References of "Scientific congresses and symposiums"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailDiscrimination of two geographically distinct populations of sea bass Dicentrarchus labrax, using stable isotopic signatures of mercury (δ202Hg, Δ199Hg)
Cransveld, Alice ULg; Amouroux, David; Koutrakis, Emmanuil et al

Poster (2014, May 15)

Despite the reduction of mercury (Hg) emissions in Europe in the last decades, Hg emissions are increasing worldwide and concentrations found in some marine predators remain high. This raises questions on ... [more ▼]

Despite the reduction of mercury (Hg) emissions in Europe in the last decades, Hg emissions are increasing worldwide and concentrations found in some marine predators remain high. This raises questions on mercury's biogeochemical cycle at both local and global scale. In the present work, we investigate the possibility to use mercury isotopic signature in fish as a tool to discriminate different polluted areas and potential pollution sources. Indeed, Hg can exhibit both mass-dependent (MDF) and mass-independent fractionation (MIF). While MDF may occur during biological cycling inter alia and could be used to understand bioaccumulation processes, MIF provides a unique fingerprint of specific chemical pathways, such as photochemical transformations. In this context, information provided by Hg isotopes would help to improve environmental management strategies. A preliminary set of four and ten juvenile common sea bass, Dicentrarchus labrax were collected from the North Sea and the Aegean Sea respectively. T-Hg was analysed by direct mercury analyser (DMA), speciation by gas chromatography inductively coupled plasma mass spectrometer (GC-ICP-MS) and Hg isotope analysis were performed using cold vapour generation with multicollector ICP-MS. Total Hg concentrations in all tissues were higher in individuals from the North Sea ( Hgtot muscle=1,14 ± 0,48 mg.kg-1 dw) than from Greece (0,60 ± 0,06 mg.kg-1 dw). Speciation analysis shows that MeHg is the predominant form of Hg in muscle (89% MeHg on average) but not in liver (51% MeHg on average). Isotopic mass dependent values (δ202Hg) values were always higher in muscle than in liver and related to Hg species distribution. For mass independent isotopic signature, sea bass from the Aegean Sea had a systematically higher Δ199Hg value than individuals from the North sea (e.g.: 0,56 ± 0,05‰ and 0,32 ± 0,06‰ respectively in muscle). While mass dependent isotopic signature probably reflects some internal Hg metabolism, mass independent isotopic signature seems definitely site dependent. Such isotopic discrimination might be in agreement with difference in both mercury sources and cycling in the North and Aegean Seas. These preliminary results indicate that Hg isotopes may thus help to discriminate fish from different areas. This promising outcome must be further confirmed by extending the number of individuals and locations to be investigated. [less ▲]

Detailed reference viewed: 19 (0 ULg)
Full Text
See detailFlowering Goes Underground
Bouché, Frédéric ULg; Lobet, Guillaume ULg; D'Aloia, Maria ULg et al

Conference (2014, May 15)

Flowering is a crucial step in plant life cycle and is therefore tightly controlled by both environmental and endogenous cues. The involvement of the aerial organs of the plant in the molecular mechanisms ... [more ▼]

Flowering is a crucial step in plant life cycle and is therefore tightly controlled by both environmental and endogenous cues. The involvement of the aerial organs of the plant in the molecular mechanisms controlling floral transition has been extensively documented while the participation of the roots remains poorly investigated. However, the induction of flowering by photoperiod involves systemic signals that move in the phloem from leaves to sinks, and hence presumably reach the roots. We therefore performed a transcriptomic analysis of the roots during the induction of flowering in Arabidopsis thaliana and indeed identified a large number of differentially expressed genes. A reverse genetic approach further confirmed the pleiotropic effects of flowering time genes on root architecture. [less ▲]

Detailed reference viewed: 15 (2 ULg)
Full Text
See detailThe effects of flowering signals on root architecture in Arabidopsis
Mathieu, Laura ULg; Lobet, Guillaume ULg; Périlleux, Claire ULg

Poster (2014, May 15)

Roots are responsible for water and nutrient uptake and hence are critical to sustain the whole plant life cycle. This study aims at characterizing how root development is affected by flowering. We ... [more ▼]

Roots are responsible for water and nutrient uptake and hence are critical to sustain the whole plant life cycle. This study aims at characterizing how root development is affected by flowering. We therefore focused on the effects of systemic signals produced in the leaves at floral transition, namely the proteins FLOWERING LOCUS T (FT) and TWIN SISTER OF FT (TSF), on root growth and branching. These proteins act in the shoot apical meristem as potent promoters of flowering [1] but their effects in other parts of the plant are still unknown. [less ▲]

Detailed reference viewed: 13 (0 ULg)
Full Text
See detailDevelopment of an analytical method to detect simultaneously bisphenols using a multiplexed surface-enhanced Raman scattering quantitative approach
De Bleye, Charlotte ULg; Dumont, Elodie ULg; Sacre, Pierre-Yves ULg et al

Poster (2014, May 15)

Over the last decade, bisphenol A (BPA) attracted a lot of attention. This molecule, commonly used as a precursor to produce epoxy-resin and plastics, is an endocrine disruptor presenting an estrogenic ... [more ▼]

Over the last decade, bisphenol A (BPA) attracted a lot of attention. This molecule, commonly used as a precursor to produce epoxy-resin and plastics, is an endocrine disruptor presenting an estrogenic activity [1]. Despite its health toxicity, BPA is present in a broad variety of consumer goods released from plastic bottles and packaging for example. Since the discovery of its adverse health effect of BPA, the manufacturers tend to use structural analogues of BPA such as BPS, BPF and BPB to produce plastic materials [2]. However, the health safety of these molecules is still not demonstrated. Currently, bisphenols are actively researched and quantified using solid phase extraction and chromatography techniques which are time and solvents consuming. Therefore, it could be very interesting to quantify simultaneously bisphenols using a fast and “green” technique. Surface-enhanced Raman scattering (SERS) exalts dramatically the Raman scattering of molecules adsorbed or very closed to metallic surface enabling to detect very low amounts of analytes while keeping the structural information obtained from the spectrum which is very interesting to consider multiplexed analyses [3-4]. Moreover, SERS, which is a solvent free and fast acquisition technique, is an attractive tool in “Green Chemistry” [5]. In this context, the development of a multiplexed quantitative approach to detect bisphenol was considered. Silver nanoparticles (AgNps) were selected as SERS substrate and their functionalization was investigated taking into account the weak affinity of phenolic molecules for gold and silver surface [6]. Pyridine was selected as surface modifier and allowed to attract bisphenols around metallic surface thanks to hydrophobic interaction and hydrogen bonds [7]. Afterwards, the SERS samples preparation was optimized playing on the concentrations of pyridine and aggregating agent used to get the nanoparticles closer to each other which promotes the SERS effect. Tap water samples were spiked with different concentration of BPA from 5 ppb to 1000 ppb and analyzed using the optimized SERS sample preparation. A good linearity of the response was observed and a calibration curve with coefficient of determination (R2) of 0.9922 was obtained by plotting the intensity of a principal band of BPA versus the concentration. This last step was repeated using BPB as analyte and a calibration curve with a R2 of 0.9991 was obtained for the same range of concentration using a specific band intensity of BPB. Finally, tap water samples were spiked with different concentrations of BPA and BPB simultaneously and analyzed using SERS and it was possible to detect selectively the two molecules thanks to specific bands and a good linearity of the response was observed for both. To conclude, promising results were obtained which pave the way to “green” multiplexed quantitative analyses of very low concentrated analytes using SERS. References: [1] J.-H. Kang et al., Toxicology 226 (2006) 79-89 [2] C. Liao et al., J. Agric. Food Chem. 61 (2013) 4655-4662 [3] K. Kneipp et al., Chem. Rev. 99 (1999) 2957-2975. [4] R.F. Aroca et al., Adv.Colloid Interface Sci. 116 (2005) 45-61. [5] C. De Bleye et al., Talanta 116 (2013) 899-905. [6] X.X. Han et al., Anal. Chem., 83 (2011) 8582-8588. [7] B. San Vicente et al., Anal. Bioanal. Chem. 380 (2004) 115-122. [less ▲]

Detailed reference viewed: 27 (5 ULg)
Full Text
See detailMédecine & sport de haut niveau
Kaux, Jean-François ULg

in Sport et Médecine : droit au but (2014, May 15)

L’engouement pour les activités sportives demeure croissant auprès du grand public grâce à toute une série d’activités sportives novatrices (Zumba, Kaerobic, etc…) et de programmes de remise en forme ... [more ▼]

L’engouement pour les activités sportives demeure croissant auprès du grand public grâce à toute une série d’activités sportives novatrices (Zumba, Kaerobic, etc…) et de programmes de remise en forme (« Je cours pour ma forme », etc…), bénéfiques pour la santé. Cependant, les sportifs de haut niveau, professionnels ou non, valides ou handicapés, représentant l’excellence sportive, reconnus par le code et la charte du sport de haut niveau, ne représentent qu’une infime partie de la totalité des sportifs. Le sport de haut niveau repose sur des critères bien établis: la reconnaissance du caractère de haut niveau des disciplines sportives ; les compétitions de références (jeux olympiques, championnats d’Europe et du Monde…) ; la liste des sportifs de haut niveau ; les filières d’accès au sport de haut niveau. Les sportifs pratiquant au meilleur niveau bénéficient généralement de prédispositions physiques, adéquates au sport pratiqué. Cependant, sans entrainement spécifique (au sport pratiqué), ils ne pourraient pas atteindre ce niveau. Le médecin, travaillant dans l’ombre de ces sportifs, est là pour veiller sur leur santé, développer des stratégies de prévention lésionnelle et les soigner en cas de nécessité. Même s’il a la possibilité de superviser médicalement les compétitions sportives « en première loge », il est également souvent sous la pression arbitrale, des médias, des coaches, des présidents, des sportifs eux-mêmes… Au cours de sa carrière, le sportif risque de se blesser plus ou moins gravement, et se voit obligé de quitter la compétition pour laquelle il s’est préparé durant de nombreuses semaines voire des mois ou des années… Dans ce cas, il sera pris en charge par toute une équipe (kiné, chirurgien, préparateur physique, psychologue…) travaillant en synergie afin de le rétablir au plus vite et de retrouver son plus haut niveau. Avant le retour en compétition, une réathlétisation demeure indispensable. Celle-ci correspond à la reprise d’activité physique, comprenant : toute la phase de réadaptation à l’exercice la phase de transition entre les soins et la reprise de l’entraînement. Il s’agit d’un processus nécessaire à la prévention des blessures et à l’adaptation de l’organisme à un programme d’entraînement poussé. Cependant, il se peut que cette période de l’entraînement soit négligée en raison d’un manque de temps en vue d’un objectif trop proche, majorant le risque de récidive ou de nouvelle blessure. Le sportif de haut niveau se doit de garder une hygiène de vie parfaite, en ayant une alimentation équilibrée, et dénuée de toxique (alcool, drogue…) et en respectant des périodes de repos nécessaires entre les différentes phases d’activité physique. De plus, afin d’améliorer ses performances sportives, la préparation physique (endurance, résistance, force musculaire, souplesse…) et l’entrainement spécifique à chaque sport (technique, tactique, adresse et précision…) demeurent indispensables. Dès lors, la tentation de les améliorer artificiellement existe. En effet, le dopage consiste à absorber des substances ou à utiliser des actes médicaux afin d’augmenter artificiellement ses capacités physiques et/ou mentales. Or, l’utilisation de tout médicament devrait être limitée à des indications médicalement justifiées. Le code mondial anti-dopage est régit par l’Agence Mondiale Antidopage (AMA / WADA ; www.wada-ama.org ou www.dopage.be) et la liste des produits dopants est revue chaque année. [less ▲]

