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See detailOperational monitoring of multi-qubit entanglement classes with trapped ions
Bastin, Thierry ULg; Thiel, C.; von Zanthier, J. et al

Poster (2008)

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See detailMechanisms of ATM regulation by TGF-beta
Paupert, Jenny ULg; Barcellos-Hoff, Mary-Helen

Poster (2008)

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See detailSwitching entanglement classes via local operations
Bastin, Thierry ULg; Thiel, C.; von Zanthier, J. et al

Poster (2008)

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See detailProgress towards new atomic species laser cooling
Krins, Stéphanie ULg; Saint-Georges, P.; Bastin, Thierry ULg

Poster (2008)

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See detailSecreted subtilisins of Microsporum canis are involved in adhesion of arthroconidia to feline corneocytes
Mathy, Anne ULg; Tabart, Jérémy; Mignon, Bernard ULg et al

Poster (2008)

Microsporum canis is a pathogenic fungus that causes a superficial skin infection called dermatophytosis mainly in cats, dogs and humans. Like other dermatophytoses, the physiopathology of this dermatosis ... [more ▼]

Microsporum canis is a pathogenic fungus that causes a superficial skin infection called dermatophytosis mainly in cats, dogs and humans. Like other dermatophytoses, the physiopathology of this dermatosis remains largely unknown. From a fungal perspective, the infection process can be divided in three steps: adhesion of M. canis arthroconidia to corneocytes, conidial germination, and fungal invasion of the keratin network. The mechanisms involved in adherence of M. canis to epidermis have never been investigated. However, several previously characterized secreted fungal endoproteases like subtilisins (Sub), including the keratinolytic protease Sub3, are secreted in vivo and could be involved in the first pathogenic steps. The objective of this study were (1) to develop an in vitro model to study M. canis adherence to feline corneocytes and (2) to assess whether the Sub are involved in fungal adhesion. An arthroconidial suspension was spread over the surface of reconstituted feline epidermis (RFE). Co-cultures were incubated for varying lengths of time and adherent conidia were labelled using Calcofluor white and counted. In subsequent assays arthroconidia were exposed to the serine protease inhibitor chymostatin or a mixture of two anti-Sub3 monoclonal antibodies (Mabs) one hour prior to the adherence assay. In our model, adherence of M. canis arthroconidia to RFE is time-dependent, beginning within two hours and still increasing after six hours. Chymostatin and Mabs inhibit M. canis adherence to RFE by 53 and 23 % respectively, which suggests that subtilisins and particularly Sub3, are fungal virulence factors involved in the adherence process. [less ▲]

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See detailTowards an iron magneto-optical trap
Krins, Stéphanie ULg; Saint-Georges, P.; Bastin, Thierry ULg

Poster (2008)

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See detailFra-1 and its associated transcriptome are central determinants of human breast cancer metastasis
Desmet, Christophe ULg; Prieur, A; Reyal, F et al

Poster (2008)

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See detailGeneration of symmetric Dicke states
Thiel, C.; von Zanthier, J.; Bastin, Thierry ULg et al

Poster (2008)

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See detailLaser cooling of new atomic species - scheme of operation
Saint-Georges, P.; Krins, Stéphanie ULg; Bastin, Thierry ULg

Poster (2008)

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See detailHETEROGENEITY OF ZOOXANTHELLAE DENSITY IN THE CORAL ACROPORA GLOBICEPS AROUND MOOREA (FRENCH POLYNESIA)
Ladrière, Ophélie ULg; van Lierde, Elodie; Penin, Lucie et al

Poster (2008)

Understanding the natural heterogeneity of coral zooxanthellae density appears as very important to understand variations in coral survival due to bleaching (the loss of these micro-algal symbionts ... [more ▼]

Understanding the natural heterogeneity of coral zooxanthellae density appears as very important to understand variations in coral survival due to bleaching (the loss of these micro-algal symbionts). Heterogeneity of coral bleaching at different observation scales (within a colony, among neighbouring colonies of the same species or on a wider scale) remains largely misunderstood. The present work explores intracolonial, spatial and temporal variations of zooxanthellae density in the coral Acropora globiceps Dana 1846, over a period of three months on the forereef of Moorea, French Polynesia. In our study, intracolonial zooxanthellae densities did not vary significantly. However, zooxanthellae densities differed slightly between inner and outer branches but this trend was not significant at 6, 12 and 18 meters depth. On a wider scale, zooxanthellae densities also vary spatially : a positive correlation was observed between depth and symbiont density (density increases when light intensity decreases, so according to depth). Moreover, the location of colonies exposed to different hydrodynamical conditions was not a parameter controling the concentration of zooxanthellae. Finally, the temporal variation of zooxanthellae densities did not show significant variations even if it decreased slightly over the study period. The results of this study highlight the importance of accounting for variations within and among colonies to determine zooxanthellae densities and to assess the evolution of zooxanthellae populations. [less ▲]

