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See detailTesting methods applicable to refrigeration components and systems
Quoilin, Sylvain ULg

Poster (2008, October)

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See detailSpatial and interannual variability of the Schyphozoan medusae, Pelagia noctiluca (Forksål), in the Bay of Calvi (Corsica)
Collignon, Amandine ULg; Goffart, Anne ULg; Lejeune, Pierre et al

Poster (2008, October)

The temporal distribution of the Schyphozoan medusae Pelagia noctiluca (Forksål) has been examined weekly in the oligotrophic coastal waters of the Bay of Calvi (Corsica) from 2003 to 2008. The ... [more ▼]

The temporal distribution of the Schyphozoan medusae Pelagia noctiluca (Forksål) has been examined weekly in the oligotrophic coastal waters of the Bay of Calvi (Corsica) from 2003 to 2008. The observations show a gradual increase of jellyfish number in 2004 to 2005, followed by a dramatic increase in the 2006 and a significant reduction in summers 2007 and 2008. The numeration of ephyra larvae in plankton and ovarian histology show a higher reproduction in June 2006. An analysis of the spatial distribution of the Pelagia noctiluca in the area of the Bay of Calvi emphasises that during the 2006 bloom, most of the organisms are present at a distance of the coastline where they are forming actives swarms of 200 m of length with 5 to 10 individual per m3. In the swarms, the individuals are healthful and swim actively in the upper layer (10 t 60 m) with tentacles extended, probably catching the food. The swarms are generally located around wind-protected area where the surface turbulence is reduced and where zooplankton is accumulating. Sometimes, the swarms migrate vertically probably in relation with changes of wind conditions. In some cases, moribund individuals partially destroyed or at the end of their biological cycle escape from active swarms and drift passively, at the surface, under the action of water movements, into coastal waters and beaches where they accumulate and reach 200 individual per m3. In these passive swarms the individuals continue to swim slowly but are actively fed by some Sparid fish. [less ▲]

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See detail. Do innervation of germinal centre and contacts between FDC and nerve fibers be keys to understand the susceptibility difference between bovines and humans to the BSE agent?
Defaweux, Valérie ULg; Dorban, G.; Antoine, Nadine ULg et al

Poster (2008, October)

Background: In regard to BSE and vCJD, the agent tropism for lymphoid tissues is completely different even if the infectious strain responsible and the way of inoculation are identical. During vCJD, the ... [more ▼]

Background: In regard to BSE and vCJD, the agent tropism for lymphoid tissues is completely different even if the infectious strain responsible and the way of inoculation are identical. During vCJD, the infectious agent crosses the digestive barrier and multiplies in lymphoid organs, before progressively reaching the brain. Indeed, in vCJD, it accumulates in the ileum, tonsils, spleen and appendix of infected individuals. In contrast, in cattle, the BSE agent has a low affinity for lymphoid tissues and mainly accumulates in the nervous system. During preclinical stages, infectivity, other than that in the peripheral nervous system or central nervous system, is confined in the distal ileum of orally infected cattle. So, it appears that, at least in the case of BSE and vCJD, host properties can influence the accumulation of the infectious agent in lymphoid organs. Objectives and methods: In this study, we analysed by confocale microscopy the mucosal innervation and the interface between nerve fibres and FDC in bovine and human tonsils using a panel of antibodies. Since differences in the innervation of lymphoid organs depending on species and on age have been reported, we analysed two categories of bovines (calves less than 12 months old and bovines older than 24 months) and two categories of humans (patients less than 5 years old and patients older than 25 years). Results: In both species, ways of innervation by-passing germinal centres could be postulated: nerve fibres are widely distributed in antigen/cell traffic area: the lamina propria, the interfollicular zone and the lymphoepithelial area. We pointed out that, only in tonsils of bovines older than 24 months, nerve fibres are observed to be in contact with FDC. In contrast, in human tonsils, no nerve fibres established contacts with FDC, whatever the age. Discussion: Innervation of germinal centres can be said to be an age-dependent dynamic process in bovines. The weak innervation of the secondary lymphoid organs could thus be a rate-limiting step to neuroinvasion in humans. This species difference could influence the way of neuroinvasion and thus, the susceptibility of bovines and humans to the BSE agent. [less ▲]

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See detailIn vitro modelisation of prions neuroinvasion mediated by dendritic cells
Dorban, G.; Defaweux, Valérie ULg; Heinen, Ernst ULg et al

Poster (2008, October)

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See detailIntrasaccular injection of aminoglycosides: a novel method for temporary damaging fish inner ear hair cells
Faucher, Karine ULg; Aas-Hansen, Øyvind; Damsgard, Borge et al

Poster (2008, October)

Fish models are increasingly being used for hearing research investigations. Aminoglycoside antibiotics that are used for damaging the inner ear hair cells can have systemic side effects leading to death ... [more ▼]

Fish models are increasingly being used for hearing research investigations. Aminoglycoside antibiotics that are used for damaging the inner ear hair cells can have systemic side effects leading to death of study animals. This study aimed to compare two methods: i) systemic (intravenous) and ii) local (intrasaccular) gentamicin administration for induction of inner ear hair cell damage in the Atlantic cod, Gadus morhua (L.). Hair cell damage was assessed using scanning electron microscopy; hair cell density, prevalence of immature hair cells and kinocilia length were measured. Gentamicin-treated fish were compared with control and sham fish. Intravenous gentamicin led to dose-dependent mortality caused by nephrotoxicity. The only visible effect after treatment was more immature hair cells and shorter kinocilia, the effect on hair cell density was equivocal. Following intrasaccular gentamicin treatment, fish mortality was negligible, and hair cells were damaged regardless of dose. Here, we observed decreased hair cell density, high prevalence of immature hair cells, and significantly shortened kinocilia. Conclusion: intrasaccular injection is preferable to intravenous injection of gentamicin for the study of ototoxicity in the Atlantic cod. [less ▲]

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See detailFractionation process to produce a new milk ingredient enriched in phospholipids and sphingolipids
Bodson, P.; Dalemans, D.; Danthine, Sabine ULg et al

Poster (2008, October)

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See detailASPERGER SYNDROME: Clinical picture at a 5-year-old boy and diagnostic work of assessment.
Philippe, Paule ULg; Scholl, Jean-Marc ULg

Poster (2008, October)

The child's parents consulted the Liege Autism Référence Center at Liège in 2007; the child was 5 years old. The main difficulties arise at school: the child does not follow the orders, disrupts the class ... [more ▼]

The child's parents consulted the Liege Autism Référence Center at Liège in 2007; the child was 5 years old. The main difficulties arise at school: the child does not follow the orders, disrupts the class; but except the school, he is very curious to learn, he possesses a surprising vocabulary and memory at his age The multidisciplinary team realized the clinical diagnostic work of assessment (neuropsychological tests, observations at school, at home, during consultations).The various examinations realized previously were consulted and gathered. This poster resume parents observations, assesment results, hypothesis of neurophysiology,of diagnosis following DSM IV, Zero to Three .It's present also our proposition of coverage(care) and orientation. [less ▲]

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See detailUnderwater Imagery, a Measuring Tool to Extend the Spatio-Temporal Understanding of Benthic Organisms Dynamics: Case Study of Codium elisabethae in the Azores.
Sirjacobs, Damien ULg; Tempera, Fernando; Cardigos, Frederico et al

Poster (2008, October)

Benthic habitat mapping studies have been increasingly exploiting the use of underwater images to collect information on substrate nature and biological coverage. Concurrently, research has been ongoing ... [more ▼]

