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See detailEvaluation of a new [18F] labeled tracer targeting synaptic vesicle protein 2C by ex vivo autoradiography and in vivo PET study in rat brain.
Warnock, Geoffrey; Aerts, Joël ULg; Mestdagh, Nathalie et al

Poster (2013)

Introduction The synaptic vesicle protein 2 (SV2) family is a group of integral membrane glycoproteins homologous to the major facilitator superfamily and could be involved in several neuronal diseasesa ... [more ▼]

Introduction The synaptic vesicle protein 2 (SV2) family is a group of integral membrane glycoproteins homologous to the major facilitator superfamily and could be involved in several neuronal diseasesa. The binding of the novel, no-carrier-added, [18F] labeled compound [18F]UCB-F to the SV2C isoform was evaluated in rat brain. Methods Radiochemistry No-carrier added [18F]UCB-F was obtained following the method shown in Fig. 1. The identity and purity of the tracer were evaluated by radioUPLC and chiral radioHPLC. Autoradiography Sprague Dawley rat brain sections were incubated at RT with buffered [18F]UCB-F solutions and exposed on film. Matching sections were stained with cresyl violet for structural identification. PET studies PET studies (Siemens Concorde Focus 120 µPET) were performed under isoflurane anesthesia. The tracer was injected as a bolus via the tail vein. After a 10-min transmission scan to correct for attenuation, dynamic emission data was recorded for a total of 60 min. The impact of P-glycoprotein (P-gp) activity on tracer uptake in the brain was evaluated using cyclosporine (50 mg/kg SC). Metabolite analysis During PET studies, arterial blood samples were taken for the measurement of tracer metabolites. Plasma was separated by centrifugation and proteins were acid-precipitated. Metabolites were detected using HPLC and confirmed by gamma counting. Results The tracer was obtained with a decay corrected yield of ±10%. Specific activity ranged from 10 GBq/µmol to 40 GBq/µmol. Ex vivo autoradiography showed that the binding of [18F]UCB-F to SV2C closely matched the expected distribution b (Fig.2). In vivo PET studies revealed that [18F]UCB-F briefly entered the brain, but exhibited extremely rapid washout. A large accumulation in the liver and intestines was observed. Metabolite analysis in the plasma revealed high protein binding and rapid metabolism. Inhibition of P-gp transport with cyclosporin had no clear effect on the rapid washout from the brain. Conclusions Despite a close match between [18F]UCB-F SV2C binding and the expected brain distribution, the pharmacokinetics in rat brain appear unfavorable for the use of this tracer to quantify SV2C in vivo. Acknowledgement / References a Lynch & al (2004) Proc. Natl. Acad. Sci. USA 101:9861 b Janz & Sudhof (1999) Neuroscience 94:1279 c The authors thank the Walloon Region and the FRNS Belgium for financial support. [less ▲]

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See detailMaternal transition of prenatal undernutrition in the laying hen
Willems, Els; Wang, Yufeng; Koppenol, Astrid et al

Poster (2013)

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See detailDINEOF-based bias correction of SEVIRI sea surface temperature using Metop-A/AVHRR and ENVISAT/AATSR SST
Tomazic, Igor ULg; Alvera Azcarate, Aïda ULg; Barth, Alexander ULg et al

Poster (2013)

Satellite-derived sea surface temperature (SST) show inter-sensor and inter-regional differences (biases) due to their technical characteristics, multispectral algorithm limitations and the changing ... [more ▼]

Satellite-derived sea surface temperature (SST) show inter-sensor and inter-regional differences (biases) due to their technical characteristics, multispectral algorithm limitations and the changing physical properties of the measured environments. The bias correction is usually calculated as a difference between the SST measurements from two sensors where one is defined as the reference (e.g. ENVISAT/AATSR). These empirical bias fields show gaps due to the satellite characteristics (e.g. narrow swath in case of AATSR) and to the presence of clouds or other atmospheric contamination sources. We present a bias correction approach based on DINEOF (Data Interpolating Empirical Orthogonal Functions) for reconstructing missing data. Two different approaches for deriving SST bias fields were used: analysing SST biases based on reconstructed SST differences or based on differences of the reconstructed SST fields. The method is applied at a large scale (European seas) and at a regional scale (e.g. Mediterranean Sea) to correct SEVIRI and Metop-A/AVHRR SST measurements using ENVISAT/AATSR as a corrector. For SEVIRI we additionally used Metop-A/AVHRR SST as a corrector to analyse the impact of ENVISAT/AATSR failure. Corrected SST fields based on both approaches were validated against independent in situ buoy SST data or with ENVISAT/AATSR SST data for areas without in situ data (e.g. eastern Mediterranean). The method is also compared to the operational bias correction method at Meteo-France/CMS that uses a temporal and spatial averaging. Results show that both approaches lead to near-zero biases when compared to AATSR SST measurements, although the differences of reconstructions exhibit much higher standard deviation (> 0.6 K) compared to the reconstruction of differences (< 0.5 K). Comparison with in situ data expectedly depends on the initial comparison between AATSR and in situ SST for specific regions. [less ▲]

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See detailNovel cooperation between CX3CL1 and CCL26 inducing NK cell chemotaxis via CX3CR1: a possible mechanism for NK cell infiltration of the allergic nasal tissue
EL SHAZLY, Amr ULg; Castillo-Doloriert, Hugo; Bisig, Bettina et al

Poster (2013)

Background: Recent data indicated that natural killer (NK) cells and chemokines could play a pivotal role in nasal inflammation. CX3CR1, the only receptor for fractalkine/ CX3CL1, is abundantly expressed ... [more ▼]

Background: Recent data indicated that natural killer (NK) cells and chemokines could play a pivotal role in nasal inflammation. CX3CR1, the only receptor for fractalkine/ CX3CL1, is abundantly expressed by NK cells, and was recently shown to also be a receptor for eotaxin-3/CCL26. However, no reports explored the NK cells-CX3CL1-CCL26 axis via CX3CR1 in allergy.
Objective: Our goals were first to determine specifically NK cell recruitment pattern in nasal tissue of allergic chronic rhinosinusitis (ACRS) and non-allergic chronic rhinosinusitis (NACRS) patients in comparison with healthy controls, and secondly, to investigate the function of CX3CR1 in NK cell migration. Methods: Immunohistochemistry, microchemotaxis chambers, flow cytometry and confocal microscopy were used in this study. Results: Herein, we showed that NK cells infiltrated the epithelial layers of nasal tissue only in ACRS patients and not in NACRS patients or controls. NK cells were also more numerous in the stroma of the nasal tissue from ACRS patients compared with NACRS patients or controls. This migration could be mediated by both CX3CL1 and CCL26, as these two chemokines induced NK cell migration. Moreover, both molecules also stimulated cytoskeleton changes and F-actin reorganisation in NK cells. Chemotaxis and cytoskeleton changes were sensitive to genistein, a tyrosine kinase inhibitor. By flow cytometry, we demonstrated that a single antigen nasal provocation challenge increased the expression of CX3CR1 on NK cells in allergic rhinitis (AR) patients. The function of this receptor was associated with a significant augmentation of NK cell chemotaxis against the optimal doses of CX3CL1 and CCL26. Conclusions and Clinical Relevance: Our results highlight a novel role for CX3CR1 in NK cell migration that may contribute to the NK cell trafficking to the allergic upper airway. This could be mediated largely by CX3CL1 and CCL26 stimulation of the tyrosine kinase pathway. [less ▲]

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See detailExpression of a protease of biotechnological interest cloned from C. d. collilineatus venom gland
Boldrini-Franca, Johaha; Rodrigues, RS; Santos-Silva, LK et al

Poster (2013)

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See detailRole of iron and siderophores in Steptomyces development
Lambert, Stéphany ULg

Poster (2013)