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See detailInteraction-free Generation of Angular Momentum Eigenstates in Remote Qubits
Thiel, C.; Maser, A.; Bastin, Thierry ULg et al

Poster (2008)

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See detailProtein synthesis and folding is a rate limiting step for bacterial growth at low temperatures.
Piette, Florence; D'Amico, Salvino; Leprince, Pierre ULg et al

Poster (2008)

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See detailHistology and ultrastructure of the elastic spring apparatus in Synodontis eupterus
Fabri, Grégory; Montchowui, E; Vandewalle, Pierre ULg et al

Poster (2008)

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See detailProtein synthesis and folding is a rate limiting step for bacterial growth at low temperatures.
Piette, Florence; D'Amico, Salvino; Leprince, Pierre ULg et al

Poster (2008)

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See detailMechanisms of ATM regulation by TGF-beta
Paupert, Jenny ULg; Barcellos-Hoff, Mary-Helen

Poster (2008)

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See detailPhosphorylation of huntingtin by cyclin dependent kinase 5.
Godin, Juliette ULg; Anne, Sandrine; Humbert, Sandrine

Poster (2008)

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See detailThe effects of cognitive remediation therapy on AM deficits in schizophrenia patients
Boulanger, Marie ULg; Collet, Denis; Cornet, Lidvine et al

Poster (2008)

Schizophrenia is accompanied by deficit in autobiographical memories (AM). These impairments are correlated to difficulties in imagining specific events that might happen to them in the future ... [more ▼]

Schizophrenia is accompanied by deficit in autobiographical memories (AM). These impairments are correlated to difficulties in imagining specific events that might happen to them in the future (D’Argembeau, Raffard et Van-der-Linden, 2008). Previous study suggested that the specific autobiographical memory (past and future) may be improved by an AM remediation therapy (Blairy et al., accepted). The aim of the present study was to compare performances from individuals involved in an AM remediation intervention to individuals involved in the cognitive remediation therapy program from Brenner (IPT) (Pomini, Neis, Brenner, Hodel et Roder, 1998). The results showed that the participants tend to recall more specific events after therapies, confounded pass and future events (t(7) = 3.28 ; p = .013). These results would be promising for future research. [less ▲]

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See detailDevelopment of Procedural Learning in Children : The “Toy Task”
Lejeune, Caroline ULg; Meulemans, Thierry ULg

Poster (2008)

The authors generally agree that procedural learning abilities play an important role in the child development and that they are present early in childhood. However, few studies have been carried out in ... [more ▼]

The authors generally agree that procedural learning abilities play an important role in the child development and that they are present early in childhood. However, few studies have been carried out in this area because of the difficulty to develop tests specifically designed for the evaluation of these capacities in young children. In this study, we presented a new task aimed to evaluate visuo-motor skill learning in the young child. The purpose of the present study was to explore whether procedural learning abilities are present in the same extent in 4-year as 7- and 10-year-old children. Our sample is composed of 60 children divided into 3 age-groups. The task is composed of 5 blocks of 12 trials during which each subject has to use a reversed mouse of a computer in order to “catch” different toys appearing on the screen; 2 blocks of 12 trials was administered after a 15 minutes delay. Our results show an important difference between the groups for the first block; on the other hand, for the next blocks, the results show an absence of age-related difference between participants in our perceptive-motor skill learning task, confirming the idea according to which procedural learning abilities are efficient early in development (the difference observed during the first block being probably due to the intervention of executive mechanisms). [less ▲]

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See detailBioethanol subproducts as a basis of plant biorefinery
Destain, Jacqueline ULg; Laurent, Pascal ULg; Ndoye, Bassirou et al

Poster (2008)

The philosophy of our research is built on the behaviour of non-sugar compounds from biomass during ethanolic fermentation. Saccharomyces cerevisiae, industrially used to bioconvert sugar into ethanol ... [more ▼]