Benthic habitat mapping studies have been increasingly exploiting the use of underwater images to collect information on substrate nature and biological coverage. Concurrently, research has been ongoing to develop methods that use the imagery collected to conduct regular quantitative monitoring studies of biological resources distributed over large areas. This study provides the first multi-annual monitoring information on the dynamics of a benthic macroalgae population derived from underwater imagery collected by scuba divers in the Monte da Guia Site of Community Importance /Natura 2000 network (Faial isl. Azores, NE Atlantic). The green alga Codium elisabethae - a long-living green alga that represents a potential good indicator of coastal environmental change - was chosen for the study. The analyses focus on using the underwater imagery to quantify seasonal fluctuations of density, percentage cover, biomass, growth rate and primary production of the species. Two study sites were investigated: one was located in a sheltered no-go reserve exhibiting a dense C. elisabethae population, and the other in a location experiencing more exposed conditions and holding a sparser population. Between August 2003 and November 2005, fifteen (15) photo coverages were collected by scuba-divers. Subsequent processing consisted of producing image mosaics and using automated and interactive change detection methods that recognized, measured and counted individuals present in photos of fixed quadrats and yielded dynamical parameters such as population structures, growth, recruitment, and mortality. Chi-square tests of image-derived estimates and in situ measurements confirmed the validity of a centimeter precision estimation of population structure for individuals above 4 cm diameter. Important variability of population structure and density were observed at small spatial scales. Population density showed a sharp reduction in autumn 2003 and did not show a full recovery in spring and summer 2004. During the following year, population of the protected site maintained density and biomass, while at the exposed site population density dropped. The production of information based on observations of thousands of individuals is mandatory in biological population statistics. The presented imagery approach made it possible, avoiding the need to collect all the measurements and quantitative information during time-constrained SCUBA diving operations. [less ▲]

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See detailEcology and silviculture of black alder (Alnus glutinosa (L.) Gaertn.)
Claessens, Hugues ULg; Oosterbaan, Anne; Savill, Peter

Poster (2008, October)

Black alder (Alnus glutinosa (L.) Gaertn.) is widespread across Europe, both in forest and on open land along the watercourses. It plays a major role in nature conservation, thanks to its relation with ... [more ▼]

Black alder (Alnus glutinosa (L.) Gaertn.) is widespread across Europe, both in forest and on open land along the watercourses. It plays a major role in nature conservation, thanks to its relation with the river ecosystems and its network distribution on open land. [less ▲]

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See detailEvaluation of sedation depth and quality of performed procedures following administration of α2-agonists combined or not with butorphanol in horses.
Barbry, Stephanie; Verwilghen, Denis ULg; Van Galen, Gaby ULg et al

Poster (2008, October)

Several molecules available in equine medicine provide profound sedation and good analgesia when performing diagnostic or surgical procedures. They differ slightly in degree of action, as well in time as ... [more ▼]

Several molecules available in equine medicine provide profound sedation and good analgesia when performing diagnostic or surgical procedures. They differ slightly in degree of action, as well in time as in depth. The aim of this study was to evaluate the depth of sedation and quality of performing a standardized procedure after injection of an 2-agonist alone or associated with butorphanol. Horses presented to the Equine Clinic of Liege University from December 2007 to June 2008 for an endoscopic, dental, radiological or ophthalmological examination of which owner and clinician agreed to include the horse in the study were retained. All horses (n=133) were sedated in a randomized double blind fashion using one of the six following protocols: detomidine (D) (0.01mg/kg IV), romifidine (R) (0.04mg/kg IV), or xylazine (X) (0.5mg/kg IV) alone or associated with butorphanol (B) (0.02mg/kg IV). Stability, head position and the reaction to a stimulus (auditive and visual) were evaluated before the start of the procedure. An overall subjective grade using a 10 cm line scale was given to evaluate sedation depth (ranging from no effect to maximal depth on line) and the quality of the performed procedure (ranging from not realised to ideal examination). For each specific procedure, the same clinician experienced in his particular field evaluated the parameters. Data were related by a variance analysis using SAS system and considered significant if P<0.01. The used protocols significantly influenced both sedation depth and examination quality. Sedation depth increased significantly when B was added in all the three 2-agonists used (mean ± SD): D: 6.46±0.33; D+B: 7.06±0.37; R: 4.93±0.46; R+B: 7.04±0.45; X: 4.94±0.43; X+B: 7.75±0.40. Detomidine provided a significantly better quality of the examination compared to romifidine and xylazine. The addiction of butorphanol significantly decreased the examination quality when added to detomidine and increased the quality when combined with romifidine and xylazine. Mean (± SD) of the quality of performed procedures: D: 8.41±0.54; D+B: 6.06±0.64; R: 6.68±0.71; R+B: 7.16±0.67; X: 4.47±0.67; X+B: 4.52±0.64. Comparison of sedation depth and quality of performed examination revealed an increase in quality of examination scores with increasing depth of sedation until a certain level. As from sedation depths with scores of 8 or more, a decrease in quality of examination was encountered. This report shows the important effect of butorphanol addition on sedation. However, increasing sedation depth was not necessarily linked to a better quality of procedure, notably due to difficulties in handling strongly sedated horses for the procedures performed in this study. [less ▲]

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See detailCoronography with a dynamic hologram
Ricci, Davide ULg; Le Coroller, Hervé; Piron, Pierre ULg

Poster (2008, September 26)

An innovative solution to improve the performances of coronagraphs consists in adding, in the optical scheme, a dynamic hologram removing most of the residual speckle starlight. Our simulations show that ... [more ▼]

An innovative solution to improve the performances of coronagraphs consists in adding, in the optical scheme, a dynamic hologram removing most of the residual speckle starlight. Our simulations show that the detection limit in the flux ratio between a host star and a very near planet, in the case of wavefront bumpiness imperfections at lambda/20 (resp. lambda/100), improves over a factor 1000 (resp. 10000) when equipped with a hologram, allowing to direct image an exo-Earth at a distance of 11 parsec with a 6.5m space telescope. [less ▲]

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See detailDinámica de la infección perinatal con Virus de la Leucosis Bovina en el rodeo lechero
Rossich, G.; Gutiérrez, G.; Rodriguez, Sabrina ULg et al

Poster (2008, September 22)

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See detailEstudio Comparativo de la asociación entre variantes genotípicas del Virus de la Leucemia Bovina y la forma clínica de la infección
Rodriguez, Sabrina ULg; Trono, K.; Jones, L.R.

Poster (2008, September 22)

Estudio Comparativo de la asociación entre variantes genotípicas del Virus de la Leucemia Bovina y la forma clínica de la infección. Sabrina M. Rodríguez1*, Karina Trono1, Leandro R. Jones1,2. 1 Instituto ... [more ▼]

