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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 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 detailL’apprentissage procédural chez le jeune enfant : présentation d’un nouvel outil d’évaluation
Lejeune, Caroline ULg; Delcourt, Isabelle; 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 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 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 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)

Detailed reference viewed: 35 (6 ULg)
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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 detailKarst in het krijt van Limburg en ombeving
Lagrou, David; Dusart; Willems, Luc ULg

Poster (2008)

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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)

Detailed reference viewed: 37 (11 ULg)
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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 detailFinite element modelling of thermo-elasto-plastic water saturated porous materials
Luison, Loris; François, Bertrand ULg; Bortolotto, Roberto et al

Poster (2008)

Detailed reference viewed: 18 (2 ULg)
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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 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 detailInfluence of environmental conditions on the interfacial organisation of fengycin, a bioactive lipopeptide produced by Bacillus subtilis
Eeman, Marc; Pegado, Luis; Dufrêne, Yves 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 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 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 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 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 detailConformal ultra shallow junctions by vapor phase doping with boron
Nguyen, Ngoc Duy ULg; Leys, Frederik; Takeuchi, Shotaro 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)

Detailed reference viewed: 23 (8 ULg)
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See detailMECHANICAL PRETREATMENT EFFECT ON CELLULOSE ENZYMATICAL HYDROLYSIS
Jacquet, Nicolas ULg; Paquot, Michel ULg

Poster (2008)

Lignocellulosic materials are very interesting for the production of bioethanol after chemical or enzymatical hydrolysis of cellulose. To optimise production rate and increase the output of these ... [more ▼]

Lignocellulosic materials are very interesting for the production of bioethanol after chemical or enzymatical hydrolysis of cellulose. To optimise production rate and increase the output of these processes, different kinds of pre-treatments (grinding, steam explosion…) are often needed for opening the fibrous structure of the cellulose and increase the specific surface of the materials. The present study is focused on two models of “pure” cellulose (cellulose C200 microtechnik, cellulose FD100 FMC biopolymer) in order to analyse the effects of mechanical pretreatments on the kinetics and yields of hydrolysis. The cristallinity index differentiates the two celluloses. Hydrolysis is realized by a cellulase mix (cellulase Trichoderma reesei C2730, Novozyme; cellobiase Aspergillus niger C6105). Results present the influence of homogenisation pretreatment and analyse differents parameters of this technology. [less ▲]

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See detailEffect of the content of partially hydrogenated oils on the physical and structural properties of bakery margarines
Cavillot, V; Danthine, Sabine ULg; Kervyn de meerendré, M. et al

Poster (2008)

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See detailProtection des races animales locales menacées en Région wallonne
Burny, Philippe ULg; Mulders, Christian

Poster (2008)

L'intensification des élevages et la recherche de hautes performances zootechniques a eu notamment pour conséquence la mise en évidence d'un nombre restreint de races sur lesquelles tous les efforts de ... [more ▼]

L'intensification des élevages et la recherche de hautes performances zootechniques a eu notamment pour conséquence la mise en évidence d'un nombre restreint de races sur lesquelles tous les efforts de sélection se sont concentrées. Indirectement, de nombreuses races locales, pourtant bien adaptées à leur milieu spécifique, se sont vues de plus en plus marginalisées, au point même de se voir menacées de disparition. Pour lutter contre cet aspect négatif des progrès de l'élevage, des mesures ont été prises par l'Europe afin d'aider au maintien d'un patrimoine génétique potentiellement intéressant pour l'avenir. [less ▲]

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See detailThe nucleolus in reptiles: Ultrastructural studies
Lamaye, F; Thiry, Marc ULg

Poster (2008)

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See detailModel of Irrigation Development for Floodplain of the Tonle Sap Great Lake
someth, Paradis; Kubo, n; Ly, Sarann ULg et al

Poster (2008)

Rice is a staple crop in Cambodia. To meet the large requirement of rice consumption due to rapid increased population and to boost the economy, the rice production in this country needs to be enhanced ... [more ▼]

Rice is a staple crop in Cambodia. To meet the large requirement of rice consumption due to rapid increased population and to boost the economy, the rice production in this country needs to be enhanced. The Tonle Sap Great Lake of Cambodia has huge floodplain suitable for large amount for rice production and potential water resources for rice-based farming system. Due to large variation of water level of the lake, some areas around the lake are flooded in wet season and shortage of water in dry season. Studies to exploit the flood and the water rsources of the lake and its tributaries have not been well conducted yet. The West Baray and Batheay irrigation systems are located in the floodplain of the Tonle Sap Great Lake and the Mekong River. In this research, the irrigation systems are studied as model sites for future development of the floodplain of the Tonle Sap Great Lake. [less ▲]

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See detailAphid honeydew is not only a sugary and amino-acid secretion
Leroy, Pascal ULg; Heuskin, Stéphanie ULg; Sabri, Ahmed ULg et al

