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See detailHow Does Pollen Chemistry Impact Development and Feeding Behaviour of Polylectic Bees?
Vanderplanck, Maryse; Moerman, Romain; Rasmont, Pierre et al

in PLoS ONE (2014), 9(1), 9

Larvae and imagos of bees rely exclusively on floral rewards as a food source but host-plant range can vary greatly among bee species. While oligolectic species forage on pollen from a single family of ... [more ▼]

Larvae and imagos of bees rely exclusively on floral rewards as a food source but host-plant range can vary greatly among bee species. While oligolectic species forage on pollen from a single family of host plants, polylectic bees, such as bumblebees, collect pollen from many families of plants. These polylectic species contend with interspecific variability in essential nutrients of their host-plants but we have only a limited understanding of the way in which chemicals and chemical combinations influence bee development and feeding behaviour. In this paper, we investigated five different pollen diets (Calluna vulgaris, Cistus sp., Cytisus scoparius, Salix caprea and Sorbus aucuparia) to determine how their chemical content affected bumblebee colony development and pollen/syrup collection. Three compounds were used to characterise pollen content: polypeptides, amino acids and sterols. Several parameters were used to determine the impact of diet on micro-colonies: (i) Number and weight of larvae (total and mean weight of larvae), (ii) weight of pollen collected, (iii) pollen efficacy (total weight of larvae divided by weight of the pollen collected) and (iv) syrup collection. Our results show that pollen collection is similar regardless of chemical variation in pollen diet while syrup collection is variable. Micro-colonies fed on S. aucuparia and C. scoparius pollen produced larger larvae (i.e. better mates and winter survivors) and fed less on nectar compared to the other diets. Pollen from both of these species contains 24-methylenecholesterol and high concentrations of polypeptides/total amino acids. This pollen nutritional “theme” seems therefore to promote worker reproduction in B. terrestris micro-colonies and could be linked to high fitness for queenright colonies. As workers are able to selectively forage on pollen of high chemical quality, plants may be evolutionarily selected for their pollen content, which might attract and increase the degree of fidelity of generalist pollinators, such as bumblebees. [less ▲]

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See detailL'évaluation de la mémoire implicite
Adam, Stéphane ULg

in Seron, Xavier; Van der Linden, Martial (Eds.) Traité de neuropsychologie clinique de l'adulte (Tome 1: Evaluation) (2014)

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See detailL’INTÉRÊT DE LA RADIOTHÉRAPIE «ABLATIVE» EN PRENANT COMME MODÈLE LA MÉTASTASE D’UN CANCER RÉNAL À CELLULES CLAIRES
COUCKE, Philippe ULg; JANVARY, Zsolt Levente ULg; JANSEN, Nicolas ULg

in Revue Médicale de Liège (2014), 69(Supp 1), 94-100

La radiothérapie en conditions stéréotaxiques, guidée par l’imagerie embarquée, est une alternative valable aux autres modalités de traitement ablatif, en particulier dans le contexte du cancer rénal ... [more ▼]

La radiothérapie en conditions stéréotaxiques, guidée par l’imagerie embarquée, est une alternative valable aux autres modalités de traitement ablatif, en particulier dans le contexte du cancer rénal métastatique (mRCC). L’efficacité du traitement dépend de la dose totale et la dose par fraction et se traduit en Dose Biologique Efficace (BED). Les tech - niques actuelles permettent d’appliquer des doses par frac - tion élevée (> 8 à 10 Gy), ce qui se traduit en effet biologique fondamentalement différent de celui observé dans le contexte d’une radiothérapie conventionnelle, résultant en un taux de réponse local atteignant 80 à 90%. Ce taux de réponse contre - dit le concept historique de tumeur «radiorésistante». L’effet thérapeutique s’explique en partie par un effet anti-angiogé - nique majeur induit par la réponse apoptotique des cellules endothéliales dans la tumeur. Ceci ouvre de nouvelles perspec - tives, en particulier dans le domaine des traitements combi - nant radiothérapie ablative et substances anti-angiogéniques. [less ▲]

