References of "Poster"
     in
Bookmark and Share    
Full Text
See detailKnowledge about physical activity among older adults: Short term effects of a neighbourhood environment internet-based intervention
Mouton, Alexandre ULg; Rompen, Jérôme ULg; Cloes, Marc ULg

Poster (2013, May)

Purpose. Despite the numerous health benefits, population physical activity levels are low and decline with age. Few studies exposed that a better knowledge about physical activity could encourage people ... [more ▼]

Purpose. Despite the numerous health benefits, population physical activity levels are low and decline with age. Few studies exposed that a better knowledge about physical activity could encourage people to become physically active, which constitute a critical health challenge for older people. Moreover, neighbourhood environment internet-based interventions are recommended to promote physical activity. Therefore, the main purpose of this study was to explore the effects of a neighbourhood environment internet-based intervention on knowledge about physical activity among older adults. Methods. At baseline, 87 older adults (60.69 ± 7.85 years) from the same district were assigned to an intervention (n = 41) or a control (n = 46) group. The two months intervention was composed of a comprehensive physical activity promotion website, with an emphasis on neighbourhood environment contents, and a monthly personalized email based on the stage of change theory. Physical activity knowledge was assessed by questionnaires at baseline, after one and two month of the intervention, and after one month follow-up. Results. After the intervention, knowledge of the physical activity recommendations significantly improved in the intervention group (p = 0.032), while the control group remained unchanged. Besides, knowledge about environmental opportunities for physical activity increased slightly only in the intervention group. Conclusions. These findings suggest that a neighbourhood environment internet-based intervention can result in modest improvements of the physical activity knowledge in older adults. Further research should focus on alternative ways to improve the knowledge about local opportunities for physical activity and its relationship with long term effects on behaviour change. [less ▲]

Detailed reference viewed: 34 (21 ULg)
Full Text
Peer Reviewed
See detailLe référentiel "quartiers durables"
Marique, Anne-Françoise ULg; Loiseau, Véronique ULg; Godard, Florence et al

Poster (2013, April 30)

Detailed reference viewed: 69 (16 ULg)
Full Text
See detailThe TRAPPIST survey of southern transiting planets – Physical properties of the WASP-36 planetary system
Delrez, Laetitia ULg; Gillon, Michaël ULg; Jehin, Emmanuel ULg et al

Poster (2013, April 29)

We present ten new transit light curves obtained with the TRAPPIST (TRAnsiting Planets and PlanetesImals Small Telescope) and Euler telescopes for the recently discovered planetary system WASP-36 (Smith ... [more ▼]

We present ten new transit light curves obtained with the TRAPPIST (TRAnsiting Planets and PlanetesImals Small Telescope) and Euler telescopes for the recently discovered planetary system WASP-36 (Smith et al. 2012). Thanks to this extensive data set, we are able to confirm and improve the parameters of the system. WASP-36 is a solar-mass G2 dwarf which hosts a giant planet on a 1.54 d orbit. With a mass of ~2.3 MJup and a radius of ~1.3 RJup, this planet is slightly denser than Jupiter. One of the most interesting properties of the system is its low stellar metallicity ([Fe/H] =-0.26+-0.10), as giant planets are actually known to be rare around such stars (e.g. Fischer & Valenti 2005). Furthermore, due to its small orbital distance and large radius, WASP-36b is an exquisite target for spectrophotometric emission measurements able to constrain the thermal and chemical properties of its atmosphere. [less ▲]

Detailed reference viewed: 15 (0 ULg)
Full Text
See detailA comparative Genome-Wide Association Interaction study using BOOST and MB-MDR algorithms on Ankylosing Spondylitis
Bessonov, Kyrylo ULg

Poster (2013, April 29)

Genome-Wide Association (GWA) studies have gained popularity after the completion of the Human Genome Project and advancement of high-throughput technologies. These studies aim to scan thousands of ... [more ▼]

Genome-Wide Association (GWA) studies have gained popularity after the completion of the Human Genome Project and advancement of high-throughput technologies. These studies aim to scan thousands of genomic variations (e.g., SNPs) for their association to phenotypic variables (i.e. traits), such as disease related phenotypes, with the hope of extracting biologically and clinically relevant information. Understanding of genetic, environmental as well as other components of the disease brings the key insights into disease pathology and approaches us closer to the ultimate goal - personalized medicine. In this work we rely on a minimal GWAI protocol for genome-wide epistasis detection using SNPs, as developed in our lab [6][9]. Using the advanced non-parametric Model-Based Multifactor Dimensionality Reduction (MB-MDR) method [1] and BOolean Operation-based Screening and Testing (BOOST) algorithms [4][*] for detection of statistically significant epistatic SNP-SNP interactions, we investigate the effect of exhaustive (BOOST) and non-exhaustive (MB-MDR) marker processing strategies, LD effects, as well as different adjustment schemes for lower-order effects (i.e. epistasis). Our approach was tested on Ankylosing Spondylitis (AS) data as provided by the WTCCC2 consortium [1]. AS is a long-term / chronic disease characterized by inflammation of the joints between the spinal bones. Non-steroidal anti-inflammatory drugs calming down the immune system inflammatory responses are used as a treatment but there is no permanent cure for AS. The disease has also a strong environmental component and affects 3.5 - 13 per 1,000 people in USA [5] [less ▲]

Detailed reference viewed: 24 (3 ULg)
Full Text
See detailPuff pastry margarines performances related to their physicochemical properties
Lefebure, Emilie ULg; Cavillot, Valérie; Blecker, Christophe ULg et al

Poster (2013, April 28)

Detailed reference viewed: 17 (3 ULg)
Peer Reviewed
See detailModeling simple lipid phase separation and effects of amphiphilic molecules on lipid domains
Lins, Laurence ULg; Deleu, Magali ULg; Mingeot-Leclercq, Marie-Paule et al

Poster (2013, April 28)

Detailed reference viewed: 15 (3 ULg)
Peer Reviewed
See detailComparison of Real-Time Aspergillus PCR with Platelia™AspergillusEIA in broncho-alveolar lavage fluids for the diagnosis of invasive aspergillosis in neutropenic and non-neutropenic patients
RUZICKA, NADIA; BOREUX, Raphaël ULg; LEVAUX, Laetitia ULg et al

Poster (2013, April 27)

Objectives. Because of low sensitivity of fungal cultures and lack of standardization of Aspergillus PCR, laboratory diagnosis of invasive aspergillosis still relies on galactomannan (GM) detection in ... [more ▼]

Objectives. Because of low sensitivity of fungal cultures and lack of standardization of Aspergillus PCR, laboratory diagnosis of invasive aspergillosis still relies on galactomannan (GM) detection in broncho-alveolar lavage (BAL) fluids and serum. The aim of this study was double: first, to assess the place of a 18S rRNA Aspergillus real-time PCR test performed in BAL fluid for the diagnosis of invasive aspergillosis (IA) in neutro- and non-neutropenic patients in comparison with GM detection; secondly, to evaluate the use of three different GM cut-off values. Materials and methods. A total of 111 neutropenic and non-neutropenic patients hospitalized at the University hospital of Liège from March to October 2012 with suspicion of IA were included in the study. A total of 138 broncho-alveolar lavage fluids were evaluated by three laboratory diagnostic methods: 1/ culture on Sabouraud agar slants with antibiotics (bioMérieux, France) incubated at 28°C for 28 days; 2/ GM detection (Platelia ™Aspergillus EIA, Biorad) using GM index cut-off values at 0.5, 0.8 and 1, performed three times a week; 3/ a real-time Aspergillus PCR assay performed daily and targeting the 18S rRNA genes by using an in-house method. Clinical, radiological and microbiological data were reviewed for classification of patients. Results. Nine patients developed probable or possible IA. The sensitivity/specificity/positive (VPP) and negative (NPV) predictive values (%) for culture, PCR, and GM using 0,5 as cut-off value were respectively 41/100/100/94, 58/97/70/96, and 91/83/34/99. The use of 0,8 and 1 as GM index cut-off values increased the specificity to 89 and 92% respectively, and the VPP to 44 and 54%. PCR had a better turn-around time and allowed the detection of Aspergillus colonisation. Conclusion: GM detection in BAL fluids using a cut-off value of 1 was the most efficient laboratory test for the diagnosis of IA in neutropenic and non-neutropenic patients. Despite a lower sensitivity, PCR had a better VPP, and allowed the detection of culture-negative Aspergillus colonisations. A shorter turnaround time (TAT) due to daily practice of PCR tests may reduce the time-to-treatment up to 24 hours. [less ▲]