The philosophy of our research is built on the behaviour of non-sugar compounds from biomass during ethanolic fermentation. Saccharomyces cerevisiae, industrially used to bioconvert sugar into ethanol under anaerobic conditions, assimilates some compounds present in the fermentable juice (proteins, amino acids,...). But others compounds are not used by the yeast. They leave in the vinasse after ethanol distillation and are thus concentrated by the process. Our purpose is to discuss the behaviour of betaine, saponins and raffinose in sugar juices (raw juice, thin juice, thick juice) and in vinasse after ethanolic fermentation. An attention will be given to some high added value products (like betaine) and the potentialities to use fermentation as a tool of purification in white chemistry. [less ▲]

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See detailNew insights in auditory organ development: the inner pillar cell goes it own way
Thelen, Nicolas; Malgrange, B; Thiry, Marc ULg

Poster (2008)

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See detailMorphological echocardiographic measurements: reference values as a function of body size in equids
Al Haidar, A; Sandersen, Charlotte ULg; Van Erck, Emmanuelle et al

Poster (2008)

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See detailThe TNF receptor signalling network: Modular modelling and cell-type specific analysis
Waldherr, S; Doszczak, M; Schliemann, Monica ULg et al

Poster (2008)

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See detailDINEOF univariate reconstruction of missing satellite data from the North Sea Belcolour-1 database.
Sirjacobs, Damien ULg; Alvera Azcarate, Aïda ULg; Barth, Alexander ULg et al

Poster (2008)

The Belcolour-1 database holds more than 4 years of uniformly resampled MERIS chlorophyll (CHL), total suspended matter (TSM), MODIS-AQUA CHL, TSM and sea surface temperature (SST) over the North Sea. A ... [more ▼]

The Belcolour-1 database holds more than 4 years of uniformly resampled MERIS chlorophyll (CHL), total suspended matter (TSM), MODIS-AQUA CHL, TSM and sea surface temperature (SST) over the North Sea. A first step of the RECOLOUR* project consists in the univariate reconstruction of missing data with the DINEOF method (Data Interpolating Empirical Orthogonal Functions). In particular, the DINEOF treatment of MERIS CHL and TSM images available for the year 2003 allowed an efficient synthesis of the coherent modes of variability existing at the scale of the whole North Sea. For both parameters, 4 modes were retained by general cross validation as an optimum for the reconstruction of missing data. For CHL, the first spatial mode shows the high influence of coastal nutrients outputs (mainly continental estuaries and diffused coastal sources) and the lower concentration in the well stratified central and northern part of the North Sea compared to the southern bight and the eastern English Channel. The spatial trends described by the first mode are permanent features during the year, although slightly enhanced during the summer and reduced during winter. The second spatial mode correspond to the main algal blooming events (spring and autumn) with increased concentrations in the whole southern bight of the north sea, around the Isle of Wight and in frontal alike structure north-west from Denmark. The third Eofs describes well the dynamics of an early phytoplankton bloom occurring in march along the Norwegian coast, where a strong stratification induced by an output of cold water from Baltic Sea provides good light conditions to phytoplankton. Concerning TSM, the first spatial mode shows the dominant influence of large estuaries and of resuspension from shallow coastal sedimental plains. The patterns suggest a general transport of sediments from south-east England up to the northern Dutch coastal waters, as a clear distinction between the stratified northern part and the well mixed and charged southern and German bights. Although these trends are permanent during the year, the range of the spatial variations are slightly reduced during the summer, following the reduction of resuspension, of total sediment outputed by rivers and of advection along continental coasts. The second mode shows a clear seasonal signal. The winter influence of the second spatial mode can be understood as general sediment enrichment due to higher resuspension, but a clear influence of intense winter terrestrial water outflows leading to lower sediment concentration in the plumes then in the surrounding waters. This is clear for the Elbe river discharge, the whole natural part of the Wadden Sea and the Seine river plume. The Scheelde and Thames rather seems to be just neutralizing the seasonal TSM resuspension signal. The Rhine river discharge seems to make exception as no influence is detected in the second spatial mode. During summer, the contribution of the second EOF is reversed with a general reduction of suspended matter concentration in most part of the area but some local sediment enrichment at specific river discharges. Original MERIS CHL and TSM images were filled and reconstructions were produced at a daily interval based on a linear interpolation of the temporal modes. From this, weekly averages could be calculated at stations such as the turbidity maximum of the Scheelde river plume, showing the onset of the spring bloom co-occurring with a period characterised both by the TSM seasonal reduction and by important TSM temporal variability. [less ▲]

