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See detailSivers asymmetry for the proton and the neutron
Scopetta, S.; Courtoy, Aurore ULg; Fratini, F. et al

in AIP Conference Proceedings (2008), 1056

A formalism is presented to evaluate the Sivers function in constituent quark models. A non-relativistic reduction of the scheme is performed and applied to the Isgur-Karl model. The results obtained are ... [more ▼]

A formalism is presented to evaluate the Sivers function in constituent quark models. A non-relativistic reduction of the scheme is performed and applied to the Isgur-Karl model. The results obtained are consistent with a sizable Sivers effect and the signs for the u and d flavor contributions turn out to be opposite. The Burkardt Sum Rule is fulfilled to a large extent. After the estimate of the QCD evolution of the results from the momentum scale of the model to the experimental one, a reasonable agreement with the available data is obtained. A calculation of nuclear effects in the extraction of neutron single spin asymmetries in semi-inclusive deep inelastic scattering off 3He is also described. In the kinematics of forth-coming experiments at JLab, it is found that the nuclear effects arising within an Impulse Approximation approach are under control. © American Institute of Physics. [less ▲]

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See detailOptimalisation des techniques prothetiques de rehabilitation orale grace a l'orthodontie: analyse d'un cas clinique.
Lies, Céline ULg; Fernandez, S.; Limme, Michel ULg et al

in Revue Médicale de Liège (2008), 63(10), 609-14

This clinical case underlines the importance of a multidisciplinary approach, prosthetic and orthodontic, for the achievement of an oral rehabilitation treatment plan. Preliminary orthodontic treatment ... [more ▼]

This clinical case underlines the importance of a multidisciplinary approach, prosthetic and orthodontic, for the achievement of an oral rehabilitation treatment plan. Preliminary orthodontic treatment has significantly improved, the position of some natural teeth, which can serve or not as a prosthetic abutment. This has produced a direct prosthetic benefit by limiting tissue reduction for preparation and by giving a better biomechanical and functional context to the restoration.Thus, after an orthodontic treatment step, lasting a year and a half, using both removable appliance and fixed appliance, prosthetic rehabilitation was possible. This included a fixed prosthesis and a removable prosthesis that gave a very satisfying an esthetic result and good masticatory function. [less ▲]

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See detailActualités thérapeutiques dans la migraine.
Fumal, Arnaud ULg; Gérardy, Pierre-Yves ULg; Schoenen, Jean ULg

in Revue Médicale de Liège (2008), 63(5-6), 315-29

Despite its high prevalence and individual as well as societal burden, migraine remains underdiagnosed and undertreated. In recent years, the options for the management of migraine patients have greatly ... [more ▼]

Despite its high prevalence and individual as well as societal burden, migraine remains underdiagnosed and undertreated. In recent years, the options for the management of migraine patients have greatly expanded. A number of drugs belonging to various pharmacological classes and deliverable by several routes are now available both for the acute and the preventive treatments of migraine. Nevertheless, disability and satisfaction remain low in many subjects because treatments are not accessible, not optimized, not effective or simply not tolerated. There is thus still considerable room for better education and for more efficient therapies. In spite of useful internationally accepted guidelines, anti-migraine treatment has to be individually tailored to each patient taking into account the migraine subtype, the ensuing disability, the patient's previous history and present expectations, and the comorbid disorders. In this article we will summarize the phenotypic presentations of migraine and review recommendations for acute and preventive treatment, highlighting recent advances which are relevant for clinical practice in terms of both diagnosis and management. [less ▲]

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See detailLe système endocannabinoïde dans le cerveau... et ailleurs
Scheen, André ULg; Seutin, Vincent ULg; Van Gaal, L. F.

in Revue Médicale de Liège (2008), 63(5-6), 364-71

The endocannabinoid system is a complex system with endogenous ligands, synthesis and transport processes, specific receptors (CB1 and CB2) and intracellular degrading enzymes. It is widely distributed in ... [more ▼]