Detailed reference viewed: 182 (18 ULg)
Full Text
See detailMise en place d’une typologie des pierres à aiguiser. Application à cinq sites gallo-romains
Thiebaux, Aurélie ULg; Goemaere, Eric; Hanut, Frédéric et al

Poster (2013, April 27)

Detailed reference viewed: 8 (1 ULg)
See detailUse of supercritical carbon dioxide to elaborate drug-loaded polymeric implants
Champeau, Mathilde; Thomassin, Jean-Michel ULg; Jérôme, Christine ULg et al

Poster (2013, April 25)

Detailed reference viewed: 9 (1 ULg)
Full Text
Peer Reviewed
See detailReturn-To-Play criteria after hamstring injury: actual medicine practice in professional soccer
Delvaux, François ULg; Rochcongar, Pierre; Bruyère, Olivier ULg et al

Poster (2013, April 25)

Detailed reference viewed: 174 (14 ULg)
Full Text
See detailIntraocular lenses with functionalized surfaces by biomolecules in relation with lens epithelial cell adhesion
Huang, Yi-Shiang ULg; Alexandre, Michaël ULg; Bozukova, Dimitriya et al

Poster (2013, April 25)

A cataract is pathology opacity of the lens or capsule of the eye, causing impairment of vision or even blindness. Surgery, with lens extraction and intraocular lens implantation, is still the only ... [more ▼]

A cataract is pathology opacity of the lens or capsule of the eye, causing impairment of vision or even blindness. Surgery, with lens extraction and intraocular lens implantation, is still the only currently available treatment. The most common complication after implantation of intraocular lenses (IOLs) is the posterior capsular opacification (PCO) or secondary cataract. This is the result of lens epithelial cells (LECs) proliferation and their transition to mesenchymal cells. In 1997, a Sandwich theory was proposed to elucidate the developmental process of PCO. [1] According to this model, an IOL with higher affinity to LECs will induce a less PCO. In our research, the pHEMA (Poly(2-hydroxyethyl methacrylate)) based acrylic hydrophilic polymer is subjected to the surface modification by conjugating with the bioactive peptides. The RGD sequence, known for its excellent biocompatibility, is designed to stimulate the biointegration between the LECs and the polymer implant. [2]. From our research, The RGD peptide immobilized onto pHEMA surfaces significantly facilitates the adhesion of the porcine LEC. The peptide immobilized surface retains its biological function even after 10 times of autoclave. On the other hand, the immobilized peptide does not alter the hydrophobicity of the surface, the light transmission, as well as the cytotoxicity of the material. This functionalized biomaterial would possibly prevent the formation of PCO. [1] J Cataract Refract Surg. 1997 Dec;23(10):1539-42 [2] Trends Biotechnol. 2008 Jul;26(7):382-92 [less ▲]

Detailed reference viewed: 27 (6 ULg)
Full Text
See detailTime variyng groundwater flux measurement using a single well tracer technique
Jamin, Pierre ULg; Brouyère, Serge ULg; Bour, Olivier et al

Poster (2013, April 24)

Contaminant mass discharge measurements are often performed at given times or integrated over a certain period of time, using active or passive sampling techniques. One problem arising is that such ... [more ▼]

Contaminant mass discharge measurements are often performed at given times or integrated over a certain period of time, using active or passive sampling techniques. One problem arising is that such measurements may not be representative of the temporal dynamics of the mass discharge variations. These variations can be caused by fluctuations in contaminant concentrations or, more frequently, by changes in the groundwater fluxes. Pollutant mass fluxes are typically estimated through a combination of solute concentrations and groundwater fluxes measured across a control plane made of several multi-level wells. Accurate measurements of local transient Darcy fluxes have been recognized as the weakest points in most of the developed techniques for groundwater contaminant mass flux measurements. The main objective here is to extend the FVPDM technique for temporal monitoring of groundwater fluxes and to demonstrate its ability to be used in combination with passive sampling devices for measurement of contaminant mass fluxes in groundwater. The Finite Volume Point Dilution Method (FVPDM) is a single well tracer technique for the measurement of local groundwater fluxes based on the continuous injection of tracer at very low injection rate (Brouyère et al. 2008). These developments are based on the application of the adapted technique on a case study in a fractured granitic aquifer in Ploemeur (France). This application investigates transient groundwater fluxes that are controlled by pumping in a well nearby the tested piezometers. Long monitoring time series have been recorded under these controlled conditions of transient groundwater flow. Results show the high sensivity of the FVPDM technique to small variations in groundwater flow velocities and its aptitude for long term monitoring of groundwater fluxes. The comparison between the results of FVPDM and classical point dilution tests performed in same conditions shows close correlation. Interpretation of FVPDM tests in transient conditions have been developed together with an evaluation of the uncertainties that can happen if the frequency of the groundwater flow variations is high. The tests carried on the Ploemeur site also illustrate the first ever application of the FVPDM technique between a double-packer system used for the investigation of a defined layer of an aquifer. This innovative application of the FVPDM using packers opens concrete perspectives for investigation of vertical heterogeneities of groundwater fluxes across a well. [less ▲]

Detailed reference viewed: 41 (9 ULg)
Full Text
See detailCFD Modelisation of homogeneous distribution of solid particles in a stirred tank
Calvo, Sébastien ULg; Delafosse, Angélique ULg; Collignon, Marie-Laure ULg et al

Poster (2013, April 24)

In this work, we study the conditions needed to reach homogeneous distribution of solid particles of aluminium salts in water inside a torospherical bottom shaped stirred tank reactor of 70L equipped with ... [more ▼]

In this work, we study the conditions needed to reach homogeneous distribution of solid particles of aluminium salts in water inside a torospherical bottom shaped stirred tank reactor of 70L equipped with a Pfaudler RCI type impeller and three equi-spaced vertical baffles. The aim of the present study is to develop a CFD model describing the quality of particle distribution in industrial scale tanks. This model, validated with experimental data, is afterward used to developed scale-up and scale-down correlations to predict the minimum impeller speed needed to reach homogeneous solid distribution Nhs. The commercial CFD software Fluent 14 is used to model the fluid flow and the solid particle distribution in the tank. The 3D geometry of the tank and the associated mesh are respectively realized by Ansys 14 DesignModeler and Meshing. The Sliding-Mesh approach is used to take the impeller motion into account. Assuming that the discrete solid phase has no influence on the continuous liquid phase behaviour, the fluid flow dynamics may be simulated independently using the well-known k-ε turbulence model. The behaviour of the liquid-solid mixture is then described by implementing the Eulerian Mixture model. Liquid velocity fields simulated by CFD have been validated by comparison with PIV (Particle Image Velocimetry) measurements. Computed values of Nhs are compared with good agreement to experimental data obtained with a nephelometric probe. Results obtained at different scales allowed correlating the Nhs value to the volumetric power consumption. [less ▲]

Detailed reference viewed: 36 (6 ULg)
Full Text
Peer Reviewed
See detailEvaluation of Shielding Effectiveness in the Time Domain using a DG Method with an Efficient PML
Modave, Axel ULg; Geuzaine, Christophe ULg; Boubekeur, Mohamed et al

Poster (2013, April 24)

Development of new electric and electronic devices leads to an increasing importance for solving electromagnetic compatibility problems. In particular, the optimization of radiated emissions is ... [more ▼]

Development of new electric and electronic devices leads to an increasing importance for solving electromagnetic compatibility problems. In particular, the optimization of radiated emissions is increasingly done through numerical modeling. In this context, numerical methods allow to evaluate the effectiveness of more and more elaborate shielding enclosures. We propose an application of the nodal Discontinuous Galerkin method to evaluate the effectiveness of composite shieldings in the time domain. This numerical method provides convenient advantages to deal with shielding problems. Firstly, heterogeneous media are naturally included in the discrete formulation. After, the method is famous to allow a massive parallelization for the numerical resolution. Finally, a resolution in the time domain allows to consider transient signals. The numerical scheme is firstly validated using an academic benchmark. In the same way, the PML used to truncate the computational domain is optimized and validated. Applications are then presented for homogeneous and composite shieldings. The preliminary results are in conformity with classical predictive rules. [less ▲]

Detailed reference viewed: 56 (9 ULg)
Full Text
Peer Reviewed
See detailDiffuse urban and industrial groundwater pollution with metallic trace elements A comparison between affected and unaffected areas
Gesels, Julie ULg; Dollé, Fabien ULg; Leclercq, Julie et al

Poster (2013, April 22)

For metalic trace elements, spatially distributed background concentrations will be defined as a function of geological and hydrogeological context and considering the impact of diffuse pollution.

