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See detailAttacks by a piercing-sucking insect (Myzus persicae Sultzer) or a chewing insect (Leptinotarsa decemlineata Say) on potato plants (Solanum tuberosum L.) induce differential changes in volatile compound release and oxylipin synthesis
Gosset, Virginie; Harmel, Nicolas; Goebel, Cornelia et al

in Journal of Experimental Botany (2009), 60(4), 1231-1240

Plant defensive strategies bring into play blends of compounds dependent on the type of attacker and coming from different synthesis pathways. Interest in the field is mainly focused on volatile organic ... [more ▼]

Plant defensive strategies bring into play blends of compounds dependent on the type of attacker and coming from different synthesis pathways. Interest in the field is mainly focused on volatile organic compounds (VOCs) and jasmonic acid (JA). By contrast, little is known about the oxidized polyunsaturated fatty acids (PUFAs), such as PUFA-hydroperoxides, PUFA-hydroxides, or PUFA-ketones. PUFA-hydroperoxides and their derivatives might be involved in stress response and show antimicrobial activities. Hydroperoxides are also precursors of JA and some volatile compounds. In this paper, the differential biochemical response of a plant against insects with distinct feeding behaviours is characterized not only in terms of VOC signature and JA profile but also in terms of their precursors synthesized through the lipoxygenase (LOX)-pathway at the early stage of the plant response. For this purpose, two leading pests of potato with distinct feeding behaviours were used: the Colorado Potato Beetle (Leptinotarsa decemlineata Say), a chewing herbivore, and the Green Peach Aphid (Myzus persicae Sulzer), a piercing-sucking insect. The volatile signatures identified clearly differ in function with the feeding behaviour of the attacker and the aphid, which causes the smaller damages, triggers the emission of a higher number of volatiles. In addition, 9-LOX products, which are usually associated with defence against pathogens, were exclusively activated by aphid attack. Furthermore, a correlation between volatiles and JA accumulation and the evolution of their precursors was determined. Finally, the role of the insect itself on the plant response after insect infestation was highlighted. [less ▲]

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See detailAre rapid changes in gonadal testosterone release involved in the fast modulation of brain estrogen effects?
Cornil, Charlotte ULg; Stevenson, Tyler J; Ball, Gregory F

in General and Comparative Endocrinology (2009)

Estradiol facilitates the expression of male sexual behavior in Japanese quail within a few minutes. These rapid behavioral effects of estradiol could result from rapid changes in its local production in ... [more ▼]

Estradiol facilitates the expression of male sexual behavior in Japanese quail within a few minutes. These rapid behavioral effects of estradiol could result from rapid changes in its local production in the preoptic area by aromatase, the enzyme converting testosterone into estradiol. Alternatively, aromatase activity may remain constant but fluctuations of local estradiol production could arise from rapid changes in the concentration of the enzymatic substrate, namely testosterone. Rapid increases of circulating testosterone levels have been observed in males of various species following social encounters. Surprisingly, in quail, the interaction with a female seems to result in a decrease in circulating testosterone levels. However, in that study conducted in quail, the samples were collected at intervals longer than the recently observed rapid effects of estradiol on sexual behavior. In the present study we investigated whether plasma testosterone concentrations fluctuate on a shorter time-frame. Eleven male were tested 5 min before and 5, 15 or 30 min after being allowed to have visual access to a female or to copulate with a female for 5 min. Both types of interactions resulted in a significant decline in circulating testosterone levels at latencies as short as 5 min. These data demonstrate that the decrease in testosterone levels is initiated shortly after sexual encounters. Because visual interactions with a female did not result in a rapid increase in testosterone concentrations, these findings rule out the possibility that a rapid rise in circulating testosterone levels participates in the rapid increase in brain estrogen synthesis and its facilitatory effects on copulatory behavior. [less ▲]

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See detailInnate lymphocytes in human papillomavirus (HPV)-associated cervical cancers
Renoux, V; Bisig, B; Thiry, Marc ULg et al

Poster (2009)

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See detailAn iterative approach for the solution of multiple-scattering problems at high-frequencies using finite elements
Geuzaine, Christophe ULg

in Proceedings of the conference The Mathematics of Finite Elements and Applications (MAFELAP 2009) (2009)

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See detailEntre pays mosan et Champagne. Le trésor des reliques de Montier-en-Der
George, Philippe ULg

in Cahiers Archéologiques (2009)

Circulation des biens et des personnes au Moyen Age : l’étude des reliques comme objets historiques permet des recoupements extraordinaires, souvent insoupçonnés et très utiles, notamment pour l’histoire ... [more ▼]

Circulation des biens et des personnes au Moyen Age : l’étude des reliques comme objets historiques permet des recoupements extraordinaires, souvent insoupçonnés et très utiles, notamment pour l’histoire de l’art. Stavelot-Malmedy a réformé Montier-en-Der en Champagne au IXe siècle. Curieusement la liste des confraternités de l’abbaye de Stavelot-Malmedy (Cfr Commission Royale d’Histoire) ne mentionne pas Montier. C’est ailleurs qu’il faut rechercher les liens avec l’abbaye champenoise. Trois découvertes importantes font l’objet de cet article : les vestiges d’un important reliquaire mosan du Der, conservé aujourd’hui dans une collection privée anglaise, une mention supplémentaire d’Erlebald, frère de l’abbé Wibald, à ajouter au précédent inventaire (Le Moyen Age) et toujours l'orfèvre Godefroid de Huy ( Cfr Cahiers de Civilisation Médiévale). L’article aboutit à la reconstitution d’un important trésor bénédictin. [less ▲]

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See detailCurvilinear mesh generation for CFD
Remacle, J.-F.; Geuzaine, Christophe ULg; Hillewaert, K.

