References of "Scientific congresses and symposiums"
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See detailInteractions of a potential plant elicitor mannolipid with plant model membranes
Polo Lozano, Damien ULg; Lins, Laurence ULg; Ongena, Marc ULg et al

Poster (2014, February 07)

The use of chemical pesticides causes problems for human health and environment. In this context, there is an increasing interest for alternative products such as biopesticides. Among them, elicitors act ... [more ▼]

The use of chemical pesticides causes problems for human health and environment. In this context, there is an increasing interest for alternative products such as biopesticides. Among them, elicitors act on the plants by inducing systemic resistance against diseases caused by fungal, viral, bacterial agents and insects. The target of the elicitors is supposed to be the plant plasma membranes (PPM). The main mechanisms of interaction of many elicitors involve proteic receptors but lipid-based elicitors (LBE) may preferably interact with the lipidic fractions of PPM. However there is no detailed information at the molecular level on the PPM-LBE interactions. Our work is focused on a original synthetic LBE composed of a mannoside linked to a myristic acid. It has potential elicitor activities as shown by the assays on tobacco root cells. These activities could be related to its interaction with the lipidic phase of PPM. Since PPM are complex entities, the analyses of the PPM- molecule interactions are quite difficult. In this context, these interactions were carried out using biomimetic membranes of PPM such as Langmuir monolayers and multilayers. The effects of our molecule on these membranar systems were investigated by biophysical and in silico approaches. [less ▲]

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See detailQuantitative gas chromatography - mass spectrometry profiling of volatile organic compounds produced by barley (Hordeum distichon L.) roots according to plant age
Delory, Benjamin ULg; Delaplace, Pierre ULg; du Jardin, Patrick ULg et al

Poster (2014, February 07)

In chemical ecology, the roles played by root-emitted volatile organic compounds (VOCs) in biotic interactions and the quantitative analysis of such chemicals in root tissues remain poorly documented. In ... [more ▼]

In chemical ecology, the roles played by root-emitted volatile organic compounds (VOCs) in biotic interactions and the quantitative analysis of such chemicals in root tissues remain poorly documented. In this context, this study aims at developing a fully automated analytical methodology allowing both identification and accurate quantification of VOCs produced by roots of a monocotyledon plant species. Briefly, VOC emitted by crushed barley roots are successively trapped by dynamic headspace sampling on Tenax TA adsorbents, thermally desorbed and cryofocused, separated by gas chromatography (GC) and finally analysed by mass spectrometry (MS) in both SCAN and selected ion monitoring modes. Results show that barley roots mainly produce four volatile aldehydes, namely hexanal, (E)-hex-2-enal, (E)-non-2-enal and (E,Z)-nona-2,6-dienal. These molecules are well-known linoleic (C18:2) and linolenic (C18:3) acid derivatives produced via the lipoxygenase and the hydroperoxide lyase pathways of higher plants. Our findings contrast with analyses documented on aboveground barley tissues that mainly emit C6 aldehydes, alcohols and their derivative esters. Moreover, preliminary results indicate quantitative changes in the volatile profile contained in barley roots according to plant age. Multivariate statistical analyses are currently underway to quantitatively assess these changes using plants at five selected developmental stages ranging from germination to the end of tillering. [less ▲]

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See detailarchiDART: a R package allowing root system architecture analysis using Data Analysis of Root Tracings (DART) output files
Delory, Benjamin ULg; Baudson, Caroline ULg; Brostaux, Yves ULg et al

Poster (2014, February 07)

In 2010, Le Bot et al presented a free and open-access software (Data Analysis of Root Tracings - DART) allowing the analysis of complex root system architectures from captured images, particularly across ... [more ▼]

In 2010, Le Bot et al presented a free and open-access software (Data Analysis of Root Tracings - DART) allowing the analysis of complex root system architectures from captured images, particularly across time series. Using this software, a user has to manually identify roots as a set of links. After vectorization of a root system, three final data sets (RAC, TPS and LIE) can be exported as table files containing several attributes for (a) each individual root (e.g. root length), (b) each observation day or (c) each point used to construct the vectorized root system respectively. These data sets can finally be used either to calculate derived root system architecture (RSA) parameters or to draw the root system architecture at selected observation dates. However when an experiment involves the analysis and comparison of many root systems, the calculation of RSA parameters for each data set and the drawing of the corresponding vectorized root systems become time-consuming. In this context, we developed a R package, called archiDART, allowing both the automatic calculation of common root architecture parameters and the X-Y plotting of vectorized root systems for selected observation dates. [less ▲]

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See detailUsing micro-injection technique to assess fungal toxicity in mosquito control
Bawin, Thomas ULg; Boukraa, Slimane; Seye, Fawrou et al

in Communications in Agricultural and Applied Biological Sciences (2014, February 07), 79(1), 181-185

Topical application of insecticidal compounds allows directly exposing these substances on insect tissues and measuring their toxicity while ignoring many factors. However, this technique remains ... [more ▼]

Topical application of insecticidal compounds allows directly exposing these substances on insect tissues and measuring their toxicity while ignoring many factors. However, this technique remains difficult to apply on mosquito larvae considering their aquatic lifestyle. Micro-injection could be used for the direct deposition of toxic compounds in the larvae. Capillaries exhibiting an injection tip with an external diameter of 0.5 mm have been designed from silica tubes. For each treatment, a capillary is mounted on a pump connected to a flow rate regulator. Culex quinquefasciatus larvae were injected with 10^7 spores/ml of entomopathogenic fungi (Aspergillus clavatus, Metarhizium anisopliae, Metarhizium sp.). Mortalities were recorded daily during 72h. The distribution of spores stained with methylene blue and injected into the body of larvae was also observed according to the system described. Results showed that spores were distributed over the whole body. The injection of Aspergillus clavatus, Metarhizium anisopliae and Metarhizium sp spores induced corrected mortalities of 62%, 53% and 57% after 72h, and differed statistically from control groups. Finally, post-mortem emergences of filaments from dead larvae were observed in the case of the three fungal strains confirming spore viability. Injection of inactivated spores (or inert bodies of similar size) could help to reject the hypothesis of a response due to the presence of foreign bodies. [less ▲]

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See detailEstimating daily yield and content of major fatty acids from single milking
Arnould, Valérie ULg; Reding, Romain; Delvaux, Charles et al

Poster (2014, February 07)

Reducing the frequency of milk recording and the number of recorded samples per test-day could be a solution in order to reduce costs of official milk recording. However, fewer samples lead to a decrease ... [more ▼]

Reducing the frequency of milk recording and the number of recorded samples per test-day could be a solution in order to reduce costs of official milk recording. However, fewer samples lead to a decrease in the accuracy of predicted daily yields. Unfortunately, the current published equations use the milking interval that is often not available and/or reliable in practice. The first objective of this study was to propose models using easily available traits. Therefore the milking interval was replaced by a combination of data easily recorded by milk recording. The second objective of this study was to enlarge the previous investigations to milk fatty acids (FA) in order to propose a practical method for estimating accurate daily milk, fat and major FA yields from single milking. The fit goodness of proposed models was evaluated based on the correlation values between the estimated and observed daily yields in addition to the calculation of the mean square error. Obtained results are promising. Correlation values were comprised between 96.4% and 97.6% when daily yield were estimated from morning milking, and from 96.9% to 98.3% when daily yield were estimated from evening milking. The combination of records related to lactation stage, month of test, milk yield, and fat could replace the milking interval effect. Because of their simplicity, proposed models would be easy to implement. [less ▲]

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See detailSimulations of a beta amphiphilic peptide as potential surfactant of membrane proteins
Crowet, Jean-Marc ULg; Dony, Nicolas ULg; Deschamps, Antoine et al

Poster (2014, February 07)

The peptide studied here was designed to form beta amphiphilic films with the aim to stabilize purified membrane proteins. This interaction has notably been followed by FRET. Hydrophobic and hydrophilic ... [more ▼]

The peptide studied here was designed to form beta amphiphilic films with the aim to stabilize purified membrane proteins. This interaction has notably been followed by FRET. Hydrophobic and hydrophilic residues are alternate and positively and negatively charged residues place respectively at the start end the end of the peptide. The peptide has been studied by atomistic and coarse grained molecular dynamics in water, chloroform and mixed solutions. The peptide was observed to spontaniously form beta films at the chloroform water interface. Moreover, when we simulate the interaction of this peptide with a membrane protein and with a membrane protein in a micelle of dodecylphosphocholine. The peptide was observed to form beta films at the membrane protein surface and even remove surfactants from the membrane protein surface. The simulations confirms the behaviour of this peptide observed in vitro and shows that it could be used instead of detergents. [less ▲]

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See detailSreening of essential oils against rice pathogens isolated from Madagascar
Mamiharisoa Razanakoto, Léa ULg; De Clerck, Caroline ULg; Massart, Sébastien ULg et al

Poster (2014, February 07)

Four predominant isolated pathogens have been identified during survey of rice diseases in three regions in Madagascar. These pathogens were the bacteria Xanthomonas oryzae pv. oryzae and Pseudomonas ... [more ▼]

Four predominant isolated pathogens have been identified during survey of rice diseases in three regions in Madagascar. These pathogens were the bacteria Xanthomonas oryzae pv. oryzae and Pseudomonas fuscovaginae and the fungi Alternaria sp. and Curvularia lunata. These pathogens are causing significant yield reduction on rice, which is the staple food in this country. After the identification of those pathogens, the objective of this work was to identify appropriate control measures against them. Plants extracts has been traditionally used to control diseases in other plant species. Nowadays, the problem of residues of phytopharmaceutical product, reinforce the need for research on the development of natural plant extracts to control plant diseases. Madagascar has many endemic plant of interest and we have evaluated the antimicrobial properties of essential oils from Malagasy plants. The main object of this study is the in-vitro screening of essential oils to control the pathogens isolated on rice in Madagascar. Thirty nine essentials oils from Madagascar had been tested. Activity of essentials oils on Pseudomonas fuscovaginae, Alternaria sp. and Curvularia lunata had been tested using broth media and on agar medium for Xanthomonas oryzae pv. oryzae. The growth of the pathogen (bacteria and conidia) in the presence of the essential oil was evaluated and compared to a control. Nine of the 39 essentials oils showed interesting antimicrobial activity with an efficiency more than 70% against at least one bacterial pathogen. One essential oil inhibited the growth of the two pathogens tested. For fungal pathogens, three essential oils presented an efficiency of more than 70% against at least one fungal pathogen. These results confirm that some essential oils present an interesting antimicrobial activity. The in-situ confirmation on plant of this activity is currently ongoing. [less ▲]