Detailed reference viewed: 26 (4 ULg)
Full Text
See detailIntegrated field assessment of contaminant fate and transport in the unsaturated and saturated zone
Fernandez de Vera, Natalia ULg; Peña Hernandez, Juan Angel ULg; Jamin, Pierre ULg et al

Poster (2013, April 22)

In the poster, a multidisciplinary methodology is presented with the aim of characterizing fate and transport of pollutants in the vadose and the saturated zone of industrial sites. The methodology used ... [more ▼]

In the poster, a multidisciplinary methodology is presented with the aim of characterizing fate and transport of pollutants in the vadose and the saturated zone of industrial sites. The methodology used for the vadose zone consist in the combination of the Vadose Monitoring System, cross-hole and surface geophysics at a local scale. For saturated zone studies, the approach consist in the chemical and isotopic analysis of the various contaminants present on site at regional scale. [less ▲]

Detailed reference viewed: 56 (11 ULg)
Full Text
See detailFunctional study of the Ser/Arg-rich splicing factor SRSF5a during zebrafish embryonic development.
Joris, Marine ULg; Larbuisson, Arnaud ULg; Muller, Marc ULg et al

Poster (2013, April 18)

To investigate the role of the splicing factor SRSF5a during zebrafish embryonic development, we performed SRSF5a knockdown by morpholino microinjection and we analysed control and morphant transcriptomes ... [more ▼]

To investigate the role of the splicing factor SRSF5a during zebrafish embryonic development, we performed SRSF5a knockdown by morpholino microinjection and we analysed control and morphant transcriptomes using RNA sequencing. [less ▲]

Detailed reference viewed: 48 (11 ULg)
Full Text
See detailMolecular analysis of root medium impact on Arabidopsis thaliana development
Bouché, Frédéric ULg; André, Julie; Tocquin, Pierre ULg et al

Poster (2013, April 18)

Hydroponics and soil are the most common media used for plant growth. Hydroponics has the main advantage of providing easy access to the root system and is therefore commonly used for gene expression ... [more ▼]

Hydroponics and soil are the most common media used for plant growth. Hydroponics has the main advantage of providing easy access to the root system and is therefore commonly used for gene expression analyses in molecular studies of the model plant Arabidopsis thaliana. However, the impact of root substrate on plant growth remains poorly documented. Here we show that hydroponics accelerates both shoot growth and developmental phases as compared with culture on soil. In order to identify molecular changes in the roots that could account for these medium effects, a transcriptomic comparison was performed by microarray analysis. This experiment revealed that more than 20% of the genes were differentially expressed in hydroponics vs soil. Among them, the flowering time gene FLOWERING LOCUS C and two clades of microRNA targeted genes. To further assess the role of these genes in roots, artificial microRNAs were designed for root specific expression in transgenic Arabidopsis plants. [less ▲]

Detailed reference viewed: 62 (6 ULg)
Full Text
See detailValidation of a LC-MS analytical method for the measurement of aldehydes in meat and oil
Tihon, Angélique; Douny, Caroline ULg; Bayonnet, Pierre ULg et al

Poster (2013, April 18)

Detailed reference viewed: 15 (4 ULg)
Full Text
See detailTowards identification of active root-secreted proteases of Arabidopsis thaliana.
Lallemand, Jérôme ULg; Désiron, Carole ULg; Périlleux, Claire ULg et al

Poster (2013, April 18)

Besides traditional production systems, such as bacteria, yeasts and mammal cells, plants can now be used to produce eukaryotic recombinant proteins. Their advantages as hosts for proteins production ... [more ▼]

Besides traditional production systems, such as bacteria, yeasts and mammal cells, plants can now be used to produce eukaryotic recombinant proteins. Their advantages as hosts for proteins production include correct post-translational modifications, low cost of maintenance and no risk of contamination by human pathogens. Targeting heterologous proteins to the extracellular space is required for the correct folding of complex proteins and makes harvesting and purification easier. However, the quantity and the quality of recombinant proteins have been proved to be reduced by the action of endogenous co-secreted proteases. In this study, we characterized root-secreted proteases in the model plant Arabidopsis thaliana, at the activity and expression levels. Their activity was analyzed by in vitro degradation of a target protein (Bovine Serum Albumine, BSA) in a range of pH and in the presence of several proteases inhibitors. Serine proteases were identified as the major protease class involved in the degradation of BSA under all tested conditions. As a first step towards the identification of the key players, the expression level of selected members of this class was analyzed by quantitative RT-PCR in roots and leaves. [less ▲]

Detailed reference viewed: 55 (10 ULg)
Full Text
See detailImprovement of spray retention on barley leaves by adjuvants
Boukhalfa, Hassina dite Hafida ULg; Massinon, Mathieu ULg; Lebeau, Frédéric ULg

Poster (2013, April 18)

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 ▲]

Detailed reference viewed: 37 (4 ULg)
Full Text
See detailInfluence of the protein context in the aggregation of polyQ proteins into amyloid fibrils
Huynen, Céline ULg

Poster (2013, April 18)

Ten neurodegenerative diseases, referred to as polyglutamine (polyQ) diseases, are associated with the aggregation into amyloid fibrils of ten different proteins containing a polyQ expansion higher than a ... [more ▼]

Ten neurodegenerative diseases, referred to as polyglutamine (polyQ) diseases, are associated with the aggregation into amyloid fibrils of ten different proteins containing a polyQ expansion higher than a pathological threshold comprised between 35 to 45Q (1, 2). A large body of evidence indicate that the polyQ expansion is the critical determinant for the aggregation of these polyQ proteins. The aggregation process of polyQ proteins is, however, still not well understood. To better understand this mechanism at a molecular level, we have characterized model polyQ proteins made of the β-lactamase BlaP from Bacillus licheniformis 749/C and a polyQ tract of 0 to 79Q inserted either at position 197 or position 216 of BlaP. Those chimeras recapitulate the same aggregation behaviours than that of disease-associated polyQ proteins: there is a glutamine threshold for the aggregation into amyloid fibrils and the anticipation phenomenon. Most importantly, the threshold critically depends on the structural integrity of BlaP (3) which would impose some conformational and/or sterical constraints to the polyQ tract. Moreover the position of the polyQ insertion into BlaP modifies the aggregation propensity of BlaP chimeras. The present work aims to further investigate (i) how the protein context affects the different phases of the aggregation phenomenon (i.e. the nucleation and elongation phases) and (ii) the role of the oligomers formed during the early time of the aggregation process. The techniques used are mainly (1) quartz crystal microbalance (QCM) and atomic force microscopy (AFM) to study the elongation step of amyloid fibril formation and (2) dynamic light scattering (DLS) to study the evolution of the different populations formed during the aggregation time course. The results of these experiments indicate that the native conformation of BlaP197(Gln)55 interferes mainly with the nucleation but not with the elongation step of amyloid fibril formation. Moreover, these results demonstrate that the sequences flanking the polyQ tract significantly influence its propensity to elongate amyloid fibrils. Finally, they clearly indicate that the oligomers of BlaP197(Gln)79 observed at the early stage of the aggregation process are on the pathway of amyloid fibril formation, and likely constitute the aggregation nucleus. [less ▲]

Detailed reference viewed: 3 (1 ULg)
Peer Reviewed
See detailGender Role Orientation, Emotional Intelligence and Anxiety Symptoms in Children
Stassart, Céline ULg; Dardenne, Benoît ULg; Etienne, Anne-Marie ULg

Poster (2013, April 18)

According to Gender Role Theory, girls and boys learn to develop interests and attitudes consistent with their gender, resulting in behaviors and characteristics known as “masculine” and “feminine” ... [more ▼]

