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See detailTropical insects in collection at the University of Liège Museum of Zoology: a first approach
Loneux, Michèle ULg; Grogna, Philippe; Govers, Aurélie et al

in Segers, Hendrik; Desmet, P.; Baus, Erika (Eds.) Proceedings of the 3rd GBIF Science Symposium - Tropical Biodiversity: Science, Data, Conservation (2006)

The University of Liège Museum of Zoology holds some large and not well-known insect collections, which are still very well preserved, due to the work of famous entomologists and curators such as Fritz ... [more ▼]

The University of Liège Museum of Zoology holds some large and not well-known insect collections, which are still very well preserved, due to the work of famous entomologists and curators such as Fritz Carpentier and Noël Magis. Insects from tropical areas are very well presented in these collections and were collected all around the world. The expedition of Edouard van Beneden in Brazil (in company of two entomologists) provided numerous specimens, mainly Coleoptera. More than 8,500 insects were sent from Paraguay by the Estacion Entomologica ‘FABRE’ and are still preserved in the original mailing boxes. Due to investment of the University in cooperation projects with some African countries, numerous insects (mainly Lepidoptera and Coleoptera) were collected there between 1900 and 1990. The main source of exotic insect specimens is the “Léon Candèze’s collection of Lepidoptera from around the world”, which comprimes more than 9,500 specimens. A first inventory, which digitized all genera and families present in this collection, showed it contains at least five systematic types. However, the aforesaid collections need an in depth study from researchers interested in the genera and species they concern. Even though not every insect specimen is recorded in the handwritten registers or the collection database, the well- organised depositories allow finding them easy, and any request of study would be welcome. [less ▲]

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See detailInhibition of ceramide-redox signaling pathway blocks glomerular injury in hyperhomocysteinemic rats.
Yi, F.; Zhang, A. Y.; Li, N. et al

in Kidney International (2006), 70(1), 88-96

Ceramide-activated NAD(P)H oxidase has been reported to participate in homocysteine (Hcys)-induced abnormal metabolism of the extracellular matrix (ECM) in rat glomerular mesangial cells. However, it ... [more ▼]

Ceramide-activated NAD(P)H oxidase has been reported to participate in homocysteine (Hcys)-induced abnormal metabolism of the extracellular matrix (ECM) in rat glomerular mesangial cells. However, it remains unknown whether this ceramide-redox signaling pathway contributes to glomerular injury induced by hyperhomocysteinemia (hHcys) in vivo. The present study was designed to address this question, defining the role of ceramide and activated NAD(P)H oxidase in the development of hHcys-induced glomerular injury. Uninephrectomized Sprague-Dawley rats were fed a folate-free diet for 8 weeks to produce hHcys and the de novo ceramide synthesis inhibitor myriocin or the NAD(P)H oxidase inhibitor apocynin was administrated. Rats with folate-free diet significantly increased plasma Hcys levels, renal ceramide levels, and NAD(P)H oxidase activity accompanied by marked glomerular injury. Treatment of rats with myriocin significantly reduced ceramide levels and improved glomerular injury, as shown by decreased urinary albumin excretion and reduced glomerular damage index. ECM components changed towards to normal levels with decreased tissue inhibitor of metalloproteinase-1 and increased matrix metalloproteinase-1 activity. NAD(P)H oxidase activity and Rac GTPase activity were reduced by 69 and 66%, respectively. In rats treated with apocynin, similar beneficial effects in protecting glomeruli from hHcys-induced injury were observed. These results support the view that de novo ceramide production is involved in Hcys-induced NAD(P)H oxidase activity in the kidney of hHcys rats and indicate the important role of ceramide-mediated redox signaling in hHcys-induced glomerular injury in rats. [less ▲]

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See detailSeasonal variation of morph ratio in facultatively paedomorphic populations of the palmate newt Triturus helveticus
Denoël, Mathieu ULg

in Acta Oecologica: International Journal of Ecology (2006), 29(2), 165-170

Facultative paedomorphosis is a polyphenism in which individuals may express one of two alternative ontogenetic pathways (metamorphosis vs. paedomorphosis) depending on environmental cues. Previous ... [more ▼]

