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See detailSemantic relatedness of the memoranda prevents older adults from benefitting from unitization
Delhaye, Emma ULg; Tibon, Roni; Gronau, Nurit et al

Poster (2016)

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See detailA novel protocol for the design of artificial (β/α)8-barrel proteins
Martina, Cristina ULg; Figueroa Yévenes, Maximiliano ULg; Moretti, Rocco et al

Poster (2016)

The design of protein de novo is an emerging field in biochemistry, where artificial proteins are first designed in silico and then validated experimentally. This research, which rests mainly on our ... [more ▼]

The design of protein de novo is an emerging field in biochemistry, where artificial proteins are first designed in silico and then validated experimentally. This research, which rests mainly on our current understanding of protein structure, function, folding, stability and solubility, contributes to expand our knowledge of proteins in general. Our group has a long tradition in the design of artificial (β/α)8 -barrel proteins (called Octarellins). This fold is extremely interesting because it is widespread in nature (10% of the known proteins contain this fold) and in catalysis (it is present in 5/6 classes of enzyme). Here we present a protocol to design de novo (β/α)8-barrels with the more recent and best performing tools: Rosetta and Modeller (modelling softwares), and GROMACS (molecular dynamic simulations). First, 4000 artificial backbone structures were created with the use of modelling packages Rosetta and Modeller. 54 out of them were selected as targets for the following steps of sequence design and energy minimization (10 cycles), in order to find the best sequence to fit each target. More than 10000 different artificial sequences were created. Selection steps were performed in order to reduce the number of candidates for each target and the best ones were subjected to molecular dynamic simulation. Among this, 5 models were finally chosen for gene synthesis and experimental validation, and are currently being tested for expression in E. coli and preliminary purification. [less ▲]

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See detailChanges in the structure and the composition of microtubules within supporting cells of the organ of hearing during development.
Renauld, Justine ULg; Freeman, Stephen ULg; Thelen, Nicolas ULg et al

Poster (2016)

The auditory organ is a highly specialized structure composed by specific cellular types. The sensory cells are characterized by stereocilia at their apex and are necessary for the sound perception. These ... [more ▼]

The auditory organ is a highly specialized structure composed by specific cellular types. The sensory cells are characterized by stereocilia at their apex and are necessary for the sound perception. These cells are supported by supporting cells which contain up to 3000 microtubules and are formed by 15protofilaments (15pf) instead of the canonical 13, a unique fact among vertebrates. It was shown that a β-tubulin isoform can specify the microtubule architecture, such as the expression of the Moth β2 in the Drosophila testes imposed the 16pf structure on the corresponding subset of Drosophila microtubules, which normally contain 13pf. To determine the role of these tubulins in the auditory organ and their possible involvement in the formation of the unusual 15pf microtubules of supporting cells, we studied the spatiotemporal localization of five -tubulin isotypes (β1 to 5) as well as acetyl-α-tubulin within the hearing organ during development in rodents. By using confocal microscopy, we showed that with the exception of the β3-tubulin isoform that was specific to nerve fibres, all the different β-tubulin isoforms and acetyl-α-tubulin were mainly present in the supporting cells. Contrary to β1-4-tubulins, we also found that the β5-tubulin isoform appeared only at a key stage of the postnatal development. By using transmission electron microscopy, we examined the fine structure of microtubules at an early and a late postnatal stage. Our TEM study indicated that these cells are composed by 13pf microtubules at P2, but by 15pf microtubules at P25. We revealed further that this developmental stage coincide with the formation of two separate bundles of microtubules from a unique one in these supporting cells. In conclusion, the architecture and composition of microtubules present in the supporting cells change during development of the organ of Corti. Further experiments are now required to determine if these changes are related to the appearance of β5-tubulin. [less ▲]

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See detailInsights into a million-year-scale Rhenohercynian carbonate platform evolution through a multi-disciplinary approach: example of a GIvetian carbonate record from Belgium
Pas, Damien ULg; Da Silva, Anne-Christine ULg; Devleeschouwer, Xavier et al

Poster (2016)

In this study we formulate answers to three important questions related to Givetian carbonate records and their use for reconstructing million-year past palaeoenvironmental changes. First, we provide ... [more ▼]

In this study we formulate answers to three important questions related to Givetian carbonate records and their use for reconstructing million-year past palaeoenvironmental changes. First, we provide detailed illustrations of the fascinating depositional diversity that shaped a shallow reefal platform during the early- to late-Givetian in the Rhenohercynian Ocean; secondly we improve the sedimentological model of the Givetian carbonate platform in the Dinant Basin (Belgium) and thirdly we evaluate the application of magnetic susceptibility (MS) as a tool for long-term trends, correlation, and palaeoenvironmental reconstruction. These three goals are reached by making a detailed sedimentological, geophysical and geochemical study of the La Thure quarry. Petrographic analyses revealed eighteen microfacies which represent a carbonate platform evolution through early-late Givetian time, ranging from a homoclinal ramp to a discontinuously rimmed shelf and then a drowning shelf. These results allowed us to illustrate the fascinating environmental diversity that shaped one the largest carbonate platforms of Europe and provide an up to date model of the vertical and lateral development of the Belgian Givetian platform. Early-late Givetian La Thure sequence reveals five main depositional intervals, which could be correlated with the southern margin of the platform. These correlations allowed us to define the facies belts distribution, the major depositional changes that affected this platform and to highlight the Taghanic Event. Palaeo-redox proxies reveal a significant change in the oxygenation level, from oxygen-depleted to more oxic condition, between middle and late Givetian. This change is well-correlated with an increase in global temperature in the late Mid Devonian. Combination of MS and geochemistry demonstrates the inherent-parallel link existing between variation in MS values and proxies for siliciclastic input (such as Si, Al). Collected geochemical and MS data confirm that the La Thure can be considered as a key section for the internal shelf setting in the Rhenohercynian Ocean bordering Laurussia’s south-eastern margin. [less ▲]

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See detailCystatin C standardization decreases assay variation and improves assessment of GFR
Ebert, N; DELANAYE, Pierre ULg; Shlipak, M et al

Poster (2016)

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See detailThe effect of aging on associative memory for semantically-related word pairs
Folville, Adrien; Delhaye, Emma ULg; Bastin, Christine ULg

Poster (2016)

Detailed reference viewed: 56 (9 ULg)
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See detailThe Influence of the Perceived School Climate on Adolescents' Academic Achievement: Testing the Mediating Role of Intrinsic School Motivation
Vaillancourt, Marie-Claire; Blanchette-Luong, Vanessa; Véronneau, Marie-Hélène et al

Poster (2016)

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See detailCharacterisation of a secondary carotenoid producer microalga of the genus Coelastrella
Corato, Amélie ULg

Poster (2016)

Some green microalgae synthesize secondary carotenoids as protecting agents under stress. These pigments have high value as feed supplement for aquaculture and as health products. The most promising ... [more ▼]