According to Gender Role Theory, girls and boys learn to develop interests and attitudes consistent with their gender, resulting in behaviors and characteristics known as “masculine” and “feminine” (Golombok & Fivush, 1994). Several authors have claimed that gender role, more than sex (male vs. female), explains the higher prevalence of anxiety in girls than in boys (e.g., Palapattu, Kingery, & Ginsburg, 2006). The expression of fear and anxiety is accepted and even encouraged among girls but is inconsistent with the masculine gender role: Boys are expected to face their fears and use adaptive behavior to handle the situation (Bem, 1981). Although the link between anxiety and gender role is well known for adults, empirical evidence concerning children is much scarcer (Palapattu et al., 2006). In this study, we first examine the importance of gender role in children’s anxiety. We also investigate the influence of a possible moderator in the relation between anxiety and gender role: emotional intelligence (EI). EI has been shown to protect against the development of anxiety in children (Williams, Daley, Burnside, & Hammond-Rowley, 2010). Our sample included 200 Belgian children (105 girls) aged 9 to 13 years old. The questionnaires used were the State-Trait Anxiety Inventory for Children (STAIC; Spielberger, 1973), the Trait Emotional Intelligence Questionnaire Child Form (TEIQue-CSF; Mavrovelli & Petrides, 2008), and the Children’s Personal Attributes Questionnaire (CPAQ; Hall & Halberstadt, 1980). The latter questionnaire is composed of three subscales: Masculinity (M, male-stereotyped traits but socially desirable in both sexes, e.g., leadership), Femininity (F, female-stereotyped traits but socially desirable in both sexes, e.g., kindness), Masculinity-Femininity (M-F, traits socially more acceptable for one sex or the other, e.g., emotional vulnerability for females and aggressiveness for males). High scores on the M-F scale indicate tendencies toward masculinity. Hierarchical multiple regression analyses were conducted to investigate the effect of gender role on the STAIC score beyond biological sex and EI as a moderator in relations between gender role and anxiety. Results indicated that gender role explains the anxiety score better than biological sex. Also, EI and the interaction between EI and M-F scores (TEIQue-CSF*M-F) were significant predictors of anxiety score. The children with low M-F scores and low EI had significantly higher levels of anxiety, while those with high M-F scores and high EI had the lowest levels of anxiety. These findings reveal not only the effect of gender role in the development of anxiety, but also the moderating effect of EI. [less ▲]

Detailed reference viewed: 53 (2 ULg)
Full Text
See detailMicroorganisms living on algae : An interesting reservoir of enzymes hydrolyzing algal biomass
Martin, Marjolaine ULg; Biver, Sophie ULg; Barbeyron, Tristan et al

Poster (2013, April 18)

Algal polysaccharides are increasingly used in food industry for their gelling properties and in pharmacology for their therapeutic properties. Furthermore, increasingly interest is taken on algae for ... [more ▼]

Algal polysaccharides are increasingly used in food industry for their gelling properties and in pharmacology for their therapeutic properties. Furthermore, increasingly interest is taken on algae for their use in the production of biofuels and bioenergies. To purify algal polysaccharides and degrade algal biomass, specific microbial enzymes are needed. Microorganisms living on algae are an interesting source of those enzymes, as they are in constant interaction with algal biomass. The aim of our study is to identify new enzymes degrading algae, produced by microorganisms living on the surface of algae. Therefore we developed a method for microbial DNA extraction from biofilms living on brown algae (Ascophyllum nodosum). Microbial DNA was extracted, restricted and inserted in cultivable host cells of Echerichia coli, for the construction of our metagenomic DNA library. This metagenomic library was first screened, on solid media with specific substrates, for enzymes generally used in the degradation of biomass (lipases, cellulases, proteases, beta-glucosidases, alpha-amylases, arabinanases and xylanases). Five lipolytic enzymes, one beta-glucosidase and one cellulase were identified. Those enzymes show very low percentages of sequences identities with known enzymes, meaning we identified new and unknown enzymes. Those enzymes and their activity are being characterized. Preliminary tests show interesting results, like a cellulase active at low temperature. Screening tests are now being developed to identify enzymes hydrolyzing algal polysaccharides like agarases, carrageenases, alginate lyases, laminarinases,… Those enzymes aren’t well known yet and we hope to identify new enzymes (families) with our rich DNA library by our approach. [less ▲]

Detailed reference viewed: 14 (2 ULg)
Full Text
Peer Reviewed
See detailHydrocarbons contamination of smoked shrimp, an expanding food condiment in Beninese local markets
Kpoclou, Euloge; Brose, François ULg; Anihouvi, V.B. et al

Poster (2013, April 18)

Detailed reference viewed: 16 (6 ULg)
Peer Reviewed
See detailStudy of the toxicity of migration products from food contact materials for children under 3 years old
Simon, Coraline ULg; Oghena, M.; Covaci, A. et al

Poster (2013, April 18)

Detailed reference viewed: 17 (0 ULg)
Full Text
See detailStudy of a solar concentrator for space based on a diffractive/refractive optical combination
Michel, Céline ULg; Loicq, Jerôme ULg; Mazzoli, Alexandra ULg et al

Poster (2013, April 16)

This paper presents a new design of a planar solar concentrator for space applications focusing on two spatially separated PV cells, allowing independent control of output power of each cell. It has the ... [more ▼]

This paper presents a new design of a planar solar concentrator for space applications focusing on two spatially separated PV cells, allowing independent control of output power of each cell. It has the advantages of both spectral splitting and solar concentration by the combination of a blaze transmission diffraction grating and a flat cylindrical Fresnel lens. An optical optimization has been realized and two variations of configuration have been developed to improve tracking tolerance: first, a design completed by secondary reflective concentrators and second, a symmetrical configuration composed of two lenses. First numerical results are presented, highlighting the possibility to design a concentrator at about 10×, with an electrical output power about 290W/m² lens and less than 10% losses for tracking errors lower than ±0.9°. [less ▲]

Detailed reference viewed: 25 (8 ULg)
Full Text
See detailEmulation of the MBM-MEDUSA model: exploring the sea level and the basin-to-shelf transfer influence on the system dynamics
Ermakov, Ilya; Munhoven, Guy ULg; Crucifix, Michel

Poster (2013, April 12)

Complex climate models require high computational burden. However, computational limitations may be avoided by using emulators. In this work we present several approaches for dynamical emulation (also ... [more ▼]

Complex climate models require high computational burden. However, computational limitations may be avoided by using emulators. In this work we present several approaches for dynamical emulation (also called metamodelling) of the Multi-Box Model (MBM) coupled to the Model of Early Diagenesis in the Upper Sediment A (MEDUSA) that simulates the carbon cycle of the ocean and atmosphere [1]. We consider two experiments performed on the MBM-MEDUSA that explore the Basin-to-Shelf Transfer (BST) dynamics. In both experiments the sea level is varied according to a paleo sea level reconstruction. Such experiments are interesting because the BST is an important cause of the CO2 variation and the dynamics is potentially nonlinear. The output that we are interested in is the variation of the carbon dioxide partial pressure in the atmosphere over the Pleistocene. The first experiment considers that the BST is fixed constant during the simulation. In the second experiment the BST is interactively adjusted according to the sea level, since the sea level is the primary control of the growth and decay of coral reefs and other shelf carbon reservoirs. The main aim of the present contribution is to create a metamodel of the MBM-MEDUSA using the Dynamic Emulation Modelling methodology [2] and compare the results obtained using linear and non-linear methods. The first step in the emulation methodology used in this work is to identify the structure of the metamodel. In order to select an optimal approach for emulation we compare the results of identification obtained by the simple linear and more complex nonlinear models. In order to identify the metamodel in the first experiment the simple linear regression and the least-squares method is sufficient to obtain a 99,9% fit between the temporal outputs of the model and the metamodel. For the second experiment the MBM’s output is highly nonlinear. In this case we apply nonlinear models, such as, NARX, Hammerstein model, and an ’ad-hoc’ switching model. After the identification we perform the parameter mapping using spline interpolation and validate the emulator on a new set of parameters. [less ▲]

Detailed reference viewed: 13 (0 ULg)
See detailValidation of the Structural-Thermal-Model of the Small Earth Observation Satellite Flying Laptop
Steinmetz, Fabian; Lengowski, Michael; Winter, Daniel et al

Poster (2013, April 10)

Thorough thermal design and testing is compulsory for every satellite mission. A well-known thermal behavior of the entire satellite system is therefore indispensable and needs to be verified during the ... [more ▼]

Thorough thermal design and testing is compulsory for every satellite mission. A well-known thermal behavior of the entire satellite system is therefore indispensable and needs to be verified during the spacecraft development. A Structural-Thermal-Model (STM) was constructed for the Flying Laptop, a satellite currently being developed at the Institute of Space Systems (IRS) of the University of Stuttgart, which enables the validation of mechanical and thermal simulations for the satellite’s Flight-Model. The STM was vibration and thermal-vacuum tested at the Centre Spatial Liège (CSL). This paper will de-scribe the design and construction of the STM as well as the facilities and test equipment used for the tests. Conclusions will be drawn from the actual test results. [less ▲]

Detailed reference viewed: 50 (10 ULg)
Full Text
See detailEvolution of methanol (CH3OH) above the Jungfraujoch station (46.5°N) : Variability, seasonal modulation and long-term trend.
Bader, Whitney ULg; Mahieu, Emmanuel ULg; Lejeune, Bernard ULg et al