Facultative paedomorphosis is a polyphenism in which individuals may express one of two alternative ontogenetic pathways (metamorphosis vs. paedomorphosis) depending on environmental cues. Previous laboratory experiments showed that drying can cause morph ratio change, suggesting that the maintenance of facultative paedomorphosis is highly dependent on environmental determinants. The aim of this study was to examine seasonal variation in morph ratios in eight ponds from Larzac (southern France) naturally inhabited by palmate newts and to relate it to pond drying. in some ponds, the relative proportion of paedomorphs (i.e. individuals retaining gills at the adult stage) increased after the breeding period, but it remained stable or decreased in other ponds. This seasonal variation in the abundance of the two morphs most probably reflects (1) the emigration of metamorphs leaving the pond to occupy terrestrial habitats and (2) metamorphosis of paedomorphic adults in response to drying of the ponds. This study shows that facultative paedomorphosis in palmate newts is a dynamic process that allows rapid change (i.e. within a single year) in morph ratio to fit environmental variation (i.e. risk of drying) within the aquatic habitats. Long-term studies are needed to model the evolution of the dimorphism according to environmental change. (c) 2005 Elsevier SAS. All rights reserved. [less ▲]

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See detailA prominent role for amygdaloid complexes in the Variability in Heart Rate (VHR) during Rapid Eye Movement (REM) sleep relative to wakefulness.
Desseilles, Martin ULg; Dang Vu, Thien Thanh ULg; Laureys, Steven ULg et al

in NeuroImage (2006), 32(3), 1008-1015

Rapid eye movement sleep (REMS) is associated with intense neuronal activity, rapid eye movements, muscular atonia and dreaming. Another important feature in REMS is the instability in autonomic ... [more ▼]

Rapid eye movement sleep (REMS) is associated with intense neuronal activity, rapid eye movements, muscular atonia and dreaming. Another important feature in REMS is the instability in autonomic, especially in cardiovascular regulation. The neural mechanisms underpinning the variability in heart rate (VHR) during REMS are not known in detail, especially in humans. During wakefulness, the right insula has frequently been reported as involved in cardiovascular regulation but this might not be the case during REMS. We aimed at characterizing the neural correlates of VHR during REMS as compared to wakefulness and to slow wave sleep (SWS), the other main component of human sleep, in normal young adults, based on the statistical analysis of a set of (H2O)-O-15 positron emission tomography (PET) sleep data acquired during SWS, REMS and wakefulness. The results showed that VHR correlated more tightly during REMS than during wakefulness with the rCBF in the right amygdaloid complex. Moreover, we assessed whether functional relationships between amygdala and any brain area changed depending the state of vigilance. Only the activity within in the insula was found to covary with the amygdala, significantly more tightly during wakefulness than during REMS in relation to the VHR. The functional connectivity between the amygdala and the insular cortex, two brain areas involved in cardiovascular regulation, differs significantly in REMS as compared to wakefulness. This suggests a functional reorganization of central cardiovascular regulation during REMS. (c) 2006 Elsevier Inc. All rights reserved. [less ▲]

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See detailLe nez électronique, un nouvel outil diagnostique pour les maladies respiratoires du cheval ?
Salinas, Emmanuelle; Ramery, Eve ULg; Fraipont, Audrey ULg et al

in Proceedings: AVEF, Versailles, France (2006)

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See detailEarly bifrontal brain injury: sequential neuropsychological developmental features
Bonnier, Christine; Potelle, Dominique; Buelens, M et al

in Revista de neurologia (2006)

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See detailGenetical metabolomics of flavonoid biosynthesis in Populus: a case study.
Morreel, Kris; Goeminne, Geert; Storme, Veronique et al

in Plant Journal (The) (2006), 47(2), 224-37

Genetical metabolomics [metabolite profiling combined with quantitative trait locus (QTL) analysis] has been proposed as a new tool to identify loci that control metabolite abundances. This concept was ... [more ▼]

