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See detailExploration des relations entre les capacités sémantiques et le manque du mot chez la personne âgée saine
Verhaegen, Clémence ULg; Poncelet, Martine ULg; Kaivers, Vinciane

Poster (2010, September)

Le manque du mot (ou anomie) est une plainte langagière fréquente chez le sujet âgé. Les facteurs cognitifs qui y contribuent et l’âge auquel il apparaît sont cependant controversés (Mortensen et al ... [more ▼]

Le manque du mot (ou anomie) est une plainte langagière fréquente chez le sujet âgé. Les facteurs cognitifs qui y contribuent et l’âge auquel il apparaît sont cependant controversés (Mortensen et al., 2006). Selon Barresi et al. (2000), l’anomie serait liée à une dégradation des représentations sémantiques chez les personnes de plus de 70 ans, les erreurs de dénomination d’images commises par celles-ci étant consistantes contrairement à celles observées chez les personnes de 50-60 ans. Le but de cette étude est de déterminer l’âge d’apparition de l’anomie et d’examiner plus directement les liens entre celle-ci et les capacités sémantiques chez la personne plus âgée. Nous avons évalué les capacités de dénomination d’images d’objets (issues de Bonin et al., 2003) ainsi que de jugement de synonymie et d’association sémantique d’images de trois groupes (N=19-18-19) de personnes saines (score>137 à l’échelle de Mattis), âgés respectivement de 25-35 ans, 50-60 ans et plus de 70 ans. Des ANOVA sur les réponses correctes et les temps de réponse en dénomination d’images révèlent un effet de groupe (respectivement, F(2,53)=21.76, p<.001 et F(2,53)=53.29, p<.001). Les personnes de plus de 70 ans sont plus lentes et commettent plus d’erreurs que les personnes de 50-60 ans et de 25-35 ans qui ne diffèrent pas entre elles. Un effet de groupe apparaît également dans les tâches de jugement de synonymie (F(2,53)=24.71, p<.001) et d’association sémantique (F(2,53)=15.40, p<.01). Les personnes de plus de 70 ans présentent des performances à ces tâches inférieures à celles des deux autres groupes d’âge, égaux entre eux. Cette étude montre que les capacités de dénomination sont altérées chez les personnes de plus de 70 ans mais pas de 50-60 ans et appuie la conception selon laquelle cette altération pourrait être liée à une dégradation des représentations sémantiques chez les personnes plus âgées. [less ▲]

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See detailPrediction of genetic interactions in yeast using machine learning
Schrynemackers, Marie ULg

Poster (2010, September)

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See detailFaux souvenirs et traitement hémisphérique dans le vieillissement.
Gajewski, Celine; Dehon, Hedwige ULg; Peigneux, Philippe ULg et al

Poster (2010, September)

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See detailNear-Death Experiences : Real or imagined memories?
Thonnard, Marie ULg; Laureys, Steven ULg; Brédart, Serge ULg et al

Poster (2010, September)

Detailed reference viewed: 91 (11 ULg)
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See detailDevelopment of an immobilisation device for treatment of patients after breast conserving surgery for mammary carcinoma.
COUCKE, Philippe ULg; WONNER, Michel ULg; JANVARY, Zsolt Levente ULg et al

Poster (2010, September)

To develop an immobilisation device for prone positioning for breast irradiation. The basic requirements for the device are: rapid and accurate patient (re)positioning, compatibility with modern imaging ... [more ▼]

To develop an immobilisation device for prone positioning for breast irradiation. The basic requirements for the device are: rapid and accurate patient (re)positioning, compatibility with modern imaging devices and easy to handle by the treating technologists. [less ▲]

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See detailCotoneaster horizontalis on calcareous grasslands in Belgium : from ornament to management
Frisson, Gwenn ULg; Piqueray, Julien ULg; Halford, Mathieu ULg et al

Poster (2010, September)

Cotoneaster horizontalis DECAISNE, a Rosaceae coming from Asia, was introduced in Belgium as an ornamental species. Different sides of the invasion were studied, from the distribution of the species and ... [more ▼]

Cotoneaster horizontalis DECAISNE, a Rosaceae coming from Asia, was introduced in Belgium as an ornamental species. Different sides of the invasion were studied, from the distribution of the species and the invasion status, the impacts, to management methods. To describe the invasion status, information was gathered about the occurrence and the distribution of the species in Belgium by compiling various databases. The naturalization status in calcareous grasslands, high-value habitats recognized as biodiversity hotspots, was assessed. Occurrence, population status, preferred habitats, invaded communities, growth rate and fruiting capacity were characterized. Once naturalization established, we investigated its impacts on calcareous grasslands communities, individual species and pollinators. C. horizontalis occurred in seven of the nine studied calcareous grasslands, with densities from 0.34 to 10 individuals/ha. In the most invaded sites, an ongoing colonization process was suggested by a high proportion of small individuals. Moreover, 3-year-old individuals already showed fruiting capacities. Germination rate reached about 30%. Significant impacts on habitat structure and vegetation were showed. Community structure and composition changes were demonstrated in invaded sites by decreasing species richness and diversity. As calcareous grasslands are priority Natura2000 habitats, measures must be taken to control the spread of C. horizontalis. For this purpose, we performed management tests to identify the most efficient techniques that would help the restoration of calcareous grasslands. Both mechanical and chemical management techniques were tested. Methods choice was driven by the environmental constraints of calcareous grasslands, which require highly selective techniques, and by species characteristics. Tested methods were cuttings, stump burning, spraying, cutting plus glyphosate application on stump and glyphosate application on stem basis. Efficiency, cost, feasibility and side-effects on ecosystems were estimated. Management tests are still ongoing but some results have already been drawn: spraying and single cutting are not efficient, the last one generating production of numerous sprouts. Finding the best management method will not be sufficient to stop the invasion. C. horizontalis is still present in 53% of the sale catalogs of horticulturists in Southern Belgium. As long as the species is used in the vicinity of calcareous grasslands, propagules are continuously provided, jeoparding management actions. [less ▲]

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See detailCan we really get rid of Japanese knotweed clones? Two years of management tests in Belgium
Monty, Arnaud ULg; Delbart, Emmanuel ULg; Mahy, Grégory ULg et al

Poster (2010, September)

Japanese knotweed Fallopia japonica is an extremely abundant invasive plant in Belgium and surrounding countries. To date, no eradication method is available for managers facing the invasion of this ... [more ▼]

Japanese knotweed Fallopia japonica is an extremely abundant invasive plant in Belgium and surrounding countries. To date, no eradication method is available for managers facing the invasion of this rhizomatous plant. We tested different chemical herbicides and two application methods (spraying and stem injection), as well as mechanical treatments, on Fallopia clones throughout southern Belgium. The tested methods were selected to be potentially usable by Belgian managers, e.g. using legally accepted rates for herbicides. Stem volume, height and density reduction was assessed after one or two years depending on the treatment. No tested method allowed a complete eradication of the clone. However, stem injection with glyphosate-based herbicide caused the highest damage. The year following injection, no sprouts were observed. Two following year, however, stunted shoots sprouted. Among mechanical control measures, repeated cuts combined with native trees cuttings plantations most appreciably reduced knotweed development. The most efficient methods we tested appear as tools for curbing knotweed invasion but are not likely to be used to eradicate the species. As such they should be included in a more integrated control strategy, together with prevention and public awareness campaigns. [less ▲]