Detailed reference viewed: 34 (5 ULg)
Full Text
Peer Reviewed
See detailImproving soil conservation through an adapted tillage: experience from the cultivation of potatoes in Bamiléké's hills of Cameroon
Djoukeng, Henri Grisseur ULg; Tankou, Christopher Mubeteneh; Degré, Aurore ULg

Poster (2014, May 14)

The western highlands of Cameroon are an area where the population density and growth rates are the highest in the country. In this region, the main activity is agriculture, and rivers are the main source ... [more ▼]

The western highlands of Cameroon are an area where the population density and growth rates are the highest in the country. In this region, the main activity is agriculture, and rivers are the main source of safe drinking water. Lacks of arable land and especially against very complex land tenure, farmers are increasingly exploiting the hills (9-30 % slope) for the production of vegetable crops, mainly potatoes. The methods of preparation of soil found there are ridging in the direction of the slope and the culture dish. These practices promote erosion by runoff, generally compromises the multiple functions of agriculture, and in particular the environmental function (soil degradation, pollution and silting up of rivers) and the production function (incomes). In order to ensure soil stability and maintain good water quality of rivers, we put it up a new way of preparing the ground: the tied ridging. To quantify the effectiveness of the latter, we conducted tests of erosion by runoff with Wischmeier’s plots on the most exploited slopes, namely 11% and 29%. The run-off water and sediments were collected per plot and per block after every rain. The first analyses show that there is a significant difference between the culture dish or ridging along the slope and tied ridging. The major constraint of this practice lies in the increase of about 17% of the labor. Tied ridging reported losses in average land 16% lower compared with the ridging in the direction of the slope and 22% compared with the culture dish, he also presented higher yields of 65 % compared with the culture dish and the ridging in the direction of the slope. Despite the hardship, the test results have convinced the participants and some curious farmers which have adopted the technology during the next growing season. [less ▲]

Detailed reference viewed: 19 (11 ULg)
Full Text
See detailBelgian Grasshoppers: A Nutritious Food Source
Paul, Aman ULg; Frederich, Michel ULg; Blecker, Christophe ULg et al

Poster (2014, May 14)

Rapid urbanization and rising economies are creating shifts in the composition of global food demand, so it is necessary to explore new sources of food with better nutritional profile. Among the ... [more ▼]

Rapid urbanization and rising economies are creating shifts in the composition of global food demand, so it is necessary to explore new sources of food with better nutritional profile. Among the alternative food that exists are the grasshoppers, about 80 species of which are consumed worldwide. Grasshoppers are not only rich source of proteins and lipids but also some important minor component like vitamins and minerals. Edible species of grasshopper in Belgium were identified and attempts were made for the lab rearing of meadow grasshopper (Chorthippus parallelus). The lipids as well as protein contents of meadow grasshopper (Chorthippus parallelus) & long winged conehead (Conocephalus discolor) were investigated. The fatty acid compositions of these two species were determined by gas chromatography. Some of the physicochemical properties of the lipids extracted were also analyzed. These two grasshopper species could be really nutritious source of food. [less ▲]

Detailed reference viewed: 52 (11 ULg)
See detailCarbon monoxide retrieved from ground based FTIR remote sensing in the mid-­‐ and near infrared spectral region
Petri, Christof; Blumenstock, Thomas; Hase, Frank et al

Conference (2014, May 14)

Detailed reference viewed: 10 (2 ULg)
See detailLes PPP comme nouveau mode de régulation du marché de l'emploi
Remy, Céline ULg

Conference (2014, May 14)

Detailed reference viewed: 15 (0 ULg)
Full Text
Peer Reviewed
See detailAdaptation to beach erosion in the African coastal cities: from the procrastination by the Government to the forced migration of the most precarious population. The case of Cotonou, Benin
Ozer, Pierre ULg; De Longueville, Florence ULg; Hountondji, Yvon Carmen et al

Poster (2014, May 14)

This analysis shows that the current impacts of geomorphological changes result mainly from the sum of human activities. However, it is necessary to consider the risk of coastal erosion and forced ... [more ▼]

This analysis shows that the current impacts of geomorphological changes result mainly from the sum of human activities. However, it is necessary to consider the risk of coastal erosion and forced migration (of mostly poor people) in the coming decades with the amplification of sea level rise due to global warming. [less ▲]

Detailed reference viewed: 28 (3 ULg)
See detailQuand les députés vont au cinéma. Le Prix Lux et ses paradoxes.
Hamers, Jérémy ULg

Conference (2014, May 13)

Detailed reference viewed: 12 (0 ULg)
Full Text
Peer Reviewed
See detailMicroplastics contamination in two planktivorous and commercial fish species
Collard, France ULg; Parmentier, Eric ULg; Das, Krishna ULg

Poster (2014, May 13)

Plastic pollution is a huge environmental concern and affects each marine ecosystem. Plastics are produced by millions of tonnes each year in the world and finally accumulate in oceans. They adsorb many ... [more ▼]

Plastic pollution is a huge environmental concern and affects each marine ecosystem. Plastics are produced by millions of tonnes each year in the world and finally accumulate in oceans. They adsorb many persistent organic pollutants, cause external and internal wounds and provoke blockage of the digestive tract of marine mammals, birds and turtles. Plastics can also threaten marine organisms of small size class in the same way by fragmenting in smaller parts that result in microplastics of less than five millimetres. These microplastics are of the same order of magnitude than plankton and can thus be ingested by filter-feeders, suspension-filters and planktivorous organisms such as fish. Few studies deal with microplastics ingestion by fish and even less by commercial fish species. The herring (Clupea harengus) and the sardine (Sardina pilchardus) were respectively the third and the eighth most caught fish species in the world in 2009. We focused our research on these two species which are of economic importance. We sampled around thirty individuals of each species in the Channel and in the North Sea in January 2013. The stomach contents were digested by sodium hypochlorite and then analyzed. Microplastics were characterized by size, colour and shape. The results of these analyses will highlight the need for studies about microplastics ingestion by planktivorous species. [less ▲]

Detailed reference viewed: 87 (2 ULg)
Full Text
Peer Reviewed
See detailThe small Heat Shock Proteins (sHSPs) response following eccentric exercise
Hody, Stéphanie ULg

Conference (2014, May 12)

Detailed reference viewed: 14 (1 ULg)
Full Text
Peer Reviewed
See detailTrace element bioaccumulation in rope-grown Mytilus galloprovincialis: knowledge update
Richir, Jonathan ULg; Gobert, Sylvie ULg

Poster (2014, May 12)

Numerous trace elements (TEs) can be considered as potential pollutants of the environment, their mining productions and industrial uses increasing worldwide. Their monitoring can be achieved through the ... [more ▼]

Numerous trace elements (TEs) can be considered as potential pollutants of the environment, their mining productions and industrial uses increasing worldwide. Their monitoring can be achieved through the use of bioindicator species, such as the Mediterranean mussel Mytilus galloprovincialis (Lamarck, 1819). That species has been widely used to monitor the chemical pollution of coastal ecosystems by Cr, Ni, Cu, Zn, Cd, Pb, As, Ag and V. Conversely, environmental levels of Be, Al, Fe, Mn, Co, Se, Mo, Sn, Sb and Bi have been little or not monitored so far in mussel watch programs. Bioaccumulation processes of these 19 TEs in rope-grown M. galloprovincialis purchased from a salt pond with good chemical water quality were thus investigated in the present study. Mussels efficiently accumulated the 19 studied TEs. Bioaccumulation processes were driven by numerous mutually dependent biological parameters such as the mussel size and flesh weight, the sex and the reproductive status and the body compartment considered. TE bioaccumulation was a power function of the mussel soft body dry weight; total contents linearly increased with the shell length. Small-size mussels overall concentrated more TEs, with a high interindividual variability, consequently influencing the modelling of their bioaccumulation in the whole rope population. Although a large range of rope-grown M. galloprovincialis sizes can be used for monitoring purposes, one will thus take care not to use extreme size individuals. The influence of gametogenesis in determining female body higher TE concentrations prior to spawning could not be neglected and varied depending on the element. TEs were preferentially accumulated in the hepatopancreas, except for Zn, Se, Cd and Mo, more concentrated in gills. Gametogenesis did not influence TE distribution between body compartments, but likely diluted their concentrations as a direct consequence of massive reproductive tissue production. So, results from the present study underlined the potential use of M. galloprovincialis in the biomonitoring of numerous little studied TEs and gave some insights into the decisive role played by some relevant biological parameters in bioaccumulation processes of the 19 investigated TEs in rope-grown mussels. [less ▲]

Detailed reference viewed: 14 (3 ULg)
Full Text
Peer Reviewed
See detailModeling of a glass mineral wool process in view of Life Cycle Analysis
Gerbinet, Saïcha ULg; Léonard, Angélique ULg; Briard, Vincent

Poster (2014, May 12)

In line with the growing concern about the environmental impact of materials in the building sector, Knauf Insulation, a glass wool producer, is performing environmental impact assessment of its products ... [more ▼]

In line with the growing concern about the environmental impact of materials in the building sector, Knauf Insulation, a glass wool producer, is performing environmental impact assessment of its products through LCA. Knauf Insulation has several glass wool factories in Europe that produce various products, and for a specific market, the same product can be produced in several factories. As the plants that produce glass wool work with similar pathways, a generic model for LCA usable for every plant and every glass wool product has been designed. Moreover, combination of different factories is also possible. The general principle of glass wool production is the following: the raw materials, sand, limestone, soda ash, borax, sodium carbonate, as well as recycled off-cuts from the production process, are weighed and mixed. Knauf Insulation also uses a large amount of recycled glass (cullet). The mix is sent to a furnace at high temperature (1350°C). The melted material is then fiberized and the binder is added, a process called forming. Knauf Insulation uses a special binder with ECOSE Technology, a new and formaldehyde-free binder. The wool fibers are collected, by suction, on a conveyor belt, and the mattress then goes through the curing oven. For some product a facing is added. Finally the product is compressed and packed. The model, implemented in GaBi 6, is made as generic as possible by including, for each step, all the raw materials that can be used in one of the factories as well as all the energy sources. Parameters allow to define the amount of each raw material consumed, therefore the model can be adapted to any factory simply by setting these parameters accordingly. This also simplifies the data collection, since the template is the same for all the factories, it can be supported by data collection tools already existing. A part of the model is dedicated to weighting between factories, so a combination of factories can also be studied. The model can also be adapted to almost all Knauf Insulation products by using parameters where necessary: for example, several products have different binder contents, so a parameter defines the amount of binder. As some materials can be recycled between several parts of the process, special attention has been paid to recycling loops inside the model. The model is flexible enough to be used for Environmental Product Declaration (EPD) as well as for Eco-Design purposes. [less ▲]