The endocannabinoid system is a complex system with endogenous ligands, synthesis and transport processes, specific receptors (CB1 and CB2) and intracellular degrading enzymes. It is widely distributed in the central nervous system, but also in peripheral organs. In the brain, endocannabinoids and CB1 receptors are almost ubiquitous and play a role in synaptic plasticity: they modulate, through an inhibitory retrograde action, the release of classical neurotransmitters such as amines, acetylcholine or amino acids. They may exert a neuroprotective effect, but are also involved in appetite and alcohol/drug dependence. At the periphery, they are present (and overexpressed in case of abdominal obesity) in various organs involved in energy control and metabolic regulation. Furthermore, CB2 receptors are also present in the brain, although less numerous than CB1 receptors. They could attenuate pain and also be neuroprotective. Selective agonists, antagonists and inverse agonists of CB1 and CB2 receptors are currently developed and open new interesting therapeutic perspectives. Rimonabant, a CB1 antagonist, has been recently launched for the treatment of obese or overweight patients at high cardiometabolic risk. [less ▲]

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See detailBande dessinée. Norme et transgression.
Paques, Frédéric ULg

in Art&Fact (2008), 27

Ce numéro spécial de la revue "Art&Fact" porte sur la bande dessinée. La question de la norme et de la transgression se pose avec beaucoup d'acuité pour cette forme d'art étroitement liée à des ... [more ▼]

Ce numéro spécial de la revue "Art&Fact" porte sur la bande dessinée. La question de la norme et de la transgression se pose avec beaucoup d'acuité pour cette forme d'art étroitement liée à des contraintes extérieures (marché, technique, public ciblé,...). [less ▲]

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See detailClassification of coronary artery bifurcation lesions and treatments: time for a consensus!
Louvard, Yves; Thomas, Martyn; Dzavik, Vladimir et al

in Catheterization and cardiovascular interventions : official journal of the Society for Cardiac Angiography & Interventions (2008), 71(2), 175-83

BACKGROUND: Percutaneous coronary intervention (PCI) of coronary bifurcation lesions remains a subject of debate. Many studies have been published in this setting. They are often small scale and display ... [more ▼]

BACKGROUND: Percutaneous coronary intervention (PCI) of coronary bifurcation lesions remains a subject of debate. Many studies have been published in this setting. They are often small scale and display methodological flaws and other shortcomings such as inaccurate designation of lesions, heterogeneity, and inadequate description of techniques implemented. METHODS: The aim is to propose a consensus established by the European Bifurcation Club (EBC), on the definition and classification of bifurcation lesions and treatments implemented with the purpose of allowing comparisons between techniques in various anatomical and clinical settings. RESULTS: A bifurcation lesion is a coronary artery narrowing occurring adjacent to, and/or involving, the origin of a significant side branch. The simple lesion classification proposed by Medina has been adopted. To analyze the outcomes of different techniques by intention to treat, it is necessary to clearly define which vessel is the distal main branch and which is (are) the side branche(s) and give each branch a distinct name. Each segment of the bifurcation has been named following the same pattern as the Medina classification. The classification of the techniques (MADS: Main, Across, Distal, Side) is based on the manner in which the first stent has been implanted. A visual presentation of PCI techniques and devices used should allow the development of a software describing quickly and accurately the procedure performed. CONCLUSION: The EBC proposes a new classification of bifurcation lesions and their treatments to permit accurate comparisons of well described techniques in homogeneous lesion groups. [less ▲]