Poster (2013, April 09)

Methanol (CH3OH) is the second most abundant organic compound in the Earth’s atmosphere with concentrations close to a few ppbv, after methane, despite a short lifetime of a few days (Jacob et al., 2005 ... [more ▼]

Methanol (CH3OH) is the second most abundant organic compound in the Earth’s atmosphere with concentrations close to a few ppbv, after methane, despite a short lifetime of a few days (Jacob et al., 2005). Natural sources of CH3OH include plant growth, oceans, decomposition of plant matter, oxidation of methane and other VOCs,. . . while anthropogenic sources are from vehicles, industry,. . . biomass burning completes the emission budget. The main sink is the oxidation by hydroxyl radical, leading to the formation of carbon monoxide (CO) and formaldehyde (H2CO). The retrieval of methanol is very challenging due to the presence of strong absorption of ozone and its isotopologues in addition to water vapour and carbon dioxide in the region of the selected strong nu8 band of CH3OH. First retrievals from satellite observations using the Atmospheric Chemistry Experiment infrared Fourier Transform Spectrometer (ACE-FTS) on board the SCISAT satellite have been performed by Dufour et al. (2007 and references therein) using a spectral interval going from 995.5 to 1008.3 cm-1. In 2009, first retrievals from a ground-based FTS, using spectra recorded at Kitt Peak (31.9°N) and a window going from 992 to 999 cm-1 have been reported by Rinsland et al. (2009), followed by Vigouroux et al. (2012 and references therein) who used yet another spectral interval going from 1029 to 1037cm-1. From those former retrieval strategies and also considering the Mahieu et al. (2012) contribution, we redefined our spectral intervals to maximize the information content. Indeed, our first window, starting from 992 to 1008.3 cm-1, is issued from the merge of Rinsland et al. and Dufour et al. windows while our second, going from 1029 to 1037 cm-1, is the one used by Vigouroux et al.With this new combination of windows, we were able to enlarge the range of zenith angles providing robust results while maintaining good correlation between our two windows; this also resulted in an improvement of the fitting residuals and of the information content. We used the 2008 HITRAN compilation (Rothman et al., 2009) for spectroscopic parameters. However, systematic residuals still remain in the 1033 cm-1 region which are attributed to unsatisfactory line parameters for methanol. New cross sections recorded at the Molecular Spectroscopy Facility of the Rutherford Appleton Laboratory (Harrison et al. 2012) and calibrated in intensity by using the reference spectra from the Pacific Northwest National Laboratory (PNNL) IR database will be tested as soon as converted into pseudolines. In this work, we will present the first long-term time series of methanol total columns, resulting from the implementation of our new retrieval strategy. All retrievals have been performed with the SFIT2 algorithm (v 3.91) (Rinsland et al., 1998) using a series of about 7 000 spectra recorded between 1995 and 2012, with zenith angles between 60 and 85°. These solar absorption observations have been recorded with a high-resolution FTIR Bruker 120HR instrument, at the high altitude station of the Jungfraujoch (46.5°N, 8°E, 3580 m asl), within the framework of the Network for the Detection of Atmospheric Composition Change (NDACC, visit http://www.ndacc.org). [less ▲]

Detailed reference viewed: 58 (21 ULg)
Full Text
See detailImpact of grazing on carbon balance of an intensively grazed grassland in Belgium
Jerome, Elisabeth ULg; Beckers, Yves ULg; Beekkerk van Ruth, Jöran ULg et al

Poster (2013, April 09)

This work analyzes the impact of grazing on the carbon balance of a grassland grazed by the Belgian Blue breed of cattle. The research was run at the Dorinne terrestrial observatory (DTO). The ... [more ▼]

This work analyzes the impact of grazing on the carbon balance of a grassland grazed by the Belgian Blue breed of cattle. The research was run at the Dorinne terrestrial observatory (DTO). The experimental site is a permanent grassland of ca. 4.2 ha located in the Belgian Condroz (50° 18’ 44’’ N; 4° 58’ 07’’ E; 248 m asl.). Other studies are conducted at the DTO including measurements of methane (CH4) and nitrous oxide fluxes (Dumortier et al., Geophysical Research Abstracts, Vol. 15, EGU2013-2083-1, 2013; Beekkerk van Ruth et al., Geophysical Research Abstracts, Vol. 15, EGU2013-3211, 2013, respectively). Grassland carbon budget (Net Biome Productivity, NBP) was calculated from Net Ecosystem Exchange (NEE) measured by eddy covariance by taking imports and exports of organic C and losses of carbon as CH4 into account (Soussana et al., 2010). After 2 years of measurements (May 2010 - May 2012), the grassland behaved on average as a CO2 source (NEE = 73 ±31 g C m-2 y-1). After inclusion of all the C inputs and outputs the site was closed to equilibrium (NBP = 23 ±34 g C m-2 y-1). To analyze the impact of grazing on CO2 fluxes, we studied the temporal evolution of gross maximal photosynthetic capacity GPPmax and dark respiration Rd (deduced from the response of daytime fluxes to radiation over 5-day windows). We calculated GPPmax and Rd variation between the end and the beginning of grazing or non-grazing periods (∆GPPmax and ∆Rd, respectively). We observed a significant decrease of GPPmax during grazing periods and measured a ∆GPPmax dependence on the average stocking rate. This allows us to quantify the assimilation reduction due to grass consumption by cattle. On the contrary, no Rd decrease was observed during grazing periods. Moreover, we found that cumulated monthly NEE increased significantly with the average stocking rate. In addition, a confinement experiment was carried out in order to analyze livestock contribution to Total Ecosystem Respiration. Each experiment extended over two days: the first day, cattle was confined in the footprint of the eddy covariance set-up (1.76 ha, 27 LU ha-1) and the second day, it was removed from it. We compared filtered half-hourly data made at 24h intervals, in the presence or absence of cattle, considering that environmental conditions were equivalent (air temperature, wind speed, radiation and wind direction). Results showed that CO2 fluxes were significantly higher when cattle were on the plot. Livestock contribution estimation to CO2 fluxes was on average 6.6 µmol m-2 s-1. [less ▲]

Detailed reference viewed: 65 (12 ULg)
Full Text
See detailModeling soil respiration in wheat fields
Delogu, Emilie; Le Dantec, Valérie; Mordelet, Patrick et al

Poster (2013, April 09)

Detailed reference viewed: 33 (0 ULg)
Full Text
See detailTemporal variability of nitrous oxide fluxes from a fertilized grassland in Belgium: preliminary results from dynamic closed chambers.
Beekkerk van Ruth, Jöran ULg; Moureaux, Christine ULg; Degré, Aurore ULg et al

Poster (2013, April 09)

Presentation of preliminary results from N2O measurements over a grassland using dynamic closed chambers. See attached folders for more detail.

Detailed reference viewed: 15 (4 ULg)
Full Text
See detailSoil respiration partitioning and its components in the total agro-ecosystem respiration
Delogu, Emilie; Le Dantec, Valérie; Mordelet, Patrick et al

Poster (2013, April 09)

Detailed reference viewed: 8 (0 ULg)
Full Text
See detailTEMPORAL VARIABILITY OF N2O FLUXES FROM A FERTILIZED GRASSLAND: PRELIMINARY RESULTS FROM DYNAMIC CLOSED CHAMBERS
Beekkerk van Ruth, Jöran ULg; Moureaux, Christine ULg; Degré, Aurore ULg et al

Poster (2013, April 09)

This work presents preliminary results of nitrous oxide (N2O) fluxes measured by dynamic closed chambers from a fertilized grassland grazed by the Belgian Blue breed of cattle. It is part of a project ... [more ▼]