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See detailUse of supercritical fluids technology (PGSS) for the production of betametazone loaded solid lipid microparticles
Nizet, Dominique; Jaspart, Séverine ULg; Brion, Michael et al

Poster (2008)

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See detailMechanism of sound production in Oreochromis niloticus
longrie, Nicolas; van Wassemberg, Sam; Mauguit, Quentin et al

Poster (2008)

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See detailSkill Learning and Repetition Priming in Alzheimer’s Disease
Merbah, Sarah ULg; Meulemans, Thierry ULg

Poster (2008)

Several studies have shown with the mirror reading paradigm that procedural learning and repetition priming might be preserved in the early stages of Alzheimer’s disease (Deweer et al., 1994). Repetition ... [more ▼]

Several studies have shown with the mirror reading paradigm that procedural learning and repetition priming might be preserved in the early stages of Alzheimer’s disease (Deweer et al., 1994). Repetition priming is demonstrated by the reading times improvement for repeated words, while procedural learning is demonstrated when this improvement is also observed for new words. Our hypothesis was that this improvement could be due to a repetition priming effect for the letters rather than to the learning of a mirror reading skill. Indeed, because the same letters are presented throughout the task, a repetition priming effect could be sufficient to explain the improvement of performance. In order to test this hypothesis, we have administered to 20 young and elderly subjects and to 20 Alzheimer’s patients a new mirror reading task including two phases: an acquisition phase comprising pseudo-words constructed with one part of the alphabet, and a test phase in which both pseudo-words constructed with the same part of the alphabet and pseudo-words constructed with another part of the alphabet were presented. Reading faster the new pseudo-words composed with the repeated letters would reflect a repetition priming effect, while reading faster pseudo-words composed with “new” letters would reflect a procedural learning effect. Results show comparable repetition priming effects in Alzheimer’s patients and in young and elderly subjects, whereas only young and elderly subjects showed a procedural learning effect. These results suggest, contrary to previous studies, that the learning of a new perceptual skill could be not preserved in Alzheimer’s disease. [less ▲]

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See detailRole of thiamine triphosphate and adenosine thiamine triphosphate in Escherichia coli
Gigliobianco, Tiziana ULg

Poster (2008)

Thiamine triphosphate (ThTP) is found in all organisms studied from bacteria to mammals. In E. coli, ThTP is accumulated as a result of amino acid starvation in the presence of a suitable carbon source ... [more ▼]

Thiamine triphosphate (ThTP) is found in all organisms studied from bacteria to mammals. In E. coli, ThTP is accumulated as a result of amino acid starvation in the presence of a suitable carbon source such as glucose, pyruvate and lactate. On the other hand, adenosine thiamine triphosphate (AThTP), that was recently discovered in E. coli, accumulates in the absence of a carbon source. While AThTP is synthesized in E. coli according to the reaction ThDP + ADP (ATP) ↔ AThTP + Pi (PPi) by a soluble high molecular mass nucleotidyl transferase, the mechanism of synthesis of ThTP remains unknown. Though both bacterial and mammalian adenylate kinases are able to catalyze ThTP synthesis at a very low rate in vitro, this reaction is not responsible for ThTP synthesis in vivo. AThTP is synthesized in E. coli incubated in minimal medium devoid of any carbon source. The addition of glucose leads to the immediate disappearance of AThTP and the appearance of ThTP. ThTP production is strongly impaired in the presence of protonophores, even when a high intracellular concentration of ATP is maintained through glycolysis. Our results suggest that ThTP accumulation requires a high protonmotive force rather than a high intracellular ATP concentration. On the other hand, AThTP is synthesized under conditions of limited energy availability, either in the absence of a carbon source or in the presence of a carbon source and metabolic inhibitors or uncouplers. Interestingly, ThTP and AThTP never accumulate simultaneously in high amounts. Our results suggest that in E. coli both compounds might therefore act as specific “alarmones”, responding to different conditions of cellular stress. [less ▲]

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See detailPhospholipids quantification in vegetable oil degumming residues by HPLC-ELSD
Pierart, Céline ULg; Danthine, Sabine ULg; Wathelet, B et al

Poster (2008)

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See detailAphid – ant mutualism : How do aphids focus ant foraging ?
Verheggen, François ULg; Diez, Lise; Detrain, Claire et al