Genetical metabolomics [metabolite profiling combined with quantitative trait locus (QTL) analysis] has been proposed as a new tool to identify loci that control metabolite abundances. This concept was evaluated in a case study with the model tree Populus. Using HPLC, the peak abundances were analyzed of 15 closely related flavonoids present in apical tissues of two full-sib poplar families, Populus deltoides cv. S9-2 x P. nigra cv. Ghoy and P. deltoides cv. S9-2 x P. trichocarpa cv. V24, and correlation and QTL analysis were used to detect flux control points in flavonoid biosynthesis. Four robust metabolite quantitative trait loci (mQTL), associated with rate-limiting steps in flavonoid biosynthesis, were mapped. Each mQTL was involved in the flux control to one or two flavonoids. Based on the identities of the affected metabolites and the flavonoid pathway structure, a tentative function was assigned to three of these mQTL, and the corresponding candidate genes were mapped. The data indicate that the combination of metabolite profiling with QTL analysis is a valuable tool to identify control points in a complex metabolic pathway of closely related compounds. [less ▲]

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See detailBulletin de la Commission royale pour la publication des Anciennes Lois et Ordonnances de Belgique
Marchandisse, Alain ULg

Book published by Ministère de la Justice (2006)

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See detailImpact of acute cadmium exposure on the trunk lateral line neuromasts and consequences on the "C-start" response behaviour of the sea bass (Dicentrarchus labrax L.; Teleostei, Moronidae).
Faucher, Karine ULg; Fichet, Denis; Miramand, Pierre et al

in Aquatic Toxicology (2006), 76(3-4), 278-94

Behavioural responses of sea bass Dicentrarchus labrax were investigated after exposure to cadmium ions in laboratory-controlled conditions. The aim of this study was to discover whether environmental ... [more ▼]

Behavioural responses of sea bass Dicentrarchus labrax were investigated after exposure to cadmium ions in laboratory-controlled conditions. The aim of this study was to discover whether environmental exposure to cadmium ions inactivates fish lateral line system neuromasts, and to determine the behavioural consequences of such a sensory blockage. For this, fish escape behaviour in response to an artificial water jet was recorded using a 25-frames s(-1) analog video camera before and after cadmium exposure. Experimental set up was tested with fish whose lateral line system was artificially inactivated by antibiotics (gentamicin and streptomycin). Histological analyses with scanning electron microscopy showed antibiotic treatment destroyed lateral line system neuromasts. In addition, these fish did not respond to stimulations provoked by the water jet after antibiotic treatment. Fish escape behaviour was then recorded before and after cadmium exposure at two different concentrations. When fish were exposed to the first concentration of cadmium tested (0.5 microg l(-1), which represents the maximal cadmium concentration encountered in contaminated estuaries), no alteration in neuromast tissue was observed. In addition, before cadmium exposure, fish responded positively in 98.41 +/- 4.95% of lateral line system stimulations (escape behaviour in response to the water jet). After cadmium exposure, no behavioural modification could be detected: the fish responded positively in 95.16 +/- 9.79% of stimulations (chi(2) = 2.464, p = 0.116). In contrast, the high cadmium concentration used (5 microg l(-1), which represents 10 times the concentration occurring in highly polluted estuarine areas) involved severe neuromast tissue damage. Just after such cadmium exposure, fish showed only 41.67 +/- 35.36% of positive responses to their lateral line system stimulations, while they responded positively in 95.93 +/- 9.10% of stimulations under control conditions (chi(2) = 24.562, p < 0.0001). Their lateral line system neuromasts seemed to regenerate about 1 month after cadmium exposure. Associated with this regeneration, from the 21st day after cadmium exposure, their escape behaviour had recovered and was not significantly different from that recorded under control conditions (86.74 +/- 20.82%, chi(2) = 2.876, p = 0.090). This study shows that although 5 microg l(-1) cadmium is able to damage lateral line system neuromasts and causes fish behavioural alterations, fish exposed to 0.5 microg l(-1) cadmium displayed neither tissue neuromast nor behavioural modification. [less ▲]

