References of "Poster"
     in
Bookmark and Share    
Full Text
See detailContribution to the description of the nitrogen cycle in Lake Kivu
Roland, Fleur ULg; Borges, Alberto ULg; Crowe, Sean et al

Poster (2013, November 12)

Detailed reference viewed: 33 (0 ULg)
Full Text
See detailEcology of mosquitoes (Diptera, Culicidae) potentially vectors of arboviruses according to the kinds of animal husbandry in Belgium
Boukraa, Slimane ULg; De la Grandière de Noronha Cotta, Maria Ana ULg; Bawin, Thomas ULg et al

Poster (2013, November 12)

Human activity, commercial exchanges and climate changes current and future, could favor the (re)-emergence of vector-borne diseases, by inducing changes on Culicidae populations. This study aims to ... [more ▼]

Human activity, commercial exchanges and climate changes current and future, could favor the (re)-emergence of vector-borne diseases, by inducing changes on Culicidae populations. This study aims to determine the potential importance of agricultural environments, especially cattle farms and equestrian, to welcome and favor the proliferation of some species of mosquito responsible for transmission of arboviruses. To better understand the structure of the Culicidae population and identify habitats favorable to the development of each species, a taxonomic inventory was conducted in 2008 (III, VI and X) and 2009 (V and IX) in ten cattle farms, and in 2011 (VI-X) and 2012 (VI-IX) in six equestrian farms located in Belgium. The harvest of mosquitoes is based on adult trapping by CO2-traps (Mosquito magnet) and on larval sampling at the level of 64 biotopes such as water troughs, used tires, abandoned utensils and temporary puddles or not. The morphotaxonomic of larvae and genitalia, and molecular study showed the presence of 15 species: Culiseta annulata Schrank, 1776; Cs. morsitans Theobald, 1901 Anopheles claviger s.s. Meigen, 1804; An. maculipennis s.s. Meigen, 1818; An. messeae Falleroni, 1926; An. plumbeus Stephens, 1828; Culex pipiens molestus Forskal, 1775; Cx. pipiens pipiens L., 1758; Cx. torrentium Martini, 1925; Cx. hortensis hortensis Ficalbi, 1889; Cx. territans Walker, 1856; Coquillettidia richiardii Ficalbi, 1889; Ochlerotatus geniculatus Olivier, 1791; Oc. cantans Meigen, 1818 and Aedes cinereus Meigen, 1818. Among the 57,680 individuals examined, Cx. pipiens s.l., Cx. torrentium and Cs. annulata are the dominants species and ubiquitous in all farms visited. The species of the genus Anopheles have strong ecological requirements and are therefore associated with some special habitats; other species however have a strong ability to adapt and therefore attend a wide variety of biotopes (Cx. pipiens s.l., Cx. torrentium and Cs. annulata). Water troughs, used tires and ponds are the most favorable habitats for larval development of Culicidae. The species potentially vectors of arboviruses that can cause problems in epidemiological farms are Cx. pipiens s.l., Cx. torrentium and Cq. richiardii. Therefore, despite the low diversity of mosquito observed within the livestock environments, they represent a significant risk for the reproduction of some potential vectors of arboviruses. In addition, some larval habitats constitute very favorable sites for proliferation of mosquito, causing a real problem of nuisance for animals of farms. [less ▲]

Detailed reference viewed: 47 (21 ULg)
Full Text
See detailTransient middle cerebral artery occlusion prevents habit formation in C57Bl/6J mice
Linden, Jérôme ULg; Plumier, Jean-Christophe ULg; Ferrara, André ULg et al

Poster (2013, November 10)

Pathologies affecting the striatum (e.g., Parkinson’s and Huntington’s disease) can result in impaired habit learning abilities. Likewise, such impairments have also been observed after stroke affecting ... [more ▼]

Pathologies affecting the striatum (e.g., Parkinson’s and Huntington’s disease) can result in impaired habit learning abilities. Likewise, such impairments have also been observed after stroke affecting the middle cerebral artery territory (encompassing the striatum). However, habit learning has never been investigated in animal stroke models, for which it could be a reliable measure of cognitive deficits. We thus assessed the ability to learn a habitual sequence of lever-presses using operant conditioning in mice after MCAO, one of the most common stroke models. C57Bl/6J mice underwent MCAO or sham surgery. Sensorimotor functioning was assessed using the vertical pole test, rotarod and amphetamine-induced rotation test. Habit learning was evaluated using the operant serial order learning (SOL) task: mice had to perform a series of two consecutive lever-presses (i.e., left then right) to obtain a food reward. Lesion extents were finally determined using anti-NeuN immunohistochemistry. MCAO mice were significantly impaired in both the rotarod and vertical pole test, and displayed a significantly greater number of ipsilateral rotations after amphetamine administration. In the operant SOL task, MCAO committed more errors than sham; moreover, they did not show any significant increase in performance along the sessions. Histological analysis showed consistent striatal and cortical infarctions. The lack of habit learning ability in MCAO mice is congruent with both the literature investigating the effect of striatal lesion in animals and the symptomatology observed in human stroke patients. Habit learning could thus be regarded as a reliable measure of functional outcome after MCAO, in combination with test assessing sensory and motor aspects. [less ▲]

Detailed reference viewed: 58 (7 ULg)
See detailEstrogens control female sexual motivation and receptivity in quail.
de Bournonville, Catherine ULg; Ball, Gregory, F.; Balthazart, Jacques ULg et al

Poster (2013, November 10)

Detailed reference viewed: 17 (3 ULg)
Full Text
Peer Reviewed
See detailIncreased affinity of N-Methyl-AG525 stereoisomers for SK2 and SK3 channels
Liégeois, Jean-François ULg; Seutin, Vincent ULg; Dilly, Sébastien ULg

Poster (2013, November 09)

Small conductance calcium-activated potassium (SK, KCa2) channels represent interesting and challenging targets in medicinal chemistry. So far, the reference ligand is apamin, a peptide used in most ... [more ▼]

Small conductance calcium-activated potassium (SK, KCa2) channels represent interesting and challenging targets in medicinal chemistry. So far, the reference ligand is apamin, a peptide used in most published studies including the [125I] analog for binding studies. Nonpeptidic ligands with high affinity have been developed for several years. Currently, different questions remain to be solved. No selective and brain-penetrating agent is available. In addition, replacing [125I]apamin in binding experiments would be also interesting. We have developed different series of compounds initially derived from laudanosine (1). The quaternized derivative, N-methyl-laudanosine (NML), was found to be a weak SK blocker but highly reversible in electrophysiological experiments (2). Then, bis-charged derivatives were synthesized. Potentially brain-penetrating AG525 stereoisomers were obtained and tested for their affinity for SK channels (3). The affinity of one enantiomer, AG525E1, was found to be close to that of dequalinium (Ki ~ 200 nM) while the two other stereoisomers had a lower affinity. Following this study, quaternization of AG525 stereoisomers was carried out and the affinity of these compounds for SK channel subtypes was determined in comparison with that of parent compounds. We observed a significant increase of affinity for SK2 and SK3 channels for the bis-charged N-methyl derivatives as compared to the basic AG525 stereoisomers to. The ratio of selectivity was increased a little in the case of bis-charged N-methyl derivatives. In addition, the influence of stereochemistry was quite different between both groups. For basic AG525 stereoisomers, the S,S-enantiomer (AG525E1) was the most potent while, within bis-charged N-methyl analogues, both enantiomers had higher affinity. Further in silico approaches should permit to explain these results. References: (1) Graulich et al., Bioorg. Med. Chem. 2005, 13, 1201 (2) Scuvée-Moreau et al., J. Pharmacol. Exp. Ther. 2002, 302, 1176 (3) Graulich et al., Bioorg. Med. Chem. Lett., 2008, 18, 3440 [less ▲]

Detailed reference viewed: 24 (1 ULg)
Full Text
Peer Reviewed
See detailEculizumab (ECU) Inhibits Thrombotic Microangiopathy (TMA) and Improves Renal Function in Adult Atypical Hemolytic Uremic Syndrome (aHUS) Patients (Pts)
Fakhouri, Fadi; Hourmant, Maryvonne; Campistol, Josep et al

Poster (2013, November 08)

Detailed reference viewed: 16 (0 ULg)
Full Text
Peer Reviewed
See detailPINP in renal impaired patients: the assay matters
CAVALIER, Etienne ULg; DELANAYE, Pierre ULg

Poster (2013, November 08)

Detailed reference viewed: 37 (4 ULg)
Full Text
Peer Reviewed
See detailAu-delà des interdits. Religion islamique et pratiques culinaires marocaines en Italie.
Mescoli, Elsa ULg

Poster (2013, November 07)

In many discourses about the relationship between food and Islamic religion, attention is often devoted to normative aspects: Muslims food practices are ruled by the polarization between what is halal and ... [more ▼]

In many discourses about the relationship between food and Islamic religion, attention is often devoted to normative aspects: Muslims food practices are ruled by the polarization between what is halal and what is haram to eat. In this discursive context, even if negotiations with certain requirements can be taken into account, believers would primarily incorporate a food style determined by certain feed bans. My study, without neglecting these aspects, aims at demonstrating how the semantic field of the term halal not only includes all that is not forbidden for consumption by religious norms. This field opens indeed to many instructions, coming from Islamic sources, actively and positively guiding believers in their food choices. My doctoral research, focusing on culinary practices and objects of Moroccan women in migration context, made me reconsider the Islamic religion as having an affirmative role in eating behaviours and even in food preparation. The women protagonists of my ethnography show how the choice to use certain ingredients and to prepare some meals is dictated or supported by divine guidance. My presentation will focus on the materiality of these dynamics: through images collected during my ethnography, my intention is to recount the complexity and the concreteness of the relationship between eating habits and Islam. [less ▲]

Detailed reference viewed: 30 (1 ULg)
Full Text
See detailUsing GAit Measuring System (GAIMS) to discriminate patients with multiple sclerosis from healthy person
Azrour, Samir ULg; Pierard, Sébastien ULg; Van Droogenbroeck, Marc ULg

Poster (2013, November 07)

Among voluntary movements, gait is the most affected by multiple sclerosis. Gait impairment is also a good indicator of the disease progression. However, measurement of gait character- istics made by ... [more ▼]

Among voluntary movements, gait is the most affected by multiple sclerosis. Gait impairment is also a good indicator of the disease progression. However, measurement of gait character- istics made by neurologists is usually limited to the use of a stopwatch. The GAit Measuring System (GAIMS), provides a wider range of measurements that allow the definition of several relevant gait descriptors. The work presented here shows the effectiveness of these gait descriptors and machine learning techniques to discriminate between healthy persons and patients with multiple sclerosis. [less ▲]

Detailed reference viewed: 80 (32 ULg)
Full Text
Peer Reviewed
See detailLe genre Guibourtia Benn: un modèle biologique idéal pour comprendre les mécanismes de spéciation
Tosso, Dji-ndé Félicien ULg; Daïnou, Kasso ULg; Hardy, Olivier et al

Poster (2013, November 06)

Les forêts denses tropicales humides se distinguent par leur grande diversité biologique qui leur confère un caractère complexe. Dans un tel contexte, comprendre le passé et l'histoire évolutive de la ... [more ▼]

Les forêts denses tropicales humides se distinguent par leur grande diversité biologique qui leur confère un caractère complexe. Dans un tel contexte, comprendre le passé et l'histoire évolutive de la dynamique de ces forêts, constitue un moyen efficace pour prédire leur dynamique future. De telles études qui traitent de la biologie évolutive (phylogénie et phylogéographie) sont rares en Afrique comparativement aux autres continents. Le présent travail ambitionne de contribuer, sur base d’un modèle biologique comportant plusieurs espèces sœurs, à la compréhension des mécanismes à l'origine de la diversité des écosystèmes forestiers tropicaux. Le modèle biologique choisi est le genre Guibourtia Benn daté de moins de 20.000 ans qui regroupe 13 espèces ligneuses africaines de grande importance socio-culturelle et économique. Ce modèle rassemble non seulement des espèces de formations végétales différentes (forêt et savane) mais aussi des espèces inféodées aux régions établies sur des sols variés (sableux, argilo-limoneux, calcaire, hydromorphe etc.). Spécifiquement, l’étude vise à (i) démêler les relations phylogénétiques au sein du genre Guibourtia sur la base de caractérisations physiologique et morphogénétique; (ii) inférer l'histoire évolutive au sein du genre Guibourtia grâce aux récents outils d'analyse phylogéographique et de datation moléculaire ; et (iii) examiner les possibilités de flux de gènes entre deux espèces morphologiquement semblables à savoir G. tessmannii (Harms) J. Léonard et G. pellegriniana J. Léonard à l’échelle du Gabon. Ce travail se distingue par son originalité du fait qu’il développe une approche qui combine la physiologie et la génétique. Les résultats contribueront à modéliser la distribution des différentes unités évolutives du genre Guibourtia avec un modèle dynamique de végétation (CARAIB) afin de conclure sur leur statut de conservation et déduire les stratégies de gestion durable appropriées. [less ▲]

Detailed reference viewed: 84 (22 ULg)
Full Text
See detailCommunautés floristiques et paramètres édaphiques : comment se répartissent les forêts claires dans la plaine de Lubumbashi ?
Hick, Aurélie ULg; Hoffait, Nicolas; Kizila Wimana, Pacifique et al

Poster (2013, November 06)

Au sud de la République Démocratique du Congo, dans la province du Katanga, le redéveloppement des activités minières a entrainé un développement démographique exponentiel des principales villes minières ... [more ▼]