Poster (2008)

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See detailProduction of alarm pheromone by developing aphids varies in response to their social environment
Verheggen, François ULg; Haubruge, Eric ULg; Demoraes, Consuelo et al

Poster (2008)

Aphid alarm pheromone—the volatile sesquiterpene (E)-β-farnesene (Eβf) in most species—is released in response to predation and other stresses and typically causes nearby aphids who receive the signal to ... [more ▼]

Aphid alarm pheromone—the volatile sesquiterpene (E)-β-farnesene (Eβf) in most species—is released in response to predation and other stresses and typically causes nearby aphids who receive the signal to cease feeding, drop from their host plant, and disperse. Because aphid alarm pheromone confers apparent fitness benefits on recipients while its production and release likely entail costs for the emitting aphid, it could be adaptive for aphids to regulate their Eβf production in response to variation in the social environment. To explore this possibility we compared the production of Eβf by Acyrthosiphon pisum (Harris) individuals reared from first-instar larvae to the adult stage in isolation to that of individuals reared among conspecifics or among individuals of a different aphid species, Myzus persicae (Sulzer). Levels of EβF produced in each treatment were assayed by GC-FID quantification of EβF in volatiles collected from crushed aphids. Production of EβF by A. pisum reared in isolation (14.4ng/aphid) was significantly lower than that of aphids reared in a colony of conspecifics (49.1ng/aphid), reared in a M. persicae colony (31.5ng/aphid) or reared among conspecifics of another aaphid clone (52.7ng/aphid). Though A. pisum individuals in our experiments produced less EβF when reared among M. persicae than among conspecifics, this difference was not statistically significant. In a separate experiment we reared A. pisum individuals in isolation and exposed them to the odor of conspecifics. Under these conditions, EβF production was similar to that of aphids reared among conspecifics, suggesting that aphids use volatile cues to assess their social environment and regulate their production of alarm pheromone accordingly. [less ▲]

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See detailA new method for absolute quantification of allergens in food: the "Heavy Peptides method".
Fourdrilis, Séverine; Bourgeon, Cédric; Kirsch, Stéphanie ULg et al

Poster (2008)

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See detailAnti-inflammatory properties of stigmasterol in cartilage: new insights
Gabay, Odile; Sanchez, Christelle ULg; Chevy, F. et al

Poster (2008)

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See detailEffect of temperature increase on the courtship behavior and the fitness in the Palmate newt
Galloy, Valérie ULg; Lo Presti, Wendy; Denoël, Mathieu ULg

Poster (2008)

A trend in global warming is now undeniable. Increases of global temperatures have resulted in measurable shifts in the distribution, phenology and survival of some plant and animal species. However, the ... [more ▼]

A trend in global warming is now undeniable. Increases of global temperatures have resulted in measurable shifts in the distribution, phenology and survival of some plant and animal species. However, the mechanisms showing the link between global warming and declines remain unclear. The aim of this study was to examine whether courtship displays and fitness could be affected by a temperature increase. To this end, we compared the sexual behavior and egg-laying traits at naturally occurring temperatures (14 C, 18 C and 22 C) in palmate newts (Triturus helveticus). First, our results underline the importance of female role in the male courtships. The majority of male behaviors are affected by the female responsiveness, which is temperature dependent. They also show that water temperature increase has a negative effect on the fecundity of female newts. Females lay half as many eggs at high temperatures as they do at low temperatures and of these only one third hatch. The demonstration of such a detrimental effect shows that more experimental studies are required to understand the proximate mechanisms of global warming. [less ▲]

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See detailImplementation of health aspects (ER N°3) in the Construction Products; Directive (CPD) regarding emissions to indoor air
Lor, Marc; Vause, Kevin; Goelen, Eddy et al

Poster (2008)

Standardisation work on test methods for dangerous substances released in the indoor air by construction products is currently ongoing at European level. The paper presents a study conducted in Belgium ... [more ▼]

Standardisation work on test methods for dangerous substances released in the indoor air by construction products is currently ongoing at European level. The paper presents a study conducted in Belgium, which compares methods in three different test chambers and aiming at assessing the performance of the products placed on the market. [less ▲]

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See detailLeaves of Bigaradier (Citrus aurantium) dried by micro-onde for the storage
Dahak, K.; Wathelet, Jean-Paul ULg; Chechounai, H. et al

Poster (2008)

