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See detailExtraction of ferulic acid, a natural antioxidant, for potential agro-industrial applications.
Barberousse, Hélène; Roiseux, Olivier; Deroanne, Claude et al

Poster (2008, March 05)

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See detailCoating of gold nanoparticles by thermosensitive poly(N-isopropylacrylamide) end-capped by biotin
Aqil, Abdelhafid ULg; Qiu, Hongjin; Greisch, Jean-François ULg et al

in Polymer (2008), 49(5), 1145-1153

Gold nanoparticles (NPs) were prepared by reduction of HAuCl4 in aqueous solution and stabilized by poly(N-isopropylacrylamide) (PNIPAM). PNIPAM was prepared by two distinct routes: (i) conventional free ... [more ▼]

Gold nanoparticles (NPs) were prepared by reduction of HAuCl4 in aqueous solution and stabilized by poly(N-isopropylacrylamide) (PNIPAM). PNIPAM was prepared by two distinct routes: (i) conventional free-radical polymerization leading to polymer without any reactive end-group, and (ii) Reversible Addition–Fragmentation chain Transfer (RAFT) polymerization with 2-dodecylsulfanylthiocarbonylsulfanyl-2-methyl propionic acid (DMP) as a RAFT agent. PNIPAM with low polydispersity was then end-capped by an α-carboxylic acid and an ω-trithiocarbonate that was converted into an ω-thiol upon hydrolysis. This hetero-telechelic polymer was analyzed by mass spectroscopy, size exclusion chromatography (SEC) and 1H NMR. Even without thiol end-group, known for chemisorption onto gold, PNIPAM was effective in stabilizing gold NPs (1–5 nm). The thermosensitivity of PNIPAM at the surface of gold NPs was, however, dependent on the molecular weight of the chains. Finally, the α-carboxyl end-group of PNIPAM was used to anchor biotin, which is indeed known for complexation with avidin, which is a possible strategy for the coated gold NPs to be involved as building blocks in supramolecular assemblies. TEM and UV–vis spectroscopy were used to characterize the gold nanoparticles. [less ▲]

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See detailPatrocles: a database of polymorphic miRNA-mediated gene regulation
Hiard, Samuel ULg; Baurain, Denis ULg; Coppieters, Wouter ULg et al

Conference (2008, March 03)

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See detailGenetic variability of fatty acids in bovine milk
Soyeurt, Hélène ULg; Gengler, Nicolas ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2008), 12(2), 203-210

Fatty acids composition of bovine milk influences the technological properties of butterfat and also presents some potential benefits for human health. Impact of feeding on fat composition is well ... [more ▼]

Fatty acids composition of bovine milk influences the technological properties of butterfat and also presents some potential benefits for human health. Impact of feeding on fat composition is well described in the literature; less information is available about the impact of genetics. Based on few studies, essentially conducted to isolate some feeding effect, the breed seemed to influence the fatty acids composition. The variation in the activity of δ-9 desaturase, key enzyme in the production of monounsaturated fatty acids and conjugated linoleic acids in milk, could explain these differences. Very few studies have been focussing on the estimation of genetic parameters of fatty acids composition. However, the moderate heritability estimates observed by these studies for the major fatty acids could suggest a potential genetic effect. [less ▲]

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See detailOn the observability of resonant structures in planetesimal disks due to planetary migration
Reche, R.; Beust, H.; Augereau, J.-C. et al

in Astronomy and Astrophysics (2008), 480

Context: The observed clumpy structures in debris disks are commonly interpreted as particles trapped in mean-motion resonances with an unseen exo-planet. Populating the resonances requires a migrating ... [more ▼]

Context: The observed clumpy structures in debris disks are commonly interpreted as particles trapped in mean-motion resonances with an unseen exo-planet. Populating the resonances requires a migrating process of either the particles (spiraling inward due to drag forces) or the planet (moving outward). Because the drag time-scale in resolved debris disks is generally long compared to the collisional time-scale, the planet migration scenario might be more likely, but this model has so far only been investigated for planets on circular orbits. Aims: We present a thorough study of the impact of a migrating planet on a planetesimal disk, by exploring a broad range of masses and eccentricities for the planet. We discuss the sensitivity of the structures generated in debris disks to the basic planet parameters. Methods: We perform many N-body numerical simulations, using the symplectic integrator SWIFT, taking into account the gravitational influence of the star and the planet on massless test particles. A constant migration rate is assumed for the planet. Results: The effect of planetary migration on the trapping of particles in mean motion resonances is found to be very sensitive to the initial eccentricity of the planet and of the planetesimals. A planetary eccentricity as low as 0.05 is enough to smear out all the resonant structures, except for the most massive planets. The planetesimals also initially have to be on orbits with a mean eccentricity of less than than 0.1 in order to keep the resonant clumps visible. Conclusions: This numerical work extends previous analytical studies and provides a collection of disk images that may help in interpreting the observations of structures in debris disks. Overall, it shows that stringent conditions must be fulfilled to obtain observable resonant structures in debris disks. Theoretical models of the origin of planetary migration will therefore have to explain how planetary systems remain in a suitable configuration to reproduce the observed structures. [less ▲]