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See detailSelf-coverage of Leidenfrost droplets
Maquet, Laurent ULg; colinet, pierre; Moreau, Florian ULg et al

Poster (2013)

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See detailThe first Upper Paleolithic human remains from Belgium: Aurignacian, Gravettian and Magdalenian fossils at the “troisième caverne” of Goyet
Rougier, H.; Crevecoeur, I.; Beauval, C. et al

Poster (2013)

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See detailBrucella surveillance in stranded marine mammals from the North Sea
Alonso-Velasco, E.; Jauniaux, Thierry ULg; Michel, P. et al

Poster (2013)

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See detailEffects of diazoxide, benzothiadiazine and benzopyrane derivatives on mitochondrial proton and electron leaks of cardiomyocytes (H9C2 cell line).
Mouithys-Mickalad, Ange ULg; Ceusters, Justine ULg; Charef, M et al

Poster (2013)

Background: Mitochondria are double membrane- organelles that play a central role in cellular metabolism, calcium homeostasis and redox signaling. They have been also considered as main producers of ... [more ▼]

Background: Mitochondria are double membrane- organelles that play a central role in cellular metabolism, calcium homeostasis and redox signaling. They have been also considered as main producers of adenosine triphosphate (ATP) and reactive oxygen species (ROS). In many cancer cells those organelles become dysfunctional leading to a shift of energy metabolism from oxidative phosphorylation to active glycolysis and an increase of ROS generation. According to Warberg’ theory, cancer damage might occur at the mitochondrial level, affecting tiny structures within each cell implicated in the energy production through ATP. New insight is that mitochondria might be a good therapeutic target for metabolic syndromes, ischemia/reperfusion injury and organs transplantation. Therefore, search for novel molecules able to keep mitochondria functional are of relevant interest. Methodology: Cardiomyocytes (H9C2 cells) were from ATCC (USA) and grown till confluence. The basal cellular respiratory rate, proton and electron leaks as well as ATP production were measured with the High Resolution Oxygraphy (Oroboros, Austria). All compounds: diazoxide (DIAZ), diazoxide –related analogs (1: BPDZ-259, 2: BPDZ-444), and benzopyran derivatives (3: BPDZ-490, 4: BPDZ-711) were tested at final concentration of 10-5 M, except when specified and compared to control samples (cells with or without DMSO). Results and conclusion: The basal respiratory rate of H9C2 cells (5x106/mL) was changed depending on the chemical structure of the tested compounds: e.g. compound 3 strongly enhanced the routine respiration, while 4 displayed a marked lowering effect. In contrast, the addition of similar concentration of benzothiadiazin derivatives (1, 2) had no effect on routine respiration but also on the other respiratory parameters such as oligomycin-induced leak and ATP production. Similar profile was obtained with the reference molecule: diazoxide. Overall, our findings indicate that both diazoxide-like analogues (1 and 2) and diazoxide were without significant effect on basal respiration, ATP production, even on maximal respiration. Interestingly, two derivatives show opposite effects: compound 3 behaves as a uncoupling agent and the other one (4) exhibits a real lowering effect on respiration but that was reversible. The latter effect might be of interest if this kind of molecules could be used for further use as an agent for organ conservation during transplantation. Our results also demonstrate that diazoxide, a well-known Mito-KATP opener, did not exert its effect beside of clinical situation like ischemia/reperfusion injury. [less ▲]

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See detailNear-infrared spectroscopy for analysis of oil content and fatty acid profile in Jatropha curcas L. flour
Terren, Marieke ULg; Lecler, B.; Baeten, V. et al

Poster (2013)

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See detailEffect of humic substances on in vitro rooting of alder (Alnus glutinosa (L.) Gaertn) and birch (Betula pendula Roth)
Tahiri, Abdelghani ULg; Destain, Jacqueline ULg; Druart, Philippe et al

Poster (2013)

Humic substances (HS) are organic compounds resulting from the physical, chemical and microbiological transformations of organic residues. Present everywhere in the nature; they are taking part in basic ... [more ▼]

Humic substances (HS) are organic compounds resulting from the physical, chemical and microbiological transformations of organic residues. Present everywhere in the nature; they are taking part in basic functionalities in any ecosystems involving soils, sediments, water and landfills. They are heterogeneous and complex carbon macromolecules. Our study aims to compare the effect of HS from différent sources on in vitro rooting of woody plants. [less ▲]

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See detailCollection Efficiency and Design Requirements for Metallic Nanowire Networks in Solar Cells
Langley, Daniel ULg; Giusti, Gael; Nguyen, Ngoc Duy ULg et al

Poster (2013)

In using TCMs based on metallic nanowires it is important to determine the effect of nanowire geometry and spatial arrangement on the resulting network. To this end we have extensively simulated the ... [more ▼]

In using TCMs based on metallic nanowires it is important to determine the effect of nanowire geometry and spatial arrangement on the resulting network. To this end we have extensively simulated the effect of wire length and device size on the percolation properties of the network produced. We have performed Monte Carlo simulations of 2D conductive stick networks including for the first time stick lengths approximating nanowires which are produced experimentally. Each simulation is performed based on an average stick length but the actual lengths of the nanowires in the simulation are randomly generated with a normal distribution around the defined average length. The effects of density and length distribution on the percolation threshold are also explored. The results of such simulations are also employed to determine an elementary representative volume, which can be directly applied to a device design by allowing the determination of the nanowire density required to produce a conductive network associated with a characteristic length, such as diffusion length or pixel size. We also extend this work to the specific application of metallic nanowire networks as front electrodes in dye sensitized solar cells (DSSC), allowing a calculation of the collection efficiency as a function of network density. These calculations were based on the diffusion length of electrons generated within a DSSC and a spatial mapping of the collection efficiency function on the solar cell surface. [less ▲]

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See detailUnravelling the Roles of Elp3 in Ciliogenesis and Planar Polarity Establishment.
Huysseune, Sandra ULg; Boutin, Camille; Laguesse, Sophie ULg et al

Poster (2013)

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See detailImprovement of spray retention on barley leaves by adjuvants
Boukhalfa, Hassina dite Hafida ULg; Massinon, Mathieu ULg; Lebeau, Frédéric ULg

Poster (2013)

Adjuvants contribute to change the types of impact and thus the amount of spray retained by the leaves of the treated plant. We have performed tests of retention on barley plants on BBCH 12 stage and ... [more ▼]

Adjuvants contribute to change the types of impact and thus the amount of spray retained by the leaves of the treated plant. We have performed tests of retention on barley plants on BBCH 12 stage and small pieces of barley leaves at the same stage of growth. Spraying was done in three ways: water without adjuvant, water with Break-Thru® S240 and water with Li700®. The three slurries of fluorescein contained in an amount of 0.2 g / l. Fluorescein retained by the leaves in both cases is then measured by a spectrofluoremeter. The retention tests on whole plants show that it is tripled by the first adjuvant and doubled by the second. On the other side, on small pieces of barley leaves, the amount was increased by the use of surfactants but not to the same extend. This study concluded that the use of adjuvants in spray pesticides increases the amount of retention as a function of leaf area and the type of adjuvant. [less ▲]

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See detailBrucella surveillance in stranded marine mammals from the North Sea
Alonso-Velaco, E.; Jauniaux, Thierry ULg; Michel, P. et al

Poster (2013)

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See detailDevelopmental changes of thyroid hormones in sheepshead minnow, Cyprinodon variegatus
Schnitzler, Joseph ULg; Mariavelle, Emeline ULg; Silvestre, Frédéric et al

Poster (2013)

The sheepshead minnow is widely used in ecotoxicological studies and such investigations have begun to focus on potential disruption of the thyroid axis. However, normal levels of thyroxin (T4) and 3,5,3’ ... [more ▼]