Au sud de la République Démocratique du Congo, dans la province du Katanga, le redéveloppement des activités minières a entrainé un développement démographique exponentiel des principales villes minières. La population de Lubumbashi, capitale du Katanga, est passée en 50 ans d’environ 100 000 habitants à plus d’1 million et demi (Munyemba Kankumbi, 2010). Cette évolution démographique a accentué la pression sur la forêt claire de type Miombo par l’augmentation des prélèvements, la pression immobilière et l’agriculture de subsistance (Malaisse, 1997). Dans la zone périurbaine de Lubumbashi, les surfaces de forêts claires qui occupaient 85 % du territoire en 1956 ont été réduites à moins de 12 % en 2009 (Munyemba Kankumbi, 2010). Afin de comprendre l’écosystème à restaurer, nous procédons à la caractérisation des communautés de Miombo dans la plaine de Lubumbashi en fonction des conditions édaphiques. Pour ce faire, 116 placettes forestières de 18m de rayon ont été placées aléatoirement dans les derniers massifs forestiers présents dans un rayon de 50km au nord de la ville. L’ensemble des arbres adultes de diamètre supérieur à 2cm de d.b.h ont été inventoriés. De plus, un second cercle de 5 mètres de rayon a été placé au centre de chaque placette de 18m afin de répertorier l’ensemble de la régénération forestière (< à 2cm de d.b.h). Un sondage descriptif de sol à la tarière a été réalisé dans chaque placette et un échantillon de sol composite a été prélevé pour les analyses chimiques de sol (C, N, pH KCl, K, Ca, Na, Mg, Mn). Les données floristiques ont subies une transformation de corde afin de pouvoir les traiter dans une analyse en composante principale (ACP). Une classification k-means a été réalisée sur les scores de l’ACP afin d’obtenir des groupes de communauté floristique. Chaque groupe a été caractérisé par leurs espèces indicatrices et dominantes. Ces analyses ont été menées sur le peuplement adulte et sur la régénération. Une analyse canonique des correspondances a permis de mettre en évidence le lien entre ces communautés et les paramètres édaphiques. Le miombo de la plaine de Lubumbashi est caractérisé par 6 communautés floristiques : une communauté à Uapaca nitida et Uapaca pilosa, une communauté à Brachystegia boehmii, une communauté à Marquesia macroura, une communauté à Julbernardia globiflora, une communauté à Uapaka kirkiana et pour finir une communauté à Diplorhynchus condylocarpon, Pseudolactnostylis maprouenifolia et Julbernardia paniculata. L’analyse nous révèle que ces communautés sont contraintes par les données édaphiques. Les communautés se différencient d’une part par la profondeur du sol, la charge caillouteuse, le carbone, l’azote et le potassium et d’autre part par le magnésium, le manganèse et le sodium. Dans une optique de restauration, il est donc essentiel de tenir compte du type de sol en place et de la communauté à restaurer. [less ▲]

Detailed reference viewed: 32 (0 ULg)
Peer Reviewed
See detailLate Quaternay sedimentation and active faulting in the Western tip of the Gulf of Corinth, Greece
Hubert, Aurelia ULg; Beckers, Arnaud ULg; Beck, Christian et al

Poster (2013, November 06)

The Gulf of Corinth is one of the fastest-spreading intracontinental rifts on Earth. Present day kinematics (GPS data) indicates an opening direction oriented NNE-SSW and an opening rate increasing ... [more ▼]

The Gulf of Corinth is one of the fastest-spreading intracontinental rifts on Earth. Present day kinematics (GPS data) indicates an opening direction oriented NNE-SSW and an opening rate increasing westward from 11 mm y-1 in the central part to 16 mm y-1 in the westernmost part. A significant part of the deformation is localized offshore, where the fault geometry was not well known yet. The high extension rate would imply a high seismic hazard if faults are not creeping. We propose an accurate map of submarine faults in the western extremity of the Gulf of Corinth. The map is based on two high-resolution seismic reflection surveys (single channel sparker) performed aboard HCMR’s R/V ALKYON, within the frame of SISCOR ANR Project. About 600 km of seismic lines were acquired, with a 200 msTWTT maximum penetration down to what we infer to represent the MIS 5 discontinuity. Depocenters location is controlled by river deltas where up to 75m of post-LGM sediments are stored. Numerous, up to 15m thick, mass transport deposits fill the central and eastern parts. In the eastern part, the sedimentary infill is faulted by the known North Eratini, South Eratini and West Channel faults. At the longitude of the Trizonia Island, the seafloor in mainly horizontal and the only fault is the south dipping Trizonia fault. Between the Trizonia Island and the Mornos Delta, the shallower northern part of the gulf shows a diffuse pattern of deformation with faults striking mainly E-W and ESE-WNW. It shows south and north dipping normal faults, strike-slip faults, as well as an inherited basement relief. To the West, three young grabens have been identified, striking NE-SW and W-E. The northern, 6 km long, fault in this grabens system shows a clear strike-slip component (fig.1). [less ▲]

Detailed reference viewed: 29 (2 ULg)
Full Text
See detailDe la paléoécologie à l'écologie actuelle : 2000 ans d'interaction homme-milieu dans le nord du Bassin du Congo
Morin-Rivat, Julie ULg; Bentaleb, Ilham; Biwole, Achille ULg et al

Poster (2013, November 06)

La forêt tropicale africaine a longtemps été considérée comme vierge du passage de l’homme. Cependant, plusieurs études récentes en paléoécologie et archéologie ont démontré la présence d’activités ... [more ▼]

La forêt tropicale africaine a longtemps été considérée comme vierge du passage de l’homme. Cependant, plusieurs études récentes en paléoécologie et archéologie ont démontré la présence d’activités humaines anciennes à partir d’indices paléoenvironnementaux (i.e. pollens de plantes anthropophiles) et d’artefacts (i.e. tessons de céramique). Ces études sont toutefois trop rares en raison de difficultés de terrain pour repérer et accéder aux sites archéologiques (couvert végétale dense, absence de pistes). De grandes zones à l’intérieur des terres demeurent donc inexplorées. Par ailleurs, peu d’études se sont penchées sur la question de l’impact de ces activités anthropiques passées sur la structure et la composition de la végétation actuelle. Grâce à une approche multidisciplinaire à la frontière entre sciences humaines et sciences de l’environnement (archéologie, pédoanthracologie : charbons de bois des sols, écologie forestière), notre objectif est d’identifier des indices d’activités humaines anciennes, lesquels sont été mis en relation avec les patrons actuels de végétation. Nos trois zones d’étude sont localisées en forêt tropicale humide de type guinéo-congolais et sont réparties dans le sud-ouest et sud-est du Cameroun et le nord de la République du Congo. Le long d’une vingtaine de transects de plusieurs kilomètres, nous avons appliqué un protocole systématique de récolte de matériel archéologique et archéobotanique dans des fosses situées sur des parcelles d’inventaire botanique. Ceci nous a permis de récolter plus d’un millier d’échantillons contenant des macrorestes végétaux carbonisés ainsi que des artefacts inédits pour la région (pierre taillée et polie, tessons de céramique, scories de métallurgie) et d’inventorier la végétation dans l’environnement immédiat des découvertes. L’analyse spatiale et temporelle (chronologie relative et par datation radiocarbone) des macrorestes a permis d’identifier des villages entourés de probables champs agricoles (agriculture itinérante sur brûlis). Les 68 datations radiocarbones et les types céramiques obtenus suivent une chronologie archéologique en deux phases : un âge du Fer ancien entre 2300 et 1300 BP et un âge du Fer récent se poursuivant jusqu’à la période subactuelle, entre 670 et 20 BP. Entre ces deux phases d’occupation, les traces d’activités anthropiques sont rares. La première phase d’activités serait à mettre en relation avec une fragmentation de la forêt dense à la suite d’un épisode climatique aride autour de 2500 BP, permettant ainsi aux populations de pénétrer la forêt. Un épisode plus humide à partir de 800 BP, avec un retour d’un couvert plus dense, aurait fait reculer les populations humaines. Leur rétablissement dans les forêts se serait produit conjointement à des conditions plus sèches. Ces trois phases rejoignent la chronologie générale établie à l’échelle de l’Afrique centrale. Les premiers taxons identifiés parmi les macrorestes végétaux carbonisés, graines et charbons de bois, démontrent l’utilisation ancienne du palmier à huile et d’arbres fruitiers sauvages. Les espèces ligneuses identifiées sont présentes dans le cortège floristique actuel. L’identification taxonomique des charbons de bois devrait nous permettre de reconstituer l’environnement végétal au cours des deux derniers millénaires. Les différences observées dans les couverts forestiers passé et actuel en termes de composition floristique ainsi que la structure des peuplements actuels sont de bons indicateurs d’impacts récents de l’homme sur son milieu. [less ▲]

Detailed reference viewed: 150 (34 ULg)
Full Text
See detailImpacts of past Human disturbances on present-day tree species assembly in a tropical forest of South-East Cameroon
Vleminckx, Jason; Doucet, Jean-Louis ULg; Daïnou, Kasso ULg et al

Poster (2013, November 06)

Many evidence have been found for intensive past Human presence in the forests of Central Africa, notably widespread charcoal occurrence in the soil. Forest clearing for slash-and-burn agriculture may ... [more ▼]

Many evidence have been found for intensive past Human presence in the forests of Central Africa, notably widespread charcoal occurrence in the soil. Forest clearing for slash-and-burn agriculture may have favored the competitiveness of light-demanding species (LD) to the detriment of shade-bearer species (SB). Hypothesis: Positive correlation between abundance of charcoal in the soil (proxy for past Human clearing) and abundance of LD.Mostly “young” charcoals were thought to reflect past Human disturbances that would have shaped present-day species assembly. However, CAI 0-20cm and CAI 20-100cm were highly correlated with each other (r-Pearson = 0.55; P<0.001) and both displayed positive correlations with Non-Pioneer LD abundance (significant with a classic test) and negative correlations with SB abundance. Although this observation is coherent with our hypothesis, significance disappeared when correcting for spatial autocorrelation [4], even after removing small-diameter trees potentially too young to be linked with last Human disturbances (not shown). Correlation of CAI between the two soil layers => Humans found appropriate conditions for settlement in the same area at different periods? Absence of significant correlation in ❸ (i) Last Human disturbances are too old to detect any signal on present-day tree species assembly. (ii) Human impact is weak compared to other factors (soil properties, dispersal limitation,…) (iii) Local scale heterogeneity of LD abundance is weak compared to landscape scale. Parallel large scale gradients in the abundance of Non-Pioneer LD and charcoal abundance (proxy for past slash-and-burn activities) were observed, but a causal link cannot be established so far. [less ▲]

Detailed reference viewed: 57 (18 ULg)
Full Text
Peer Reviewed
See detailDistribution de 8 espèces végétales endémiques du Katanga (R.D.Congo) le long d'un gradient de cuivre et de cobalt
Boisson, Sylvain ULg; Lebrun, Julie ULg; Mahy, Grégory ULg

Poster (2013, November 06)

Au sud de la province du Katanga (R.D.Congo), se développe une végétation unique sur des sols recouvrant une centaine d’affleurements de cuivre et de cobalt parmi les plus importants au monde (Arc ... [more ▼]

Au sud de la province du Katanga (R.D.Congo), se développe une végétation unique sur des sols recouvrant une centaine d’affleurements de cuivre et de cobalt parmi les plus importants au monde (Arc cuprifère katangais). Le paysage de cette région est composé de collines isolées les unes des autres et présentant des communautés végétales distinctes selon la concentration en éléments traces métalliques du sol. Les savanes steppiques se retrouvent sur des sols faiblement contaminés tandis que les pelouses sont inféodées aux sols pouvant être contaminés à des teneurs avoisinant les 10 000 mg.kg-1 de cuivre et 1000 mg.kg-1 de cobalt. Plus de 600 espèces d’angiospermes métallophytes y sont retrouvées dont 32 vivant exclusivement sur des sols contaminés (endémiques strictes). Ces espèces présentent des adaptations physiologiques et biologiques leur permettant de tolérer les concentrations exceptionnelles dans le sol. Certaines d’entre-elles ont d’ailleurs été identifiées comme des hyperaccumulatrices de cuivre et/ou de cobalt. Le caractère unique de la plupart des espèces endémiques de cette flore est aujourd’hui menacé par les activités minières intenses dans la province. Ces espèces représentent pourtant des ressources génétiques de grands intérêts pour développer des stratégies de restauration et de remédiation des sites pollués par leur rôle potentiel en phytostabilisation des sols. L’objectif de l’étude est de caractériser la niche écologique réalisée de 8 espèces endémiques le long du gradient de cuivre et cobalt en vue d’adapter les stratégies de conservation et de restauration des espèces. Les espèces étudiées sont Triumfetta likasiensis, Lopholaena deltombei, Tinnea coerulea var. obovata, Sopubia neptunii, Basananthe kisimbae, Barleria lobelioides, Commelina zigzag, Euphorbia cupricola. Pour chaque espèce, 3 sites ont été prospectés en faisant un transect de 2 m de large le long des gradients métalliques et en identifiant tous les individus de l’espèce. Ensuite, 5 individus ont été sélectionnés parmi le nombre total d’individus comptés : 2 extrêmes, 1er quartile, 1 médian, 3ème quartile. Pour chacun d’eux, un quadrat d’un mètre carré y a été centré au sol et le nombre d’individus de l’espèce dénombrés. Un échantillon de sol composite a ensuite été prélevé entre 0 et 15 cm de profondeur afin de déterminer les teneurs en cuivre et cobalt par une spectrométrie d’absorption atomique dans la flamme à partir de l’extrait NH4-Acétate-EDTA du sol. Les niches écologiques réalisées ont été modélisées pour chaque métal par la méthode d’estimation des noyaux avec le logiciel R 3.0.1 (package ‘vioplot’). Les résultats montrent que les niches écologiques de ces espèces endémiques se répartissent entre 50 et 11 000 mg.kg-1 de sol pour le cuivre et 4 et 1500 mg.kg-1 de sol pour le cobalt. Six espèces se situent dans des concentrations inférieures à 100 mg.kg-1 le long du gradient de cobalt. Le long du gradient de cuivre, deux espèces ont des optima écologiques supérieurs à 3000 mg.kg-1. La niche écologique de B. kisimbae est la plus étroite avec un optimum environnant les 200 mg Cu.kg-1 et 50 mg Co.kg-1. L’espèce S. neptunii est présente sur l’entièreté du gradient de cobalt et est retrouvée dans les concentrations élevées. La variation des niches écologiques le long des gradients métalliques indique que les stratégies de conservation doivent être adaptées selon les espèces à conserver. Dans cette étude, 4 des 8 espèces pourraient être conservées sur un sol contaminé à 500 mg Cu.kg-1 et 30 mg Co.kg-1. Pour les autres, il est indispensable de mettre en place les stratégies de conservation en considérant, dans un premier temps, les espèces au cas par cas. [less ▲]