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See detailEcology and evolution of invasive plants: what to study next?
Monty, Arnaud ULg; Brown, Cynthia; Tepolt, Carolyn et al

Poster (2010, September)

In recent decades, a growing number of studies have addressed connections between ecological and evolutionary concepts in biologic invasions. These connections may be crucial for understanding the ... [more ▼]

In recent decades, a growing number of studies have addressed connections between ecological and evolutionary concepts in biologic invasions. These connections may be crucial for understanding the processes underlying invaders’ success. However, the extent to which scientists have worked on the integration of the ecology and evolution of invasive plants is poorly documented, as few attempts have been made to evaluate these efforts in invasion biology research. Such analysis can facilitate recognize well-documented relationships and identify gaps in our knowledge. In this study, we used a network-based method for visualizing the connections between major aspects of ecology and evolution in the primary research literature. Using the family Poaceae as an example, we show that ecological concepts were more studied and better interconnected than were evolutionary concepts. Several possible connections were not documented at all, representing knowledge gaps between ecology and evolution of invaders. Among knowledge gaps, the concepts of plasticity, gene flow, epigenetics and human influence were particularly under-connected. We discuss five possible research avenues to better understand the relationships between ecology and evolution in the success of Poaceae, and of alien plants in general. [less ▲]

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See detailWhich evolutionary mechanisms allow Senecio inaequidens DC. to face a changing climate? A synthesis
Monty, Arnaud ULg; Mahy, Grégory ULg

Poster (2010, September)

Plant populations are expected to face gradual climatic variation in the next decades. Understanding and quantifying evolutionary and non-evolutionary mechanisms allowing populations response to climate ... [more ▼]

Plant populations are expected to face gradual climatic variation in the next decades. Understanding and quantifying evolutionary and non-evolutionary mechanisms allowing populations response to climate is therefore crucial to anticipate the actual consequences of climate change on plants. However, studying the direct effects of climate change in wild populations is of little anticipating interest… there invasive plants can help! We studied the sources of phenotypic variation in populations that gradually invaded different climatic zones over the last century, and assessed the role of local adaptation, non-adaptive genetic differentiation, phenotypic plasticity and environmental maternal effects in plant population response to climate. [less ▲]

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See detailScience with the Carlina hypertelescope
Le Coroller, H.; Dejonghe, J.; Regal, X. et al

Poster (2010, September)

Studies are currently underway to propose a generation of post-VLTI interferometers (Carlina, OHANA, Keops, etc.). Such interferometers will open new fields of research in astrophysics by imaging the ... [more ▼]

Studies are currently underway to propose a generation of post-VLTI interferometers (Carlina, OHANA, Keops, etc.). Such interferometers will open new fields of research in astrophysics by imaging the surfaces of supergiant stars, gravitational microlensing, AGN, Hot Jupiters, etc. To achieve these goals, they will have to respond to several criteria: to provide very high angular resolution (baselines > 100 m), to be equipped with a large number of mirrors (rich UV coverage), and to be able to accommodate high tech instrumentation such as an Adaptive Optics system and a coronagraph. We describe the optical Carlina architecture and show that it fulfills all these criteria. We give new results obtained with the prototype of Carlina currently built at Observatoire de Haute-Provence. Considering its expected specifications, Carlina will operate in complementarity with ELTs and very long baseline interferometers. [less ▲]

Detailed reference viewed: 40 (10 ULg)
See detailThe influence of climate on hillslope sediment supply : Insights from numerical modeling
Bovy, Benoît ULg; Demoulin, Alain ULg; Braun, Jean

Poster (2010, September)

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See detailSynovium angiogenesis in osteoarthritis: a new therapy target for chondroitin sulfate
Mathy, Marianne ULg; Lambert, Cécile ULg; Dubuc, Jean Emile et al

Poster (2010, September)

Osteoarthritis (OA) is an important cause of pain and disability in the ageing population. Angiogenesis and inflammation are closely integrated process in OA and may contribute to its pathogenesis, as ... [more ▼]

Osteoarthritis (OA) is an important cause of pain and disability in the ageing population. Angiogenesis and inflammation are closely integrated process in OA and may contribute to its pathogenesis, as well as, affect disease progression and pain. Chondroitin sulfate (CS) is a symptomatic slow acting drug for OA and there is strong evidence suggesting that CS may also be a structure disease modifying osteoarthritis drug. The mechanisms underlying these effects remain poorly understood. This work aimed to demonstrate the relation between inflammation and angiogenesis of synovium and to study the effect of CS on synovium angiogenesis. [less ▲]

Detailed reference viewed: 38 (2 ULg)
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See detailExperience feed back committee (EFBC) in radiotherapy
DELGAUDINE, Marie ULg; JANSEN, Nicolas ULg; COUCKE, Philippe ULg

Poster (2010, September)

Radiotherapy is a powerful continuously evolving effective treatment tool. Our aim is to offer the best treatments and assure security for patients and personnel. A proactive quality approach copied from ... [more ▼]

Radiotherapy is a powerful continuously evolving effective treatment tool. Our aim is to offer the best treatments and assure security for patients and personnel. A proactive quality approach copied from the one implemented in the air transport industry has been established in our department. An Experience feed back committee (EFBC) has been set up to identify, record and analyze systematically all reported precursor events. Our final objective is to test and strengthen the security of the organization and the quality of care for patients. [less ▲]

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See detailContribution to fight against counterfeit medecines applying several analytical tools
Marini Djang'Eing'A, Roland ULg; Mbinze Kindenge, Jérémie; Montes, M. L. A. et al

Poster (2010, September)

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See detailOptimisation and validation of a fast HPLC method for the quantitation of sulindac and its impurities
Krier, Fabrice ULg; Brion, Michaël; Debrus, Benjamin ULg et al

Poster (2010, September)

Detailed reference viewed: 135 (43 ULg)
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See detailImpact of ageing and food additives on the physico-chemical properties of partially hydrolyzed and pregelatinized rice flour
Mertens, Cécile ULg; Blecker, Christophe ULg

Poster (2010, August 25)

Conservation of the quality of a food product is an essential preoccupation for industrials. Indeed, food acceptability by consummers depends of this quality. However, the latter decreases with time of ... [more ▼]

