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See detailVers une vision plus positive de la maladie d'Alzheimer: Enjeux cliniques et éthique
Adam, Stéphane ULg

Conference given outside the academic context (2014)

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See detailBilan de carbone d'une prairie pâturée en Région wallonne: effets du climat et de la gestion du pâturage
Jerome, Elisabeth ULg

Doctoral thesis (2014)

As grassland carbon (C) sequestration can play an important role in mitigating total greenhouse gas (GHG) emissions of livestock production systems (carbon dioxide – CO2, nitrous oxide – N2O, methane – ... [more ▼]

As grassland carbon (C) sequestration can play an important role in mitigating total greenhouse gas (GHG) emissions of livestock production systems (carbon dioxide – CO2, nitrous oxide – N2O, methane – CH4), this PhD investigates the C balance of an intensively managed grazed grassland in the temperate climate of southern Belgium. It analyses more particularly impact of climatic conditions and management practices on the C balance. The research site is a permanent grassland, covering 4.22 ha, intensively used for more than 50 years for Belgian Blue cattle grazing with the application of organic and inorganic fertilizers. Management practices but also climatic conditions are representative of livestock production systems developed in southern Belgium. Over a three years study period, soil C stock variations are determined indirectly by measuring the balance of C fluxes at the system boundaries. This approach not only takes into account CO2 and CH4 exchanged with the atmosphere but also organic C imports (manures, complementary feedings), exports (harvests, animal products) and C lost through leaching. CO2 fluxes are measured by eddy covariance while other C fluxes are estimated from data provided directly by the farmer, from punctual measurements and from aboveground herbage mass measurements. Considering only assimilation and respiration, the ecosystem behaves, on average, as a weak CO2 source, although the interannual variability is large. Interannual variability seems not to be significantly correlated with the main environmental drivers but rather influenced by fertilization management. Taking other C fluxes into account, the site appears as being at equilibrium. Management (organic fertilization), as well as climatic conditions that dictated them (complementary feeds), are the principal factors influencing the C balance. Finally, results show that management practices were the key control of the C flux variability at this grassland. Grazing impact on CO2 fluxes appears not explicitly at the seasonal and annual scale. It is therefore quantified by developing innovative eddy covariance data analyses and experiments. For that, indirect and direct grazing impacts are separated. Indirect impact results from biomass consumption, excretion deposits and soil compaction by cattle modifying CO2 exchanges. To quantify it, the variation during periods with fixed stocking rate of gross primary productivity at light saturation (GPPmax) and normalised dark respiration (Rd,10) is analysed. On average, GPPmax decreases during grazing periods and increases during non-grazing periods. This could respectively be explained by aboveground biomass reduction and re-growth. In addition, GPPmax variations are negatively correlated to grazing intensity (defined as the product of the stocking rate and the grazing duration). On the contrary, no significant evolution of Rd,10 is found during both grazing and non-grazing periods, probably due to a combination of opposing effects of grazing on the total ecosystem respiration components. Direct impact results from livestock CO2 emissions through respiration that adds to the total ecosystem respiration. It is emphasized through specific designed livestock confinement experiments. Net CO2 exchange is compared on successive days with similar climatic conditions, livestock being confined (≈ 26 livestock units ha-1), or not, in the main wind direction area of the eddy covariance set-up. Results obtained are corroborated by independent estimates based on the C ingested by cattle during confinement. Finally, the C balance analysis of this particular grazed grassland in southern Belgium reveals that, taking into account the climatic conditions observed and the management practices developed over the three study years, the site is C neutral. This means that GHG emissions linked to fertilization (N2O) and grazing (CH4) are not partly mitigated by soil C sequestration. However, we conclude that, management practices being the main factor controlling the C balance, strategies to enhance soil C sequestration exist. If those kinds of management practices are studied, a global approach, taking into consideration both the C fluxes and other GHG fluxes, would be required to see if they do not induce supplementary N2O and CH4 emissions. [less ▲]