Detailed reference viewed: 35 (7 ULg)
Peer Reviewed
See detailINFLUENCE OF THE NATURE OF SUGAR RESIDUES ON THE INTERACTIONS OF SYMETRIC SUGAR- BASED BOLAFORMS WITH MODEL MEMBRANES
Nasir, Mehmet Nail ULg; Crowet, Jean-Marc ULg; Lins, Laurence ULg et al

Poster (2013, November)

Glycolipid surfactants constitute a class of natural compound having interest in biological field such as antifungal, antiviral and plant-elicitor and for pharmaceutical formulation as well as for food ... [more ▼]

Glycolipid surfactants constitute a class of natural compound having interest in biological field such as antifungal, antiviral and plant-elicitor and for pharmaceutical formulation as well as for food and cosmetic field. Their action may be modulated through their interactions with plasma membranes of target cells and more particularly by their interactions with membrane lipid molecules. Among glycolipid surfactants, bolaforms constitute an important class; they are composed of two hydrophilic heads connected by a hydrophobic carbon segment.Their interest lies mainly in the development of the efficient and low cost lipid-based drug delivery systems. In this context, our work was focused on two sugar-based bolaforms. They are composed by two identical hydrophilic head constituted by xylose ( BolaX) or rhamnose ( BolaR), connected by an ether link to a hydrocarbon segment with an insaturation. The interactions of  BolaX and BolaR with model phopsholipid and phospholipid/sterol model membranes (Langmuir monolayers at the air-water interface and multilamellar vesicles) were investigated with biophysical and in silico approaches. Our results indicate that both bolaforms interact with model membranes at the level of hydrocarbon chain and, at the phosphate and the carbonyl group of phospholipids. The presence of sterol in the system has an influence on insertion of bolaforms and change slightly the nature of the interactions. The insertion of BolaR within a phospholipid bilayer was deeper than that of  BolaX and its interactions with phospholipids were energetically more favorable, suggesting an important role of the nature of sugar residue. [less ▲]

Detailed reference viewed: 47 (17 ULg)
Full Text
See detailSuccessive Droplets Encapsulation Revealed by Optofluidics
Lismont, Marjorie ULg; Robert, Damien; Vandewalle, Nicolas ULg et al

Poster (2013, November)

Digital microfluidics: an easy way to encapsulate successively water droplets by oil. Digital microfluidics is implemented to coat successively water droplets with a thin layer of silicon oil. Small water ... [more ▼]

Digital microfluidics: an easy way to encapsulate successively water droplets by oil. Digital microfluidics is implemented to coat successively water droplets with a thin layer of silicon oil. Small water droplets are settled at three fibers nodes while a larger oil drop slides down the vertical fiber. Optofluidics: an interesting way to reveal the droplet sliding motion and the encapsulation. To distinguish the different fluids, quantum dots (QDs) and rhodamine labelled polystyrene beads are diluted in oil and water, respectively.These two fluorescent probes are lighted by a 532 nm radiation.The fluorescence signal is recorded by a high speed camera, perpendicularly to the laser and to the fibers network. This set-up reveals that the oil drop passes through the water droplets without removing them from the nodes, leaving a thin oil layer around the water droplets. The coating, clearly seen on top pictures of Fig 2, prevents water evaporation. The key parameters for a good encapsulation are the fiber diameter and the oil viscosity that determine droplets size and velocity, respectively. [less ▲]

Detailed reference viewed: 19 (2 ULg)
Full Text
See detailEncapsulation of water droplets on fibers
Weyer, Floriane ULg; Dreesen, Laurent ULg; Vandewalle, Nicolas ULg

Poster (2013, November)

Detailed reference viewed: 33 (7 ULg)
Full Text
See detailComparaison des performances de cinq tests rapides pour le diagnostic de l’angine à streptocoque du groupe A
DE BACKER, Benjamin ULg; GAVAGE, Pierre; MINON, Jean-Marc

Poster (2013, November)

Objet. Etude comparative des performances analytiques de tests immunochromatographiques pour la détection du streptocoque A dans les frottis de gorge : Quickvue (Quidel), bioNexia (bioMérieux), Clearview ... [more ▼]

Objet. Etude comparative des performances analytiques de tests immunochromatographiques pour la détection du streptocoque A dans les frottis de gorge : Quickvue (Quidel), bioNexia (bioMérieux), Clearview (Inverness medical), Dipromed et All-Diag. Méthodes. Les prélèvements utilisés ont été réalisés avec les E-Swab de chez Copan. Un total de 106 échantillons a été testé, dont 58 positifs et 48 négatifs. Environ la moitié des échantillons a été testée avec le format cassette et l’autre moitié avec le format dipstick pour les kits bioNexia et Clearview. Par ailleurs, les kits Dipromed et All-Diag (tous deux au format dipstick) ont été groupés dans cette étude car ils sont identiques (information confirmée par les fournisseurs). Les résultats des tests rapides ont été comparés à ceux de la culture prolongée. Les échantillons ont été ensemencés sur milieu CNA, avec disque de bacitracine pour l’identification présomptive du streptocoque A. Un groupage à l’aide de tests d’agglutination (Oxoid) et/ou une identification de la souche sur l’automate Vitek 2 (bioMérieux) ont été réalisés pour identification formelle. Sur base des résultats de l’étude, nous avons calculé la sensibilité et la spécificité de chaque kit. Ces valeurs ont ensuite été appliquées à la prévalence de cultures positives pour le streptocoque A observée au CHR Citadelle, en 2012. Nous avons ainsi pu calculer les valeurs prédictives positives (VPP) et négatives (VPN) sur notre population réelle. Résultats. La sensibilité est excellente pour tous les kits, comprise entre 93,1% (Clearview) et 96,6% (Quickvue). La spécificité est de 95,8% pour le Quickvue, tandis qu’elle est de 97,9% pour tous les autres kits. Sur la population du CHR Citadelle (2012), les VPP sont de 77,6% pour le Quickvue, et se situent aux alentours de 87% pour les autres kits. Les VPN sont excellentes et vont de 99 à 99,5%. Conclusion. Les valeurs de sensibilité et spécificité obtenues dans cette étude sont conformes à celles attendues pour ce genre de kit selon la littérature, c’est-à-dire respectivement supérieures à 90% et 95%. Les VPP observées avec le test Quickvue sont péjorées par l’existence d’un faux positif de plus. Les autres kits présentent une quasi-équivalence analytique dans notre série. [less ▲]

Detailed reference viewed: 34 (1 ULg)
Full Text
Peer Reviewed
See detailEnvironmental Product Declaration of purified and defluorinated phosphoric acid – difficulties and limitations of the methodology
Belboom, Sandra ULg; Scözs, Carl; Léonard, Angélique ULg

Poster (2013, November)

The awareness of environment and the development of environmental product declarations (EPDs) are increasing through years. EPD becomes a need for producers in both B to B and B to C relations. EPD ... [more ▼]

The awareness of environment and the development of environmental product declarations (EPDs) are increasing through years. EPD becomes a need for producers in both B to B and B to C relations. EPD elaboration process is not without difficulties. Such a declaration requires a considerable amount of time and information, a full comprehension of the applied methodology but it also causes confidentiality problems. All these difficulties can lead to the use of simpler tools, as Carbon Footprint, which only focuses on a single impact and misses a part of the message. This case study is based on the production of phosphoric acid in Belgium using PCR for inorganic chemicals. It takes into account the use of raw materials as phosphate rocks or chemicals, their transportation to site and the manufacturing of defluorinated and purified phosphoric acid. This process also requires steam, electricity, demineralised water and sulphuric acid. These inputs are produced on site and their modelling is taken into account in this study. The first step of this process is the production of weak phosphoric acid with transformation of phosphate rocks into 30% phosphoric acid using sulphuric acid attack. The particularity of this process is the production, in this company, of a recoverable coproduct, called gypsum. The amount of this product is about 1.6 t per t of weak acid. A stoichiometric relation connects both products and is used as allocation factor, as recommended by the PCR. Through next concentration steps, fluosilicic acid is produced, also linked to the production of phosphoric acid by a stoichiometric relation. For facilities production plant, repartition of impact between coproducts is not so easy. As mentioned before, the production of steam, electricity, demineralised water and sulphuric acid are performed on site. Sulphuric acid is produced by the combustion of liquid sulphur provided by oil refineries. Two different units produce both sulphuric acid and steam through the combustion of liquid sulphur but only one of them transforms a part of steam into electricity. Repartition of impact between sulphuric acid and steam can be achieved using a physical relation based on thermodynamic values which can be transformed into mass relation. For repartition between electricity, steam and sulphuric acid, the main difficulty is that electricity does not have a weight and a transformation into steam shall be achieved to use the same relationship that previously. This way of allocating is not very obvious for producers, even if it is the one recommended by the PCR. As electricity and steam are coproduced, an energetic allocation is also relevant and gives completely opposite results for repartition of impact of each product. In that case, sulphuric acid impact achieves a non-negligible part of the impact which modifies greatly results of phosphoric acid production. This is a problem when you know that environmental product declarations are used to compare products on environmental criteria, using mainly values of climate change or energy impacts. Producers are then reticent to publish such a value which can lead to a loss of customer confidence, even more when they occupy a leading position on the market and taking into account that a comparison with other producers is quite impossible. More specific guidelines should be set to indicate the best way to perform an environmental product declaration in specific fields using a specific way of allocation. [less ▲]

Detailed reference viewed: 68 (1 ULg)
Full Text
Peer Reviewed
See detailDoes Belgian bioethanol comply with European Renewable Energy Directive ?
Belboom, Sandra ULg; Bodson, Bernard ULg; Léonard, Angélique ULg

Poster (2013, November)

The craze for biofuels has increased in recent years mainly to reduce greenhouse gas emissions and fossil fuel consumptions. The European Renewable Energy Directive (RED), published in 2009, defined ... [more ▼]

The craze for biofuels has increased in recent years mainly to reduce greenhouse gas emissions and fossil fuel consumptions. The European Renewable Energy Directive (RED), published in 2009, defined guidelines to assess carbon footprint of a biofuel depending on biomass source. It also provided generic values of GHG emissions relative to each step of the life cycle taking into account all steps from the cultivation to the end-of-life. These values are used to evaluate the sustainability of European biofuels depending on the used crops and the used transformation technology. This study, based on local crops cultivated in Belgium (sugar beet and wheat), compares specific Belgian values with European generic ones. Belgium yields for both crops are among the best of the continent. Specific Belgian values for fertilizers and pesticides are used. The transformation of wheat into bioethanol is modelled using industrial data. As recommended by the RED, no land use change is taken into account for Belgium. Greenhouse gas emissions induce by the life cycle of Belgium sugar beet bioethanol are similar to the ones mentioned in the European directive but impact repartition is different. In our case, the transformation step achieves a higher part of the impact. That can be explained by the higher cultivation yield. Belgian wheat bioethanol obtains better results than those mentioned by the European directive with a 9% higher reduction. Cultivation step is the major step for this impact. Importance of fertilizers consumptions and associated emissions are highlighted. The comparison of both bioethanols impacts for climate change category, using an energy basis, shows that wheat allows a higher reduction of GHG emissions than sugar beet. If the comparison is performed on a cultivated area basis, results are reversed and sugar beet achieves a twofold reduction compared with wheat. Sensitivity analyses are performed on the importance of N fertilizers and associated emissions and on energy consumptions relative to the transformation step. These analyses reveal non-negligible impact variations. A range of GHG reduction that can be reached using Belgian sugar beet and wheat bioethanol are then calculated. In any case, sugar beet does not achieve the amount of reduction given by the RED, while the opposite effect is shown for wheat with a reduction at least as high as the RED default value. These results indicate the importance of make use of specific values to assess the sustainability of bioethanol for a specific country using a specific crop and a specific technology. Further measurements and research about emission factors due to fertilizers application could improve the accuracy of our results. [less ▲]

Detailed reference viewed: 38 (5 ULg)
Peer Reviewed
See detailLandslide hazard in the North Tanganyika - kivu rift zones: current knowledge and research perspective
Dewitte, Olivier; Albino, F; Delvaux, D et al

