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See detailCurrent perspectives on microwave-enhanced reactions of monosaccharides promoted by heterogeneous catalysts.
Richel, Aurore ULg; Laurent, Pascal ULg; Wathelet, Bernard ULg et al

in Catalysis Today (2011), 167

Involvment of heterogeneous catalysts as promoters of carbohydrate conversions, in synergy with microwaves as the heating source, is reported. This paper deals with the application of ion-exchange resins ... [more ▼]

Involvment of heterogeneous catalysts as promoters of carbohydrate conversions, in synergy with microwaves as the heating source, is reported. This paper deals with the application of ion-exchange resins, zeolites, clays and metal oxides as convenient mediators for key transformations of carbohydrates. A special emphasis is placed on the use of (doped) mineral supports, in solventless conditions, as clean promoters in combination with microwave dielectric heating. [less ▲]

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See detailRefinement of Non-Linear Magnetic Models via a Finite Element Subproblem Method
Dular, Patrick ULg; Krähenbühl, Laurent; V Sabariego, Ruth ULg et al

(2011)

Model refinements of non-linear magnetic circuits are performed via a finite element subproblem method. A com- plete problem is split into subproblems to allow a progression from 1-D to 3-D including ... [more ▼]

Model refinements of non-linear magnetic circuits are performed via a finite element subproblem method. A com- plete problem is split into subproblems to allow a progression from 1-D to 3-D including linear to non-linear model corrections. Its solution is then expressed as the sum of the subproblem solu- tions supported by different meshes. A convenient and robust correction procedure is proposed allowing independent overlapping meshes for both source and reaction fields. It simplifies both meshing and solving processes, and quantifies the gain given by each refinement on both local fields and global quantities. [less ▲]

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See detailQuantitative evaluation of fluid resuscitation in burn children : a retrospective study.
ROUSSEAU, Anne-Françoise ULg; LEDOUX, Didier ULg; RICHARD, Patrick et al

in Burns : Journal of the International Society for Burn Injuries (2011), 37(suppl 1), 12

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See detailCatalogue des monnaies islamiques du Musée Bottacin
Bauden, Frédéric ULg

Book published by Esedra Editrice (2011)

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See detailEarly developmental actions of endocrine disruptors on the hypothalamus, hippocampus, and cerebral cortex.
Parent, Anne-Simone ULg; Naveau, Elise; GERARD, Arlette ULg et al

in Journal of Toxicology and Environmental Health. Part B, Critical Reviews (2011), 14(5-7), 328-45

Sex steroids and thyroid hormones play a key role in the development of the central nervous system. The critical role of these hormonal systems may explain the sensitivity of the hypothalamus, the ... [more ▼]

Sex steroids and thyroid hormones play a key role in the development of the central nervous system. The critical role of these hormonal systems may explain the sensitivity of the hypothalamus, the cerebral cortex, and the hippocampus to endocrine-disrupting chemicals (EDC). This review examines the evidence for endocrine disruption of glial-neuronal functions in the hypothalamus, hippocampus, and cerebral cortex. Focus was placed on two well-studied EDC, the insecticide dichlorodiphenyltrichloroethane (DDT) and polychlorinated biphenyls (PCB). DDT is involved in neuroendocrine disruption of the reproductive axis, whereas polychlorinated biphenyls (PCB) interact with both the thyroid hormone- and sex steroid-dependent systems and disturb the neuroendocrine control of reproduction and development of hippocampus and cortex. These results highlight the impact of EDC on the developing nervous system and the need for more research in this area. [less ▲]

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See detailDétection de zones humides dans le béton par GPR en présence d’un gradient d’humidité.
Louis, Arnaud ULg

Master's dissertation (2011)

The objective of this master thesis is to highlight the impact of the presence of a humidity gradient on the detection of a wet area in concrete by combining a numerical approach and experimental results ... [more ▼]

The objective of this master thesis is to highlight the impact of the presence of a humidity gradient on the detection of a wet area in concrete by combining a numerical approach and experimental results. In order to achieve this objective, several models have been conducted using a numerical simulation program of electromagnetic waves propagation. Influence of the size of the gradient, but also their position and shape, have been studied. Meanwhile, two experimental programs have been established in order to artificially generate a gradient of moisture into the concrete. This gradient was established by capillary rise in one case and by drying in the other case. Humidity sensors placed in the slabs allowed us to control the evolution of the transition zone located above the wet area. We tried then to correlate the evolution of the gradient with results from a Ground Penetrating Radar with 2.3 GHz antenna. We studied the influence of the gradient on the evolution with time of the electromagnetic field. This experimental program required many preliminary tests to define the dielectric properties of the slabs and the specific response of the sensors. Based on modeling, we concluded that the detection of the wet area remains possible as long as it is far enough from the direct wave and as its thickness is less than 2/5 of the signal wavelength. Regarding the experimental results, we were able to highlight the signal evolution with regard to the evolution of the moisture gradient. In the case of capillary rise, we were also able to confirm the trends predicted by modeling. [less ▲]