The sheepshead minnow is widely used in ecotoxicological studies and such investigations have begun to focus on potential disruption of the thyroid axis. However, normal levels of thyroxin (T4) and 3,5,3’-triiodothyronine (T3) and their developmental patterns are unknown. This study set out to determine the profiles of whole-body thyroxin (T4) and 3,5,3'-triiodothyronine (T3) levels during the development of sheepshead minnow from embryo to juvenile and adults. Couples of three females and two males were placed in breeding chambers designed for this experiment. More than 1000 eggs were collected and maintained in seawater. Embryos were selected under a dissection microscope and placed in incubation dishes (50 per dish) at 25°C. On day 8, embryos hatched and larvae were transferred to 1L beakers. For one week after hatching, larvae were fed on artemias and from 8 to 30 days post-hatch they were fed on flaked fish food. Embryos were sampled on day 0, 2, 4, 6 post-fertilization and larvae and juveniles were sampled every three days from day 0 to 28 days post-hatch. The pooled samples were taken from several incubation dishes and divided in three replicate batches of 30 individuals. Enzyme-linked immunoassay were used and validated for analysis of T4 and T3 after extraction from whole fish. At each sampling point 5 individuals were placed in formalin fixative for histology. Length and body mass were measured. Hatching success, gross in vivo observations, thyroid hormone levels and histology data will be determined and discussed in the framework to characterize the profiles of thyroid hormone levels during the development of sheepshead minnow from embryo to adult. This study establishes a baseline for thyroid hormones in sheepshead minnows, which will be vital for the understanding of thyroid hormone functions and in future studies of thyroid toxicants in this species. [less ▲]

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See detailChronic exercise differentially impacts perceptual or motor inhibition as a function of age: a cross-sectional study
Albinet, Cédric; Boucard, Geoffrey; Collette, Fabienne ULg et al

Poster (2013)

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See detailPhotoferrotrophy and Fe-cycling in a freshwater column
Llirós, M; Crowe, SA; García-Armisen, T et al

Poster (2013)

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See detailCO2, CH4 and N2O dynamics and fluxes in the brackish Lake Grevelingen (The Netherlands)
Borges, Alberto ULg; Meysman, Filip; Harlay, Jérôme ULg

Poster (2013)

Lake Grevelingen in the South West Netherlands is a former estuary locked off from the sea by two dikes and a brackish lake since 1971 (salinities from 29 to 33 during our sampling). It is connected with ... [more ▼]

Lake Grevelingen in the South West Netherlands is a former estuary locked off from the sea by two dikes and a brackish lake since 1971 (salinities from 29 to 33 during our sampling). It is connected with the North Sea by sluices, has a surface area of 108 km2, a mean depth of 5.3 m, a maximum depth of 48 m, and about 60% of the area the depth is less than 5 m. In summer, anoxia occurs in bottom waters. From January 2012 to December 2012 a biogeochemical survey was conducted at monthly interval at a fixed station (35 m depth) at Den Osse. Here, we focus on the analysis of partial pressure of CO2, and concentrations of CH4 and N2O obtained throughout the water column. pCO2 followed a typical seasonal cycle for temperate coastal environments shifting from CO2 over-saturation in winter to spring CO2 under-saturation due to the spring phytoplankton bloom, and shifting back to over-saturation in fall. Unlike the adjacent Southern Bight of the North Sea and the adjacent Oosterschelde, CO2 under-saturation prevailed in summer in Lake Grevelingen. CH4 values were minimal in winter ( 20 nM) and as stratification developed during spring and summer a distinct maximum of CH4 (up to 730 nM) developed at the pycnocline (5 to 10 m). N2O showed little seasonal variations and only a very faint increase with depth, except in August when bottom waters became anoxic. At this time, N2O shown a maximum ( 22 nM) at the oxycline (probably related to enhanced N2O production by nitrification at low O2 concentrations), and decreased in the anoxic layer ( 3 nM) (probably related to denitrification). [less ▲]

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See detailSelf-coverage of Leidenfrost droplets
Maquet, Laurent ULg; colinet, pierre; Moreau, Florian ULg et al

Poster (2013)

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See detailDimensionnement et modélisation d'une micro-centrale solaire
Dumont, Olivier ULg

Poster (2013)

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See detailErdheim-Chester Disease : A Monocentric Series Of 96 Patients
Haroche, Julien; Arnaud, Laurent; Cohen-Aubart, Fleur et al

Poster (2013)

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See detailApprovisionnement alimentaire de la ville de Bukavu : flux en provenance de l'intérieur du Sud-Kivu, du Rwanda et du Nord-Kivu
Vwima Ngezirabona, Stany ULg; Lebailly, Philippe ULg

Poster (2013)

Ce travail caractérise les flux principaux d’approvisionnements alimentaires de la ville de Bukavu en provenance de l’intérieur de la province du Sud-Kivu, du Nord-Kivu et du Rwanda issus du pointage des ... [more ▼]

Ce travail caractérise les flux principaux d’approvisionnements alimentaires de la ville de Bukavu en provenance de l’intérieur de la province du Sud-Kivu, du Nord-Kivu et du Rwanda issus du pointage des flux des produits alimentaires. [less ▲]

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See detailPB15 polymorphic distinction in paint samples by combining micro- Raman spectroscopy and chemometrical analysis
Van Pevenage, Jolien; Defeyt, Catherine ULg; Moens, Luc et al

Poster (2013)

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See detailDifferentiation of Boettcher's cells during postnatal development of rat cochlea
Cloes, Marie ULg; Renson, Thomas; Johnen, Nicolas ULg et al

Poster (2013)

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See detailMicroRNA targeting of CoREST controls polarization of migrating cortical neurons.
Volvert, M. L.; Prevot, Pierre-Paul ULg; Pirotte, S. et al

Poster (2013)

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See detailMulti-Scale Modelisation of the Optical Second Harmonic Generation of Tyrosine-Containing Iturinic Antimicrobial Lipopeptides
Loison, Claire; Nasir, Mehmet Nail ULg; Benichou, Emmanuel et al

Poster (2013)

The optical Second Harmonic Generation (SHG) of Mycosubtilin Langmuir Layers at the air/water interface are modeled. In this tyrosine-containing lipopepeptide, the environment of the tyrosine residue is ... [more ▼]

The optical Second Harmonic Generation (SHG) of Mycosubtilin Langmuir Layers at the air/water interface are modeled. In this tyrosine-containing lipopepeptide, the environment of the tyrosine residue is critical in defining the SHG response. To propose reasonable the structure of Mycosubtilin aggregates at the air-water interface, molecular dynamics simulations (all-atom and coarse-grained) are performed. Molecular hyperpolarizability of the lipopeptide are obtained by Quantum Chemistry calculations. Finally, the SHG susceptibilities of the interface are calculated using a simple additive model. The molecular dynamics simulations suggest that lipopeptides aggregate at the interface into half-micelles, and that this phenomena is the origin of a constraint on Tyrosine orientation. In particular the C-OH bond of the Tyrosine residue has a preferential orientation along the interface normal, pointing towards the air. This inhomogneneous orientation distribution, associated with a dominant hyperpolarizability component along the C-OH bond of the Tyrosine, yields a characteristic SHG response. Comparison with experimental data gathered in our lab are proposed. [less ▲]

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See detailCustomizing an adaptive case management software in a GMP production lab as a quality management system for clinical trial PET radiopharmaceuticals development and production
Aerts, Joël ULg; Renard; Léonard, Marc ULg et al

Poster (2013)

The Cyclotron Research Centre (CRC) of the University of Liège develops and produces innovative radiopharmaceuticals for research and clinical diagnostic applications in humans. We report our recent ... [more ▼]

The Cyclotron Research Centre (CRC) of the University of Liège develops and produces innovative radiopharmaceuticals for research and clinical diagnostic applications in humans. We report our recent experience in the implementation of an adaptive case management software as a tool of tractability and quality management in our GMP1 facility. [less ▲]