Detailed reference viewed: 14 (3 ULg)
Full Text
See detailModeling using the SWAT model of water flow and transport in suspension in the watershed of the valley of Wadi El-Hachem
Tadrist, Nassima ULg; DEBAUCHE, OLIVIER ULg; Degré, Aurore ULg et al

Poster (2014, May 12)

In the Maghreb, dams regularly suffer from excessive siltation due to erosion problems present in the catchment areas. The origins of this erosion are multiple: land use, deforestation, land affectation ... [more ▼]

In the Maghreb, dams regularly suffer from excessive siltation due to erosion problems present in the catchment areas. The origins of this erosion are multiple: land use, deforestation, land affectation , ... Hydrology coupled with geographic information systems allows using distributed and physically based models to predict the evolution of siltation of dams. The application of these models in Algeria will finally predict the impact of anti-erosion measures, land use patterns on the siltation of dams accurately estimating the amount of sediment produced by erosion runoff and the degree of filling. A methodology based on the map data (digital terrain model, map soil science, geology map and mapping of land use) and daily meteorological data (temperature, relative humidity, wind speed, solar radiation) is being development and testing of the dam Bourkourdane. The SWAT model is used to predict the amount of sediment accumulating in the dam, the water flow rate inbound, outbound, and the volumes of water and sediment stored in the dam. Adequate management of releases, coupled with better management of erosion upstream of the dam will extend the life of dams Algerians. Especially for Boukourdane, improved management of releases is paramount to improve groundwater recharge, fight against the intrusion of marine waters and prevent the accumulation of fine particles that reduce soil permeability. [less ▲]

Detailed reference viewed: 17 (4 ULg)
Full Text
See detailFully implicit integration scheme for the GTN model
Guzmán Inostroza, Carlos Felipe ULg; Habraken, Anne ULg

Poster (2014, May 12)

Fully integration scheme for the GTN model, applied to some shear extensions. The model also comprises Hill type anisotropy and mixed (Isotropic/kinematic) hardening. The consistent tangent matrix is also ... [more ▼]

Fully integration scheme for the GTN model, applied to some shear extensions. The model also comprises Hill type anisotropy and mixed (Isotropic/kinematic) hardening. The consistent tangent matrix is also calculated. [less ▲]

Detailed reference viewed: 29 (2 ULg)
Peer Reviewed
See detailA clinical lab experience with an automated HIV Antigen/Antibody (Ag/Ab) combined assay
HUYNEN, Pascale ULg; TOUSSAINT, Françoise ULg; GERARD, Christiane ULg et al

Poster (2014, May 11)

OBJECTIVES: To describe the diagnostic performance of a new fourth-generation HIV Ag/Ab chemiluminescent immunoassay, available on the new LIAISON® XL analyser, in a clinical setting. METHODS: Through ... [more ▼]

OBJECTIVES: To describe the diagnostic performance of a new fourth-generation HIV Ag/Ab chemiluminescent immunoassay, available on the new LIAISON® XL analyser, in a clinical setting. METHODS: Through February 2012-October 2013, 12,438 samples of serum, received at our laboratory for screening for HIV infection were routinely tested with LIAISON® XL Murex HIV Ab/Ag assay (HIV-XL), which employs HIV-1, HIV-1 group O, and HIV-2 antigens and anti-p24 monoclonal antibodies in two coupled reagent cartridges, providing information of the overall Ab/Ag reactivity and detail of the specific reactivity for anti-HIV/HIV p24 antigen. Each serum with positive result or with negative result displaying a value close to the cut-off were sent to the regional AIDS-Reference Laboratory (RefLab) to perform confirmatory assays (PCR, Immunoblot). A previous verification of the HIV-XL demonstrated 100% sensitivity with a challenge panel of hundred positive sera provided by the RefLab. Performed external quality control was from United-Kingdom National External Quality Assessment Service (NEQAS). RESULTS: Out of the clinical samples, 12,312 non-reactive samples (including 6 negative results displaying a value close to the cut-off further confirmed true HIV negative), 64 Ab HIV reactive samples (all confirmed HIV-1 positive by immunoblot), including 4 samples reactive also for Ag HIV (confirmed positive by Ag assay/PCR), 42 Ab HIV reactive samples tested negative by immunoblot, and 20 Ag HIV reactive samples tested negative by the kit used for the Ag p24 detection in our HIV Reference Lab, have been found. All the 43 NEQAS specimens tested, 16 reactive and 27 non-reactive, were correctly classified. These results, considered all together, provide a calculated positive predictive value of 57.5% with an estimated specificity of 99.5% (with 95% confidence interval of 99.36-99.62%), and a calculated negative predictive value of 100% with an estimated sensitivity of 100.0% (with 95% confidence interval of 95.49-100%). CONCLUSIONS: In our experience HIV-XL showed excellent performance associated to all the advantages of a fully automated/random access instrument. [less ▲]

Detailed reference viewed: 38 (15 ULg)
Peer Reviewed
See detailConcept et agencement de la lutte contre la "fraude sociale"
Kéfer, Fabienne ULg

in Vermeulen, Geert; Masset, Adrien; Flore, Daniel (Eds.) Comment s'en prendre à la fraude sociale, l'exploitation au travail et la traite des êtres humains : défis et solutions aux niveaux national et européen (2014, May 11)

Detailed reference viewed: 16 (1 ULg)
Full Text
Peer Reviewed
See detailProjet de recherche appliquée SpatioData : Spécification d’un système participatif pour la réutilisation de données sporadiques sur le bâtiment
Ben Rajeb, Samia ULg; Delfosse, Vincent ULg; Boulanger, Christelle ULg et al

in Proceedings du colloque 01'Design 9 (2014, May 09)

Cet article présente un projet de recherche nommé SpatioData qui a duré trois ans et dont l’objectif visait l’exploitation de nouvelles technologies de l’information et de la communication (TIC) pour ... [more ▼]

Cet article présente un projet de recherche nommé SpatioData qui a duré trois ans et dont l’objectif visait l’exploitation de nouvelles technologies de l’information et de la communication (TIC) pour proposer un outil innovant permettant la réutilisation d’informations liées au bâtiment. Nous montrerons, au travers d’enquêtes et d’interviews, l’importance de faciliter l’accès aux données rattachées à l’historique du bâtiment via un système innovant et intuitif qui permettra à tous les acteurs du secteur de la construction et de la gestion immobilière de trouver et de partager des informations utiles, c’est-à-dire des données spécialisées, contextualisées et spatialisées, en temps réel. Nous listerons des recommandations afin que ces données, qui auraient été perdues ou jetées, puissent être automatiquement mises en relation avec le lieu de l’intervention (géoréférencement) et le type d’intervenant (utilisateur) permettant ainsi de compléter une base de données spatialisées basée sur un modèle de bâtiment spécifique. [less ▲]

Detailed reference viewed: 23 (8 ULg)
Full Text
See detailInspired bio- nanobiomaterials for tissue engineering and drug delivery systems
Grandfils, Christian ULg

in Vth International Workshop on "NANOPARTICLES, COATINGS AND MICROCONTAINERS: TECHNOLOGY, PROPERTIES, APPLICATIONS" Conference Materials (2014, May 09)

Detailed reference viewed: 6 (0 ULg)
Peer Reviewed
See detailLettere e arte, filologia e storia. Il progetto EpistolART
Moreno, Paola ULg

Conference (2014, May 09)

Detailed reference viewed: 14 (3 ULg)
Peer Reviewed
See detail“ At the intersections between Care Labor Migration and Transnational Family Care Circulation: the case of Colombian and Ecuadorian Care-Workers in the Global City of Brussels.”
Vivas Romero, Maria ULg

Conference (2014, May 08)

In Belgium, female migrant Care workers are key elements for the demographic challenges the country faces. The ageing of the population and the insertion of native women in the labor market led to an ... [more ▼]

In Belgium, female migrant Care workers are key elements for the demographic challenges the country faces. The ageing of the population and the insertion of native women in the labor market led to an increasing demand for their liable/affordable care-work. A key aspect that might help us to understand their careers toward their incorporation in Belgium are the circulations of care among and within their transnational family networks; which fluctuate over the life course and are subject to political, economic, cultural and social contexts of both sending and receiving societies. This study focuses precisely on the labor migration of Ecuadorian/Colombian care-workers in the global city of Brussels. Their labor migration could be seen as the result of their specific type of labor Care Work, the transnational care circulations among their families and the individual gender role changes that allow them to mobilize such resources. Considering this context, this research aims to understand how these women are actively mobilizing Transnational/familial Care Circulations in their careers towards their Incorporation in Belgium. In order to do so I will make use of a Care Circulation approach, which allows me to: Firstly, understand the individual characteristics and the transnational changes in Gender roles that either facilitates or constraint this mobilization of care. Secondly, link the individual level to the opportunities and constraints posed by the state institutions and migration regimes in this mobilization of care. Lastly, it allows me to take a look at the networks of co-nationals who over time sustain their settlement in Belgium and their transnational care-giving practices. It is through the combination of these past three aspects that this research contributes to a better understanding of the feminization of care labor migration in Belgium; by analyzing transnational family care circulation and showing the intersections between kinship and economic and political motivations in migratory moves, highlighting the role of family and the domestic sphere in sustaining diaspora ties and certain types of labor migration such as care-work. More over, it seeks to highlight these women’s agency within their transnational families and migratory projects, recognizing the heterogeneity in strategies and profiles even within the so-called “care sector”. [less ▲]

Detailed reference viewed: 26 (5 ULg)
Full Text
See detailL'hypertension artérielle
Krzesinski, Jean-Marie ULg

Conference (2014, May 08)

Detailed reference viewed: 56 (0 ULg)
Full Text
Peer Reviewed
See detailNumerical Simulation of a Conical Shape Made by Single Point Incremental Forming
Velosa De Sena, José ULg; Duchene, Laurent ULg; Habraken, Anne ULg et al

in Incremental sheet forming (2014, May 08)

Detailed reference viewed: 15 (5 ULg)
Full Text
Peer Reviewed
See detailDes indices de la perception du temps à son implication dans le quotidien. L’évolution développementale de la perception de la durée.
SCHOLL, Jean-Marc ULg