Some green microalgae synthesize secondary carotenoids as protecting agents under stress. These pigments have high value as feed supplement for aquaculture and as health products. The most promising pigment is astaxanthin, because of its antioxidant, antitumoral and anti-inflamatory properties. The most used natural source of this pigment is the microalga Haematococcus pluvialis. However this species grows slowly and lacks robustness for easy cultivation. Therefore, other species are investigated for astaxanthin production. Here, we identified a locally isolated strain as Coelastrella sp. that is a secondary carotenoid producer. [1] A known typical feature of this genus, that we could observed in the strain by scanning electron microcopy, is the presence of meridional ribs. [2] We analyzed the culture conditions and concluded that this strain grows both autotrophically and heterotrophically and is able of fast change in pigment composition under controlled stress conditions. Thanks to HPLC analyses, we determined that the strain accumulates a variety of secondary carotenoids, among which: astaxanthin, cantaxanthin and echinenone. Unidentified compounds will be further analyzed by mass spectrometry. [less ▲]

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See detailImpacts of wheel traffic on the physical properties of a Luvisol under reduced and conventional tillage
Saur, Marie-Laure ULg; Destain, Marie-France ULg; Roisin, Christian et al

Poster (2016)

Soil compaction is a complex mechanism which results in a decrease of soil porosity and an increase of soil strength. Such effects may reduce crop yield since they are harmful for root growth, germination ... [more ▼]

Soil compaction is a complex mechanism which results in a decrease of soil porosity and an increase of soil strength. Such effects may reduce crop yield since they are harmful for root growth, germination, mesofauna and bacterial life. Soil compaction may also reduce hydraulic conductivity which increases the risk of runoff, contamination of surface water, erosion and emission of greenhouse gases due to anaerobic processes. In the context of sustainable agriculture, it is crucial to characterise the impact of the agricultural techniques on the compaction state in the arable layer due to machine traffic. For this purpose, Soil samples were taken in a Luvisol at different depths, on plots under longterm reduced tillage (RT) and conventional tillage (CT). The impact of wheel traffic on the physical properties of the soils was also studied. The experimental approach consists in measuring traditional macroscopic soil properties such as bulk density and precompression stress, and combining them with pore size distribution obtained by mercury intrusion porosimetry. Automatic cone index measurements were initially performed to map the soil resistance and easily identify the sampling depths. The measurements revealed a plough pan at 30-cm depth under both CT and RT. Nevertheless, the subsoil under RT showed pieces of evidence of a natural regeneration process of the microporosity. The impact of wheel traffic was studied in RT and CT plots. It was shown that the passage of heavy machine such as beet harvester coupled to water content close to the optimum proctor is clearly unfavourable in terms of compaction. The measurements revealed large modifications of soil structure in the topsoil of CT, whereas the soil structure slightly changes through depth. However, the latter remains the more problematic case since the soil will not be loosened by tillage anymore, resulting in strongly compacted soil years after years. In addition to the experimental approach, numerical modelling was used in order to predict the soil compaction. A finite element method was used and the soil behaviour was modelled by an elastoplastic law (modified Cam-Clay model). The model parameters were calibrated from the experimental measurements. The simulations allowed to compare the porosity and the surface deformation after wheel traffic with the experiments. The variations of machine weight and tyre pressure were numerically studied and it was showed that the machine weight has an influence in the topsoil and the subsoil, whereas the tyre pressure affects only the topsoil. [less ▲]

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See detailThe paradoxes of clam farming in Thaibinh Province, Vietnam
Ngo Thi Thu Hang, ULg; Tran Huu Cuong; Lebailly, Philippe ULg

Poster (2016)

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See detailAre Survivors Easier to Control? Why the Association of Glycemia and Mortality in Critical Care is Real
Uyttendaele, Vincent ULg; Dickson, Jennifer; Stewart, Kent et al

Poster (2016)

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See detailSleep deprivation affects brain global cortical responsiveness
Gaggioni, Giulia ULg; Chellappa; Ly et al

Poster (2016)

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See detailGenetic differentiation of native and introduced populations of Quercus rubra L
Merceron, Nastasia ULg

Poster (2016)

Native to North America, Northern red oak (Quercus rubra) was introduced in Europe in the XVIIth century for ornamental and forestry purposes. This species is now widespread in European forests due to ... [more ▼]

Native to North America, Northern red oak (Quercus rubra) was introduced in Europe in the XVIIth century for ornamental and forestry purposes. This species is now widespread in European forests due to plantations and natural regeneration. In invasive herbaceous plants, introduced populations are often genetically different from native populations. However, this has been poorly investigated in exotic tree species. Our objective was to explore the phenotypic variation between native and introduced populations of Q. rubra and to test for adaptation to the new environmental conditions since the introduction. We used three progeny test gardens, in South-Western, Central and North-Eastern France, composed of 106 American and European populations with 1-25 families per population. The gardens were settled from 1980s and trees were monitored regularly for growth (diameter, height) and leaf phenology (budburst, coloration). Since trees had reached sexual maturity, we have monitored acorn production for two years. Within each garden, data were analyzed using mixed analyses of variance; Qst indexes were calculated to evaluate genetic differentiation between populations. Overall, introduced populations presented higher trait values than native populations: growth rate was higher and spring phenology was advanced. Fruit set was higher in introduced trees, although depending of the year. Qst estimates clearly demonstrated the existence of a high genetic differentiation between native populations, for growth and phenology. Introduced populations presented a lower level of differentiation than native populations. These results suggest several hypotheses: (i) introduced populations only represent a part of the global diversity existing in the native range (ii) populations have evolved since introduction under new environmental selective pressures (ii) populations were selected by man since introduction. These hypotheses are being investigated, notably through a molecular approach. [less ▲]

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See detailGalectin-1 is involved in osteoclast biology
Muller, Joséphine ULg; Binsfeld, Marilène; DUBOIS, Sophie ULg et al

Poster (2016)

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See detailFaire preuve de réflexion éthique pour poser un acte professionnel : une compétence transversale développée tout au long du Master en logopédie
Martinez Perez, Trecy ULg; Leclercq, Anne-Lise ULg; Leroy, Sandrine ULg et al

Poster (2016)

Le code éthique de la profession constitue un point de départ pour guider les actes mais le professionnel de la santé doit régulièrement aller au-delà de celui-ci et faire preuve de réflexion pour ... [more ▼]

Le code éthique de la profession constitue un point de départ pour guider les actes mais le professionnel de la santé doit régulièrement aller au-delà de celui-ci et faire preuve de réflexion pour analyser les situations complexes au niveau moral qui peuvent survenir (Purtilo & Doherty., 2011). L’équipe enseignante du Master en Logopédie de l’Université de Liège (Belgique) a souhaité travailler cette compétence transversale chez les étudiants au cours des cinq années du Master en Logopédie à travers plusieurs dispositifs d’apprentissage complémentaires. Tout d’abord, au cours du Bachelier, l’étudiant est amené à découvrir le code éthique et déontologique de la profession, à identifier les principes de ce code dans une situation professionnelle ciblée puis dans une variété de situations professionnelles. Ensuite, au cours du Master, l’étudiant est amené à inclure une réflexion éthique dans les actes qu’il pose durant ses stages sur le terrain (en contexte monodisciplinaire puis en contexte multidisciplinaire), à discuter des principes dans un contexte d’intervision/supervision avec d’autres étudiants et un tuteur (pour un dispositif similaire en Sciences infirmières, voir Blomberg & Bisholt, 2015) et, finalement, à susciter une réflexion critique chez ses pairs sur une question éthique et déontologique. Ces dispositifs d’apprentissage et leur complémentarité, ainsi que les perspectives d’évaluation seront développés dans le poster. [less ▲]

