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See detailBiostratigraphy of the JLMD-EW8 borehole and palaeogeographic interpretation
Steemans, Philippe ULg; Breuer, P.; Al-Hajri, S. et al

Conference (2016, December 21)

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See detailCaractérisation des anomalies fluorées des eaux souterraines du socle Précambrien du Bénin central (Afrique de l’Ouest). Apport des outils hydrogéochimiques, pétrographiques et minéralogiques
Tossou, Yao ULg

Doctoral thesis (2016)

In Benin, groundwater is widely used for drinking-water supply for the populations. In the central part of the country (Département des Collines) characterized by hard Precambrian rocks, aquifers are ... [more ▼]

In Benin, groundwater is widely used for drinking-water supply for the populations. In the central part of the country (Département des Collines) characterized by hard Precambrian rocks, aquifers are unproductive and the water quality is affected by contamination. Groundwater quality problems concern particularly high fluoride concentration (up to 7 m/L) and nitrate concentration (up to 350 mg/L). Dental fluorosis is also endemic in the area. This work aims to explain the hydrogeochemical processes which govern mineralization of groundwater and the origin of high fluoride concentration. It will finally help for a better management and control of this environmental issue. The investigations were essentially based on two complementary approaches: hydrochemistry in one hand and in other hand, petrography, mineralogy and geochemistry study of the crystalline aquifer rock materials. Results show that the water mineralization is dominated by water-rock interaction, including the hydrolysis of silicate minerals. However, external inputs also greatly influence the concentration of certain chemichal elements such as nitrate and chloride. Fluoride concentrations seem to be mainly due to hydrolysis of ferromagnesian minerals like biotite. Ion exchanges (〖OH〗^-/F^-) between groundwater and the rock matrix also contribute to increase fluoride concentrations in groundwater. Geochemical investigations show that in the crystalline rocks constitutive minerals, fluorine concentrations are in the range of 60 - 2900 ppm with an average of 1170 ppm. Similar values were obtained in similar worldwide geological formations characterized by high concentrations of fluoride in groundwater. Several fluorine bearing minerals have been identified, such as fluorite, biotite, muscovite, apatite, amphibole, sphene, allanite were identified the basement rocks. Despite the fact that fluorite and apatite are the fluorine most concentrating minerals, biotite seems to be the most contributing mineral to fluorine content of the crystalline rocks. Furthermore, groundwater samples with high fluoride concentration are located in area which basement rocks have important F concentration and higher alterability index. From a geostatistical modeling of the collected data, decision support tools are proposed. Those tools are maps of spatial estimation of fluoride concentrations and probabilities to exceed the guideline value in the groundwater in Collines Department. [less ▲]

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See detailHériter d'un suicide. Sur les grands paysages de Jean-Jacques Andrien.
Hamers, Jérémy ULg

Scientific conference (2016, December 21)

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See detailMiscelanea Palaeontologica 2016
Steemans, Philippe ULg; Gerrienne, Philippe ULg

Book published by Université de Liège (2016)

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See detailLe retour du Loup (Canis lupus) en Belgique : quel(s) rôle(s) pour le secteur associatif?
Geboes, Anne-Laure ULg; Kohler, Anthony

Conference (2016, December 21)

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See detailNew data on the incertae sedis biota and foraminifera of the mid-Famennian Baelen Member (Late Devonian, eastern Belgium)
Vachard, Daniel; Dreesen, Roland; Mottequin, Bernard et al

in Paleobiodiversity and Paleoenvironments (2016), 21

The Baelen mud mounds in eastern Belgium represent a local member of the mid-Famennian Souverain-Pré Formation (an important carbonate interval within the Condroz Sandstone Group). The lower part of this ... [more ▼]

The Baelen mud mounds in eastern Belgium represent a local member of the mid-Famennian Souverain-Pré Formation (an important carbonate interval within the Condroz Sandstone Group). The lower part of this member contains silty bioclastic wackestones and packstones that are particularly rich in the problematical algae Serrisinella and Dreesenullella. Plurilocular foraminifera (Septabrunsiina and Baelenia) and rare solitary rugose corals (Neaxon? sp.) occur within crinoidal grainstones (tempestites) interfingering with the latter bioclastic wacke-/packstones and red-stained stromatactoid spiculitic mudstones (carbonate mound core facies). Although Serrisinella is quite common in other mid- and late Famennian limestones, of Belgium, Dreesenulella is almost endemic of the Baelen Member. Both genera apparently inhabited the muddy sediment-water interface, constituting meadows probably in zones of intermittently strong bottom currents. The taxonomic similarities between Dreesenulella and Saccamminopsis are discussed, as well as their possible affinities with the Xenophophyrea and Kokomiacea. Moreover, the first stages of the Septabrunsiina–Baelenia foraminiferal lineage are analysed in detail. The taxonomic and palaoecological positioning of Serrissinella and Dreesenulella adds to the discussion about the palaeobathymetry of the Baelen mud mounds and corroborates sedimentological evidence for their relatively shallow carbonate ramp depositional setting. [less ▲]

