albumen, les enveloppes et le germe. Le blé sert depuis longtemps de nourriture de base à l’homme pour donner, après mouture, à la farine dans le cas des blés ... [more ▼]

Le blé est constitué de trois régions : l’albumen, les enveloppes et le germe. Le blé sert depuis longtemps de nourriture de base à l’homme pour donner, après mouture, à la farine dans le cas des blés tendres, ou à la semoule dans le cas des blés durs. Le produit obtenu correspond à la majorité de l’albumen. Le son de blé est quant à lui un coproduit de cette transformation. C’est un empilement de différents tissus : péricarpe externe et interne, testa, épiderme et aleurone. Actuellement, la valorisation du son de blé reste faible malgré son potentiel nutritionnel. Or ce potentiel permettrait un développement d’additifs alimentaires à haute valeur ajoutée si un fractionnement correct suivi d’une analyse histochimique complète des factions obtenues pouvait être réalisés. Parmi les méthodes de fractionnement, note choix s’est porté sur le debranning qui se base sur le retrait séquentiel des différentes couches extérieures du blé (voir la communication « Mise au point du fractionnement par debranning des tissus périphériques du blé tendre (Triticum aestivum) et du blé dur (Triticum durum) ». Afin de quantifier l’efficacité du fractionnement, l’investigation de la répartition des tissus au sein des fractions produites a été réalisée par l’étude macroscopique (visuelle) et microscopique (coloration histologique spécifique) des grains et des fractions. Un modèle mathématique qui permet l’appréciation de la distribution des couches dans les différentes fractions a également été développé sur base des bio-marqueurs et de la composition biochimique des fractions. L’étude visuelle macroscopique montre que les grains dans tous les cas attaqués de façon hétérogène et ce en raison de la géométrie particulière des grains de blé. L’étude histologique microscopique montre que, malgré cela, certaines fractions sont enrichies en tissus particuliers. Donc, quelque soit la variété étudiée, les fractions obtenues par debranning présenteront toujours une hétérogénéité de composition tissulaire. Après étude du profil nutritionnel (analyse composition chimique), la variété Karim semble la plus intéressante, car elle est riche en protéines, lipides et minéraux. Au niveau des fractions, pour toutes les variétés, la fraction F1 présente le meilleur potentiel. [less ▲]

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See detailMise au point du fractionnement par debranning des tissus périphériques du blé tendre (Triticum aestivum) et du blé dur (Triticum Durum)
Roiseux, Olivier; Ben Hamouda, Mohamed Salah; Olive, Gilles et al

Poster (2015, March 15)

Le blé est constitué de trois régions : l’albumen, les enveloppes et le germe. Depuis longtemps, le blé est broyé pour donner soit la farine dans le cas des blés tendres, soit de la semoule dans le cas ... [more ▼]

Le blé est constitué de trois régions : l’albumen, les enveloppes et le germe. Depuis longtemps, le blé est broyé pour donner soit la farine dans le cas des blés tendres, soit de la semoule dans le cas des blés durs, ceci correspond en fait à la majorité de l’albumen. Le son de blé est un coproduit de cette transformation et consiste en un empilement de différents tissus : péricarpe externe et interne, testa, épiderme et aleurone. A l’heure actuelle, la valorisation du son de blé est limitée malgré son potentiel nutritionnel. Un fractionnement spécifique de ces tissus, conduisant à la production de fractions ciblées à haute valeur ajoutée, permettrait de mieux exploiter ce potentiel. Parmi les méthodes de fractionnement par voie sèche, le debranning permet le retrait séquentiel des différentes couches extérieures du blé mettant en jeu l’abrasion contre une surface abrasive et la friction des grains entre eux. L’étude a porté sur deux variétés de blé tendre (Julius et Sahara) et deux de blé dur (Karim et Razzek). En raison de différences physiques comme la dureté ou la taille et la forme des grains, des cycles de traitement adéquats pour chacun des variétés dans le but de mettre en évidence leurs différences comportementales. Les quatre fractions (F1 ; F2 ; F3 ; F4) obtenues ont alors été analysées statistiquement (moyenne, coefficient de variation, minimum et maximum, intervalles de confiance) afin de juger de la conformité de ces fractions en termes de pourcentage massique par rapport au but désiré. Les moyennes et intervalles de confiance montrent que les fractions développées sont conformes aux couches histologiques d’un point de vue massique, vis à vis des valeurs « objectifs » fixées par rapport à la littérature scientifique. [less ▲]

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See detailTECHNICAL CHALLENGES IN CHOLESTEROL REMOVAL FROM DAIRY PRODUCTS
Malik, Priyanka ULg; Danthine, Sabine ULg; Paul, Aman ULg et al

Poster (2015, March 15)

Milk is a natural complex system present as oil in water emulsion. The natural organisation of milk fat globules is stabilized by the presence of a natural membrane, called the milk fat globule membrane ... [more ▼]

Milk is a natural complex system present as oil in water emulsion. The natural organisation of milk fat globules is stabilized by the presence of a natural membrane, called the milk fat globule membrane. It has tripartite structure consisting of a monolayer facing the inner triacylglycerol core and an external bilayer. Apart from giving the nutritive value, milk fat globule membrane also contributes towards the techno-functional properties of the dairy products. The milk fat globule membrane is composed of both polar lipids and proteins. Cholesterol is also present in milk fat globule membrane and accounts for about 2% of milk fat globule membrane. Increased consumer awareness has created a perceived demand for low cholesterol products. The World Health Organization and American Heart Association has also recommended that consumers reduce their consumption of saturated fatty acids and cholesterol to lower the risk of coronary heart disease. Therefore, many researchers have developed different methods for reducing cholesterol in dairy and food products. These methods include physical process (vacuum steam distillation, short path molecular distillation and supercritical fluid extraction), biological process (cholesterol reductase and cholesterol oxidase), complexation method (adsorption with saponin, digitonin and cyclodextrin) and chemical process. Most of these methods are very efficient in process of cholesterol removal. However, most of these methods have various drawbacks for application in dairy industry like, formation of toxic oxidation products, denaturation of proteins, loss of low molecular weight triglycerides, loss of volatile components, loss of flavour compounds etc. This leads to loss of nutritive value of dairy products. Thus, the objectives of cholesterol removal from milk and milk products should be, firstly focusing on the maximum cholesterol removal, secondly maintaining the nutritional quality comparable to the control and thirdly the process of cholesterol removal should not compromise the techno functional properties of the dairy products. [less ▲]