Poster (2013, November)

The North tanganyika – Kivu rift zones are areas naturally prone to landsliding where triggering and environmental factors that favour the occurrence of mass movement concentrate. In many places landslide ... [more ▼]

The North tanganyika – Kivu rift zones are areas naturally prone to landsliding where triggering and environmental factors that favour the occurrence of mass movement concentrate. In many places landslide hazard is very high, and anthropogenic factors such as land use change and urban expansion increase the sensibility to slope instability. From seismic to rainfall-induced mass movements we review the current knowledge of the various slope precesses and associated hazards that are present in these equatorial environments. A particular attention is given to urban areas such as Bukavu and Bujumbura where lanslide threat is particularly acute. Research perspectives on landslide inventorying, monitoring, and susceptibility and hazard assesment are presented. [less ▲]

Detailed reference viewed: 29 (2 ULg)
Full Text
See detailVariation radiale de l’angle des microfibrilles de cellulose et de la longueur des trachéides chez le Douglas
Vaïanopoulos, Céline; Henin, Jean-Marc; Hebert, Jacques ULg et al

Poster (2013, November)

La sylviculture du douglas (Pseudotsuga menziesii) en Wallonie est récente et présente des modalités opératoires très contrastées. Aussi, pour guider l’action des sylviculteurs, une étude technologique ... [more ▼]

La sylviculture du douglas (Pseudotsuga menziesii) en Wallonie est récente et présente des modalités opératoires très contrastées. Aussi, pour guider l’action des sylviculteurs, une étude technologique visant à évaluer l’impact du dynamisme de la sylviculture sur les propriétés du bois de douglas a été initiée. Il est accepté aujourd’hui que l’angle des microfibrilles de cellulose (AMF) de la paroi des trachéides, ainsi que la longueur des trachéides, peuvent expliquer largement le comportement du bois sans défaut. Dans un premier temps, l’étude a porté sur les variations de l’AMF et de la longueur des trachéides au sein des arbres en fonction de paramètres tels que leur vitesse de croissance, l’âge du cerne, la position radiale ou la hauteur dans l’arbre. Ultérieurement, ces résultats seront utilisés pour tenter d’expliquer les propriétés mécaniques du bois sur la base de ses caractéristiques anatomiques. Il sera alors possible de relier les caractéristiques de croissance avec les propriétés du bois produit afin de proposer les pratiques sylvicoles les plus pertinentes. [less ▲]

Detailed reference viewed: 29 (3 ULg)
Full Text
See detailLes concessions forestières peuvent-elles contribuer à la conservation du gorille des plaines de l'Ouest? Exemple d'une concession au Sud-Est du Gabon
Haurez, Barbara ULg; Petre, Charles-Albert ULg; Doucet, Jean-Louis ULg

Poster (2013, November)

Vingt pourcents des forêts du Bassin du Congo sont actuellement principalement affectées à la production de produits ligneux et non-ligneux [FAO-OIBT, 2011]. L'exploitation est un agent de perturbation de ... [more ▼]

Vingt pourcents des forêts du Bassin du Congo sont actuellement principalement affectées à la production de produits ligneux et non-ligneux [FAO-OIBT, 2011]. L'exploitation est un agent de perturbation de ces forêts [WILKIE ET AL., 2000]. Au vu de l’importance économique des industries d’extraction pour les pays de cette région, l’étendue des forêts exploitées pour leur bois ne devrait pas diminuer dans les années à venir, au contraire. La survie de nombreuses espèces animales de forêt dense humide dépend donc de leur capacité à survivre en milieu exploité [JOHNS, 1985]. A ce jour, les concessions forestières jouent potentiellement un rôle crucial pour la protection des différentes espèces de grands singes. En effet, plus de 50% de l'aire de distribution des grands singes d’Afrique de l'Ouest est localisée dans les concessions forestières [MORGAN & SANZ, 2007]. Or, la faune sauvage joue un rôle essentiel pour la durabilité de l'exploitation forestière car elle assure la dissémination des graines [WRIGHT, 2003], dont celles des espèces commerciales. En particulier, le gorille des plaines de l'Ouest (Gorilla gorilla gorilla Savage & Wyman, 1847), espèce en danger critique d'extinction (IUCN), semble jouer un rôle fondamental dans la dispersion des diaspores des espèces ligneuses [ROGERS ET AL., 1998 ; VOYSEY ET AL., 1999]. Cette étude vise à déterminer les interactions entre les gorilles des plaines de l'Ouest et l'exploitation forestière, afin d'évaluer dans quelle mesure ces deux acteurs peuvent être bénéfiques l'un envers l'autre. Plus particulièrement, la densité en gorilles a été estimée dans une zone exploitée 25 ans plus tôt. Le comportement nidificateur des gorilles dans cette zone a été décrit. D'autre part, le rôle potentiel joué par les gorilles dans la dynamique de régénération des forêts exploitées est abordé au travers de l'étude de la dispersion des graines (identification des graines dispersées, contrôle du pouvoir germinatif et détermination de l'impact du passage dans le tractus digestif sur la germination). La densité en gorilles observée au sein du site d'étude est relativement élevée (1,5 gorille/km²). Les gorilles établissent leurs sites de nidification préférentiellement au sein de forêts de terre ferme à canopée ouverte. Ils utilisent fréquemment les anciennes routes d'exploitation, densément couverte de végétation herbacée, pour l'alimentation et la nidification. Au bout de 10 mois de suivi, 45 espèces végétales ont été identifiées comme étant dispersées par les gorilles. Le potentiel germinatif a été évalué pour 36 taxons. Les taux de germination observés dépendent de l'espèce considérée, et varient de 0 à 100%. L'impact du tractus digestif sur la germination a actuellement été testé pour deux espèces, Santiria trimera (Burseraceae) et Chrysophyllum lacourtianum (Sapotaceae). Pour ces deux espèces, les graines passées dans le tractus digestif des gorilles présentent des taux de germination significativement plus élevé que les graines extraites de fruits frais (entourées de pulpe ou non). Les résultats préliminaires de cette étude suggèrent que les forêts exploitées peuvent supporter des densités en gorilles comparables à celles des aires protégées. En outre, via son rôle en tant que disperseur, le gorille pourrait avoir un rôle crucial dans la régénération des forêts post-exploitation. L'exploitation forestière et la conservation des gorilles des plaines de l'Ouest paraissent donc compatibles. [less ▲]

Detailed reference viewed: 62 (22 ULg)
Full Text
See detailSnu Spaces, from Theory to Practice
Kleyntssens, Thomas ULg; Nicolay, Samuel ULg

Poster (2013, October 29)

Computing the spectrum of singularities of a real-life signal by using the definition is impossible. One rather uses an indirect way to compute it: the multifractal formalism. The first multifractal ... [more ▼]

Computing the spectrum of singularities of a real-life signal by using the definition is impossible. One rather uses an indirect way to compute it: the multifractal formalism. The first multifractal formalism was introduced by Frisch and Parisi in the context of fully developped turbulence (1985). Its main default is that it always leads to a concave spectrum. For this reason, Stéphane Jaffard has introduced the Snu spaces (2004). They lead to a new multifractal formalism which can detect non concave spectra. In practice, one has to avoid the concept of limit and to deal with finite size effects. I present a method to determine the spectrum based on the Snu spaces and I illustrate it numerically on theoretical functions. [less ▲]

Detailed reference viewed: 20 (9 ULg)
Full Text
See detailOn generalized Hölder-Zygmund spaces
Kreit, Damien ULg; Nicolay, Samuel ULg

Poster (2013, October 29)

The Hölder spaces provide a natural way for measuring the smoothness of a function. These spaces appear in different areas such as approximation theory and multifractal analysis. The purpose of this ... [more ▼]

The Hölder spaces provide a natural way for measuring the smoothness of a function. These spaces appear in different areas such as approximation theory and multifractal analysis. The purpose of this poster is to present a generalization of such spaces as well as some recent results about their characterizations. These spaces are a particular case of a generalization of Besov Spaces who have recently been extensively studied. [less ▲]

Detailed reference viewed: 37 (6 ULg)
Full Text
See detailGenome-wide environmental interaction analysis using multidimensional data reduction principles to identify asthma pharmacogenetic loci in relation to corticosteroid therapy
Van Lishout, François ULg; Bessonov, Kyrylo ULg; Duan, Quingling et al

Poster (2013, October 25)

Genome-wide gene-environment (GxE) and gene-gene (GxG) interaction studies share a lot of challenges via the common genetic component they involve. GWEI studies may therefore benefit from the abundance of ... [more ▼]

Genome-wide gene-environment (GxE) and gene-gene (GxG) interaction studies share a lot of challenges via the common genetic component they involve. GWEI studies may therefore benefit from the abundance of methodologies that are available in the context of genome-wide epistasis detection methods. One of these is Model-Based Multifactor Dimensionality Reduction (MB-MDR), which does not make any assumption about the genetic inheritance model. MB-MDR involves reducing a high-dimensional GxE space to GxE factor levels that either exhibit high or low or no evidence for their association to disease outcome. In contrast to logistic regression and random forests, MB-MDR can be used to detect GxE interactions in the absence of any main effects or when sample sizes are too small to be able to model all main and GxE interaction effects. In this ongoing study, we demonstrate the opportunities and challenges of MB-MDR for genome-wide GxE interaction analysis and analyzed the difference in prebronchodilator FEV1 following 8 weeks of inhaled corticosteroid therapy, for 565 pediatric Caucasian CAMP (ages 5-12) from the SHARE project. [less ▲]

Detailed reference viewed: 41 (10 ULg)
Peer Reviewed
See detailA case of hemolytic anemia after severe malaria successfully treated with artesunate
ROUYA, Laura ULg; LEONARD, Philippe ULg; Hayette, Marie-Pierre ULg

Poster (2013, October 24)

Intravenous artesunate is the treatment of choice for severe and complicated malaria according to the WHO 2010 guidelines. Seventeencases of delayed hemolysis after parenteral treatment with artesunate ... [more ▼]

Intravenous artesunate is the treatment of choice for severe and complicated malaria according to the WHO 2010 guidelines. Seventeencases of delayed hemolysis after parenteral treatment with artesunate have been recently reported in European travellers with imported Plasmodium falciparummalaria1. We report the case of a 40-years-old Belgian man who contracted severe falciparum malaria after a four-weeks stay in Central and Eastern Africa without taking any antimalarial chemoprophylaxis. He presented on admission with fever, headache, jaundice andabdominal syndrome.Thereafter hisbiological and clinical conditionrapidly worsened withconsciousness disorders, severe thrombocytopenia,acute hepatitis and pancreatitis, and renal failure. Parasitemia reached a peak of 37 % on the second day of admission. Since this patient fulfilled WHO 2010 criteria for severe malaria,intravenous artesunatetreatment dosed at 2,4 mg/kg was started. Parasite clearancewas obtained after 48 hours and the patient’s clinical status improved significantly.Five doses of intravenous artesunate were administered, followed by oral artemeter/lumefantrine treatment during 60 hours. Tendays after the first dose of artesunate the patient developed a severe hemolyticanemia(hemoglobin4,9 g/dL) associated with impaired renal function. Thick blood film was negative. Blood transfusion and high doses of corticosteroids were successfully administrated and hemodialysis was not necessary. Until now, no clear explanation has been given to this complication. This case highlights the usefulness of extended follow-up including haematological parametersforpatients treated with artesunate, at least one monthafter the malaria episode. 1Published reports of delayed hemolyticanemia after treatment with artesunate for severe malaria--worldwide, 2010-2012. Centers for Disease Control and Prevention (CDC). [less ▲]

Detailed reference viewed: 60 (4 ULg)
Full Text
See detailAssessing local Ca2+ concentrations in calcium phosphate scaffolds by computational modelling
Manhas, Varun ULg; Guyot, Yann ULg; Chai, Yoke Chin et al

Poster (2013, October 24)

Detailed reference viewed: 19 (3 ULg)
Full Text
Peer Reviewed
See detailT-26. Exploring Root Uptake Under High Frequency Irrigation Using Electrical Resistivity Tomography
Garré, Sarah ULg; Furman, Alex; Assouline, Shmuel et al

Poster (2013, October 22)

Root uptake and its relation to environmental factors, and primarily soil water content, are perhaps the least understood component in terrestrial water balance and is of high importance for water ... [more ▼]

Root uptake and its relation to environmental factors, and primarily soil water content, are perhaps the least understood component in terrestrial water balance and is of high importance for water resources management, ecology and agriculture. In this research we explore the spatial and temporal distribution of soil water in high resolution using electrical resistivity tomography (ERT). Bell peppers were planted in a chamber and irrigated in two different schemes, differing only in irrigation frequency (daily and eight-daily irrigation, where the daily dose is equal for both treatments). This irrigation difference results in very different spatio-temporal distribution of the soil water in the root zone, which in turn derives spatio-temporal differences in root uptake. Experiment was conducted under a screen-house in Mediterranean summer conditions, i.e. very high evapotranspiration. Resistivity surveys, using 96 electrodes placed around the growth chamber and at soil surface (Figure 1) were taken over 10 times daily. Plants subjected to high frequency irrigation generally were faster in growth and matured about a week earlier. This is primarily attributed to the higher water content that exists in the root zone, and primarily during the climatically stressing noon hours. Inverted images (e.g. Figure 2) provide an interesting insight into the spatio-temporal distribution of the root uptake. This in turn can now be correlated to the spatial location of the roots, and to the soil induced water content dynamics. [less ▲]