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See detailPhysiological and proteomic responses of different willow clones (Salix fragilis x alba) exposed to dredged sediment contaminated by heavy metals
Evlard, Aricia ULg; Sergeant, Kjell; Ferrandis, Salvador et al

in International Journal of Phytoremediation (2014), 16(11), 1148-1169

High biomass producing species are considered as tools for remediation of contaminated soils. Willows (Salix spp.) are prominent study subjects in this regard. In this study, different willow clones ... [more ▼]

High biomass producing species are considered as tools for remediation of contaminated soils. Willows (Salix spp.) are prominent study subjects in this regard. In this study, different willow clones (Salix fragilis x alba) were planted on heavy-metal polluted dredging sludge. A first objective was assessment of the biomass production for these clones. Using a Gupta statistic, four clones were identified as high biomass producers (HBP). For comparison, a group of four clones with lowest biomass production were selected (LBP). A second objective was to compare metal uptake as well as the physiological and proteomic responses of these two groups. All these complementary data's allow us to have a better picture of the health of the clones that would be used in phytoremediation programs. Cd, Zn, and Ni total uptake was higher in the HBPs but Pb total uptake was higher in LBPs. Our proteomic and physiological results showed that the LBPs were able to maintain cellular activity as much as the HBPs although the oxidative stress response was more pronounced in the LBPs. This could be due to the high Pb content found in this group although a combined effect of the other metals cannot be excluded. [less ▲]

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See detailA Fast Newton-Raphson Method in Stochastic Linearization
Canor, Thomas ULg; Blaise, Nicolas ULg; Denoël, Vincent ULg

in Proceedings of the Ninth International Conference on Structural Dynamics (2014)

Owing to its accessible implementation and rapidity, the equivalent linearization has become a common probabilistic approach for the analysis of large-dimension nonlinear structures, as encountered in ... [more ▼]

Owing to its accessible implementation and rapidity, the equivalent linearization has become a common probabilistic approach for the analysis of large-dimension nonlinear structures, as encountered in earthquake and wind engineering. It consists in replacing the nonlinear system by an equivalent linear one, by tuning the parameters of the equivalent system, in order to minimize some discrepancy error. Consequently classical analysis tools such as the spectral analysis may be reconditioned to approximate the solution of structures with slight to moderate nonlinearities. The tuning of the equivalent parameters requires the solution of a set of nonlinear algebraic equations involving integrals. It is typically performed with the fixed-point algorithm, which is known to behave poorly in terms of convergence. We therefore advocate for the use and implementation of a Newton-Raphson approach, which behaves much better, even in its dishonest formulation. Unfortunately, this latter option requires the costly construction of a Jacobian matrix. In the approach described in this paper, this issue is answered by introducing a series expansion method that provides a fast and accurate estimation of the residual function (whose solution provides the equivalent parameters) and a fast and approximate estimation of the Jacobian matrix. An illustration demonstrate the good accuracy obtained with the proposed method. [less ▲]

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See detailDemography
Diepart, Jean-Christophe ULg

in Save Cambodia's Wildlife (Ed.) Atlas of Cambodia: Maps on Socio-Economic Development and Environment (2014)

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See detailBouncing dynamics of a spring
Hubert, Maxime ULg; Ludewig, François ULg; Dorbolo, Stéphane ULg et al

in Physica D: Nonlinear Phenomena (2014), 272

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See detailMesenchymal stromal cell therapy in conditions of renal ischaemia/reperfusion.
Erpicum, Pauline; Detry, Olivier; Weekers, Laurent et al

in Nephrology Dialysis Transplantation (2014)

Acute kidney injury (AKI) represents a worldwide public health issue of increasing incidence, with a significant morbi-mortality. AKI treatment mostly relies on supportive manoeuvres in the absence of ... [more ▼]

Acute kidney injury (AKI) represents a worldwide public health issue of increasing incidence, with a significant morbi-mortality. AKI treatment mostly relies on supportive manoeuvres in the absence of specific target-oriented therapy. The pathophysiology of AKI commonly involves ischaemia/reperfusion (I/R) events, which cause both immune and metabolic consequences in renal tissue. Similarly, at the time of kidney transplantation (KT), I/R is an unavoidable event which contributes to early graft dysfunction and enhanced graft immunogenicity. Mesenchymal stromal cells (MSCs) represent a heterogeneous population of adult, fibroblast-like multi-potent cells characterized by their ability to differentiate into tissues of mesodermal lineages. Because MSC have demonstrated immunomodulatory, anti-inflammatory and tissue repair properties, MSC administration at the time of I/R and/or at later times has been hypothesized to attenuate AKI severity and to accelerate the regeneration process. Furthermore, MSC in KT could help prevent both I/R injury and acute rejection, thereby increasing graft function and survival. In this review, summarizing the encouraging observations in animal models and in pilot clinical trials, we outline the benefit of MSC therapy in AKI and KT, and envisage their putative role in renal ischaemic conditioning. [less ▲]