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See detailConfronter les idées : un exemple de conciliation litigieuse chez Simplicius
Gavray, Marc-Antoine ULg

in Études platoniciennes (2011), 8

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See detailIn vitro evaluation of the fermentation characteristics of the carbohydrate fractions of hulless barley and other cereals in the gastrointestinal tract of pigs
Jha, Rajesh; Bindelle, Jérôme ULg; Rossnagel, Brian et al

in Animal Feed Science & Technology (2011), 163

An in vitro model was used to study the fermentation characteristics of carbohydrate fractions of hulless barley (hB), in comparison to hulled barley (HB), hulled oat and oat groats (OG) in the pig ... [more ▼]

An in vitro model was used to study the fermentation characteristics of carbohydrate fractions of hulless barley (hB), in comparison to hulled barley (HB), hulled oat and oat groats (OG) in the pig intestine. For this purpose, 6 hulless barley cultivars (hB), varying in β-glucan content (36-99 g/kg DM), were compared to 3 HB cultivars, 2 oat groat samples (OG), 3 oat varieties and a reference sample of wheat. The residue of a pepsin-pancreatin hydrolysis was incubated in a buffered mineral solution inoculated with pig faeces. Gas production, proportional to the amount of fermented carbohydrates, was measured for 48 h and kinetics modelled. The fermented solution was subsequently analyzed for microbial production of short-chain fatty acids (SCFA) and ammonia. In vitro dry matter degradability varied according to ingredient (P<0.001). Higher values were observed for OG, ranging from 0.88 to 0.99 as compared to oat, hB and HB, for which degradability ranged from 0.63 to 0.73, 0.68 to 0.80 and 0.69 to 0.71, respectively. A “cereal type” effect (P<0.05) was observed on fermentation kinetics parameters. Total gas production was higher (P<0.05) with hB (224 ml/g DM incubated) than with HB and oat (188 and 55 ml/g DM incubated, respectively). No difference was observed between hB cultivars (P>0.05) for total gas production but differences (P<0.001) were found for lag time and the fractional rate of degradation. Hulless barley cultivar CDC Fibar (waxy starch) and CDC McGwire (normal starch) started to ferment sooner (lag time of 0.7 and 0.9 h, respectively) than SH99250 (high amylose starch; 1.7 h). The fractional rate of degradation was similar in both hB and OG (0.15/h on average), which was higher than that of HB (0.12/h). The production of SCFA was also higher (P<0.05) with hB (6.1 mmol/g DM incubated, on average) than with HB and oat (4.9 and 2.9 mmol/g DM incubated, respectively). Similar trends were found for SCFA production expressed per g fermented carbohydrates, with higher butyrate and lower acetate ratio. In contrast, oat fermentation generated higher (P<0.05) ammonia concentration (1.4 mmol/g DM incubated, on average) than hB (1.0 mmol/g DM incubated). In summary, hulless barleys, irrespective of cultivar type had higher in vitro fermentability and produced more SCFA and less ammonia than hulled barley and oat. Thus, hulless barleys have a better potential to be used in pig nutrition to manipulate the fermentation activity in the intestine of pigs. [less ▲]

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See detailSluse, ses perles et son algorithme
Bair, Jacques ULg; Henry, Valérie ULg

in Losanges (2011), 14

Cet article fait découvrir un savant belge, né à Visé, du 17 ème siècle dont l'oeuvre scientifique fut importante dans le développement des mathématiques.

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See detailMetformin and lactic acidosis.
SCHEEN, André ULg

in Acta Clinica Belgica (2011), 66(5), 329-31

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See detailReforming the Common Agricultural Policy. Perspective of 2013 and beyond
Burny, Philippe ULg

in Gazinski, Benon (Ed.) Szkice Europejskie. Historia-Gospodarka-Polityka (2011)

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See detailDevelopment of a Chitosan Nanofibrillar Scaffold for Skin Repair and Regeneration.
Tchemtchoua Tateu, Victor ULg; Atanasova, G.; Aqil, Abdelhafid ULg et al

in Biomacromolecules (2011), 12

The final goal of the present study was the development of a 3-D chitosan dressing that would shorten the healing time of skin wounds by stimulating migration, invasion, and proliferation of the relevant ... [more ▼]

The final goal of the present study was the development of a 3-D chitosan dressing that would shorten the healing time of skin wounds by stimulating migration, invasion, and proliferation of the relevant cutaneous resident cells. Three-dimensional chitosan nanofibrillar scaffolds produced by electrospinning were compared with evaporated films and freeze-dried sponges for their biological properties. The nanofibrillar structure strongly improved cell adhesion and proliferation in vitro. When implanted in mice, the nanofibrillar scaffold was colonized by mesenchymal cells and blood vessels. Accumulation of collagen fibrils was also observed. In contrast, sponges induced a foreign body granuloma. When used as a dressing covering full-thickness skin wounds in mice, chitosan nanofibrils induced a faster regeneration of both the epidermis and dermis compartments. Altogether our data illustrate the critical importance of the nanofibrillar structure of chitosan devices for their full biocompatibility and demonstrate the significant beneficial effect of chitosan as a wound-healing biomaterial. [less ▲]