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See detailIs the noxious Ambrosia artemisiifolia L. going to invade Belgium?
Ortmans, William ULg; Chauvel, Bruno; Mahy, Grégory ULg et al

Poster (2014, February 07)

Ambrosia artemisiifolia L. is an invasive species from North America, causing a health crisis in Europe due to its highly allergenic pollen. In France, there is a zone where the A. artemisiifolia ... [more ▼]

Ambrosia artemisiifolia L. is an invasive species from North America, causing a health crisis in Europe due to its highly allergenic pollen. In France, there is a zone where the A. artemisiifolia populations are naturalized and invasive. Outside this area, populations are more rare and do not seem to expand. We tested if the performances of A. artemisiifolia are varying with competition level, and among geographical zones. The results show that populations from Belgium and Netherlands are not less efficient than invasive populations for the measured traits. [less ▲]

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See detailAllelopathic potential of sunflower against the great brome
Bouhaouel, Imen ULg; Gfeller, Aurélie; Fauconnier, Marie-Laure ULg et al

Poster (2014, February 06)

Control methods commonly used to suppress the great brome (Bromus diandrus Roth., syn. Bromus rigidus Roth. subsp. gussonii Parl.) in Tunisian cereal crop are essentially chemical, raising both efficacy ... [more ▼]

Control methods commonly used to suppress the great brome (Bromus diandrus Roth., syn. Bromus rigidus Roth. subsp. gussonii Parl.) in Tunisian cereal crop are essentially chemical, raising both efficacy and safety issues. The introduction of allelopathic species into the crop rotation or utilizing allelopathic plants as living/green mulches has been suggested as a cost-effective way to reduce the weed presence. Among these species, the sunflower (Helianthus annuus L.) has shown an allelopathic potential against some troublesome weed species. In this study, we analyzed the biological activities of water extract of different tissues (root, shoot, leaf and flower) of sunflower on the seedling establishment of the great brome. In a second experiment, the allelopathic influence of sunflower residues (leaf or flower) against this weed was also studied under glasshouse conditions at more advanced stages of growth using different concentrations (0, 6, 12 and 18g tissue dry weight / kg of soil). The first experiment showed an effect depending on the parts of the sunflower. Indeed, the roots seem to be the less allelopathic part (22% of root inhibition growth) as compared to the leaves and flowers (82% and 100%, respectively). This potential seems to simultaneously affect the radicle and the coleoptile growth of the great brome. In the second experiment, weed growth was inhibited in a dose-dependent manner, using increasing amounts of sunflower residues. The allelopathic potential of the leaves or flowers reduced both the root or shoot length and biomass accumulation of the weed. These results suggest that the sunflower can be a good previous crop for cereal cultivation by controlling the presence of some weeds, including the great brome. In this perspective, the inhibitory effects of sunflower residues on cultivated cereals in the field need to be assessed. [less ▲]

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See detailForecasting Daily Solar Energy Production Using Robust Regression Techniques
Louppe, Gilles ULg; Prettenhofer, Peter

Conference (2014, February 05)

We describe a novel approach to forecast daily solar energy production based on the output of a numerical weather prediction (NWP) model using non-parametric robust regression techniques. Our approach ... [more ▼]

We describe a novel approach to forecast daily solar energy production based on the output of a numerical weather prediction (NWP) model using non-parametric robust regression techniques. Our approach comprises two steps: First, we use a non-linear interpolation technique, Gaussian Process regression (also known as Kriging in Geostatistics), to interpolate the coarse NWP grid to the location of the solar energy production facilities. Second, we use Gradient Boosted Regression Trees, a non-parametric regression technique, to predict the daily solar energy output based on the interpolated NWP model and additional spatio-temporal features. Experimental evidence suggests that two aspects of our approach are crucial for its effectiveness: a) the ability of Gaussian Process regression to incorporate both input and output uncertainty which we leverage by deriving input uncertainty from an ensemble of 11 NWP models and including convidence intervals alongside the interpolated point estimates and b) the ability of Gradient Boosted Regression Trees to handle outliers in the outputs by using robust loss functions - a property that is very important due to the volatile nature of solar energy output. We evaluated the approach on a dataset of daily solar energy measurements from 98 stations in Oklahoma. The results show a relative improvement of 17.17% and 46.19% over the baselines, Spline Interpolation and Gaussian Mixture Models, resp. [less ▲]

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See detailPaleoenvironmental record of the Amik Basin (Amuq Plain, Southern Turkey) over the last 4000 years
Hubert, Aurelia ULg; El Ouahabi, Meriam ULg; Lebeau, Hélène ULg et al

Poster (2014, February 04)

Continous human occupation is attested in the Amik Basin since 6000-7000 BC. The low-lying Amuq plain is covered by tell settlements first explored by Robert Braidwood in the 1930s. The Basin also is ... [more ▼]

Continous human occupation is attested in the Amik Basin since 6000-7000 BC. The low-lying Amuq plain is covered by tell settlements first explored by Robert Braidwood in the 1930s. The Basin also is crossed by The Dead Sea Fault (DSF), a major neotectonic structure in the Middle East extending from the Red Sea in the south to Turkey in the north. The study focuses on the sedimentary record of the Amik Lake occupying the central part of the Basin. Our objective is to constrain major paleo-environmental changes in the area over the last 4000 years and assess possible human impact. The lake has been drained and progressively dried up since the mid-50s so that it is not watered during the summer season and constitutes a unique opportunity to collect sediment records. Sediments were collected at 1 cm to 2 cm intervals in a trench and in cores up to a depth of 5 meters in the clay deposits. A diverse array of complementary methods is applied to study the records: magnetic susceptibility, grain size, organic matter and inorganic carbon (L.O.I), XRD mineralogy, XRF geochemistry, carbon geochemistry. The age of the record is constrained combining radionuclide and radiocarbon dating. The record shows two intense phases of soil erosion with enrichments in Chromium and Nickel. The most recent erosion phase might be linked with enhanced development during the Roman and the growth of the Antioch City. The oldest one would occur around 3000 BC. The record also allows reconstructing past lake level variations and discusses the results in comparison with variations of the Dead Sea. [less ▲]

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See detailLes représentations de Synagoga aux portails occidentaux de la cathédrale d’Amiens : l’illustration de l’ « antijudaïsme » au lendemain de Latran IV ?
Lekane, Marie ULg

Conference (2014, February 04)

Les portails occidentaux amiénois sont munis de trois représentations de la Synagogue, sous la forme bien connue d’une personnification féminine aux yeux bandés. Deux scènes particulières, montrant la ... [more ▼]

Les portails occidentaux amiénois sont munis de trois représentations de la Synagogue, sous la forme bien connue d’une personnification féminine aux yeux bandés. Deux scènes particulières, montrant la Synagoga, se jouent sur des culots du portail de la Vierge, sous les pieds des Rois mages. Si l’une de ces scènes semble représenter le découronnement de la figure allégorique par le Christ, la seconde est plus énigmatique. Au portail du Jugement dernier, sous les pieds de l’archange Michel, se loge le couple antagoniste Ecclesia-Synagoga. La position éminemment négative de la Synagogue – sous le plateau démoniaque, à senestre du Christ, côtoyant le monde infernal – fait-elle écho aux récentes positions contre les Juifs prises et actées lors du Concile de Latran IV (1215) ? Afin de pouvoir amener des pistes de réflexions sur ces points, déjà soulevés par certains auteurs (W. Schlink, 1991), nous interrogerons les sources historiques sur la présence effective d’une communauté juive à Amiens et sur leurs conditions de vie. En outre, et plus généralement, nous analyserons les retombées tangibles des décisions prises lors du Concile de 1215, auquel participait Jean d’Abbeville, doyen de la cathédrale d’Amiens au moment de sa reconstruction, volontiers présenté comme « programmateur » de l’ensemble. Il est indispensable de reconsidérer soigneusement ces images et leurs composantes afin de définir leurs particularités et d’infirmer ou confirmer un « antijudaïsme » aux portails amiénois, ou du moins de pouvoir le caractériser. [less ▲]

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See detailCoMBiSpeC: A novel approach in the modelling of massive binaries
Palate, Matthieu ULg

in EAS Publications Series (2014, February 01)

Spectral modelling and especially for massive stars is not a straightforward problem and over the past decades many advances have been made in this field. We now have sophisticated model atmosphere codes ... [more ▼]

Spectral modelling and especially for massive stars is not a straightforward problem and over the past decades many advances have been made in this field. We now have sophisticated model atmosphere codes that allow to derive the stellar parameters. However, these codes are based on the assumption that the star is single and spherical which is no longer valid for the components of a binary system. On the other hand, observational studies indicate that binarity has an impact on the spectra. This is why we have developed a model called CoMBiSpeC (code of massive binary spectral computation) that specifically accounts for the impact of binarity on the spectra. [less ▲]

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See detailNovel fibroblast growth factor receptor 1 mutation causing normosmic idiopathic hypogonadotropic hypogonadism
Chachati, AS; Potorac, I; DEBRAY, François-Guillaume ULg et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailG-mode trapping and period spacings in hot B subdwarf stars
Charpinet, Stéphane; Van Grootel, Valérie ULg; Brassard, Pierre et al

in Proceedings of the International Astronomical Union (2014, February), 301

Hot B subdwarfs (sdB) are hot and compact helium core burning stars of nearly half a solar mass that can develop pulsational instabilities driving acoustic and/or gravity modes. These evolved stars are ... [more ▼]

Hot B subdwarfs (sdB) are hot and compact helium core burning stars of nearly half a solar mass that can develop pulsational instabilities driving acoustic and/or gravity modes. These evolved stars are expected to be chemically stratified with an almost pure hydrogen envelope surrounding a helium mantle on top of a carbon/oxygen enriched core. However, the sdB stars pulsating in g-modes show regularities in their observed period distributions that, surprisingly (at first sight), are typical of the behavior of high order g-modes in chemically homogeneous (i.e., non-stratified) stars. This led to a claim that hot B subdwarfs could be much less chemically stratified than previously thought. Here, we reinvestigate trapping effects affecting g-modes in sdB stars. We show that standard stratified models of such stars can also produce nearly constant period spacings in the low frequency range similar to those found in g-mode spectra of sdB stars monitored with Kepler. [less ▲]

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See detailBacterial and viral pneumonia
Clercx, Cécile ULg

in Proceedings 35 Internationaler Fortbildungskurs Kleintierkrankheiten (2014, February)