Conservation of the quality of a food product is an essential preoccupation for industrials. Indeed, food acceptability by consummers depends of this quality. However, the latter decreases with time of storage, due to complex alteration reactions. This study presents a first approach of alteration reactions in a particular range of products: drum-dried pregelatinized cereal products. While this type of product is widely used as thickeners or in infant foods, no study has ever been made on the subject. The cereal studied here is one of the most consumed by mankind: rice. We also investigated the impact of food additives (E170 & E340ii) on the ageing of such a product, because they are often used empirically in industry. [less ▲]

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See detailLiposomes loaded with diglyceride esters of methotrexate and mephalan studies on stability and hemocompatibility
Kuznetsova, N; Kandyba, A.K; Bovin, N et al

Poster (2010, August 24)

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See detailInfluence of steam explosion and thermal degradation of cellulose
Jacquet, Nicolas ULg; Quiévy, Nicolas; Vanderghem, Caroline ULg et al

Poster (2010, August 20)

The aim of the present work is to compare the effect of different steam explosion pretreatments on the thermal degradation of a bleached cellulose where components like hemicelluloses and lignin have ... [more ▼]

The aim of the present work is to compare the effect of different steam explosion pretreatments on the thermal degradation of a bleached cellulose where components like hemicelluloses and lignin have already been removed by acid and alkaline treatments. The results of this study show that thermal degradation of cellulose fibres, studied by TGA, is still limited for a temperature process below 240 °C. However, derivative TGA show that thermal stability of cellulose obtained by these conditions decreases with the increase of temperature. For temperatures above 250°C, char level is higher at the end of the pyrolysis. According to the literature, the increase of the char level is correlated to an increase of the degradation product1. Determination of the degradation products in the liquor obtained after the pretreatment show an important increase of furfural and 5-hydroxymethylfurfural concentration with the temperature in agreement with the increase of the char level. These results confirm the important degradation of the cellulose fibres. [less ▲]

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See detailCan we predict troubles during horse clinical examination by a simple test?
Peeters, Marie ULg; Godfroid, Sandra; Sulon, Joseph et al

Poster (2010, August 03)

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See detailEstimation of Genetic Parameters for Test Day Milk Yields of Moroccan Holstein Cows Using Random Regression Test Day Model
Tijani, Aziz; Rgayai, Brahim; Hammami, Hedi ULg et al

Poster (2010, August 02)

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See detailDo aphids and their predators use the same OBP to transport a same odour?
Vandermoten, Sophie ULg; Fan, Jia; Liu, Yong et al

Poster (2010, August)

Detailed reference viewed: 37 (1 ULg)
See detailICT Challenges in Belgian Businesses: an overview
Lisein, Olivier ULg

Poster (2010, August)

Detailed reference viewed: 43 (9 ULg)
See detailThe impact of diet in shaping microbiota revealed by a comparative study in children from Europe and Rural Africa
De Filippo, C.; Di paola, M.; Ramazzotti, M. et al

Poster (2010, August)

Detailed reference viewed: 16 (1 ULg)
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See detailWear study on polymers and bio-materials by ultra thin layer activation
Delhalle, René ULg; Marchal, André ULg; Lucas, S. et al

Poster (2010, August)

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See detailInvolvement of odorant cues in the process of superparasitism avoidance
Vandermoten, Sophie ULg; Frere, Isabelle; Hance, Thierry et al

Poster (2010, August)

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See detailFemale fertility expression in Walloon dairy cattle
Vanderick, Sylvie ULg; Bastin, Catherine ULg; Gengler, Nicolas ULg

Poster (2010, August)

A useful method to express female fertility of the Walloon dairy cattle using direct and indirect female fertility information was considered. Data were based on results of the genetic evaluation of ... [more ▼]

A useful method to express female fertility of the Walloon dairy cattle using direct and indirect female fertility information was considered. Data were based on results of the genetic evaluation of pregnancy rate for 606,328 Holstein cows and on INTERBULL proofs of female fertility for 88,496 bulls. A direct female fertility index (DFF), using INTERBULL proofs, was developed from results of a principal component analysis carried out on 6 published foreign female fertility indexes. An indirect female fertility index (IFF) was also developed from ten other traits evaluated in Walloon Region. Theory of selection index was used to combine DFF and IFF in a global index called combined female fertility index (CFF). This index allowed young bulls to have better reliabilities with an average increase of 12% leading to extra 4,019 of publishable bulls for female fertility. [less ▲]

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See detailFirst-Principles Study of Oxidation Mechanism for SiC-based Materials
Xu, Bin ULg; Kroll, Peter

Poster (2010, August)

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See detailHammett Acidity Scale in Ionic Liquids : An Indication of Their Weak Dissociating Character
Robert, Thierry ULg; Magna, Lionel; Olivier-Bourbigou, Hélène et al

Poster (2010, August)

Ionic liquids are salts with the particularity to exhibit melting points near room temperature (below 100°C, by convention) with no vapour tension. For this last reason, ionic liquids are sometimes called ... [more ▼]

Ionic liquids are salts with the particularity to exhibit melting points near room temperature (below 100°C, by convention) with no vapour tension. For this last reason, ionic liquids are sometimes called “green solvents”. In addition, their exclusive materials and solvent properties has led to an amazing increase of interest from both academic and industrial community, confirmed by the explosion of the number of published papers in the last decade. The many combinations of organic and inorganic cations and anions allow an infinity of new ionic solvents then permitting the selection of the desired properties for a given application. Nevertheless, it is impossible to investigate all these combinations and the unusual complexity of these new solvents gives rise to many controversies. Consequently, the development of the general rules for understanding the chemistry in ionic liquids is crucial. A fundamental property of solvent is its solvating power, for instance towards the proton. Therefore, we are interested to investigate the acid-base properties in ionic liquids in order to ultimately find a correlation with the acidic catalysis activity. We then have proposed a colorimetric method to determine the acidity levels accessible in these new media: the Hammett acidity function H0. This spectroscopic method is based on the protonation equilibrium for a family of coloured indicator with pKa’s assumed as solvent independent (following the Hammett proposition). This presentation will summarize our Hammett acidity measurements in several ionic liquids. - At first, we will show that it is possible to evaluate the Hammett acidity function with two different coloured indicators, in the same ionic liquid. Since the Hammett acidity of a given mixture was found to depend on the choosen coloured indicator, this suggests the formation of ions associations in ionic liquids. As a result, the ionic liquids are clearly not as dissociating as initially thought and the Hammett acidity function is in fact an apparent function, underestimating the real acidity level. - The apparent acidity functions have then been compared for several ionic liquids to which an acid has been added ([BMIm][NTf2], [BMIm][BF4], [BMIm][OTf], [BHIm][NTf2], [BMIm][PF6], [HNEt3][NTf2]). The conclusions are as follows: 1) the accessible acidity level is not influenced by the nature of the cation; 2) on the contrary, the nature of anion is very critical and the solvating power towards the proton follows the order: OTf- > NTf2- > BF4- > PF6-. The more the proton is solvated, the less it is acidic. - Finally, the difference of acidity of two acids, HOTf and HNTf2 (both strong acids in water), has been investigated in [BMIm][BF4], [BMIm][NTf2] and [BMIm][OTf]. In [BMIm][OTf], these two acids show the same acidity (they behave as strong acids) due to the solvent levelling effect; on the other hand, in [BMIm][NTf2] and [BMIm][BF4] allowing higher acidity levels, HNTf2 is stronger than HOTf . The observed difference is also another indication of the lower proton solvation in [BMIm][BF4] or [BMIm][NTf2] versus that in [BMIm][OTf]. [less ▲]