In this paper, our goal is to develop methods to choose the good drying and storage processes for medicinal and aromatic plants. We project the study of the kinetics of drying of the leaves of Bigaradier ... [more ▼]

In this paper, our goal is to develop methods to choose the good drying and storage processes for medicinal and aromatic plants. We project the study of the kinetics of drying of the leaves of Bigaradier. This Mediterranean plant is known by its therapeutic properties. [less ▲]

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See detailThe cold-adapted trigger factor from the Antarctic bacterium Pseudoalteromonas haloplanktis.
D'Amico, Salvino; Piette, Florence; Leprince, Pierre ULg et al

Poster (2008)

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See detailComparison of T1 and T2 - weighted and Blade MRI sequences for examination of canine normal abdomen
Hoffmann; Buttin; Haye et al

Poster (2008)

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See detailSynthèse de nouveaux surfactants dérivés des acides D-glucuronique et D-galacturonique.
Laurent, Pascal ULg; Richel, Aurore ULg; Richard, Gaetan ULg et al

Poster (2008)

A l'heure actuelle, le bioraffinage se présente de plus en plus comme une alternative prometteuse aux filières pétrochimiques puisqu'il vise à la fois le remplacement d'une partie du pétrole comme source ... [more ▼]

A l'heure actuelle, le bioraffinage se présente de plus en plus comme une alternative prometteuse aux filières pétrochimiques puisqu'il vise à la fois le remplacement d'une partie du pétrole comme source d'énergie et le développement de produits chimiques issus de la biomasse (végétale principalement) tels que détergents, produits phytopharmaceutiques, dissolvants, matières plastiques, etc. La valorisation de carbohydrates provenant de matières premières renouvelables [1] fait ainsi actuellement l'objet de nombreuses recherches. Dans ce cadre, la synthèse de nouveaux tensioactifs non ioniques dérivés des acides Dglucuronique et D-galacturonique a été effectuée de manière chimique et/ou enzymatique. [less ▲]

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See detailThe influence of affective valence on false recall in the DRM procedure.
Dehon, Hedwige ULg; Laroi, Frank ULg; Van der Linden, Martial

Poster (2008)

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See detailAnalyse des lipides polaires de la MFGM par SPE et HPLC-ELSD
Bodson, P.; Danthine, Sabine ULg; Blecker, Christophe ULg et al

Poster (2008)

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See detailFast mapping between grammatical constructions and meaning Two experiments in French children aged 3 to 4
Maillart, Christelle ULg; Parisse, Christophe; Dupont, Fanny et al

Poster (2008)

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See detailThe influence of affective valence on false recognition in the DRM procedure.
Dehon, Hedwige ULg; Laroi, Frank ULg; Van der Linden, Martial

Poster (2008)

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See detailEvaluation du potentiel antioxydant et de la propriété antiproliférative de l’huile essentielle d’armoise blanche du Maroc oriental
Imelouane, B.; Amjamdi, H.; Dubois, J. et al

Poster (2008)

La présente communication est consacrée à l’étude du pouvoir antioxydant de l’huile essentielle de l’armoise blanche. Les résultats obtenus montrent qu’effectivement l’huile essentielle de l’armoise et ... [more ▼]

La présente communication est consacrée à l’étude du pouvoir antioxydant de l’huile essentielle de l’armoise blanche. Les résultats obtenus montrent qu’effectivement l’huile essentielle de l’armoise et riche en antioxydant et inhibe le développement de quelques lignées cellulaires. [less ▲]

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See detailDEVELOPMENT OF AN INTRAPERITONEAL IMPLANT FOR THE ENDOMETRIOSIS TREATMENT
Krier, Fabrice ULg; Nizet, Dominique; Riva, Raphaël ULg et al

Poster (2008)

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See detailFinite element modelling of thermo-elasto-plastic water saturated porous materials
Luison, Loris; François, Bertrand ULg; Bortolotto, Roberto et al

Poster (2008)

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See detailAffective valence influences participant’s susceptibility to false memories and illusory recollection
Dehon, Hedwige ULg; Laroi; Van der Linden, Martial

Poster (2008)

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See detailNew pyridinic analogues of nimesulide as potent COXs inhibitors.
Renard, Jean-François ULg; Garbacki, Nancy ULg; de Leval, Xavier et al

Poster (2008)

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See detailClinal differentiation during invasion: Senecio inaequidens (Asteraceae) along altitudinal gradients in Europe.
Monty, Arnaud ULg; Mahy, Grégory ULg