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See detailPredicative Possession in Late Egyptian (with special attention to incipient grammaticalization processes)
Polis, Stéphane ULg

Conference (2014, February)

In this talk, I provide a description of the various types of constructions used for expressing clausal (‘predicative’) possession in Late Egyptian. The corpus is comprehensively defined to include both ... [more ▼]

In this talk, I provide a description of the various types of constructions used for expressing clausal (‘predicative’) possession in Late Egyptian. The corpus is comprehensively defined to include both literary and non-literary texts from the reign of Thutmose 3 (c. 1450 BC) down to abnormal hieratic texts (c. 600 BC), excluding most of the texts in Égyptien de tradition (i.e. purposely imitating various registers of EEg). The talk is structured in three sections that reflect both functional and structural features: (1) The adjectival predicate pattern or the marked expression of ownership; (2) The comitative strategy or the unmarked expression of possession; (3) Other types of predicative possession in Late Egyptian. [less ▲]

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See detailLong fibrosis
Clercx, Cécile ULg

in proceedings 35 Internationaler Fortbildungskurs Kleintierkrankheiten (2014, February)

Detailed reference viewed: 11 (1 ULg)
Peer Reviewed
See detailExploration on structure activity relation of natural, self-assembling cyclic lipodepsipeptides
Geudens, Niels; Feher, Kristina; De Vleeschouwer, Matthias et al

Poster (2014, February)

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See detailLiege acromegay Survey : An epidemiological study about the average age of death and the causes of mortality of acromegalic patients managed in liege
Petignot, S; PETROSSIANS, Patrick ULg; Daly, Adrian ULg et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailLes modèles économiques du bioraffinage en région wallonne : de l'exploration des débouchés et des niches de marché aux stratégies de développement industriel
Richel, Aurore ULg

Conference (2014, February)

1) Acteurs de la bio-économie en Wallonie 2 Transition vers le bioraffinage de seconde génération ? Les grandes questions et éléments de réponse (Flux de matières premières ?, Technologies de conversion ... [more ▼]

1) Acteurs de la bio-économie en Wallonie 2 Transition vers le bioraffinage de seconde génération ? Les grandes questions et éléments de réponse (Flux de matières premières ?, Technologies de conversion ? Produits cibles et marchés ? Positionnement des acteurs académiques et privés sur la chaine de valeur ? 3) Flux de matières premières en Wallonie – Carte d’occupation des sols, inventaire du potentiel en biomasse pour le bioraffinage de seconde génération (biomasse agricole, forestière, coproduits des industries de transformation food et non-food) 4) Quel(s) produit(s) et quel(s) marché(s) ? Liste des 10 molécules d’intérêt pour la Wallonie, molécules à haute valeur ajoutée et marchés de niche, cibles actuelles des recherches académiques et industrielles 5) Stratégie wallonne en termes de bioraffinage de seconde génération – quelques exemples d’initiatives R&D privées et publiques 6) Conclusions [less ▲]

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See detailAnthropogenic effects on African Landscapes: Spatial Structure, Typologies, Ecological Impact
Vranken, Isabelle ULg

Poster (2014, February)

The problematique of anthropogenic disturbance on African landscapes is studied within the double framework of DPSIR (Drivers Pressures States Impact Response) and Pattern/Process Paradygm (Landscape ... [more ▼]

The problematique of anthropogenic disturbance on African landscapes is studied within the double framework of DPSIR (Drivers Pressures States Impact Response) and Pattern/Process Paradygm (Landscape Ecology). 20 landscae images from D.R. Congo, Ivory Coast and Benin were studied using indexes of spatial (compositional and configurational) heterogeneity and anthropogenic disturbance in order to highlight the relationship between spatial structure and disturbance intensity. The results show maximal heterogeneity at intermediate anthropogenic disturbances and fasten the triangular relationship between anthropogenic effect, biodiversity and spatial heterogeneity, that had been partially theoretised with the intermidiate disturbance and habitat heterogeneity hypotheses. [less ▲]

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See detailHypopituitarism in pituitary gigantism (results of an international study)
Rostomyan, L; Daly, Adrian ULg; Shah, N et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailMicrofluidic on optical fibers: Towards a new kind of fluorescent biosensor
Lismont, Marjorie ULg; Vandewalle, Nicolas ULg; Weyer, Floriane ULg et al

Poster (2014, February)

In recent works, the behavior of droplets moving along vertical treads due to gravity was studied. It appeared that the droplet can be stopped by encountering a horizontal fiber depending on droplet ... [more ▼]

In recent works, the behavior of droplets moving along vertical treads due to gravity was studied. It appeared that the droplet can be stopped by encountering a horizontal fiber depending on droplet volumes and fiber characteristics. On the basis of this behavior and by replacing treads by two crossed optical fibers, it is possible to combine fluidics and optics to develop a new kind of fluorescent sensor. In our work, the intersection between two crossed optical fibers is used as the basic unit of an original optofluidic biosensor. These two optical fibers are used as droplets carriers: one for probe molecules and the other one for target species. The fiber's junction catches the droplets and act as a reaction center. The main advantage of using optical fibers resides in their ability to propagate and collect light to and from the droplet localized at the fiber's crossing. This optical fiber configuration can therefore allow the study of biological interactions using fluorescent labels. This new and versatile detection scheme was validated on a calcium indicator where ions detection is accomplished by using a dye, Oregon green Bapta-2, that has a Ca 2+ recognition group as well as an entity exhibiting fluorescence. A FRET recognition event, between Rh-Con A and FITC-Dextran, was also investigated to detect glucose. Finally, a prototype of a multiplexing device, composed of several juxtaposed fibers' junctions, was developed. [less ▲]

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See detailThe harmonic balance method for advanced analysis and design of nonlinear mechanical systems
Detroux, Thibaut ULg; Renson, Ludovic ULg; Kerschen, Gaëtan ULg

in Proceedings of the SEM IMAC XXXII (2014, February)

As a tool for analyzing nonlinear large-scale structures, the harmonic balance (HB) method has recently received increasing attention in the structural dynamics community. However, its use was so far ... [more ▼]

As a tool for analyzing nonlinear large-scale structures, the harmonic balance (HB) method has recently received increasing attention in the structural dynamics community. However, its use was so far limited to the approximation and study of periodic solutions, and other methods as the shooting and orthogonal collocation techniques were usually preferred to further analyze these solutions and to study their bifurcations. This is why the present paper intends to demonstrate how one can take advantage of the HB method as an efficient alternative to the cited techniques. Two different applications are studied, namely the normal modes of a spacecraft and the optimization of the design of a vibration absorber. The interesting filtering feature of the HB method and the implementation of an efficient bifurcation tracking extension are illustrated. [less ▲]

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See detailNew alternatives to chemical pesticides: deciphering the action mechanisms of lipid based plant elicitors via complementary biophysical and biological approaches.
Nasir, Mehmet Nail ULg; Polo Lozano, Damien ULg; Luzuriaga Loaiza, Walter ULg et al

Poster (2014, February)

Nowadays, many health and environmental problems are caused by the use of chemical pesticides. In this context, an increasing demand for alternative products such as biopesticides has been observed. Among ... [more ▼]

Nowadays, many health and environmental problems are caused by the use of chemical pesticides. In this context, an increasing demand for alternative products such as biopesticides has been observed. Among biopesticides, elicitor molecules which are able to trigger immune defense responses in plants are one of the most promising options. Although numerous elicitors have been discovered, the mechanisms involved in the perception, by plants, of only a few molecules have been identified. These elicitors usually interact with proteic receptors but we have recently shown that they may also act on the lipid phase of the plasma membrane. This project first aims to improve our understanding of the molecular mechanisms involved in the recognition of specific lipid based elicitors (LBE). On that basis, the FIELD project will contribute to the design and the development of innovative compounds derived natural LBE. A multi-disciplinary approach, based on chemistry, bio-physics, bio-chemistry, and phytopathology will be followed by a consortium of different research groups from Gembloux Agro-Bio Tech in close collaboration with teams from foreign institutions. [less ▲]

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See detailCan a global dynamic vegetation model be used for both grassland and crop modeling at the local scale?
Minet, Julien ULg; Tychon, Bernard ULg; Jacquemin, Ingrid ULg et al

Poster (2014, February)

We report on the use of a dynamic vegetation model, CARAIB, within two modeling exercises in the framework of MACSUR. CARAIB is a physically-based, mechanistic model that calculates the carbon ... [more ▼]

We report on the use of a dynamic vegetation model, CARAIB, within two modeling exercises in the framework of MACSUR. CARAIB is a physically-based, mechanistic model that calculates the carbon assimilation of the vegetation as a function of the soil and climatic conditions. Within MACSUR, it was used in the model intercomparison exercises for grassland and crop modeling, in the LiveM 2.4 and CropM WP4 tasks, respectively. For grassland modeling, blind model runs at 11 locations were performed for various time ranges (few years). For crop modeling, a sensitivity analysis for building impact response surfaces (IRS) was performed, based on a bench of model runs at different levels of perturbation in the temperature and precipitation input data over 30 years. For grassland modeling, specific management functions accounting for the cutting or grazing of the grass were added to the model, in the framework of the MACSUR intercomparison. Initially developed for modeling the carbon dynamics of the natural vegetation, CARAIB was already adapted for crop modeling but further modifications regarding the management, i.e., yearly-dependent sowing dates, were introduced. For grassland modeling, simulation results will be further intercompared with other modeling groups, but preliminary results showed that the model could cope with the introduction of the grass cutting module. For crop modeling, building the IRS over 30 years permitted to assess the sensitivity of the model to temperature and precipitation changes. So far, the participation of CARAIB in the intercomparison exercises within MACSUR resulted in further improvements of the model by introducing new functionalities. [less ▲]

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See detailBronchiectasis
Clercx, Cécile ULg

in Proceedings 35 Internationaler Fortbildungskurs Kleintierkrankheiten (2014, February)

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See detailBayesian methods for predicting and modelling winter wheat biomass
Mansouri, Majdi ULg; Dumont, Benjamin ULg; Destain, Marie-France ULg

Poster (2014, February)

The objectives of this paper are threefold. The first objective is to propose to use an Improved Particle Filtering (IPF) based on minimizing Kullback-Leibler divergence for crop models' predictions. The ... [more ▼]