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See detailTransport and interaction blockade of cold bosonic atoms in a triple-well potential
Schlagheck, Peter ULg; Malet, Francesc; Cremon, Jonas C. et al

Poster (2010, August)

We investigate the transport properties of cold bosonic atoms in a triple-well potential that consists of two large outer wells, which act as microscopic source and drain reservoirs, and a small inner ... [more ▼]

We investigate the transport properties of cold bosonic atoms in a triple-well potential that consists of two large outer wells, which act as microscopic source and drain reservoirs, and a small inner well, which represents a quantum-dot-like scattering region. Such configurations can be realized by optical triple-well lattices generalizing the setup realized in the interaction blockade experiment by Cheinet et al. [Phys. Rev. Lett. 101, 090404 (2008)]. Bias and gate "voltages" are introduced in order, respectively, to tilt the triple-well configuration and to shift the energetic level of the inner well with respect to the outer ones. By means of exact diagonalization considering a total number of 6 atoms in the triple-well potential, we find diamond-like structures for the occurrence of single-atom transport in the parameter space spanned by the bias and gate voltages, in close analogy with the Coulomb blockade in electronic quantum dots. We demonstrate how one can infer the interaction energy in the central well from the distance between the diamonds, and discuss the possibility of realizing single-atom pumping across the quantum dot. [less ▲]

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See detailFungal gene expression in a forest soil
Kellner, Harald ULg; Portetelle, Daniel ULg; Vandenbol, Micheline ULg

Poster (2010, August)

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See detailInvolvement of odorant cues in the process of superparasitism avoidance
Verheggen, François ULg; Vandermoten, Sophie ULg; Frere, Isabelle et al

Poster (2010, August)

The ability to avoid superparasitism provides a selective advantage to parasitoid females, allowing them to avoid depositing eggs in lower quality host. We observed in a Y-olfactometer that generalist ... [more ▼]

The ability to avoid superparasitism provides a selective advantage to parasitoid females, allowing them to avoid depositing eggs in lower quality host. We observed in a Y-olfactometer that generalist aphid parasitoids, Aphidius ervi and Aphidius rhopalosiphi (Hymenoptera, Braconidae), were more attracted toward non-parasitized than parasitized Sitobion avenae (Hemiptera, Aphididae) colonies. We collected the odors released from healthy aphids and aphids parasitized for 2 and 6 days using an electronic nose. Sitobion avenae alarm pheromone, (E)-ß-farnesene (EßF), was the only chemical identified, and was found in lower quantities in parasitized aphids. Both parasitoid species provided pronounced electrical depolarizations to EßF in electroantennography (EAG), and both were attracted to the latter compound in the Y-olfactometer. Parasitoid attraction was known to be guided by a variety of odorant cues released by plants and hosts, and our results support the hypothesis that the aphid alarm pheromone acts as a kairomone for A. ervi and A. rhopalosiphi. [less ▲]

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See detailChilling of heavy carcasses from double muscled cattle: time-temperature evolution and predictive modelling of growth of Listeria monocytogenes and Clostridium perfringens
Delhalle, Laurent ULg; Collignon, Bertrand; Dehard, Sandrine ULg et al

Poster (2010, August)

The time/temperature combination during carcass chilling is of concern in order to avoid bacterial growth. The chilling speed is lower in carcasses with high muscular development such as large cattle from ... [more ▼]

The time/temperature combination during carcass chilling is of concern in order to avoid bacterial growth. The chilling speed is lower in carcasses with high muscular development such as large cattle from the Belgian Blue breed. Three slaughterhouses were selected for temperature and pH measurements during the chilling process at 6 different days on 4 half carcasses in order to obtain representative data from heavy carcasses with high muscular development. Predictive microbiology was used to evaluate the potential growth of Listeria monocytogenes and Clostridium perfringens on the surface and in the depth of the carcasses. The gamma concept was chosen as secondary model taking into account the effect of temperature, pH and water activity on the selected bacteria during the chilling process. The predicted growth potential of Listeria monocytogenes is influenced by the different environmental conditions of the selected slaughterhouses and could reach 1.4 log CFU/cm² after the chilling process. The potential growth of Clostridium perfringens is limited due to unfavourable conditions during the first hours and to low temperature later. It can be concluded that when the initial level of contaminating bacteria is not excessive the speed at which the carcass is currently chilled is sufficient to limit the growth of these two pathogens and to ensure the product quality [less ▲]

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See detailProcessing of linguisitic and musical dimensions contained in songs : effects of an expertise
Larrouy, Pauline ULg; Leybaert, Jacqueline; Kolinsky, Régine

Poster (2010, August)

Songs are universal in our lives and also offer an ecological material that links linguistic and musical information. It therefore provides a tool for observing the relationship between music and language ... [more ▼]

Songs are universal in our lives and also offer an ecological material that links linguistic and musical information. It therefore provides a tool for observing the relationship between music and language. To examine the specificity of language and music information processing in songs, we studied the influence of expertise (i.e. musicians or speech therapists) on the use of transitional probabilities (TPs) in learning an artificial language (AL) either spoken or sung. This type of implicit statistical learning is especially important in language development (Saffran, Aslin, & Newport, 1996). We used the paradigm designed by Schön, Boyer, Moreno, Besson, Peretz and Kolinsky (2008). These authors have demonstrated the benefit of structural and motivational proprieties of music contained in the song in the learning process of AL in individuals with no expertise. Compared to a spoken AL, learning was enhanced for a singing AL, especially when the TPs of musical and linguistic materials were congruent. Our results did not replicate those of this study in participants having no music expertise. However, an interaction occurred between the type of AL and expertise of the participants. Indeed, only music experts seemed to benefit from the congruence between the TPs of musical and linguistic materials in extracting TP-based linguistic units. On the opposite, experts in language seemed to be favoured by the incongruence between the TPs of linguistic and musical information. These results are discussed in relation to the notions of the specificity of processing of lyrics and tunes in songs. [less ▲]

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See detailImpacts of growth development and age at first calving on first lactation yield in Holstein dairy cows
Picron, Pascale ULg; Froidmont, Eric; Turlot, Amélie et al

Poster (2010, August)

In a context of economic constraints, reducing the herd replacement costs represents a way to improve the economic efficiency of the dairy sector. Studies reported that heifers calving between 23 and 24.5 ... [more ▼]