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See detailEtude de modes de production de charbon de bois sur l'axe Lubumbashi-Kasenga
Nge Okwe, A.; Ngoy Shutcha, M.; Nkulu Mwine Fyama, J. et al

Poster (2013)

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See detailPIXE-PIGE analysis of early medieval window glass from the abbey of Stavelot
Van Wersch, Line ULg; Mathis, François ULg; Biron, Isabelle et al

Poster (2013)

From the 1 st century, glass found in northern Europe was made from a mix of sand and natron that had to be imported from eastern Mediterranean [1]. After the fall of the Roman Empire, glassmakers could ... [more ▼]

From the 1 st century, glass found in northern Europe was made from a mix of sand and natron that had to be imported from eastern Mediterranean [1]. After the fall of the Roman Empire, glassmakers could either recycle existing glass or continue to import material. Then, around the end of the 8 th century, the first testimonies of potash glass, made with sand and trees ashes, are attested [1]. This type of glass would then prevail but the reasons and mechanisms of its appearance remain beyond understanding. They could be linked to the development of architecture and the growing needs of window glass. Founded in the middle of the VII th century, the abbey of Stavelot was a first time ruined by Vikings in 881. In the destruction levels, hundreds fragments of window glass were found [2]. 34 fragments were analysed in PIXE-PIGE at the cyclotron of the Institute of Nuclear and Atomic Physics and of Spectrometry of the University of Liège. The results show coexistence of both natron and potash glass on the site, even in the same archaeological contexts. For the coloration, the recipes to obtain turquoise or amber glass were comparable to those known on other early medieval sites [3], but to make green potash glass the artisans have used to two types of recipes. This shows the need to carry on researches and analysis on early medieval window glass in order to understand its production techniques that are also at the origin of famous gothic stained glass [less ▲]

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See detailLe minerai de fer en Wallonie: une cartographie des gisements
Denayer, Julien ULg

Poster (2013)

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See detailDiagnosis of Pathogens responsible of pre-and post-harvest rice diseases in Madagascar
Razanakoto Mamiharisoa, Lea; De Clerck, Caroline ULg; Parisi, Olivier ULg et al

Poster (2013)

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See detailMobility of Cu and Co in soils from metalliferous ecosystems: results from a lysimeter study in Lubumbashi (Katanga)
Kaya Muyumba, Donato; Liénard, Amandine ULg; Pourret, Olivier et al

Poster (2013)

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See detailCharacterization of structures with a complex disposition of YBCO coated conductors for magnetic shielding applications
Wera, Laurent ULg; Fagnard, Jean-François ULg; Levin, G. A. et al

Poster (2013)

An efficient superconducting magnetic shield can be built as an assembly of YBCO 2G coated conductor sections. Each section is milled and placed around a cylindrical support in order to form a joint free ... [more ▼]

An efficient superconducting magnetic shield can be built as an assembly of YBCO 2G coated conductor sections. Each section is milled and placed around a cylindrical support in order to form a joint free superconducting loop where persistent currents can flow and provide a strong attenuation of a magnetic field. Our previous works have shown that this assembly is able to shield an axial quasi static (“DC”) magnetic field and that the shielding performances depend on the aspect ratio and the number of layers. The purpose of the present work is to study experimentally the shielding efficiency of several structures with a more complex orientation and position of YBCO coated conductors. Our aim is to design a magnetic shield that would be able to shield a magnetic field directed at any angle with respect to the superconducting loops. Such a structure can be obtained by placing pairs of coated conductors sections along three orthogonal axes. All experiments are carried out at 77K. The structure is subjected to a quasi-static (“DC”) magnetic field. A Hall probe measures the three components of the local magnetic induction inside the assembly as a function of the applied magnetic induction. The shielding efficiency of the structure is characterized as a function of (i) the magnetic field amplitude, (ii) the position of the Hall probe along the three axes, and (iii) the angles between the applied magnetic field and each axis. The experimental results allow us to determine the shielding efficiency in the central part of the new 3-axes structure. Although the shielding efficiency is lowered with respect to that of the traditional 1-axis-coil geometry, measurements at different field orientations allow us to identify the role played by each of the pairs of coils in screening the external magnetic field. [less ▲]

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See detailInduction of photosynthetic electron transfer upon anoxia in Chlamydomonas: role of hydrogenase activity and PSI-cyclic electron flow
Godaux, Damien ULg; Berne, Nicolas ULg; Remacle, Claire ULg et al

Poster (2013)

In Chlamydomonas reinhardtii, anoxic environment leads to the expression of various fermentative/anaerobic pathways. Among them, oxygen-sensitive hydrogenases catalyze the reduction of protons from ... [more ▼]

In Chlamydomonas reinhardtii, anoxic environment leads to the expression of various fermentative/anaerobic pathways. Among them, oxygen-sensitive hydrogenases catalyze the reduction of protons from reduced ferredoxin resulting in the production of molecular hydrogen. A possible role of chloroplast hydrogenase in the anaerobic induction of photosynthesis has been suggested forty years ago (Kessler, 1973) but never further explored. H2 evolution is a minor and transient phenomenon which is often considered as a safety mechanism to protect photosynthetic chain from overreduction (Melis and Happe, 2001; Hemschemeier et al., 2009). Recent data about hydrogen production in a pgrl1 (Proton Gradient Regulation like1) mutant with limited capacity for PSI-cyclic electron flow (CEF) also suggested a participation of CEF in photosynthesis reactivation after short dark-anoxic periods (Tolleter et al., 2011). Because H2 evolution is improved in pgrl1 mutant, authors came to the conclusion that H+ gradient generated by CEF strongly prevents electron supply to the hydrogenase and is thus a limitating factor for hydrogen production. The aim of our work is to further study the role of hydrogenase and CEF in the photosynthesis reactivation process after short (~1h) or long (>18h) dark-anoxic periods. We take advantage of the availability of hydrogenase-deficient mutants (hydEF, hydG) (Posewitz et al., 2005; Godaux et al., 2013) and above-mentioned CEF-deficient pgrl1 mutant. Light-induced photosynthetic electron transfer is studied by measuring hydrogen and oxygen evolution, as well as by following kinetics of chlorophyll fluorescence emission and P700 oxidoreduction. Firstly, we show that during the induction of photosynthesis after long dark-anoxic periods, there is a linear relationship between hydrogen evolution, PSI and PSII activities, meaning that an hydrogenase- dependent photosynthetic linear electron flow (LEF) mainly operates. Moreover, PSI and PSII photochemical yield are almost null in hydrogenase-deficient mutants. We conclude that hydrogenase is the main sink for photosynthetic electrons upon illumination after prolonged anoxia. Similarly, a linear correlation can be established between hydrogen evolution, hydrogenase expression/activity, and PSI or PSII photochemical yields upon adaptation to anoxia. In the next part of our work, we focus our attention on the role of PSI-CEF in the induction of photosynthesis upon anoxia. Combined measurements of PSI/PSII activities and O2/H2 evolution show that induction of photosynthesis is delayed in a Pgrl1-deficient strain. In absence of Pgrl1 protein, the H+ gradient is also lower and we thus propose that a lack of ATP is responsible for the delayed Calvin cycle reactivation, so that hydrogen production can be achieved for a longer time without inactivation of hydrogenase activity by evolved O2. These results are in good agreement with other results obtained by our group, demonstrating that state transition is a critical process for induction of photosynthesis in anoxia (Ghysels et al., accepted). In conclusion, a Pgrl1-dependent CEF seems to be in first importance to photosynthesis induction after one hour of dark-anaerobiosis adaptation, acting together with an hydrogenase dependant LEF to set favourable conditions for Calvin cycle activation. [less ▲]