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See detailComparison between model simulations and observations of tracer transport using MRI in the root zone.
Vanderborght, Jan; Koch, Axelle; Haber-Pohlmeier, Sabine et al

Poster (2016)

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See detailPhenotypic differentiation of native and introduced populations of Quercus rubra L.
Merceron, Nastasia ULg

Poster (2016)

Native to North America, Northern red oak (Quercus rubra) was introduced in Europe in the XVIIth century for ornamental and forestry purposes. This species is now widespread in European forests due to ... [more ▼]

Native to North America, Northern red oak (Quercus rubra) was introduced in Europe in the XVIIth century for ornamental and forestry purposes. This species is now widespread in European forests due to plantations and natural regeneration. In invasive herbaceous plants, introduced populations are often genetically different from native populations. However, this has been poorly investigated in exotic tree species. Our objective was to explore the phenotypic variation between native and introduced populations of Q. rubra and to test for adaptation to the new environmental conditions since the introduction. We used three progeny test gardens, in South-Western, Central and North-Eastern France, composed of 64 American and 77 European populations. The gardens were settled from 1980s and trees were monitored regularly for growth (diameter, height) and leaf phenology (budburst, coloration). For two years, we have monitored acorn production. Within each garden, data were analyzed using mixed analyses of variance; Qst indexes were calculated to evaluate genetic differentiation between populations. Overall, introduced populations presented higher trait values than native populations: growth rate was higher and spring phenology was advanced. Fruit set was higher in introduced trees, although depending of the year. Qst estimates clearly demonstrated the existence of a high genetic differentiation between native populations, for growth and phenology. Introduced populations presented a lower level of differentiation, significant for phenology, but not for growth. These results suggest several hypotheses: (i) introduced populations only represent a part of the global diversity existing in the native range (ii) populations have evolved since introduction under new environmental selective pressures (ii) populations were selected by man since introduction. These hypotheses are being investigated, notably through a molecular approach. [less ▲]

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See detailPupil size dynamics during prolonged wakefulness reflects the dual interaction of sleep-homeostasis and the circadian timing system and is related to cortical excitability
Van Egroo, Maxime ULg; Cespedes-Ortiz, Cristian ULg; Ly, Julien et al

Poster (2016)

Objective. We sought to characterize daily variations in pupil size as a function of sleep need and circadian phase. We also assessed second-to-second pupil size variability during prolonged wakefulness ... [more ▼]

Objective. We sought to characterize daily variations in pupil size as a function of sleep need and circadian phase. We also assessed second-to-second pupil size variability during prolonged wakefulness. Methods. Twenty-two healthy young men (22 y.o. ± 2.6) followed a 29h sleep deprivation protocol under constant routine conditions. On twelve occasions, pupil size was recorded (90 Hz sampling rate) while fixating a dot and suppressing eye blinks. Following automatic eye blink and artefact rejection, mean pupil size and average point to point variation in pupil size data were computed. Data were realigned according to individual dim-light melatonin onset determined based on hourly saliva samples. Results. Preliminary analyses indicate that both mean pupil size and pupil size variability show a main effect of circadian phase (PROC MIXED; n = 20; F11,206 > 4.4, p < 0.001). Post hoc analyses show that mean pupil size and pupil size variability increase up to the evening wake maintenance prior to decreasing until the early morning around the putative sleep promoting zone. Conclusion. These data confirm the pupil size and pupil size variability reflect the dual interaction of sleep homeostasis and the circadian timing system. Further analyses will determine how pupil size dynamics relates to makers of brain function. [less ▲]

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See detailIdentification d’indicateurs de la transition forestière en lien avec les impacts de la déforestation sur les socio-écosystèmes en Afrique centrale
Gillet, Pauline ULg; Vermeulen, Cédric ULg

Poster (2015, December 26)

La théorie de la transition forestière lie l’évolution du couvert forestier au temps (Mather, 1992). Dans la première phase, le couvert forestier est très dense. Il diminue ensuite avec l’augmentation de ... [more ▼]

La théorie de la transition forestière lie l’évolution du couvert forestier au temps (Mather, 1992). Dans la première phase, le couvert forestier est très dense. Il diminue ensuite avec l’augmentation de la densité de population qui pratique la défriche pour la production agricole et utilise le bois pour répondre aux besoins en énergie et en bois d’œuvre. Dans un troisième temps, l’économie se spécialise, l’agriculture s’intensifie et est pratiquée sur les terres les plus productives et le rôle de l’écosystème forestier dans l’économie diminue. L’abandon des terres les moins productives permet la recolonisation forestière visible sur la courbe de transition. La présente étude tente d’identifier et de proposer des indicateurs d’occupation spatiale permettant, sur base d’images de télédétection, de prévoir la position réelle d’un site sur la courbe de transition forestière. Ensuite, l’étude des socio-écosystèmes en lien avec la transition forestière permet de démontrer l’impact de la diminution du couvert forestier sur le fonctionnement des sociétés humaines. Nous nous sommes penchés sur différents aspects caractérisant les activités des populations locales dans trois sites d’étude situés sur un gradient de déforestation en Afrique centrale tels que la composition de repas et l’origine des aliments. On observe que la déforestation induit une diminution des composants issus des activités fortement liées à l’écosystème telles que la chasse, la pêche ou la collecte au profit de l’agriculture et de l’élevage. [less ▲]

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See detailOrganocatalytic coupling of carbon dioxide with epoxides: the unexpected booster effect of fluoroalcohols
Grignard, Bruno ULg; Gennen, Sandro ULg; Alves, Margot ULg et al

Poster (2015, December 19)

Valorising CO2 as a C1 feedstock for producing added value building blocks is seducing as it is a free and in exhaustive waste resulting from human activity. Carbon dioxide is a thermodynamically and ... [more ▼]

Valorising CO2 as a C1 feedstock for producing added value building blocks is seducing as it is a free and in exhaustive waste resulting from human activity. Carbon dioxide is a thermodynamically and kinetically stable molecule that can be converted into cyclic carbonates by coupling with epoxides. Cyclic carbonates are valuable products that find applications as solvents, electrolytes or as monomers for polyurethanes synthesis. Although the CO2/epoxide coupling reaction has been extensively studied, the development of organocatalysts that are highly efficient under mild experimental conditions still remains a challenge. Onium salts are the most common catalysts that show reasonable catalytic activity at high pressure (> 100 bars) and high temperature (> 100°C) only. Fortunately, the efficiency of these organocatalysts can be improved by addition of appropriate hydrogen bond donors activators (HBD). In this talk, we will report the development of a new highly efficient catalytic platform consisting in an onium halide salt combined with HBD activators for the fast and solvent-free synthesis of cyclic carbonates by coupling CO2 with epoxides. The cocatalytic effect of series of HBDs will be demonstrated by detailed online kinetics studies under pressure using Raman or IR spectroscopy. We will show that our new organocatalytic platform facilitates the fast conversion of epoxy groups into cyclic carbonates under mild experimental conditions, and can be easily implemented to the modification of epoxidized vegetable oils. The synergistic effects between HBDs and onium salt will be highlighted by a detailed mechanistic study of the reaction through DFT calculations. [less ▲]

