References of "2011"
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See detailChloroplastic and mitochondrial metal homeostasis.
Nouet, Cécile ULg; Motte, Patrick ULg; Hanikenne, Marc ULg

in Trends in Plant Science (2011), 16(7), 395-404

Transition metal deficiency has a strong impact on the growth and survival of an organism. Indeed, transition metals, such as iron, copper, manganese and zinc, constitute essential cofactors for many key ... [more ▼]

Transition metal deficiency has a strong impact on the growth and survival of an organism. Indeed, transition metals, such as iron, copper, manganese and zinc, constitute essential cofactors for many key cellular functions. Both photosynthesis and respiration rely on metal cofactor-mediated electron transport chains. Chloroplasts and mitochondria are, therefore, organelles with high metal ion demand and represent essential components of the metal homeostasis network in photosynthetic cells. In this review, we describe the metal requirements of chloroplasts and mitochondria, the acclimation of their functions to metal deficiency and recent advances in our understanding of their contributions to cellular metal homeostasis, the control of the cellular redox status and the synthesis of metal cofactors. [less ▲]

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See detailIdentification of differential item functioning in multiple-group settings: A multivariate outlier detection approach
Magis, David ULg; De Boeck, Paul

in Multivariate Behavioral Research (2011), 46

This paper focuses on the identification of differential item functioning (DIF) when more than two groups of examinees are considered. We propose to consider items as elements of a multivariate space ... [more ▼]

This paper focuses on the identification of differential item functioning (DIF) when more than two groups of examinees are considered. We propose to consider items as elements of a multivariate space, where DIF items are outlying elements. Following this approach, the situation of multiple groups is a quite natural case. A robust statistics technique is proposed to identify DIF items as outliers in the multivariate space. For low dimensionalities, up to two three groups, also a simple graphical tool is derived. We illustrate our approach with a re-analysis of data from Kim, Cohen, and Park (1995) on using calculators for a mathematics test. [less ▲]

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See detailcompte rendu de : Philip Hardie, Lucretian Receptions. History, The Sublime, Knowledge
Rochette, Bruno ULg

in Phoenix (2011), 65(1-2), 176-179

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See detailL'image du mois. Le comble du coiffeur: avoir un poil dans la main.
CAUCANAS, Marie ULg; FRANCHIMONT, Claudine ULg; PIERARD, Gérald ULg

in Revue Médicale de Liège (2011), 66(4), 177-8

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See detailNote synthétique sur l'évaluation et le calcul de la vulnérabilité des ménages au Niger : février 2011
Andres, Ludovic ULg; Lebailly, Philippe ULg

Report (2011)

L’analyse de la vulnérabilité alimentaire suscite une attention toute particulière des bailleurs de fond. En effet, depuis 1990, l’analyse et l’évaluation de celle-ci permet aux différentes institutions ... [more ▼]

L’analyse de la vulnérabilité alimentaire suscite une attention toute particulière des bailleurs de fond. En effet, depuis 1990, l’analyse et l’évaluation de celle-ci permet aux différentes institutions nationales et internationales présentes au Niger d’élaborer leurs stratégies, de cibler les populations ou zones bénéficiaires de leurs interventions ainsi que de prévenir et gérer les crises alimentaires. Cependant, les nombreuses crises alimentaires chroniques du Niger (1996-1997, 2001, 2004-2005, 2009-2010) suscitent néanmoins un certain questionnement quant à l’efficacité et l’efficience de cette évaluation. Cette note décrira certaines méthodologies d’évaluation de la vulnérabilité alimentaire les plus usitées au Niger. Au total, trois méthodologies ont été caractérisées, celle de la Cellule de Coordination du Système d’Alerte Précoce (CC/SAP), de certains Partenaires Techniques et Financiers (Save The Children, Action Contre la Faim, …) et du CC/SAP et de l’Institut National de la Statistique du Niger (INS-Niger). Cette description permettra de mieux cerner les spécificités de chacune d’elles et d’élaborer certaines remarques et recommandations. Ce document introduira, tout d’abord, le concept de vulnérabilité repris dans la littérature. Ensuite, il décrira les différentes méthodologies de calcul et d’évaluation de la vulnérabilité utilisées au Niger. Enfin, ces méthodologies seront analysées et critiquées en vue de présenter des propositions d’améliorations. Il en ressort que le niveau d’analyse de la vulnérabilité doit être affiné d’un point de vue départemental et communal. Il est essentiel de réaliser une distinction entre les ménages urbains et ruraux étant donné la diversité des stratégies opérées par ces ménages. L’évaluation de la vulnérabilité des ménages pastoraux et/ou transhumants devrait être repensée pour améliorer la prise en compte de ceux-ci. La recommandation principale de cette note est d’augmenter le nombre de ménages de l’échantillon d’analyse dans le but de mieux caractériser la vulnérabilité des ménages urbains, ruraux, pastoraux et de produire des indices de vulnérabilité par commune. [less ▲]