Poster (2008)

Aphids, feeding from the phloem sap of plants, are the most common honeydew producing insects. This aphid excretory product consists in an aqueous mixture of different chemical compounds of which the most ... [more ▼]

Aphids, feeding from the phloem sap of plants, are the most common honeydew producing insects. This aphid excretory product consists in an aqueous mixture of different chemical compounds of which the most important are sugars (90-95% of the dry weight) and amino acids. This excretory product, used by parasitoids and predators, plays a crucial role in the tritrophic interactions : (1) honeydew is an important food complement and (2) honeydew acts as a volatile and a contact kairomone. These characteristics could be exploited for enhancing the biological control in fields through the use of an « artificial honeydew ». [less ▲]

Detailed reference viewed: 105 (33 ULg)
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See detailPhilopatry of the Bank swallow (Riparia riparia) in Belgium : analysis of ringing recoveries.
Dardenne, Sophie ULg; Devillers, P.; Lafontaine, R.M. et al

Poster (2008)

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See detailMultiplicity of O-type stars in NGC 2244
Mahy, Laurent ULg; Nazé, Yaël ULg; Rauw, Grégor ULg et al

Poster (2008)

We present the main results from our long‐term spectroscopic campaign devoted to the O‐type stars in the young open cluster NGC 2244. Previous works by our team on the O‐stars multiplicity in other young ... [more ▼]

We present the main results from our long‐term spectroscopic campaign devoted to the O‐type stars in the young open cluster NGC 2244. Previous works by our team on the O‐stars multiplicity in other young open clusters (IC 1805 and NGC 6231) showed that the number of binary systems in such clusters was larger than 40%. Until now, only two stars (HD 47129 and HD 48099) in the surroundings of NGC 2244 have been confirmed as spectroscopic binaries (SB) although Garcia & Mermilliod (2001) estimated the O‐type binary fraction at 50%. In this context, we revisited the spectral classification, the projected rotational velocity and the multiplicity of O‐type stars in NGC 2244. [less ▲]

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See detailA blue oxidase from the white continent
Roulling, Fredéric; Verté, F.; Feller, Georges ULg

Poster (2008)

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See detailImportance des aides aux vaches allaitantes dans le revenu agricole en Région wallonne
Delille, Nicolas ULg; Bouquiaux, J. M.; Closset, M. F. et al

Poster (2008)

Detailed reference viewed: 39 (14 ULg)
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See detailEmission of alarm pheromone in aphids: A contagious phenomenon?
Verheggen, François ULg; Mescher, Mark; Francis, Frédéric ULg et al

Poster (2008)

Detailed reference viewed: 10 (1 ULg)
See detailE. coli HU dimers dynamics studied by NMR
Augustyniak, R.; Damblon, Christian ULg; Castaing, B.

Poster (2008)

HU is a 2x90 residues, dimeric bacterial histone-like protein involved in chromosome compaction and other DNA-related processes. E. coli HU proteins are composed of three forms: two homodimers α2 and β2 ... [more ▼]

HU is a 2x90 residues, dimeric bacterial histone-like protein involved in chromosome compaction and other DNA-related processes. E. coli HU proteins are composed of three forms: two homodimers α2 and β2 (α and β sharing 70% of sequence identity) and one heterodimer (αβ). Dimeric forms relative abundance varies during cell growth and in response to environmental changes, suggesting that each dimer plays different physiological roles. Unlike other HU proteins which melt through a single step (N2<=>2D), E. coli dimers melt according to a two-step mechanism (N2<=>I2<=>2D). The native dimer, N2, melts partially into a dimeric intermediate, I2, which in turn yields the unfolded monomers, D. Circular Dichroism studies indicate that the intermediate, I2, corresponds to an HU dimer having partly lost its a-helices. Here we compared dynamic properties and structural features of E. Coli HU dimers at different temperatures in order to determine the secondary strutural elements still present in the I2 intermediate. Isotopically labelled proteins (15N, 13C) have been used to perform backbone assignment for all dimeric forms using sequential triple-resonance experiments. 15N-HSQC at different temperatures (288-323K) were recorded .Intensity variations and chemical shift perturbations allow the identification of the secondary element lost in the intermediate I2 confirming the high dynamics of arms responsible for protein-DNA interactions and the thermal stability of HTH motif in all dimeric forms. [less ▲]

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See detailHypoxia promotes resistance to etoposide by regulating p53 stability and c-jun DNA-binding activity
Cosse, Jean-Philippe ULg; Ronvaux, Marie; Ninane, Noelle et al

Poster (2008)

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See detailInfluence of natural and synthetic peptides on biomimetic membranes
Kouzayha, Achraf; Wattraint Olivier; Nasir, Mehmet Nail ULg et al

Poster (2008)