In a context of economic constraints, reducing the herd replacement costs represents a way to improve the economic efficiency of the dairy sector. Studies reported that heifers calving between 23 and 24.5 mo of age achieved the highest economic return. However, the heifer has to be well developed to guarantee milk performance, calving ease and low stillbirth rate. Monitoring growth, by Heart Girth (HG) measurements, constitute a convenient way to evaluate the feasibility to inseminate heifers early. The aim of this study was to analyse the relationship between HG, age at first calving and milk production at first lactation. HG measurements of 704 Walloon (Belgium) Prim Holstein heifers have been recorded, every 3 months, during 2 years (2006 – 2008). The impact of development, at key-ages (from 3 to 24 mo, every 3 mo), on age at first calving and first lactation yield, was determined using analysis of variance. Mean total milk production in February 2010 (n = 319) rose to 7686 ± 1388 l/365 days of lactation, for a mean age at first calving (n = 421) of 27.4 ± 3.5 mo. These preliminary results suggest a positive correlation between growth performances and first calving age. Heifers with a better conformation (HG > 2.5 % of the French reference) calved significantly earlier than smaller animals. For instance, a lack of conformation at 15 mo implied a delay at first calving of 4.1 mo of age. HG measurement should therefore constitute a preferential tool of management of heifers herd. First lactation yield was significantly higher (950 l/365 d) for heifers calving older (> 30 mo) comparatively to early calving animals (24 mo). These results do not correspond to those related to larger samples in Wallonia. No significant relation could state, at this time, a direct relation between growth development and first lactation yield. Lactation data are still collected to complete this study. [less ▲]

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See detailComparison of MRI images obtained at 7T in a dog to macroscopic and histopathological examination
Van Thielen, B.; Visser, F.; Denolin, V. et al

Poster (2010, July 20)

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See detailProteomic evolution of s.cerevisiae during chronological aging
Blomme, Arnaud ULg; Mac Cord, Allan ULg; Sluse, Francis ULg et al

Poster (2010, July 19)

Opposite to the replicative aging, which refers to the exponential decline in the capacity of a single cell to divide, chronological aging of the yeast Saccharomyces cerevisiae refers to the time period a ... [more ▼]

Opposite to the replicative aging, which refers to the exponential decline in the capacity of a single cell to divide, chronological aging of the yeast Saccharomyces cerevisiae refers to the time period a yeast cell can survive in a non-dividing state. In 2006, Allen and co-workers reported that yeast cells evolve into two cell types during stationary phase: a high density population defined as quiescent cells (Q) and a low density population defined as non-quiescent (NQ) cells. These two populations mainly differ by their viability, measured as the ability to form colonies when platted on Petri dishes, and can be separated by differential centrifugation on density gradient. In this work, we used the quantitative proteomics technique of 2DDIGE (two Dimensional Differential In-Gel Electrophoresis) to compare the evolution of the yeast cellular soluble proteome during chronological aging. We also checked the impact of the carbon source on stationary-phase cell differentiation. As the ratio of Q/NQ cells is decreasing with time, we have selected three distinct periods: 0 day (32h after outset of yeast culture on glucose, 100% of Q cells), 7 days (50% of Q cells) and 14 days (100% of NQ cells) to realize 3 proteomics comparisons (fig 1). [less ▲]

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See detailEffects of dietary methylmercury on the Zebrafish (Danio rerio) liver proteome
Brésart, David ULg; Fourdrilis, Séverine; Mathy, Grégory ULg et al

Poster (2010, July 19)

Methylmercury (MeHg) is an aquatic pollutant. It is produced from HgS by the action of sulphate-reducing bacteria and is released in fresh waters. MeHg is bioaccumulated through the trophic chain and is ... [more ▼]

Methylmercury (MeHg) is an aquatic pollutant. It is produced from HgS by the action of sulphate-reducing bacteria and is released in fresh waters. MeHg is bioaccumulated through the trophic chain and is known to cause different health troubles (trembling, memory loss, anemia and kidney deficiency). Toxic exogenous substances, such as MeHg, are transformed by liver’s metabolic pathway, making this the starting point of vertebrate detoxication. Almost 50% of MeHg assimilated in hepatocytes is accumulated in mitochondria (Ware et al.,1975) and It has been suggested that it may uncouples OXPHOS (Mori et al., 2007). The aim of this study was to identify the proteomics modifications of the liver mitochondrial proteome in response to a chronic MeHg intoxication by using the 2D DIGE methodology (Figure 1). Fishes were fed with two different contaminated diets (6.5 and 13.5 µg of MeHgCl / g of dry food.). We have also performed functional assays in order to confirm the MeHg uncoupling effect on Salmo truita liver mitochondria. [less ▲]

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See detailRole of Keratinocytes GPR109A and COX-2 in Nicotinic Acid and Mono-methyl Fumarate Induced Flushing
Hanson, Julien ULg; Gille, Andreas; Zwykiel, Sabrina et al

Poster (2010, July 17)

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See detailEFFECTIVENESS OF VOICE THERAPY RELYING ON THE USE OF EUTONY IN THE TRAITEMENT OF DYSPHONIC PATIENTS.
Martinot, Gisèle; Caner, Jessie; Morsomme, Dominique ULg

Poster (2010, July 15)

Twenty six patients with dysphonia (different etiologies) were submitted to a voice therapy program involving the use of Eutony. In order to assess its efficacy, pre and post-treatment audio recordings ... [more ▼]

Twenty six patients with dysphonia (different etiologies) were submitted to a voice therapy program involving the use of Eutony. In order to assess its efficacy, pre and post-treatment audio recordings were analysed and submitted to perceptual rating using GRBAS-I scale and acoustical analysis of fundamental frequency, jitter and shimmer. Aerodynamic data (Maximum Phonation Time & Estimated Subglottic Pressure) were also included in the voice quality assessment protocol. In addition , a questionnaire was sent to all patients to collect self-evaluation of voice quality and therapy outcomes. The study revealed a significant improvement lasting in time for two acoustic parameters : Jitter and Shimmer and five perceptual parameters : Grade, Roughness, Breath, Asthenia and Strain. Aerodynamic data showed slight improvements but no significant changes. Self evaluation questionnaires also tend to strengthen positive effects of therapy. Thus, this study supports the use of Eutony in vocal therapy for dysphonia. Its effects were shown to be measurable with both acoustical analysis and perceptual rating of voice quality. [less ▲]

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See detailContribution of "click chemistry" to the macromolecular engineering of aliphatic polyesters
Riva, Raphaël ULg; Schmeits, Stephanie ULg; Croisier, Florence ULg et al

Poster (2010, July 13)

In this work, click chemistry was sucessfully applied to the chemical modification of aliphatic polyesters with the purpose to tailor their physical properties. The developped strategy was then applied to ... [more ▼]

In this work, click chemistry was sucessfully applied to the chemical modification of aliphatic polyesters with the purpose to tailor their physical properties. The developped strategy was then applied to the synthesis of materials, such as smart partially degradable hydrogels or antibacterial polyesters. Last, the synthesis of amphiphilic star-shaped copolyester was investigated. [less ▲]