Conference (2014, May 08)

Introduction La perception du temps a un retentissement majeur dans la vie quotidienne. Son déficit altère la capacité de l’enfant à intégrer le temps à la corporéité de son être et de ses activités ... [more ▼]

Introduction La perception du temps a un retentissement majeur dans la vie quotidienne. Son déficit altère la capacité de l’enfant à intégrer le temps à la corporéité de son être et de ses activités. Seule le temps séquentiel est généralement évalué. Il n’existe pas de repères sémiologiques de la durée du temps, ni d’outils pour l’évaluer. Son évolution développementale est inconnue. Nous nous proposons d’évaluer la perception de la durée par des marqueurs sémiologiques en milieu écologique dans une population générale d’enfants et une population d’enfants avec une psychopathologie. Méthode Un questionnaire parental a été créé pour observer la perception du temps et appliqué dans 2 populations d'enfants de 2,5 à 12 ans : 827 enfants en population générale et 297 enfants consultant des Services de Santé Mentale (population transnosographique). Une régression logistique multinominale donne des courbes de percentiles (P5, P50, P95). Résultats Dans la population générale, la perception de la durée est progressivement acquise avec une pleine compétence à 9 ans. Le temps séquentiel est acquis à 4 ans. Dans la population consultant en SSM, la moyenne de la perception de la durée est retardée de 18 mois et demeure faible à 13 ans. Il n’y a pas de différences selon le sexe. Discussion La perception de la durée est une importante caractéristique développementale non prise en compte jusqu’à présent. Des enfants consultants en santé mentale ont un déficit de cette perception. Les marqueurs sémiologiques du questionnaire parental mis au point relèvent ces difficultés dans la vie quotidienne de l’enfant. Mots-clés Perception du temps ; durée du temps ; temps séquentiel ; psychologie développementale ; questionnaire parental [less ▲]

Detailed reference viewed: 11 (3 ULg)
Peer Reviewed
See detailEvaluating the social costs and benefits of surveillance: the case of HPAI in Vietnam
Delabouglise, alexis; Antoine-Moussiaux, Nicolas ULg; Phan Dang, Thang et al

Conference (2014, May 08)

Economic evaluations of animal health surveillance systems are critical components of the assessment of their long-term sustainability and the improvement of their cost- effectiveness. Social costs and ... [more ▼]

Economic evaluations of animal health surveillance systems are critical components of the assessment of their long-term sustainability and the improvement of their cost- effectiveness. Social costs and benefits of health information release through the surveillance systems are fundamental determinants of the acceptability and efficacy of surveillance and are often neglected in the evaluation process. This study presents the evaluation of social costs and benefits of Highly Pathogenic Avian Influenza (HPAI) surveillance in Vietnam. Three field studies were conducted in the South and North of the country. Data on animal health information flow networks and social costs and benefits were collected using participatory approaches. Non-monetary costs and benefits were quantified using a newly developed tool based on stated choice method and participatory techniques. The study showed that private actors incur many transaction costs in reporting the information. However social costs mainly arise from price drops due to information release on market which has strong influences on the decision to disclose sanitary information. This applies at all levels including farmers and veterinary authorities. Private actors of the poultry sector valued information on occurring disease outbreaks, which is perceived as a social benefit. However avian influenza information is scarcely disclosed in private networks as stakeholders fear its potential impact on markets. [less ▲]

Detailed reference viewed: 20 (0 ULg)
Full Text
See detailTrend evolution of Carbonyl Sulfide above Jungfraujoch
Lejeune, Bernard ULg

Conference (2014, May 08)

Detailed reference viewed: 14 (3 ULg)
Full Text
Peer Reviewed
See detailModeling information sharing in animal health surveillance with social network analysis
Delabouglise, Alexis; Dao Thi, Hiep; Nguyen Tien, Thanh et al

Poster (2014, May 08)

Detailed reference viewed: 17 (4 ULg)
Full Text
See detailLa régionalisation de l'IPP. Quel impact pour les communes ?
Husson, Jean-François ULg

Conference (2014, May 08)

Cette contribution évoque les problèmes et questions soulevées par la régionalisation de l'impôt des personnes physiques dans le cadre de la 6e réforme de l'Etat. Les questions liées au "fiscal mix" sont ... [more ▼]

Cette contribution évoque les problèmes et questions soulevées par la régionalisation de l'impôt des personnes physiques dans le cadre de la 6e réforme de l'Etat. Les questions liées au "fiscal mix" sont notamment abordées. [less ▲]

Detailed reference viewed: 12 (0 ULg)
Full Text
Peer Reviewed
See detailLes traductions de récits de voyage et leurs arrière-plans politiques
Vandersmissen, Jan ULg

Conference (2014, May 08)

Ce papier s’inscrit dans un projet de recherche financé par le Fonds de la Recherche Scientifique – FNRS qui vise à mettre en rapport l’intérêt accru des savants pour l’Afrique à la fin du XVIIIe siècle ... [more ▼]

Ce papier s’inscrit dans un projet de recherche financé par le Fonds de la Recherche Scientifique – FNRS qui vise à mettre en rapport l’intérêt accru des savants pour l’Afrique à la fin du XVIIIe siècle et l’intensification de la compétition économique et militaire entre la France et la Grande-Bretagne. Ce projet ambitionne de démontrer comment une connaissance de plus en plus précise du terrain africain a influencé la façon dont les gouvernements des deux pays ont intégré l’expertise coloniale dans une politique scientifique complexe appropriée aux besoins spécifiques des deux états. L’originalité de cette étude consiste en l’approche comparative des « politiques scientifiques » coloniales successives de la France et de la Grande-Bretagne. Les récits de voyage ont joué évidemment un rôle important dans la collecte d’informations. Les expéditions ont été suivies de près par le public lettré, par les institutions scientifiques mais aussi par les décideurs politiques des deux côtés de la Manche. En plus de nouvelles données scientifiques, les récits contenaient également des informations d’importance économique et stratégique. Les fonctionnaires ont donc soumis les récits à l’analyse critique dès leur parution. On avait intérêt à faire traduire les récits composés par les concurrents. Ce papier mettra l’accent sur la traduction de récits de voyage français et britanniques, et sur leurs arrière-plans politiques. [less ▲]

Detailed reference viewed: 14 (0 ULg)
Peer Reviewed
See detailUse of participatory approaches for the evaluation of animal health surveillance systems in northern countries
Calba, Clémentine; Antoine-Moussiaux, Nicolas ULg; Peyre, Marisa et al

Conference (2014, May 08)

Accurate evaluations of surveillance systems are keys in the guidance for critical health decisions and policy issues. However, current guidelines and frameworks used for evaluation are often providing a ... [more ▼]

Accurate evaluations of surveillance systems are keys in the guidance for critical health decisions and policy issues. However, current guidelines and frameworks used for evaluation are often providing a list of attributes (indicators) with no or few details about the methods used to measure these attributes. By reviewing the advantages and limits of existing methods and tools we highlighted the needs for innovative tools to assess specific attributes or to address specific evaluation questions. Indeed socio-economic and cultural context of surveillance are hardly ever considered within the evaluation process. Therefore we have identified a list of attributes that could be assessed completely or partially with the use of participatory approaches in order to improve the completeness of surveillance systems’ evaluation process. Moreover, these approaches should lead to improved recommendations and to a better acceptability by the stakeholders. [less ▲]

Detailed reference viewed: 18 (1 ULg)
Full Text
See detailCOMPARISON AND MOLECULAR CHARACTERIZATION OF ANIMAL AND HUMAN CLOSTRIDIUM DIFFICILE STRAINS
Rodriguez Diaz, Cristina ULg; Taminiau, Bernard ULg; Korsak Koulagenko, Nicolas ULg et al

Poster (2014, May 07)

The main objective of this study was to characterize and compare animal and human C. difficile strains with respect to the PCR-ribotype and the antibiotic resistance. Multilocus sequence typing analysis ... [more ▼]

The main objective of this study was to characterize and compare animal and human C. difficile strains with respect to the PCR-ribotype and the antibiotic resistance. Multilocus sequence typing analysis (MLST) was performed in order to study clonal relationships of the isolates. [less ▲]

Detailed reference viewed: 24 (3 ULg)
Full Text
Peer Reviewed
See detailStudy of the microbial flora of steak tartare by metagenomic approach
Korsak Koulagenko, Nicolas ULg; Delhalle, Laurent ULg; Nezer, Carine et al

Poster (2014, May 06)

Detailed reference viewed: 27 (3 ULg)
Peer Reviewed
See detailÉcrire les «petites langues»: entre transparence et universalisme
Baiwir, Esther ULg

Conference (2014, May 06)

Detailed reference viewed: 6 (1 ULg)
Full Text
Peer Reviewed
See detailHas oxygen depletion an impact on nutrients and macrofauna in a highly dynamic macrophytodetritus accumulation?
Remy, François ULg; Mascart, Thibaud ULg; Dauby, Patrick ULg et al

Poster (2014, May 06)

Posidonia oceanica is an endemic Mediterranean highly productive seagrass. Depending on the ability of the primary consumers to digest it alive, a generally important part of its foliar primary production ... [more ▼]

Posidonia oceanica is an endemic Mediterranean highly productive seagrass. Depending on the ability of the primary consumers to digest it alive, a generally important part of its foliar primary production falls in autumn, to decay inside the meadow or to be exported to sand patches to form “exported litter accumulations”. These accumulations are highly dynamic depending on hydrodynamics and seafloor geomorphology. Literature says that low O2 conditions might occur inside litter accumulations, but the annual oxygen dynamics or its impact on the litter-associated macrofauna has never been measured. We focused on 2 exported litter accumulations in Calvi Bay (Corsica), during 2 years for a total of 8 seasons. For each season, we collected water samples (n=6) from 3 different strata: Water Column (WC), Water Just Above the litter (WJA) and Water Inside the litter (WI). Oxygen was measured for each replicate using a Winkler-based automated routine for oxygen concentration measurements on micro-volumes. At the same time, nutrients concentrations (PO4, NH4, and NO2+NO3) were measured in WC, WJA and WI, but also in the Interstitial Water (IW) using a spectrophotometric continuous flow analyzer (adapted for low nutrients level in an oligotrophic environment). In parallel, macrofaunal (size >500µm) samples (n=3-6) were also collected, counted and identified to the specific level. Our results show significant differences between O2 concentrations/saturation from WI and the two other strata. Significant differences were detected between seasons, sites and years for WI which is the only stratum where really low O2 conditions can be observed. Significant differences were also detected between seasons for both WC and WJA but no differences between sites and years. On the other hand no significant differences were detected between WC and WJA. A similar observation was made for the nutrients at the annual, seasonal and spatial level. Moreover differences are also observed between the nutrients themselves. Our data shows no correlation between WI O2 concentrations and saturation, and global macrofauna abundance or biodiversity. Results are more contrasting at an individual specific level for the 4 most dominant species. For two amphipod species, Gammarella fucicola (55% of the global abundance) and Gammarus aequicauda, no significant correlations were detected between their abundance and O2. For the leptostracan species, Nebalia strausi, a significant negative correlation with O2 concentration was detected. For the last amphipod species, Melita hergensis, a significant positive correlation was observed. Our analyses also show significant correlations between WI O2 concentration/saturation, and WI / IW nutrients concentration. To conclude, this work shows that WI is a very particular and dynamic environment considering O2 concentration and saturation. Low O2 conditions can be observed in WI but never in WC or WJA showing that internal processes and relations with the sediment determine the O2 dynamics in WI and showing a potential “barrier” effect between WI and WC. Moreover O2 dynamics and its consequences may play a role in the nutrients dynamics and cycles. It is clear that faunal responses to low O2 conditions are not identifiable at a global community level. At a specific level, we show a more complex situation: some species do not seem to be impacted by low O2 conditions, but some present a significant positive, or a significant negative response. This shows the existence and complexity of species-dependent low O2 tolerance/adaptation, and the importance of a specific level data analyses to detect responses of dominant litter associated macro- invertebrates to O2 concentration and saturation variations. [less ▲]