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See detailPredictive Value of Squamo-Columnar Junction Markers and p16ink4 in Multi-Observer Classification of Cervical Precursor Lesions
Jimenez, C; Howitt, BE; Nucci, MR et al

Poster (2013)

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See detailEtude longitudinale des besoins psychosociaux des conjoints de personnes atteintes d'un cancer : hiérarchisation et résolution de problème
Wagener, Aurélie ULg; Jonius, Bénédicte; DEVOS, Martine ULg et al

Poster (2012, December 18)

The existence and importance of psychosocial needs experienced by spouses of cancer patients have been demonstrated repeatedly. In order to reduce these needs, our study assesses the efficacy of the ... [more ▼]

The existence and importance of psychosocial needs experienced by spouses of cancer patients have been demonstrated repeatedly. In order to reduce these needs, our study assesses the efficacy of the combination of two psychotherapeutic methods: psychosocial needs' organisation into a hierarchy and problem solving. Our longitudinal and randomized study comprises three assessment times, separated from three weeks, (T0, T1 and T2) and two groups (experimental and control). At T0, both groups realize the hierarchy of needs. Between T0 and T1, only the experimental group practices problem solving. Then, between T1 and T2, the control group practices this method too. Questionnaires administered at each assessment time are: sociodemographic questionnaire, Hospital Anxiety and Depression Scale (HADS), Psychosocial Needs Inventory (PNI), self-efficacy questionnaire (GSES). Between T0 and T1, a general improvement in scores is expected in both groups: it is expected to be higher in the experimental group who completed the problem solving. Between T1 and T2, scores in the control group should improve to join those obtained by theexperimental group at T1. Thirty-seven people participated: experimental group (N=19, male=12, female=7) and control group (N=18, male=11, female=7). The results confirm our initial hypotheses and emphasize the importance of taking care of cancer patients' spouses. [less ▲]

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See detailQualité de vie des enfants atteints de mucoviscidose et de leurs parents: Quels sont les prédicteurs?
Toucheque, Malorie ULg; Lemétayer, Fabienne; Missotten, Pierre ULg et al

Poster (2012, December 17)

Introduction. La mucoviscidose est une maladie génétique grave, limitant la durée de vie du patient et entraînant de nombreuses complications. Les progrès scientifiques et médicaux ont conduit à ... [more ▼]

Introduction. La mucoviscidose est une maladie génétique grave, limitant la durée de vie du patient et entraînant de nombreuses complications. Les progrès scientifiques et médicaux ont conduit à l’augmentation de l’espérance de vie, de sorte que l’âge moyen de survie est d’environ 40 ans. Dans ce contexte, la qualité de vie (QV) est devenue un objectif thérapeutique important pour les patients atteints de mucoviscidose. Cependant, malgré un intérêt croissant pour le QV, celle-ci a été sous-investiguée chez les enfants âgés de 6 à 12 ans. Parallèlement, on observe que les professionnels de la santé ne sont plus seuls à intervenir dans la prise en charge du jeune patient. L’essentiel du traitement ayant lieu à la maison, la responsabilité concernant la gestion de la maladie reposent désormais sur les épaules de la famille. Ainsi, les parents d’enfants atteints de mucoviscidose doivent faire face à une variété de stresseurs pouvant entraîner d’importantes implications pour le bien-être psychosocial du système familial. Ces dernières années, le rôle de la famille dans l’adaptation des enfants atteints d’une maladie chronique a reçu une attention particulière. À l’heure actuelle, on reconnaît l’importance et l’influence de la relation parent-enfant dans de multiples aspects du développement social et émotionnel de l’enfant. Cependant, dans les recherches en pédiatrie, les pères sont sous-représentés. C’est principalement la relation mère-enfant malade qui a été pris en considération en ignorant la relation père-enfant malade. Objectifs. Ce projet de thèse s’oriente autour de trois objectifs : (1) étudier l’impact de la mucoviscidose sur la QV et, de manière plus générale, sur l’ajustement de l’enfant et de ses parents ; (2) comprendre le lien entre l’ajustement des parents et celui de l’enfant et identifier les mécanismes spécifiques par lesquels les parents influent sur la QV de l’enfant ; (3) étudier l’effet du genre. Méthodologie. Chaque triade (enfant, père et mère) devra répondre à un ensemble de questionnaire évaluant l’ajustement émotionnel, cognitif et comportemental ainsi que le fonctionnement familial et la qualité de vie. Afin d'isoler la spécificité de la mucoviscidose, trois groupes seront créés : mucoviscidose – asthme – sain. Le début du recrutement est prévu en septembre 2012. Contribution. Cette recherche se veut intégrative et contribuera à mettre en évidence les facteurs prédicteurs de la résilience et des difficultés d’ajustement chez les enfants souffrant de mucoviscidose et leur parent. Les résultats contribueront à l’avancement des connaissances et nous permettraient d’influer sur les initiatives de prévention. [less ▲]

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See detailEmpathy for pain and Alexithymia : a rTMS study
Lemaire, Morgan ULg

Poster (2012, December 12)

Empathy is a multi-facet function regulating social life. In this study, we investigated empathy in relation to alexithymia. Alexithymia is considered as a state showing difficulties in identification and ... [more ▼]

Empathy is a multi-facet function regulating social life. In this study, we investigated empathy in relation to alexithymia. Alexithymia is considered as a state showing difficulties in identification and distinction of one’s own emotional life, as well as difficulties in identification/distinction of others emotions. Thus, alexithymia is considered as an empathy trouble. Previous studies demonstrated that alexithymia is characterized by a particular pattern of cerebral activation comprising some important zones of emotional control (i.e., left DLPFC hyperactivation, left ACC hypoactivation). In the present study, we investigated the electrodermal response of participants during an empathy for pain task before and after an inhibiting rTMS on the right DLPFC to facilitate the ACC activation, with the aim to enhance the emotional expression for alexithymic population. Results showed that rTMS on the right DLPFC increase the relaxation of the alexithymic participants facing the stimuli. This can match our assumptions but further research is needed to clarify this situation. [less ▲]

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See detailSections efficaces de production de rayonnement gamma sur Li et F
Debande, Vivien; Chene, Grégoire ULg; Strivay, David ULg

Poster (2012, December 11)

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See detailOncogenic human papillomavirus could directly interact with Natural Killer cells
Renoux, Virginie; Bastin, Renaud ULg; Boniver, Jacques ULg et al

Poster (2012, December 10)

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See detailCharacterization of chemotherapy-induced cell death in glioblastoma
Coupienne, Isabelle ULg; Fettweis, Grégory ULg; Piette, Jacques ULg

Poster (2012, December 10)

Glioblastoma constitute the most frequent and deadliest type of brain tumors. Their annual incidence is estimated between 5 and 8 cases per 100,000 people in Europe and North America. They are resistant ... [more ▼]