The objectives of this paper are threefold. The first objective is to propose to use an Improved Particle Filtering (IPF) based on minimizing Kullback-Leibler divergence for crop models' predictions. The performances of the proposed technique are compared with those of the conventional Particle Filtering (PF) for improving nonlinear crop model predictions. The main novelty of this task is to develop a Bayesian algorithm for nonlinear and non-Gaussian state and parameter estimation with better proposal distribution. The second objective is to investigate the effects of practical challenges on the performances of state estimation algorithms PF and IPF. Such practical challenges include (i) the effect of measurement noise on the estimation performances and (ii) the number of states and parameters to be estimated. The third objective is to use the state estimation techniques PF and IPF for updating prediction of nonlinear crop model in order to predict winter wheat biomass. PF and IPF are applied at a dynamic crop model with the aim to predict a state variable, namely the winter wheat biomass, and to estimate several model parameters. Furthermore, the effect of measurement noise (e.g., different signal-to-noise ratios) on the performances of PF and IPF is investigated. The results of the comparative studies show that the IPF provides a significant improvement over the PF because, unlike the PF which depends on the choice of sampling distribution used to estimate the posterior distribution, the IPF yields an optimum choice of the sampling distribution, which also accounts for the observed data. [less ▲]

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See detailChronische Bronchitis Hund
Clercx, Cécile ULg

in Proceedings 35 Internationaler Fortbildungskurs Kleintierkrankheiten (2014, February)

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See detailDamage Detection in Civil Engineering Structure Considering Temperature Effect
Nguyen, Viet Ha; Mahowald, Jean; Maas, Stefan et al

in Proceedings of IMAC XXXII Dynamics of Coupled Structures (2014, February)

This paper concerns damage identification of a bridge located in Luxembourg. Vibration responses were captured from measurable and adjustable harmonic swept sine excitation and hammer impact. Different ... [more ▼]

This paper concerns damage identification of a bridge located in Luxembourg. Vibration responses were captured from measurable and adjustable harmonic swept sine excitation and hammer impact. Different analysis methods were applied to the data measured from the structure showing interesting results. However, some difficulties arise, especially due to environmental influences (temperature and soil-behaviour variations) which overlay the structural changes caused by damage. These environmental effects are investigated in detail in this work. First, the modal parameters are identified from the response data. In the next step, they are statistically collected and processed through Principal Component Analysis (PCA) and Kernel PCA. Damage indexes are based on outlier analysis. [less ▲]

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See detailMetal Enhanced Fluorescence: effect of surface coating
Lismont, Marjorie ULg; François, Alexandre; Dreesen, Laurent ULg et al

in SPIE proceeding (2014, February)

Among the emerging treatments for cancer, Photodynamic Therapy (PDT) is thought to be one of the most promising. PDT uses light sensitive molecules, or photosensitizer, to produce, under specific ... [more ▼]

Among the emerging treatments for cancer, Photodynamic Therapy (PDT) is thought to be one of the most promising. PDT uses light sensitive molecules, or photosensitizer, to produce, under specific irradiation, toxic reactive oxygen species (ROS) to kill cancer cells. However, the amount of ROS generated is limited by both the fluorescence lifetime of the photosensitizer and its concentration around the cancer cells. Metal Enhanced Fluorescence (MEF), a phenomenon arising when a fluorophore is in closed proximity to a metallic structure such as metallic films or nanostructures, is seen as a way to solve these problems by reducing the fluorescence lifetime and increasing the fluorescence emission of the fluorophore. Protoporphyrin IX (PpIX) is a commonly used photosensitizer to treat skin cancers, which presents an intense absorption band around 400 nm while emitting around 630 nm. Because silver nanoparticles (Ag NPs) exhibit a strong Localized Surface Plasmon Resonance (LSPR) around 400 nm, MEF of the PpIX is expected when immobilized onto Ag NPs. Here, we investigate the relevant parameters influencing the coupling effects between the LSPR in Ag NPs and PpIX attached onto the Ag NPs surface when the Ag NPs are dispersed in solution or electrostatically bound to a glass slide. In particular, we study the distance-dependent of MEF by applying multiple layers of polyelectrolyte to progressively increase the distance between Ag NPs and PpIX, covalently bond to the last polyelectrolyte layer as well as exploring the use of Ag NPs of different sizes ranging from 40 to 100 nm. [less ▲]

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See detailEvaluation of the Response of Shear Critical Walls Using a Three-Parameter Kinematic Theory
Mihaylov, Boyan ULg; Hannewald, Pia; Beyer, Katrin

in The 4th International fib Congress 2014 Mumbai - Proceedings (2014, February)

This paper discusses a newly developed three-parameter kinematic theory (3PKT) for shear critical walls with the help of four wall tests. The 3PKT is used to predict the pre- and post- peak response of ... [more ▼]

This paper discusses a newly developed three-parameter kinematic theory (3PKT) for shear critical walls with the help of four wall tests. The 3PKT is used to predict the pre- and post- peak response of the test units. Comparisons are performed with finite element (FE) models and plastic hinge models in combination with a shear degradation model. It is found that the latter underestimate the displacement capacity of the walls while the former do not predict well the post-peak response. The 3PKT with only three degrees of freedom captures the complete response of the walls provided that the size of the critical loading zone (CLZ) of the wall is well predicted. [less ▲]

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See detailEffective stress method to be used in beam finite elements to take local instabilities into account
Franssen, Jean-Marc ULg; Cowez, Baptiste; Gernay, Thomas ULg

in Proceedings of the 11th IAFSS Symposium (2014, February)

In the fire situation, Bernoulli beam finite elements are the workhorse used in numerical calculation model for simulating the behaviour of the structure. Such finite elements treat all sections as class ... [more ▼]

In the fire situation, Bernoulli beam finite elements are the workhorse used in numerical calculation model for simulating the behaviour of the structure. Such finite elements treat all sections as class 1 (stocky) sections whatever the slenderness of the plates that make the section, allowing the development of a full plastic stress distribution in the section which leads to complete plastic redistribution along the members in the structure. This type of element is thus not adapted for modeling structures that contain slender sections of class 2, 3 or 4. This document presents a new approach to take into account local instabilities in slender sections using beam finite elements. The new approach is based on an effective constitutive law of steel. The effective law is not symmetrical with respect to tension and compression because, in tension, the stress-strain relationship is not modified whereas, in compression, the stress-strain relationship is modified. [less ▲]

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See detailIdentification of a Time-varying Beam Using Hilbert Vibration Decomposition
Bertha, Mathieu ULg; Golinval, Jean-Claude ULg

in Proceedings of the International Modal Analysis Conference (IMAC) XXXII (2014, February)

The present work is concerned by modal identification of time-varying systems. For this purpose, a method based on instantaneous frequency identification and synchronous demodulation is used to extract ... [more ▼]

The present work is concerned by modal identification of time-varying systems. For this purpose, a method based on instantaneous frequency identification and synchronous demodulation is used to extract modal components from recorded signals. The proposed method of iterated sifting process is based on the Hilbert Vibration Decomposition (HVD) technique which is used to extract the instantaneous dominant vibrating component at each iteration. A source separation preprocessing step is introduced to treat multiple degree-of-freedom systems in an optimal way. Sources are used as reference signals to get a single instantaneous frequency of each mode for the demodulation on all the channels. The algorithm is presented and is applied to numerical simulation of a randomly excited time-varying structure for illustration purpose. The investigated structure is made up of a beam on which a non-negligible mass is traveling. The variable location of the mass results in changes in modal parameters. [less ▲]

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See detailA giant treated with growth hormone
Rostomyan, L; Potorac, I; Daly, Adrian ULg et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailCorrelations of the High Resolution MRI aspect of GH-secreting pituitary adenomas prior to treatment
Potorac, I; PETROSSIANS, Patrick ULg; Schillo, F et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailSoil Seed Bank : a poorly know component of forest regeneration
Douh, Chauvelin ULg; Daïnou, Kasso ULg; Fernandez Pierna, Juan-Antonio et al

Poster (2014, February)

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See detailSubspace and nonlinear-normal-modes-based identification of a beam with softening-hardening behaviour
Grappasonni, Chiara ULg; Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

in Proceedings of the International Modal Analysis Conference (IMAC) XXXII (2014, February)

The capability to reproduce and predict with high accuracy the behaviour of a real system is a fundamental task of numerical models. In nonlinear structural dynamics, additional parameters compared to ... [more ▼]

The capability to reproduce and predict with high accuracy the behaviour of a real system is a fundamental task of numerical models. In nonlinear structural dynamics, additional parameters compared to classical linear modelling, which include the nonlinear coefficient and the mathematical form of the nonlinearity, need to be identified to bring the numerical predictions in good agreement with the experimental observations. In this context, the present paper presents a method for the identification of an experimental cantilever beam with a geometrically nonlinear thin beam clamped with a prestress, hence giving rise to a softening-hardening nonlinearity. A novel nonlinear subspace identification method formulated in the frequency domain is first exploited to estimate the nonlinear parameters of the real structure together with the underlying linear system directly from the experimental tests. Then a finite element model, built from the estimated parameters, is used to compute the backbone of the first nonlinear normal mode motion. These numerical evaluations are compared to a nonlinear normal modes-based identification of the structure using system responses to stepped sine excitation at different forcing levels. [less ▲]

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See detailLe PPNAD, une cause rare de syndrome de Cushing
Petignot, S; VROONEN, Laurent ULg; HAMOIR, Etienne ULg et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailReceptor expression in craniopharyngiomas causing tumor growth in pregnancy : case report and review of the literature
VROONEN, Laurent ULg; Tome Garcia, M; THIRY, Albert ULg et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailClinical characteristics of patients with AIP mutation-related prolactinomas
Camby, S; Daly, Adrian ULg; VROONEN, Laurent ULg et al

in Abstract book - Symposium "Perspectives in Endocrinology" Congresses Highlights 2013:ECE Copenhagen, ENDO SF, SFE Paris (2014, February)

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See detailImportance of recent extreme weather variation in Djibouti and need for impact quantification
Nour Ayeh, Moustapha; Mahamoud, Ayan; Saad, Osman et al

Poster (2014, February)

This analysis shows that the current rainfall deficit is exceptional and historically unique. The significant population migration induced by the drought to Djibouti city must be supervised, especially ... [more ▼]

This analysis shows that the current rainfall deficit is exceptional and historically unique. The significant population migration induced by the drought to Djibouti city must be supervised, especially during their spontaneous settling. This presented example confirms that current rainfall shortages and increasing temperature extremes are impactinglocal people who urgently need adaptation and DRR strategies. It is necessary to reduce exposure to hydrological risks of these affected populations, in order that victims of the drought are not carried away by a rainfall excess. [less ▲]