Detailed reference viewed: 20 (5 ULg)
Full Text
See detailNo performance reduction at the present northern edge of Ambrosia artemisiifolia L. invasion range
Ortmans, William ULg

Conference (2014, May 05)

Plant populations at range edges may exhibit reduction of performances and fitness. In the case of biological invasions, such a reduction could be associated with a slowing down of the spread and explain ... [more ▼]

Plant populations at range edges may exhibit reduction of performances and fitness. In the case of biological invasions, such a reduction could be associated with a slowing down of the spread and explain the non-naturalization of a species outside its present invasion range. Common ragweed (Ambrosia artemisiifolia L.) is an ideal model to investigate such processes, since it is invasive in France but not naturalized in northern countries, such as Belgium and the Netherlands. In this study, we test if the performances of ragweed populations vary among different invasion zones. Three populations were selected in each of four invasion zones in Western Europe: 1) French invasion area; 2) northern and 3) southern invasion edges; and 4) outside the invasion area (Belgium and Netherlands). Field performances (growth, reproduction, stress resistance) were recorded on 25 plants per population. Furthermore, the competition by the native flora was assessed around each plant. Generalized Linear Models were used to compare performance among invasion zones and populations, with competition as covariate. Regressions were also performed to assess the influence of climatic data on population performances. No evidence of decreasing performances was found at the edges of the invasion area, neither outside of it, suggesting that the invasion front has the potential to keep going northwards. Competition by native flora had a significant impact on stress resistance, but did not decrease reproduction or growth. These results are discussed in the light of other ongoing experiments in Belgium. [less ▲]

Detailed reference viewed: 12 (3 ULg)
Full Text
See detailAnaerobic methane oxidation in two tropical freshwater systems
Roland, Fleur ULg; Darchambeau, François ULg; Crowe, SA et al

Poster (2014, May 05)

Detailed reference viewed: 10 (1 ULg)
Full Text
See detailCorrelation between the acoustic noise field measured in a Posidonia oceanica bed and the photosynthetic activity
Felisberto, P; Zabel, F; Rodriguez, O et al

Poster (2014, May 05)

Detailed reference viewed: 12 (2 ULg)
Full Text
See detailHypoxia in macrophytodetritus accumulation: Species specific harpacticoid copepod adaptation?
Mascart, Thibaud ULg; De Troch, Marleen; Gobert, Sylvie ULg et al

Poster (2014, May 05)

Mediterranean Posidonia oceanica seagrass meadows generate high primary production and support large biodiversity of associated fauna and flora. The majority of the foliar material falls on the ... [more ▼]

Mediterranean Posidonia oceanica seagrass meadows generate high primary production and support large biodiversity of associated fauna and flora. The majority of the foliar material falls on the unvegetated sea floor during the autumnal leaf senescence, fuelling the detrital food web. Whilst laying on the sea floor the freshly formed macrophytodetritus pile up into accumulations according to the local hydrodynamics and seafloor geomorphology. In these litter accumulations, harpacticoid copepods (Crustacea, Copepoda) are the main meiofaunal players (metazoans in the size range of 38µm – 1mm) and show a high specific diversity. They are primarily grazers, but their high specific diversity suggests that they occupy also a large variety of trophic niches. This large morphological and trophic diversity can partly be promoted by the complexity of the phytodetritus in seagrass accumulations. On the other hand, macrophytodetritus degradation and flux of reduced compounds from the sediments is responsible for oxygen consumption inside the accumulation of seagrass litter. Therefore, concentration of oxygen inside the accumulation is very variable and often under the concentration observed in the water column just above the litter. Frequently, oxygen levels reach very low values. The present study aims to link the oxygen variability inside the accumulation to the densities of the five most dominant harpacticoid copepods found living in the P. oceanica litter. Standardized samples were collected seasonally in two contrasting sites of the Calvi Bay (Corsica) during one year. Our results showed no correlation between the oxygen concentrations and harpacticoid community diversity or their total abundances. The five most dominant species showed divergent results, but none had a clear correlation with the oxygen concentration. This contrasts with observation done for sediment meiofaunal community where most harpacticoid copepods are sensitive to oxygen level and where nematodes often dominate the community. This could be explained by their high mobility and the patchiness and variability of the oxygen concentrations present in the accumulations. Harpacticoid copepods, whilst being sensitive to hypoxia and anoxia developed a strategy to live in this fast oxygen changing environment. To conclude, our results underline the importance of species-specific analysis of correlation data. Especially in complex and dynamic environments where a variety of potential trophic niches are present and species competition is very likely to occur. The overall abundance pattern and diversity of the copepod community showed no relation to the oxygen concentration while the most abundant copepod species did not responded to fluctuating oxygen concentrations. [less ▲]

Detailed reference viewed: 19 (0 ULg)
Full Text
See detailRates of microbial sulfur oxidation in low oxygen environments
Crowe, SA; Canfield, DE; Sturm, A et al

Poster (2014, May 05)

Detailed reference viewed: 49 (0 ULg)
Full Text
See detailAmmonia Oxidising Archaea in the OMZ of a freshwater African Lake
Lliros, M; Ingeoglu, O; Garcia-Armisen, T et al

Poster (2014, May 05)

Detailed reference viewed: 22 (0 ULg)
Full Text
Peer Reviewed
See detailHeroin-assisted treatment showed better efficacy than methadone
ANSSEAU, Marc ULg; Demaret, Isabelle ULg

Poster (2014, May 04)

Background: A fraction of patients receiving methadone treatment pursues their use of street heroin. In Switzerland, a new treatment with prescribed diacetylmorphine (pharmaceutical heroin) was developed ... [more ▼]

Background: A fraction of patients receiving methadone treatment pursues their use of street heroin. In Switzerland, a new treatment with prescribed diacetylmorphine (pharmaceutical heroin) was developed to help these heroin addicts resistant to methadone treatment to decrease their street heroin use. In this heroin-assisted treatment (HAT), diacetylmorphine is prescribed to severe heroin user and diacetylmorphine is administered by patients under the supervision of nurses in a specific centre. Six randomised controlled trials compared HAT to methadone treatment: in Switzerland, The Netherlands, Spain, Germany, Canada and United- Kingdom. HAT showed better efficacy than methadone. Patients used less street heroin, their health improved and their criminal behaviour decreased. A new trial assessed in Belgium the feasibility and efficacy of this treatment compared to methadone treatment. Methods: The TADAM (Treatment Assisted by Diacetylmorphine) was an open label randomised controlled trial developed on the Swiss model of HAT developed in 1994. Main inclusion criteria were 5 years of heroin addiction, (almost) daily use of street heroin and a previous attempt of methadone treatment. As in the Dutch experiment, patients could choose to inhale or to inject diacetylmorphine in the new HAT centre. HAT was stopped after 12 months and the best available treatment was offered to the patient. The research team assessed subjects every three months with standardised questionnaires (EuropASI, MAP-HSS, SCL-90-R) and questions on involvement in a criminal milieu. We completed our reported data with toxicological analysis and criminal proceedings. Results: 74 subjects were randomised in the trial: 36 in the experimental group and 38 in the control group. According to the primary efficacy criterion, the experimental group counted at least 30% more responders than the control group after 3 months (p<0.05), 6 months (p<0.05) and 9 months (p<0.01). At the 12 month assessment, the number of responders was still higher in the experimental group but the difference (11%) was no more significant (p=0.35). At the 12 month assessment, the condition of patients in the experimental group worsened compared to the 9 month assessment. This effect was not seen in the control group were patients could continue their methadone treatment after the 12 months. Conclusion: As in other countries, HAT is an effective treatment for severe heroin addicts resistant to methadone treatment. However, a predetermined duration of 12 month counteracts the efficacy of this treatment. [less ▲]

Detailed reference viewed: 17 (1 ULg)
Full Text
Peer Reviewed
See detailTropospheric jet stream as a source of traveling ionospheric disturbances observed by GPS
Wautelet, Gilles ULg; Warnant, René ULg

Poster (2014, May 02)

The integrity and the reliability of real-time precise positioning applications with Global Positioning System (GPS) are affected by the ionospheric variability with time and space. As a consequence ... [more ▼]

The integrity and the reliability of real-time precise positioning applications with Global Positioning System (GPS) are affected by the ionospheric variability with time and space. As a consequence, scientific community aims at describing, explaining and forecasting the occurrence and the amplitude of ionospheric irregularities observed by GPS. The use of the geometric-free combination of GPS dual frequency signals allows to retrieve the Total Electron Content (TEC) along the satellite-to-receiver path, which is the basic trans-ionospheric observable. Based on L1/L2 GPS phase measurements collected at a given station, the TEC high-frequency variability is isolated. A climatological study performed over 10 years in Western Europe shows that TEC irregularities are mostly observed daytime during quiet geomagnetic background in autumn and winter and correspond to classical Medium-Scale Traveling Ionospheric Disturbances (MSTIDs). The latter are generally understood as the ionospheric signature of Atmospheric Gravity Waves (AGWs), either generated in situ (solar terminator) or in the lower atmosphere and propagating upward. Because of its associated strong wind shears, the tropospheric jetstream, occurring mainly during autumn and winter months, constitutes an ideal candidate for AGW generation. This paper analyzes the spatial correlation between the presence of both MSTIDs and strong jetstream over Western Europe. This correlation is positive when the ionospheric pierce point of the satellite is located above regions of interest where wind shears are very large. In practice, we have selected regions for which wind speed is larger than 50 m/s. In addition, the propagation of AGWs up to the ionospheric layer is taken into account by assuming horizontal and vertical velocities of 200 and 50 m/s respectively. It comes that the region of interest of the correlation study is computed using an isotropic slant propagation of the AGW, which is supposed to be generated at a tropospheric level.Based on 30s GPS data collected over several stations in Belgium and on European Centre for Medium-Range Weather Forecasts (ECMWF) wind velocity maps, the correlation study covers a period ranging from January 2002 to December 2011. Preliminary results based on a limited number of cases show that large amplitude MSTIDs are generally observed during periods of strong wind speeds at an altitude corresponding to a pressure level of 250hPa (about 10 km). [less ▲]