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See detailTaste on/Taste off. Mettre sa sensibilité entre parenthèses
Vangeebergen, Thomas ULg

Scientific conference (2016, December 20)

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See detailLe défi wallon du FDF
Counet, Maxime ULg; Matagne, Geoffroy ULg; Verjans, Pierre ULg

Learning material (2016)

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See detailInsights on Molecular Mechanisms of Chondrocytes Death in Osteoarthritis
CHARLIER, Edith ULg; RELIC, Biserka ULg; Deroyer, Céline ULg et al

in International Journal of Molecular Sciences (2016)

Abstract: Osteoarthritis (OA) is a joint pathology characterized by progressive cartilage degradation. Medical care is mainly based on alleviating pain symptoms. Compelling studies report the presence of ... [more ▼]

Abstract: Osteoarthritis (OA) is a joint pathology characterized by progressive cartilage degradation. Medical care is mainly based on alleviating pain symptoms. Compelling studies report the presence of empty lacunae and hypocellularity in cartilage with aging and OA progression, suggesting that chondrocyte cell death occurs and participates to OA development. However, the relative contribution of apoptosis per se in OA pathogenesis appears complex to evaluate. Indeed, depending on technical approaches, OA stages, cartilage layers, animal models, as well as in vivo or in vitro experiments, the percentage of apoptosis and cell death types can vary. Apoptosis, chondroptosis, necrosis, and autophagic cell death are described in this review. The question of cell death causality in OA progression is also addressed, as well as the molecular pathways leading to cell death in response to the following inducers: Fas, Interleukin-1 (IL-1 ), Tumor Necrosis factor- (TNF- ), leptin, nitric oxide (NO) donors, and mechanical stresses. Furthermore, the protective role of autophagy in chondrocytes is highlighted, as well as its decline during OA progression, enhancing chondrocyte cell death; the transition being mainly controlled by HIF-1 /HIF-2 imbalance. Finally, we have considered whether interfering in chondrocyte apoptosis or promoting autophagy could constitute therapeutic strategies to impede OA progression. [less ▲]

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See detailMémoires déclinées. Représentations, actions, projections
Grandjean, Geoffrey ULg; Henrard, Gaëlle; Paulus, Julien

Book published by Territoires de la mémoire (2016)

L’objectif du présent ouvrage peut se résumer en une tentative de saisir les diverses manifestations de ce que Cornelius Castoriadis nommait le « ciment invisible tenant ensemble cet immense bric-à-brac ... [more ▼]

L’objectif du présent ouvrage peut se résumer en une tentative de saisir les diverses manifestations de ce que Cornelius Castoriadis nommait le « ciment invisible tenant ensemble cet immense bric-à-brac de réel, de rationnel et de symbolique qui constitue toute société » et que sont les mémoires collectives. Cette démarche s’effectue selon une déclinaison en trois registres. Les mémoires en tant que représentations, que celles-ci soient d’ordre médiatique, sociologique ou identitaire ; en d’autres termes, ce que les mémoires collectives, leur élaboration et leur usage peuvent dire de nous. Les mémoires en tant que moyens d’actions, allant de l’instrumentation politique et juridique à la commémoration et au travail pédagogique. Enfin, les mémoires en tant que projections, soit les différentes façons par lesquelles les mémoires collectives peuvent se retrouver projetées dans le débat public, le paysage urbanistique, les combats citoyens d’aujourd’hui et de demain. Représentations, actions, projections apparaissent de fait comme autant de vecteurs utiles à la mise en perspective du champ mémoriel. La volonté qui anime cet opus relève ainsi de l’exploration – non exhaustive – des diverses déclinaisons par lesquelles le passé, en tant que mémoire(s) collective(s), se déploie au sein du présent mais aussi par lesquelles le présent travaille le passé. Ou, pour paraphraser le philosophe Walter Benjamin, l’objet de ce livre pourrait peut-être se formuler comme une volonté d’observer les diverses constellations que le présent peut former avec le passé. [less ▲]

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See detailMémoires et contraintes déclinées. Classification des instruments mémoriels en Belgique et en France
Grandjean, Geoffrey ULg

in Grandjean, Geoffrey; Henrard, Gaëlle; Paulus, Julien (Eds.) Mémoires déclinées. Représentations, actions, projections (2016)

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See detailModel Sensitivity Studies of the Decrease in Atmospheric Carbon Tetrachloride
Chipperfield, M. P.; Liang, Q.; Rigby, M. et al

in Atmospheric Chemistry and Physics (2016), 16

Carbon tetrachloride is an ozone-depleting substance, which is controlled by the Montreal Protocol and for which the atmospheric abundance is decreasing. However, the current observed rate of this ... [more ▼]