Estudio Comparativo de la asociación entre variantes genotípicas del Virus de la Leucemia Bovina y la forma clínica de la infección. Sabrina M. Rodríguez1*, Karina Trono1, Leandro R. Jones1,2. 1 Instituto de Virología, CICVyA, INTA-Castelar. C.C. 77. C.P. 1712. Castelar, Buenos Aires, Argentina. 2 Dirección actual: Estación de Fotobiología Playa Unión. C.C. 15. C.P. 9103. Rawson, Chubut, Argentina. *E-mail: srodriguez@cnia.inta.gov.ar Introducción. El Virus de la Leucemia Bovina (BLV) es un retrovirus oncogénico que infecta bovinos y es el agente causal de la Leucosis Bovina Enzoótica. El resultado de la infección por BLV es diverso. La mayoría de los individuos infectados (70%) resultan portadores asintomáticos o aleucémicos (AL) y cerca del 25% desarrolla una condición benigna denominada Linfocitosis Persistente (LP). La forma tumoral o linfosarcoma (LS), afecta a un 1-5% de los bovinos infectados que desarrollan una neoplasia B- linfoproliferativa. Las bases genético-moleculares del desarrollo de estas variadas presentaciones clínicas de la infección por BLV son hasta el momento desconocidas. Las secuencias provirales de Repeticiones Terminales Largas (Long Terminal Repeats, LTR) de los retrovirus han sido implicadas en la determinación del tropismo, la virulencia y la patogenicidad, jugando, además, un rol importante en la oncogénesis. Sin embargo, la influencia de la variación genética en las regiones LTR sobre aspectos clínicos de la infección por BLV no ha sido todavía estudiada. Los objetivos de este trabajo fueron caracterizar estas regiones regulatorias y analizar la posible asociación entre las variaciones genéticas del LTR de BLV y las formas clínicas de la infección (AL, PL, LS). Materiales y Métodos. Se amplificó y secuenció la región LTR de 40 provirus obtenidos a partir de bovinos naturalmente infectados por BLV que presentaron las diferentes formas clínicas de la infección. La relación entre caracteres genotípicos y fenotípicos para cada posición variable del LTR fue evaluada mediante métodos comparativos filogenéticos. Para ello se utilizó una filogenia obtenida a partir de secuencias de la región env. La reconstrucción de caracteres en árboles-espejo se llevó a cabo mediante el programa Mesquite y el posterior análisis estadístico de los datos fue realizado mediante el Test Exacto de Fisher. Asimismo, se empleó el Test de Correlación de Pagel implementado en el programa BayesTraits-Discrete para estudiar la existencia de correlación en un marco estadístico-filogenético. Resultados. El análisis de las secuencias de los LTRs reveló la presencia de 7 posiciones polimórficas que podrían variar correlacionadamente con las presentaciones clínicas de la infección (AL/LP y LS). Es decir que la presencia de ciertas bases en determinadas posiciones del LTR podría asociarse con la correspondiente manifestación patogénica asociada a la infección. Los análisis basados en árboles-espejo indicaron que en las posiciones 41 y 56 del LTR dicha asociación es estadísticamente significativa (p<0.05, test Exacto de Fisher). El análisis de Máxima Verosimilitud (modo ML del programa Bayes Traits Discrete) indicó que, para las 7 posiciones analizadas, los datos se ajustan mejor a un modelo en el cual la forma clínica se correlaciona con la genética viral. Resultados similares se observaron mediante la utilización de simulaciones de Monte Carlo (modo MCMC del programa Bayes Traits Discrete): en todas las posiciones los datos se ajustan mejor al modelo dependiente o de correlación (LR > 0). Sin embargo, los valores de LR para todas las posiciones estudiadas no son concluyentes, ya que los valores de LR fueron menores que 2. Conclusión. Los resultados reportados en este trabajo sugieren que al menos dos posiciones de la región LTR (41 y 56) podrían estar implicadas en la determinación de la evolución clínica de los animales infectados por BLV. Estos hallazgos podrían contribuir al conocimiento respecto de las bases moleculares de la patogénesis para este virus. [less ▲]

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See detailDinámica de la excreción natural del Virus de la Leucosis Bovina en semen de toros infectados naturalmente
Rossich, L.; Gutiérrez, G.; Rodriguez, Sabrina ULg et al

Poster (2008, September 22)

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See detailDiversidad genética del Virus de la Leucemia Bovina: una aproximación filogenética
Rodriguez, Sabrina ULg; Trono, K.; Jones, L.R.

Poster (2008, September 22)

Diversidad genética del Virus de la Leucemia Bovina: una aproximación filogenética Sabrina M. Rodríguez1, Karina Trono1, Leandro R. Jones2 1 Instituto de Virología, CICVyA, INTA-Castelar. C.C. 77. C.P ... [more ▼]

Diversidad genética del Virus de la Leucemia Bovina: una aproximación filogenética Sabrina M. Rodríguez1, Karina Trono1, Leandro R. Jones2 1 Instituto de Virología, CICVyA, INTA-Castelar. C.C. 77. C.P. 1712. Castelar, Buenos Aires, Argentina. 2 Estación de Fotobiología Playa Unión. C.C. 15. C.P. 9103. Rawson, Chubut, Argentina. *E-mail: srodriguez@cnia.inta.gov.ar El virus de la leucemia bovina (BLV), agente etiológico de la Leucemia Bovina Enzoótica (LBE), pertenece al género Deltaretrovirus, dentro de la familia Retroviridae. En Argentina, la infección por BLV presenta niveles de seroprevalencia individual del 32,8% y del 84% a nivel predial. En trabajos anteriores, las cepas de BLV han sido clasificadas en dos grupos: uno Europeo y otro que incluye cepas de Japón y Estados Unidos (USA). En dos trabajos mas recientes se observo que la mayoría de las cepas argentinas se agrupan en un clado, mientras que una proporción minoritaria se agrupa con cepas de diverso origen. En uno de estos trabajos se propuso la existencia de cuatro genogrupos (Clusters I a IV), uno de los cuales (Cluster II) seria exclusivo de Argentina. Estas clasificaciones fueron propuestas en base a análisis realizados a partir de matrices de distancias obtenidas a partir de secuencias parciales (444/1547 pb.) del gen env. Las distancias fueron calculadas asumiendo el modelo evolutivo de Kimura con dos parámetros (K2P) y los árboles se obtuvieron mediante el algoritmo Neighbor-Joining (NJ). Actualmente, existen métodos específicos y objetivos para la selección de modelos evolutivos. Se ha demostrado que el uso de modelos arbitrarios puede conducir a resultados inesperados y erróneos. Por otro lado, el algoritmo NJ ha sido ampliamente superado por métodos más exhaustivos y modernos cómo Parsimonia y Máxima Verosimilitud. En este trabajo se caracterizaron 28 provirus argentinos mediante la secuenciación del gen env (1333/1547 pb.). Estas secuencias, junto con otras 42 secuencias seleccionadas de forma tal de abarcar toda la diversidad conocida y de incluir representantes de la mayor cantidad posible de locaciones geográficas, fueron analizadas mediante Parsimonia con el objeto de examinar las clasificaciones previas. Como outgroup (OG), se utilizaron secuencias homólogas de HTLV-1, HTLV-2, STLV-1 y STLV-2. Las secuencias fueron alineadas usando el programa Muscle 3.6. Los alineamientos fueron analizados con el programa TNT 1.1, mediante el cual se realizaron 1000 adiciones al azar (RAS) seguidas de Tree Bisection Reconection (TBR). La estimación del soporte de los grupos identificados se realizó mediante Symetric Jackniffing, utilizando el programa TNT. Nuestros resultados soportan la existencia del clado de secuencias de Japón y USA. Los árboles obtenidos en este trabajo no apoyan ni contradicen el grupo europeo, ya que el mismo podría estar presente en algunas de las posibles resoluciones del árbol sin raíz. Las secuencias de Argentina no se ubicaron en un único grupo sino que se mezclaron con cepas de diverso origen. Nuestros resultados no soportaron la hipótesis de que exista regionalización de las cepas de BLV, tal como se ha observado en HTLV. El árbol consenso de los árboles derivados del análisis incluyendo el outgroup, presentó una resolución relativamente baja con respecto al árbol consenso derivado del análisis sin raíz. Esto parece deberse a que las secuencias utilizadas como outgroup son extremadamente divergentes con respecto al ingroup, lo cual queda en evidencia luego de una simple inspección visual del correspondiente alineamiento. El resultado de esto es que muchas regiones de la matriz constituyen alineamientos al azar (es decir asignaciones de homología primaria incorrectas y aleatorias), con la consecuente pérdida de información. Esta última observación es de particular interés dado que HTLV y STLV han sido utilizados como OG en una gran cantidad de trabajos, lo cual está justificado ya que son los grupos conocidos más próximos a BLV. Nuestros análisis, sin embargo, sugieren fuertemente que es necesario identificar outgroups más adecuados para lograr una comprensión más acabada de la diversidad de estos virus. [less ▲]

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See detailEstandarización de un ensayo de PCR en tiempo real para la detección y cuantificación del Virus de la Leucosis Bovina en sangre y semen de toros seropositivos
Rossich, L.; González, F.; Gutiérrez, G. et al

Poster (2008, September 21)

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See detailFunctionalized plasmonic gold nanoparticles for optoacoustic cancer detection
Schol, Daureen ULg; Fleron, Maximilien ULg; Greisch, Jean-François et al