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See detailSensitivity of intestinal fibroblasts to TNF-related apoptosis-inducing ligand-mediated apoptosis in Crohn's disease
Reenaers, Catherine ULg; Franchimont, Nathalie; Oury, Cécile ULg et al

in Scandinavian Journal of Gastroenterology (2008), 43

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See detailDistribution of trace elements in organs of six species of cetaceans from the Ligurian Sea (Mediterranean), and the relationship with stable carbon and nitrogen ratios
Capelli, R.; Das, Krishna ULg; De Pellegrini, R. et al

in Science of the Total Environment (2008), 390

Mercury (total and organic), cadmium, lead, copper, iron, manganese, selenium and zinc concentrations were measured in different organs of 6 different cetacean species stranded in an area of extraordinary ... [more ▼]

Mercury (total and organic), cadmium, lead, copper, iron, manganese, selenium and zinc concentrations were measured in different organs of 6 different cetacean species stranded in an area of extraordinary ecological interest (Cetaceans’ Sanctuary of the Mediterranean Sea) along the coast of the Ligurian Sea (North-West Mediterranean). Stable-isotopes ratios of carbon (13C/12C) and nitrogen (15N/14N) were also measured in the muscle. A significant relationship exists between 15N/14N, mercury concentration and the trophic level. The distribution of essential and non-essential trace elements was studied on several organs, and a significant relationship between selenium and mercury, with a molar ratio close to 1, was found in the cetaceans’ kidney, liver and spleen, regardless of their species. High selenium concentrations are generally associated with a low organic to total mercury ratio. While narrow ranges of concentrations were observed for essential elements in most organs, mercury and selenium concentrations are characterised by a wide range of variation. Bio-accumulation and bio-amplification processes in cetaceans can be better understood by comparing trace element concentrations with the stable-isotopes data. [less ▲]

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See detailDifférentes facettes de la maladie de type Alzheimer
Salmon, Eric ULg

in Revue Médicale de Liège (2008), 63

Les maladies de type Alzheimer sont fréquentes. Les efforts réalisés en recherche clinique pour en améliorer le diagnostic précoce sont justifiés par les espoirs de traitements étiologiques. Dès à présent ... [more ▼]

Les maladies de type Alzheimer sont fréquentes. Les efforts réalisés en recherche clinique pour en améliorer le diagnostic précoce sont justifiés par les espoirs de traitements étiologiques. Dès à présent cependant, un diagnostic précoce est justifié par la possibilité de ralentir les conséquences symptomatiques de la maladie. Bien que l’évolution extrêmement variable soit fort préoccupante pour le patient et son entourage, l’objectif thérapeutique est d’adapter les conditions de vie aux capacités du patient (et de ses proches) et de maintenir une qualité de vie optimale. [less ▲]

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See detailImagerie cérébrale de la réflexion sur soi
Salmon, Eric ULg; D'Argembeau, Arnaud ULg; Bastin, Christine ULg et al

in Revue Médicale de Liège (2008), 63

Precise brain regions are activated when a subject gives a judgment on himself. Those are the medial parietal cortex, essentially related to episodic memory processing, and the ventromedial prefrontal ... [more ▼]

Precise brain regions are activated when a subject gives a judgment on himself. Those are the medial parietal cortex, essentially related to episodic memory processing, and the ventromedial prefrontal cortex, recruited for evaluating the personal valence of an information. These regions are not activated in Alzheimer's disease. The decrease of awareness for own deficits in a patient with Alzheimer's disease would depend on a reduction of episodic memory capacities and a worsening of judgment for self significance. [less ▲]

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See detailSeasonal variation in sonic muscles in the fawn cusk-eel Lepophidium profundorum
Nguyen, Thanh Kim; Lin, Hsung; Parmentier, Eric ULg et al

in Biology Letters (2008), 4

The fawn cusk-eel Lepophidium profundorum (Ophidiidae) has an unusual sound-producing system with sexually dimorphic sets of antagonistic muscles. Outside the mating season, the dorsal and ventral muscles ... [more ▼]