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See detailComplexions et relations. Sur les objets d’ordre supérieur I
Zincq, Aurélien ULg

Conference (2014, September 22)

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See detailFonction de Riemann généralisée
Simons, Laurent ULg; Bastin, Françoise ULg; Nicolay, Samuel ULg

Conference (2014, September 22)

Dans cet exposé, nous étudions la régularité de la fonction de Riemann généralisée~$R_{\alpha,\beta}$ (avec $\alpha>1$ et $\beta>0$) définie par \[ R_{\alpha,\beta}(x)=\sum_{n=1}^{+\infty}\frac{\sin(\pi n ... [more ▼]

Dans cet exposé, nous étudions la régularité de la fonction de Riemann généralisée~$R_{\alpha,\beta}$ (avec $\alpha>1$ et $\beta>0$) définie par \[ R_{\alpha,\beta}(x)=\sum_{n=1}^{+\infty}\frac{\sin(\pi n^\beta x)}{n^\alpha},\quad x\in\R. \] En particulier, nous déterminons son exposant de Hölder uniforme. Pour terminer, nous analysons le comportement de~$R_{\alpha,\beta}$ lorsque le paramètre $\alpha$ ou $\beta$ tend vers l'infini. Cet exposé est basé sur un travail en collaboration avec F. Bastin et S. Nicolay. [less ▲]

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See detailValorization of Tunisian secondary date varieties (Phoenix Dactylifera L.) by hydrothermal treatments : New fiber concentrates with antioxidant properties
Mrabet, Abdessalem; Rodriguez-Gutierrez, Guillermo; Guillen-Bejarano, Rafael et al

in LWT - Food Science and Technology (2014)

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See detailOsteochondrosis-Related Gene Expression in Equine Leukocytes Differs among Affected Joints in Foals
Serteyn, Didier ULg; Piquemal, David; Mendoza García, Luis ULg et al

in Journal of biomarkers and diagnosis (2014), 5

Osteochondrosis (OC) is a developmental disease in horses with a significant impact on the horse’s welfare and performance. Previously, differentially expressed genes in leukocytes of OC-affected have ... [more ▼]

Osteochondrosis (OC) is a developmental disease in horses with a significant impact on the horse’s welfare and performance. Previously, differentially expressed genes in leukocytes of OC-affected have been identified and were differentially expressed in horses of different ages when compared to their age-matched controls.As the time course of the development of OC lesions seems to be joint dependent,the aim of this study is to compare in young OCaffected horses (between 8 to 12 months), the different expression of selected genes depending the joints involved.The expression of OC-related genes were analysed by rt-PCR and subsequent statistical analysis (ΔΔCT) in the leukocytes of 30 Belgian Warmblood horses aged between 8 to 12 months divided in groups depending the affected joints (fetlock, hock and stifle).In the three groups, expression of ApoB-3G, MGAT4A, B4GALT6 and PRKCG genes were significantly higher in the OC-affected foals compared to the healthy foals. Based on the profiles of expression ofApoB-3G, Dsh1/Dvl1, Foxl1, Hp, ISG15, Mark2, PPR2A, RUSC2 and WASH1 genes,the localization of the disease can be determined: expression levels of ApoB3G, WASH1 and FOXl1 to identify fetlock, ApoB3G, PPR2A to identify OC-development in the hock and ApoB3G, Dsh1/Dvl1, WASH1, PPP2R1A and Mark2 geneto identify OC-development in the stifle. However at this moment, the rt-PCR analysis of the identified genes as biomarkers gives only diagnostic information. For the future, the profile of expression of these genes could give also some predictive information on the evolution of the disease such as remission or permanent OC-lesions. [less ▲]

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See detailSex determinism in Fish - the Belgian team case studies
Rougeot, Carole ULg; Gennotte, Vincent ULg; Santi, Saïdou ULg et al