Detailed reference viewed: 14 (1 ULg)
See detailLes insectes, des aliments?
Blecker, Christophe ULg

Conference (2014, May 02)

Detailed reference viewed: 7 (0 ULg)
Full Text
See detailEOF analysis of long-term reconstructed AVHRR Pathfinder SST in the South China Sea
Huynh, Thi Hong Ngu ULg; Alvera Azcarate, Aïda ULg; Barth, Alexander ULg et al

Poster (2014, May 02)

Sea surface temperature (SST) is one of the key variables often used to investigate ocean dynamics, ocean-atmosphere interaction, and climate change. For recent decades, the AVHRR Pathfinder SST, measured ... [more ▼]

Sea surface temperature (SST) is one of the key variables often used to investigate ocean dynamics, ocean-atmosphere interaction, and climate change. For recent decades, the AVHRR Pathfinder SST, measured by infrared sensors, has been widely used because of its high resolution and long time-series. The disadvantage of the AVHRR Pathfinder SST is high percentage of missing data due to cloud coverage. This becomes more serious in the South China Sea (SCS) because it is located in the tropical region, frequently covered by clouds. In this study, we used the Data INterpolating Empirical Orthogonal Functions (DINEOF) method to reconstruct daily night-time 4 km AVHRR Pathfinder SST spanning from 1989 to 2009 for the whole SCS. In order to better understand the spatial and temporal variability of the SCS SST, an EOF analysis of the reconstructed field is performed in association with surface wind. The first SST mode, accounting for 69% of the variance, presents the cooling (warming) of the basin due to the solar inclination through seasons, water exchange, topography, and monsoon-induced cyclonic circulation. The second SST mode, explaining 24.8% of the variance, shows the advection of cold and warm water from two opposite directions along the southwest-northeast diagonal of the basin. The second SST mode is affected by the atmospheric anticyclone (cyclone) located over the Philippine Sea. Comparing both SST modes with Nino3.0 index, it shows that the interannual variability of the SCS SST is influenced by the moderate and strong ENSO events with a lag of 5-6 months. Moreover, the analysis of the high-resolution reconstructed dataset reveals some oceanic features that could not be captured in previous EOF analyses. [less ▲]

Detailed reference viewed: 50 (4 ULg)
See detailInternet facilite-t-il un apprentissage de plus en plus auto-déterminé ? Illustrations et réflexions.
Poumay, Marianne ULg

Conference (2014, May 01)

Après avoir introduit le thème du contrôle par l’étudiant de son propre apprentissage, la conférence illustrera des situations d’apprentissage et d’évaluation (bien sûr faisant usage d’Internet) qui ... [more ▼]

Après avoir introduit le thème du contrôle par l’étudiant de son propre apprentissage, la conférence illustrera des situations d’apprentissage et d’évaluation (bien sûr faisant usage d’Internet) qui poussent l’étudiant à faire des choix et qui, en corollaire, aboutissent à faire valider par les enseignants le résultat de trajectoires riches et différenciées. Rassembler des preuves de son développement de compétences, planifier son inscription dans une série de MOOCs ou son travail en ligne suite à un test diagnostique sont autant d’actions qui responsabilisent l’étudiant quant à sa propre formation. Mais l’apprentissage autodéterminé est-il à la portée de tous les étudiants ? [less ▲]

Detailed reference viewed: 18 (1 ULg)
Full Text
See detailBias correction using data assimilation: Application on the Lorenz ’95 and NEMO-LIM models.
Canter, Martin ULg; Barth, Alexander ULg

Poster (2014, May 01)

Data assimilation has been used for decades in fields like engineering or signal processing to improve forecast models. Ensemble Kalman filters and other sequential data assimilation methods are examples ... [more ▼]

Data assimilation has been used for decades in fields like engineering or signal processing to improve forecast models. Ensemble Kalman filters and other sequential data assimilation methods are examples of developments which reduce the uncertainty of the model by taking observations into account. The widespread interest in addressing systematic forecast model errors only arose when the advances in modelling, data assimilation and computational power had reduced random errors to the point of commensurability with systematic errors, also known as bias. We present here a new method of bias correction using data assimilation. This method is based on the stochastic forcing of a model to correct bias. First, through a preliminary run, we estimate the bias of the model and its possible sources. Then, we establish a forcing term which is directly added inside the model’s equations. We create an ensemble of runs and consider the forcing term as a control variable during the assimilation of observations. We then use this analysed forcing term to correct the bias of the model. Since the forcing is added inside the model, it acts as a source term, unlike external forcings such as wind. This procedure has been developed and successfully tested with a twin experiment on a Lorenz 95 model. Indeed, we were able to estimate and recover an artificial bias that had been added into the model. This bias had a spatial structure and was constant through time. The mean and behaviour of the corrected model corresponded to those the reference model. It is currently being applied and tested on the sea ice ocean NEMO LIM model, which is used in the PredAntar project. NEMO LIM is a global and low resolution (2 degrees) coupled model (hydrodynamic model and sea ice model) with long time steps allowing simulations over several decades. Due to its low resolution, the model is subject to bias in area where strong currents are present. We aim at correcting this bias by using perturbed current fields from higher resolution models and randomly generated perturbations. [less ▲]

Detailed reference viewed: 4 (0 ULg)
Full Text
See detailApproche systémique de l’intégration des TIC dans l’éducation : enjeux, actions et perspectives à l’horizon 2020
Denis, Brigitte ULg

Conference (2014, May 01)

En Belgique francophone, diverses initiatives ont vu le jour durant ces quinze dernières années dans le but de développer un usage réfléchi des TIC en éducation. Parmi celles-ci épinglons les « Plans TIC ... [more ▼]

En Belgique francophone, diverses initiatives ont vu le jour durant ces quinze dernières années dans le but de développer un usage réfléchi des TIC en éducation. Parmi celles-ci épinglons les « Plans TIC", la mise au point d’un curriculum de formation relatif aux usages et aux apports des médias et des TIC en enseignement destiné aux futurs enseignants, la mise en réseau d’enseignants du supérieur, la constitution de communautés d’apprenants supportées par les TIC. Plans d’équipement des écoles, projets-pilotes, formation initiale et continuée des enseignants en matière de TICE, réseaux de partage… convergent vers un même objectif : développer, expérimenter et diffuser des activités d’apprentissage à hautes plus-values. Des scénarios pédagogiques exploitant différents types d’outils/services technologiques et supports (ordinateurs, tablettes, tableaux interactifs…) et leurs plus-values sont mis au point afin de développer les savoirs, savoir-faire et savoir-être des apprenants, non seulement en rapport aux apprentissages scolaires, mais aussi dans l’optique d’un transfert dans la vie quotidienne, citoyenne et professionnelle. Certaines de ces initiatives seront présentées en les situant dans une approche systémique. Nous mettrons l’accent sur ce qui les unit, les facteurs facilitateurs et les obstacles rencontrés lors de leur implémentation sur le terrain et proposerons quelques recommandations. [less ▲]

Detailed reference viewed: 47 (6 ULg)
Full Text
See detailPlateforme interactive utilisée comme outil diagnostique et de remédiation adapté aux grandes populations étudiantes suivant un cours de physique
Marique, Pierre-Xavier ULg; Hoebeke, Maryse ULg

Conference (2014, May 01)

La réforme des études de médecine introduite en 2012 en Communauté Française (Belgique) a fortement modifié les programmes de cours, entre autres celui de physique, pour lequel certaines notions sont ... [more ▼]

La réforme des études de médecine introduite en 2012 en Communauté Française (Belgique) a fortement modifié les programmes de cours, entre autres celui de physique, pour lequel certaines notions sont désormais considérées comme prérequises. Conscientes que celles-ci ne sont pas toujours acquises par les étudiants, les équipes pédagogiques de l'ULg ont élaboré des systèmes de remédiation. Un espace en ligne a notamment été développé, parallèlement au cours présentiel (cours ex-cathedra, répétitions et laboratoires), afin de permettre aux enseignants et aux étudiants d'évaluer les difficultés et lacunes de ces derniers et d’y remédier. Cet outil est conçu pour offrir une aide spécifique adaptée à chacun malgré le nombre important d’étudiants inscrits (800 en 2013). Ils peuvent y travailler, de manière progressive et autonome, les aspects théoriques (notes et tests formatifs) et pratiques (exercices, problèmes décomposés ou non). Des tests diagnostiques en début et fin de parcours permettent aux apprenants d’apprécier leur évolution. De plus, la plate-forme centralise différents outils interactifs (forums, calendrier, annonces, …) accompagnant l’étudiant dans l’organisation de son apprentissage. Les premières analyses de traces indiquent une corrélation entre travail en ligne et réussite. Une adaptation progressive de l’outil sera basée sur l’analyse des résultats et du ressenti de étudiants. [less ▲]

Detailed reference viewed: 13 (2 ULg)
Full Text
See detailEffect of metal nanoparticles encapsulated in porous silica on the biphenyl biodegradation by Rhodococcus erythropolis T902.1
Wannoussa, Wissal ULg; Hiligsmann, Serge ULg; Heinrichs, Benoît ULg et al

Poster (2014, May 01)

Biphenyl is stable and highly hydrophobic, thus having a low availability for degrading microorganisms, which need an aqueous environment for their growth. As a consequence, bioremediation processes are ... [more ▼]

Biphenyl is stable and highly hydrophobic, thus having a low availability for degrading microorganisms, which need an aqueous environment for their growth. As a consequence, bioremediation processes are very limited. However, a few studies showed that using a low metal concentration accelerates the biodegradation of pollutants (Yeom and Yoo1997). Nanoparticles are considered as a new generation of compounds to improve environmental remediation and biological processes (Beckers et al. 2013; Zhang 2003). This paper investigated the enhancement effect of nanometre-sized metallic Cu, Ag, Pd or Co, on the biphenyl biodegradation by Rhodococcus erythropolis T902.1. Have been synthesized by a sol–gel process (Lambert et al. 2004). These nanoparticles (NP) of about 2–3 nm were encapsulated in porous silica (SiO2) and were added at low concentration (10-4M) in the M284 minimal medium with 500 ppm biphenyl as source of carbon and energy. The cultures containing Pd or Co produced 30% more biphenyl degraded with a higher Rhodococcus growth than those without NP (positive control) or with silica particles only. On the contrary, the presence of 10-4 M Cu or Ag nanoparticles showed an inhibitory effect on bacterial growth and biphenyl degradation compared to the positive. [less ▲]