in Proceedings of the 11th International Society of Grid Generation Conference (ISSG 2009) (2009)

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See detailDosage des pepsinogènes A et C dans le sang pour diagnostiquer les verminoses gastro-intestinales chez le bovin
Beckers, Jean-François ULg; Melo de Sousa, Noelita ULg; Dufrasne, Michel et al

in Nouvelles du Printemps (Les) (2009), (2e trimestre), 32-33

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See detailInsuline glargine et cancer: une tempete dans un verre d'eau?
Scheen, André ULg; Lefebvre, Pierre ULg

in Revue Médicale de Liège (2009), 64(9), 440-5

Insulin glargine is widely used as basal insulin in the treatment of type 1 and type 2 diabetes mellitus. However, this insulin analogue has been recently suspected to be associated with an increased risk ... [more ▼]

Insulin glargine is widely used as basal insulin in the treatment of type 1 and type 2 diabetes mellitus. However, this insulin analogue has been recently suspected to be associated with an increased risk of cancer, especially breast cancer, in patients with type 2 diabetes. The present article aims at briefly presenting the state of the art based upon currently available data. We will first summarize the observations reported in recent publications, then we will present a critical analysis of these in fact non-conclusive findings, and finally we will conclude with some practical recommendations. [less ▲]

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See detailGeneralized Cloaking and Optical Polyjuice
Nicolet, A.; Zolla, F.; Geuzaine, Christophe ULg

in Proceedings of the 8th conference on Electrical, Transport and Optical Properties of Inhomogeneous Media (ETOPIM 8) (2009)

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See detailAnalyse de l'effet du type de tâche sur l'évolution des connaissance à la suite d'un processus d'apprentissage collaboratif
Dejean, Karine ULg

in Revue Internationale de Pédagogie de l'Enseignement Supérieur (2009)

Cette recherche longitudinale analyse l’effet du type de tâche sur l’évolution des connaissances à la suite d’un processus d’interaction. Deux types de tâches sont analysées. La méthode de collecte des ... [more ▼]

Cette recherche longitudinale analyse l’effet du type de tâche sur l’évolution des connaissances à la suite d’un processus d’interaction. Deux types de tâches sont analysées. La méthode de collecte des données consiste en un entretien semi-directif. Les résultats montrent que les groupes se distinguent selon le type de tâche qui leur est assigné [less ▲]

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See detail"Moy, Christine", Mémoires glorieuses et mémoire du moi: Christine de Pizan et la mémoire posthume
Dor, Juliette ULg

in Delgleize, Nathalie; Bertrand, Jean-Pierre; Renouprez, Martine (Eds.) Mémoires (2009)

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See detailLa guerra dei Sei Giorni: lunedì, il giorno dell’attacco
Cuau, Ives; Ricciardi, Stefania ULg

in Barillari, Simone (Ed.) La guerra a un passo (2009)

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See detailCurvilinear mesh generation for CFD
Remacle, J.-F.; Geuzaine, Christophe ULg; Hillewaert, K.

in Proceedings of the International Conference on Spectral and High Order Methods (ICOSAHOM 2009) (2009)

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See detailDo Personality Traits Modulate the Effect of Emotional Visual Stimuli on Auditory Information Processing?
Mardaga, Solange; Hansenne, Michel ULg

in Journal of Individual Differences (2009), 30(1), 28-34

Several lines of evidence attest robust relationships between personality dimensions and emotions, including cognitive aspect of emotion. More particularly, many studies reported strong relationships ... [more ▼]

Several lines of evidence attest robust relationships between personality dimensions and emotions, including cognitive aspect of emotion. More particularly, many studies reported strong relationships between extraversion, the behavioral activation system (BAS), and the cognitive processing of positive information, on the one hand, and between neuroticism, the behavioral inhibition system (BIS), and the processing of negative information, on the other hand. Recently, DePascalis, Awari, Matteucci, and Mazzocco (2005) reported that personality traits modulated the effect of the emotional visual stimuli on the mismatch negativity (MMN). The aim of the present study was to replicate these data and extend them to other personality dimensions. Auditory MMN was recorded in normal subjects simultaneously to the presentation of emotional pictures selected as neutral, positive, or negative from the International Affective Picture System, and presented in randomized order. The results support the recent finding that personality (namely, BIS and harm avoidance) modulates the influence of emotional (negative) context on auditory information processing. The present findings suggest that the modulation by personality of change detection in the unattended environment as a function of context valence is limited to unpleasant context. [less ▲]

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See detailAg-and SiO2-doped porous TiO2 with enhanced thermal stability
Braconnier, Benoît ULg; Páez Martínez, Carlos ULg; Lambert, Stéphanie ULg et al

in Microporous and Mesoporous Materials (2009), 122

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See detailEarly land plant evolution: a tremendous success story.
Gerrienne, Philippe ULg

Conference (2009)

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See detailFood resources unconventional use for poultry production in Africa: nutritional values and constraints
Dahouda, M.; Toleba, S. S.; Senou, M. et al

in Annales de Médecine Vétérinaire (2009), 153(1), 5-21

Numerous works are related to the use of unconventional feed resources, and particularly to Mucuna Spp., in poultry diet. This review aims at describing the context of their use, their nutritional values ... [more ▼]

Numerous works are related to the use of unconventional feed resources, and particularly to Mucuna Spp., in poultry diet. This review aims at describing the context of their use, their nutritional values and the constraints related to their upgrading, before considering the effects of the various methods of treatment on the reduction of the toxic substances that they could contain and on their chemical compositions. The methods of treatment are very variable and their standardisation should allow using them in rural area. Those feed could thus constitute an alternative to costly conventional feed usually used in poultry production. [less ▲]

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See detailSir Stirling Moss
Donnay, Jean-Paul ULg

Article for general public (2009)

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