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See detail7. Lutte intégrée contre les ravageurs
Chavalle, Sandrine; Censier, Florence ULg; Jacquemin, Guillaume et al

in Destain, Jean-Pierre; Bodson, Bernard (Eds.) Livre Blanc Céréales (2014, February)

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See detailOrigin and Pulsation of Hot Subdwarfs
Randall, Suzanna K; Fontaine, Gilles; Charpinet, Stéphane et al

in Proceedings of the International Astronomical Union (2014, February), 301

We briefly introduce hot subdwarfs and their evolutionary status before discussing the different types of known pulsators in more detail. Currently, at least six apparently distinct types of variable are ... [more ▼]

We briefly introduce hot subdwarfs and their evolutionary status before discussing the different types of known pulsators in more detail. Currently, at least six apparently distinct types of variable are known among hot subdwarfs, encompassing p- as well as g-mode pulsators and objects in the Galactic field as well as in globular clusters. Most of the oscillations detected can be explained in terms of an iron opacity mechanism, and quantitative asteroseismology has been very successful for some of the pulsators. In addition to helping constrain possible evolutionary scenarios, studies focussing on stellar pulsations have also been used to infer planets and characterize the rotation of the host star. [less ▲]

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See detailPulsations in white dwarf stars
Fontaine, Gilles; Bergeron, Pierre; Brassard, Pierre et al

in Proceedings of the International Astronomical Union (2014, February), 301

We first present a brief description of the six distinct families of pulsating white dwarfs that are now known. These are all opacity-driven pulsators showing low- to mid-order, low-degree gravity modes ... [more ▼]

We first present a brief description of the six distinct families of pulsating white dwarfs that are now known. These are all opacity-driven pulsators showing low- to mid-order, low-degree gravity modes. We then discuss some recent highlights that have come up in the field of white dwarf asteroseismology. [less ▲]

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See detailIMPACT OF COVER CROP MANAGEMENT ON CROP PRODUCTION: A FIELD EXPERIMENT IN WALLONIA CONTEXT
Hiel, Marie-Pierre ULg; Bodson, Bernard ULg

Poster (2014, February)

Minimal soil tillage methods, crop rotation, cover crop and continuous plant residue cover are the main pillars of sustainable agriculture. Lower energy consumption, costs and time are some direct ... [more ▼]

Minimal soil tillage methods, crop rotation, cover crop and continuous plant residue cover are the main pillars of sustainable agriculture. Lower energy consumption, costs and time are some direct benefits in favor to the adaptation of this agriculture. This practices aims also directly at protecting the soil from wind and water erosion by covering the soil. Lower disruption of the soil aims at developping the micro- and macro-fauna activity that increases soil fertility and carbon and nitrogen sequestration in soils. Unfortunately, some of the great constraints to the adaptation of conservation agriculture remain weed management, fungal diseases and pest management, that has been shown to be a problem in non-ploughed fields. The aim of our study is to evaluate, on a same field (Wallonia context), contrasted tillage methods for managing the cover crop and the implantation of the main crop. The following measurements were taken: germination rate, root and shoot biomass development, root notation (size and shape), leaf area index and quality of harvested product. Preliminary results indicate that the different tillage methods did not have a significant impact on crop production or development. However changes in germination dynamics were observed, the reduced tillage inducing slower germination. Regarding weeds populations, some difference were observed in weed occurrences. Since a field exp [less ▲]

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See detailHow to Bind the International Criminal Court by Human Rights Standards?
Deprez, Christophe ULg

Conference (2014, January 31)

Although no one seriously disputes the binding nature of human rights standards on the activity of the International Criminal Court (“the ICC” or “the Court”), the precise boundaries of this human rights ... [more ▼]

Although no one seriously disputes the binding nature of human rights standards on the activity of the International Criminal Court (“the ICC” or “the Court”), the precise boundaries of this human rights constraint still lack clarity. In particular, there is no consensus on the basis for such an obligation, especially given the fact that the Court is not party to the relevant international and regional instruments. It is argued that the lack of clarity on the exact foundations for the binding nature of human rights standards towards the Court presents a real threat to the development of international criminal jurisprudence. This is because the legal grounds on which the ICC is bound to respect individual rights are also determinative of the very content of the resulting obligations. This paper aims to contribute to remedy this lacuna by listing and critically assessing the theoretical legal constructions on the basis of which human rights law is commonly said to enter the framework of the Court. [less ▲]

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See detailImmunomodulatory effects of Rapamycin in xenogeneic GVHD
Ehx, Grégory ULg

Poster (2014, January 31)

Graft-versus-host disease (GVHD) remains a major cause of morbidity and mortality after allogeneic hematopoietic stem cell transplantation (HSCT). Several studies have shown that rapamycin (RAPA), an mTOR ... [more ▼]

Graft-versus-host disease (GVHD) remains a major cause of morbidity and mortality after allogeneic hematopoietic stem cell transplantation (HSCT). Several studies have shown that rapamycin (RAPA), an mTOR inhibitor with immunosuppressive properties, may reduce GVHD severity and mortality, notably by favoring regulatory T cells (Tregs) proliferation in vivo and in vitro. However, very few data have been reported about the global impact of this drug on the immune system in the context of GVHD. The present work investigates the cellular mechanisms by which RAPA delays death from xenogeneic GVHD induced by peripheral blood mononuclear cells infusion in NSG mice. Our results show that RAPA injections significantly delay death from xenogeneic GVHD and reduce disease severity. Flow cytometric analyses highlighted a strong reduction of human cells chimerism in mice together with higher CD4+/CD8+ T cells balance due to a lower proliferation of CD8+ T cells. In addition, the frequencies of naive CD4+ and CD8+ T cells were higher and the CD4+ T cells showed a reduced effector phenotype (CD45RO+CD27-). Tregs were positively affected as RAPA up-regulated their expression of Bcl-2 and Ki67 as well as their STAT5 phosphorylation level, leading to higher Treg frequency in treated mice. Altogether these data demonstrate that RAPA delays xenogeneic GVHD by lowering human chimerism and effector CD4+ frequency as well as promoting Tregs. [less ▲]

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See detailQuestions de droit pénal social - Petit état de la jurisprudence
Michiels, Olivier ULg

Conference (2014, January 31)

L'exposé portait sur les points suivants : L’obstacle à la surveillance Lien de subordination Les infractions règlementaires Le moyen tiré de la violation par l’article 5 de la loi du 4 août 1996 du ... [more ▼]

L'exposé portait sur les points suivants : L’obstacle à la surveillance Lien de subordination Les infractions règlementaires Le moyen tiré de la violation par l’article 5 de la loi du 4 août 1996 du principe de légalité L’article 128, 1° du Code de droit pénal social Cumul des allocations et non bis in idem La condamnation d’office au triple des cotisations éludées La libre circulation des travailleurs provenant d’un nouvel Etat membre de l'Union Le mandataire ad hoc Le concours entre infractions de droit commun et de droit pénal social [less ▲]

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Peer Reviewed
See detailAn exact bi-directional dynamic programming algorithm for an elementary shortest path problem with variable service start time
Arda, Yasemin ULg; Crama, Yves ULg; Kucukaydin, Hande ULg

Conference (2014, January 31)

We consider an elementary shortest path problem with resource constraints (ESPPRC), where a capacitated single vehicle serves customers by respecting their associated time windows. The vehicle can start ... [more ▼]

We consider an elementary shortest path problem with resource constraints (ESPPRC), where a capacitated single vehicle serves customers by respecting their associated time windows. The vehicle can start servicing the customers at any desired time, but it can be used for a fixed amount of time. The total transportation cost depends on the total distance traveled and the total amount of time that the vehicle spends by performing the assigned trip. On the other hand, each served customer yields a revenue. Thus, the aim is to identify the path to be followed and the start time of the vehicle from the depot that minimize the total transportation cost minus the gained revenues. This kind of a problem can be encountered as a pricing subproblem when a branch-and-price algorithm is applied to solve vehicle routing problems with additional constraints. In such a case, the revenues correspond to the dual prices of the visited vertices. It is known that the classical ESPPRC can be solved to optimality by implementing a dynamic programming (DP) algorithm. However, our problem has to take an infinite number of Pareto-optimal states into consideration, since the vehicle can leave the depot at any point in time and charges depending on the total traveling and waiting time. We propose an exact DP algorithm which can deal with an infinite number of Pareto-optimal states by representing total traveling and waiting time as a piecewise linear function of the service start time at the depot and develop suitable dominance rules. Furthermore, a column generation algorithm is devised for solving the relaxed set covering formulation of the related vehicle routing problem where new columns are determined by the proposed DP algorithm. Finally, computational results are presented. [less ▲]

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See detailPerformances littéraires et genre: proposition à partir de la notion d’ethos à travers une lecture de The Brief Wondrous Life of Oscar Wao de J. Díaz.
Berlage, Pauline ULg

Conference (2014, January 31)

Face la population transnationale d’origine latino-américaine croissante à travers le monde – spécialement présente en Espagne et aux États-Unis – je me suis intéressée à la création littéraire en tant ... [more ▼]

Face la population transnationale d’origine latino-américaine croissante à travers le monde – spécialement présente en Espagne et aux États-Unis – je me suis intéressée à la création littéraire en tant que mise en récit de Soi et de l’Autre. Dans le cadre de cette littérature latinoaméricaine de la migration, je me centrerai sur la représentation du genre dans ces romans, c'est-à-dire sur ces attitudes performatives qui (re)produisent les normes et les modèles mais aussi parfois des corps a-normatifs et illisibles (Butler, T. de Lauretis). Je proposerai donc d’articuler la notion stimulante de performance de genre telle que proposée par J. Butler à celle d’ethos rhétorique (Amossy, Maingueneau) dans le but d’analyser la voix narrative du roman The Brief Wondrous Life of Oscar Wao de Junot Díaz (2008). Cette lecture nous permettra de mettre en lumière le jeu de va-et-vient par rapport aux stéréotypes de genre qui font autorité et, plus fondamentalement, la construction d’un corps queer apatride qui s’oppose "naturellement" au corps masculin de la diaspora. [less ▲]

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See detailLa question du concepteur d’ensembles sculptés au Moyen Âge : le cas des portails occidentaux de la cathédrale d’Amiens
Lekane, Marie ULg

Conference (2014, January 30)