Detailed reference viewed: 19 (2 ULg)
Full Text
Peer Reviewed
See detailFully Automated Production of 68Ga-DOTA-NOC with a Trasis miniAIO® Synthesizer
Léonard, Marc ULg; Aerts, Joël ULg; Voccia, Samuel et al

Poster (2013, October 22)

Detailed reference viewed: 71 (14 ULg)
Peer Reviewed
See detailFemoral-facial syndrome: long term follow-up and associated array CGH abnormalities.
JACQUINET, Adeline ULg; VALDES SOCIN, Hernan Gonzalo ULg; LIBIOULLE, Cécile ULg et al

Poster (2013, October 22)

The femoral-facial syndrome is usually sporadic and its aetiology remains unknown. Non-genetic factors as maternal diabetes mellitus have been associated. Reports of familial cases have otherwise ... [more ▼]

The femoral-facial syndrome is usually sporadic and its aetiology remains unknown. Non-genetic factors as maternal diabetes mellitus have been associated. Reports of familial cases have otherwise suggested autosomal dominant inheritance. We report the 20 years clinical follow-up of a girl with femoral-facial syndrome diagnosed at birth. Recently, array CGH investigation identified a 1400 kb duplication at 9q31.1, including the gene SMC2, and a 343 kb deletion at 12q24.33 including the genes CHFR, ZNF26, ZNF140, ZNF10 and ZNF268. Moreover, the patient presents a Mayer-Rokitansky-Kuster-Hauser syndrome diagnosed at puberty. Femoral-facial syndrome and Mullerian agenesis may reflect different defects in the primary axial mesodermal development, being the consequences of same environmental or/and genetic factors during blastogenesis. Among these genetic factors, we suggest the possible involvement of the two copy number variants reported here [less ▲]

Detailed reference viewed: 63 (7 ULg)
Full Text
See detailIdentification of asthma-related trans-acting epistatic eQTLs using Model-Based Multifactor Dimensionality Reduction (MB-MDR)
Bessonov, Kyrylo ULg

Poster (2013, October 22)

Epistasis is likely to underlie most complex traits, including gene expression, yet it is very difficult to detect using standard approaches. SNPs located inside a gene coding region or in its vicinity (i ... [more ▼]

Epistasis is likely to underlie most complex traits, including gene expression, yet it is very difficult to detect using standard approaches. SNPs located inside a gene coding region or in its vicinity (i.e. ≤2 Mb from each 5’ and 3’ side) can influence the corresponding gene expression levels. These expression quantitative trait loci (eQTLs) are referred to as cisSNPs. In contrast, eQTLs that are outside the aforementioned gene range can also influence the gene’s expression, in which case, they are called transSNPS to that gene. In this study we considered significant cisSNPs previously identified via generalized least squares (GLS) regression modeling. We then identified those genes transcripts whose expression is regulated by cis/transSNP interaction. In this work we aimed at identifying transcripts whose expression is regulated by a cis/transSNP interactions using Model-Based Multifactor Dimensionality Reduction (MB-MDR) [2]. This model-free approach to detect trans-epistasis involves reducing a high-dimensional GxG space to GxG factor levels that either exhibit high evidence, low evidence or no evidence at all for their association to gene expression levels of interest. Our protocol was applied on real-life data from the childhood asthma management program (CAMP) [1]. It involved coupling a traditional a priori eQTL search to an a posteriori trans-epistasis analysis to identify genetic modifiers to statistically significant cisSNPs. Such an approach allows to reveal previously unreported inter-dependencies that may be important in understanding of biological mechanisms underlying human complex diseases such as asthma. The proposed protocol identified a large number trans-epistasis gene-gene effects of eQTLs. [less ▲]

Detailed reference viewed: 22 (9 ULg)
Full Text
See detailLes Ressources Sauvages des Bois de Tapia (Uapaca bojeri) à Madagascar
Barsics, Fanny ULg; Malaisse, François ULg; Razafimanantsoa, Tsiresy et al

Poster (2013, October 19)

Detailed reference viewed: 23 (4 ULg)
Full Text
See detailLe taupin : un ravageur souterrain préoccupant
Barsics, Fanny ULg; Haubruge, Eric ULg; Verheggen, François ULg

Poster (2013, October 19)

Detailed reference viewed: 30 (1 ULg)
Full Text
See detailProjet Termitofuel: les termites et leurs symbiontes pour mieux valoriser la biomasse ligno-cellulosique
Bauwens, Julien ULg; Tarayre, Cédric ULg; Brasseur, Catherine ULg et al

Poster (2013, October 19)

L’exploitation actuelle de la biomasse ligno-cellulosique, extrêmement abondante sur Terre, est liée à la production de déchets relativement peu valorisables. C’est pourquoi le projet TERMITOFUEL étudie ... [more ▼]

L’exploitation actuelle de la biomasse ligno-cellulosique, extrêmement abondante sur Terre, est liée à la production de déchets relativement peu valorisables. C’est pourquoi le projet TERMITOFUEL étudie la digestion du bois chez les termites, grâce à une approche pluridisciplinaire, en vue d’améliorer la production de bioéthanol de seconde génération. Au sein de l’Unité d’Entomologie Fonctionnelle et Evolutive, l’approche protéomique est employée afin d’identifier les micro-organismes présents dans le tube digestif des termites et caractériser les activités enzymatiques. [less ▲]

Detailed reference viewed: 8 (1 ULg)
Full Text
See detailMoustiques (Diptera : Culicidae) de la région du M’Zab-Ghardaïa, Algérie : biodiversité et importance médico-vétérinaire
Boukraa, Slimane ULg; Baba Aissa, Nadir; Abdelaziz, Brahim et al

Poster (2013, October 19)

De nombreuses espèces de moustiques sont susceptibles de jouer un rôle dans la transmission de divers agents pathogènes responsables des maladies infectieuses humaines et animales. D'autres, outre leur ... [more ▼]

De nombreuses espèces de moustiques sont susceptibles de jouer un rôle dans la transmission de divers agents pathogènes responsables des maladies infectieuses humaines et animales. D'autres, outre leur rôle vecteur, sont un véritable fléau par les piqûres douloureuses qu’ils occasionnent et, constituent de ce fait un grand problème de nuisance. L'identification précise et la connaissance de la biodiversité fonctionnelle des vecteurs est un pas essentiel pour la compréhension du risque de (ré)-émergence et la dynamiques des maladies vectorielles. Le présent travail est une étude rétrospective des inventaires des Culicidae réalisés sur le terrain dans la région du M’Zab (Ghardaïa, Algérie) durant les années allant de 2008 à 2012. Les résultats de l’étude morphotaxonomique des Culicidae inventoriés ont montré la présence de dix espèces réparties en cinq genres (Culex, Culiseta, Ochlerotatus, Anopheles et Uranotaenia). Un aperçu sur le rôle vectoriel des espèces signalées dans la région et leur importance au niveau de la santé médicale et vétérinaire sont présentés à partir des données bibliographiques. Les espèces potentiellement vectrices d’arbovirus (Virus de Nile occidentale et Virus de la Vallée du Rift) et de protozoaires (Plasmodium spp) qui peuvent causer des problèmes épidémiologique au niveau de la région du M’Zab sont Cx. pipiens sl L., 1758, Cx. theileri Theobald, 1903, Ochlerotatus caspius Pallas, 1771, Anopheles sergentii Theobald, 1907, An. dthali Patton, 1905 et An. multicolor Cambouliu, 1902. [less ▲]

Detailed reference viewed: 70 (6 ULg)
Full Text
See detailCharacterisation of sand transport in gravel-bed rivers using iron slag dated by historical studies
Houbrechts, Geoffrey ULg; Levecq, Yannick ULg; Petit, François ULg

Poster (2013, October 15)

De grandes quantités de scories sidérurgiques sont présentes dans les sédiments des rivières ardennaises. Ces éléments proviennent de centaines d’établissements établis le long des cours d’eau entre le ... [more ▼]

De grandes quantités de scories sidérurgiques sont présentes dans les sédiments des rivières ardennaises. Ces éléments proviennent de centaines d’établissements établis le long des cours d’eau entre le 14ème et le 19ème siècle. Lors de l’exploitation, ces déchets étaient rejetés à proximité des sites sidérurgiques, voire directement déversés dans les cours d’eau. Cela signifie que depuis plusieurs siècles, de grandes quantités de scories de taille variée, se sont mélangées aux alluvions naturelles. Leur couleur et leur éclat les différencient aisément des éléments naturels. Les lieux et périodes d’exploitations sont connus précisément grâce à de nombreuses sources historiques, ce qui rend les scories particulièrement utiles comme marqueurs du déplacement des sédiments dans les cours d’eau (Houbrechts et al., 2011). Dans plusieurs rivières du massif ardennais, des échantillons de sédiments sableux ont été prélevés en aval d’anciens sites métallurgiques. La concentration en scories a été mesurée dans la fraction des sables grossiers (1680 – 2360 µm). La dispersion longitudinale des scories permet d’estimer la vitesse d’avancée des alluvions sableuses. Les sables grossiers constituent une part importante des sédiments transportés dans le fond du lit des cours d’eau. En effet, le suivi d’un piège à sédiment dans un cours d’eau ardennais (la Chavanne) à montré qu’ils représentent plus de 90 % de la charge solide transportée sur le fond des rivières. La présence de scories dans le lit des cours d’eau permet également d’estimer l’épaisseur de la couche active de charriage durant les derniers siècles. [less ▲]

Detailed reference viewed: 38 (15 ULg)
Full Text
See detailFlux des sédiments en suspension dans les rivières du bassin de la Meuse : proposition d'une typologie régionale basée sur la dénudation spécifique des bassins versants
Van Campenhout, Jean ULg; Hallot, Eric ULg; Houbrechts, Geoffrey ULg et al

Poster (2013, October 15)

L'érosion des sols peut être appréhendée à l'échelle du bassin versant en quantifiant le transport sédimentaire en suspension à son exutoire. Environ 2.000 mesures de concentration des matières en ... [more ▼]

L'érosion des sols peut être appréhendée à l'échelle du bassin versant en quantifiant le transport sédimentaire en suspension à son exutoire. Environ 2.000 mesures de concentration des matières en suspension ont permis d'estimer les débits solides annuels en fonction des débits liquides observés dans ces cours d'eau. Une méthodologie simple a été mise en place et appliquée à un réseau de 80 stations, à l’exutoire de bassins versants d’une superficie comprise entre 16 et 2.900 km² situées en région wallonne. Des différenciations régionales ont pu être mises en évidence en fonction du substrat et de l'occupation du sol des bassins versants. La granulométrie des particules transportées et la proportion de matière organique complètent l'analyse et confirment les différenciations observées selon les régions agro-géographiques. L’impact de la fréquence d’échantillonnage (et de sa synchronisation avec les débits de crue) sur l’estimation de la dénudation annuelle a été mis en évidence, ainsi que la grande variabilité interannuelle, qui est fonction de l’intensité et de la hauteur des précipitations. L’érosion des sols est ainsi très sensible aux événements extrêmes. Par ailleurs, l’intérêt de longues campagnes de mesures est souligné. Des données issues de travaux antérieurs ont également été intégrées à la base de données. Son interprétation a permis de définir les meilleurs sites susceptibles d’accueillir à long terme un réseau de mesure en continu de la concentration des matières en suspension en Wallonie. [less ▲]

Detailed reference viewed: 36 (15 ULg)
Full Text
See detailCaractérisation de la couche active et du débit solide dans les rivières à charge caillouteuse du massif ardennais
Levecq, Yannick ULg; Houbrechts, Geoffrey ULg; Van Campenhout, Jean ULg et al

Poster (2013, October 15)

Plusieurs techniques existent pour calculer l’épaisseur de la couche active de charriage et le débit solide des rivières. Il peut s’agir de chaînes d’érosion, de pièges à sédiments, d’échantillonneurs de ... [more ▼]

Plusieurs techniques existent pour calculer l’épaisseur de la couche active de charriage et le débit solide des rivières. Il peut s’agir de chaînes d’érosion, de pièges à sédiments, d’échantillonneurs de charge de fond de type Helley-smith, de galets marqués, ou encore du dépouillement d’archives de curages (Houbrechts et al., 2012). Ces techniques permettent également de déterminer l’impact de travaux d’aménagements ou de restauration de cours d’eau. Dans le cadre de conventions de recherches financées par la DCENN, deux techniques complémentaires ont été utilisées afin d’analyser le transport de charge de fond de rivières de Wallonie. Tout d’abord des chaînes d’érosion ont été implantées en travers du fond du lit, elles permettent de calculer l’épaisseur et la section de la couche de sédiments mobilisés lors des crues. Les puissances spécifiques des crues analysées varient entre 15 et 195 W/m² et ont généré une épaisseur de couche active comprise entre 9 et 80 mm. Ensuite, la distance parcourue par la charge de fond durant des crues mobilisatrices a été estimée à l’aide de galets marqués par des transpondeurs passifs (PIT-tags). Selon l’importance des crues, les distances moyennes de transport observées sont comprises entre 4 et 297 m. En croisant les données obtenues à l’aide de ces deux techniques, le débit solide de charge de fond a également pu être estimé. A titre d’exemple, le débit solide des rivières varie entre 0,02 t.km-2/crue et 2 t.km-2/crue, lorsque la rupture de la couche d’armurage se produit. [less ▲]

Detailed reference viewed: 46 (14 ULg)
Full Text
See detailUtilisation des drones comme outil de suivi de travaux de restauration : génération de séries temporelles d'orthomosaïques à très haute résolution et de modèles numériques de surface
Michez, Adrien ULg; Lisein, Jonathan ULg; Geerts, Cédric ULg et al