Detailed reference viewed: 23 (10 ULg)
Full Text
See detailPromotion of physical activity in schools
Cloes, Marc ULg

Conference (2014, May 01)

This presentation will answer to the following questions: (1) Does the school play a role in PA promotion? (2) What are the dimensions of PA at school? (3) How to determine the potential role of the ... [more ▼]

This presentation will answer to the following questions: (1) Does the school play a role in PA promotion? (2) What are the dimensions of PA at school? (3) How to determine the potential role of the school in PA promotion? (4) What kind of projects to implement? (5) What do we have to remember? It will be based on an overview of the literature and will provide practical implications for researchers and practitioners. [less ▲]

Detailed reference viewed: 22 (0 ULg)
Full Text
See detailDetermination of the magnetic penetration depth in a superconducting Pb film
Brisbois, Jérémy ULg

Conference (2014, May 01)

By means of scanning Hall probe microscopy technique we accurately map the magnetic field pattern produced by Meissner screening currents in a thin superconducting Pb stripe. The obtained field profile ... [more ▼]

By means of scanning Hall probe microscopy technique we accurately map the magnetic field pattern produced by Meissner screening currents in a thin superconducting Pb stripe. The obtained field profile allows us to quantitatively estimate the Pearl length Λ without the need of pre-calibrating the Hall sensor. This fact contrasts with the information acquired through the spatial field dependence of an individual flux quantum where the scanning height and the magnetic penetration depth combine in a single inseparable parameter. The derived London penetration depth λL coincides with the values previously reported for bulk Pb once the kinetic suppression of the order parameter is properly taken into account. [less ▲]

Detailed reference viewed: 11 (3 ULg)
Full Text
Peer Reviewed
See detailCorrelation between composition and cold stability of palm liquid fractions.
Danthine, Sabine ULg; Lefebure, Emilie ULg; Dijkmans, Peggy et al

Poster (2014, May)

Detailed reference viewed: 8 (2 ULg)
Full Text
Peer Reviewed
See detailGestion active d’un réseau de distribution d’électricité : formulation du problème et benchmark
Gemine, Quentin ULg; Ernst, Damien ULg; Cornélusse, Bertrand ULg

in Proceedings des 9èmes Journées Francophones de Planification, Décision et Apprentissage (2014, May)

Afin d’opérer un réseau de distribution d’électricité de manière fiable et efficace, c’est-à-dire de respecter les contraintes physiques tout en évitant des coûts de renforcement prohibitifs, il devient ... [more ▼]

Afin d’opérer un réseau de distribution d’électricité de manière fiable et efficace, c’est-à-dire de respecter les contraintes physiques tout en évitant des coûts de renforcement prohibitifs, il devient nécessaire de recourir à des stratégies de gestion active du réseau. Ces stratégies, rendues nécessaires notamment par l’essor de la production distribuée, reposent sur des politiques de contrôle à court-terme du niveau de puissance des dispositifs producteurs ou consommateurs d’électricité. Alors qu’une solution simple consisterait à moduler à la baisse la production des générateurs, il paraît néan- moins plus intéressant de déplacer la consommation aux moments adéquats afin d’exploiter au mieux les sources d’énergie renouvelables sur lesquelles reposent généralement ces générateurs. Un tel moyen de contrôle introduit néanmoins un couplage temporel au problème, menant à un problème d’optimisation non-linéaire, séquentiel sous incertitude et à variables mixtes. Afin de favoriser la recherche dans ce domaine très complexe, nous proposons une formalisation générique du problème de ges- tion active d’un réseau de distribution moyenne tension (MT). Plus spécifiquement, cette formalisa- tion se présente sous la forme d’un processus de décision markovien. Dans cette article, nous pré- sentons également une spécification de ce modèle décisionnel à un réseau de 75 noeuds et pour un ensemble de services de modulation donnés. L’instance de test qui en résulte est disponible à l’adresse http://www.montefiore.ulg.ac.be/~anm/ et a pour objectif de mesurer et de comparer les performances des techniques de résolution qui seront développées. [less ▲]

Detailed reference viewed: 104 (38 ULg)
Full Text
Peer Reviewed
See detailToggling a genetic switch using reinforcement learning
Sootla, Aivar; Strelkowa, Natalja; Ernst, Damien ULg et al

in Proceedings of the 9th French Meeting on Planning, Decision Making and Learning (2014, May)

In this paper, we consider the problem of optimal exogenous control of gene regulatory networks. Our approach consists in adapting an established reinforcement learning algorithm called the fitted Q ... [more ▼]

In this paper, we consider the problem of optimal exogenous control of gene regulatory networks. Our approach consists in adapting an established reinforcement learning algorithm called the fitted Q iteration. This algorithm infers the control law directly from the measurements of the system’s response to external control inputs without the use of a mathematical model of the system. The measurement data set can either be collected from wet-lab experiments or artificially created by computer simulations of dynamical models of the system. The algorithm is applicable to a wide range of biological systems due to its ability to deal with nonlinear and stochastic system dynamics. To illustrate the application of the algorithm to a gene regulatory network, the regulation of the toggle switch system is considered. The control objective of this problem is to drive the concentrations of two specific proteins to a target region in the state space. [less ▲]

Detailed reference viewed: 18 (1 ULg)
Peer Reviewed
See detailEVALUATION OF THE RAPID DETECTION OF ST-17 AND ST-1 GROUP B STREPTOCOCCI USING A MICROFLEX MALDI-TOF MS (BRUKER)
MEEX, Cécile ULg; SACHELI, Rosalie ULg; DESCY, Julie ULg et al

Poster (2014, May)

Objectives Clearly associated to neonatal meningitis, Group B streptococci (GBS) classified as sequence type-17 (ST-17) are defined as the “highly virulent” clone amongst GBS. The aim of this study was to ... [more ▼]

Objectives Clearly associated to neonatal meningitis, Group B streptococci (GBS) classified as sequence type-17 (ST-17) are defined as the “highly virulent” clone amongst GBS. The aim of this study was to evaluate an easy and rapid method, recently described to detect ST-17 and ST-1 GBS, based on distinguishing peak-shifts present on the protein spectrum of these 2 sequence types, using a Microflex (Bruker) matrix-assisted laser desorption/ionization time of flight mass spectrometer (MALDI-TOF MS). Methods This study was performed on 67 multi locus sequence typed (MLST) GBS originated from the Belgian and Czech National Reference Centers, including 18 ST-17 and 16 ST-1. After culture on blood agar, an ethanol/formic acid extraction was performed on each strain. Each extract was spotted once on a target plate, overlaid with 1 µl alpha-cyano-4-hydroxycinnamic acid matrix and further analysed by a Microflex MALDI-TOF MS. One spectrum per isolate was recorded, 240 laser shots being recorded for each spectrum. The spectra were further analysed using a Bruker prototype software, and 2 logarithmic values, one for ST-17 and one for ST-1, calculated from the intensities of the present and absent peaks, were obtained for each strain. If >0, this value indicated the presence of the specific sequence type. In a second step, the test was repeated on each strain with discordant result when compared with MLST. Results Compared with MLST method, the first analysis of the strains gave poor results, leading to very low sensitivities (77.8% for ST-17 and 50% for ST-1) but rather good specificities (85.7% for ST-17 and 98.0% for ST-1). After repeating the analysis on the strains with discordant result, sensitivity, 100% and 93.8%, and specificity, 87.8% and 98.0%, for ST-17 and ST-1 respectively were highly improved. Conclusion Since ST-17 and ST-1 GBS both show distinguishing peak-shifts on their protein spectrum, as described by Lartigue et al., the distinction of these 2 sequence types is now possible by MALDI-TOF MS. To our knowledge, this study is the first describing this application on a Microflex MS using a software to classify the strains. The observed results are promising but, given to the variability of the logarithmic value given by the software, the need to perform several measures on a same strain seems to be essential. After optimization of the analysis procedure, this rapid, easy and cheap method could be used to precociously detect ST-17 among GBS isolated from prenatal screenings, allowing a better follow up of the colonized mothers and a closer monitoring of their newborns. We would like to thank the Bruker Company which allowed us to evaluate the prototype software they have developed. [less ▲]

Detailed reference viewed: 24 (7 ULg)
Full Text
See detailLong-term evolution and seasonal modulation above Jungfraujoch (46.5°N, 8.0°E): Optimisation of the retrieval strategy, comparison with model and independant observations
Bader, Whitney ULg; Stavrakou, J; Muller, J-F et al

Poster (2014, May)

Methanol (CH3OH) is the second most abundant organic compound in the Earth’s atmosphere after methane. In this work, we present the first long-term time series of methanol total, lower tropospheric and ... [more ▼]

Methanol (CH3OH) is the second most abundant organic compound in the Earth’s atmosphere after methane. In this work, we present the first long-term time series of methanol total, lower tropospheric and upper tropospheric-lower stratospheric partial columns derived from the analysis of high resolution Fourier transform infrared solar spectra recorded at the Jungfraujoch station (46.5°N, 3580 m a.s.l.). The retrieval of methanol is very challenging due to strong absorptions of ozone in the region of the selected 8 band of CH3OH. Two wide spectral intervals have been defined and adjusted in order to maximize the information content. Methanol does not exhibit a significant trend over the 1995-2012 time period, but a strong seasonal modulation characterized by maximum values and variability in June-July, minimum columns in winter and a peak-to-peak amplitude of 130 %. In situ measurements performed at the Jungfraujoch and ACE-FTS occultations give similar results for the methanol seasonal variation. The total and lower tropospheric columns are also compared with IMAGESv2 model simulations. There is no systematic bias between the observations and IMAGESv2 but the model underestimates the peak-to-peak amplitude of the seasonal modulations. [less ▲]

Detailed reference viewed: 7 (2 ULg)
Full Text
Peer Reviewed
See detailAlkaline hydrolysis for animal carcass disposal: a regulatory challenge
Van der Meulen, Karen; Custer, René; Houthoofd, Koen et al

Conference (2014, May)

Detailed reference viewed: 8 (1 ULg)
Full Text
See detailSustainable Resource Availability : Ge, Ni, Al three contrasting stories
Pirard, Eric ULg

Conference (2014, May)

The sustainable availability of raw materials used in manufacturing advanced products is a question that consumers will raise more and more in the future. In order to answer this legitimate request it is ... [more ▼]