Poster (2008)

Plant population differentiation may play a role in decreasing the ability to predict whether, where, and when an introduced species will invade. However, few studies have addressed the level of genetic ... [more ▼]

Plant population differentiation may play a role in decreasing the ability to predict whether, where, and when an introduced species will invade. However, few studies have addressed the level of genetic change an alien species may undergo during range expansion, e.g. in response to climatic variation with altitude. In the present study, we tested the hypothesis that invasive populations of Senecio inaequidens (Asteraceae) differentiated during migration from two independent introduction sites into divergent altitudinal and climatic zones. We carried out two years of common garden experiments with eight populations from a Belgian altitudinal transect and ten populations from similar French transect. Climatic analysis revealed that the Belgian transect followed a temperature and precipitation gradient. A temperature and summer drought gradient characterized the French study site. We evaluated differentiation and clinal variation in the following characters: days to germination, days to flowering, height at maturity, final plant height and aboveground biomass. Results showed that S. inaequidens populations differentiated in growth traits during invasion. First year of experiment, regressing population growth trait means against source population altitude indicated the presence of clinal variation along both transects. Second year, similar results were found along the French transect, i.e. a reduction in height at maturity, plant height and aboveground biomass with increasing altitude. Including seed mass as a covariate did not change the outcome of the analysis. The possible evolutionary causes for the differentiation observed are discussed. [less ▲]

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See detailAdvection mechanism and their impact on CO2 net ecosystem exchange at three Carboeurope forest sites
Feigenwinter, Christian; ADVEX team; Heinesch, Bernard ULg et al

Poster (2008)

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See detailFunctional properties of phospholipids and proteins from rapeseed as native tensioactives
Vaca Medina, Guadalupe; Mouloungui, Zéphirin; Deleu, Magali ULg et al

Poster (2008)

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See detailHarbour porpoises stranded on the Dutch coast in 2007: Impact of by cath and related lesions
Grondin, Alexia; Camphuysen, K.; Ghisbain, T. et al

Poster (2008)

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See detailEffect of aggressive interactions on aromatase activity in discrete brain regions in wild male white-crowned sparrows
Charlier, Thierry ULg; Newman, Amy EM; Soma, Kiran K

Poster (2008)

Testosterone (T) is a critical endocrine factor involved in the activation of aggressive behaviors. In many vertebrate species, circulating T levels rapidly increase after aggressive encounters during the ... [more ▼]

Testosterone (T) is a critical endocrine factor involved in the activation of aggressive behaviors. In many vertebrate species, circulating T levels rapidly increase after aggressive encounters during the breeding season. In contrast, we recently showed that circulating T concentrations did not change in white-crowned sparrows in the late breeding season after simulated territorial intrusions. We suggested that changes in local metabolism of T might be more important than changes in systemic T levels. Neural aromatization of T into 17􀀁-estradiol (E2) often mediates the physiological and behavioral actions of T. In vertebrates, aromatase is expressed in several discrete brain regions. We hypothesized that in the late breeding season, brain aromatase is rapidly modulated after aggressive interaction, leading to changes in local concentrations of E2. Wild male white-crowned sparrows were exposed to simulated territorial intrusion with song playback and decoy (STI) or control (CON) for 30 min. STI significantly increased aggressive behaviors. Birds were then caught, rapidly bled and sacrificed. Brains were collected and rapidly frozen on dry ice. We used 0.9 mm diameter punches from 300 μm coronal sections to isolate 13 different brain nuclei. Aromatase activity was analyzed in punches from the left side of the brain, while E2 was analyzed in punches from the right side of the brain. Aromatase activity was quantified by measuring the release of tritiated water during aromatization of [1􀀁-3H]-androstenedione. As expected, aromatase activity was high in the medial preoptic area, ventromedial nucleus of the hypothalamus, hippocampus, bed nucleus of the stria terminalis, nucleus taeniae of the amygdala, and caudomedial nidopallium. Aromatase activity was low in the medial magnocellular nucleus of anterior nidopallium, HVC, Area X, nucleus robustus of the arcopallium, optic lobes, periaqueductal gray and cerebellum. Aromatase activity was not different between the STI and CON groups in any region. There were no significant correlations between aromatase activity and aggressive behaviors or endocrine measures (plasma T, progesterone, corticosterone and corticosteroid binding globulin). These data provide no evidence for rapid modulation of brain aromatase activity following aggressive interactions. It is however possible that aromatase activity is more rapidly modulated (e.g. within 5 min) and these changes were not observed in our 30 min paradigm. We are currently investigating whether local E2 is affected by aggressive interactions. [less ▲]