Poster (2008, September 12)

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See detailDIETRO L’IMMAGINE RIFLESSA DI UN’ADOLESCENTE.
Miscioscia, Marina ULg; Vaccaro, Maria Grazia; Zanini, Isabella

Poster (2008, September 12)

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See detailMAIN EXISTING IRRIGATION SYSTEMS IN THE SUB-BASINS OF THE TONLE SAP LAKE OF CAMBODIA
Ly, Sarann ULg; Someth, Paradis

Poster (2008, September 11)

The Tonle Sap Lake and its complex tributaries are the main water body and water courses of Cambodia. The catchment area of the lake is generally divided into twelve major sub-basins. The tributaries of ... [more ▼]

The Tonle Sap Lake and its complex tributaries are the main water body and water courses of Cambodia. The catchment area of the lake is generally divided into twelve major sub-basins. The tributaries of the lake have great potential of water resources for agricultural and industrial development. The river networks and existing irrigation projects are not well surveyed. A survey trip was conducted around the lake. The aim of this trip is to understand the river networks and identify main existing irrigation systems in the sub-basins of the Tonle Sap Lake. In this poster, we are mainly focused on the existing irrigation schemes. The schemes are classified into five categories. (1) “Surface runoff collector”: it is formed by a small dike to collect surface runoff from upstream part. The water collected is used as a supplementary water source for rainy season cultivation and for irrigating a small area of dry season cultivation. (2) “Dam reservoir”: a dam is put in place on a river to store the river runoff during the rainy season and the water stored is supplied to a command area in the dry season. (3) “Indirect diversion”: it is characterized by a diversion structure and a storage reservoir. Water is diverted and stored in the reservoir during the rainy season and used for dry season cultivation. (4) “Direct diversion”: characteristic of this type is similar to that of the indirect diversion, except the river water is diverted directly to irrigated area without storing in a reservoir. (5) “Flood storage”: it is generally developed in the floodplain of the Tonle Sap Lake. A ring dike prevents floodwater from entering the reservoir and rainy season rice is grown inside the dike. After harvesting, the gates on the ring dike are opened to receive floodwater. The water is stored inside the dike for cultivating dry season rice outside the dike. This study found that there are only small-scale irrigation schemes developed around/in the Tonle Sap Lake. The water resources of this lake have not been effectively used. [less ▲]

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See detailDifferent concepts of animal welfare and stakeholders arguments
Bartiaux-Thill, Nicole; Stassart, Pierre M ULg; Lamine, Claire et al

Poster (2008, September 11)

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See detailAbout the use of PCL/clay nanohybrid masterbatches
Benali, Samira; Brocorens, Patrick; Olivier, Aurore et al

Poster (2008, September 09)

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See detailMesoporous TiO2 thin films for photovoltaic applications
Dewalque, Jennifer ULg; Cloots, Rudi ULg; Mathis, François ULg et al

Poster (2008, September 08)

Thin films of nanocrystalline, mesostructured titanium dioxide are very promising materials to build low cost and efficient photovoltaic devices. TiO2 present a high chemical stability and electronic ... [more ▼]

Thin films of nanocrystalline, mesostructured titanium dioxide are very promising materials to build low cost and efficient photovoltaic devices. TiO2 present a high chemical stability and electronic properties such as photoinduced electronic transfer properties associated with the anatase phase. For many applications, highly porous nanostructured thin films with accessible pores are preferable to dense ones. Indeed, high accessible porosity leads to high surface area increasing the electron transfer area. [less ▲]

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See detailStudying the chemical activation in carbon xerogels
Zubizarreta, Leire; Arenillas, A.; Pis, J. J. et al

Poster (2008, September 08)

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See detailElectrochemical characterization of Pt/carbon xerogel and Pt/carbon aerogel catalysts
Job, Nathalie ULg; Maillard, F.; Marie, J. et al

Poster (2008, September 08)

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See detailExploration du réseau cérébral impliqué dans des jugements sur soi chez les personnes jeunes et âgées
Feyers, Dorothée ULg; Collette, Fabienne ULg; D'Argembeau, Arnaud ULg et al

Poster (2008, September 04)

Nous avons récemment observé que le cortex préfrontal ventro-médial (CPFVM) est activé à la fois chez des sujets jeunes et âgés dans une tâche de jugement d’adjectifs nécessitant d’évaluer sa propre ... [more ▼]

Nous avons récemment observé que le cortex préfrontal ventro-médial (CPFVM) est activé à la fois chez des sujets jeunes et âgés dans une tâche de jugement d’adjectifs nécessitant d’évaluer sa propre personnalité par rapport à celle d’un autre dans le contexte d’un prise de perspective à la première (1PP) et à la troisième (3PP) personne (Ruby et al., submitted). Nous avons poursuivi l’analyse de ces données par des analyses de connectivité fonctionnelle afin de déterminer le réseau des régions cérébrales associées à la performance des sujets jeunes et âgés. Les résultats montrent qu’en 1PP, l’activité du CPFVM est associée à celle du gyrus frontal inférieur et du gyrus parahippocampique chez les sujet âgés, mais uniquement à celle du cortex occipital chez les sujets jeunes. En 3PP, une connectivité fonctionnelle existe entre le CPFVM et le gyrus frontal médial, le gyrus frontal inférieur et les régions temporales supérieures chez les sujets âgées ; mais uniquement avec les régions occipitale et pariétale chez les sujets jeunes. Les régions cérébrales associées à l’activité du CPFVM chez les sujets jeunes ont été décrites comme impliquées dans la récupération en mémoire autobiographique ainsi que dans les processus de « mentalizing ». En ce qui concerne les personne âgées, le réseau cérébral découvert est relié à la récupération de souvenirs sémantique et épisodique (gyrus parahippocampique et temporal supérieur) mais aussi à l’attribution d’une valence émotionnelle à l’adjectif (gyrus frontal inférieur) et à la prise de perspective (gyrus frontal médial). Ces résultats indiquent (1) que le CPFVM est connecté à un réseau cérébral plus important chez les personnes âgées que chez les jeunes lors de jugement sur soi ; (2) que les sujets jeunes réalisent la tâche sur base d’informations autobiographiques seulement alors que les personnes âgées recrutent en plus des processus cognitifs de nature plus réflexive. [less ▲]

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See detailStudy of the hemispheric difference in observed NO2 trends
Kreher, K.; Liley, J.B.; Johnston, P.V. et al

Poster (2008, September)

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See detailLes dynamines MX et leur activité anti-influenza.
Garigliany, Mutien-Marie ULg; Zecchinon, Laurent; Cloquette, Karine et al

Poster (2008, September)

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See detailImpact of climatic conditions on a winter wheat (Triticum aestivum Sp.) crop : interannual variability of CO2 fluxes, plant growth and crop yield
Dufranne, Delphine ULg; Vancutsem, Françoise ULg; Moureaux, Christine ULg et al

Poster (2008, September)

This study analyses the interannual variability of carbon dioxide fluxes, growth and productivity of a winter wheat (Triticum aestivum L.) crop. Two growing seasons (2004-2005 and 2006-2007) were compared ... [more ▼]

This study analyses the interannual variability of carbon dioxide fluxes, growth and productivity of a winter wheat (Triticum aestivum L.) crop. Two growing seasons (2004-2005 and 2006-2007) were compared. Continuous eddy covariance fluxes, leaf scale photosynthesis measurements and crop development monitoring were performed during the two vegetation seasons until harvest at the Lonzée (Belgium) experimental site. The winter wheat was sown and harvested at similar dates (about mid-October and in early August); crop management by the farmer was similar and corresponded at standard. Globally, the two years were characterised by a higher than normal air temperature (9.9 °C and 11.9 °C against 9.4 °C) and lower than normal rainfalls (595.1 mm and 675.1 mm against 772 mm). In addition, 2006-2007 was characterised by exceptionally mild and dry winter and spring. This induced not only earlier growth stages but also a larger Gross Primary Productivity. On the contrary, lower Net Primary Productivity and crop productivity were observed on this year. This could be explained, on one hand by the drought in April 2007 and on the other hand to cloudy and humid conditions from end May to harvest. The first induced a stress in wheat plant which produced an unusually small flag leaf. The second induced an assimilation reduction due to low radiation and favoured disease development. The higher GPP and the lower productivity in 2006-2007 raise the question of carbon allocation. We supposed that, as the excess of carbon assimilated in 2006-2007 was not stored in grain or straw, it should have been stored in the roots. However, our biomass measurements did not allow confirming this hypothesis [less ▲]

