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See detailEcological thresholds and estimates of breaking points in newt populations: a useful tool to categorise habitat use and apply conservation measures
Denoël, Mathieu ULg; Ficetola, Gentile

Poster (2007)

Ecological thresholds are defined as points at which a rapid change occurs from one ecological condition to another. Their determination in species–habitat relationships has important implications because ... [more ▼]

Ecological thresholds are defined as points at which a rapid change occurs from one ecological condition to another. Their determination in species–habitat relationships has important implications because they allow to understand ecological requirements of species and to provide efficient conservation measures. However, there is a lack of concordance across studies and this method was not yet applied to newts. In this study, we sampled 371 ponds to gather occurrence data on the palmate newt Triturus heveticus and the Alpine newt Triturus alpestris. We tested for the existence of significant thresholds for three variables: distance to forest, forest and crop covers. We found significant thresholds for both landscape configuration and composition, with relationships between distance to forest and occurrence of Triturus alpestris and T. helveticus, and forest and crop cover and T. helveticus. Both species require breeding ponds within a given distance from the forest, but T. helveticus is more dependent on forest availability than T. alpestris: its ecological threshold is located at lower distance from forest edge, and requires also higher values of forest cover. Crops have a negative influence on palmate newt distribution with a significant breaking point, but not for T. alpestris in the studied area. These results indicate that thresholds can be a useful concept from which tools may be developed. They are particularly pertinent to focus conservation effort for threatened species and their habitats as quantitative measures of the most required habitats for species can be obtained from statistically determined breaking points [less ▲]

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See detailSox 10 is not necessary for auditory neurons survival
Breuskin, I; Bodson, M; Thelen, Nicolas ULg et al

Poster (2007)

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See detailSuccessful therapy of verrucous carcinoma by photodynamic therapy
NIKKELS, Arjen ULg; thirion, L.; QUATRESOOZ, Pascale ULg et al

Poster (2007)

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See detailRelationship between human tumor-associated antigen RCAS1 and gestational diabetes mellitus
Tskitishvili, Ekaterine ULg; Komoto, Yoshiko; Kinugasa, Yukiko et al

Poster (2007)

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See detailSemi-separative isolation of Fn-type inulin from hydrolised globe artichoke inulin.
Ronkart, Sébastien; Blecker, Christophe ULg; Fourmanoir, Hélène et al

Poster (2007)

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See detailGlobal morphology of substorm growth phases observed by the IMAGE-SI12 imager
Blockx, Caroline ULg; Gérard, Jean-Claude ULg; Coumans, Valérie ULg et al

Poster (2007)

Growth phases are observed to start from less than 30 minutes to over an hour before the substorm onset. The sector of maximum proton precipitation during the growth phase is generally located around 2200 ... [more ▼]

Growth phases are observed to start from less than 30 minutes to over an hour before the substorm onset. The sector of maximum proton precipitation during the growth phase is generally located around 2200 MLT. It rapidly moves in local time by about 1.2 hour toward midnight at the time of the onset. The open magnetic flux increases by as much as a 33% during the growth phase. The mean value of the open flux at the end of the growth phase, immediately preceding the substorm, onset is about 0.74. GWb for substorms triggered by external (solar wind) factors and 0.67 GWb for non-triggered substorms. The open magnetic flux generally drops following the onset of triggered substorms but continues to increase for non-triggered events. We interpret this behavior as an indication that the rate of opening of closed field lines on the dayside can exceed that of the nightside reconnection after the onset in non-triggered substorms. By contrast, flux closure is more efficient while the flux opening rate drops in the case of externally triggered onset, so that the closure rate exceeds that of field line opening on the dayside. The rate of equatorward displacement is typically ~ 3 deg/hour. It is statistically correlated with the magnitude of the southward Bz component of the IMF measured by the ACE satellite. It is also correlated with transfer functions describing the efficiency of solar wind energy transfer which involve the transverse electric field carried by the solar wind. The equatorward motion may be global, restricted to local time sectors or a combination of both. No nightside local time sector appears favored where the motion of the equatorial boundary would be more pronounced. The maximum displacement of the polar boundary is statistically located around midnight MLT. [less ▲]

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See detailThe effect of hypothermia on neonatal stem cells
Kanagawa, Takeshi; Tomimatsu, Takuji; Mimura, Kazuya et al

Poster (2007)

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See detailSIZE DISTRIBUTION OF METALLIC POWDERS : A COMPARISON OF DIGITAL IMAGING AND LASER DIFFRACTION
Gregoire, Max; Michel, Frédéric ULg; Campana, Florent et al

Poster (2007)

Automated image analysis of particles under controlled orientation (SIA) is becoming a challenging technique for laser diffraction (LD) in the field of sizing metallic particles above 5 μm. Thanks to ... [more ▼]

Automated image analysis of particles under controlled orientation (SIA) is becoming a challenging technique for laser diffraction (LD) in the field of sizing metallic particles above 5 μm. Thanks to optimal particle dispersion and fully automated microscopic imaging, it is now possible to gather individual measurements on thousands of particles within a minute. The aim of this paper is to compare results obtained with both image analysis and laser diffraction from a selection of powders (figure 1) in the range between 5 μm and 250 μm. [less ▲]