The fawn cusk-eel Lepophidium profundorum (Ophidiidae) has an unusual sound-producing system with sexually dimorphic sets of antagonistic muscles. Outside the mating season, the dorsal and ventral muscles are well developed and larger in males than in females, but the tiny intermediate muscles are smaller, suggesting a minor role, if any, in male advertisement call production. We examined summer individuals with more developed gonads and find a fourfold hypertrophy of the intermediate but not the other muscles. This result suggests androgen dependence and an important role in sound production for the intermediate muscle. Even though both sexes gain weight in the summer, the ventral and dorsal muscles in females lose weight, suggesting that sound production is less important in females and that muscle mass may be used to support egg growth. [less ▲]

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See detail3D fully coupled multiphase modelling of Ekofisk reservoir
Ringlet, Clémence; Charlier, Robert ULg; Schroeder, Christian ULg et al

in Shao, Jian-Fu; Burlion, Nicolas (Eds.) Thermo-hydromechanical and chemical Coupling in Geomaterials and Applications (2008)

During reservoir production, the depletion usually induces a compaction of the reservoir layers. To enhance oil recovery, waterflooding operations are generally performed but, in the North Sea chalk ... [more ▼]

During reservoir production, the depletion usually induces a compaction of the reservoir layers. To enhance oil recovery, waterflooding operations are generally performed but, in the North Sea chalk reservoir, they have also induced an additional compaction. This latter phenomenon has a positive impact (improve the ‘Compaction drive’ oil recovery) but endangers the offshore platforms and causes huge extra costs. The coupling effects between mechanical behaviour and fluids flow are thus a key issue in petroleum engineering. Pasachalk program I & II have proposed a constitutive model (referred as Pasachalk model), where the suction is the key parameter to explain the water weakening effect. This model has been used for the modelling of waterflooding experiment on chalk plug and bi-dimensional reservoir. However, as the reservoir modelling is actually a 3D model, the purpose of this paper is to present 3D fully coupled modelling of a simplified Ekofisk reservoir during production and waterflooding phases. In order to exhibit the influence of the constitutive mechanical model, different studies are performed: increasing the complexity of the mechanical model (from an elastic model up to the Pasachalk one with suction effect). The numerical results show the influence of the mechanical law on the oil production and exhibit that only an elasto-plastic law with suction effects succeeds to reproduce compactions during both production and waterflooding. [less ▲]

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See detailRetrieval induced forgetting in normal aging
Hogge, Michaël; Adam, Stéphane ULg; Collette, Fabienne ULg

in Journal of Neuropsychology (2008), 2

The retrieval-induced forgetting (RIF) paradigm was used to assess the integrity of unintentional inhibitory functioning in normal aging. The paradigm was adapted to explore the RIF effect under ... [more ▼]

The retrieval-induced forgetting (RIF) paradigm was used to assess the integrity of unintentional inhibitory functioning in normal aging. The paradigm was adapted to explore the RIF effect under conditions that allow us to differentiate the contribution of intentional and automatic retrieval processes to performance. The results showed the presence of equivalent and significant RIF effects in young and older adults, for both the controlled and automatic retrieval performance. These results suggest that unintentional inhibitory processes are spared in normal aging, and confirm that RIF effect is independent of the kind of memory processes needed to perform the task. [less ▲]

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See detailGoodness-of-fit tests for censored regression based on artificial data points
González Manteiga, Wenceslao; Heuchenne, Cédric ULg; Sánchez Sellero, Cesar

Report (2008)

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See detailFormation mechanism of Y-junctions in arrays of multi-walled carbon nanotubes
Zilli, Dario; Blacher, Silvia ULg; Cukierman, Ana Lea et al

in Colloids and Surfaces A : Physicochemical and Engineering Aspects (2008), 327(1-3), 140-143

Transmission electron microscopy of arrays of multi-walled carbon nanotubes reveals the presence of numerous Y-junctions. The diameter distributions of the samples are found to be bimodal, with one mode ... [more ▼]