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See detailNeural Correlates of Envisioning Emotional Events in the near and Far Future
D'Argembeau, Arnaud ULg; Xue, Gui; Lu, Zhong-Lin et al

in NeuroImage (2008), 40(1), 398-407

Being able to envision emotional events that might happen in the future has a clear adaptive value. This study addressed the functional neuroanatomy of this process and investigated whether it is ... [more ▼]

Being able to envision emotional events that might happen in the future has a clear adaptive value. This study addressed the functional neuroanatomy of this process and investigated whether it is modulated by temporal distance. Participants imagined positive and negative events pertaining to the near future or far future while their brain activity was measured with fMRI. The results demonstrate that the anterior part of the ventromedial prefrontal cortex (vmPFC) was more active in envisioning emotional events in the far future than in the near future, whereas the caudate nucleus was engaged in envisioning emotional (especially positive) situations in the near future. We argue that the anterior part of the vmPFC might assign emotional values to mental representations of future events that pertain to long-term goals. On the other hand, the caudate might support more concrete simulations of action plans to achieve rewarding situations in the near future. [less ▲]

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See detailWASP-4b: A 12th Magnitude Transiting Hot Jupiter in the Southern Hemisphere
Wilson, D. M.; Gillon, Michaël ULg; Hellier, C. et al

in Astrophysical Journal (2008), 675

We report the discovery of WASP-4b, a large transiting gas-giant planet with an orbital period of 1.34 days. This is the first planet to be discovered by the SuperWASP-South observatory and CORALIE ... [more ▼]

We report the discovery of WASP-4b, a large transiting gas-giant planet with an orbital period of 1.34 days. This is the first planet to be discovered by the SuperWASP-South observatory and CORALIE collaboration and the first planet orbiting a star brighter than 16th magnitude to be discovered in the southern hemisphere. A simultaneous fit to high-quality light curves and precision radial velocity measurements leads to a planetary mass of 1.22[SUP]+0.09[/SUP][SUB]-0.08[/SUB] M[SUB]Jup[/SUB] and a planetary radius of 1.42[SUP]+0.07[/SUP][SUB]-0.04[/SUB] R[SUB]Jup[/SUB]. The host star is USNO-B1.0 0479-0948995, a G7 V star of visual magnitude 12.5. As a result of the short orbital period, the predicted surface temperature of the planet is 1761 K, making it an ideal candidate for detections of the secondary eclipse at infrared wavelengths. [less ▲]

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See detailLupus-TR-3b: A Low-Mass Transiting Hot Jupiter in the Galactic Plane?
Weldrake, David T F; Bayliss, Daniel D R; Sackett, Penny D et al

in Astrophysical Journal (2008), 675

We present a strong case for a transiting hot Jupiter planet identified during a single-field transit survey toward the Lupus Galactic plane. The object, Lupus-TR-3b, transits a V=17.4 K1 V host star ... [more ▼]

We present a strong case for a transiting hot Jupiter planet identified during a single-field transit survey toward the Lupus Galactic plane. The object, Lupus-TR-3b, transits a V=17.4 K1 V host star every 3.91405 days. Spectroscopy and stellar colors indicate a host star with effective temperature 5000 +/- 150 K, with a stellar mass and radius of 0.87 +/- 0.04 M[SUB]solar[/SUB] and 0.82 +/- 0.05 R[SUB]solar[/SUB], respectively. Limb-darkened transit fitting yields a companion radius of 0.89+/-0.07 R[SUB]J[/SUB] and an orbital inclination of 88.3[SUP]+1.3[/SUP][SUB]-0.8[/SUB] deg. Magellan 6.5 m MIKE radial velocity measurements reveal a 2.4 sigma K = 114 +/- 25 m s[SUP]-1[/SUP] sinusoidal variation in phase with the transit ephemeris. The resulting mass is 0.81 +/- 0.18 M[SUB]J[/SUB] and density 1.4 +/- 0.4 g cm[SUP]-3[/SUP]. Y-band PANIC image deconvolution reveals a V>=21 red neighbor 0.4[SUP]''[/SUP] away which, although highly unlikely, we cannot conclusively rule out as a blended binary with current data. However, blend simulations show that only the most unusual binary system can reproduce our observations. This object is very likely a planet, detected from a highly efficient observational strategy. Lupus-TR-3b constitutes the faintest ground-based detection to date, and one of the lowest mass hot Jupiters known. [less ▲]

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See detailL'astronomie dans le monde
Manfroid, Jean ULg

Article for general public (2008)

Cycle solaire; RS Oph; Une nouvelle lumière sur l'énergie sombre; NGC 1132 : un fossile cosmique; Distance de RS Pup; Westerlund 2; L'univers dodécaédrique; THINGS; Mercure;

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See detailComparison of bovine and human O26 EHEC strains by the Whole Genome PCR Scanning
Bardiau, Marjorie ULg; Ogura, Y.; Hayashi, T. et al

Conference (2008, March)

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See detailComparison of bovine and human O26 EHEC strains by the Whole Genome PCR Scanning
Bardiau, Marjorie ULg; Ogura, Y.; Hayashi, T. et al