Glioblastoma constitute the most frequent and deadliest type of brain tumors. Their annual incidence is estimated between 5 and 8 cases per 100,000 people in Europe and North America. They are resistant to all current therapies and are associated with a very high rate of recurrence. The associated prognosis is generally very poor and most patients die within a year after diagnosis. Unfortunately, despite extensive research and use of multimodality treatments combining surgical resection, chemotherapy and radiotherapy, survival hasn’t really much improved over the last 20 years. Indeed, these tumors were shown to be characterized by a high radio- and chemo-resistance. Glioblastoma cells exhibit overexpression of the anti-apoptotic Bcl-2 family proteins and downregulation of its pro-apoptotic members, high expression of the IAPs (Inhibitors of Apoptosis Proteins) and constitutive activation of the pro-survival NF-κB pathway. Currently, the most commonly used treatment offering the best prognosis to patients consists in a combination of maximal surgical tumor resection (when feasible) with subsequent radio- and/or chemotherapy. Among the most commonly used chemotherapeutic agents, the alkylating agent temozolomide and the topoisomerase I inhibitor camptothecin occupy a central position. Therefore, in this study, the impact of both temozolomide and irinotecan (a soluble derivative of camptothecin) on glioma cell survival will be investigated. Important progress was made in the comprehension of the molecular mechanisms underlying tumor development and progression however, survival benefits conferred by the use of new drugs and therapeutic strategies are counted in months rather than years. Consequently, there is an urge to rapidly improve the efficiency of the currently used treatments. This research project consists in (i) the study of the mechanisms implicated in glioblastoma cell death induced by two chemotherapeutic agents : temozolomide and irinotecan, (ii) the identification of the mechanisms underlying the resistance of glioblastoma to these treatments, (iii) the use of pharmacological tools to interfere with those resistance strategies to enhance chemotherapy efficiency. Necrosis was, until recently, long thought to be only accidental. However, it was shown to be finely regulated by specific signalling pathways. Programmed necrosis often takes place in cells in which apoptosis cannot be properly activated and serves as a back-up cell death pathway. Previous work from our lab having already demonstrated that glioblastoma are, at least partially, apoptosis-defective, special emphasis is put on the study of necrotic parameters. Results from survival tests performed on several glioblastoma cell lines in the presence of necrotic inhibitors like necrostatin-1 (an inhibitor of the central regulator of the necrotic pathway RIP1) allows to partially overcome temozolomide and irinotecan-induced glioblastoma cell death, highlighting the role played by programmed necrosis in chemotherapy sensitivity. [less ▲]

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See detailSéminaire des chercheurs Télévie 2013
Cimino, Jonathan ULg; Sounni, Nor Eddine ULg; Calligaris, David ULg et al

Poster (2012, December 10)

Séminaire des chercheurs Télévie 2013

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See detailOnline monitoring of the interaction of balls and slurry with the Sensomag ®
Köttgen, Axel; Leroy, Sophie ULg; Bastin, David ULg et al

Poster (2012, December 10)

Presentation of Optimag Project results. Optimag aims to optimize the ball milling operations through the use of an embarked sensor, called the Sensomag, and developed by Magotteaux to monitor in real ... [more ▼]

Presentation of Optimag Project results. Optimag aims to optimize the ball milling operations through the use of an embarked sensor, called the Sensomag, and developed by Magotteaux to monitor in real time the position of the slurry and the grinding balls. [less ▲]

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See detailRole of γδ T cells in HPV-induced cancer progression
Van hede, Dorien ULg; Bastin, Renaud; Francis, Floriane et al

Poster (2012, December 10)

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See detailAnticipating Juno Observations of the Magnetosphere of Jupiter
Bunnell; Fowler; Bagenal et al

Poster (2012, December 07)

The Juno spacecraft will arrive at Jupiter in 2016 and will go into polar orbit. Juno will make the first exploration of the polar regions of Jupiter's vast magnetosphere, combining in situ particles and ... [more ▼]

The Juno spacecraft will arrive at Jupiter in 2016 and will go into polar orbit. Juno will make the first exploration of the polar regions of Jupiter's vast magnetosphere, combining in situ particles and fields measurements with remote sensing of auroral emissions in the UV, IR and radio. The primary science period comprises ~30 orbits with 11-day periods with a~1.06Rj perijove, allowing Juno to duck under the hazardous synchrotron radiation belts. Apojove is at ~38Rj. The oblateness of the planet causes the orbit to precess with the major axis moving progressively south at about 1 degree per orbit, eventually bringing the spacecraft into the radiation belts. This orbit allows unprecedented views of the aurora and exploration of the auroral acceleration regions. We present an overview of anticipated Juno observations based on models of the Jovian magnetosphere. On approach to Jupiter and over a capture orbit that extends to ~180Rj on the dawn flank, Juno will traverse the magnetosheath, magnetopause and boundary layer regions of the magnetosphere. Due to the high plasma pressures in the magnetospheric plasmasheet the magnetosphere of Jupiter is known to vary substantially with the changes in the solar wind dynamic pressure. We use Ulysses solar wind data obtained around 5 AU to predict the conditions that Juno will observe over the several months it will spend in these boundary regions. [less ▲]

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See detailBiorthogonalization Techniques for Least Squares Temporal Difference Learning
Jung, Tobias ULg; Ernst, Damien ULg

Poster (2012, December 07)

We consider Markov reward processes and study OLS-LSTD, a framework for selecting basis functions from a set of candidates to obtain a sparse representation of the value function in the context of least ... [more ▼]

We consider Markov reward processes and study OLS-LSTD, a framework for selecting basis functions from a set of candidates to obtain a sparse representation of the value function in the context of least squares temporal difference learning. To support efficient both updating and downdating operations, OLS-LSTD uses a biorthogonal representation for the selected basis vectors. Empirical comparisons with the recently proposed MP and LARS frameworks for LSTD are made. [less ▲]

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See detailAbundance and phenological model of Harmonia axyridis (Coleoptera: Coccinellidae) in field crops
Vandereycken, Axel ULg; Brostaux, Yves ULg; Joie, Emilie ULg et al

Poster (2012, December 07)

The multicolored Asian ladybeetle Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) was introduced into Western Europe in the late 1990s. This exotic and invasive species is known to thrive ... [more ▼]

The multicolored Asian ladybeetle Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) was introduced into Western Europe in the late 1990s. This exotic and invasive species is known to thrive principally in shrubs and arboreal habitats. We focus on a phonological model and on annual abundance in various field crops. The abundance of H. axyridis adults and larvae were evaluated during a three-year period, from 2009 to 2011, in four important agronomical crops (wheat, corn, broad bean and potato) in Belgium. H. axyridis colonizes and reproduces in all four crops studied, with larger densities observed in corn and broad bean. The reproduction of H. axyridis occurs principally in corn and occurred much less in wheat and potato. From 2009 to 2011, abundances of H. axyridis populations were constant except in corn, where the observed densities of all immature stages and adults were higher in 2011 than in 2009. The population dynamics of aphids and H. axyridis were characterized by a symmetric logistic function (S-shape) based on the cumulative population size. [less ▲]

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See detailShoulder injury prevention in sports using 3D motion capture
Schwartz, Cédric ULg; HAZEE, Amandine ULg; Denoël, Vincent ULg et al

Poster (2012, December 07)

In sports, where regular and intensive training could progressively lead to traumatic situations, accurate measurement of kinematic parameters can help to predict and anticipate injuries. Overhead ... [more ▼]

In sports, where regular and intensive training could progressively lead to traumatic situations, accurate measurement of kinematic parameters can help to predict and anticipate injuries. Overhead throwing athletes may develop an increased stiffness of the shoulder capsule. The resulting diminution of the gleno-humeral range of motion is usually associated with decreased performance and injury risks. This study illustrates the detection of these situations that put the athlete at risk. [less ▲]

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See detailHorizon Partitioning of soil CO2 sources and their Isotopic Composition (13C) in a Pinus Sylvestris
Goffin, Stéphanie ULg; Parent, Florian; Plain, Caroline et al

Poster (2012, December 07)

The overall aim of this study is to contribute to a better understanding of mechanisms behind soil CO2 efflux using carbon stable isotopes. Given (i) the interest of conducting in situ studies with soil ... [more ▼]