This work presents preliminary results of nitrous oxide (N2O) fluxes measured by dynamic closed chambers from a fertilized grassland grazed by the Belgian Blue breed of cattle. It is part of a project funded by the public service of Wallonia (SPW-DGARNE), whose objectives are to make a carbon/CO2 balance of the grassland (Jérôme et al., 2013) and to quantify CH4 (Dumortier et al., 2013) and N2O fluxes. The site is located in Dorinne (Dorinne Terrestrial Observatory), Belgium (50° 18’ 44” N; 4° 58’ 07” E; 248 m al.). It is a permanent grassland of ca. 4.2 ha with a moderate slope of 1 to 2 %. Mineral fertilisation took place in March and May 2012. Two cylindrical chambers of 19,2 cm diameter and 11,5 cm height were placed inside a protected area around a micrometeorological station. An infrared gas analyser (Thermofischer 46i) was used in order to measure the N2O concentrations inside of the chambers, closed by automatically controlled lids and ventilated by a constant air flow of 1liter/min. These devices were completed by adjacent soil humidity and temperature sensors. The first measurement campaign took place during June and July 2012. The chambers were installed in the field and N2O fluxes were followed without manipulation. N2O fluxes were characterised by a background emission (between 2 and 10 ngN.m2s􀀀1) on which intense but time limited peaks (between 50 and 300 ngN.m2s􀀀1) superimposed. Peaks were found to be mainly linked to fertilisation and driven by precipitation. Background fluxes were found to correlate positively with soil temperature. Secondly, a manipulation experiment took place in November 2012: two different fertilizer treatments were applied to the chambers. Doses of respectively 100 and 200 kg N/ha of ammonium nitrate were sprayed in the chambers (equivalent to a 8mmprecipitation). N2O fluxes peaked shortly after fertiliser application (respectively 300 and 550 ngN.m2s􀀀1), as well as after a posterior rain event (respectively 800 and 1500 ngN.m2s􀀀1). The peak dynamics suggests a complex interaction between soil humidity and nitrogen availability, which is under study. Dumortier et al., Geophysical Research Abstracts, Vol. 15, EGU2013-2083-1, 2013 Jérôme et al., Geophysical Research Abstracts Vol. 15, EGU2013-6989, 2013 [less ▲]

Detailed reference viewed: 79 (9 ULg)
Peer Reviewed
See detailDeciphering human-climate interactions in ombrotrophic peat record : REE, Nd and Pb isotope signatures of dust supplies over the last 2500 years (Misten bog, Belgium)
Fagel, Nathalie ULg; Allan, Mouhamd ULg; le roux, Gael et al

Poster (2013, April 08)

A core of 173 cm of ombrotrophic Misten peat bog from the Hautes-Fagnes Plateau in Eastern Belgium provides a record of Rare Earth Elements (REE) deposition allowing to trace dust fluxes in West Europe ... [more ▼]

A core of 173 cm of ombrotrophic Misten peat bog from the Hautes-Fagnes Plateau in Eastern Belgium provides a record of Rare Earth Elements (REE) deposition allowing to trace dust fluxes in West Europe during the historical record (last 2500 years). REE and lithogenic element analyses, as well as the Nd isotopes, were performed by HR-ICP-MS and MC-ICP-MS, respectively in peat layers dated by 210Pb and 14C. The parallel variations of REE concentration with lithogenic conservative elements confirms that REE are immobile in the studied peat bog and can be used as tracers of dust deposition. Dust fluxes show pronounced increase at BC300, AD600, 1000AD,1200AD and from 1700AD, recording either influence of human activities (regional erosion due to forest clearing and soil cultivation activities) or local and regional climate changes. Using Nd isotope allows to decipher between local and distal causes. The ENd variability (-13 to -9) is interpreted by a mixing between dust sources fromlocal soils and desert particles. Three periods characterised by dominant-distal sources (at 320AD, 1000 AD and 1700AD) are consistent with local wetter intervals as indicated by lower humi[U+FB01]cation degree. Local erosion prevails durier drier (higher humification) intervals (-100AD, 600AD). On a global scale more distal supplies are driven during colder periods, in particular Oort and Maunder minima. Combining geochemical elementary content and isotope data in ombrotrophic peat allows to decipher between dust flux changes related to human and climate forcing. [less ▲]

Detailed reference viewed: 38 (5 ULg)
Full Text
Peer Reviewed
See detailAmphiphilic structure-surface property relationships of monosaccharide-based surfactants
Razafindralambo, Hary ULg; Nicks, Francois ULg; Richard, Gaetan ULg et al

Poster (2013, April 08)

A set of monosaccharide-based renewable surfactants has been prepared, structurally checked, and systematically screened for different activities and functionalities. These compounds vary in the polar ... [more ▼]

A set of monosaccharide-based renewable surfactants has been prepared, structurally checked, and systematically screened for different activities and functionalities. These compounds vary in the polar head group, linker, and hydrophobic tail. Beyond the goal to find out the most potential valuable surfactants for each measurement, relationships between chemical structure, basic properties, and functionalities have been examined by comparing compounds differing in a single structural variable. In this paper, we show and explain the impact of the anomeric alpha or bêta, neutral or acid sugar derivatives, equatorial or axial position of hydroxyl group, alkyl chain substitute attachment position, number, and length on surface properties of sugar-based surfactants. [less ▲]

Detailed reference viewed: 70 (28 ULg)
Full Text
See detailVariability of North Sea pH and CO2 pumping in response to North Atlantic Oscillation forcing
Salt, L; Thomas, H; Prowe, F et al

Poster (2013, April 07)

Detailed reference viewed: 29 (0 ULg)
Full Text
See detailFrom a source to a sink: the role of biological activities on atmospheric CO2 exchange along the river-ocean continuum
Gypens, N; Passy, P; Lancelot, C et al

Poster (2013, April 07)

Detailed reference viewed: 28 (0 ULg)
Full Text
See detailThe influence of biogeochemical processes on the pH dynamics in the seasonally hypoxic saline Lake Grevelingen
Hagens, M; Slomp, C; Meysman, F et al

Poster (2013, April 07)

Detailed reference viewed: 38 (0 ULg)
Peer Reviewed
See detailDynamic of seed dispersal by large frugivores in a forest-savanna mosaic subject to anthropic pressure in Western D.R. Congo
Trolliet, Franck ULg; Serckx, Adeline; Huynen, Marie-Claude ULg et al

Poster (2013, April 05)

The Western Congolian forest-savanna mosaic is an ecotone subject to anthropogenic as well as natural fragmentation. Its forests have thus a considerable proportion of edges. This vegetation structure is ... [more ▼]

The Western Congolian forest-savanna mosaic is an ecotone subject to anthropogenic as well as natural fragmentation. Its forests have thus a considerable proportion of edges. This vegetation structure is likely to impact animal and plant communities and its dynamics such as animal mediated seed dispersal. Synergetically, activities such as bush meat hunting deplete large frugivores populations and thus decrease recruitment potential of the plants they disperse. Indeed, zoochory is known to be of great importance for tropical forests and a number of studies proved that large-seeded tree species closely depend on large frugivores for their regeneration. In such a context, we aim to understand how forest edges affect the dynamics of seed dispersal. More precisely, we wonder if the interactions between large seeds and their dispersers and predators are affected when closer to edges and how this can impact plant regeneration capacity. Also, we wonder if the dispersal and regeneration of large-seeded tree species depend on a few disproportionally important frugivores species. Bonobos, Pan paniscus, are among the largest frugivores left in the area and thus likely to be disproportionally important seed dispersers, though, their role as seed dispersers has yet been little investigated. We thus focus on the qualitative role for seed dispersal of the potentially keystone and umbrella ape species, the bonobo. To answer those questions, we study the main steps characteristics of large-seeded tree species regeneration process; namely quantitative seed dispersal, seed deposition pattern, germination capacity after transit in frugivore’s gut and, seed and seedling fate. By studying five different tree species at varying distances from forest edge, we aim to drive an inter-species comparison and to highlight the effect of forest edge on the regeneration process. We first quantify the seed production for each tree species and then evaluate the quantitative capacity of seed dispersal. By combining direct focal observations and camera trapping, we are able to highlight variations in composition of dispersers community and their respective contribution to seed dispersal. A literature review on each disperser species’ seed retention time and habitat use will allow the computation of the seed dispersal kernels. We will also evaluate the effect of seed ingestion by the bonobo on its germination capacity: seeds will be collected from dung to evaluate the effect of seed ingestion on the rate and velocity of germination. Finally, we will study the predation pressure exerted on dispersed and non-dispersed seeds and seedlings by setting up two sets of seeds below the canopy of parent trees and away from any conspecific trees. One set will be dispersed unprotected to seed predators; another one will be enclosed in a cage and permit seeds to germinate, allowing us to evaluate the herbivores pressure on seedlings. [less ▲]

Detailed reference viewed: 65 (18 ULg)
Full Text
Peer Reviewed
See detailResearch on durable junction of multimaterials
Lecomte-Beckers, Jacqueline ULg; Lecomte, Jacky; Gerlach, Nathalie ULg et al

Poster (2013, April 04)

This collective project aimed to assess the potential of adhesive bonding in various applications in the field of building construction. This evaluation takes into account technical, economical and ... [more ▼]