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See detailSpatial dynamics of rRNAs within the cell nucleus
Thiry, Marc ULg; Lamaye, Françoise; Thelen, Nicolas ULg et al

Poster (2007)

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See detailNumerical modelling of coupled mechanics and gas transfer
Gerard, Pierre ULg; Charlier, Robert ULg; Barnichon, Jean-Dominique et al

Poster (2007)

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See detailEnrichment of anhydrous milk fat in polyunsatured fatty acid residues from linseed and rapeseed oil through enzymatic interesterification
Aguedo, Mario ULg; Hanon, Emilien ULg; Danthine, Sabine ULg et al

Poster (2007)

The interesterification, or ester exchange, between two fats leads to the rearrangement of acyl moieties in both. The use of a sn-1,3-specific lipase confines the exchange of fatty acid residues to the sn ... [more ▼]

The interesterification, or ester exchange, between two fats leads to the rearrangement of acyl moieties in both. The use of a sn-1,3-specific lipase confines the exchange of fatty acid residues to the sn-1 and sn-3 positions of triacylglycerides (TAG), generating products with characteristics that cannot be obtained through a chemical process or a blending. Such reactions require mild conditions with no solvent needed and they yield no unhealthful trans fatty acids, justifying the stepped-up interest of enzymatic interesterification for the production of margarines and other food fats. The aim of this work was to use enzymatic interesterification to enrich anhydrous milk fat (AMF) with unsaturated fatty acid C18 residues from linseed oil (LO) and eventually from rapeseed oil (RO) through some binary blends and one ternary blend. For that, the 1,3-specific lipase from Thermomyces lanuginosa (Lipozyme TL IM) was used in solvent-free batch and micro-aqueous reactions and fat blends with different mass ratios were tested. The evolution of TAG profiles, of interesterification degre (ID) and of free fatty acids (FFA), was followed along the reactions. Determination of dropping points (DP) and solid fat contents (SFC) enabled a rheological characterization of the products. The end products were also characterized for their oxidative stability and their textural properties. [less ▲]

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See detailRandom Subwindows and Multiple Output Decision Trees for Generic Image Annotation
Dumont, Marie; Marée, Raphaël ULg; Geurts, Pierre ULg et al

Poster (2007)

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See detailProvenance of Belgian Merovingian garnets by PIXE on IPNAS Cyclotron
Mathis, François ULg; Vrielynck, Olivier; Laclavetine, Kilian et al

Poster (2007)

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See detailControlled release of drugs from an original multi-component device
Nizet, dominique; Zalfen, Alina; Collard, Laurence ULg et al

Poster (2007)

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See detailMechanical stress strongly induces interleukin-6 production by osteoblasts: a new in vitro 3D compression model
Sanchez, Christelle ULg; Gabay, Odile; Salvat, Colette et al

Poster (2007)

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See detailAn unusual cell type of the auditory organ during neonatal development: the inner pillar cells
Thelen, Nicolas ULg; Breuskin, I; Malgrange, B et al

Poster (2007)

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See detailAlien invasive species and climate change: overview of research activities
Vanderhoeven, Sonia ULg; Saad, Layla ULg; Tiébré, Marie-Solange et al

Poster (2007)

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See detailSpring CO2 dynamics within sea ice: abiotical versus biological control.
Delille, Bruno ULg; Schoemann, Véronique; Becquevort, Sylvie et al

Poster (2007)

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See detailPlant-based production of human lysozyme mutants
Tocquin, Pierre ULg; Dumoulin, Mireille ULg; Dony, Nicolas ULg et al

Poster (2007)

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See detailUltrastructural organization of the nucleolus in reptiles
Lamaye, Françoise; Thiry, Marc ULg

Poster (2007)

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See detailThe XMM-LSS Survey : properties and two-point angular correlations of point-like sources
Garcet, O.; Gandhi, P.; Disseau, L. et al

Poster (2007)

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See detailThe Dusty Young Universe
Meisenheimer, K.; Dannerbauer, H.; Klaas, U. et al

Poster (2007)

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See detailRole of coactivators SRC-1 and CARM1 in estrogen receptor-alpha and beta-dependent cell proliferation in the dentate gyrus of adult female rats
Charlier, Thierry ULg; Lieblich, Stephanie E; Pawluski, Jodi L et al

Poster (2007)

Nuclear receptors such as the estrogen receptors (ER) require the presence of coactivator proteins, such as the steroid receptor coactivator (SRC-1) and coactivator-associated arginine methyltransferase ... [more ▼]