Conference (2014, September 22)

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See detailRouvrir une mine à Plombières. Une utopie ?
Pirard, Eric ULg

in Simons, Marc (Ed.) Plomb'hier à bonnes mines. (2014)

Plombières, Ferrières, Goldgrübe,… autant de noms qui dans nos régions renvoient aux sept métaux connus depuis l’Antiquité. Sept métaux comme les sept planètes ou les sept jours de la semaine à l’image ... [more ▼]

Plombières, Ferrières, Goldgrübe,… autant de noms qui dans nos régions renvoient aux sept métaux connus depuis l’Antiquité. Sept métaux comme les sept planètes ou les sept jours de la semaine à l’image d’un monde parfait. Pourtant, si pendant des siècles, ces métaux ont suffi à satisfaire nos besoins technologiques, il n’en va plus de même aujourd’hui : l’éolienne a remplacé le moulin à vent et l’ordinateur s’est substitué à la craie ! Avec la production de 900.000 t de zinc et 100.000 t de plomb, les gisements de Moresnet ont eu une importance historique majeure dans le développement d’une véritable industrie du zinc. Ils ont aussi joué un rôle important dans la découverte d’éléments rares comme le gallium. Notre société ne peut plus se passer de ces métaux, jamais leur exploitation n’a été aussi intense et ce malgré l’existence et le développement constant du recyclage. Les mines de nos régions ont fermé il y a près d’un siècle, faute de technologies adéquates pour localiser de nouvelles ressources ou pour réaliser une exhaure efficace. Très vite, il s’est avéré plus simple et plus rentable de faire venir le minerai de régions lointaines comme l’Afrique, l’Australie et aujourd’hui la Chine. Pourtant, rien ne dit qu’il ne reste pas des quantités significatives de zinc et de plomb dans notre sous-sol. Pour des raisons stratégiques évidentes, l’Europe souhaite que nous réévaluions nos ressources et nos réserves avec les moyens les plus modernes. Une mise en exploitation n’est pas pour autant à l’ordre du jour. Elle ne pourra de toute façon résulter que de la volonté concertée de tous les acteurs d’une région unis autour d’un même objectif. [less ▲]

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See detailThermo-responsive gold/poly(vinyl alcohol)-b-poly(N-vinylcaprolactam) core–corona nanoparticles as a drug delivery system
Liu, Ji ULg; Detrembleur, Christophe ULg; Hurtgen, Marie et al

in Polymer Chemistry (2014), 5(18), 5289-5299

Core–corona gold/poly(vinyl alcohol)-b-poly(N-vinylcaprolactam) nanoparticles (gold@PVOH-b-PNVCL NPs) were fabricated via an in situ method, where a gold salt was reduced within the macromolecular aqueous ... [more ▼]

Core–corona gold/poly(vinyl alcohol)-b-poly(N-vinylcaprolactam) nanoparticles (gold@PVOH-b-PNVCL NPs) were fabricated via an in situ method, where a gold salt was reduced within the macromolecular aqueous solution. Arrangement of macromolecular chains on the surface of gold cores was studied by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy and infrared spectroscopy. The responsiveness to temperature and the preserved colloidal stability of the gold@PVOH-b-PNVCL NPs above the lower critical solution temperature (LCST) were confirmed by dynamic light scattering and turbidity measurements. The drug loading capacity (DLC of ca. 1.3–2.8 wt%) of the gold@PVOH-b-PNVCL NPs as a drug delivery system (DDS) was tested with Nadolol®, a hydrophilic drug, and the release behaviours were studied at several temperatures. PVOH-b-PNVCL copolymers with an LCST of a few degrees above the biological temperature (37 °C), for example, PVOH180-b-PNVCL110 (LCST of 41 °C), are preferential, due to the slower release at 37 °C, but a faster release at temperatures that are a few degrees higher. The cytocompatibility of the gold@PVOH-b-PNVCL NPs against mouse fibroblastic L929 cells was evaluated via the MTS assay. Cellular uptake within MEL-5 human melanoma cells was studied by confocal laser scanning microscopy, fluorescence-activated cell sorting and TEM techniques and it showed that gold@PVOH-b-PNVCL NPs preferably accumulated within the cellular cytoplasm, with an incubation concentration and period-dependent uptake process. All these results corroborated a general utility of these thermo-responsive gold@PVOH-b-PNVCL NPs for drug delivery and controlled drug release. [less ▲]