This collective project aimed to assess the potential of adhesive bonding in various applications in the field of building construction. This evaluation takes into account technical, economical and ecological aspects and provides a methodology that can be easily transferred to other applications. [less ▲]

Detailed reference viewed: 34 (12 ULg)
Peer Reviewed
See detailA multiscale model of the influence of oxygen during bone fracture healing.
Carlier, Aurélie ULg; Geris, Liesbet ULg; Van Oosterwyck, Hans

Poster (2013, April 03)

Detailed reference viewed: 17 (0 ULg)
Full Text
Peer Reviewed
See detailAnalytical evaluation of virgin olive oils produced from three varieties Koroneiki , Arbequina and Arbosana grown in east of Morocco
Mansouri, F.; Ben Moumen, A.; Lopez, G. et al

Poster (2013, April)

Detailed reference viewed: 31 (5 ULg)
Full Text
See detailOzone tropospheric and stratospheric trends (1995-2012) at six ground-based FTIR stations (28°N to 79°N)
Vigouroux, Corinne; De Mazière, Martine; Demoulin, Philippe ULg et al

Poster (2013, April)

In the frame of the Network for the Detection of Atmospheric Composition Change (NDACC), contributing ground-based stations have joined their efforts to homogenize and optimize the retrievals of ozone ... [more ▼]

In the frame of the Network for the Detection of Atmospheric Composition Change (NDACC), contributing ground-based stations have joined their efforts to homogenize and optimize the retrievals of ozone profiles from FTIR (Fourier transform infrared) solar absorption spectra. Using the optimal estimation method, distinct vertical information can be obtained in four layers: ground-10 km, 10-18 km, 18-27 km, and 27-42 km, in addition to total column amounts. In a previous study, Vigouroux et al. (2008) applied a bootstrap resampling method to determine the trends of the ozone total and four partial columns, over the period 1995-2004 at Western European stations. The updated trends for the period 1995-2009 have been published in the WMO 2010 report. Here, we present the updated trends and their uncertainties, for the 1995-2012 period, for the different altitude ranges, above five European stations (28°N-79°N) and above the station Thule, Greenland (77°N). In this work, the trends have been estimated using a multiple regression model including some explanatory variables responsible for the ozone variability, such as the Quasi Biennial Oscillation (QBO), the solar flux, the Arctic Oscillation (AO) or El Niño-Southern Oscillation (ENSO). A major result is the significant positive trend of ozone in the upper stratosphere, observed at the Jungfraujoch (47°N), which is a typical mid-latitude site, as well as at the high latitude stations. This positive trend in the upper stratosphere at Jungfraujoch provides a sign of ozone recovery at mid-latitudes. [less ▲]

Detailed reference viewed: 12 (0 ULg)
Full Text
See detailTesting palaeoclimate and palaeovegetation model reconstructions with palaeovegetation data : an application to the Middle Miocene
François, Louis ULg; Utescher, Torsten; Hamon, Noémie et al

Poster (2013, April)

Detailed reference viewed: 19 (5 ULg)
Full Text
Peer Reviewed
See detailComparative study of four safflower oils (Carthamus tinctorius) varieties grown in eastern of Morocco
Ben Moumen, A.; Mansouri, F.; Zraibi, L. et al

Poster (2013, April)

Safflower (Carthamus tinctorius) is an oilseed crop, which, for many years, has been grown on a relatively small scale in parts of North Africa and Middle East (Purdy and al., 1959).

Detailed reference viewed: 84 (7 ULg)
Full Text
Peer Reviewed
See detailThermal adaptation of the ribosomal chaperone trigger factor
Godin, Amandine ULg

Poster (2013, April)

Detailed reference viewed: 3 (0 ULg)
Full Text
Peer Reviewed
See detailInformal caregiver involvement in innovative home care projects in Belgium
Lopez Hartmann; Van Durme, Thérèse; Maggi, Patrick ULg et al

Poster (2013, April)

Detailed reference viewed: 3 (1 ULg)
Peer Reviewed
See detailEstimating Antarctic ice sheet surface mass balance contribution to future sea level rise using the regional atmospheric climate model MAR
Agosta, Cécile ULg; Fettweis, Xavier ULg; Gallée, Hubert

Poster (2013, April)

We report future projections of Surface Mass Balance (SMB) over the Antarctic ice sheet obtained with the regional climate model MAR, for different warming scenarios. MAR forcing is carefully selected ... [more ▼]

We report future projections of Surface Mass Balance (SMB) over the Antarctic ice sheet obtained with the regional climate model MAR, for different warming scenarios. MAR forcing is carefully selected among the CMIP5 GCMs panel according to its ability to simulate the current climate over Antarctica. MAR includes blowing snow modeling, an important process in Antarctica. [less ▲]

Detailed reference viewed: 34 (3 ULg)
Full Text
Peer Reviewed
See detailÉtude de la virulence des sérotypes 4 et 9 du virus de la peste équine dans deux modèles murins
De la Grandière de Noronha Cotta, Maria Ana ULg; Zonta, William ULg; Dal Pozzo, Fabiana ULg et al

Poster (2013, April)

Objectifs Le virus de la peste équine (African horse sickness virus ; AHSV) est un virus segmenté à ARN double brin, appartenant à la famille des Reoviridae et au genre Orbivirus. L’AHSV se différencie en ... [more ▼]

Objectifs Le virus de la peste équine (African horse sickness virus ; AHSV) est un virus segmenté à ARN double brin, appartenant à la famille des Reoviridae et au genre Orbivirus. L’AHSV se différencie en 9 sérotypes distincts et est transmis par la piqûre d’un vecteur, principalement Culicoides imicola. L’AHSV cause une sévère morbidité et un taux de mortalité qui peut atteindre 95 % chez les chevaux avec de lourdes conséquences économiques. L’établissement d’un modèle d’étude en souris est nécessaire pour plusieurs applications, comme l’investigation de la pathogénie de ce virus, l’étude de la virulence, l’étude d’efficacité de nouveaux vaccins. Méthodes Deux modèles murins, soit une lignée de souris déficientes en récepteur à l’interféron α (A129 KO ou IFNAR -/-), et une lignée immunocompétente (A 129 WT) ont été testées. Les virus de sérotypes 4 et 9 de l’AHSV ont été utilisés pour les inoculations des souris ; ces deux sérotypes ont été à l’origine des épidémies observées en Espagne en 1969 et à la fin des années 80 en Espagne et au Portugal. Le virus a été inoculé par voie sous-cutanée (SC) et/ou par voie intra-nasale (IN) et un groupe de souris témoin (mock-infected) a été utilisé pour les deux modèles testés. Des échantillons de sang ont été prélevés de chaque souris infectée et témoin à intervalles réguliers. Les organes (foie, rate, reins, poumon et cerveau) ont été prélevés à la fin de l’expérience pour la plupart des souris ou lors de l’euthanasie des souris qui présentaient des signes cliniques très prononcés. Tous les échantillons, sang et organes, ont été analysés par qRT-PCR avec comme cible le segment 7 codant la protéine VP7 de l’AHSV qui est la protéine de structure la plus conservée entre les différents sérotypes. Résultats Les deux sérotypes de l’AHSV ont été détectés par qRT-PCR jusqu’à 3 semaines post-infection (ce qui correspond à la fin de l’expérience) dans le sang des souris IFNAR -/- et A129 WT infectées par la voie SC. Le virus de sérotype 4 atteint des niveaux de virémie légèrement plus élevés par rapport au virus de sérotype 9. Les souris A129 WT infectées par la voie intra-nasale ne montrent à aucun moment de l’expérience de virémie détectable par la qRT-PCR. Le pic de virémie a été mesuré entre le jour 2 et le jour 4 post-infection pour les deux lignées de souris. Au pic de virémie, la quantité de ADNc correspondant au segment-7 viral, après quantification par qRT-PCR, était plus élevée chez les souris IFNAR -/-. Conclusions Les souris immunodéficientes (IFNAR -/-) présentent des caractéristiques cliniques et biologiques permettant l’établissement d’un modèle in vivo pertinent. Selon les premiers résultats obtenus, il semble que la voie sous-cutanée soit la voie à privilégier pour les expériences in vivo futures. La mise au point de ce modèle sur souris permet de disposer d’un outil efficace et nécessaire pour l’étude in vivo de l’AHSV, afin de caractériser in vivo la virulence de ce virus et de suivre l’évolution des populations virales pendant la multiplication virale in vivo. Remerciements Recherche financée par le service Recherche Contractuelle, Service Public Fédérale, Santé Publique, Sécurité de la Chaîne alimentaire et Environnement (RT 12/6262 INDEVIREQ 2.0) [less ▲]