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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 detailInventaire des archives de la Société intercommunale de Ravitaillement de la Province de Liège (1916-1921)
Delvaux, Anne-Catherine ULg

Book published by Archives générales du Royaume (2011)

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See detailCO2 valorization by means of dielectric barrier discharge
Machrafi, Hatim ULg

in Journal of Physics: Conference Series (2011), 275(1, art_number=012016),

As atmospheric pollution is causing several environmental problems it is incumbent to reduce the impact of pollution on the environment. One particular problem is the production of CO2 by many transport ... [more ▼]

As atmospheric pollution is causing several environmental problems it is incumbent to reduce the impact of pollution on the environment. One particular problem is the production of CO2 by many transport and industrial applications. Instead of stocking CO2 and instead of being a product, it can be used as a source. The case considered is the CO2 reformation of methane producing hydrogen and CO. It is an endothermic reaction, for which the activation barrier needs to be surpassed. This can be done efficiently by the method of Dielectric Barrier Discharge. The process relies on the collision of electrons, which are accelerated under an electrical field that is created in the discharge area. This leads to the formation of reactive species, which facilitate the abovementioned reaction. This study is performed using a Matlab program with the Reaction Engineering module in COMSOL (with an incorporated kinetic mechanism) in order to model the discharge phase. Then COMSOL (continuity and Navier-Stokes equations) is used to model the flow in the post-discharge phase. The results showed that both a 2D and 3D model can be used to model the chemical-plasma process. These methods need strongly reduced kinetic mechanism, which in some cases can cause loss of precision. [less ▲]

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See detailModulating effects of acepromazine on the reactive oxygen species production by stimulated equine neutrophils
Sandersen, Charlotte ULg; Mouithys-Mickalad, Ange ULg; de la Rebière de Pouyade, Geoffroy ULg et al

in Veterinary Anaesthesia & Analgesia (2011), 38

To investigate the effect of acepromazine (ACP) on reactive oxygen species (ROS) production by stimulated equine neutrophils.

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See detailThe utilization of polysaccharides by heterotrophic bacterioplankton in the Bay of Biscay (North Atlantic Ocean)
Piontek, Judith; Händel, Nicole; De Bodt, Caroline et al

in Journal of Plankton Research (2011), 33(11), 1719-1735

This study investigates the turnover of polysaccharides by heterotrophic bacterioplankton in the northern Bay of Biscay, a productive marine system on the shelf-break of the temperate Atlantic Ocean ... [more ▼]

This study investigates the turnover of polysaccharides by heterotrophic bacterioplankton in the northern Bay of Biscay, a productive marine system on the shelf-break of the temperate Atlantic Ocean. Field studies were conducted along the shelf-break south of Ireland and west of France (47° 07' 83'' N, 6° 92' 01'' E and 51° 34' 42'' N, 10° 49' 95'' E) during the development of phytoplankton blooms in late spring. Bacterial biomass production (BBP) near the surface ranged from 0.5 to 27.4 nmol C L-1 h-1 in both years. A direct relationship between BBP and the concentration of total polysaccharides strongly suggests the dependence of bacterial growth on the availability of semi-labile organic matter. Concentrations of combined glucose as well as rate constants of extracellular glucosidase activity and glucose uptake were determined to estimate the actual carbon fluxes from bacterial polysaccharide turnover. Results reveal that the degradation of polysaccharides n the upper 100 m of the water column sustained on average a glucose flux of 2.6 mmol C m-2 d-1 i that was available for bacterial uptake. The mean turnover time for polysaccharides was 170 and 165 days for alpha- and beta-glycosidic linked polymers, respectively. Free glucose, the labile hydrolysate of polysaccharides, had a mean turnover time of 4.5 days and supported 2.2 to 18.4% of BBP. The incorporation of glucose into bacterial biomass was stimulated by the availability of inorganic nitrogen. Overall, our results demonstrate that the bacterial recycling of polysaccharides in the Bay of Biscay generates a relevant flux of organic carbon in microbial food-webs and biogeochemical processes. [less ▲]