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See detailFacing the problem of the bis(acetylacetonato)cobalt(II)-mediated radical polymerization of acrylates
Hurtgen, Marie ULg; Debuigne, Antoine ULg; Jérôme, Christine ULg et al

Poster (2010, July 13)

Cobalt-Mediated Radical Polymerization (CMRP) is an efficient tool for polymerizing acrylates and vinyl esters. However, a challenge in CMRP remains in controlling the polymerization of both types of ... [more ▼]

Cobalt-Mediated Radical Polymerization (CMRP) is an efficient tool for polymerizing acrylates and vinyl esters. However, a challenge in CMRP remains in controlling the polymerization of both types of monomers with the same cobalt complex. Here, we show how Co(acac)2, efficient for unconjugated vinyl monomers, can also cope with acrylates. [less ▲]

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See detailStudy of oxylipins pathways by a transcriptomic analysis of two variety of
Ghars, Mohamed Ali ULg; Muhovski, Y.; Ghanem, M. et al

Poster (2010, July 11)

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See detailFunctionalization of carbon xerogels for the preparation of Pd/C catalysts by grafting of Pd complex
Diverchy, C.; Hermans, S.; Job, Nathalie ULg et al

Poster (2010, July 11)

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See detailImmobilization of homogenous catalysts in nanostructured carbon materials
Gheorghiu, C. C.; Pérez-Cadenas, M.; Roman-Martinez, M. C. et al

Poster (2010, July 11)

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See detailIs there a generalized procedural deficit in children with Specific Language Impairment?
Gabriel, Audrey ULg; Maillart, Christelle ULg; Guillaume, Mélody et al

Poster (2010, July 08)

Previous studies (Lum et al., 2009; Tomblin et al., 2007; Ullman & Pierpont, 2005) have suggested that difficulties in the procedural learning system could contribute, in part, to the language ... [more ▼]

Previous studies (Lum et al., 2009; Tomblin et al., 2007; Ullman & Pierpont, 2005) have suggested that difficulties in the procedural learning system could contribute, in part, to the language difficulties observed in children with SLI. However, we have recently shown, with an adapted serial reaction time (SRT) task, that children with SLI are able to learn implicitly non-linguistic regularities (Gabriel et al., submitted). In this research, we wanted to determine whether children with SLI are able to learn an 8-elements probabilistic sequence into which irregularities are inserted. Assessing probabilistic sequence learning in children with SLI should help us to better circumscribe the language difficulties of these children [less ▲]

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See detailTiO2 thin films (1 µm) with ordered porosity used as high performance photoelectrode in DSSC
Dewalque, Jennifer ULg; Cloots, Rudi ULg; Dubreuil, Olivier et al

Poster (2010, July 06)

Mesoporous anatase thin films are very promising materials to act as electrode in dye-sensitized solar cells. Randomly oriented nanocrystalline TiO2 particles are usually used to prepare photoelectrodes ... [more ▼]

Mesoporous anatase thin films are very promising materials to act as electrode in dye-sensitized solar cells. Randomly oriented nanocrystalline TiO2 particles are usually used to prepare photoelectrodes with a thickness of 10-15 µm. Templated-assisted dip-coating techniques are used to obtain thin films with ordered porosity. The use of different templates influences the film porosity in terms of long-range order, percentage of porosity, pore size and pores connectivity. The photovoltaic performances of the samples have been evaluated. Such mesostructured films are compared in terms of photovoltaic performance with TiO2 nanoparticles films, generally used in DSSC. [less ▲]

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See detailDiversité des pucerons en parcelles de pomme de terre et impact sur la dissémination des viroses
Yattara, Almouner Ag Alhamis ULg; Véronique Genin, Lionel Hartert; Francis, Frédéric ULg

Poster (2010, July 05)

Protect crops against aphids is even less easy than the high proliferation potential and possible infestation by winged individuals from distant homes, require on the part of farmers regularly monitored ... [more ▼]

Protect crops against aphids is even less easy than the high proliferation potential and possible infestation by winged individuals from distant homes, require on the part of farmers regularly monitored. In addition, in the case of aphid vectors of virus diseases, it is necessary to detect the first attacks to limit the spread of the disease within the plot. In 2009, the abundance and diversity of aphids was studied using the yellow bins installed in a network of nine plots of potatoes throughout Wallonia. The evaluation of the diversity and abundance of aphid species were evaluated weekly by collecting the insects captured. At the same time catch and observations on the plots, a sample of thirty leaves of potato is taken from each of the nine plots and analyzed in the laboratory to detect any viral infections, mainly PVY and PLRV. During the growing season, six species of aphid were particularly abundant: Metopolophium dirhodum, Sitobion avenae, Aphis fabae, Macrosiphum euphorbiae, Rhopalosiphum padi and Acyrthosiphon pisum. The ELISA performed on leaf samples taken from different plots of potato revealed the presence of PVY and PLRV in six of nine plots sampled. We observed a greater diversity of aphid species in almost all plots investigated. [less ▲]

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See detailRetrospective evaluation of 9 horses with surgical treatment of keratoma
Salciccia, Alexandra ULg; Bouhmala, Nabil; Serteyn, Didier ULg et al

Poster (2010, July 02)

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See detailClotridial hydrogenases and the biohydrogen production
Calusinska, Magdalena ULg; Hamilton, Christopher ULg; Masset, Julien ULg et al

Poster (2010, July 01)

Among the large variety of microorganisms capable of fermentative hydrogen production, strict anaerobes such as Clostridium spp. are one of the most widely studied. They produce hydrogen by butyric and ... [more ▼]

Among the large variety of microorganisms capable of fermentative hydrogen production, strict anaerobes such as Clostridium spp. are one of the most widely studied. They produce hydrogen by butyric and mixed-acid fermentations at optimal pH values ranging from 4.5 to 5.5. While fermentative conditions such as substrate type, pH, hydraulic and solid retention time, H2 partial pressure and the concentration of acids produced have been extensively studied and optimized, relatively little is known about the different forms of hydrogenases present in clostridia. Building on previous reports [1, 2] and by analyzing sequenced genomes, we found that [FeFe] hydrogenases are not a homogenous group of enzymes, but exist in multiple forms with different modular structures and are especially abundant in Clostridum spp. [3]. However, among the numerous studies performed on fermentative hydrogen production by Clostridium sp., only a few are specifically concerned with hydrogenases. Even there the authors focus on one type of [FeFe] hydrogenase, (CpI-like) without considering the existence of multiple forms of this enzyme within one species. Therefore, we focused our research on the better characterization of different forms of hydrogenases present in the genus Clostridium. Using newly designed degenerate primers, specific for clostridial hydrogenases, we amplified different hydrogenases from our species of interest. Further, by designing specific qPCR assays we have quantitatively targeted different hydrogenases. By analyzing differential gene expression, according to applied growth conditions, we believe to optimize the hydrogen production process in order to achieve better production rates. To conclude, we think that a a precise knowledge of hydrogen metabolism and hydrogenases is essential to optimization of the biohydrogen production process and should therefore be a goal for future research. [less ▲]