Transmission electron microscopy of arrays of multi-walled carbon nanotubes reveals the presence of numerous Y-junctions. The diameter distributions of the samples are found to be bimodal, with one mode corresponding to the branches and the other mode to the trunk of the Y-junctions. The analysis of the micrographs shows that the junctions form via the merger of metal particles during the tip-growth of the tubes. (C) 2008 Elsevier B.V. All rights reserved. [less ▲]

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See detailA SYBR Green RT-PCR assay in single tube to detect human and bovine noroviruses and control for inhibition.
Scipioni, Alexandra ULg; Mauroy, Axel ULg; Ziant, Dominique ULg et al

in Virology journal (2008), 5

BACKGROUND: Noroviruses are single-stranded RNA viruses belonging to the family Caliciviridae. They are a major cause of epidemic and sporadic gastroenteritis in humans and clinical signs and lesions of ... [more ▼]

BACKGROUND: Noroviruses are single-stranded RNA viruses belonging to the family Caliciviridae. They are a major cause of epidemic and sporadic gastroenteritis in humans and clinical signs and lesions of gastroenteritis were reported in bovines. Due to their genetic proximity, potential zoonotic transmission or animal reservoir can be hypothesized for noroviruses. RT-PCR has become the "gold standard" for the detection of noroviruses in faecal and environmental samples. With such samples, the control for inhibition of the reaction during amplification and detection is crucial to avoid false negative results, which might otherwise not be detected. The aim of the reported method is to detect, with a SYBR Green technology, a broad range of noroviruses with a control for inhibition. RESULTS: A SYBR Green real-time RT-PCR assay was developed making use of a foreign internal RNA control added in the same tube. This assay is able to detect human and bovine noroviruses belonging to genogroups I, II and III and to distinguish between norovirus and internal control amplicons using melting curve analysis. A 10-fold dilution of samples appears to be the method of choice to remove inhibition. This assay was validated with human and bovine stool samples previously tested for norovirus by conventional RT-PCR. CONCLUSION: This SYBR Green real-time RT-PCR assay allows the detection of the most important human and bovine noroviruses in the same assay, and avoids false negative results making use of an internal control. Melting curves allow the discrimination between the internal control and norovirus amplicons. It gives preliminary information about the species of origin. The sensitivity of the developed assay is higher than conventional RT-PCR and a 10-fold dilution of samples showed a better efficiency and reproducibility to remove RT-PCR inhibition than addition of bovine serum albumin. [less ▲]

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See detailInfluence of evaporation and seepage on the convergence of a ventilated cavity
Gerard, Pierre ULg; Charlier, Robert ULg; Chambon, René et al

in Water Resources Research (2008), 44

In the design of nuclear waste disposals, an important topic concerns the development of an excavated damage zone, where permeability increases. A correct numerical prediction of the coupled processes ... [more ▼]

In the design of nuclear waste disposals, an important topic concerns the development of an excavated damage zone, where permeability increases. A correct numerical prediction of the coupled processes occurring during excavation is therefore needed. In this paper, a nonclassical hydraulic boundary condition is described. It mixes two modes of water exchanges in partial saturation: seepage and evaporation flows. Seepage flow avoids unphysical water inflow into the rock mass, which might be obtained with usual boundary condition in dilatant geomaterial. Evaporation flows enable the thermodynamical equilibrium between air relative humidity in the cavity and in the rock mass. The numerical modeling of a cavity excavation in dilatant geomaterial is carried out. The results show the influence of the hydraulic boundary condition on the convergence of the cavity. Depending on the value of the transfer coefficient, the proposed numerical model can recover the results obtained with an imposed atmospheric pressure or suction at the cavity wall. The determination of the mass transfer coefficient is thus needed and can be achieved through drying experiments or can be estimated thanks to in situ measurements. [less ▲]

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See detailWalkabout - Paris by Clack
Havelange, Carl ULg; Strivay, Lucienne ULg

Book published by Hapax (2008)

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