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See detailQuantitative characterization of pore corrugation in SBA-15 mesoporous silica using image analysis of electron tomograms
Gommes, Cédric ULg; Friedrich, Heiner; Wolters, Mariska et al

Poster (2008, September)

Detailed reference viewed: 5 (1 ULg)
Peer Reviewed
See detailResponse of spider communities to habitat restoration in a wet heathland complex
Cristofoli, Sara ULg; Kekenbosch, Robert; Mahy, Grégory ULg

Poster (2008, September)

Detailed reference viewed: 16 (2 ULg)
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See detailSatellite validation of column-averaged methane on global scale: ground-based data from 15 FTIR stations versus last generation ENVISAT/SCIAMACHY retrievals
Sussmann, Ralf; Foster, Frank; Borsdorff, Tobias et al

Poster (2008, September)

Previous work has shown that the precision of ground-based mid-infrared (MIR) FTIR spectrometry is sufficient to detect day-to-day variability of columnar methane, while first retrievals from ENVISAT ... [more ▼]

Previous work has shown that the precision of ground-based mid-infrared (MIR) FTIR spectrometry is sufficient to detect day-to-day variability of columnar methane, while first retrievals from ENVISAT/SCIAMACHY (channel 8) satellite measurements were impacted by a significant time-dependent bias due to detector icing. This prevented insight into true methane temporal variability at that time. The goal of our updated study is to investigate the precision of the last generation (channel 6) SCIAMACHY retrievals IMAP-DOAS v49 and WFM-DOAS v1.0 in comparison to retrievals from ground-based MIR measurements of the European FTIR network. We first briefly discuss the origin and magnitude of the natural variability of columnar methane. Subsequently, our study investigates all factors which can be optimized to improve precision of ground-based MIR-FTIR retrievals of columnar methane. This includes an optimized Tikhonov-type regularization tuned in a way to minimize the diurnal variability of retrieved columnar methane. We also discuss ways to select and average individual-pixel satellite data in order to reflect true day-to-day variability and make them comparable to ground-based data. [less ▲]

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See detailEffect of pre-emptive Vagus Nerve Stimulation on cortical spreading depression in rat
Multon, Sylvie ULg; Prodanov, D.; Chauvel, Virginie ULg et al

Poster (2008, September)

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See detailValidation of SCIAMACHY CH4 scientific products using ground-based FTIR measurements
Dils, Bart; De Mazière, Martine; Vigouroux, Corinne et al

Poster (2008, September)

In the framework of the past EVERGREEN project, the development of three scientific algorithms, namely WFM-DOAS (henceforward called WFMD), IMAP-DOAS (henceforward called IMAP) and IMLM, commenced in ... [more ▼]

In the framework of the past EVERGREEN project, the development of three scientific algorithms, namely WFM-DOAS (henceforward called WFMD), IMAP-DOAS (henceforward called IMAP) and IMLM, commenced in order to retrieve the total column amounts of key atmospheric trace gases, including CH4, from SCIAMACHY nadir observations in its near-infrared channels. Since then, the retrieval products of these three algorithms, have undergone serious improvements. At key phases in their development, the products have been validated by using a network of ground-based FTIR instruments. Parallel with the improved SCIAMACHY data, the FTIR groups have taken steps to optimise and harmonise their own datasets and as such the different validation efforts always used the state-of-the-art FTIR dataset. Here we present an overview of the evolution of the CH4 algorithms by re-validating the data, using the same FTIR dataset (as developed under the UFTIR project) for all algorithm versions. [less ▲]

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See detailDistribution d’adhésines potentielles au sein de souches d’Escherichia coli entérohémorragiques de sérogroupes O26
Bardiau, Marjorie ULg; Labrozzo, Sabrina; Mainil, Jacques

Poster (2008, September)

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See detailNi/SiO2 Catalyst Preparation Studies using SBA-15 as a Model Support and quantitative Electron Tomography Characterisation
de Jongh, Petra; Friedrich, Heiner; Gommes, Cédric ULg et al

Poster (2008, September)

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See detailAn FLC-like gene is controlled by vernalization in root chicory
Périlleux, Claire ULg; Pieltain, Alexandra ULg; D'Aloia, Maria ULg et al

Poster (2008, September)

Vernalization is known to promote flowering in Arabidopsis via the repression by cold of the floral inhibitor gene FLOWERING LOCUS C (FLC). For long, FLC homologs have been found in Brassicaceae only but ... [more ▼]

Vernalization is known to promote flowering in Arabidopsis via the repression by cold of the floral inhibitor gene FLOWERING LOCUS C (FLC). For long, FLC homologs have been found in Brassicaceae only but it was recently reported that in sugar beet, the FLC-like gene BvFL1 functions as a repressor of flowering and is downregulated in response to cold. We describe here the cloning of CiFL1 from root chicory (Cichorium intybus). Expression patterns were studied in two cultivars, differing in their sensitivity to vernalization. Transcript level analyzes were performed during the vernalization treatment of the seedlings and in different post-vernalization conditions. Our results give further support to conservation of the biological function of FLC-like genes in eudicot species. [less ▲]

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See detailMeasuring Time Delays in Gravitational Lenses
Eulaers, Eva ULg; Magain, Pierre ULg; Sohy, Sandrine ULg et al

Poster (2008, September)

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See detailPore size distribution of baker’s yeast evaluation using x-ray micro-tomography
Debaste, Frédéric; Léonard, Angélique ULg; Halloin, Véronique et al

Poster (2008, September)

Detailed reference viewed: 16 (3 ULg)
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See detailProduction of adsorbent materials from dried residual sludges
Fostroy, Philippe; Salmon, Thierry ULg; Crine, Michel ULg et al

Poster (2008, September)

Detailed reference viewed: 30 (5 ULg)
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See detailLife and Motion Configuration
Hallot, Pierre ULg; Billen, Roland ULg

Poster (2008, September)

Detailed reference viewed: 60 (25 ULg)
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See detailRoof storage systems: Modelling and performance’s comparison
Beckers, Eléonore ULg; Degre, Aurore ULg

Poster (2008, September)

Rainwater runoff problems have become critical in large cities because of the increasing imperviousness of surfaces. Best practices to manage urban runoff improve water infiltration and evaporation ... [more ▼]

Rainwater runoff problems have become critical in large cities because of the increasing imperviousness of surfaces. Best practices to manage urban runoff improve water infiltration and evaporation through green areas establishment and, therefore, natural hydrological cycle restoration. The aim is to evaluate rainwater runoff from different types of roof storage systems and to conclude about their own interests to manage urban runoff production. [less ▲]

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See detailHow to make Natura 2000 work properly? : Socio-economic, legal & ecological management
Grogna, Valérie; Mahy, Marie; Meuris, Steve et al

Poster (2008, September)

In Belgium, the delineation of Special Protection Areas (SPA) and Special Areas of Conservation (SAC) has been done. At present many questions arise concerning the management of these areas. The multiple ... [more ▼]