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See detailRelationship between haptoglobin, serum amyloid A, and clinical status in a survey of dairy herds during a 6-month period
Humblet, Marie-France ULg; Guyot, Hugues ULg; Boudry, Benjamin et al

in Veterinary Clinical Pathology (2006), 35(2), 188-193

Haptoglobin and serum amyloid A are major acute phase proteins in cattle. Dairy cattle often develop pathologic conditions in the peripartum period; acute phase proteins may be useful in their diagnosis ... [more ▼]

Haptoglobin and serum amyloid A are major acute phase proteins in cattle. Dairy cattle often develop pathologic conditions in the peripartum period; acute phase proteins may be useful in their diagnosis. Objectives: The purpose of this study was to compare the accuracy of serum haptoglobin (Hp) and serum amyloid A (SAA) concentrations with clinical health status for diagnosing disease during the peripartum period in dairy cattle. Methods: Dairy cows from 4 herds were evaluated every 15 days over a 6-month period. Health status was determined by thorough clinical examination. Haptoglobin and SAA concentrations were measured in serum using validated methods and the results were classifed as positive or negative based on defined cutoff points. Disease prevalence, sensitivity, and specificity were compared using clinical examination as the gold standard. Results: A total of 1896 samples from 158 cows were analyzed. Significant increases in mean Hp and SAA concentrations were observed in the week following parturition in both primiparous and multiparous cows, although high interindividual variability was observed. Both Hp and SAA had low sensitivity but higher specificity in determining disease status compared with clinical examination. Increased concentrations of Hp and SAAwere found in ,10% of samples from clinically healthy cows, except in the week after parturition. Conclusions: Haptoglobin and serum amyloid A should be used with caution as markers of inflammation in the week after calving. Poor sensitivity in other postpartum periods could be related to the higher incidence of chronic (vs acute) inflammation. Haptoglobin may be appropriate for routine screening, but further work needs to be done to assess its value as an indicator of herd health. [less ▲]

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See detailHistology of two rice bodies isolated from the stifle of an adult draught horse stallion.
Schneider, Nicole ULg; Heimann, Marianne; Lejeune, Jean-Philippe ULg et al

in Journal of Veterinary Science (Suwon-si, Korea) (2006), 7(1), 83-5

In the human and equine species, different kinds of free floating intra-articular particles are related to certain disorders. Osteochondral fragments formed during osteochondrosis dissecans are the most ... [more ▼]

In the human and equine species, different kinds of free floating intra-articular particles are related to certain disorders. Osteochondral fragments formed during osteochondrosis dissecans are the most common finding in the equine species, whereas in humans rice bodies due to rheumatoid arthritis are more frequent. Herein we report a third type of floating body inside the stifle of an adult draught horse stallion, in macroscopic appearance similar to articular rice bodies known in humans. As revealed by histologic examination, the two particles consist of polypoid degenerated structures derived from synovial villi. Their formation was probably induced by ischemia. [less ▲]

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See detailCapital social et résultats sociaux de l'éducation
Baye, Ariane ULg; Mainguet, Christine ULg

in Houard, Jean; Jacquemain, M. (Eds.) Capital social et dynamique régionale (2006)

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See detailImproving control of storage diseases on apple by combining biological and physical postharvest methods
Creemers, P.; Van Laer, S.; Vorstermans, B. et al

Poster (2006)

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See detailPolitiques actives d’emploi et professionnels de l’employabilité : critique et clinique
Orianne, Jean-François ULg

in Travail Emploi Formation (2006), 6/2006

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See detailLes angles corniculaires et l'infiniment petit
Bair, Jacques ULg; Henry, Valérie ULg

in Tangente Sup (2006), 31(mai-juin), 4-7

Nous mettons en évidence le fait que des angles entre un demi-cercle et une droite tangente mène au concept d'infiniment petit.