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See detailBlock, random and palm-tree amphiphilic fluorinated copolymers: controlled synthesis, surface activity and use as dispersion polymerization stabilizers
Alaimo, David ULg; Beigbeder, Alexandre; Dubois, Philippe et al

in Polymer Chemistry (2014), 5(18), 5273-5282

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See detailLivret-guide de l'excursion géologique dans la vallée du Hoyoux (Belgique) pour les membres de la Société Géologique du Nord
Mottequin, Bernard; Marion, Jean-Marc ULg; Goemaere, Eric

Diverse speeche and writing (2014)

L'excursion se place entièrement dans le bord nord du Synclinorium de Dinant tel qu'il est exposé le long de la vallée du Hoyoux, un affluent de la Meuse à Huy (Belgique) situé sur sa rive droite. Elle ... [more ▼]

L'excursion se place entièrement dans le bord nord du Synclinorium de Dinant tel qu'il est exposé le long de la vallée du Hoyoux, un affluent de la Meuse à Huy (Belgique) situé sur sa rive droite. Elle offre l'opportunité de se familiariser avec la puissante succession sédimentaire dévono-carbonifère (Lochkovien-Namurien). Les dépôts de tufs calcaires de rivière, fossiles et en formation ("travertins" du Hoyoux) sont aussi concernés. Une attention particulière est portée sur la sédimentologie, la tectonique, la géomorphologie et l'utilisation des matériaux dans le patrimoine bâti. [less ▲]

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See detailFractures of proximal tibia: general principles
KURTH, William ULg

Conference (2014, September 20)

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See detailExplicit similarities and expected variabilities: the Initial Upper Paleolithic in Northeast Asia
Zwyns, N.; Teyssandier, N.; Izuho, M. et al

Conference (2014, September 19)

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See detailWhen morphometrics meets genetics: the case of the hazel dormouse, Muscardinus avellanarius
Mouton, Alice ULg; Renaud, Sabrina; Michaux, Johan ULg

Conference (2014, September 19)

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See detailTransnational Health Insurance Schemes: A New Avenue for Congolese Immigrants in Belgium to Care for Their Relatives’ Health from Abroad?
Lafleur, Jean-Michel ULg; Lizin, Olivier

Scientific conference (2014, September 19)

What can immigrants do for non-migrant relatives in their home country who need healthcare they cannot afford? To answer this question, we first examine four existing methods that can be found in the ... [more ▼]

What can immigrants do for non-migrant relatives in their home country who need healthcare they cannot afford? To answer this question, we first examine four existing methods that can be found in the existing literature: mobility, remittances, workers’ health insurance and diasporic health insurance. In the second part of the paper, we discuss an innovative strategy called “transnational health insurance” (THI). These insurance schemes are set up by immigrants in cooperation with a multitude of actors including health insurance companies in destination countries and healthcare providers in countries origin. THIs offer health coverage to non-migrant relatives in the home country based on a premium paid directly by immigrants to the insurance company in their country of residence. Analyzing the creation and implementation of Belgian-Congolese THIs, we discuss the strengths and weaknesses of these schemes in responding to the needs of both immigrants and their non-migrant relatives. The article concludes with a discussion on the specificities of THIs as hybrid forms of remittances. [less ▲]

Detailed reference viewed: 75 (14 ULg)