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See detailThe tropical sea anemone Aiptasia pallida as a lab model for the study of coral bleaching
Ladrière, Ophélie ULg; Roberty, Stéphane ULg; Baudesson, Charlotte et al

Poster (2008)

Bleaching is still among major events threatening coral reefs. New tools have to be developped to better understand the mechanisms leading to this pathology : we studied the use of the hermatypic anemone ... [more ▼]

Bleaching is still among major events threatening coral reefs. New tools have to be developped to better understand the mechanisms leading to this pathology : we studied the use of the hermatypic anemone Aiptasia pallida as experimental model for coral bleaching. Aiptasia appears as a good candidate as it is easy to maintain in aquarium and subjected to bleaching like corals. Both morphological and physiological approaches were performed to investigate the ultrastructure of the anemone tissues (TEM) and the zooxanthellae photophysiology (chlorophyll a fluorescence, respiration and pigmentation). Experiments under light and dark stress reveal that anemone tissues ultrastructure can be differently affected. In darkness, the ectoderm activity is reoriented to capture prey by increasing cnidocyte density. In contrast, intense light affects especially the gastroderm : intercellular spaces increase, the expulsion of intact algae in the gastric cavity and the degradation of zooxanthellae inside vacuoles seem to reduce the zooxanthellae density, chloroplast thylakoids lose their parallel arrangement. The analysis of the fluorescence induction curve appears as a powerful tool to analyse the physiological events series previous to bleaching. Although no significant zooxanthellae density reduction was observed, the decrease of pigments concentrations indicates that light or dark stresses induce anemone bleaching. Under strong light intensity, A. pallida zooxanthellae show an increased proportion of PSII QB non reducing, leading to partial photoinhibition. This phenomenon favours the ROS production that damages cellular structures of host and zooxanthellae. In darkness, there is no photosynthesis; anemones have therefore to find other feeding sources, as suggested by the ultrastructural approach. As the present results confirm some of those obtained on scleractinians, A. pallida can be regarded as a good model for coral bleaching studies and has numerous advantages for experimentation. [less ▲]

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See detailDevelopment of a technique to measure 17β-estradiol in discrete brain regions in zebra finch
Charlier, Thierry ULg; Po, Kelvin WL; Shah, Amit H et al

Poster (2008)

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See detailAtomic layer doping of phosphorus and arsenic: experimental and atomistic modeling
Takeuchi, Shotaro; Yang, Lijun; Nguyen, Ngoc Duy ULg et al

Poster (2008)

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See detailCesàrolite, a possible member of the birnessite group of minerals
Perchiazzi, Natale; Hatert, Frédéric ULg; Merlino, Stefano et al

Poster (2008)

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See detailCocaïne and metabolites in waste and surface water across Belgium - a monitoring study
Van Nuijs, Alexander; Pecceu, Bert; Gheorghe, A. et al

Poster (2008)

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See detailDevelopment of Procedural Learning in Children : The “Toy Task”
Lejeune, Caroline ULg; Meulemans, Thierry ULg

Poster (2008)

The authors generally agree that procedural learning abilities play an important role in the child development and that they are present early in childhood. However, few studies have been carried out in ... [more ▼]

The authors generally agree that procedural learning abilities play an important role in the child development and that they are present early in childhood. However, few studies have been carried out in this area because of the difficulty to develop tests specifically designed for the evaluation of these capacities in young children. In this study, we presented a new task aimed to evaluate visuo-motor skill learning in the young child. The purpose of the present study was to explore whether procedural learning abilities are present in the same extent in 4-year as 7- and 10-year-old children. Our sample is composed of 60 children divided into 3 age-groups. The task is composed of 5 blocks of 12 trials during which each subject has to use a reversed mouse of a computer in order to “catch” different toys appearing on the screen; 2 blocks of 12 trials was administered after a 15 minutes delay. Our results show an important difference between the groups for the first block; on the other hand, for the next blocks, the results show an absence of age-related difference between participants in our perceptive-motor skill learning task, confirming the idea according to which procedural learning abilities are efficient early in development (the difference observed during the first block being probably due to the intervention of executive mechanisms). [less ▲]

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