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See detail« Derrière la violence. Regard sur l’histoire en train de se produire »
Gyemant, Maria ULg

in Studia Universitatis Babes-Bolyai, Philosophia (2006), LI(2), 69-78

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See detailA cascade optimization methodology for automatic parameter identification and shape/process optimization in metal forming simulation
Ponthot, Jean-Philippe ULg; Kleinermann, Jean-Pascal

in Computer Methods in Applied Mechanics & Engineering (2006), 195(41-43), 5472-5508

Computer simulations of metal forming processes using the finite element method (FEM) are, today, well established. This form of simulation uses an increasing number of sophisticated geometrical and ... [more ▼]

Computer simulations of metal forming processes using the finite element method (FEM) are, today, well established. This form of simulation uses an increasing number of sophisticated geometrical and material models, relying on a certain number of input data, which are not always readily available. The aim of inverse problems, which will be considered here, is to determine one or more of the input data relating to these forming process simulations, thereby leading to a desired result. In this paper, we will focus on two categories of such inverse problems. The first category consists of parameter identification inverse problems. These involve evaluating the material parameters for material constitutive models that would lead to the most accurate results with respect to physical experiments, i.e. minimizing the difference between experimental results and FEM simulations. The second category consists of shape/process optimization inverse problems. These involve determining the initial geometry of the specimen and/or the shape of the forming tools, as well as some parameters of the process itself, in order to provide the desired final geometry after the forming process. These two categories of inverse problems can be formulated as optimization problems in a similar way, i.e. by using identical optimization algorithms. In this paper, we intend firstly to solve these two types of optimization problems by using different non-linear gradient based optimization methods and secondly to compare their efficiency and robustness in a variety of numerical applications. (c) 2005 Elsevier B.V. All rights reserved. [less ▲]

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See detailIntroduction à la prise de vue HDV/HDCam
Hamers, Jérémy ULg; Cappelle, Louis-Philippe

Conference given outside the academic context (2006)

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See detailRelative Lamb-Mossbauer factors of tin corrosion products
Sougrati, Moulay Tahar ULg; Jouen, S.; Hannoyer, Béatrice

in Hyperfine Interactions (2006), 167(1-3), 815-818

Variable temperature Sn-119 Mossbauer spectroscopy was used to obtain relative Lamb-Mossbauer factors for three tin corrosion products: hydrated stannic oxide SnO2 center dot xH(2)O, abhurite Sn21O6Cl16 ... [more ▼]

Variable temperature Sn-119 Mossbauer spectroscopy was used to obtain relative Lamb-Mossbauer factors for three tin corrosion products: hydrated stannic oxide SnO2 center dot xH(2)O, abhurite Sn21O6Cl16(OH)(14), and tin hydroxysulfate Sn3OSO4(OH)(2). Their hyperfine parameters have also been investigated. [less ▲]

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See detailLe rôle pivot des variables latentes pourle raisonnement statistique conditionnel. Exemples d'applications environnementales des processus ponctuels marqués.
Parent, E.; Bernier, J.; Boreux, Jean-Jacques ULg

in Revue de Statistique Appliquée (2006), 54(4), 85-111

En statistique bayésienne, le raisonnement conditionnel probabiliste fonde la solidarité étroite entre modélisation et inférence. Dans le cadre de ce raisonnement, un rôle pivot est joué par les variables ... [more ▼]

En statistique bayésienne, le raisonnement conditionnel probabiliste fonde la solidarité étroite entre modélisation et inférence. Dans le cadre de ce raisonnement, un rôle pivot est joué par les variables latentes. Ce mode de raisonnement peut s’avérer utile aussi en statistique fréquentiste. On présente trois séries hydrométéorologiques décrites par des modèles de processus ponctuels marqués de complexité croissante. Sur ces exemples, on montre comment récolter les fruits de la souplesse de modélisation et des facilités de calcul apportées par les variables latentes. Ces variables améliorent la conceptualisation de variables de structure dans les modèles statistiques et permettent aux calculs d’inférence de bénéficier des algorithmes MCMC en relation avec les techniques «d’augmentation de données». [less ▲]

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