In recent decades, art historians have used the notion of program in order to characterize the structuring of an artistic ensemble by a thought or a common idea which may be of political, aesthetic or ... [more ▼]

In recent decades, art historians have used the notion of program in order to characterize the structuring of an artistic ensemble by a thought or a common idea which may be of political, aesthetic or religious order. The three west portals of Amiens Cathedral lend themselves particularly well to a programmatic reflection because they are homogeneous in their chronology, their implementation and their style. The question is even more relevant in Amiens where the statues appear to be distributed and organized in a particularly harmonious and planned way. Once structural, stylistic and iconographic filiations with earlier buildings taken into account (Notre Dame de Paris, in particular), it should important to highlight some of the Amiens peculiarities. I place this research in line with Cécile Voyer’s remark which states that differences and variations convey precious information on the image makers’ intentions. My idea is to query some iconographic or formal particularities in echo with a figure linclosely associated with the construction process and with the theological-historical context. I am thinking, in particular, of the Council of Lateran IV convoked in November 1215, that is to say ten year before the building of the West portals supposedly started, which was attended by Evrard de Fouilloy, Bishop of Amiens, who is responsible for the reconstruction of the Cathedral from 1218. The eminence of the Dean Jean Halgrin of Abbeville, regent in Theology at the University of Paris and contemporary of the early stages of the reconstruction, invites us to wonder about his possible participation in the design of the overall Amiens. [less ▲]

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See detailQuadratic reformulations of nonlinear binary optimization problems
Crama, Yves ULg

Conference (2014, January 30)

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See detailLe créateur de carton de tapisserie au XVIe siècle. Remarques méthodologiques à partir de l’activité du peintre Michel Coxcie (1499-1592)
Laruelle, Anne-Sophie ULg

Conference (2014, January 30)

Cette communication se propose de revoir, d’une manière large, les questions liées à « l’auteur » en tapisserie, en les envisageant dans le cadre de l’activité de Michel Coxcie. Artiste de cour et peintre ... [more ▼]

Cette communication se propose de revoir, d’une manière large, les questions liées à « l’auteur » en tapisserie, en les envisageant dans le cadre de l’activité de Michel Coxcie. Artiste de cour et peintre officiel de la Ville de Bruxelles, Coxcie est de loin le plus inventif et le plus productif dans le domaine de la conception de pièces tissées entre les années 1540 et 1563. Nous verrons que la contribution du « Raphaël flamand » à la tapisserie est délicate à appréhender et se présente certainement comme la plus problématique de l’ensemble de son activité (en raison des transformations dues au passage du patron vers le textile, des multiples intervenants au sein de l’atelier…). Enfin, considérer en parallèle l’activité des autres cartonniers romanistes flamands (Bernard Van Orley, Pieter Coecke, Pieter de Kempeneer) et des artistes présents en Italie (Johannes Stradanus) peut assurément contribuer à une meilleure compréhension de ces problèmes et fournir des indications sur la méthode à adopter. L’objectif est également de déterminer les limites de notre propre enquête. [less ▲]

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See detailPourquoi pratiquer la philosophie dès l'école primaire ?
Herla, Anne ULg

Conference (2014, January 29)

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See detailInfluence du changement climatique sur l'accroissement du hêtre en Wallonie
Latte, Nicolas ULg; Claessens, Hugues ULg

Conference (2014, January 28)

Depuis quelques décennies, des signes d’affaiblissement de plus en plus marqués ont été observés sur le hêtre (Fagus sylvatica L.) un peu partout en Europe. L’inquiétude grandissante des gestionnaires ... [more ▼]

Depuis quelques décennies, des signes d’affaiblissement de plus en plus marqués ont été observés sur le hêtre (Fagus sylvatica L.) un peu partout en Europe. L’inquiétude grandissante des gestionnaires forestiers s’inscrit dans la problématique complexe du changement climatique. Une étude dendroécologique a donc été réalisée afin de mieux comprendre la relation entre l’accroissement du hêtre et son environnement. Des mesures de cernes ont été effectuées sur des échantillons de bois issus de 158 hêtres sélectionnés dans douze hêtraies (de 84 à 206 ans) situées le long du gradient climatique de Wallonie (de 67 à 590 m d’altitude). L’analyse de l’évolution temporelle de l’accroissement et de sa relation avec le climat a abouti à 3 résultats majeurs : (1) l’accroissement du hêtre a augmenté à partir des années 30 puis à diminuer de manière soutenue à partir des années 1980, (2) la sensibilité climatique des hêtraies a aussi fortement augmenté et cette augmentation est plus forte pour les peuplements de base altitude, et (3) les températures plus élevées en été et en début d’automne ont un impact négatif de plus en plus prononcé sur l’accroissement. Le réchauffement global rend les arbres de plus en plus dépendants de l’eau disponible (précipitation et sol). Les sécheresses et canicules plus fréquentes et intenses semblent progressivement affaiblir les arbres que puissent de plus en plus dans leur réserve. L’étude comprend une discussion complète intégrant l’interprétation écophysiologique des résultats mis en évidence. [less ▲]

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See detailIntermediaries, transport costs and interlinked transactions
Tharakan, Joseph ULg

Conference (2014, January 28)

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See detailGIGA ANIMAL CARE : Mice & Zebrafish Animal Facility and Transgenesis
Remy, Benoît ULg; Ectors, Fabien ULg; Winandy, Marie ULg et al

Poster (2014, January 27)

In fundamental research, animal models allow to place molecular and cellular observations back into their physiological context. In applied research, these models still remain a mandatory step to evaluate ... [more ▼]

In fundamental research, animal models allow to place molecular and cellular observations back into their physiological context. In applied research, these models still remain a mandatory step to evaluate the efficiency and the toxicity of potential treatments, before going to clinical trials. Mouse and Zebrafish (Danio rerio) are two very interesting models because of a short live cycle and a high prolificacy. They require a limited space. Their genome is well known and shows a high homology with the human. Many tools are available to produce transgenic mice or zebrafishes. Many tests are validated using both these species. [less ▲]

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See detailCryopreservation of embryos : a way to reduce the number of housed animals and the genetic drift.
Remy, Benoît ULg; Ectors, Fabien ULg; Drion, Pierre ULg

Poster (2014, January 27)

The GIGA Mouse facility platform has recently improved its mouse line cryopreservation technique. The method of embryo cryopreservation by rapid cooling also called aseptic vitrification has been selected ... [more ▼]

The GIGA Mouse facility platform has recently improved its mouse line cryopreservation technique. The method of embryo cryopreservation by rapid cooling also called aseptic vitrification has been selected. Vitrification media, key steps and timing have been optimized and validated. After a first partial exposition of the embryos to cryoprotective solutions, they are immersed in a vitrifying mixture of penetrating and non-penetrating cryoprotectants for a short time. The straw containing the embryos is immediately sealed before to be plunged in LN2, resulting in a brutal solidification in which crystallization does not have time to occur. [less ▲]

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See detailThe small Heat Shock Proteins (HSPs) response following eccentric exercise
Hody, Stéphanie ULg; Simonet, Arnaud; Lacrosse, Zoé ULg et al

in Abstract Book GIGA Day 2014 (2014, January 27)

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See detailImmunomodulatory effects of Rapamycin in xenogeneic GVHD
Ehx, Grégory ULg; HANNON, Muriel ULg; DUBOIS, Sophie ULg et al

Poster (2014, January 27)

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See detailL'oxydation des poudres: un défi pour l'avenir
Blecker, Christophe ULg

Poster (2014, January 27)

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See detailKisspeptin and neuronal nitric oxide signaling are important in female sexual behavior
Hellier, Vincent ULg; Bakker, Julie

Poster (2014, January 27)

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See detailScikit-Learn: Machine Learning in the Python ecosystem
Joly, Arnaud ULg; Louppe, Gilles ULg

Poster (2014, January 27)

The scikit-learn project is an increasingly popular machine learning library written in Python. It is designed to be simple and efficient, useful to both experts and non-experts, and reusable in a variety ... [more ▼]

The scikit-learn project is an increasingly popular machine learning library written in Python. It is designed to be simple and efficient, useful to both experts and non-experts, and reusable in a variety of contexts. The primary aim of the project is to provide a compendium of efficient implementations of classic, well-established machine learning algorithms. Among other things, it includes classical supervised and unsupervised learning algorithms, tools for model evaluation and selection, as well as tools for data preprocessing and feature engineering. This presentation will illustrate the use of scikit-learn as a component of the larger scientific Python environment to solve complex data analysis tasks. Examples will include end-to-end workflows based on powerful and popular algorithms in the library. Among others, we will show how to use out-of-core learning with on-the-fly feature extraction to tackle very large natural language processing tasks, how to exploit an IPython cluster for distributed cross-validation, or how to build and use random forests to explore biological data. [less ▲]

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See detailL’apport des cultes royaux hellénistiques au débat sur la polis religion dans le monde hellénistique
Caneva, Stefano ULg

Conference (2014, January 25)

La contribution suivante attire l’attention sur quelques enjeux du projet de recherche mené par l’Auteur, intitulé « Ritual Practicalities of Hellenistic Ruler Cults: A ‘Practice-Turn’ in the religious ... [more ▼]

La contribution suivante attire l’attention sur quelques enjeux du projet de recherche mené par l’Auteur, intitulé « Ritual Practicalities of Hellenistic Ruler Cults: A ‘Practice-Turn’ in the religious and social history of the Hellenistic period ». Le but de ce projet est de combler une lacune dans la recherche sur les cultes royaux hellénistiques en déplaçant l’attention de leurs justifications idéologiques, qui a occupé jusqu’ici une position prioritaire dans les études, à la pratique religieuse et à ses fondements sociaux. L’attention se concentrera donc sur les actes cultuels, en se posant la question de savoir comment, par qui et dans quels contextes les rituels pour les souverains furent intégrés dans la vie religieuse des communautés hellénistiques. Il s’agira de combiner l’histoire religieuse (usage, adaptation et innovation des traditions religieuses antérieures et d’éléments particuliers du culte en relation avec les cultes royaux) et l’histoire sociale et politique (les cultes royaux dans les dynamiques locales et globales ; développements diachroniques). L’aspect sur lequel se concentre la communication présente concerne la place méthodologique de l’étude des cultes royaux dans le débat sur la « polis religion » et l’ « individualisation du religieux » dans le monde gréco-romain. [less ▲]

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See detailTailoring the Properties of Metallic Clusters by Ligand Coatings
Fresch, Barbara ULg

Conference (2014, January 23)