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See detailHeat tracer and solute tests in an alluvial aquifer: field experiment and inverse modelling
Dassargues, Alain ULg; Klepikova, Maria; Jamin, Pierre ULg et al

Poster (2015, December 18)

Using heat as an active tracer in different types of aquifers is a topic of increasing interest. In this study, we investigate the potential interest of using heat tracer tests for characterization of a ... [more ▼]

Using heat as an active tracer in different types of aquifers is a topic of increasing interest. In this study, we investigate the potential interest of using heat tracer tests for characterization of a shallow alluvial aquifer. A thermal tracer test was conducted in the alluvial aquifer of the Meuse River, Belgium. The tracing experiment consisted in simultaneously injecting heated water and a dye tracer in a piezometer and monitoring the evolution of groundwater temperature and tracer concentration in the recovery well and in monitoring wells. To get insights in the 3D characteristics of the heat transport mechanisms the space-filling arrangement of observation wells was used. The breakthrough curves measured in the recovery well showed that heat transfer in the alluvial aquifer is slower and more dispersive than solute transport. Recovery is very low for heat while in the same time it is measured as relatively high for the solute tracer. This is due to the fact that heat diffusion is larger than molecular diffusion, implying that exchange between groundwater and the porous medium matrix is far more significant for heat than for solute tracers. Temperature breakthrough curves in other piezometers are contrasted with what would be expected in an ideal layered aquifer. They reveal strongly unequal lateral and vertical components of the transport mechanisms. The observed complex behavior of the heat plume was explained by the groundwater flow gradient on the site and heterogeneities of hydraulic conductivity field. By using numerical model of heat and flow coupled with pilot points inverse approach main preferential paths were characterized. [less ▲]

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See detailQUANTIFYING CHEMICAL REACTIONS BY USING MIXING ANALYSIS IN GROUNDWATER-RIVER INTERFACE
Jurado Elices, Anna ULg; Vázquez-Suñé, Enric; Carrera, Jesus et al

Poster (2015, December 16)

This work is motivated by a sound understanding of the chemical processes that affect the organic pollutants in an urban aquifer. Urban aquifers may suffer pollution from different recharge sources such ... [more ▼]

This work is motivated by a sound understanding of the chemical processes that affect the organic pollutants in an urban aquifer. Urban aquifers may suffer pollution from different recharge sources such as leakage from sewer and septic systems, seepage from rivers, seawater intrusion, and losses from water supply network. As a result, a wide range of organic pollutants are found in urban aquifers (Fig. 1). Since these pollutants reach groundwater environment, their occurrence depends on simultaneous transport and biogeochemical processes. However, the quantification of these processes is not an easy task. The objective of this work is to propose an approach to quantify the chemical processes that occurs when river water infiltrates an aquifer. [less ▲]

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See detailFirst Analysis of Martian Nightglow Seasonal Variations Observed by MAVEN's Imaging Ultraviolet Spectrograph
Stiepen, Arnaud ULg; IUVS team

Poster (2015, December 15)

We report results from a study of nitric oxide nightglow over the northern hemisphere of Mars during winter and southern hemisphere during equinox. We present observations of the nitric oxide δ and γ band ... [more ▼]

We report results from a study of nitric oxide nightglow over the northern hemisphere of Mars during winter and southern hemisphere during equinox. We present observations of the nitric oxide δ and γ band emissions between 190 and 270 nm by the Imaging UltraViolet Spectrograph on the MAVEN spacecraft. The emission reveals recombination of N and O atoms dissociated on the dayside of Mars, and is known to trace upper atmosphere hemispheric circulation patterns. We extend previous studies to higher latitudes, finding brighter emissions closer to the poles as predicted from global circulation models. Statistically significant variability suggests variation of the fluxes of N and O carried from the dayside thermosphere, as well as possible variations of the wind pattern in the nightside thermosphere and mesosphere. [less ▲]

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See detailEvaluating the performance of short-term heat storage in alluvial aquifer with 4D electrical resistivity tomography and hydrological monitoring
Robert, Tanguy; Paulus, Claire; Bolly, Pierre-Yves et al

Poster (2015, December 14)

In the context of energy demand side management (DSM), energy storage solutions are needed to stock energy during high production periods and recover energy during high demand periods. Among currently ... [more ▼]

In the context of energy demand side management (DSM), energy storage solutions are needed to stock energy during high production periods and recover energy during high demand periods. Among currently studied solutions, storing energy in the subsurface through heat pumps and/or exchangers (thermal energy storage) is relatively simple with low investment costs. However, the design and functioning of such systems have strong interconnections with the geology of the site which may be complex and heterogeneous, making predictions difficult. In this context, local temperature measurements are necessary but not sufficient to model heat flow and transport in the subsurface. Electrical resistivity tomography (ERT) provides spatially distributed information on the temperature distribution in the subsurface. In this study, we monitored, with 4D ERT combined with multiple hydrological measurements in available wells, a short-term heat storage experiment in a confined alluvial aquifer. We injected heated water (ΔT=30K) during 6 hours with a rate of 3 m³/h, stored during 3 days, and then we pumped it back to estimate the energy balance. We collected ERT data sets using 9 parallel profiles of 21 electrodes and cross-lines measurements. Inversion results clearly show the ability of ERT to delimit the thermal plume growth during injection, the diffusion and decrease of temperature during storage, and the decrease in size after pumping. Quantitative interpretation of ERT is difficult at this stage due to strong spatial variations of the total dissolved solid content in the aquifer, due to historical chloride contamination of the site. Energy balance shows that up to 75% of the energy can be easily recovered with an adapted strategy in the context of DSM. Short-term heat storage in alluvial aquifer is efficient and ERT is a valuable tool to image and estimate the temperature distribution in the subsurface. [less ▲]

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See detailINVESTIGATING MODEL DEFICIENCIES IN THE GLOBAL BUDGET OF ETHANE
Tzompa-Sosa, Z. A.; Keller, C. A.; Turner, A. J. et al

Poster (2015, December 14)

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See detailAnalyse de la répartition spatiale des restes fauniques du site éémien de Caours. Apport des systèmes d'information géographique.
Moreau, Gwénaëlle ULg

Poster (2015, December 12)

The Palaeolithic deposit of Caours, located in the Somme, is the only Eemian site in Northern Europe in interglacial context. This site show an incredible conservation of faunal remains spread out over a ... [more ▼]