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See detailCaractérisation des pigments préhistoriques par analyse PIXE
Lebon, Matthieu; Beck, Lucile; Lahlil, Sophia et al

Poster (2011)

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See detailIntroduction à la chromatographie liquide
Debrus, Benjamin ULg; Hubert, Philippe ULg

Learning material (2011)

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See detailNecessity of phenotypic classification of inflammatory bowel disease.
Louis, Edouard ULg; VAN KEMSEKE, Catherine ULg; Reenaers, Catherine ULg

in Best practice & research. Clinical gastroenterology (2011), 25 Suppl 1

Inflammatory bowel diseases (IBD) are classically divided in Crohn's disease (CD) and ulcerative colitis (UC). However, these two entities are still heterogeneous and a further classification in ... [more ▼]

Inflammatory bowel diseases (IBD) are classically divided in Crohn's disease (CD) and ulcerative colitis (UC). However, these two entities are still heterogeneous and a further classification in subphenotypes is necessary. Clinical subphenotypes are easy to use, do not necessitate complicated tests and can already give very important information for the management of the patients. In CD, clinical subphenotypes are based on age at diagnosis, disease location and disease behaviour. Age at diagnosis allows to differentiating paediatric CD, classical young adult onset and more seldom CD of the elderly. These categories are associated with a different risk of development of complications and disabling disease and may have partly different pathophysiology. The classification on disease behaviour, including stricturin, penetrating or uncomplicated disease may have an impact on reponse to medical treatment and need for surgery. Finally the classification based on location is particularly relevant since it has been associated with different types of complications. Particularly ileal disease has been associated with the risk of surgery and colonic (particularly rectal) disease, with the risk of perianal disease. In UC, the classification in subphenotypes is essentially based on disease location, distinguishing proctitis, left-sided colitis and extensive colitis. This subclassification also has a very significant clinical relevance since extensive colitis has been associated with and increased risk of colon cancer, colectomy and even in some studies, mortality. [less ▲]

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See detailDémarches participatives et approches quali-quantitatives. Le projet logiciel Mesydel 2012
François, Aurore ULg; Rieppi, Stéphane ULg; Thiry, Aline ULg

in Claisse, Frédéric; Laviolette, C.; Reuchamps, M. (Eds.) et al La participation en action (2011)

Depuis plusieurs années, le laboratoire Spiral (Université de Liège, Département de Science politique), recourt régulièrement à la méthode Delphi pour mener certaines de ses recherches. Cette méthode ... [more ▼]

Depuis plusieurs années, le laboratoire Spiral (Université de Liège, Département de Science politique), recourt régulièrement à la méthode Delphi pour mener certaines de ses recherches. Cette méthode itérative de consultation d'experts, privilégiant l'anonymat et le recours à l'écrit, s'est ainsi vue librement adaptée – comme bien d'autres méthodes d'ailleurs – aux défis du participatif. Le traditionnel « panel d'experts » a ainsi largement été redéfini, autorisant, voire privilégiant, le recours aux experts dits « d'usage » dans le cadre de recherches se revendiquant des méthodologies participatives. En 2008, le laboratoire Spiral a élaboré son propre logiciel, Mesydel, permettant de mener en ligne un processus d'enquête Delphi complet : création de questionnaires, invitation des participants à le compléter, analyse et synthèse des réponses qui serviront de base à la préparation du questionnaire suivant (suivant le principe de la « rétroaction contrôlée »), traitement des données. Au fil de son histoire, l'approche du Mesydel s'est par ailleurs étoffée et diversifiée. Privilégiant à l'origine une analyse qualitative des contenus récoltés, le logiciel a progressivement intégré une série d'outils permettant des traitements plus quantitatifs. À ce jour, Mesydel peut se revendiquer d'une approche dite mixte, combinant des traitements qualitatifs et quantitatifs, et ce sur un même corpus de données. Ces multiples adaptations à partir du Delphi traditionnel, à savoir l'ouverture au participatif d'une part, et la transposition en ligne d'autre part, de même que l'inscription progressive du Mesydel dans les méthodes de recherche dites mixtes, constituent autant d'éléments qui n'ont pas manqué (et continuent) de nourrir les réflexions méthodologiques au sein du laboratoire, parmi les chercheurs, utilisateurs et développeurs de l'outil. Cette contribution propose de faire le point sur ces différents enjeux, à partir d'exemples tirés du projet de recherche ANACO – Analyse et opérationnalisation de la mesure de mise à l'abri et de confinement en Belgique, recherche effectuée en 2011 (financement IBZ – Ministère de l'intérieur). [less ▲]

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See detailResistant prolactinomas
Vasilev, V.; Daly, Adrian ULg; VROONEN, Laurent ULg et al

in Journal of Endocrinological Investigation (2011), 34

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