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See detailA role for PSA-NCAM-dependent neuron-glia interactions in the control of GnRH neuron activity
Franceschini, Isabelle; Desroziers, Elodie ULg; Lomet, Didier et al

Poster (2010, July)

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See detailDetection of differential item functioning with the difR package
Magis, David ULg; Béland, Sébastien; Tuerlinckx, Francis et al

Poster (2010, July)

The purpose of this talk is to briefly present the package difR of the software R. This package permits to identify differential item functioning (DIF) with several parametric or nonparametric methods ... [more ▼]

The purpose of this talk is to briefly present the package difR of the software R. This package permits to identify differential item functioning (DIF) with several parametric or nonparametric methods. Nonparametric methods include: Mantel-Haenszel, standardization, logistic regression and Breslow-Day. Available parametric methods are the Lord’s chi-square test, the Raju’s area method, and the likelihood-ratio test. Some methods for DIF identification in multiple groups (generalized Mantel-Haenszel, generalized Lord’s test) are also available. The presentation focuses on the package and its potential, rather than on the included methods. Its performance will be illustrated with an example data set. [less ▲]

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See detailMapping of kisspeptin projections in the midbrain of the pro-oestrus rat
Desroziers, Elodie ULg; Mikkelsen, Jens; Simmoneaux, Valérie et al

Poster (2010, July)

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See detailAn in-situ NMR analysis of the formation of P- and SiO2-doped TiO2 xerogels
Bodson, Céline ULg; Lambert, Stéphanie ULg; Cattoën, Xavier et al

Poster (2010, July)

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See detailKisspeptin immunoreactivity during post-natal development in rat.
Desroziers, Elodie ULg; Mikkelsen, Jens; Caraty, Alain et al

Poster (2010, July)

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See detailActivated-carbon-xerogel/TiO2-P25 composite photocatalysts with high activity for the degradation of p-nitrophenol
Páez Martínez, Carlos ULg; Contreras, María; Olivera-Fuentes, Claudio et al

Poster (2010, July)

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See detailMassive binaries as seen with GAIA
Palate, Matthieu ULg; Rauw, Grégor ULg; Gosset, Eric ULg et al

Poster (2010, July)

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See detailMultifractality in the kicked rotator
Martin, John ULg; Garcia-Mata, Ignacio; Giraud, Olivier et al

Poster (2010, July)

Detailed reference viewed: 37 (9 ULg)
See detailMultiqubit symmetric states with a high geometric entanglement
Martin, John ULg; Giraud, O.; Braun, P. A. et al

Poster (2010, July)

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See detailA phylogenomic falsification of the chromalveolate hypothesis
Baurain, Denis ULg; Brinkmann, Henner; Petersen, Jorn et al

Poster (2010, July)

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See detailMorphologie de la mineuse des fruits du safoutier
Poligui, René Noël ULg; Mouaragadja, Isaac; Francis, Frédéric ULg et al

Poster (2010, July)

L’étude de l’entomofaune des associations culturales prenant en compte le safoutier a permis de mettre en évidence des fortes abondances et une diversité des familles entomologiques. Au niveau des ... [more ▼]

L’étude de l’entomofaune des associations culturales prenant en compte le safoutier a permis de mettre en évidence des fortes abondances et une diversité des familles entomologiques. Au niveau des ravageurs majeurs, nous avons caractérisé un lépidoptère (tortricidae) dont les larves minent les noyaux des fruits du safoutier (Dacryodes edulis) et peuvent induire une chute prématurée d’au moins 25% de fruits. Toutes petites, les larves sont blanches et tachetées de points noirs, puis dans leur dernier stade, elles sont roses avec la tête, les plaque anale et prothoracique brunes. La chrysalide se forme dans un cocon de soie blanc. Elle est brune au départ et noir en fin de nymphose, et se caractérise par un crémaster noir proéminent au milieu de deux paires de soie recourbées à leurs extrémités. La nymphose dure au moins 20 jours. L’adulte est un paillon gris terne. Outre le safoutier, ce lépidoptère a été trouvé dans les fruits de Pseudopdondias longifolia. Des investigations ultérieures révéleront certainement d’autres plantes hôtes et permettront d’envisager une lutte biologique efficiente contre cette mineuse des fruits. [less ▲]

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See detailThe essential role of the plastidial glyceraldehyde- 3-phosphate dehydrogenase in viable pollen development in Arabidopsis
Muñoz-Bertomeu, Jesús; Cascales - Miñana, Borja ULg; Anoman, Armand D. et al

Poster (2010, July)

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See detailKraft recovery boiler analysis : a data mining approach
Sainlez, Matthieu ULg

Poster (2010, July)

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See detailRegulation of GnRH-1 neurons by glial cells: an in vitro study
Desroziers, Elodie ULg; Kolasa, Elise; Franceschini, Isabelle et al

Poster (2010, July)

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See detailA MODEL FOR WHEAT YIELD PREDICTION BASED ON REAL-TIME MONITORING OF ENVIRONMENTAL FACTORS
Dumont, Benjamin ULg; Lebeau, Frédéric ULg; Vancutsem, Françoise ULg et al

Poster (2010, July)

This paper presents the results of a one year preliminary study in which a real time monitoring system was used to feed the STICS soil crop model. As indicated by the statistical criteria (RMSE and model ... [more ▼]

This paper presents the results of a one year preliminary study in which a real time monitoring system was used to feed the STICS soil crop model. As indicated by the statistical criteria (RMSE and model efficiency), the optimization of some wheat crop parameters allows the model to predict the yields with good accuracy for different soil type and different nitrogen application rates. [less ▲]

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See detailEntomofaune du safoutier (Dacryodes edulis (G. Don) H.J. Lam ; Burseraceae) au Gabon : résultat dune première année d’investigation
Poligui, René Noël ULg; Mouaragadja, Isaac; Haubruge, Eric ULg et al

Poster (2010, July)

L’entomofaune du safoutier (Dacryodes edulis (G. Don) H.J. Lam ; Burseraceae) a été étudié au moyen des pièges jaunes et des observations visuelles, pendant seize semaines au Gabon, dans la province du ... [more ▼]