The overall aim of this study is to contribute to a better understanding of mechanisms behind soil CO2 efflux using carbon stable isotopes. Given (i) the interest of conducting in situ studies with soil multilayer analysis and (ii) the benefits of isotopic tool to improve mechanistic understanding, these two approaches are combined. Quantifying the origin and the determinism of 13CO2 and 12CO2 production processes in the different soil layers using the gradient-efflux approach is the main goal of this work. To meet this one, the work includes an experimental setup and a modeling approach. The experimental set up (see also communication of Parent et al., session B008) comprised a combination of different systems, which were installed in a Scot Pine temperate forest at the Hartheim site (Southwestern Germany). Measurements include (i) half hourly vertical profiles of soil CO2 concentration (using soil CO2 probes), soil water content and temperature; (ii) half hourly soil surface CO2 effluxes (automatic chambers); (iii) half hourly isotopic composition of surface CO2 efflux and soil CO2 concentration profile and (iv) estimation of soil diffusivity through laboratory measurements conducted on soil samples taken at several depths. Using the data collected in the experimental part, we developed and used a diffusive transport model to simulate CO2 (13CO2 and 12CO2) flows inside and out of the soil based on Fick’s law. Given the horizontal homogeneity of soil physical parameters in Hartheim, we treated the soil as a structure consisting of distinctive layers of 5 cm thick and expressed the fick’s first law in a discrete formalism. The diffusion coefficient used in each layer was derived from (i) horizon specific relationships, obtained from laboratory measurements, between soil relative diffusivity and its water content and (ii) the soil water content values measured in situ. The concentration profile was obtained from in situ measurements. So, the main model inputs are the profiles of (i) CO2 (13CO2 and 12CO2) concentration, (ii) soil diffusion coefficient and (iii) soil water content. Once the diffusive fluxes deduced at each layer interface, the CO2 (13CO2 and 12CO2) production profile was calculated using the (discretized) mass balance equation in each layer. The results of the Hartheim measurement campaign will be presented. The CO2 source vertical profile and its link with the root and the Carbon organic content distribution will be showed. The dynamic of CO2 sources and their isotopic signature will be linked to climatic variables such soil temperature and soil water content. For example, we will show that the dynamics of CO2 sources was mainly related to temperature while changing of isotopic signature was more correlated to soil moisture. [less ▲]

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See detailLikely Detection of UV Auroral Emission from the Magnetic Footprint of Callisto
Clarke, John; Bhattacharyya, Dolon; Montgomery, Jordan et al

Poster (2012, December 06)

A large number of UV images of Jupiter's aurora were obtained in 2007/2008 with the Hubble Space Telescope (HST) ACS/SBC camera. The initial results on variations with the solar wind conditions have been ... [more ▼]

A large number of UV images of Jupiter's aurora were obtained in 2007/2008 with the Hubble Space Telescope (HST) ACS/SBC camera. The initial results on variations with the solar wind conditions have been published elsewhere, but the large database permits other studies to be performed. In particular, while auroral emissions have been detected from the magnetic footprints of Io, Europa, and Ganymede in Jupiter's atmosphere, the footprint of Callisto has been located too close to the main auroral oval to be detected. We have thus analyzed images of the ultraviolet auroral emissions of Jupiter taken using the F115LP filter on the HST/ACS instrument. Using a unique co-addition method, we have identified a strong candidate for the footprint of Callisto on May 24, 2007. We tested this finding by applying the same co-addition method to a nearly identical auroral configuration on May 30, 2007 when Callisto was well removed in its orbit. Comparing the two co-added images, we can clearly see the presence of Callisto’s footprint on the 24th and its absence on the 30th. The method relies as well on the motion of Callisto's footprint remaining under the satellite, while most of the auroral emissions rotate with the planet. The images and analysis method will be presented in this presentation. [less ▲]

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See detailAnomalous OI-989 Å intensity profile: solving an old mystery.
Hubert, Benoît ULg; Gérard, Jean-Claude ULg; Shematovich, Valery I. et al

Poster (2012, December 06)

Sounding rocket measurements conducted in 1988 under high solar activity conditions had revealed that the intensity of the thermospheric OI emission at 989 Å presents an anomalous vertical profile ... [more ▼]

Sounding rocket measurements conducted in 1988 under high solar activity conditions had revealed that the intensity of the thermospheric OI emission at 989 Å presents an anomalous vertical profile. Observation presents an intensity much higher than what can be expected compared with theoretical results including the photochemical sources of excited oxygen and the radiative transfer of the photons of the OI-989 sextuplet especially above the exobase. Attempts were conducted to clarify the discrepancy by including the non-thermal O(3P) population that appears around the exobase and higher, and that can scatter Doppler-shifted photons of the line profile farther from the rest wavelength. All attempts based on detail modeling of the photochemical processes and radiative transfer revealed unable to account for the discrepancy. Recently the FUV and EUV solar flux has been obtained at very high spectral resolution with the SOHO-SUMER instrument, revealing a significant solar oxygen emission at 989 Å, i.e. a source of photons that had never been accounted for before. In this study, we compute the radiative transfer of the OI-989 Å multiplet including the photochemical sources of excited oxygen, the scattering of incident solar photons and the effect of non-thermal atoms. We find a good agreement with the previous sounding rocket observation, solving the old mystery. We also compare the model simulations with the observations of the STP-78 satellite to better determine the relative importance of the various parameters at work in the radiative transfer of the OI-989 Å multiplet. [less ▲]

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See detailUsing a 2D Model of the Io Plasma Torus to Investigate the Effects of Density Variations on the Morphology and Intensity of the Io Footprint
Payan, Alexia; Rajendar, Ashok; Paty, Carol et al

Poster (2012, December 06)

Io is the primary source of plasma in the Jovian magnetosphere, continuously releasing approximately 1 ton/s of SO2 from volcanic eruptions. The interaction of Io with Jupiter’s magnetosphere is strongly ... [more ▼]

Io is the primary source of plasma in the Jovian magnetosphere, continuously releasing approximately 1 ton/s of SO2 from volcanic eruptions. The interaction of Io with Jupiter’s magnetosphere is strongly influenced by the density structure of the resulting plasma torus and the position of Io relative to the center of the torus [Bonfond et al. 2008]. This unusual interaction produces a complex auroral feature on Jupiter’s ionosphere known as the Io footprint. Hubble Space Telescope (HST) observations of Jupiter’s far-UV aurora during spring 2007 showed an increased number of isolated auroral blobs along with a continuous expansion of Jupiter’s main auroral oval over a few months. These blobs were associated with several large injections of hot plasma between 9 and 27 Jovian radii. These events coincided with a large volcanic eruption of the Tvashtar Paterae on Io, as observed by the New Horizons spacecraft [Spencer et al., 2007]. This, in turn, may have resulted in a significant increase in the plasma torus density. Besides, on June 7th, 2007, the Io footprint momentarily became so faint that it disappeared under a diffuse patch of emission remaining from an injection blob [Bonfond et al., 2012]. The goal of the present study is to examine the relationship between the increased density of the plasma torus and the dimming of the Io footprint. We implement a 2D model of the Io plasma torus that treats the variable-density torus as being composed of discrete layers of uniform density. As the co-rotating plasma in the plasma torus impinges on Io, Alfvén waves are launched at a pushback angle obtained from Gurnett and Goertz [1981]. The waves propagate inside the plasma torus through reflection and refraction at density discontinuities where they lose some of their initial energy. Using the above model, we can track the Alfvén wave fronts in the plasma torus and determine the longitude at which they exit the torus along with the corresponding remaining energy. Since Alfvén waves are capable of accelerating charged particles along magnetic field lines, we assume that the discrete Io footprint features are created at these longitudes, and that the intensity of each of these features is positively correlated to the energy transported by the wave front as it exits the plasma torus. Therefore, the model allows us to investigate both the effects of density changes and of Io’s position in the plasma torus on the intensity and the morphology of the Io footprint. In this context, the model enables us to determine the density increase in the plasma torus required to explain the apparent disappearance of Io footprint given its position at that time. [less ▲]

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See detailInsulin clearance during hyper-insulinemia euglycemia therapy
Penning, Sophie ULg; MASSION, Paul ULg; Pretty, Christopher ULg et al

Poster (2012, December)

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See detailAllelopathic potential of Tunisian barley against weeds
Bouhaouel, Imen ULg; Gfeller, Aurélie; Fauconnier, Marie-Laure ULg et al