Carbon tetrachloride is an ozone-depleting substance, which is controlled by the Montreal Protocol and for which the atmospheric abundance is decreasing. However, the current observed rate of this decrease is known to be slower than expected based on reported CCl4 emissions and its estimated overall atmospheric lifetime. Here we use a three-dimensional (3-D) chemical transport model to investigate the impact on its predicted decay of uncertainties in the rates at which CCl4 is removed from the atmosphere by photolysis, by ocean uptake and by degradation in soils. The largest sink is atmospheric photolysis (76% of total) but a reported 10% uncertainty in its combined photolysis cross-section and quantum yield has only a modest impact on the modelled rate of CCl4 decay. This is partly due to the limiting effect of the rate of transport of CCl4 from the main tropospheric reservoir to the stratosphere where photolytic loss occurs. The model suggests large interannual variability in the magnitude of this stratospheric photolysis sink caused by variations in transport. The impact of uncertainty in the minor soil sink (9% of total) is also relatively small. In contrast, the model shows that uncertainty in ocean loss (15% of total) has the largest impact on modelled CCl4 decay due to its sizeable contribution to CCl4 loss and large uncertainty range (157 to 313 years). With an assumed CCl4 emission rate of 39 Gg/yr, the reference simulation with best estimate of loss processes still underestimates the observed CCl4 (overestimates the decay) over the past two decades but to a smaller extent than previous studies. Changes to the rate of CCl4 loss processes, in line with known uncertainties, could bring the model into agreement with in situ surface and remote-sensing measurements, as could an increase in emissions to around 45 Gg/yr. Further progress in constraining the CCl4 budget is partly limited by systematic biases between observational datasets. For example, surface observations from the NOAA network are larger than from the AGAGE network but have shown a steeper decreasing trend over the past two decades. These differences imply a difference in emissions which is significant relative to uncertainties in the magnitudes of the CCl4 sinks. [less ▲]

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See detailSize and Value Matter But Not the Way You Thought
Lambert, Marie ULg; Fays, Boris ULg; Hübner, Georges ULg

Conference (2016, December 20)

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See detailUn grand juriste liégeois, Charles de Méan
Lagasse, Benoît ULg

Conference given outside the academic context (2016)

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See detailIntegrated microfluidic device for the synthesis of SERS substrates
Emonds-Alt, Gauthier ULg; Malherbe, Cédric ULg; Monbaliu, Jean-Christophe ULg et al

Poster (2016, December 19)

The goal of this work is to develop a quantitative analytical method for the glyphosate and its major metabolite the aminomethylphosphonic acid (AMPA) by coupling microfluidics with surface enhanced Raman ... [more ▼]

The goal of this work is to develop a quantitative analytical method for the glyphosate and its major metabolite the aminomethylphosphonic acid (AMPA) by coupling microfluidics with surface enhanced Raman spectroscopy (SERS). This work is divided into 4 axes : (a) bimetallic nanoparticles synthesis in a microreactor, (b) nanoparticles functionnalisation, (c) SERS quantification of glyphosate/AMPA and (d) miniature prototype development composed of axes a to c. The first section aims at the synthesis of bimetallic nanoparticles (Au-Ag, Au-Cu and Ag-Cu) in a microfluidic device. This microfluidic device integrates a first section for the synthesis of monometallic nanoparticles (core) and a second section for the reductive deposition of a second metal (shell). The second axe of this work deals with the functionnalisation of nanoparticles to improve the selectivity of this method for the selected analytes. Two types of functionnalisation are studied : PEGylation (a) with multi-arm PEG ending with -SH and/or (b) with linear heterobifunctionnal PEG. The third axe consists in measuring quantitatively glyphosate and AMPA in different matrices, such as water, urine and fruit juice. Finally, the forth axe deals with the development of a portable detection system to perform on-site analysis. This prototype integrates the microfluidic device for nanoparticles synthesis, their functionnalisation, an injection port followed by a mixing section for the sample and an integrated Raman spectrometer for in-line analysis. [less ▲]

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See detailMultiple roadmapping, scenario planning and technology assessment: The case of nanotechnologies
Van Oudheusden, Michiel ULg

Scientific conference (2016, December 19)

This presentation illustrates how roadmaps and scenarios are used, and can be used, in the diverse field of nanotechnologies. Its aim is to draw lessons from nanotechnologies to: 1. Ascertain how the ... [more ▼]

This presentation illustrates how roadmaps and scenarios are used, and can be used, in the diverse field of nanotechnologies. Its aim is to draw lessons from nanotechnologies to: 1. Ascertain how the social sciences and humanities (SSH) can contribute to developing research agendas, 2. Clarify which terms, approaches, and methods (e.g. Delphi) are mobilized in roadmap and scenario planning, 3. Provide concrete suggestions on how to develop scenario-driven roadmaps in equally complex and uncertain fields, such as radiation protection. [less ▲]

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