Poster (2013, October 15)

D'une invention initialement militaire, les drones - et les applications qui dérivent de leurs utilisation - tendent à se banaliser au sein du domaine civil. En terme d'applications géographiques, les ... [more ▼]

D'une invention initialement militaire, les drones - et les applications qui dérivent de leurs utilisation - tendent à se banaliser au sein du domaine civil. En terme d'applications géographiques, les micro-drones (< 2 kg) occupent un segment nouveau dans les techniques d’acquisition d'informations, à mi-chemin entre deux segments plus classiques, représentés par les techniques d'acquisitions « terrain » (LiDAR terrestre, lever topographique, cartographie GPS, ..) et l'imagerie aérienne (caméra métrique, LiDAR aérien, imagerie satellitale). A l'aide d'un micro-drone X100 (Gatewing-Trimble), l'Unité GRFMN a effectué différents survols du projet de restauration du ruisseau du Morby, entrepris dans le cadre du projet Life+ Walphy. Les survols ont permis la réalisation d'orthomosaïques et de MNS (à l'aide d'Agisoft Photoscan) aux différentes étapes du chantier. Une évaluation de la qualité des MNS photogrammétriques générés est réalisée sur base de données LiDAR aérien disponible sur la zone. Une comparaison des coûts sera également réalisée entre les différentes techniques d'acquisition de données topographiques déployées sur le site lors du projet : MNS photogrammétriques UAV et caméra large format, LiDAR aérien. [less ▲]

Detailed reference viewed: 112 (39 ULg)
Full Text
See detailMOLECULAR CHARACTERIZATION OF CLOSTRIDIUM DIFFICILE STRAINS FROM ELDERLY CARE HOME RESIDENTS
Rodriguez Diaz, Cristina ULg

Poster (2013, October 11)

Clostridium difficile is the primary cause of nosocomial diarrhoea and pseudomembranous colitis after use of antibiotics. Production of toxins A and B are the main virulence factors responsible for its ... [more ▼]

Clostridium difficile is the primary cause of nosocomial diarrhoea and pseudomembranous colitis after use of antibiotics. Production of toxins A and B are the main virulence factors responsible for its pathogenicity. Increasing age, several co-morbidities, environmental contamination, antibiotic exposure and other intestinal perturbations appear to be the greatest risk factors for C. difficile infection (CDI). Therefore, elderly care home residents are considered particularly vulnerable to CDI. The aim of this study was to evaluate and follow the prevalence of C. difficile in a Belgian nursing home and to characterize the C. difficile strains isolated from faeces of elderly care home residents. [less ▲]

Detailed reference viewed: 25 (6 ULg)
Full Text
See detailLongitudinal quality of life assessment in cancer trials: should data be treated as continuous or ordinal?
Donneau, Anne-Françoise ULg; Mauer, Murielle; Coens, Corneel et al

Poster (2013, October 11)

Detailed reference viewed: 25 (3 ULg)
Full Text
Peer Reviewed
See detailEvaluation morphométrique des chevaux pur-sang Arabe en Algérie: mensurations corporelles et proposition d’équations barymétriques
Tennah, Safia ULg; Kafidi, Nacereddine; Antoine-Moussiaux, Nicolas ULg et al

Poster (2013, October 11)

Cette étude vise à la caractérisation morphobiométrique des chevaux de course pur-sang arabe et à l’estimation d’équations barymétriques adaptées à cette race. La caractérisation a concerné 98 chevaux ... [more ▼]

Cette étude vise à la caractérisation morphobiométrique des chevaux de course pur-sang arabe et à l’estimation d’équations barymétriques adaptées à cette race. La caractérisation a concerné 98 chevaux, dont 44 femelles et 54 mâles, tous âgés de trois ans et plus, auprès de 77 propriétaires-éleveurs dans 3 hippodromes d’Algérie (Zemmouri, Tiaret et Caroubier). Dix-neuf mensurations étaient relevées ainsi que le poids vif (PV). Le poids moyen est de 456,2 +/- 43,0 kg, variant de 335 kg à 545 kg. La sélection des variables à inclure dans les équations barymétriques a été réalisée à l’aide de la procédure stepwise du SAS. Quatre mensurations parmi les 19 réalisées ont été retenues pour la proposition d’équations d’estimation du poids vif des chevaux : le périmètre thoracique (PT), la hauteur à la croupe (HC), la longueur de l’encolure (LE) et le tour de l’encolure (TE). Ainsi, les équations proposées pour les mâles et pour les femelles sont respectivement de : PV= 7,024*PT - 787,119 (R²=0,99); PV=6,207*PT + 0,633*HC + 0,668*TE - 0,878*LE - 746,370 (R²=0,96). Les résultats de cette étude devraient permettre aux propriétaires-éleveurs et entraineurs de suivre aisément le poids de leurs chevaux. Ce suivi est nécessaire pour adapter l’activité et l’alimentation des chevaux et favoriser leur performance en course. [less ▲]

Detailed reference viewed: 83 (8 ULg)
Peer Reviewed
See detailPedigree analysis in the Arabian horse in Algeria: estimation of inbreeding coefficient
Tennah, Safia ULg; Kafidi, Nacereddine; Antoine-Moussiaux, Nicolas ULg et al

Poster (2013, October 11)

The studbook of the Arabian horse used in this study is recognized by international authorities such as the WAHO (World Arabian Horse Organization). The pedigree file of the horses includes 1812 animals ... [more ▼]

The studbook of the Arabian horse used in this study is recognized by international authorities such as the WAHO (World Arabian Horse Organization). The pedigree file of the horses includes 1812 animals from 166 stallions (with an average of 10.11 ± 17.33 offspring) and 392 mares (with an average of 4.30 ± 3.76 offspring). The maximal pedigree depth was 18 generations. Inbreeding coefficients of horses present in our data were estimated using the software "Pedigree Viewer" and MTDFREML software on the basis of the provided pedigree. The estimation of the inbreeding coefficient for the 1812 horses showed that 1177 animals from all those present in the pedigree were consanguineous, with an inbreeding coefficients varying from 0,00002 to 0,265, with an overall mean of 0,0275 ± 0,001. The average value of the inbreeding coefficient in the population of Arabian horses in Algeria is thus relatively high. It is to be noticed that this average coefficient of inbreeding is less than the threshold established as problematic in the inbreeding literature (6%); however, 13.5% of the total population shows inbreeding coefficients above this threshold. It is therefore important to educate owners-breeders to the problems that consanguinity can generate, and to avoid as much as possible practices that increase inbreeding, such as a too intensive use of a major ancestor, the use of a too small number of breeding animals and the use of crosses between related individuals. All these measures are necessary to prevent rapid inbreeding increase, which would result in a significant loss of genetic diversity, with a medium-term potentially negative effect on racing performances and reproduction. [less ▲]

Detailed reference viewed: 35 (1 ULg)
Peer Reviewed
See detailEnvironment factors affecting racing performances of Thoroughbred horses in Algeria
Tennah, Safia ULg; Kafidi, Nacereddine; Antoine-Moussiaux, Nicolas ULg et al

Poster (2013, October 11)

The results of the flat races organized in Algeria from 1995 to 2007 by the Algerian Horse Racing Society were used to estimate non-genetic parameters of racing performances of Thoroughbred horses ... [more ▼]

The results of the flat races organized in Algeria from 1995 to 2007 by the Algerian Horse Racing Society were used to estimate non-genetic parameters of racing performances of Thoroughbred horses. Performances were assessed through two earnings traits (the logarithm of annual virtual earnings: LAEV and the logarithm of average annual virtual earnings per start: LAEV/S) and a normalized ranking (PERF). The phenotypic correlations between these traits were calculated, in order to deduce what is common and what is specific to each measure. The environment factors that were investigated are age (3 to 8 years and older), sex (male or female), year of race (1995 to 2007) and the interactions between these factors. The General Linear Model (GLM) procedure from SAS software was used to identify and quantify the non-genetic factors affecting racing performances. The results showed significantly high positive correlations (p<0.001) between the three traits, hence considered as accounting for similar aptitudes. The effects of age (with a plateau between 4 and 5 years) and year (with an increasing trend for more recent years) turned out to be significant (p<0.001) for the three traits, the sex effect was only significant for the PERF trait (with better performances for males than females) and an interaction between the age and year of the performance was the only significant interaction (p<0.05) for the LAEV trait. The significant effects of these non-genetic factors indicate the need to adjust the earnings and ranks in the context of a program for genetic improvement of Thoroughbred horses in Algeria. [less ▲]

Detailed reference viewed: 21 (1 ULg)
Peer Reviewed
See detailGenetic parameters of racing performance traits of Arabian horses in Algeria
Tennah, Safia ULg; Kafidi, Nacereddine; Antoine-Moussiaux, Nicolas ULg et al

Poster (2013, October 11)

The data used in the present study were recorded at the Algerian Horse Racing Society for 36492 racing performance of 913 Arabian horses from 1995 to 2007. The aim of the study was to identify the genetic ... [more ▼]

The data used in the present study were recorded at the Algerian Horse Racing Society for 36492 racing performance of 913 Arabian horses from 1995 to 2007. The aim of the study was to identify the genetic parameters underlying three traits: two earnings traits, namely the logarithm of average annual virtual earnings (LAEV) and the logarithm of average annual virtual earnings per start (LAEV/S), and a ranking trait, the normalized ranking (PERF). To identify the fixed effects to be included in the genetic mixed model, a preliminary analysis was conducted using the General Linear Models (GLM) procedure from SAS software. The effects of age, sex, year and the interaction between year of the race and age and between sex and age were included in the model for the three traits. Afterwards, two random effects, a direct genetic effect of the animal and a permanent environmental effect were included in the mixed model. The variance components and genetic parameters were estimated using the restricted maximum likelihood (REML) procedure with the MTDFREML program. The analyses with this repeatable animal model led to the following estimation of the genetic parameters: for LAEV, heritability was 0.225 (±0.041), while estimate of repeatability was 0.330 (±0.040). For LAEV/S, heritability was 0.164 (±0.027), while estimate of repeatability was 0.215 (±0.022). The heritability for the normalized ranking was higher, 0.369 (±0.054), indicating that this trait might provide faster progress for breeding programs of Arabian horses in Algeria. The repeatability estimate for the normalized ranking was 0.587 (±0.045). The genetic correlation between LAEV and LAEV/S was 0.99, revealing a almost complete genetic dependence between these two traits, 0.69 between PERF and LAEV and 0.79 between PERF and LAEV/S. [less ▲]

Detailed reference viewed: 24 (0 ULg)
Full Text
See detailEvaluation of some production parameters in Kabyle local rabbit population
Moula, Nassim ULg; Michaux, Charles ULg; Do Duc, Luc ULg et al

Poster (2013, October 11)

In Algeria, the rabbit production is mainly based on local population to ensure a cheap supply of urban markets proteins. This sector may represent an important source of protein which is in large deficit ... [more ▼]

In Algeria, the rabbit production is mainly based on local population to ensure a cheap supply of urban markets proteins. This sector may represent an important source of protein which is in large deficit in the country. The rabbit production can be justified by its advantages such as short life cycle and high prolificacy. The objective of the present study is to evaluate production performances of Kabyle local rabbit population. Litter size, growth rate, body slaughter weight, feed conversion ratio and mortality rate are considered. The experiment was carried out on 30 animals (6 males and 24 females) for reproduction in the Ath Waghlis region (north-east Algeria). Rabbits have been raised in pens with 1 male and 4 females per pen. The commercial feed was supplied ad libitum to animals. Results reported shown that total number of rabbits born, number born alive, number to weaned, slaughter weight at 84 days of age, feed conversion ratio (from weaning to slaughter) and survival rate (from birth to slaughter) were 7.1, 6.1, 5.3 rabbits, 1.90kg, 3.16 and 73% respectively. The performances of the Kabyle breed could be improved by purebred selection as well as by crossing with exotic breeds. [less ▲]

Detailed reference viewed: 45 (17 ULg)
Full Text
Peer Reviewed
See detailBacterial diversity and its evolution during storage of fresh beef from different origins under different atmosphere and temperature conditions
Didimo Imazaki, Pedro Henrique ULg; Tahiri, Assia ULg; Taminiau, Bernard ULg et al

Poster (2013, October 11)

The purpose of this study was to evaluate the bacterial diversity and its evolution during storage of fresh beef, depending on its origin, packaging and storage temperature. Two batches of three vacuum ... [more ▼]

The purpose of this study was to evaluate the bacterial diversity and its evolution during storage of fresh beef, depending on its origin, packaging and storage temperature. Two batches of three vacuum packed striploins from United Kingdom and Belgium were obtained from a food wholesaler located in the Walloon Region. Fifteen days after slaughter, the striploins were sliced and individually kept under vacuum for 30 days: i) at −1 °C; ii) at +4 °C and iii) at −1 °C for 15 days and then at +4 °C for 15 days. The bacterial diversity was evaluated by metagenomic approach 15, 30 and 45 days after slaughter. Furthermore, each 15 days part of the vacuum packed striploin slices were repacked under modified atmosphere (70 % O2/30 % CO2), stored at +4 °C for 2 days and at +8 °C for 5 days, and then analyzed. Metagenomic analysis revealed a selection of the initial flora depending on atmosphere and temperature conditions. The development of Lactobacillus algidus was favored in samples preserved under vacuum at −1 °C, while a predominance of Lactococcus piscium was observed for samples stored at +4 °C. Moreover, storage under modified atmosphere favored the development of Leuconostoc gasicomitatum. These microorganisms have already been isolated from beef, but no study has evaluated their role in food conservation. The next step of this study will be to isolate and characterize strains of Lactobacillus algidus from meat and to assess their bioprotective potential. [less ▲]

