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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 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 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 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 detailReintroduction & effects on their environment of indigenous plants of the Cerrado
Buisson, Elise; Le Stradic, Soizig ULg; Negreiros, Daniel 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 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 detailIsolation of novel hydrolytic genes from an Antarctic metagenomic library
Pipers, D.; Berlemont, R.; Power, P. et al

Poster (2008)

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See detailContrastief taalonderzoek geïntegreerd aanpakken: hoe en waarom?
Rasier, Laurent ULg; Hiligsmann, Philippe; Baelen, Mélanie 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 detailPhosphorylation of huntingtin by cyclin dependent kinase 5.
Godin, Juliette ULg; Anne, Sandrine; Humbert, Sandrine

Poster (2008)

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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 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 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 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)

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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 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 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 detailKarst in het krijt van Limburg en ombeving
Lagrou, David; Dusart; Willems, Luc ULg

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

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

Poster (2008)

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See detailA Critical Study of Primate Reintroduction Projects in the Mesoamerican Region.
Martin, Sarah ULg; Huynen, Marie-Claude ULg; Libois, Roland ULg

Poster (2008)

Very little is known about primate reintroduction projects in Mesoamerica. The aim of this study was to focus on existing projects concerning primate re-introductions, conservation-introduction ... [more ▼]

Very little is known about primate reintroduction projects in Mesoamerica. The aim of this study was to focus on existing projects concerning primate re-introductions, conservation-introduction, translocation, as well as on reinforcement-supplementation of parallel initiatives. In order to create a database, a survey was sent to a panel of scientists in Mexico, Belize, Guatemala, Honduras, El Salvador, Nicaragua, Costa Rica and Panama, and we visited five projects in Costa Rica from March to August 2006. A total of 19 projects were found: Costa Rica hosted the higher number (7) while Salvador and Nicaragua did not host any. Fourteen out of those 19 projects concerned confiscated animals. Six of the 7 Costa Rican projects used confiscated primates; the other ones came from wild populations or were born in captivity. Alouatta palliata and Ateles geoffroyi are the most common species subject to reintroduction effort in the Mesoamerican region. A wide range of factors seem to influence reintroduction success such as: the project’s budget, the release site, the mode of transportation, the caging setting, the support from local communities, the presence of environmental education programs, but also the age of primates, etc. Each project seems to work as a completely separated entity, with its own definition of reintroduction success and its own policy. There’s no communication between the projects, no matter if they are based in the same country or work on the same species. A reintroduction guideline for this region should be established as well as a regional network coordinating the information. [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 ▲]

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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)

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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)

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