In Belgium, the delineation of Special Protection Areas (SPA) and Special Areas of Conservation (SAC) has been done. At present many questions arise concerning the management of these areas. The multiple use of the space generates conflicts of interest. The SELNAT-project aims to answer the question “How to make Natura 2000 work properly?”, taking into account socio-economic, legal and ecological management aspects. This project aims to achieve more insight in a sustainable management of Natura 2000 sites. In a first part of the study, the legal framework, the ecological status and the socio-economic frame have been described. The main legal, economic, social and ecological bottlenecks for the Natura 2000 network implementation in Belgium have been highlighted. In a next phase, guidelines for the elaboration of a ‘good management plan’ for the Natura 2000 network will be developed at the local scale taking into account the principles of the Ecosystem approach.. The fundamental question in this part is which instruments are needed at what time in the implementation process to reach the ecological targets taking into account economic, legal and social considerations. In a first step we evaluated the feasibility and effectiveness of these instruments by means of a literature review and a survey among experts of the field. In a second step we’ll try to develop a management plan for two case study areas, a Flemish site and a Walloon site. A the end of the project, recommendations for policy makers about the improvement of these instruments will be formulated. [less ▲]

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See detailThe examination of illusory recollection reveals that rates of true recollection are often overestimated
Dehon, Hedwige ULg; Lampinen, James Michael

Poster (2008, September)

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See detailCOcaine in WATer
Theunis, Laetitia ULg; Dubois, Nathalie ULg; Van Nuijs, Alexander et al

Poster (2008, September)

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See detailWhich sturgeon species should be reintroduce in the Rhône River ?
Chassaing, Olivier; Desse-Berset, Nathalie; Pagès, Marie ULg et al

Poster (2008, September)

Sturgeons were common in Western Europe until the 19th century, spawning in every important river from the Baltic Sea to the Black Sea. A population of sturgeons was present in the Rhone River (southern ... [more ▼]

Sturgeons were common in Western Europe until the 19th century, spawning in every important river from the Baltic Sea to the Black Sea. A population of sturgeons was present in the Rhone River (southern France) until the 1970’s. This population disappeared without having been characterized genetically. Two species were present in western Mediterranean: Acipenser sturio, ubiquitous along European coasts, and Acipenser naccarii, in Adriatic Sea and western Mediterranean; so the question of their sympatry in the Rhône River remains open. Nowadays, only one population of A. sturio remains in the Gironde estuary and two populations of A. naccarii in the Po (Italy) and Buna (Albany) basins. We studied archaeological remains from the Rhône River bank (Jardin d’Hiver), near Arles (France), where around 2 500 sturgeons bones, dated from the 2nd to the 6th century BC, have been excavated. It represents a unique opportunity to study a Mediterranean population of sturgeons long before its decline. Morphometric studies have already been carried out on these remains and only the species A. sturio has been identified (Desse-Berset, 1994). We completed this first investigation by genetics analyses on some archaeological bones, which allowed to confirm the presence of A. sturio in the Rhône River some 2500 years ago (Pagès, 2008). A larger study on archaeological remains is now undertaken to confirm the absence of A. naccarii in the Rhône River. Museum specimens from the Rhône River, which are not older than 200 years old, are also under analysis. Our aim is to compare the genetic diversity of the Rhône River sturgeon population through time, in order to estimate the impact of human activities. Data acquired will be useful for conservation efforts and particularly for a possible reintroduction of sturgeons in the Rhone River. [less ▲]

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See detailNorovirus and sapovirus in pigs in Belgium
Mauroy, Axel ULg; Scipioni, Alexandra; Mathijs, Elisabeth et al

Poster (2008, September)

Noroviruses and sapoviruses belong to the norovirus and sapovirus genera respectively in the family Caliciviridae. These positive single stranded RNA viruses are known as common gastroenteritis agents in ... [more ▼]

Noroviruses and sapoviruses belong to the norovirus and sapovirus genera respectively in the family Caliciviridae. These positive single stranded RNA viruses are known as common gastroenteritis agents in human and have been also identified in other species like swine (1). Porcine noroviruses and sapoviruses have been to date poorly detected in European countries. Porcine sapovirus have been only reported in 2 European countries, namely Hungary and Italy (2; 3) and porcine norovirus sequences were detected in The Netherlands (4). In this study, both porcine noroviruses and sapoviruses were detected in swine stools showing their circulation in Belgian premises. Seven samples gave positive amplicons. Using BLAST and phylogenetic analysis, two porcine norovirus strains were identified and are genetically related to genotype 19 strains. Five samples contained porcine sapoviruses and are genetically related to the Porcine Enteric Calicivirus Cowden and newly described porcine strains. Sapovirus sequences were mainly detected in stool of piglets (less than 8 weeks old). Only one sequence was detected in an older pig (16-20 weeks). Norovirus sequences were detected in stools of fattening pigs (16-20 weeks). Neither sapovirus nor norovirus detected sequences could be associated with clinical signs of gastroenteritis. In conclusion, the circulation of both porcine sapovirus and norovirus was shown in Belgium, extending their European distribution. Given uncertainties on the zoonotic risk, countries where swine and humans are relatively closed should develop surveillance programs where both human and animal calicivirus strains are screened in gastroenteritis outbreaks, wastewaters and veterinary diagnostic samples. [less ▲]

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See detailAdaptation of a soil heterotrophic respiration model to an agricultural soil.
Buysse, Pauline ULg; Le Dantec, Valérie; Sagnier, Charlotte et al

Poster (2008, September)

This work aimed at adapting a model of soil heterotrophic respiration to an agricultural soil situated in the Hesbaye region (Belgium) and cultivated with a sugar beet / winter wheat / potato/ winter ... [more ▼]

This work aimed at adapting a model of soil heterotrophic respiration to an agricultural soil situated in the Hesbaye region (Belgium) and cultivated with a sugar beet / winter wheat / potato/ winter wheat rotation. This model would be integrated as a sub routine in a larger model describing soil respiration and soil carbon content evolution in crops and that will include autotrophic respiration and CO2 diffusion in soil. The present model is run at a daily time step and at the ecosystem spatial scale and is derived from the CENTURY model. Model parameterisation was performed on the basis of literature survey and of data collected at the Carboeurope agricultural site of Lonzée. Soil characteristics were determined on the basis of analyses performed on loamy soils, typical of the Hesbaye region. Driving variables (meteorological variables and litter input) were obtained during a 4 year measurement campaign performed at the Lonzée experimental site. Biochemical parameters for wheat, potato and sugar beet crops were collected from literature. However, a large parameter variability was noticed as well as a lack of information concerning sugar beet and potato. A sensitivity analysis was performed in order to classify the different parameters in terms of their impact on the respiration rate and carbon contents of each pool. It showed that the most important parameters were those controlling the temperature response, the litter input and its nitrogen and lignin content. The sensitivity analysis also showed differences in parameter impact between short and long term, notably because of pool stabilisation dynamics and crop residue types. This analysis allowed defining the further experiments that need to be developed in order to improve model adjustment on experimental data. [less ▲]

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See detailA new approach to analyze genotypes of colony-forming cyanobacteria from environmental samples.
Lara, Yannick ULg; BOUTTE, Christophe; PERETYATKO, Anatoly et al

Poster (2008, August 31)

Several studies have shown the efficiency of sequences as rRNA-ITS, cpcBA, rbcLX and other housekeeping genes to study taxonomy [1, 2, 3], population, community structure of cyanobacteria, or for Multi ... [more ▼]