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See detailOn the observability of the quark orbital angular momentum distribution
Courtoy, Aurore ULg; Goldstein, Gary R.; Hernandez, J. Osvaldo Gonzalez et al

in Physics Letters B (2014), 731(0), 141-147

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See detailMind the Gaps: Caryl Phillips’s In the Falling Snow (2009) and the Generational Approach to the Black Diaspora
Ledent, Bénédicte ULg

in Misrahi-Barak, Judith; Raynaud, Claudine (Eds.) Diasporas, Cultures of Mobilities, 'Race', Volume 1 'Diasporas and Cultures of Migrations' (2014)

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See detailTowards robust GWAS/GWAI protocol development for epistasis detection in context of real-life datasets
Bessonov, Kyrylo ULg

E-print/Working paper (2014)

The genome-wide association and interaction studies are a common practice these days but the correct application of statistical methods and workflows that consciously select best data processing ... [more ▼]

The genome-wide association and interaction studies are a common practice these days but the correct application of statistical methods and workflows that consciously select best data processing strategies is often missing in many GWA studies. Nevertheless given the multitude of such studies there is little consistency and consensus in data processing workflows and quality control steps. Data selection and filtering is often overlooked or poorly documented. Many times the default settings are blindly used disregarding any adjustments and/or optimizations under the context of specific dataset. In present study we want to bring awareness of paying a closer attention to parameter selection in genome-wide association interaction studies (GWAI). We had tested the impact of LD filtering, selection of epistasis algorithms (BOOST, MB-MDR) and marker selection and prioritization strategies on the final results variability under the context of the Ankylosin Spondolytis (AS) dataset obtained from WTCCC2 [1]. [less ▲]

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See detailLes dieux et la cité. Représentations des divinités tutélaires entre Grèce et Phénicie
Bonnet, Corinne; Pirenne-Delforge, Vinciane ULg

in Zenzen, Nicolas; Hölscher, Tonio; Trampedach, Kai (Eds.) Aneignung und Abgrenzung. Wechselnde Perspektiven auf die Antithese von ‘Ost’ und ‘West’ in der griechischen Antike (2014)

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See detailChâteau fort d’Ecaussinnes-Lalaing (Hainaut) : de nouveaux matériaux pour une chronologie du bâti
Maggi, Christophe ULg; Blain, Sophie ULg; Bavay, Gérard et al

in Bulletin de la Commission royale des Monuments, Sites et Fouilles (2014), 25

Situé dans le Hainaut, dominant le vallon de la Senette, le château-fort d’Écaussinnes a fait l’objet de diverses monographies. Pourtant, bien des études du bâti restent à faire, dans la foulée de la plus ... [more ▼]

Situé dans le Hainaut, dominant le vallon de la Senette, le château-fort d’Écaussinnes a fait l’objet de diverses monographies. Pourtant, bien des études du bâti restent à faire, dans la foulée de la plus récente que l’on doit à Philippe Sosnowska. En mars 2012, une étude typologique et dendrochronologique des charpentes, à l’occasion de travaux de restauration aux toitures, apporte quelques éléments nouveaux. L’analyse porte sur les charpentes de toiture de la chapelle et des ailes ouest et nord. Elle a été demandée par les architectes Paul Delaisse et Michel Micciche dans le cadre de la restauration des toitures. [less ▲]

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See detailGuerre primitive, primitivisme esthétique et regard d'enfant
Vanden Berghe, Kristine ULg

in Küpper, Achim; Vanden Berghe, Kristine (Eds.) Guerre et jeu (2014)

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See detailReprésentation du couvert forestier dans la modélisation hydrologique : Comparaison de dix modèles
Deraedt, Deborah ULg; Colinet, Gilles ULg; Claessens, Hugues ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2014), 18(1), 83-96