Detailed reference viewed: 33 (10 ULg)
Full Text
See detailVitrification of immature equine oocytes
Gatez, Carine ULg; Ectors, Fabien ULg; Farnir, Frédéric ULg et al

Poster (2013, October 11)

Detailed reference viewed: 16 (0 ULg)
Full Text
See detailCaractérisation de la race ovine Tazegzawth en Algerie: description morpho-biométrique et détermination d’une formule barymétrique
Moula, Nassim ULg; Philippe, François-Xavier ULg; Do Duc, Luc ULg et al

Poster (2013, October 11)

Le mouton Azegzaw est de robe blanche avec des taches noires à reflets bleuâtres sur le chanfrein, le pourtour des yeux et le lobe des oreilles. Non répertoriée par le standard des races ovines ... [more ▼]

Le mouton Azegzaw est de robe blanche avec des taches noires à reflets bleuâtres sur le chanfrein, le pourtour des yeux et le lobe des oreilles. Non répertoriée par le standard des races ovines algériennes, cette race présente pourtant des qualités intéressantes d'adaptation aux régions montagneuses de Kabylie, ce qui justifie la mise en œuvre d’un programme de conservation de ce patrimoine génétique original. L’objectif de cette étude, est (1) de caractériser la morpho-biométrie de moutons de race Tazegzawth et (2) de déterminer des équations barymétriques destinées à l’estimation du poids vif (PV) au départ des mensurations corporelles (périmètre thoracique: PT ; longueur du corps: LDC ; hauteur au garrot : HG ; hauteur à la croupe : HC). Au total, 89 sujets adultes (12 mâles, 77 femelles) sont concernés par cette étude. Les mensurations corporelles moyennes observées sont : - PV: 41,53±0,53 kg (mâle: 46,71kg et femelle: 40,72kg) ; - PT: 73,52±0,45 cm (mâle: 78,37cm et femelle: 72,77cm) ; - LDC: 89,10±0,44 cm (mâle: 93,82cm et femelle: 88,37cm) ; - HG: 71,40±0,43 cm (mâle: 76,06cm et femelle: 70,68cm); - HC: 70,14±0,42 (mâle: 74,80cm cm et femelle: 69,42). Les formules retenues pour l’estimation du PV sont: - Tous sexes confondus : PV=-0,025 HG2 + 4,78HG-169,88 (R2=0,87) - Femelles : PV = -0,038HG2 +6,58HG-232,39 (R2=0,84) - Mâles : PV = -0,16LDC2+0,21 HC2+284,92 (R2=0,99) En dépit de l’échantillon réduit dans l’étude, celui-ci a révélé des caractéristiques relativement homogènes. La détermination d’une formule barymétrique pourra venir en soutien d’une sélection incluant un objectif de croissance. [less ▲]

Detailed reference viewed: 138 (30 ULg)
Full Text
See detailGrowth performance and meat quality of stress negative Piétrain pigs in the tropics: the case of Vietnam
Ha Xuan, Bo; Do Duc, Luc ULg; Moula, Nassim ULg et al

Poster (2013, October 11)

This study was carried out at the animal farm of Hanoi University of Agriculture, Vietnam to evaluate the growth performance and meat quality of stress negative Piétrain pigs. The study concerns the body ... [more ▼]

This study was carried out at the animal farm of Hanoi University of Agriculture, Vietnam to evaluate the growth performance and meat quality of stress negative Piétrain pigs. The study concerns the body weight (BW) of 116 pigs at 7.5 months of age and the ultrasound measurements on 83 live animals in order to determine backfat thickness, longissimus muscle depth and lean meat percentage (LM). Meat color (C.I.E L*, a* and b*), peak shear force (SF), pH at 24h (pH24) and at 45 minutes (pH45) post mortem were measured on 31 meat samples. Meat chemical composition (dry matter, protein, lipids and ash) was determined on 23 meat samples. All the data were analyzed according to a linear fixed model including gender effect (female and intact males) and Halothane genotype (CC and CT). The interaction between gender and genotype was not observed and therefore it was ignored from the final model. The results show that BW and LM were not significantly different between genotypes (P>0.21) while females were heavier than males (101.11 vs. 93.85 kg, P=0.0011). LM of female and male were respectively 63.27 and 63.56%. Gender and genotype didn’t affect meat quality and chemical composition (P>0.05) except pH24 (P=0.0011), a* (P<0.0001) and lipids (P=0.0012) for gender effect. The pH45 (6.50 and 6.45 for females and males) and pH24 (5.34 and 5.49 for females and males) were in the range corresponding to a normal meat. The obtained results show that stress negative Piétrain pigs have high lean meat percentage and satisfactory meat quality under tropical climatic conditions in Vietnam. [less ▲]

Detailed reference viewed: 30 (9 ULg)
Full Text
See detailEncapsulation de micro-algues dans un matériaux hybride alginate-silice et production de molécules à hautes valeur ajoutée
Duprez, Marie-Eve; Mirisola, A; Desmet, Jonathan et al

Poster (2013, October 10)

Les micro-algues sont des micro-organismes photosynthétiques. Leur croissance en milieu aqueux nécessite un apport lumineux (l = 400 à 700 nm) ainsi qu’un apport en carbone et en nutriments (N, P, S, etc ... [more ▼]

Les micro-algues sont des micro-organismes photosynthétiques. Leur croissance en milieu aqueux nécessite un apport lumineux (l = 400 à 700 nm) ainsi qu’un apport en carbone et en nutriments (N, P, S, etc.). Certaines souches, Dunaliella sp. par exemple, sont couramment utilisées dans le cadre de la biosynthèse de caroténoïdes[1] (b-carotène, lutéine entre autres). Quelques recherches ont montré qu’il était possible de réaliser l’extraction in situ des métabolites produits dans un réacteur biphasique (le b-carotène hydrophobe est extrait dans une phase organique biocompatible telle que le décane ou le dodécane) [2,3,4,5]. Le projet FOTOBIOMAT (subsidié par le programme Greenomat de la Région Wallonne – Belgique) a pour but de développer un nouveau type de photobioréacteur dans lequel sont mises en oeuvre les micro-algues encapsulées dans des billes constituées d’un matériau hybride. Le processus de photosynthèse est ainsi utilisé afin de convertir du CO2 en composés à haute valeur ajoutée (b-carotène p. ex.). La viabilité des micro-algues encapsulées doit être très importante (min. 6 mois). Idéalement, le b-carotène produit devrait être récupéré par une voie “propre” et ce, quasi en continu. [less ▲]

Detailed reference viewed: 48 (4 ULg)
Peer Reviewed
See detailUse of on-line flow cytometry to detect segregation in the microbial population
Brognaux, Alison ULg; Zune, Quentin ULg; Han, Shanshan et al

Poster (2013, October 08)

Detailed reference viewed: 31 (10 ULg)
Full Text
See detailInterpolation of SLA Using the Data-Interpolating Variational Analysis in the Coastal Area of the NW Mediterranean Sea
Troupin, Charles ULg; Barth, Alexander ULg; Beckers, Jean-Marie ULg et al

Poster (2013, October 07)

The spatial interpolation of along-track Sea-Level Anomalies (SLA) data to produce gridded map has numerous applications in oceanography (model validation, data assimilation, eddy tracking, ...). Optimal ... [more ▼]

The spatial interpolation of along-track Sea-Level Anomalies (SLA) data to produce gridded map has numerous applications in oceanography (model validation, data assimilation, eddy tracking, ...). Optimal Interpolation (OI) is often the preferred method for this task, as it leads to the lowest expected error and provides an error field associated to the analyzed field. However, the method suffers from limitations such as the numerical cost (due to the inversion of covariance matrices) as well as the isotropic covariance function, generally employed in altimetry. The Data-Interpolating Variational Analysis (DIVA) is a gridding method based on the minimization of a cost function using a finite-element technique. The cost function penalizes the departures from observations, the smoothness of the gridded field and physical constraints (advection, diffusion, ...). It has been shown that DIVA and OI are equivalent (provided some assumptions on the covariances are made), the main difference is that in DIVA, the covariance function is not explicitly formulated. The technique has been previously applied for the creation of regional hydrographic climatologies, which required the processing of a large number of data points. In this work we present the application and adaptation of Diva to the analysis of SLA in the Mediterranean Sea and the production of weekly maps of SLA in this region. The peculiarities of SLA along-track data are addressed: • number of observations: the finite-element technique coupled to improvements in the matrix inversion (parallel or iterative solvers) lead to a decrease of the computational time, meaning that sub-sampling of the initial data set is not required. • quality of the different missions: the weight attributed to each data point can be easily set according to the satellite that provided the observations, so that different measurement noise variances are considered. • spatial correlation scale: it varies spatially in the domain according to the value of the Rossby radius of deformation. • long-wavelength errors: each data point is associated a class, and a detrending technique allows the determination of the trend for each class, leading to a reduction of the inconsistencies between missions. • anisotropy of physical coastal features: a pseudo-velocity field derived from regional bathymetry enhances the correlations along the main currents. Particular attention will be paid to the influence of this constraint in the coastal area. The analysis and error fields obtained over the Mediterranean Sea are compared with the available gridded products from AVISO. Different ways to compute the error field are compared. The impact of the use of multiple missions to prepare the gridded fields is also examined. In situ measurements from an intensive multi-sensor experiment carried out north of the Balearic Islands in May 2009 serve to assess the quality of the gridded fields in the coastal area. [less ▲]

Detailed reference viewed: 50 (2 ULg)
Full Text
See detailInsertion of domain III of Bacillus subtilis and Bacillus amyloliquefaciens PBP4a in the Bacillus licheniformis BlaP β-lactamase to study the binding to peptidoglycan and whole bacteria
Van Der Heiden, Edwige ULg; Hoebreck, Charline ULg; Freichels, Régine ULg et al

Poster (2013, October 03)

Domain III of Bacillus subtilis and B. amyloliquefaciens DD-endopeptidase PBP4a was introduced in the BlaP beta-lactamse of Bacillus licheniformis. Domain III of Bacillus licheniformis binds to ... [more ▼]

Domain III of Bacillus subtilis and B. amyloliquefaciens DD-endopeptidase PBP4a was introduced in the BlaP beta-lactamse of Bacillus licheniformis. Domain III of Bacillus licheniformis binds to peptidoglycan of Bacillus subtilis 168 and to itself whole cells. [less ▲]

Detailed reference viewed: 72 (10 ULg)
Full Text
Peer Reviewed
See detailAssessment of bacterial persistence in mosquitoes according to microinjection assays in Belgium
Raharimalala, Fara Nantenaina ULg; Bawin, Thomas ULg; Boukraa, Slimane ULg et al

Poster (2013, October 02)

The problems caused by the massive used of pesticides have resulted in the establishment of resistant vectors besides the destruction of the environment. Furthermore, climate change has consequently ... [more ▼]

The problems caused by the massive used of pesticides have resulted in the establishment of resistant vectors besides the destruction of the environment. Furthermore, climate change has consequently modified the comportment of disease vectors. Current research tends to look for alternative means to overcome the problem. The goal of that study was to undertaken the way there this objective. By their presence or absence, endosymbiotic microorganisms can influence vector competence and vectorial capacity. Our research aims to study the effect of the introduction of endosymbiotic bacteria in the mosquito species that could be potential vectors of disease in Belgium. Method used was the microinjection of endosymbiotic bacteria within the detected exempt mosquito species. Three genus of suspected vectors belonging to Aedes, Anopheles and Culex were microinjected at different stages of their life cycle (eggs, larvae, pupae, and adults), and survivability of mosquitoes and persistence of microorganism were determined. Results show that survival in the different stages was variable. Furthermore, persistence of endobacteria was different depending genus and stages studied [less ▲]

Detailed reference viewed: 55 (24 ULg)
Full Text
Peer Reviewed
See detailBacterial diversity of field-caught mosquitoes from different regions of Belgium and potential impact on virus transmission
Raharimalala, Fara Nantenaina ULg; Boukraa, Slimane ULg; Bawin, Thomas ULg et al

Poster (2013, October 02)

Several vectors disease presented a resistance to various pesticides currently used. Endosymbiotic bacteria was an alternative solution found because of their probably interactive effects with their host ... [more ▼]

Several vectors disease presented a resistance to various pesticides currently used. Endosymbiotic bacteria was an alternative solution found because of their probably interactive effects with their host. According to the introduction risks of these virus and disease dispersion, we propose to investigate the bacterial endosymbiont role in Culicidae in Belgium. Among the 30 species of mosquitoes identified in this country, about ten are considered as potential vectors of arboviruses. In this study, eleven species of Culicidae belonging to five genera (Culex pipiens s.l., Cx. torrentium, Cx. hortensis, Anopheles claviger, An. maculipennis s.l., An. plumbeus, Culiseta annulata, Ochlerotatus geniculatus, Oc. dorsalis, Aedes albopictus and Coquillettidia richiardii) mosquitoes fields from eight sites of Belgium were used for the screening of the presence of six genera endosymbiotic bacteria (Wolbachia sp, Commamonas sp, Delftia sp, Pseudomonas sp, Acinetobacter sp and Asaia sp) according their possible impact in mosquito biology. PCR was done for the screening of endosymbiotic bacteria mosquitoes studied. A total of 176 individuals (144 larvae and 32 adults) were used. Our results allowed us to confirm the absence of Wolbachia in An. clavigere, An. maculipennis s.l and Cx. torentium. Acinetobacter was found in every species. Current advances in understanding the mosquito–microbiota relationships may have a great impact in a better understanding of some traits of mosquito biology and in the development of innovative mosquito-borne disease-control strategies aimed to reduce mosquito vectorial capacity and/or inhibiting pathogen transmission. [less ▲]