The Palaeolithic deposit of Caours, located in the Somme, is the only Eemian site in Northern Europe in interglacial context. This site show an incredible conservation of faunal remains spread out over a large area and a recurrence Human occupation. That gave us a large amount of data about this period of Neanderthal history. We now questioning about the choice of this locality and the spatial organisation of Neanderthal. Then, spatial analysis using the Geographic Information System (GIS) appear to being a useful tool to answer it. We show the consequent availability of water, prey and tool raw material. Neanderthalians was opportunistic hunters of cervidae. There has also eat a heavier prey as aurochs and rhino by trapping or scavenging. Then Neanderthal of Caours butchering with tool made in-situ eating the meat and the marrow. [less ▲]

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See detailEvolution récente du trait de côte dans le Golfe de Guinée: Exemple du Togo et du Bénin (2000-2015)
Ozer, Pierre ULg; Hountondji, Yvon-Carmen; de Longueville, Florence

Poster (2015, December 10)

L’interface terre-mer est un environnement extrêmement fragile. De par le monde, les littoraux sont menacés par une multitude de facteurs parfois naturels et le plus souvent anthropiques. Ainsi, aux ... [more ▼]

L’interface terre-mer est un environnement extrêmement fragile. De par le monde, les littoraux sont menacés par une multitude de facteurs parfois naturels et le plus souvent anthropiques. Ainsi, aux perturbations occasionnées aux zones côtières par les infrastructures portuaires, les barrages, les prélèvements de sédiments à même la plage ou encore l’extension urbaine, s’ajoutent les conséquences des changements climatiques, dont l’élévation du niveau des océans. Nous proposons dans cet article d’évaluer la récente évolution du trait de côte au Togo et au Bénin où plusieurs études localisées démontrent que les plages sableuses connaissent des modifications (accumulation ou érosion) majeures ces dernières décennies. Dans le but d’avoir une vision globale de la dynamique côtière sur les 152 kilomètres de plages de ces deux pays d’Afrique de l’Ouest, nous utilisons les images à haute définition spatiale disponibles en open access sur Google Earth. Dans cette étude exploratoire, nous analysons le trait de côte par sections de 1 kilomètre entre 2002 et 2015 en estimant systématiquement l’évolution moyenne en mètre par an. Globalement, il appert que si certaines sections connaissent une accumulation, c’est uniquement dû au fait que celles-ci se trouvent en amont d’un obstacle majeur, comme la jetée d’un port. Les sections relativement stables sont uniquement liées à la présence de mesures de protection, comme des épis. Partout ailleurs, les littoraux subissent un processus érosif pouvant être impressionnant avec des reculs moyens pouvant dépasser les 10 mètres par an. [less ▲]

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See detailDesign of new delivery systems for therapeutic proteins based on calcium carbonate microspheres
Ramalapa, Bathabile ULg; Crasson, Oscar ULg; Vandevenne, Marylène ULg et al

Poster (2015, December 10)

There exists a constant need for delivery systems that are biocompatible, offer bioactives protection from premature degradation and allow for targeted delivery and controlled release. Calcium carbonate ... [more ▼]

There exists a constant need for delivery systems that are biocompatible, offer bioactives protection from premature degradation and allow for targeted delivery and controlled release. Calcium carbonate (CaCO3) is one such system that has gained great favour for employment in the biomedical field due to possibilities of controlling size, morphology and crystalline forms of particles by tuning the synthesis conditions. CaCO3 has demonstrated ability to increase safety, stability and overall efficiency of protein therapeutics. The aim of the present work was to assess the significance of polysaccharide-protein complexes in enhancing the encapsulation of proteins in CaCO3 microspheres. A Chitin Binding Domain (ChBD), reported to have affinity for hyaluronic acid, was inserted on β-lactamase enzyme to develop a chimeric protein. The chimeric protein retained the activity of the enzyme and the binding properties and was encapsulated in CaCO3 microspheres by a super critical CO2 (ScCO2) process using hyaluronic acid as a templating agent. The particles were characterised in terms of size, zeta potential, morphology and protein loading. The results obtained confirmed the affinity of the ChBD to hyaluronic acid towards the production of stable, vaterite microparticles. Protein assays demonstrated that the ChBD enhanced the encapsulation of protein by up to 10 fold. Confocal images also suggested high encapsulation of the chimeric protein compared to native protein. Thus the production of polysaccharide-protein complexes seems effective in enhancing the encapsulation of proteins in CaCO3 microparticles using the ScCO2 process. Moreover this method will further be used to enhance encapsulation of therapeutic proteins such as growth factors for bone and cartilage regeneration. [less ▲]

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See detailAnalytical developments to assess the crashworthiness of an offshore wind turbine jacket impacted by a ship
Pire, Timothée ULg; Le Sourne, Hervé; Buldgen, Loïc ULg et al

Poster (2015, December 10)

As the number of offshore wind farms is constantly increasing, impacts between ships and wind turbines is becoming a major concern. Nowadays, design offices use finite elements simulations to assess the ... [more ▼]

As the number of offshore wind farms is constantly increasing, impacts between ships and wind turbines is becoming a major concern. Nowadays, design offices use finite elements simulations to assess the crashworthiness of offshore supporting structures, which give accurate results but is time demanding. There is therefore a need for a faster method, especially during the pre-design stage. The purpose of this research is to develop analytical formulations, based on the so-called continuous elements method in order to compute the resistance of offshore wind turbine jackets when submitted to an impact. [less ▲]

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See detailNitrous oxide fluxes by croplands: Towards a better understanding of emission mechanisms and dynamics
Lognoul, Margaux ULg; Broux, François ULg; SALERNO, Giovanni ULg

Poster (2015, December 10)

Nitrous oxide is a greenhouse gas that can be emitted by crops. Our poster summarizes the emission mechanisms and implied variables and presents preliminary results obtained with eddy covariance on winter ... [more ▼]

Nitrous oxide is a greenhouse gas that can be emitted by crops. Our poster summarizes the emission mechanisms and implied variables and presents preliminary results obtained with eddy covariance on winter wheat and automated dynamic closed chambers on maize. [less ▲]

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See detailThe ICOS Vielsalm Terrestrial Observatory: long term greehouse gas flux measurements
Hurdebise, Quentin ULg; De Ligne, Anne ULg

Poster (2015, December 10)

Presentation of the Vielsalm ICOS Terrestrial Observatory: site management, data available, data access, flux temporal dynamic and flux relation with climate variables.