The sustainable availability of raw materials used in manufacturing advanced products is a question that consumers will raise more and more in the future. In order to answer this legitimate request it is mandatory to define characterization factors capable of taking into account the geological scarcity of an element but also the social and environmental impact of its exploitation and beneficiation. Recent studies (Vieira et al. 2012; Swart el al. 2013) have focused on decreasing ore grades as rough indicators, but clearly such indicators can be severely biased by breakthrough innovations in mining technologies as well as by high metal prices generated by increasing demand. In this paper, we will briefly review three metals that could technically be extracted from very different social and natural environments: Germanium is nowadays mainly a byproduct of coal burnt in China, but could as well be gained from alternative sources such as zinc sulfides. Aluminium is produced from bauxite with Gallium as a byproduct but could technically be extracted from alternative resources such as regionally available clays. Finally, the world nickel production follows two very different processing routes starting either from silicates (laterite deposits) or from sulfides (ultramafic magmas). By comparing the geological; environmental and social impact of mining operations for these three metals, we will try to show what is hidden behind simple ore grades and what indicators should be taken into account in a more complex analysis of sustainable availability. The intention is to build a geographical information system (GIS) of mineral resources and mining operations to help product manufacturers in properly selecting their raw materials providers. Vieira, M.D.M., Goedkoop, M.J., Storm, P. and Huijbregts, M.A.J., 2012, Ore grade decrease as a life cycle impact indicator for metal scarcity : The case of copper. Environ. Sci. Technol. 46, 12772-12778 Swart, P. and Dewulf, J., 2013, Quantifying the impacts of primary metal resource use in life cycle assessment based on recent mining data. Resources, Conservation and Recycling, 73, 180-187. [less ▲]

Detailed reference viewed: 19 (5 ULg)
Peer Reviewed
See detailFemmes auteures d’homicide en détention : des liens d’attachement aux ruptures de liens
Glowacz, Fabienne ULg; Bernardello, Sandrine; Résimont, Isabelle

Poster (2014, May)

Detailed reference viewed: 12 (2 ULg)
Peer Reviewed
See detailGrade retention at the transition to secondary school: A quasi-experimental study of its consequences on relationships with parents and peers
Lecocq, Aurélie; Mathys, Cécile ULg; Véronneau, Marie-Hélène

Conference (2014, May)

Detailed reference viewed: 7 (0 ULg)
Full Text
Peer Reviewed
See detailCinacalcet treatment at the time of transplantation is associated with a significant risk of delayed graft function in kidney transplant recipients
Jouret, François ULg; WEEKERS, Laurent ULg; GROSCH, Stéphanie ULg et al

in Transplant International (2014, May), 27(S1), 167

The calcium-sensing receptor (CaSR) has been implicated in the ischemia/ reperfusion (I/R) cascade in heart, liver and brain. Renal I/R occurs at the time of transplantation (Tx), with a deleterious ... [more ▼]

The calcium-sensing receptor (CaSR) has been implicated in the ischemia/ reperfusion (I/R) cascade in heart, liver and brain. Renal I/R occurs at the time of transplantation (Tx), with a deleterious impact on early graft function. Here, we retrospectively investigated if the use of cinacalcet, a CaSR agonist, in kidney transplant recipients (KTR) influences early graft recovery. All KTR from 2007 to 2012 in our Academic Hospital were prospectively included in a database. Patients actively treated with cinacalcet on the day of Tx were retrospectively identified from this database and matched with controls on (i) type of donor (living [LD], deceased after brain or circulatory death [DCD]); (ii) cold ischemic time (CIT) ` 1 h; (iii) residual diuresis (` 500 ml); and (iv) donor age (` 5 years). Delayed graft function (DGF) was defined as dialysis requirement after Tx. Baseline characteristics were compared between groups with student’s t-test or Chi-2 as appropriate. The endpoint was the percentage of DGF in both groups. Among 337 KTR, 36 (10.7%) were treated with cinacalcet at Tx. Control group included 61 patients. Characteristics of patients and donors are summarized in the table. DGF occurred in 42 and 23% of cinacalcet-treated and control groups, respectively (p = 0.05). These retro- spective observations suggest that CaSR activation at the time of Tx impairs early graft recovery. [less ▲]

Detailed reference viewed: 27 (13 ULg)
Full Text
See detailSEDIMENTS OXIDATION BY SEAGRASSES: INFLUENCE ON THE S CYCLE IN POSIDONIA OCEANICA (L.) DELILE INTERMATTES DYNAMIC
Abadie, Arnaud ULg; Lejeune, Pierre; Pergent, Gérard et al

Poster (2014, May)

The Mediterranean seagrass Posidonia oceanica forms meadows and develops a complex of rhizomes, roots and sediment which is called “matte”. P. oceanica meadows show discontinuity patterns in the form of ... [more ▼]

The Mediterranean seagrass Posidonia oceanica forms meadows and develops a complex of rhizomes, roots and sediment which is called “matte”. P. oceanica meadows show discontinuity patterns in the form of sand or dead matte (matte without living shoots) patches, called “intermattes”, which can have natural or anthropogenic origins. Mechanical processes (e. g. currents, anchoring) can initiate intermattes formation but their dynamic after creation seems to be linked with the sediment chemistry, especially with S cycle. P. oceanica plays an important role in controlling coastal belowground biogeochemistry, in particular by oxidizing sediments through the release of O2 by roots. This process allows creating more suitable condition for plant growth and colonization. The lack of H2S oxidation in SO4 2- can lead to limitation of the plant development or its regression. In order to investigate the effect of oxidation condition in sediments on intermattes dynamic and the neighboring meadow, we initiate, in December 2013, a study on six intermattes (three natural, three anthropogenic) at different depths in Calvi Bay, in Corsica (France). We hypothesize that redox potential and H2S concentration in sediments play an important role in the regression of P. oceanica meadows, particularly after a mechanical anthropic impact like anchoring. It also may be possible that two different kinds of processes are involved for each type of intermatte. Regular samplings throughout two years are planed with the aim of evaluating the seasonal variations of physicochemical parameters. [less ▲]

Detailed reference viewed: 26 (11 ULg)
Peer Reviewed
See detailEvent justice and social entity justice: A cross-lagged analysis
Marzucco, Laurence ULg; Hansez, Isabelle ULg

Poster (2014, May)

ABSTRACT This study aimed to examine the directionality of the relationship between event justice and social entity justice. Using two samples and a cross-lagged panel analysis with two measurement times ... [more ▼]

ABSTRACT This study aimed to examine the directionality of the relationship between event justice and social entity justice. Using two samples and a cross-lagged panel analysis with two measurement times, social entity justice was found to predict event justice (procedural, distributive, interpersonal and informational justice event), supporting the top-down process. PRESS PARAGRAPH The life of organizations is punctuated by a wide range of managerial decisions (e.g., hiring, performance appraisal or organizational change). Facing such events, employees evaluate the fairness of the situation experienced. However, little is known about how employees develop justice judgments. This study shows that employees’ fairness perceptions about their organization influence their interpretation of the fairness of subsequent events involving the organization. Building and fostering a climate of justice is therefore of primary importance for organizations, since global fairness perceptions about the organization may help employees to perceive a specific event, such as a managerial decision, as being fair. [less ▲]

Detailed reference viewed: 28 (2 ULg)
Full Text
See detailSeeking for causes of recent methane increase: comparison between GEOS-Chem tagged simulations and FTIR column measurements above Jungfraujoch
Bader, Whitney ULg; Bovy, Benoît ULg; Wecht, K et al

Poster (2014, May)

Atmospheric CH4 reached 260% of the pre-industrial level (~700 ppb) due to increased emissions from anthropogenic sources. Globally averaged CH4 reached a new high of 1819 ± 1 ppb in 2012, an increase of ... [more ▼]

Atmospheric CH4 reached 260% of the pre-industrial level (~700 ppb) due to increased emissions from anthropogenic sources. Globally averaged CH4 reached a new high of 1819 ± 1 ppb in 2012, an increase of 6 ppb with respect to the previous year (WMO, Greenhouse gas Bulletin N.9, 2013). CH4 above Jungfraujoch increases at 0.53±0.19%/year during the late 90s to stabilize and reach a non significant trend from 2000 to 2005. Since 2006, atmospheric methane has been continuously increasing with a rate of 0.19±0.05 %/year. The attribution of this increase to any CH4 source is difficult since the current network is insufficient to characterize emissions by region and source process, emphasizing the need for source-tagged model simulations as it should provide us information on processes causing the increase of atmospheric methane since 2005/2006. [less ▲]

Detailed reference viewed: 32 (3 ULg)
Peer Reviewed
See detailOutplacement adequacy and benefits: The mediating role of retrospective justice
Marzucco, Laurence ULg; Hansez, Isabelle ULg

Poster (2014, May)

ABSTRACT We examined the relationships between perceived outplacement adequacy, retrospective justice and outplacement benefits for redundant employees using outplacement services. Based on an ... [more ▼]

ABSTRACT We examined the relationships between perceived outplacement adequacy, retrospective justice and outplacement benefits for redundant employees using outplacement services. Based on an outplacement experience perceived as adequate, victims formed retrospective justice perceptions about their former organization that in turn, impacted their negative emotions, well-being, future perspectives and job search. PRESS PARAGRAPH The increasing prevalence of organizational downsizing has been matched by growth in the provision of outplacement services over the last decade. Despite this rapid growth and ongoing need for outplacement services, little is yet known about the perceived adequacy and the benefits of these services for redundant employees using them. Our results indicated that an outplacement experience perceived as adequate for redundant employees retrospectively fosters their impressions of justice about the dismissing organization; this leads in turn to satisfactory benefits for them: reduction of negative emotions, enhancement of their perceived well-being, future perspectives, and job-seeking activities. [less ▲]

Detailed reference viewed: 41 (0 ULg)
Full Text
Peer Reviewed
See detailEstimating the revenues of a hydrogen-based high-capacity storage device: methodology and results
François-Lavet, Vincent ULg; Fonteneau, Raphaël ULg; Ernst, Damien ULg

in Proceedings des 9èmes Journée Francophones de Planification, Décision et Apprentissage (2014, May)

This paper proposes a methodology to estimate the maximum revenue that can be generated by a company that operates a high-capacity storage device to buy or sell electricity on the day-ahead electricity ... [more ▼]

This paper proposes a methodology to estimate the maximum revenue that can be generated by a company that operates a high-capacity storage device to buy or sell electricity on the day-ahead electricity market. The methodology exploits the Dynamic Programming (DP) principle and is specified for hydrogen-based storage devices that use electrolysis to produce hydrogen and fuel cells to generate electricity from hydrogen. Experimental results are generated using historical data of energy prices on the Belgian market. They show how the storage capacity and other parameters of the storage device influence the optimal revenue. The main conclusion drawn from the experiments is that it may be interesting to invest in large storage tanks to exploit the inter-seasonal price fluctuations of electricity. [less ▲]

Detailed reference viewed: 42 (21 ULg)
Full Text
See detailExpression of peroxisome-proliferator activated receptor alpha in pituitary tumours
Rotondi, S; Modarelli, A; Rostomyan, L et al

in Endocrine Abstracts (2014, May)

Detailed reference viewed: 4 (0 ULg)
Full Text
Peer Reviewed
See detailDioxins and PCBs in eel and Chinese mitten crabs in the Rhine-Meuse estuary
van Hattum, B; Nijssen, P; Focant, Jean-François ULg et al

Poster (2014, May)

Detailed reference viewed: 7 (1 ULg)