There are many hydrological models, some of which can be used for forested environments. This review aims to compare ten of them (BILJOU, EPIC, BROOK90, SWAT, RHESSys, MIKE SHE, SHETRAN, WaSiM ETH, DHSVM ... [more ▼]

There are many hydrological models, some of which can be used for forested environments. This review aims to compare ten of them (BILJOU, EPIC, BROOK90, SWAT, RHESSys, MIKE SHE, SHETRAN, WaSiM ETH, DHSVM et Hydrus) to guide the choice. The compared fluxes are the interception, the transpiration and the root water uptake, the root distribution, the undercover effect, the tree growth and the model validation. The review underlines that each model deals with the forest fluxes in different ways. Most of the time, interception is similarly dealt by the models and the root distribution is used in the process of root water uptake. Understory and growth are seldom considered. [less ▲]

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See detailSustainability and the built environment: urban form and location matter
Marique, Anne-Françoise ULg

Scientific conference (2014)

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See detailSurgical treatment of bicuspid aortic valve disease: Knowledge gaps and research perspectives.
Della Corte, Alessandro; Body, Simon C.; Booher, Anna M. et al

in The Journal of thoracic and cardiovascular surgery (2014)

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See detailÉléments optiques biréfringents pour interféromètre à chemins optiques quasi-communs
Blain, Pascal ULg

Doctoral thesis (2014)

Notre étude porte sur l’utilisation de composants optiques biréfringents en tant qu’élément séparateur dans un interféromètre à chemins optiques communs ou quasi-communs. Pour ce type d’interféromètre, la ... [more ▼]

Notre étude porte sur l’utilisation de composants optiques biréfringents en tant qu’élément séparateur dans un interféromètre à chemins optiques communs ou quasi-communs. Pour ce type d’interféromètre, la seule différence introduite dans les chemins optiques des faisceaux objet et de référence est celle résultant du relief de la surface testée. Utiliser un élément biréfringent permet de n’avoir qu’un seul élément pour créer les faisceaux référence et objet. On parle d’auto-référencement. Cette propriété désensibilise l’interféromètre vis-à-vis de certaines perturbations extérieures car les faisceaux sont identiquement affectés par celles-ci. La biréfringence des cristaux étant bien souvent faible mais l’interféromètre à construire devant être le plus compact possible, le cisaillement entre les deux faisceaux s’en retrouve faible comparé à la taille de l’objet observé. Une séparation totale des faisceaux émergents n’est possible qu’avec un faisceau « ponctuel » collimaté. La configuration des interféromètres que nous étudierons sera donc différentielle. Deux types d’éléments biréfringents sont étudiés. Le premier est un assemblage de deux cristaux uniaxes taillés à 45° et dont l’orientation de l’axe de l’un des cristaux est tournée à 90° par rapport à celle de l’autre. Il s’agit de la lame de Savart. Les propriétés de cette lame sont détaillées pour justifier l’intérêt de son utilisation dans l’interféromètre. Ce dernier a été utilisé en shearographie et en profilométrie par projection de franges interférométriques. Une installation originale permet l’association des deux méthodes dans un unique montage compact. Dans la configuration proposée, seule l’orientation du cisaillement par l’interféromètre est possible. Pour faire varier la taille du cisaillement, nous avons décidé d’évoluer vers un autre type d’élément biréfringent. L’essor des éléments optiques à biréfringence spatialement variable nous a incités à investiguer cette voie. Ces éléments ont la particularité de permettre une variation spatiale de l’orientation de l’axe optique. Les réseaux de polarisation font partie de cette famille. Après avoir décrit et simulé leur comportement, nous proposons notre propre méthode d’enregistrement de tels réseaux par holographie de polarisation à l’aide d’une lame de Savart. Nous prouvons par la suite que deux réseaux de polarisation circulaire de même orientation et disposés l’un à la suite de l’autre créent un élément séparateur à taille et orientation de cisaillement variables pour un interféromètre à chemins optiques quasi-communs. Nous proposons une application en shearographie. [less ▲]

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See detailA Monitoring Campaign for Luhman 16AB. I. Detection of Resolved Near-Infrared Spectroscopic Variability
Burgasser, A. J.; Gillon, Michaël ULg; Faherty, J. K. et al

E-print/Working paper (2014)

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