Tuning the properties of metallic clusters using different protecting ligand shells is an important step toward the application-orientated design of nanoparticles for nano-electronics and catalysis. An ... [more ▼]

Tuning the properties of metallic clusters using different protecting ligand shells is an important step toward the application-orientated design of nanoparticles for nano-electronics and catalysis. An attractive property of these materials is the ability to engineer ligand shells composed of different molecules that influence the electronic structure of the system due to their chemical interaction with the metal core. Sometimes properties are not simply additive, and cooperative effects emerge so that the presence of more than one ligand type in the ligand shell imparts novel properties to the nanoparticles. We theoretically investigate at the DFT level palladium and gold metal cores interacting with only-thiol, only-phosphine and mixed phosphine-thiol ligand shells. In this talk, we present some examples of how these capping systems affect structural, optical, magnetic and charging properties of metallic clusters. For Au11 and Au13, we show that ligation stabilizes structural isomers characterized by a flake geometry of the metal core, and they show different optical properties than isomers with a compact gold core. The magnetic ground state of small bare Pd13 clusters is a high spin state, nonet or septet depending on the structural isomer. We demonstrate that interaction with thiols and phosphines differently affect structure and magnetic ground state in these systems. The mixed ligand species Pd13(SCH3)6(PH3)6 shows multiple energetically accessible spin states and consequently an unusual thermal behaviour of the average magnetic moment. The charge transfer character of the metal-ligand interaction is studied in small Pd13 and truly nano-sized Pd55 ligand protected metal cores. We discuss cooperative effects in the ligand induced charge redistribution and demonstrate that the electron donor or acceptor character of the ligand molecules affects the energetics of charging processes [less ▲]

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See detailAspetti prosodici e testuali del raccontare: dalla letteratura orale al parlato dei media
Moreno, Paola ULg; Di Salvo, Margherita

Conference (2014, January 23)

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See detailLosses – Marks&Spencer
Richelle, Isabelle ULg

Conference (2014, January 23)

This conference will explore the history, impact, and potential for further development of the CJEU’s and the EFTA Court’s landmark decisions relating to direct taxation.

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See detailLe Rorschach selon le Système Intégré et le TCI-R : comparaison et intégration
Rentmeister, Daniel; Englebert, Jérôme ULg; Blavier, Adelaïde ULg

Poster (2014, January 22)

Pour cette étude, un double objectif est recherché. Premièrement, nous comparons statistiquement le test de Rorschach selon le Système Intégré de J.E.Exner et le Temperament and Character Inventory – ... [more ▼]

Pour cette étude, un double objectif est recherché. Premièrement, nous comparons statistiquement le test de Rorschach selon le Système Intégré de J.E.Exner et le Temperament and Character Inventory – Revised de R. Cloninger afin de mettre en évidence leurs divergences et convergences. Deuxièmement, à l’aide de cas cliniques, nous discutons de la pertinence de l’intégration des résultats obtenus par ces deux outils en vue d’établir le profil psychologique complet et cohérent d’un individu. Pour la comparaison statistique, notre échantillon de 27 sujets tout-venant (M = 24,37 ans ; SD = 2,75) a d’abord été soumis au test de Rorschach. Directement après, chaque sujet a complété le TCI-R. Une analyse de corrélation (Rho de Pearson) a été calculée entre les indices et un ajustement de Bonferroni a été effectué. Pour l’analyse de cas, 3 sujets cliniques ont été recrutés. Une anamnèse a été réalisée et le test de Rorschach et TCI-R administré. Nos premiers résultats, qui sont à prendre avec prudence au vu du faible nombre de sujet de l’échantillon, sont à nuancer et discuter. À partir de 2016 comparaisons statistiques, nous sélectionnons les résultats les plus pertinents et discutons des différentes corrélations observées. Les analyses de cas nous montrent une concordance au niveau des relations sociales et de l’impulsivité ; et nous montrent que les informations propres à chaque test permettent de compléter le profil du sujet. Enfin, c’est en abordant les deux épistémologies différentes sur lesquelles reposent ces deux tests que nous pouvons expliquer au mieux les différences psychologiques mises en évidence à propos des mêmes individus. Nous concluons en suggérant que cette différence de résultats doit certainement être comprise selon une logique intégrative et souligne la complémentarité existant entre ces deux épreuves. [less ▲]

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See detailLe problème des protocoles longs au test de Rorschach
Dufour, Cristelle; Englebert, Jérôme ULg

Poster (2014, January 22)

Notre étude s’intéresse aux protocoles exceptionnellement longs (supérieurs à 50 réponses) fournis par cinq sujets au test du Rorschach administré et interprété selon la méthode du Système Intégré (Exner ... [more ▼]

Notre étude s’intéresse aux protocoles exceptionnellement longs (supérieurs à 50 réponses) fournis par cinq sujets au test du Rorschach administré et interprété selon la méthode du Système Intégré (Exner, 2003). Afin de mieux comprendre quelle attitude adopter face à ce type de protocole, nous avons effectué une réduction a posteriori du nombre de réponses en nous basant sur les recommandations d’Exner (1988, 1992, 2003). Nous avons ensuite réalisé une étude comparative entre l’interprétation clinique réalisée avec la totalité des réponses et avec seulement les cinq premières réponses par planche. Nous avons également reproduit cette méthodologie de réduction a posteriori du nombre de réponses avec quatre réponses par planche en nous inspirant des nouvelles recommandations du système R-PAS de Meyer et al. (2009). Selon ces propositions, un protocole de test de Rorschach serait valide lorsque le sujet fournit entre 20 et 40 réponses (entre 2 et 4 par planche). L’échantillon est composé de trois sujets tout-venant et deux sujets psychiatriques. Notre analyse a mis en évidence une stabilité de certaines variables (EB, Lambda, EA) mais d’importantes différences dans le profil psychologique des sujets après réduction. Nous avons observé une clarification des difficultés fondamentales chez les sujets psychiatriques et plutôt une neutralisation de ces difficultés pour les sujets tout-venant, avec notamment des stratégies défensives qui apparaissent plus adaptées. Selon les résultats obtenus à partir de notre échantillon, nous pouvons suggérer que la prise en compte de la totalité des réponses ou seulement du protocole partiel induit une différence dans l’interprétation clinique. En conséquence, toute réduction du nombre de réponses devrait se faire avec grande prudence. Notre étude permet de discuter des pratiques actuelles du test de Rorschach, en faisant dialoguer les contraintes inhérentes à la validité du test et les questions de la réduction de la complexité clinique propres à toute entreprise de standardisation. [less ▲]

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See detailArt et schizophrénie : étude comparative de biographies d’artistes d’art brut et de sujets schizophrènes peintres
Moffarts, Aloïse; Englebert, Jérôme ULg

Poster (2014, January 22)

La psychopathologie phénoménologique explique la schizophrénie en termes de perte de l'évidence naturelle (Blankenburg, 1991/1971) ou de psychopathologie du sens commun (Stanghellini, 2000, 2004, 2007 ... [more ▼]

La psychopathologie phénoménologique explique la schizophrénie en termes de perte de l'évidence naturelle (Blankenburg, 1991/1971) ou de psychopathologie du sens commun (Stanghellini, 2000, 2004, 2007). Concernant les théories consacrées à l'art et la psychopathologie, nous nous penchons sur la théorie de la Gestaltung de Prinzhorn (1984), sur l’hypothèse de l’« l'art révolutionnaire » de Sass (1992 ; Spaniol, 2001) et analysons la classification de Jádi (Hulak, 1990). Enfin, à partir de ces travaux, nous avons établi trois types d'art qui peuvent se retrouver chez des artistes malades mentaux : art brut, art naïf et art de recherche. Notre méthodologie consiste à analyser la biographie de deux artistes peintres de la famille de « l'art brut » (Aloïse Cobraz et Adolf Wölfli) en les comparant aux biographies et analyses de cas de deux patients schizophrènes se considérant comme artistes peintres. Nous avons élaboré un questionnaire semi-structuré pour questionner les artistes sur leur parcours artistique et leur rapport à l’art. Après nos analyses et le croisement avec les théories existantes, nous émettons comme hypothèse que les schizophrènes artistes se distinguent des autres types d’artistes (pathologiques ou non) dans leur rapport à la créativité. Ceci est congruent avec le concept d’« art révolutionnaire » de Sass (1992). La classification de Jádi nous permet de suggérer qu’il n’est pas cohérent de parler d’un art des malades mentaux et que le trouble psychiatrique ne peut donc pas être considéré comme l’essence de l'art brut. Enfin, nous pouvons émettre l’hypothèse que l'art semble conférer aux schizophrènes artistes une forme d'adaptation sociale eu égard au sens commun « perdu ». [less ▲]

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See detailEpigenetics and local adaptation
Hanikenne, Marc ULg

Conference (2014, January 22)

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See detailQuantitative approaches based on Surface-Enhanced Raman Scattering (SERS) and Surface-Enhanced Raman Chemical Imaging (SER-CI)
De Bleye, Charlotte ULg; Sacre, Pierre-Yves ULg; Dumont, Elodie ULg et al

Conference (2014, January 20)

Surface-enhanced Raman scattering (SERS), discovered in 1978, is a recent technique enabling to circumvent the main limitations of classical Raman spectroscopy by dramatically exalting the Raman ... [more ▼]