Several studies have shown the efficiency of sequences as rRNA-ITS, cpcBA, rbcLX and other housekeeping genes to study taxonomy [1, 2, 3], population, community structure of cyanobacteria, or for Multi Locus Sequence Analysis [4]. Recently, the genotypic analysis of single colonies and single filaments directly isolated from the environment has been carried out by other authors. It appears that different genotypes of Microcystis are present in one population in one lake. Besides, succession of toxic and non-toxic genotypes may have a critical influence on toxin concentrations during the blooms [5]. Genotypic analysis of colony-forming cyanobacteria requires enough DNA. So far, the genotypes of environmental single colonies of Microcystis were characterized on the basis of one or two PCR [6]. As the DNA content of one single colony only allows for a few PCR reactions, we have developed a new approach using Whole Genome Amplification with Phi29 polymerase to allow for the Multi Locus Sequences Typing analysis of a single colony or filament. For the first time, we were able to amplify and sequence more than one locus of the genome of a single colony of Microcystis. In addition, we have obtained the first sequences of rpoC1, rbcLX and rRNA-ITS from a single colony of the genus Woronichinia ( identified by microscopy). This approach allows to work with a small amount of DNA, and represents a concrete answer to the lack of data on non-cultivable cyanobacteria. This research is supported by the Belgian Science policy under the science for a sustainable development (SSD) and Fonds de la Recherche Scientifique-FNRS with a FRIA fellowship. References: [1] Otsuka S, et al (1999) FEMS Microbiology Letters 172 15-21 [2] Gugger M, et al (2002) Int J Syst Evol Microbiol 52 1867-1880 [3] Haverkamp T, et al (2008) Environmental Microbiology 10(1) 174-188 [4] Lodders N, et al (2005) Environmental Microbiology 7 (3) 434-442 [5] Kardinaal E, and Visser P (2005) In Harmfuf cyanobacteria, Springer Dordrecht pp 41-64 [6] Janse I, et al (2004) Appl Environm Microbiol 70 (7) 3979–3987 [less ▲]

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See detailCyanobacterial diversity in the Transantarctic Mountains (Antarctica).
Fernandez Carazo, Rafael ULg; Hodgson, Dominic; Wilmotte, Annick

Poster (2008, August 31)

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See detailFossil cyanobacterial sequences in Antarctic lake sediments
Fernandez Carazo, Rafael ULg; Hodgson, Dominique; Wilmotte, Annick

Poster (2008, August 31)

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See detailServices and Consumer Communities
Toussirot, Muriel ULg; Van Riel, Allard ULg

Poster (2008, August 25)

Detailed reference viewed: 37 (14 ULg)
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See detailCoccolithophore bloom dynamics shape bacterioplankton communities in the northern Bay of Biscay
Van Oostende, Nicolas; Vyverman, Wim; Harlay, Jérôme ULg et al

Poster (2008, August 17)

Coccolithophores (Prymnesiophyceae) such as Emiliania huxleyi belong to the most productive calcifying organisms in the oceans. During two consecutive years we assessed bacterial diversity and dynamics ... [more ▼]

Coccolithophores (Prymnesiophyceae) such as Emiliania huxleyi belong to the most productive calcifying organisms in the oceans. During two consecutive years we assessed bacterial diversity and dynamics during the course of spring phytoplankton blooms dominated by coccolithophores in the northern part of the Bay of Biscay. Bacterioplankton community composition was assessed by means of denaturing gradient gel electrophoresis (DGGE) in combination with 16S rRNA gene clone libraries. We used ordination analysis to relate bacterioplankton community dynamics to phytoplankton pigment data and environmental parameters (nutrient concentrations, total alkalinity, concentration of transparent exopolymeric particles (TEP), pCO2). We found a clear difference in composition between the free-living and the particle-associated bacterial assemblage, with the identified Flavobacteria and Sphingobacteria phylotypes being characteristic for the particle-associated bacterial assemblage and Alfaproteobacteria and members of the SAR86 cluster dominating the free-living bacterial assemblage. Stations along the continental margin, at different stages in the coccolithophore bloom, were characterized by distinct bacterial assemblages which correlated well with changes in phytoplankton community composition and TEP abundance. We hypothesize that coccolithophore bloom dynamics shape both the free-living and the particle associated bacterial assemblages through phytoplankton group-specific associations and TEP production [less ▲]

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See detailAntecedents of Team Learning in New Product Development Teams
Ennabih, Abdessamad ULg; Van Riel, Allard ULg; Sasovova, Z.

Poster (2008, August 08)

Detailed reference viewed: 118 (2 ULg)
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See detailImplication of tilted peptides in viral fusion
Lins, Laurence ULg; Brasseur, Robert ULg

Poster (2008, August)

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See detailImpact of different spectroscopic datasets on CH4 retrievals from Jungfraujoch FTIR spectra
Duchatelet, Pierre ULg; Mahieu, Emmanuel ULg; Demoulin, Philippe ULg et al

Poster (2008, August)

Methane (CH4) is released in the atmosphere by natural processes (e.g. wetlands, termites) as well as by anthropogenic activities (e.g. fossil fuel exploitation, rice agriculture, biomass burning, etc ... [more ▼]

Methane (CH4) is released in the atmosphere by natural processes (e.g. wetlands, termites) as well as by anthropogenic activities (e.g. fossil fuel exploitation, rice agriculture, biomass burning, etc). Due to its high warming potential and its relatively long chemical lifetime (~9 years), atmospheric methane plays a major role in the radiative forcing responsible of the greenhouse effect. Methane also affects climate by influencing tropospheric ozone and stratospheric water. The cycle of methane is complex and to understand it requires a complete study of its emissions and its budget of sources and sinks. High quality methane data sets are needed to perform such studies. CH4 vertical distributions as well as total and partial column time series can be retrieved from high-resolution ground-based FTIR spectra, using, e.g., the SFIT-2 algorithm which implements the Optimal Estimation Method of Rodgers. A set of 5 microwindows - located in the 2 to 5.5 µm range and jointly adopted by all partners involved in the European HYMN project (www.knmi.nl/samenw/hymn/) - are fitted simultaneously during the retrieval procedure. Although this approach provides relatively high information content, CH4 retrieved profiles very often present large oscillations in the troposphere, which might result partly from inappropriate or inconsistent spectroscopic parameters. Significant improvements on retrieval quality could be reached by using more accurate CH4 spectroscopic parameters. This contribution compares 3 different sets of CH4 spectroscopic parameters (including HITRAN 2004 and 2 versions where HITRAN 2004 have been updated by recent laboratory measurements), which have been tested using one year of high resolution FTIR solar observations performed at the International Scientific Station of the Jungfraujoch (Swiss Alps, 46.5°N, 8.0 °E, 3580m a.s.l.). The impact of these different spectroscopic datasets on retrieved CH4 partial columns and vertical profiles, as well as on the fitting quality (residuals) and on the error budget characterizing our CH4 products will be evaluated and discussed. [less ▲]

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See detailMesoporous TiO2 thin films for photovoltaic applications
Dewalque, Jennifer ULg; Mathieu, Xavier; Decroly, André et al

Poster (2008, August)

Thin films of nanocrystalline, mesostructured titanium dioxide are very promising materials to build low cost and efficient photovoltaic devices. TiO2 present a high chemical stability and electronic ... [more ▼]

Thin films of nanocrystalline, mesostructured titanium dioxide are very promising materials to build low cost and efficient photovoltaic devices. TiO2 present a high chemical stability and electronic properties such as photo-induced electronic transfer properties associated with the anatase phase. For many applications, highly porous nanostructured thin films with accessible pores are preferable to dense ones. Indeed, high accessible porosity leads to high surface area increasing the electron transfer surface. [less ▲]

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See detailEvaluation de l’impact des propriétés tensioactives et d’hydrophobicité de surface sur le transfert gaz-liquide au sein d’un réacteur biphasique et son extrapolation
Gillet, Sébastien ULg

Poster (2008, August)

L’objectif du travail était d’une part d’évaluer la faisabilité d’une extrapolation du système et d’autre part de mieux comprendre l’impact des constituants de ce système biphasique sur le transfert de ... [more ▼]

L’objectif du travail était d’une part d’évaluer la faisabilité d’une extrapolation du système et d’autre part de mieux comprendre l’impact des constituants de ce système biphasique sur le transfert de masse gaz-liquide.En proposant une méthode d’estimation en continu de la stabilité de l’émulsion biphasique, ce travail permet de conclure à la possibilité d’un passage à une échelle plus grande.Pour mieux comprendre l’impact de la biomasse et du surfactant sur les mécanismes impliqués dans le transfert, une approche basée sur trois types de mesures est proposée. Cette approche, simple dans sa mise en oeuvre, présente l’avantage de se baser sur des mesures réelles, permettant de prendre en compte certains facteurs ignorés par les modèles mathématiques fournis dans la littérature. Le travail met en évidence une diminution du “ kLa ” au cours de la “ vie ” d’un réacteur biphasique. De plus, les mécanismes responsables de cette diminution ont également pu être identifiés. [less ▲]