Conference (2008, March)

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See detailLe droit commercial général (fonds de commerce, secteur public local, faillites)
Gol, Déborah ULg; Thirion, Nicolas ULg; Pasteger, David ULg

in Chroniques Notariales (2008), 47

Chronique de législation et de jurisprudence en matière de droit commercial général à destination des professions notariales

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See detailEditorials
Fecher-Bourgeois, Fabienne ULg; Thiry, Bernard ULg

in Annals of Public and Cooperative Economics (2008), 79(1), 1-2

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See detailBELGES, WALLONS OU FRANCOPHONES : SOMMES-NOUS OBLIGES DE CHOISIR ?
Italiano, Patrick ULg

in D'autres repères (2008)

Analyse de l'évolution des sentiments d'appartenance belge, wallon et européen de 1988 à 2007, et de la dynamique qui les relie. Mise en perspective avec les événements politiques des différentes périodes ... [more ▼]

Analyse de l'évolution des sentiments d'appartenance belge, wallon et européen de 1988 à 2007, et de la dynamique qui les relie. Mise en perspective avec les événements politiques des différentes périodes traversées. [less ▲]

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See detailExplication et réduction de l’impact des violations d’inégalités triangulaires dans Vivaldi
Cantin, François ULg; Gueye, Cheikh Ahmadou Bamba ULg; Kaafar, Mohamed Ali ULg et al

in CFIP'2008 (2008, March)

Les systèmes de coordonnées sont des systèmes distribués ayant pour but, à partir de mesures de distance (par exemple RTT) entre certaines paires de noeuds, d’associer des coordonnées à chaque noeud dans ... [more ▼]

Les systèmes de coordonnées sont des systèmes distribués ayant pour but, à partir de mesures de distance (par exemple RTT) entre certaines paires de noeuds, d’associer des coordonnées à chaque noeud dans un espace métrique. Toutefois, de tels systèmes ne fonctionnent pas correctement lorsque les distances mesurées ne respectent pas les inégalités triangulaires. Or, les violations de ces inégalités, appelées TIV, sont fréquentes dans l’Internet. Nous proposons une étude approfondie de l’impact des TIV sur le système de coordonnées Vivaldi. Nous quantifions et expliquons les erreurs de prédiction de distance et l’instabilité des coordonnées causées par les TIV selon leur fréquence et leur sévérité. Nous montrons aussi que la distance entre deux noeuds, mesurée par le RTT, est corrélée à la probabilité d’existence d’une TIV. Enfin, nous recommandons un système de coordonnées hiérarchique, et nous montrons, par des simulations sur une matrice de délais réelle, qu’une telle approche réduit l’impact des TIV. [less ▲]

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See detailLes mammifères non volants de la commune de Fernelmont
Libois, Roland ULg; Le Proux de la Rivière, Bettina

in Saintenoy Simon, Jacqueline (Ed.) Le patrimoine d'une commune rurale: Fernelmont (2008, March)

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See detailInterpretation of a tracer test at Brévilles after 2 years of monitoring
Goderniaux, Pascal ULg; Gutierrez, Alexis; Brouyère, Serge ULg

Report (2008)

To understand and predict the behaviour and transfer of diffuse contamination, a small catchment is intensively studied in the vicinity of Paris. A multi tracer test involving a new technique, the FVPDM ... [more ▼]

To understand and predict the behaviour and transfer of diffuse contamination, a small catchment is intensively studied in the vicinity of Paris. A multi tracer test involving a new technique, the FVPDM method (Finite Volume Point Dilution Method - Brouyère et al., 2008) has been performed in natural flow conditions. Injections of four different tracers (uranine, sulforhodamine B, lithium chloride and potassium iodide) took place in four piezometers involving different areas of the aquifer and different depth. This tracer test follows a former test briefly described. A particularly long monitoring (Nov-2005 to Feb-2008) demonstrates the existence of several transport velocities within the sandy layer, which seems linked to the decrease of hydraulic conductivity with depth. Absence of recovery of two tracers confirms the results of the former test and identifies spatial heterogeneities probably due to the geological structure. The new insight and parameter quantification brought by interpretation of these tests contributes to a better characterization of the saturated zone and shall be exploited through modelling for transport predictions of pesticides. [less ▲]

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See detailReport on the development of the Geer Hydrological model. Final results about climate change impacts evaluation.
Goderniaux, Pascal ULg; Brouyère, Serge ULg; Orban, Philippe ULg et al

Report (2008)

In the framework of Workpackage BASIN R3 Meuse, the Hydrology Group of the University of Liège (Belgium) has developed a hydrological model of the Geer sub-catchment, in order to assess climate change ... [more ▼]

In the framework of Workpackage BASIN R3 Meuse, the Hydrology Group of the University of Liège (Belgium) has developed a hydrological model of the Geer sub-catchment, in order to assess climate change impacts on groundwater reserves. The water resource Systems Research Laboratory of the Newcastle University has produced the climate change scenarios applied on the hydrological model. This report describes the methodology used, the implementation of the hydrological model, the climate change scenarios and the results of the study. [less ▲]

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