Poster (2012, December)

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See detailL'intelligence émotionnelle et l'anxiété chez l'enfant: Quel liens?
Stassart, Céline ULg; Etienne, Anne-Marie ULg

Poster (2012, December)

Introduction: The concept of emotional intelligence (EI) is characterized by an individual difference to feel, identify, understand, regulate and use their own emotions and those of others. Several ... [more ▼]

Introduction: The concept of emotional intelligence (EI) is characterized by an individual difference to feel, identify, understand, regulate and use their own emotions and those of others. Several studies show a negative association between EI and various fields such as depression and anxiety. At various times, EI has been described as a protective factor against the development of certain disorders or dysfunctions. However, these studies have often been conducted with an adult population and fewer children. But a child is not a miniature adult, there may be differences between child emotional life and that of an adult. Objectives: This study aims to examine the internal consistency of the short version of the scale and French IE in children. Then, the association between EI and trait anxiety is studied, and the share of explanatory IE in the presence of trait anxiety in children, taking into account the effect of gender. Methods: A sample of 198 Belgian children aged between 9 and 13 years old completed the Trait Emotional Intelligence Questionnaire - Short Form Children (TEIQue - CSF) and the State Trait Anxiety Index for Children (STAIC). Results: We observe a good internal consistency of the French version of TEIQue - CSF (α = .83) and a negative correlation between EI and STAIC (r = - .43). The regression analyzes show that EI significantly explains 18% of the variance STAIC. No gender effect was observed. Discussion: As expected, this study demonstrates a negative association between emotional intelligence of the child and the presence of anxiety symptoms, as well as the lack of gender effect in the scores of EI. We also note that the scores TEIQue - CSF significantly predict the presence of anxiety symptoms in boys as well as girls. This is consistent with other studies in a population of adults or adolescents. [less ▲]

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See detailDevelopment of Highly Active doped Titania Photocatalysts by Aqueous Sol-Gel Processing
Malengreaux, Charline ULg; Douven, Sigrid ULg; Poelman, Dirk et al

Poster (2012, December)

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See detailThe 2006 Adjuvant Trastuzumab Convention in Belgium: 5 years later
VANDERHAEGEN, J; PARIDAENS, R; PICCART, M et al

Poster (2012, December)

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See detailLa diversité bactérienne et son évolution pendant la conservation de viandes bovines fraîches de différentes origines conditionnées sous vide
Didimo Imazaki, Pedro Henrique ULg; Tahiri, Assia ULg; Taminiau, Bernard ULg et al

Poster (2012, December)

Le but de cette étude à été d'évaluer la diversité bactérienne et son évolution pendant la conservation de viandes bovine fraîches sous vide, en fonction de leur origine et du respect ou non d’une ... [more ▼]

Le but de cette étude à été d'évaluer la diversité bactérienne et son évolution pendant la conservation de viandes bovine fraîches sous vide, en fonction de leur origine et du respect ou non d’une température proche du point de congélation. Les dénombrements réalisés ont mis en évidence que les viandes d’origines britannique et belge testées présentent un écosystème microbien différent. Les analyses par approche métagénomique permettront d’éclaircir ces différences, surtout en ce qui concerne la présence de bactéries pouvant jouer un rôle "bioprotecteur" permettant d’améliorer la conservabilité des viandes. [less ▲]

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See detailModel-based glycemic control in critical care
Pretty, Christopher ULg; Penning, Sophie ULg; Le Compte, Aaron J. et al

Poster (2012, December)

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See detailGenetic parameters for individual weights at birth, weaning and 60 days of stress negative Piétrain pigs in the tropics: the case of Vietnam
Do Duc, Luc ULg; Michaux, Charles ULg; Dang Vu, Binh et al

Poster (2012, November 28)

Data recorded between 2008 and 2012 from Dong Hiep pig farm, Vietnam, was used to stimate genetic parameters for weights at birth (WB), weaning (WW) and 60 days (W60) of stress negative Piétrain pigs ... [more ▼]

Data recorded between 2008 and 2012 from Dong Hiep pig farm, Vietnam, was used to stimate genetic parameters for weights at birth (WB), weaning (WW) and 60 days (W60) of stress negative Piétrain pigs using restricted maximum likelihood methodology. WB, WW and W60 were recorded from 1146, 839 and 610 animals respectively. The data were analyzed according to a mixed model including 4 fixed effects, parity, season, sex, and interaction between halothane genotype and country of origin (Belgium and Vietnam) of sows. Additionally, 3 random effects (maternal common environment for litter, direct and maternal additive genetic) for WB and 2 random effects (maternal common environment for litter and direct additive genetic) for WW and W60 were included in the model. Estimates of direct heritability and proportion of the maternal common environmental variance for WB, WW and W60 were 0.20, 0.13; 0.22, 0.21 and 0.19, 0.30 respectively. In addition, the estimate of maternal heritability for WB was 0.14. These genetic parameters suggest that WB, WW and W60 could be improved by selection using both direct and maternal effects. [less ▲]

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See detailWhy bother ?
Nazé, Yaël ULg; Bouquiaux, Laurence ULg

Poster (2012, November 27)

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See detailA study of Electra posidoniae Gautier (Cheleistomata, Anasca), a bryozoan strictly found as epiphyte of the seagrass Posidonia oceanica (L.) Delile.
Lepoint, Gilles ULg; Mouchette, Olivier; Pelaprat, Corinne et al

Poster (2012, November 26)

Species living as epiphytes of marine macrophytes have often important role in ecosystem functioning, such as food web suppliers. Some animal or algae species may be considered as really specialised in ... [more ▼]

Species living as epiphytes of marine macrophytes have often important role in ecosystem functioning, such as food web suppliers. Some animal or algae species may be considered as really specialised in the colonization of plant substrate and often dominates epiphytic community, particularly, on long life-span seagrass and macroalgae species. Because epiphytic compartment dysfunction is often implied in seagrass human-induced declining, it is important to understand dynamics and life traits of its specific component in pristine area. In our study, colonization dynamics, biomass seasonality, diet composition of Electra posidoniae, an epiphytic bryozoa, strictly found on the leaves of the seagrass Posidonia oceanica and dominating the leaf epifauna, were assessed monthly at 10 metre depth in the Revellata Bay (Corsica, Mediterranean sea). Aiming to delineate their trophic role in the ecosystem, we have performed bulk stable isotopes measurements and gut content analysis. [less ▲]

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See detailZnO/PVA Macroscopic Fibers Bearing Anisotropic Photonic Properties
Kinadjian, Natacha ULg; Achard, Marie-France; Julian-Lopez, Beatriz et al

Poster (2012, November 25)

Composite PVA/ZnO-nanorods fibers, synthesized through co-axial flux extrusion exhibit higher anisotropic photonic properties, both in absorption and emission, as a result of the collective alignment of ... [more ▼]

Composite PVA/ZnO-nanorods fibers, synthesized through co-axial flux extrusion exhibit higher anisotropic photonic properties, both in absorption and emission, as a result of the collective alignment of the ZnO nanorods along the main axis of the PVA fiber. This photonic anisotropy is triggered by a synergistic interaction between the PVA matrix, stretched above the glass transition temperature (Tg), and cooled down under strain. Compared with non-elongated fibers that present an isotropic emission, composite fibers previously submitted to a tensile stress absorb selectively UV emission when the polarized laser beam is parallel to the main axis of the fiber. In addition, their photolumincescence is also anisotropic, with a waveguide behavior along the main axis of the fiber. Mechanical properties of these composite fibers are also drastically improved, compared with pure PVA fibers: the longitudinal Young modulus of these fibers is increased from 2 to 6 GPa upon ZnO addition, a value similar to those already observed for composite fibers, prepared either with carbon nanotubes, or V2O5 macroscopic fibers. [less ▲]

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