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See detailCytochemical and immunocytological study of the reptilian nucleolus
Lamaye, Françoise; Thiry, Marc ULg

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 detailPresence of six bee viruses in Apis mellifera L. populations in Wallonia (Belgium)
Mignon, Jacques ULg; Snoeck, Chantal; Nguyen, Bach Kim ULg et al

Poster (2008)

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See detailAgreement between two independent groups of raters
Vanbelle, Sophie ULg

Poster (2008)

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See detailHolocene records of regional dust deposition using peat bogs
Le Roux, G.; De Vleeschouwer, F.; Cheburkin, A. et al

Poster (2008)

Detailed reference viewed: 16 (1 ULg)
See detailHolocene instabilities in GIN sea overflows based on mineralogical and Nd/Pb isotopic sedimentary records
Simon, Q.; Fagel, Nathalie ULg; Jennings, A. et al

Poster (2008)

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See detailSedimentological Fingerprints of Recent Earthquakes in Lake Sediments: A Case Study on the North Anatolian Fault (NAF), Turkey
Avsar, U.; Boes, X.; Hubert-Ferrari, A. et al

Poster (2008)

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See detailIntercomparison of lead 210 and radiocarbon bomb pulse age models. A key study in a peat bog core from North Poland
Piotrowska, Natalia; De Vleeschouwer, François; Sikorski, Jaroslaw et al

Poster (2008)

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See detailTraces of the last earthquake sequence (1939-1944) along NAF from lacustrine sediments.
Avsar, U.; Boes, X.; Hubert-Ferrari, A. et al

Poster (2008)

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See detailSTUDY OF PEGYLATED LIPOSOMES CRYOPROTECTION IN TERMS OF RETENTION EFFICIENCY
Ducat, Emilie ULg; Evrard, Brigitte ULg; Piel, Géraldine ULg

Poster (2008)

Purpose: Print 3G, a peptidic antagonist of oncoproteins involved in breast cancer, was encapsulated in PEGylated liposomes. Seeing its temperature instability, this peptide must be stored at – 20°C. In ... [more ▼]

Purpose: Print 3G, a peptidic antagonist of oncoproteins involved in breast cancer, was encapsulated in PEGylated liposomes. Seeing its temperature instability, this peptide must be stored at – 20°C. In this study, the cryoprotection of PEGylated liposomes was investigated to ensure their stability in terms of size and retention capacity when frozen. Calcein, a self-quenching fluorescent marker encapsulated in liposomes, was used as a tracer of liposome integrity. The release of calcein was studied before and after freezing, with or without cryoprotectants at several concentrations. Methods: Unilamellar vesicles made of SPC:CHOL:mPEG-750-DSPE (47:47:6) or SPC:CHOL:mPEG-2000-DSPE (47:47:6) were prepared by the film evaporation method. Size of the liposomes dispersions containing a cryoprotectant (sucrose, trehalose or lysine) at various concentrations were measured by photon correlation spectroscopy before and after freezing. From these results, two cryoprotectants (at the best molar ratio of sugar-to-lipid) were chosen for future experiments with calcein. Its release from the inner cavity of liposomes was measured fluorometrically before and after freezing, with or without cryoprotectant. The percentage of calcein retained was determined at excitation and emission wavelengths of 490 and 520 nm, respectively. The liposomes were prepared with cryoprotectant either only outside the vesicles or both inside and outside. Results: In regards to the results obtained with PCS, sucrose and trehalose (molar ratio of sugar-to-lipid = 4) were selected for calcein experiments. The best results in terms of retention efficiency were obtained using cryoprotectant inside and outside the vesicles. Liposomes containing mPEG-750-DSPE show the best retention efficiency after freezing with trehalose (75.42 ± 2.39 %, n=3) in comparison with sucrose (62.16 ± 4.34 %, n=3). Liposomes containing mPEG-2000-DSPE doesn’t show significant difference (T-Test) between trehalose (84.27 ± 5.05%, n=3) and sucrose (83.38 ± 3.18 %, n=3). In the future experiments, these results will be compared with experiments of frozen liposomes encapsulating Print 3G. Acknowledgements: This work was supported by the Ministry of the Walloon Region. [less ▲]

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See detailHistology and ultrastructure of the elastic spring apparatus in Acanthodoras cataphractus (Siluriformes: Doradidae)
Fabri, Grégory; Thiry, Marc ULg; Parmentier, Eric

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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See detailAphids adapt their alarm pheromone production according 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 detailRecent climatic instability in Poland and effect of Little Ice Age on human activities
De Vleeschouwer, F.; Lamentovicz, M.; Piotrowska, N. et al

Poster (2008)

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See detailDevelopment of a "pre-anthropogenic" peat standard for geochemical, paleo-environmental and archaeological investigations
Le Roux; De Vleeschouwer, F.; Cheburkin et al

Poster (2008)

Detailed reference viewed: 3 (0 ULg)