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Peer Reviewed
See detailImpact of shoreline changes on population in Cotonou, Benin
de Longueville, Florence; Hountondji, Yvon Carmen; Gemenne, François ULg et al

Poster (2015, December 10)

The coast of Cotonou (Benin) is affected by an intensive coastal erosion for several decades, mainly due to unsuitable port infrastructures and human activities. In the future, the process will very ... [more ▼]

The coast of Cotonou (Benin) is affected by an intensive coastal erosion for several decades, mainly due to unsuitable port infrastructures and human activities. In the future, the process will very likely be worsen by sea level rise as a consequence of global warming. In this study, we use a combination of very high resolution satellite images from Google Earth recorded in 2002, 2011, 2013 and 2014 and carry out field missions in September 2012, September 2013, July 2014 and February 2015 to assess the retreat of the coastline and to understand the dynamic of population in the risk area. Multi-temporal analyses of satellite images show that nearly 93 hectares of land (including 40 hectares off) were progressively eroded by the sea between 2002 and 2014 on the stretch of the first eight kilometers at the east of the Safiato groyne. This corresponds to an average coastline’s retreat of 115 meters in 13 years, with variations from 38 to 145 meters, depending on the location. Thanks to the comparison between the images of 2002 and 2014, we assess that around 765 houses disappeared by the encroachment of the sea over the distance of 8 km to the East of the Safiato groyne, of which 60 villas and about 705 makeshift houses (informal settlements). Well-off population leave the risk area when their houses are threatened and go inland, fishermen prefer to stay in the risk area to be close to their activities and precarious population have no financial and social capitals to migrate, they are trapped in the risk area. Other precarious population coming from somewhere else settle in the coastal area and grow the at-risk population. The use of intermediate images and the results of field works confirm a rapid process of settlement/destruction of makeshift houses in the coastal area. Poor people carry out simply short displacements in the risk area. There is an urgent need to secure these populations. Update and respect of urban planning regulations, good governance, cooperation with other countries and involvement of local communities are all factors that are expected to reach this objective. [less ▲]

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See detailCarte des risques de la baie de Tipaza (Algérie)
Nouri, Myriem ULg; Ozer, André ULg

Poster (2015, December 10)

Le littoral algérien a toujours été un territoire propice à l’établissement humain. En l’espace de 45 années, il a subi une urbanisation intense qui a développé une vulnérabilité multiple face aux ... [more ▼]

Le littoral algérien a toujours été un territoire propice à l’établissement humain. En l’espace de 45 années, il a subi une urbanisation intense qui a développé une vulnérabilité multiple face aux phénomènes naturels extrêmes. La zone d’étude, appelée dans ce travail « Baie de Tipaza », est l’un des espaces littoraux les plus évolutifs de l’aire métropolitaine d’Alger. Cette évolution lui a valu le titre de zone à très haute vulnérabilité dans l’espace algérien en termes de catastrophes naturelles. L’étude effectuée est une étude rétrospective, multiple et de constat. Son objectif est de présenter une carte des risques côtiers majeurs dans la zone-type. Les critères de jugement se basent sur des faits enregistrés et datés avec une étude géolocalisée grâce à des outils de télédétection et de système d’information géographique (SIG). Nous avons identifié trois (03) risques majeurs exerçant leur impact sur le territoire en étude : le risque sismique, les inondations et l’érosion du littoral. L’aléa sismique reste le plus dommageable car notre zone d’étude appartient au grand système actif de failles délimitant les plaques africaine et eurasiatique. Les séismes au large peuvent aussi causer des tsunamis. En ce qui concerne les inondations, l’irrégularité des pluies et leur soudaineté engendrent un caractère torrentiel au réseau hydrologique par des inondations de type « flash flood ». Quant à l’évolution littorale, la côte de Tipaza est globalement en recul permanent avec des variations entre -1.00 et - 2.70 m/an. Ces trois phénomènes exercent leur action sur un terrain de plus en plus urbanisé à très forte densité où 1.8% de la population algérienne est établie, avec un taux d’accroissement entre 1998 et 2008 de 2.1%. Cette pression démographique très importante se matérialise à travers des extensions urbaines non contrôlées et une évolution dirigée vers le littoral. La comparaison entre les images CORONA de 1967 et WORLDVIEW de 2010 montre une densification intense et continue de cette partie du littoral. Les résultats cités en amont, nous montrent l’ampleur de la vulnérabilité de la baie. Le risque sismique est permanent, il exerce un impact direct sur les constructions et induit des dégâts matériels et sociaux immédiats d’où la classification du site en « Zone III ». Les inondations se sont souvent produites suite à des événements ordinaires et saisonniers n’ayant rien de remarquables, mais accentuées essentiellement par l’urbanisation anarchique qui favorise une perméabilisation non contrôlée des sols, par la défaillance des réseaux d’assainissement et le gonflement des oueds dû à l’accumulation de décombres et de détritus surtout à leurs embouchures. Quant à l’érosion de la bande littorale, elle est causée par l’interruption du transit sédimentaire causée à l’amont par la présence de barrages qui bloquent les alluvions et par une surexploitation locale des sédiments de plages pour l’industrie du bâtiment. En outre, une urbanisation trop proche de la côte perturbe l’équilibre fragile du littoral. Ce travail limité à la baie de Tipaza a pour but de cartographier les données disponibles, il fait partie d’une étude de vulnérabilité de la zone urbanisée ou à urbanisation future de la bande côtière algérienne. Cette carte des risques permettra d’émettre des recommandations et des plans de gestion et sera un outil d’aide à la décision. [less ▲]

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See detailLa traduction de l’humour dans la poésie orale peule du Cameroun
Oumarou Mal Mazou, Rachid ULg

Poster (2015, December 09)

Le poster présente le projet de thèse en cours de finalisation à l'Université de Liège

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See detailOn the LZ distance for dereplicating redundant prokaryotic genomes
Léonard, Raphaël ULg; Baurain, Denis ULg; Kerff, Frédéric ULg et al

Poster (2015, December 07)

The fast-growing number of available prokaryotic genomes, along with their uneven taxonomic distribution, is a prob- lem when trying to assemble broadly sampled genome sets for phylogenomics and ... [more ▼]

The fast-growing number of available prokaryotic genomes, along with their uneven taxonomic distribution, is a prob- lem when trying to assemble broadly sampled genome sets for phylogenomics and comparative genomics. Indeed, most of the new genomes belong to the same subset of hyper-sampled phyla, such as Proteobacteria and Firmicutes, or even to single species, such as Escherichia coli (almost 2000 genomes as of Sept 2015), while the continuous flow of newly discovered phyla prompts for regular updates. This situation makes it difficult to maintain sets of representative genomes combining lesser known phyla, for which only few species are available, and sound subsets of highly abundant phyla. An automated straightforward method is required but none are publicly available. The LZ distance, in conjunction with the quality of the annotations, can be used to create an automated approach for selecting a subset of represen- tative genomes without redundancy. We are planning to release this tool on a website that will be made publicly available. [less ▲]

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See detailVariability in almond oil chemical traits from traditional cultivars from eastern Morocco
Houmy, Nadia; Belhaj, K.; Abid, M. et al

Poster (2015, December 03)

In Morocco, cultivation of almond tree (Prunus amygdalus L.) constitutes the second most important plantation of fruit trees after olive growing. It is mostly cultivated in two regions, « Taza, Al ... [more ▼]