Detailed reference viewed: 32 (12 ULg)
Full Text
See detailRelation entre composition floristique et accumulation de biomasse dans deux types de forêts de la Réserve de Biosphère du Dja (Cameroun)
Djuikouo, Marie Noel K.; Doucet, Jean-Louis ULg; Nguembou, Charlemagne K. et al

Poster (2013, April)

Detailed reference viewed: 30 (5 ULg)
Peer Reviewed
See detailHigh-resolution modelling of the Antarctic surface mass balance, application for the 20th, 21st and 22nd centuries
Agosta, Cécile ULg; Favier, Vincent; Krinner, Gerhard et al

Poster (2013, April)

Although areas below 2000 m above sea level (a.s.l.) cover 40% of the Antarctic grounded ice-sheet, they represent about 75% of the surface mass balance (SMB) of the continent. Because the topography is ... [more ▼]

Although areas below 2000 m above sea level (a.s.l.) cover 40% of the Antarctic grounded ice-sheet, they represent about 75% of the surface mass balance (SMB) of the continent. Because the topography is complex in many of these regions, SMB modelling is highly dependent on resolution, and studying the impact of Antarctica on the fu- ture rise in sea level requires high resolution physical approaches. We have developed a new, low time consuming, physical downscaling model for high-resolution (15 km) long-term SMB projections. Here, we present results of our SMHiL (surface mass balance high-resolution downscaling) model, which was forced with the LMDZ4 atmo- spheric general circulation model to assess SMB variation in the 21st and the 22nd centuries under two different scenarios. The higher resolution of SMHiL reproduces the geographical patterns of SMB better and induces a significantly higher averaged SMB over the grounded ice-sheet for the end of the 20th century. Our comparison of more than 2700 quality-controlled field data showed that LMDZ4 and SMHiL fit the observed values equally well. Never- theless, field data below 2000 m a.s.l. are too scarce to settle SMHiL efficiency. Measuring the SMB in these undocumented areas is a future scientific priority. Our results suggest that running LMDZ4 at a finer resolution may give a future increase in SMB in Antarctica between 15% to 30% higher than its standard resolution. Future changes in the Antarctic SMB at low elevations will result from the conflict between higher snow accumulation and runoff. For this reason, developing a downscaling model was crucial to represent processes in sufficient detail and correctly model the SMB in coastal areas. [less ▲]

Detailed reference viewed: 31 (4 ULg)
Full Text
See detailExtensions of Superalgebras of Krichever-Novikov type
Kreusch, Marie ULg

Poster (2013, April)

An explicit construction of central extensions of Lie superalgebras of Krichever-Novikov type is given. In the case of Jordan superalgebras related to the superalgebras of Krichever-Novikov type we ... [more ▼]

An explicit construction of central extensions of Lie superalgebras of Krichever-Novikov type is given. In the case of Jordan superalgebras related to the superalgebras of Krichever-Novikov type we calculate a 1-cocycle with coefficients in the dual space. [less ▲]

Detailed reference viewed: 38 (14 ULg)
Peer Reviewed
See detailStables isotopes in the fin whale Balaenoptera physalus from the Mediterranean Sea: implications for management and conservation
Das, Krishna ULg; Lepoint, Gilles ULg; Michel, Loïc ULg et al

Poster (2013, April)

The fin whale (Balaenoptera physalus) is the commonest large whale species in the Mediterranean Sea, found mostly over deep, offshore waters of the western and central portion of the region. This whale is ... [more ▼]

The fin whale (Balaenoptera physalus) is the commonest large whale species in the Mediterranean Sea, found mostly over deep, offshore waters of the western and central portion of the region. This whale is known to feed mainly on krill in contrast to its Atlantic counterpart, displaying a more diversified diet. δ13C and δ15N values were analysed by IR-MS (Isoprime 100) coupled to an N-C-S elemental analyser (Vario MICRO Cube, Elementar) in 113 skin biopsies from Mediterranean fin whales sampled in 2010 and 2011 during WWF campaign at sea. A lipid normalization equation was applied (adapted from Post al. 2007) because the measured C:N ratio was > 3.5. Normalized δ13C and δ15N values ranged from -20.3 to -17.3 ‰ and from 5.9 to 8.9 ‰, respectively. These values are in good agreement with those collected previously on baleen plates from Mediterranean fin whales (Bentaleb et al., 2011). A mean enrichment of 3.4 ‰ was observed between δ15N values measured in fin whale skin biopsies and Mediterranean krill (Meganyctiphanes norvegica) confirming the importance of the krill as a major food source. The narrow width of the isotopic niche of the Mediterranean fin whale (evaluated by SIBER Stable Isotope Bayesian Ellipses) compared to the Atlantic fin whale (Ryan et al. 2012) raises many concerns in the context of global changes and long-term consequences. One could expect that species displaying narrow niches would be more susceptible to ecosystem fragmentation and other anthropogenic impacts. [less ▲]

Detailed reference viewed: 127 (8 ULg)
Full Text
See detailThe multiple SEA method: a method to synthesize Pt/carbon xerogel catalysts for Proton Exchange Membrane Fuel Cells (PEMFC)
Zubiaur, Anthony ULg; Chatenet, Marian; Maillard, Frédéric et al

Poster (2013, April)

Detailed reference viewed: 10 (1 ULg)
See detailGlioblastoma metastases:case report and literature review
REUTER, Gilles ULg; Lombard, Arnaud ULg; SCHOLTES, Félix ULg et al

Poster (2013, March 30)

Detailed reference viewed: 33 (12 ULg)
Peer Reviewed
See detailPB15’s discrimination in oil paintings by non-destructive methods
Defeyt, Catherine ULg; Vandenabeele, Peter; Van Pevenage, Jolien et al

Poster (2013, March 29)

Detailed reference viewed: 12 (0 ULg)
Full Text
Peer Reviewed
See detailEffects of climate change on the river Meuse: Hydraulic 2D modeling from Amspin to Maaseik (and beyond)
Huismans, Ymkje; Dewals, Benjamin ULg; van der Mark, Rolien et al

Poster (2013, March 22)

Detailed reference viewed: 17 (6 ULg)
Full Text
See detailLaser Cooling of Iron Atoms
Huet, Nicolas ULg; Krins, Stéphanie ULg; Bastin, Thierry ULg

Poster (2013, March 21)

We report on the first laser cooling of Iron atoms. Our laser cooling setup makes use of 2 UV laser radiations sent colinearly in a 0.8 m Zeeman slower. One laser is meant for optical pumping of the Iron ... [more ▼]

We report on the first laser cooling of Iron atoms. Our laser cooling setup makes use of 2 UV laser radiations sent colinearly in a 0.8 m Zeeman slower. One laser is meant for optical pumping of the Iron atoms from the ground state to the lowest energy metastable state. The second laser cools down the atoms using a quasi-perfect closed transition from the optically pumped metastable state. The velocity distribution at the exit of the Zeeman slower is obtained from a probe laser crossing the atomic beam at an angle of 50 degrees. The fluorescence light is detected using a photomultiplier tube coupled with a boxcar analyzer. The Iron atom beam is produced with a commercial effusion cell working at around 1600°C. Our laser radiations are stabilized using standard saturated-absorption signals in both an Iron hollow cathode absorption cell and an Iodine cell. [less ▲]

Detailed reference viewed: 57 (9 ULg)
Full Text
Peer Reviewed
See detailMultifractality of quantum wave functions
Martin, John ULg; Garcia-Mata, Ignacio; Giraud, Olivier et al

Poster (2013, March 19)

We study the multifractality of individual wave packets in a periodically kicked system through a combination of numerical and analytical works. We consider a version of the mathematical Ruijsenaars ... [more ▼]

We study the multifractality of individual wave packets in a periodically kicked system through a combination of numerical and analytical works. We consider a version of the mathematical Ruijsenaars-Schneider model and reinterpreted it physically in order to describe the spreading with time of quantum wave packets in a system where multifractality can be tuned by varying a parameter [1]. We compare different methods to measure the multifractality of wave packets and identify the best one. We find the multifractality to decrease with time until it reaches an asymptotic limit, which is different from the multifractality of eigenvectors but related to it, as is the rate of the decrease. Our results could guide the study of experimental situations where multifractality is present in quantum systems. [less ▲]

Detailed reference viewed: 23 (4 ULg)
Peer Reviewed
See detailInhibition of Fusarium culmorum and Cochliobolus sativus growth
Kaddes, Amine ULg

Poster (2013, March 19)

Detailed reference viewed: 33 (9 ULg)