Detailed reference viewed: 55 (16 ULg)
Full Text
See detailANAEROBIC DIGESTION OF ORGANIC WASTES FROM AGRO-FOOD ACTIVITIES IN TUNISIA
Mhiri, F; Hiligsmann, Serge ULg; Sayahi, L. et al

Poster (2013, October 01)

Detailed reference viewed: 10 (1 ULg)
Full Text
Peer Reviewed
See detailImpact of anti-androgenic substances on gametogenesis of the rotifer Brachionus calyciflorus
Cruciani, Valentina ULg; Thomé, Jean-Pierre ULg; Joaquim-Justo, Célia ULg

Poster (2013, October 01)

Several studies have shown that pollutants with anti-androgenic activity have an impact on the sexual reproduction of the rotifer Brachionus calyciflorus (Joaquim-Justo et al., submit; Preston et al ... [more ▼]

Several studies have shown that pollutants with anti-androgenic activity have an impact on the sexual reproduction of the rotifer Brachionus calyciflorus (Joaquim-Justo et al., submit; Preston et al., 2001). The effects observed are compatible with the phenomenon of endocrine disruption. Fenitrothion, a non-steroidal anti-androgen induces a decrease in fertilization rate following exposure below or equal to 0,5 mg L-1.. The steroidal anti-androgen, cyproterone acetate increases number of cysts in population exposed to concentrations below or equal to 0,5 mg L-1. Cross mating experiments showed that effects of fenitrothion are due to an impact on males exclusively, while effects of cyproterone acetate exposition are due to an impact on females exclusively. In this study, we investigated the impact of fenitrothion on spermatogenesis and observed a decrease in the spermatozoa production and mobility with concentrations down to 0,5 mg L-1. We report a detailed description of the morphology of the male reproductive apparatus in B. calyciflorus based on optic, transmission electron and scanning electron microscopy in controls and exposed individuals. [less ▲]

Detailed reference viewed: 33 (5 ULg)
Full Text
See detailImpact of growth rate on the distribution of visually strength-graded West-European Douglas-fir boards
Henin, Jean-Marc; Hebert, Jacques ULg; Jourez, Benoît ULg

Poster (2013, October)

Douglas-fir is a relatively new species within the forest landscape of Wallonia (Southern Belgium). Consequently, some uncertainties remain regarding how to keep full advantage of its high productivity as ... [more ▼]

Douglas-fir is a relatively new species within the forest landscape of Wallonia (Southern Belgium). Consequently, some uncertainties remain regarding how to keep full advantage of its high productivity as well as of the good properties of its wood. Moreover, the recent implementation of the timber strength grading (Council Directive 89/106/EEC) is likely to sensitize forest managers and the sawing industry to the impact of sylviculture on the resource quality. In that context, this research aimed at assessing to what extent the ring width of the trees (RWtree) and the mean girth increment of the stands (MGI) influences, in the frame of a visual strength grading, the distribution of the boards they produce. The experimental material was derived from 33 trees (girth range of between 120cm and 170cm) originating from 11 Douglas-fir stands (age range of between 41 and 69 y.o.) representative of contrasting sylvicultural management practices: RWtree ranged from 3 to 6 mm. From a bolt located 6 to 8.2m height in the standing trees, boards (38X100X2100mm³) were sawn and graded according to the Belgian Standard NBN B 16-520. This research evidenced that: - Only the Knot Area Ratio (KAR) impedes boards to be employed in structural uses. Practically, no board having a KAR allowing S10 grading (S10 corresponds to C30 as defined in EN338) exhibits a ring width higher than 6mm, which is the maximum value accepted for S10 grading (according to NBN B 16-520). These observations demonstrate the highly prevailing character of the knottiness regarding the boards’ grading; - 87% of the boards produced by trees from RWtree≥5mm can be used in structural uses, but only 7% can be classified into S10 strength class. In comparison, trees with RWtree<4.5mm also provided 87% of boards which can be used in structure, but 18% of the boards can be graded into S10 strength class; - 89% of the boards produced by stands with MGI>3cm/year are accepted for structural uses, but only 9% are graded into S10 class. Regarding the stands with MGI≤3cm/year, these values are 89% and 24%, respectively. Growth rate thus doesn’t seem to affect the percentage of Douglas-fir boards fit for structural uses. Dynamic sylviculture however significantly decreases the percentage of boards graded into S10 strength class: although it should be supported by financial assessments, early pruning thus seems highly advisable in a context of dynamic sylviculture. [less ▲]

Detailed reference viewed: 23 (2 ULg)
Full Text
See detailHerschel observations of nebulae ejected by massive evolved stars
Vamvatira-Nakou, Chloi ULg; Hutsemekers, Damien ULg; Royer, P. et al

Poster (2013, October)

We have obtained far-infrared Herschel PACS imaging and spectroscopic observations of nebulae associated to massive evolved stars. The study of these nebulae is crucial to understand the evolution of ... [more ▼]

We have obtained far-infrared Herschel PACS imaging and spectroscopic observations of nebulae associated to massive evolved stars. The study of these nebulae is crucial to understand the evolution of these stars as it can reveal the mass-loss history. The infrared images along with available data at other wavelengths give a complete view of their morphology. The dust modeling provides the dust parameters, such as the temperature, the mass and the composition of dust. The spectroscopic analysis provides the gas C,N,O abundances and mass. Based on these observations, the evolutionary status of the star at the time of the nebula ejection can be constrained. We present here selected results of an ongoing exhaustive study of nebulae around low- and high-luminosity LBVs (AG Car, HR Car, WRAY 15-751, G79.29+0.46, HD168625), WN stars (NGC6888, M1-67, He3-519) and Of stars (NGC6164/5). [less ▲]

Detailed reference viewed: 53 (34 ULg)
Full Text
Peer Reviewed
See detailEffectiveness of case management for maintaining frail older persons at home - intermediate results
Van Durme; Schmitz, Olivier; Cès, Sophie et al

Poster (2013, October)

Detailed reference viewed: 20 (2 ULg)
Full Text
Peer Reviewed
See detailRelative Contribution of Walking Speed, Ataxia and Gait asymmetry to the Composition of Gait in Multiple Sclerosis
PHAN BA, Remy ULg; Pierard, Sébastien ULg; LOMMERS, Emilie ULg et al

Poster (2013, October)

Introduction - Objective: Walking speed measured according to the T25FW is the most widely used descriptor of gait in MS clinical research and practice but other dimensions influencing gait variance exist ... [more ▼]

Introduction - Objective: Walking speed measured according to the T25FW is the most widely used descriptor of gait in MS clinical research and practice but other dimensions influencing gait variance exist according to alternative gait analysis methods. The relative importance of these different dimensions of gait relatively to its variance is unknown. Methods: We measured the performances of persons with MS and healthy subjects on the T25FW and the Timed 20-Meter Walk (T20MW) performed in tandem with a new gait analysis system (GAIMS). We performed a factorial analysis of variance to underline the main dimensions influencing gait variance and observed their composition. Findings - Conclusion: The main factor influencing gait variance in conventional walk tests is mostly composed of features related to walking speed. Balance, gait asymmetry and variability also participate to this variance but to a lesser extent. The inverse is observed in tests performed in tandem gait. [less ▲]

Detailed reference viewed: 58 (11 ULg)
See detailImaging mass spectrometry and proteomics of 3D cell cultures
Longuespée, Rémi ULg; Piron, Céline; Fléron, Maximilien et al

Poster (2013, October)

Detailed reference viewed: 16 (8 ULg)
See detailDesign of novel polyphosphoesters (co)polymers for improving a drug delivery system based on calcium carbonate particles
Ergül, Zeynep ULg; Boury, Frank; Debuigne, Antoine ULg et al

Poster (2013, October)

Biomedical applications, especially drug delivery systems, often require biodegradable and biocompatible materials that permit safe retention as well as controlled delivery of a drug. CaCO3 particles are ... [more ▼]

Biomedical applications, especially drug delivery systems, often require biodegradable and biocompatible materials that permit safe retention as well as controlled delivery of a drug. CaCO3 particles are safe and biodegradable drug carriers that have excellent properties such as low density, high specific surface areas and porosity for drugs microencapsulation. The encapsulation of a model protein within CaCO3 particles has been successfully investigated by Boury and coworkers but the release profiles still need to be improved. In this project, we would like to slow down the kinetics of protein release. One strategy consists in loading the CaCO3 particles with degradable micelles containing the protein/drug in their core. In this perspective, we have developed a novel class of degradable polyphosphoesters (PPE) (co)polymers able to self-assemble into micelles. Note that the degradation products of PPEs, like phosphates, associated with calcium from the inorganic carrier could favor some reconstruction processes like bone regeneration. Pendant carboxylic acid functions were introduced along the backbone of the copolymers in order to increase their affinity for calcium and facilitate their incorporation in the CaCO3 particles. First, an alkynyl-functionalized phospholane monomer, i.e. butynyl phosphate (BYP), was prepared by condensation of 2-chloro-2-oxo-1,3,2-dioxaphospholane and 3-butyn-1-ol (43 % yield), according to a reported procedure. Then, a series of well-defined (Ɖ < 1.2) alkyne-containing PBYP (co)polymers were synthesized by ring opening polymerization using 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and thiourea (TU) as catalysts[5] (see scheme below). The structures of the PPE (co)polymers were characterized by 1H NMR, 31P NMR and size exclusion chromatography (SEC). Next, carboxylic acid functions were introduced along the PPE backbone by click-type thiol-yne addition of mercaptopropionic acid onto the pendant alkynes. The degradability of the PPEs was investigated at different pH. In the future, the self-assembly behavior of the PPE-based copolymers will be studied as well as their drug loading capacity and ability to accumulate within the CaCO3 particles. In addition, the acid-bearing PPE-based copolymers will be tested as templating agents for the synthesis of CaCO3 particles. [less ▲]

Detailed reference viewed: 15 (2 ULg)
Full Text
Peer Reviewed
See detailECONOMIC IMPACT OF USING AN ANTIVIRAL IN THE CONTROL OF A FOOT-AND-MOUTH DISEASE EPIZOOTIC IN SOUTHERN BELGIUM
Dal Pozzo, Fabiana ULg; Humblet, Marie-France ULg; Vandeputte, Sébastien ULg et al

Poster (2013, October)

Foot-and-mouth disease virus (FMDV) is a highly contagious pathogen of cloven-hoofed mammals and one of the biggest concerns for veterinary authorities. The control measures to be applied in case of an ... [more ▼]

Foot-and-mouth disease virus (FMDV) is a highly contagious pathogen of cloven-hoofed mammals and one of the biggest concerns for veterinary authorities. The control measures to be applied in case of an outbreak vary in function of the disease-free or disease-enzootic status. Vaccination depends on the prior identification of the involved viral serotype and subtype, it confers an immunity limited to 6 months and it requires between 4 to 7 days to trigger the immune response (i.e. immunity-gap). The use of anti-FMD drugs has been discussed as an alternative or supplementary method to be used in previously FMD-free countries/zones. Such an antiviral treatment could protect against the viral dissemination to fill the gap between vaccination and the rise of a protective immunity. Apart from broad spectrum antiviral agents, such as ribavirin, specific anti-FMDV molecules have been identified in vitro, but none of them has been used in clinical studies involving ruminants or pigs. Next to the anti-FMDV activity, the absence of toxicity and the withdrawal period influencing the food safety, the cost of the treatment would be another important parameter influencing the potential use of an antiviral agent in the control of a FMD outbreak. The aim of this study was to assess the economic impact of using an antiviral in the control of a FMD epizootic in southern Belgium (Walloon Region). This work was based on the results of previous investigations concerning the epidemiological and economic data of a FMD outbreak in Southern Belgium. In the considered scenario, the epizootic was caused by the introduction of an infected cow (during the incubation time) in a beef cattle farm during winter. During the two weeks between the brood cow introduction and the official declaration of the outbreak, animal movements occurred between other beef cattle farms. The economic effects of the epidemic were evaluated taking into account the air-borne transmission of FMDV, the occurrence of animal movements (two scenarios were considered, with a minimum of 2 and a maximum of 17 movements), the presence of bovine and small ruminant farms, as well as pig farms in the protection and surveillance zones around the initial and secondary outbreaks. The wild fauna was not involved in the epidemic. In order to integrate in the above scenario the application of an antiviral agent in the control of the disease, it was assumed that the efficacy of the anti-FMDV drug was proven by reducing viral excretion in infected animals as well as by preventing the infection in animals at risk. Two hypothetical prices were used to introduce in the model the costs related to the administration of the antiviral drug (5€ and 10€ per dose). Furthermore, different strategies of control could be envisaged, such as the administration of the drug to both domestic ruminants and pigs, or depending on the epidemiological role of these species in the FMD transmission and their density in the territory, the administration of the drug to only one of them. Other scenarios could be characterized by the use of the antiviral in the control of the epizootic within the protection and surveillance zones or in only one of them. The costs associated with the use of antivirals in the different proposed scenarios are compared to the costs and socio-economic losses associated with the FMD outbreak and the implementation of control measures. [less ▲]

Detailed reference viewed: 14 (3 ULg)