In Morocco, cultivation of almond tree (Prunus amygdalus L.) constitutes the second most important plantation of fruit trees after olive growing. It is mostly cultivated in two regions, « Taza, Al Houceima Taounate » in the north and « Souss Massa Draa » in the south. Almond genetic resources (Marcoma, Fournat, Ferragnes/Ferraduel and Beldi), cultivated in eastern Morocco were studied during two consecutive crop years in order to evaluate variations in kernel oil yield, fatty acid profiles, oleic /linoleic (O/L) ratio and almond oils oxydative stability (OSI,evaluated by rancimat tests) in comparison to monovarietal olive oils. Almond kernel total oil (AO), Oleic acid (C18:1), Linoleic acid (C18:2), O/L-ratio, and tocopherol contents range between: 48 - 62% for kernel total oil; 65- 77.5% for C18:1; 17- 25% for C18:2; 2.5-4 for O/L ratio and 370 - 675 μg/g oil for tocopherols, respectively. We conclude that the genotype is the main variability source for all these chemical traits of AOs. Results obtained from Ferragnes/Ferraduel may be of interest for almond breeding focused to improve kernel oil yield and fatty acid profile. Besides, tocopherols contents of AOs seem to be the most important contributor for their stability to oxidation, even though compared to monovarietal olive oils, stability of AOs were very low and OSI value range between 20-27 hours. This fragility of AOs is due to their high content of unsaturated fatty acid which not allows their use for cooking or storage for long period. However, almond oils could have many applications in the food industry as in cosmetic [less ▲]

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See detailHuman Adult Bone Marrow and Adipose Tissue Harbor Stem Cells with Neural Crest Characteristics.
Coste, Cécile ULg; Neirinckx, Virginie; Rogister, Bernard ULg et al

Poster (2015, December 03)

Detailed reference viewed: 35 (2 ULg)
See detailCompensatory Metabolism Promotes Cancer Cell Adaptation to HDAC5 Silencing
Hendrick, Elodie ULg; Peixoto, Paul; Polese, Catherine et al

Poster (2015, December 03)

Detailed reference viewed: 45 (13 ULg)
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See detailAFM study of the penicillin receptor BlaR1 of Bacillus licheniformis
Mescola, Andrea ULg; Dauvin, Marjorie ULg

Poster (2015, December 03)

In presence of β-lactamines, some strains of B. licheniformis secret a β-lactamase that hydrolyses the antibiotic, making the bacteria resistant to penicillin. Staphylococcus aureus possesses a very ... [more ▼]

In presence of β-lactamines, some strains of B. licheniformis secret a β-lactamase that hydrolyses the antibiotic, making the bacteria resistant to penicillin. Staphylococcus aureus possesses a very similar system, allowing the expression of a β-lactamase in response to the presence of antibiotic outside the cell . In both strains, cells are able to sense the antibiotic in the medium through a membrane penicillin receptor BlaR1. Up to now, the 3D structure addressing the receptor in its entire form is not available, mainly due to low production yields and degradation. Here we show production, purification and reconstitution of the entire membrane protein in a lipid bilayer and a first AFM study of intra-molecular forces involved in the activation process of BlaR1. [less ▲]

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See detailFunctional characterization of FRD3,  a citrate transporter, in Arabidopsis relatives
Scheepers, Maxime ULg; Charlier, Jean-Benoit; Spielmann, Julien ULg et al

Poster (2015, December 03)

Transcriptomic studies identified genes which are constitutively over-expressed in A. halleri compared to A. thaliana and which may have a role in metal tolerance or accumulation (1-3). A candidate gene ... [more ▼]

Transcriptomic studies identified genes which are constitutively over-expressed in A. halleri compared to A. thaliana and which may have a role in metal tolerance or accumulation (1-3). A candidate gene encodes FRD3, a member of the MATE family of membrane transporters (56 members in A. thaliana). It is a citrate transporter involved in iron homeostasis (4-6) and playing a role in zinc tolerance in A. thaliana (7). We are aiming to analyse the FRD3 high expression in A. halleri and the FRD3 function in zinc and iron homeostasis in A. thaliana. [less ▲]

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See detailNo favorable effect of reduced tillage on microbial communities in a silty loam soil (Belgium)
Degrune, Florine ULg; Theodorakopoulos, Nicolas ULg; Dufrêne, Marc ULg et al

Poster (2015, December 01)

To date, only a few studies have applied metagenomics to investigate the influence of different tillage regimes and types of crop residue management on soil microbial communities. These studies were ... [more ▼]

To date, only a few studies have applied metagenomics to investigate the influence of different tillage regimes and types of crop residue management on soil microbial communities. These studies were conducted under specific climates on soils characterized by particular land-use histories. A very different ecological context is to be found in certain areas of Western Europe, such as central Belgium, whose loess-derived soils are among the most fertile in the world and have long been used for intensive agriculture. Specific objectives were to determine diversity levels and changes in microbial community composition under different combinations of tillage regime (conventional vs. reduced) and crop residue fate (residue removal R- vs. residues left R+ on the field). As reduced tillage results in two contrasting zones (the first centimeters of soil are mixed each year, while the soil below remains unperturbed), we chose to perform the analysis at two depths: 0 to 5 cm and 15 to 20 cm. [less ▲]

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See detailProtein structure modeling using backbone chemical shifts
Wanko Nembot, Alexis Marius ULg; Damblon, Christian ULg

Poster (2015, December 01)

The knowledge of the tridimensional structure of a protein is essential to study its interactions and understand its mode of action. The Purpose of our work is to quickly and easily determine the ... [more ▼]

The knowledge of the tridimensional structure of a protein is essential to study its interactions and understand its mode of action. The Purpose of our work is to quickly and easily determine the structure of proteins using the backbone chemical shifts. Backbone chemical shifts data are NMR parameters that can be rapidly, easily and accurately measured. This parameter is very sensitive to the conformation of amino acids and is used to deduct the secondary structure (TALOS, RCI,...). We therefore plan to use backbone chemical shifts as constraints on dihedral angles to quickly and easily determine protein structure. Several « de novo » methods like CS-Rosetta , CS23D et CHESHIRE have been recently developed in this purpose. We will use proteins of different sizes for which, the structure (X-ray or NMR structure) and chemical shifts backbone are available for testing the three softwares. Knowing that each of these softwares predicted a large number of low energy models on the one hand, and that the deployment and use of these tools constitutes obstacles for users who are not experts in computer science on the other hand, our goal will be to develop a platform that can easily compare these three methods based on quality of the structure produced. [less ▲]

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See detailRetrieval of Mars' Upper Atmospheric Composition using Dayglow Observations by IUVS on MAVEN
Evans; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

Detailed reference viewed: 16 (0 ULg)
See detailMars Ozone Mapping with MAVEN IUVS
Lefèvre; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

Detailed reference viewed: 12 (0 ULg)
See detailMAVEN/IUVS Apoapse Observations of the Martian FUV Dayglow
Correira; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

Detailed reference viewed: 10 (0 ULg)
See detailEFHC1/Myoclonin-1 modulates the post-translational modification of microtubules
Medard, Laurie ULg; Godin, Juliette; Coumans, Bernard ULg et al

Poster (2015, December)

Rationale: Juvenile myoclonic epilepsies (JME) are one of the most common forms of genetic generalized epilepsy. Genetic studies have shown that heterozygous mutations in EFHC1/Myoclonin1 are responsible ... [more ▼]