L’entomofaune du safoutier (Dacryodes edulis (G. Don) H.J. Lam ; Burseraceae) a été étudié au moyen des pièges jaunes et des observations visuelles, pendant seize semaines au Gabon, dans la province du Haut-Ogooué. Cinq postes de piégeages ont été installés à Franceville et cinq autres en périphérie de la ville. Les deux méthodes situent l’évolution des insectes en deux vagues dont la première et la plus importante s’étend sur huit semaines, correspond à la période de floraison de l’arbre et de pleine croissance des fruits. La seconde vague va de l’arrêt de croissance des fruits à leur maturation. Le piégeage révèle que les abondances des insectes ainsi que leur diversité biologique par poste sont plus importantes en milieu rural qu’en milieu urbain. Le contrôle visuel présente des abondances relativement similaires, mais avec une diversité sensiblement plus élevée en milieu rural. Les sites à prédominance de savanes permettent des captures d’insectes plus importantes que ceux des forets. L’abondance est globalement moins élevée au niveau des arbres males pour les deux techniques d’étude. Par contre, les observations visuelles enregistrent les pics les plus élevés sur les arbres femelles, mais le piégeage les situe sur les arbres males. La diversité biologique est significativement mieux exprimée par le piégeage, alors que le contrôle visuel spécifie mieux le niveau et l’évolution des ravageurs. Les Aphididae, les Cicadellidae et les psyllidae constituent les familles numériquement les plus importantes des insectes nuisibles. Les Apidae, les coccinellidae et les halticidae forment les familles majeures des insectes utiles. Les Tortricidae constituent la famille ayant la plus grande incidence économique sur le safoutier. [less ▲]

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See detailComputerized video multitracking of several small translucent fishes (glass eels) at night with fluorescent elastomer tags
Delcourt, Johann ULg; Bolliet, Valérie; Ylieff, Marc ULg et al

Poster (2010, July)

European eels (Anguilla Anguilla), an endangered species with high economic value, exhibit very unusual features in their multistage catadromous life cycle at different life stages. The reproduction of ... [more ▼]

European eels (Anguilla Anguilla), an endangered species with high economic value, exhibit very unusual features in their multistage catadromous life cycle at different life stages. The reproduction of eel takes place in the Sargasso Sea. Leptocephalus larvae use ocean currents (mainly the Gulf Stream) to migrate to European coastal areas, and then metamorphose into glass eels probably as they reach the continental shelf. Glass eel then, enter estuaries to join the fresh waters network. Knowledge about glass eel biology and migration has mainly increased in the eighties, and it is now well established that the activity during the estuary migration depends mainly on tidal cycle, even if lunar and circadian rhythms and/or direct influence of light and tidal coefficient may interact. Different migratory tactics are suspected on the basis of recent laboratory experiments (Bolliet & Labonne, 2008; Bureau du Colombier et al., 2009), notably the existence of individuals swimming only with the current, others swimming with and against the current, and others presenting a weak degree of activity. The propensity to migrate and glass eels energy content would be linked and may result in different migratory behaviours possibly leading to estuarine settlement (Bureau du Colombier et al., 2007; 2009). Unfortunately, few are known about the glass eel swimming behaviours in estuaries, a crucial point to better understand their estuarine migration: such knowledge would help to characterize the migratory tactics and to better understand the link with energy status. The videotracking system [EthoVision Color-Pro 3.1 (Noldus Information Technology)] which allows to measure automatically the movements of individuals represents an interesting tool to progress in this questioning. Nowadays, video tracking to measure fish behaviours is relatively frequent, but is rather rare in the ecological studies. Moreover, tracking a transparent animal, under water current conditions is a real challenge, particularly at night. To detect the individuals, several eels are marked by a fluorescent VIE tag (Visible Implant Elastomer, Northwest Marine Technology Inc.). VIE do no affect growth, survival and behaviour of tagged glass eels. Initially developed to improve the identification of individual tags in mark-recapture studies of aquatic animals, VIE tags are used here for a new extreme application in ethometry: the study of behaviours of transparent animals in weaker luminosity and in the dark by automatic tracking technology. The individual identification is based on the fluorescent color (red, blue, yellow and green) emitted by the VIE tag injected in the muscle mass on the basis of dorsal fin. The detection of the four marks is excellent. It allows measuring the activity (notably path and speed) of each tagged individuals as a function of tidal and nycthemeral rhythms in the same chronotron (circular aquarium simulating the estuarine conditions) and spatial use at a wide time scale from second to week. Another advantage is the possibility of tracked animals to go out the analysed arena without error of identification when it appears again in the analysed zone. This multitracking method by fluorescent VIE tags could be applied to a large number of species (crustaceans, fish, holothurians, amphibians, …). References: Bolliet & Labonne, 2008 Journal of Experimental Marine Biology and Ecology 362, 125-130; Bureau du Colombier et al., 2007 Physiology & Behavior 92, 684-690 ; Bureau du Colombier et al., 2009 Journal of Fish Biology 74, 2002-2013. Acknowledgements: This work was financially supported by FNRS-FRS (National fund of Research, Belgium) (project n°2.4617.08, n°2.4569.06, n°2.4569.10F), by Hubert Curien Tournesol project and by an EGIDE Grant. We thank J-C. Aymes for its help in testing the video tracking software and system. We are also highly grateful to Jacques Rives for its help in settling and monitoring the experiments. [less ▲]

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See detailAssociation des approches morphologique et moléculaire pour l’identification des vers à soies endémiques de Madagascar (Lasiocampidae, Borocera cajani)
Rakotondramanana, Alihasina; Nguyen, Bach Kim ULg; Verheggen, François ULg et al

Poster (2010, July)

La soie est une matière utilisée par les Malgaches depuis bien avant la colonisation. Cette soie est fabriquée à partir de la collecte de cocons des papillons du genre Borocera spp., ver à soie sauvage ... [more ▼]

La soie est une matière utilisée par les Malgaches depuis bien avant la colonisation. Cette soie est fabriquée à partir de la collecte de cocons des papillons du genre Borocera spp., ver à soie sauvage. On connaît une dizaine d’espèces de vers à soie sauvages endémiques à Madagascar. Ces lépidoptères polyphages se nourrissent surtout des feuilles de Uapaca bojeri et d’autres plantes telles que Dodonea madagascariensis et Psidium guyava. Les critères morphologiques se révèlent insuffisant pour identifier cette diversité d’espèces de vers à soie, surtout au niveau des stades immatures. Afin de pallier à cette incapacité d’identifier les espèces, des méthodes de marqueurs moléculaires, en particulier la RAPD (Random Amplified Polymorphic DNA) et iSSR (inter Simple Sequence Repeat), ont été appliquées. En plus de l’identification des espèces, une étude de la diversité et de la distribution des vers à soie suite à la collecte dans plusieurs forêts éloignées de plusieurs de kilomètres les unes des autres (Arivonimamo, Ambatofinandrahana, Antananarivo). Cette étude a été menée dans le cadre de la conservation de ces espèces de vers à soie endémiques en milieu. Afin d’augmenter durablement les populations de vers à soie endémiques dans les forêts de Uapaca, il est important de déterminer les espèces en présence et les capacités de dispersion de ces dernières. Les techniques d’identification moléculaires développées permettront d’orienter les stratégies de gestion des populations de Borocera et des méthodes de gestion de l’écosystème, appropriables par les gestionnaires et les communautés locales des la forêt à Uapaca bojeri. [less ▲]

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