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See detailGenetic variation among the geographic population of the grain aphid, Sitobion avenae (Hemiptera: Aphididae) in China inferred from mitochondrial COI gene sequence
Xu, Zhao-Huan; Chen, Julian; Cheng, Deng-Fa et al

in Agricultural Sciences in China (2011), 10(7), 1041-1048

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See detail“Josephine Baker: articulation et altérité transatlantiques.”
Bada, Valérie ULg

in de Buron-Brun, Bénédicte (Ed.) Altérité, identité, interculturalité. Perceptions et représentations de l’étranger en Europe et dans l’Arc Atlantique (2011)

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See detailIntroduction aux applications des ondelettes
Charles, Catherine ULg

Report (2011)

Cette note fait suite à une note antérieure. Son objectif est de faire prendre conscience au lecteur de la large étendue d'applications des ondelettes. Elle se découpe en deux parties. La première ... [more ▼]

Cette note fait suite à une note antérieure. Son objectif est de faire prendre conscience au lecteur de la large étendue d'applications des ondelettes. Elle se découpe en deux parties. La première illustre la théorie des ondelettes aux moyens d'applications tournées vers la statistique. La deuxième se tourne vers les applications en traitement du signal et de l'image. [less ▲]

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See detailEFFECTS OF SUBLIMINAL PRIMING ON NONCONSCIOUS GOAL PURSUIT AND EFFORT-RELATED CARDIOVASCULAR RESPONSE
Capa, Rémi ULg; Cleeremans, Axel; Bustin, Gaëlle ULg et al

in Social Cognition (2011), 29(4), 430-444

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See detailPerspectives on genome-wide multi-stage family-based association studies.
Van Steen, Kristel ULg

in Statistics in Medicine (2011), 30(18), 2201-2221

With the establishment of large consortiums of researchers, genome-wide association (GWA) studies have become increasingly popular and feasible. Although most of these association studies focus on ... [more ▼]

With the establishment of large consortiums of researchers, genome-wide association (GWA) studies have become increasingly popular and feasible. Although most of these association studies focus on unrelated individuals, a lot of advantages can be exploited by including families in the analysis as well. To overcome the additional genotyping cost, multi-stage designs are particularly useful. In this article, I offer a perspective view on genome-wide family-based association analyses, both within a model-based and model-free paradigm. I highlight how multi-stage designs and analysis techniques, which are quite popular in clinical epidemiology, can enter GWA settings. I furthermore discuss how they have proven successful in reducing analysis complexity, and in overcoming one of the most cumbersome statistical hurdles in the genome-wide context, namely controlling increased false positives due to multiple testing. [less ▲]

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See detailOn the Origin of Model Relations among Transverse-Momentum Dependent Parton Distributions
Lorce, Cédric ULg; Pasquini, B.

in Physical Review. D, Particles, Fields, Gravitation, and Cosmology (2011), D84

Transverse-momentum dependent parton distributions (TMDs) are studied in the framework of quark models. In particular, quark-model relations among TMDs are reviewed, elucidating their physical origin in ... [more ▼]

Transverse-momentum dependent parton distributions (TMDs) are studied in the framework of quark models. In particular, quark-model relations among TMDs are reviewed, elucidating their physical origin in terms of the quark-spin structure in the nucleon. The formal aspects of the derivation of these relations are complemented with explicit examples, emphasizing how and to which extent the conditions which lead to relations among TMDs are implemented in different classes of quark models. [less ▲]

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