Rationale: Juvenile myoclonic epilepsies (JME) are one of the most common forms of genetic generalized epilepsy. Genetic studies have shown that heterozygous mutations in EFHC1/Myoclonin1 are responsible for 3-22% of JME cases worldwide. The Myoclonin1 protein contains three DM10 domains of unknown function and an EF-hand domain. We have previously demonstrated that Myoclonin1 is a microtubule-associated protein involved in cell division and radial migration during neocortex development. In cells, this protein co-localized with specific structures rich in microtubules (MTs) such as the centrosome, the poles of the mitotic spindle or the motile cilia but not with cytoplasmic MTs. This suggests post-translational modifications (PTM) of MTs may be important for the interaction between Myoclonin1 and MTs Methods: We co-expressed the different enzymes catalyzing PTM of MTs with Myoclonin1 in U2OS cell line, and then performed immunocytochemistry and western blot analysis. We next performed pulldown and luciferase complementation assays to test protein interaction Results: With one of these enzymes, we observed a strong increase in PTM in the presence of Myoclonin- 1.Interestingly, the effect is observed even when a DM10 domain alone is co-expressed with the enzyme, suggesting for the first time a role for this domain. This suggests that Myoclonin1 may interact with and modulate the activity of this enzyme. By using luciferase complementation assay and pull down experiments, we could demonstrate that both proteins interact. Conclusions: Our data suggest Myoclonin-1 modulates specific PTM of MTs. This is of prime importance for microtubule dynamic and notably for neuroblast precursor migration during neocortex development. This could be the mechanism that explains why pathological forms of myoclonin-1 may affect brain development. [less ▲]

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See detailTides in the Martian Atmosphere as Observed by MAVEN IUVS
Lo; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

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See detailSpatial variations in the concentrations of mercury and persistent organic pollutants in free-ranging bottlenose dolphins from South Florida
Das, Krishna ULg; Damseaux, France ULg; Heithaus, M.R. et al

Poster (2015, December)

The bottlenose dolphin (Tursiops truncatus) is an abundant top predator found in nearshore waters of South Florida including heavily developed and remote coastal waters. The objective of this study was to ... [more ▼]

The bottlenose dolphin (Tursiops truncatus) is an abundant top predator found in nearshore waters of South Florida including heavily developed and remote coastal waters. The objective of this study was to quantify total mercury (T-Hg) and persistent organic pollutant (POPs: NDL-PCBs, PBDEs, DDT, HCH, HCB, PCDD/Fs and DL-PCBs) levels in bottlenose dolphins found off the highly populated island of Key West (n = 27) and from the undeveloped Florida Coastal Everglades (FCE; n = 20). T-Hg and POPs were analyzed in skin and blubber tissues, respectively, using a Direct Mercury analyzer (for T-Hg), GC-ECD (POPs) and GC-HRMS (DLCs). The 7 ICES PCBs were the main compounds found in bottlenose dolphins from Key West (8229 ng.g-1 lipids) and the FCE (2289 ng.g-1 lipids), while the concentrations of PCDD/Fs remained low (Key West: 104 pg.g-1 lipids, FCE: 102 pg.g-1 lipids). POP concentrations were higher in individuals from Key West compared to those from the FCE. However, POP concentrations in Key West dolphins were lower than those from other locations in Florida and around the world. Unlike organic pollutants, T-Hg concentrations were significantly higher in FCE dolphins (Key West: 2941 ng.g-1 dw versus, FCE: 9314 ng.g-1 dw), with the highest concentrations reported from the southeastern US. PCB concentrations remained under previously suggested threshold for adverse health effects (including immunosuppression) in marine mammals of 17 000 ng/kg lipid. To conclude, sources of T-Hg and POPs differed between Key West and the FCE as reflected by their concentrations in skin and blubber of free-ranging bottlenose dolphins highlighting their role as sentinels of their environment. [less ▲]

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See detailProbing the Martian Atmosphere with MAVEN/IUVS Stellar Occultations
Gröller; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

Detailed reference viewed: 11 (0 ULg)
See detailStudy of the Martian cold oxygen corona from the O I 130.4 nm by IUVS/MAVEN
Chaufray; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

Detailed reference viewed: 16 (0 ULg)
See detailThe Two Types of Aurora on Mars as Observed by MAVEN's Imaging UltraViolet Spectrograph
Schneider; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

Detailed reference viewed: 26 (2 ULg)
See detailThe Hot Oxygen Corona of Mars: Observations by MAVEN IUVS
Deighan; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

Detailed reference viewed: 17 (2 ULg)
See detailCarbon substrate utilization and microbial biomass in European forest soils are related to tree species diversity
Carnol, Monique ULg; Baeten, Lander; Bosman, Bernard ULg et al

Poster (2015, December)

Tree species influence biogeochemical cycling through element deposition (throughfall, litterfall), root decomposition and exudates, and through their influence on the microbial activities in the soil ... [more ▼]

Tree species influence biogeochemical cycling through element deposition (throughfall, litterfall), root decomposition and exudates, and through their influence on the microbial activities in the soil. Yet, the effect of mixing tree species on soil functioning is unclear, in particular concerning the microbial diversity and activity in soils. Here we synthesize results from the Exploratory Platform of the FunDivEUROPE project (http://www.fundiveurope.eu/). This network of 209 comparative plots covering tree diversity levels of 1 to 5 species was established in existing mature forests in 6 European regions. These six focal regions represent a gradient of major European forest types from boreal to Mediterranean forests. The aims of this study were to determine the soil microbial biomass and metabolic diversity of soil bacteria for these 6 European forest regions, presenting each a tree species richness gradient and to analyse the impact of tree species richness and the role of other controlling factors. We analysed the relation between tree species diversity, the proportion of coniferous tree species and soil factors (pH, soil organic carbon, water soluble carbon and nitrogen) and the carbon substrate utilisation pattern of soil bacteria (BIOLOG Ecoplate), soil microbial biomass (fumigation-extraction), hot water carbon and nitrogen in the forest floor and the upper mineral soil horizon (linear mixed models, GLM for multivariate abundance data, discriminant correspondence analysis). Mean values of microbial biomass carbon ranged from 3264 (Italy) to 8717 (Finland) mg kg-1 in the forest floor and from 465 (Italy) to 3748 (Finland) mg kg-1 in the mineral soil. Statistical models predicted microbial biomass to increase in both soil layers by 7-8% with each step increase in tree diversity. Increased proportion of conifers was linked to a decrease in the number of carbon substrates used by soil bacteria. The types of carbon sources used were dependent on region, proportion of conifers, soil pH and water-soluble carbon and nitrogen. [less ▲]

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See detailForward Stagewise Additive Modeling for Computer Aided Diagnosis (CAD) Systems
Wehenkel, Marie ULg

Poster (2015, November 26)

Detailed reference viewed: 24 (6 ULg)
See detailCardio-pulmonary mechanics and minimal modelling in critical care
de Bournonville, Sébastien; Pironet, Antoine ULg; Desaive, Thomas ULg et al

Poster (2015, November 26)

Detailed reference viewed: 17 (0 ULg)