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See detailAnhydrous Milk Fat enrichment with 13C-­triacylglycerol tracers: effects on thermal and structural behavior.
Danthine, Sabine ULg; Vors, Cécile; Blecker, Christophe ULg et al

Poster (2015, March 15)

Dietary lipids are incorporated in food products under different types of structures, e.g., as dispersed lipid droplets (in oil -in -water emulsions, like creams) or as a continuous lipid phase (in water ... [more ▼]

Dietary lipids are incorporated in food products under different types of structures, e.g., as dispersed lipid droplets (in oil -in -water emulsions, like creams) or as a continuous lipid phase (in water -in -oil emulsions, like butter for example). The crystallization, melting behavior and polymorphic stability of fats are determined by the behavior of the TAGs they contain. In clinical studies, there is a need to add some 13C TAGs as tracers to the ingested fats in order to track their metabolic fate. However, this procedure could modify the physicochemical properties of the fat. The present study was conducted in the framework of a clinical trial aiming at highlighting the effect of the physical structure of a fat (droplets in 0/W emulsion or bulk) in a meal on the absorption, chylomicron transport and further metabolic handling of dietary fatty acids (1). We therefore monitored the thermal and polymorphic behavior of anhydrous milk fat (AMF) enriched in tracers (a mixture of tripalmitin, triolein and tricaprylin; at 2 different concentrations: 1.5 and 5.7 wt%) using DSC and XRD and further compared it to the native AMF. The addition of 13C TAGs modified the AMF melting profile, especially at high concentration. The enriched AMF was completely melted at around 37°C, i.e. close to the body temperature. However, under some conditions, the AMF enriched in high 13C TAGs concentration remained crystallized at 37°C. Similar trends were observed in both systems (bulk vs emulsified). Moreover, AMF polymorphic behavior was also modified upon tracer addition. While only β’ form was observed in the native AMF, the 13 -form was detected in the AMF containing high 13C TAGs concentration. Importantly, low concentration of tracers should not have high impact on human digestive physiology. However more attention should be paid to physicochemical structure when high concentrations are added. (1) Vors et al. 2013. Modulating absorption and postprandial handling of dietary fatty acids by structuring fat in the meal: a randomized cross -over clinical trial. Am J Clin Nutr, 97(1): 23-36. [less ▲]

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See detailFood Compounds from Meadow Grasshoppers
Paul, Aman ULg; Frederich, Michel ULg; Uyttenbroeck, Roel ULg et al

Poster (2015, March 15)

Eating insects as food, particularly grasshopper is practiced in many cultures throughout the world. Meadow grasshopper (Chorthippus parallelus) is commonly found in Europe and some part of Asia. It is ... [more ▼]

Eating insects as food, particularly grasshopper is practiced in many cultures throughout the world. Meadow grasshopper (Chorthippus parallelus) is commonly found in Europe and some part of Asia. It is already known that grasshoppers of Chorthippus species are consumed as food in countries such as Thailand. With the aim of evaluating the nutritional potential of this insect species the proximate nutritional composition of grasshoppers caught from the local fields was realized. Besides this, the fatty acid profile of extracted lipids, amino acid profile and mineral composition of the insect was also revealed. Results suggest that meadow grasshopper is an excellent source of protein and essential amino acids. Lipids extracted from the grasshopper have an interesting fatty acid composition. Also the grasshopper contains some minerals that are important for body. With such protein content, amino acid profile, fatty acid profile of the lipids and mineral content this grasshopper species could present an interesting alternate to conventional protein sources. [less ▲]

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See detailThermal and structural behavior of two lauric fats compared to AMF in bulk and oil-in-water emulsion states
Petrut, Raul Flaviu ULg; Anihouvi, Prudent Placide; Blecker, Christophe ULg et al

Poster (2015, March 15)

In a previous study the thermal and polymorphic behavior of four different industrial lauric fats which are sold under the same commercial description, was compared (1). According to the findings the four ... [more ▼]

In a previous study the thermal and polymorphic behavior of four different industrial lauric fats which are sold under the same commercial description, was compared (1). According to the findings the four fats were split in two groups based on the similarities found at polymorphic level. In the present paper two of these industrial lauric fats (F1 and F2, one from each group) were incorporated into oil -in -water emulsions. The objective of this study was to point out the differences in the crystallization and polymorphic behavior between bulk and emulsified fat. Moreover anhydrous milk fat (AMF) was used in the same way for comparison. For that purpose, the fats were investigated for their thermal and polymorphic behavior by differential scanning calorimetry (DSC) and X-ray diffraction (XRD), both in bulk and emulsified state. The DSC and X -Ray investigations made possible the observation of the differences in the crystallization behavior and kinetics that occurred for those fats in the bulk and emulsified state. 1. Anihouvi, P.P., C. Blecker, A. Dombree, S. Danthine, Comparative Study of Thermal and Structural Behavior of Four Industrial Lauric Fats, Food Bioprocess Technol. 6:3381-3391 (2013) [less ▲]

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