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See detailExploiting Biology Specific Properties for the Estimation of Kinetic Parameters
Fey, D.; Bullinger, Eric ULg

Poster (2008, August)

Detailed reference viewed: 4 (0 ULg)
Peer Reviewed
See detail1H NMR metabolomic approach of the laser-induced choroidal neovascularization in mice
Lambert, Vincent ULg; Frederich, Michel ULg; Rousseau, Rousseau et al

Poster (2008, August)

Detailed reference viewed: 64 (33 ULg)
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See detailSmall scale variations in the microbenthic loop of Posidonia oceanica meadows: an experimental interpolation design.
Pete, Dorothée ULg; Lenartz, Fabian ULg; Velimirov, Branko et al

Poster (2008, August)

In the sediment compartment of Posidonia oceanica meadows, there is a severe lack of information on small scale variations. In an attempt to understand spatial variations of the microbenthic loop ... [more ▼]

In the sediment compartment of Posidonia oceanica meadows, there is a severe lack of information on small scale variations. In an attempt to understand spatial variations of the microbenthic loop (bacteria, organic matter, microphytobenthos and meiofauna), an experiment based on interpolation methods was led in Calvi Bay (Corsica, France), in March 2008, at 10 m depth. Twelve points were sampled randomly in a 125 x 125 cm square, divided into twenty-five 25 x 25 cm squares, to assess and describe the spatial distribution and variations of different parameters of the sediment. Those parameters are granulometry, density of P. oceanica, concentration in nutrients in the pore water, bacteria (biomass, abundance, morphotypes), organic matter (biomass), microphytobenthos (biomass), roots and rhizomes (biomass) and meiofauna (biomass). Results and distribution maps of the respective sediment parameters will be presented for the first time. [less ▲]

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See detail3D finite‐element modeling for the magnetization of bulk high‐Tc drilled superconductors
Lousberg, Grégory ULg

Poster (2008, August)

Article associé : Numerical simulation of the magnetization of high-temperature superconductors: a 3D finite element method using a single time-step iteration

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See detailDry heathlands and sandy open grasslands in a suburban environment in the south of Brussels (Belgium) : Assessment of the conservation status
Taymans, Julien ULg; Mahy, Grégory ULg

Poster (2008, August)

The Brabant sablo-limoneux region is located in the south and near Brussels, in the phytogeographic district of Brabant (Atlantic domain). This region is characterized by a high diversity of local ... [more ▼]

The Brabant sablo-limoneux region is located in the south and near Brussels, in the phytogeographic district of Brabant (Atlantic domain). This region is characterized by a high diversity of local ecological conditions due to the alternance of important tertiary sand outcrops and quaternary silty layers. The agro-sylvo-pastoral activities, which were practiced on these sandy and sand-silty soils for centuries, caused the evolution of the climactic forest into semi-natural habitats such as dry heathland, sandy grassland and grassheath. The evolution of the heathland distribution from 1770 to the present has been studied on the scale of the Dyle hydrographic subbasin (43.000 ha). It is characterized by an important regression of this habitat in the study area (from 1460 ha in 1770 to 72 ha in 2006), mainly due to Pinus sylvestris orchards, and more recently, to urbanisation caused by the proximity of Brussels. A generalized ageing and an environmental closing characterize the evolution of heathland physiognomy since the middle of the 20th century. The phytosociology of heathlands, sandy grasslands and grassheaths has been characterized and 19 groups of vegetation have been differentiated. Among the 393 listed higher plant species, more than 30 are of great conservation interest in the regional context. A hierarchisation of restoration priorities has been established on the scale of the studied hydrographic subbasin and management measures have been proposed. [less ▲]

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See detailDifferential isotopic turnover (C and N) detected in Antarctic scavenger amphipods
Nyssen, Fabienne ULg; Michel, Loïc ULg; Dauby, Patrick ULg et al

Poster (2008, August)

Metabolic activity is positively related to temperature, inversely to body mass and is a function of taxon specific life style features, in particular activity such as level of active movement. Therefore ... [more ▼]

Metabolic activity is positively related to temperature, inversely to body mass and is a function of taxon specific life style features, in particular activity such as level of active movement. Therefore, the isotope signal transfer velocity is expected to be lower in cold environments and in larger as well as less active organisms. Our study explores whether this may be a problem in trophic studies of a comparatively “slow” because cold system such as the high Antarctic shelf ecosystem and in comparatively large organisms such as benthic amphipod species within this system. We compare experimentally the velocity of stable isotope signal transfer from prey to consumer in three lysianassoid amphipods, Waldeckia obesa, Abyssorchomene plebs and Pseudorchomene coatsi. They have similar alimentation, but different size and lifestyle. Indeed, W. obesa is a very sedentary species spending most of the time immobilized on diverse substrates whereas P. coatsi is very motile, swimming rapidly around the aquarium. The third species, A. plebs has an intermediate behaviour, sharing time between short swim and resting on bottom. Those species also differ significantly in size: and are good representative of scavenger trophic guild on Antarctic shelf. After being starved, amphipods were kept by species and fed ad libitum with lyophilized fish during fifty days. Individuals were sacrificed weekly for isotopic analysis. At the end of the 7-week incubation with standardized food, rank correlation of δ13C and δ15N against time did not show any consistent trend for A. plebs (δ13C: p = 0.51 and δ15N p = 0.04) neither for the species W. obesa (δ13C: p = 0.77 and δ15N p = 0.26). By contrast, for P. coatsi, rank correlations were highly significant (p < 0.0001). The linear regression illustrated a clear increase of isotopic ratios all along the experiment. This metabolic discrepancy between species is probably a size-mass effect. Furthermore, for this species, ANCOVA of the individually measured isotopic ratios first transformed to an offset value (rate vs carbon ↔ nitrogen, covariate time) provided evidence for significant effects of the parameter “isotope” on isotopic temporal evolution. Indeed, the δ13C values evolve much faster than the δ15N ones. According to data, it would take double time for P. coatsi to balance its nitrogen isotopic signature than its carbon isotopic ratio when changing food. Those results are critically discussed. [less ▲]

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See detailA mathematical modelling of bloom of the coccolithophore Emiliania huxleyi in a mesocosm experiment
Joassin, Pascal ULg; Delille, Bruno ULg; Soetaert, Karline et al

Poster (2008, July 23)

A dynamic model has been developed to represent biogeochemical variables and processes observed during a bloom of Emiliania huxleyi coccolithophore. This bloom was induced in a mesocosm experiment during ... [more ▼]

A dynamic model has been developed to represent biogeochemical variables and processes observed during a bloom of Emiliania huxleyi coccolithophore. This bloom was induced in a mesocosm experiment during which the ecosystem development was followed over a period of 23-days through changes in various biogeochemical parameters such as inorganic nutrients (nitrate, ammonium and phosphate), total alkalinity (TA), dissolved inorganic carbon (DIC), partial pressure of carbon dioxide (pCO2), dissolved oxygen (O2), photosynthetic pigments, particulate organic carbon (POC), dissolved organic carbon (DOC), Transparent Exopolymer Particles (TEP), primary production, and calcification. This dynamic model is based on unbalanced algal growth and balanced bacterial growth. In order to adequately reproduce the observations, the model includes an explicit description of phosphorus cycling, calcification, TEP production and an enhanced mortality due to viral lysis. The model represented carbon, nitrogen and phosphorus fluxes observed in the mesocosms. Modelled profiles of algal biomass and final concentrations of DIC and nutrients are in agreement with the experimental observations. [less ▲]

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