Surface-enhanced Raman scattering (SERS), discovered in 1978, is a recent technique enabling to circumvent the main limitations of classical Raman spectroscopy by dramatically exalting the Raman scattering of the target molecules which are adsorbed or very closed to metallic surfaces while reducing the fluorescence impact on spectra [1]. This technique combines the sensitivity of the fluorescence keeping the structural information of molecules obtained from the SERS spectrum [2]. This last point allows to implement multiplex analyses. Moreover, it is possible to perform Surface-enhanced Raman chemical imaging (SER-CI) analyses which enable to acquire a visual representation of samples combining spectral and spatial measurements. Therefore SERS could become an attractive technique in numerous fields such as pharmaceutical and biomedical research. In this context, the feasibility of developing quantitative approaches using SERS and SER-CI on a pharmaceutical model was studied. The aim was to develop methods allowing the quantification of 4-aminophenol (4-AP) in a pharmaceutical formulation based on paracetamol. 4-AP is the main impurity of paracetamol and is actively research because of its toxicity. This pharmaceutical model was first investigated using SERS and a quantitative method enabling to quantify 4-AP from 3 to15 µg/mL was developed and validated using the standard addition method as a calibration method [3]. From these results, the possibility of developing a quantitative approach using SER-CI was investigated. Tablets based on paracetamol comprising different concentrations of 4-AP were prepared. Different ways to cover the sample surface by the SERS substrate were tested and a homogeneity study was performed to improve the repeatability of SER-CI analyses. Different spectral intensity normalizations were also tested in order to optimize the SER-CI method. Finally, a quantitative approach using SER-CI was developed allowing the quantification of 4-AP from 0.025% to 0.2% (w/w) in paracetamol tablets [4]. This first quantitative approach could pave the way to quantitative analysis of small molecules using SER-CI in complex matrices. References [1] P.L. Stiles, J.A. Dieringer, N.C. Shah, R.P. Van Duyne, Annu. Rev. Anal. Chem. 1 (2008) 601-626. [2] R.F. Aroca, R.A. Alvarez-Puebla, N. Pieczonka, S. Sanchez-Cortez, J.V. Garcia-Ramos, Adv. Colloid Interface Sci. 116 (2005) 45-61. [3] C. De Bleye, E. Dumont, E. Rozet, P.-Y. Sacré, P.-F. Chavez, L. Netchacovitch, G. Piel, Ph. Hubert, E. Ziemons, Talanta 116 (2013) 899-905. [4] C. De Bleye, P.-Y. Sacré, E. Dumont, L. Netchacovitch, P.-F. Chavez, G. Piel, P. Lebrun, Ph. Hubert, E. Ziemons, J. Pharm. Biomed. Anal. (in Press) [less ▲]

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See detailAt which level of vitamin D should we aim?
CAVALIER, Etienne ULg

Conference (2014, January 18)

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See detailSharing the Civic Sacrifice: Between Honorific Portions and Equal Division
Carbon, Jan-Mathieu ULg; Paul, Stéphanie ULg

Conference (2014, January 18)

The granting of a sacrificial portion, much like dinner in the prytaneion (sitesis, deipnon), is one of the major benefits bestowed to recipients of Greek honorific and proxeny decrees, across all regions ... [more ▼]

The granting of a sacrificial portion, much like dinner in the prytaneion (sitesis, deipnon), is one of the major benefits bestowed to recipients of Greek honorific and proxeny decrees, across all regions and periods. Yet the highlighting of an individual over and above his peers runs to some extent counter to his inclusion into a citizenship or another form of civic parity. Various inscriptions attest to this sort of tension, which can in fact be viewed as representative of the dialectic between hierarchy and equality that is characteristic of Greek sacrifice: between gods and priests, for instance, or between priests and other worshippers. These relationships were articulated in all manner of sacrifices and civic feasts, from the offering of a divine portion on the altar or cult-table, to the attribution of priestly and honorific portions of meat which were anatomically related to this divine portion, and finally to the distribution of the remaining meat among the other participants (cp. Ekroth). Several important questions can be raised concerning honorific decrees and similar epigraphic materials: Why was a specific portion sometimes, albeit not usually, granted to honoured individuals in these texts? What did the difference between a generic portion or a priestly portion (a leg, an osphys, etc.) entail concerning the status of these honourees? Did it reflect only a local custom or rather a specific intention by the polis in recognising these individuals? And what were the practical and the conceptual differences between direct participation in a civic feast (such as a demothoinia, the civic banquet par excellence) and the sending (apostellein) of perquisites to honoured individuals absent from the feast? In the end, could a distribution of meat (dais, kreanomia) ever be truly "equal", regardless of what a polis might affirm to the contrary? This paper will explore these questions in a more systematic light than has been shed on them up to the present (Schmitt Pantel, Jacquemin). One of the implications will be a partial reconsideration of the prevalent notion of "equal" division (isomoiria) with regard to Greek sacrificial animals. Despite a rhetorical emphasis on commensality and equal sharing, some individuals in the polis were necessarily "more equal than others". In certain cases, the issue was simply the inclusion of a given honouree within the sacrificial community, while in others, the prerogatives at a feast were used to indicate a special status. From a realistic perspective, one can clearly see that the dialectical tension between sacrificial hierarchy and equality was a tool, which was expressed by the varying forms of commensality in civic feasts, and which could be moulded by the polis to suit its needs. [less ▲]

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See detailDendrochronological analysis of large tropical trees: a new approach combining photogrammetry, image processing and GIS tools
Latte, Nicolas ULg; Bauwens, Sébastien ULg; Bonnet, Stéphanie ULg et al

Conference (2014, January 17)

Tree-ring analysis of tropical trees is especially time-consuming for the largest trees. Because of large dimensions and irregular shapes, the tree-ring measurements are generally achieved (semi-)manually ... [more ▼]

Tree-ring analysis of tropical trees is especially time-consuming for the largest trees. Because of large dimensions and irregular shapes, the tree-ring measurements are generally achieved (semi-)manually directly from wood samples. The aim of this study is to present a new approach of tree-ring measurements combining photogrammetry, image processing and GIS tools that is appropriate for very large wood samples. Disks are sawed from felled trees above buttress. Small diameters holes are drilled to the disk surface to be later used as control points. Images are taken with an off-the-shelf camera and assembled with PhotoScan in order to produce an orthoimage of the green disk surface. After drying, disks are sanded (grain 80-400) and scanned with a flatbed scanner (A3 size) at high resolution (1200-2400 dpi). The scans are then mosaicked together with Autopano into one single image. Based on the control points of the green orthoimage, the ‘dry’ image is georeferenced and rectified. Using a GIS environment, tree-rings are delimited and ring widths and/or areas measured. Disks are entirely digitalized into high resolution images (0.02-0.04mm per pixel) offering a wide range of analysis possibilities. The image-based procedure reduces cost of disk handling and transportation, facilitates data processing and transfer and, is adaptable to any type of wood samples. [less ▲]

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See detailExamens Certificatifs Multimedia, Etude de cas et premier bilan dans le cadre d’un cours de travaux pratiques d’Anatomie
Defaweux, Valérie ULg; Bonnet, Pierre ULg; Schaffer, Patrick ULg et al

Conference (2014, January 17)

L’évaluation assistée par ordinateur se présente, sous ses multiples formes, comme un domaine important d’innovation technique et pédagogique (Winkley, 2010). Ses avantages par rapport aux méthodes ... [more ▼]

L’évaluation assistée par ordinateur se présente, sous ses multiples formes, comme un domaine important d’innovation technique et pédagogique (Winkley, 2010). Ses avantages par rapport aux méthodes traditionnelles ont été bien synthétisés (Boyle, & Hutchison, 2009) et les institutions d’enseignement supérieur s’interrogent sur les façons concrètes de matérialiser ceux-ci aux bénéfices de leurs enseignants et étudiants (JISC, 2007). A l’Université de Liège, les travaux pratiques d’Anatomie en Faculté de Médecine ont tout récemment donné lieu à une réflexion de ce type. Elle s’est soldée par la mise en place d’un nouveau dispositif d’examen. Cette innovation prend place dans le cadre d’un remaniement fondamental du cours, qui trouve son origine dans une augmentation significative du nombre d'étudiants et dans une volonté des enseignants de faire évoluer leurs méthodes pédagogiques. Un point majeur de la réforme a consisté à mettre à disposition des étudiants des ressources numériques inédites (images de scanners, de coupes, de bocaux digitalisés ou vidéos de dissection) et d’intégrer celles-ci à un parcours de formation revisité tant sur le plan des séances en présentiel que des possibilités de travail en autonomie. Ces changements ont entrainé la mise en oeuvre d’un dispositif d’examen sur écrans, conçu pour garantir la cohérence entre la manière d'évaluer, les méthodes d’apprentissage, les ressources manipulées et les objectifs revisités. La communication présentera les aspects techniques et pédagogiques de la nouvelle modalité d’examen, la situera dans le contexte général des travaux pratiques d’anatomie et suggèrera des pistes d’amélioration possibles, en s’appuyant notamment sur le feedback collecté, via un questionnaire, auprès des étudiants. [less ▲]

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See detailPsychogériatrie : à la croisée entre gériatrie et psychiatrie
Adam, Stéphane ULg; Schuerch, Mike ULg; PETERMANS, Jean ULg

Conference (2014, January 16)

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See detailEvaluation of pitch accuracy: from occasional to operatic singers
Larrouy, Pauline ULg; Nowak, Marion; Roig-Sanchis, Virginie et al

Conference (2014, January 15)

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See detailDendroecology and Dendroclimatology of a Tasmanian Bog Forest
Balanzategui, Daniel; Copenheaver, Carolyn; Frank, David et al

Poster (2014, January 14)

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See detailSelves Impairment in Bipolar Disorder through Self-Concept Clarity, Self-Defining Memories and Self-Esteem
Wagener, Aurélie ULg; Boulanger, Marie ULg; Van Limbergen, Coralie et al

Poster (2014, January 13)

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See detailDepression and autobiographical memory: which are the characteristics of depressed patients' self-defining memories?
Wagener, Aurélie ULg; Weigend, Alicia; Boulanger, Marie ULg et al

Poster (2014, January 13)

BACKGROUND. Depressed patients suffer from autobiographical memory deficits. Indeed, depressed patients present an overgeneralization and a mood congruence biases. Moreover, they seem to have difficulties ... [more ▼]

BACKGROUND. Depressed patients suffer from autobiographical memory deficits. Indeed, depressed patients present an overgeneralization and a mood congruence biases. Moreover, they seem to have difficulties to recall positive memories. Our aim is to focus on a specific kind of memories called “self-defining memories” (SDM) which are highly pertinent for self-building. Their characteristics (e.g. specificity, meaning making) were assessed and compared to those of healthy subjects. HYPOTHESES. Depressed patients relate less specific and meaning making events than control group. A mood congruence bias is observed. METHOD. 17 depressed patients and 18 healthy subjects fulfilled SDM exercises: subjects were asked to relate six important events that happened in their life. These SDM were assessed on several variables: specificity, impact, meaning making, contain. Moreover, subjects were assessed on depression severity and self-esteem (explicit and implicit). RESULTS. No difference between depressed patients and healthy subjects has been found for specificity. A marginal effect appeared for meaning making: control group seemed to relate more meaning making events than depressed patients. Depressed patients related more negative events than control group: this negative emotional valence was positively correlated with higher depression severity. Depressed subjects presented a lower explicit self-esteem than healthy subjects but no difference has been found for implicit self-esteem. Higher explicit self-esteem was positively correlated with positive emotional valence of SDM. DISCUSSION. Results partially support our hypotheses. Experimental and clinical implications of our results will be discussed. [less ▲]

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