Nuclear receptors such as the estrogen receptors (ER) require the presence of coactivator proteins, such as the steroid receptor coactivator (SRC-1) and coactivator-associated arginine methyltransferase (CARM1) to enhance the transcription of target genes. Importantly, in vitro work suggests that ER􀀁 and ER􀀂 differ in the ability to recruit coactivators such as SRC-1. For example, SRC-1 has a strong affinity for ER􀀁 and a weaker affinity for ER􀀂. Interestingly, both ER􀀁 and ER􀀂 are individually involved in estradiol-enhanced cell proliferation in the dentate gyrus of adult female rats. In addition, previous work suggests a role for CARM1 in cell proliferation and for SRC-1 in cell differentiation, therefore the present study aimed to determine whether proliferating cells in the dentate gyrus of the hippocampus co-express the coactivators SRC-1 and CARM1. We also aimed to determine whether ER􀀁 and ER􀀂 agonists would result in altered expression of SRC-1 and CARM1 in new proliferating cells in the dentate gyrus. To investigate this, adult female rats were ovariectomized and treated with either the ER􀀁 agonist Propyl-pyrazole triol (PPT), the ER􀀂 agonist diarylpropionitrile (DPN), estradiol benzoate (EB), or vehicle (CTRL). Rats were then injected with BrdU (200 mg/kg) and sacrificed 24 hours later. Preliminary data suggests that DPN, PPT and EB increase cell proliferation in the dentate gyrus compared to the vehicle-injected group. Interestingly, the number of proliferating cell expressing SRC-1 is similar in all groups, suggesting that neither of the ER agonists nor EB treatment affects the co-expression of BrdU+ cells with SRC-1. However, additional measurements are currently being done to investigate whether CARM-1 is differentially expressed in proliferating cells in the hippocampus following selective ER agonist treatment. [less ▲]

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See detailEffect of aggressive encounters on plasma progesterone, corticosterone and corticosteroid binding capacity
Charlier, Thierry ULg; Hammond, Geoffrey L; Soma, Kiran K

Poster (2007)

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See detailObservations of comet McNaught from La Silla
Snodgrass, C.; Jehin, Emmanuel ULg; Fitzsimmons, A. et al

Poster (2007)

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See detailComposition of degumming residues from oil physical refining : valorization for food application
Pierart, Céline ULg; Cavillot, Véronique; Kervyn de Meerendré, M. et al

Poster (2007)

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See detailVascular architecture of breast cancer xenographs over-expressing MT4-MMP
Chabottaux, V; Thiry, Marc ULg; Blacher, Silvia ULg et al

Poster (2007)

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See detailThe Dusty Young Universe: photometry and spectroscopy of quasars at z > 2
Meisenheimer, K.; Hutsemekers, Damien ULg; Tacconi, L. et al

Poster (2007)

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See detailCaractériser un profil inflammatoire grâce à l'utilisation du microdamier
Ramery, Eve ULg; Closset, Rodrigue; Bureau, Fabrice ULg et al

Poster (2007)

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See detailKarsts in sandstones and quatrzites of Minas Gerais, Brazil
Willems, Luc ULg; Rodet, J.; Pouclet, A. et al

Poster (2007)

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See detailSound production by pectoral spines in Six Synodontis species (Mochokidae)
Fabri, Grégory; Mauguit, Quentin; Vandewalle, Pierre ULg et al

Poster (2007)

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See detailSugar beet leaves as source of lyase in bioprocess producing green note aldehydes
Rabetafika, Holy-Nadia ULg; Gigot, Cédric ULg; Fauconnier, Marie-Laure ULg et al

Poster (2007)

Sugar beet leaves were used as source of lyase in a biocatalytic process for the production of C6-aldehydes. Their hydroperoxide lyase activity was revealed important. The optimum values of pH and ... [more ▼]

Sugar beet leaves were used as source of lyase in a biocatalytic process for the production of C6-aldehydes. Their hydroperoxide lyase activity was revealed important. The optimum values of pH and temperature for reactions were respectively 6.7 and 22 °C. A simple and fast process providing high molar conversion of hydroperoxides to aldehydes is proposed. The yield of the main product cis-3-hexenal reached 80% after only 2 min and was stabilised by acidifying the reaction medium to pH 2. [less ▲]

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See detailThe lymphatic ring assay: a new in vitro model of lymphangiogenesis
Bruyère, F; Melen, L; Blacher, Silvia ULg et al

Poster (2007)

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See detailComputed tomography anatomy of the equine metacarpo-phalangeal joint
Vanderperren; Ghaye, Benoit ULg; Hoegaerts, Michel et al

Poster (2007)

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See detailDendritic cells genetically engineered to express IL-10 induce long-lasting antigen-specific tolerance in experimental asthma
Henry, E.; Desmet, C. J.; Garzé, V. et al

Poster (2007)

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See detailSTAT5 is an Ambivalent Regulator of Neutrophil Homeostasis
Fievez, Laurence ULg; Desmet, Christophe ULg; Henry, E. et al

Poster (2007)

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See detailLipase-catalyzed interesterification of butterfat with rapeseed oil: new approaches for the monitoring of the reaction.
Hanon, Emilien ULg; Aguedo, Mario ULg; Danthine, Sabine ULg et al

Poster (2007)

Butterfat (BF) is one main source of diet fats. However, it has been less and less well perceived due to its poor spreadability when refrigerated and cholesterol and saturated fatty acids, promoters of ... [more ▼]

Butterfat (BF) is one main source of diet fats. However, it has been less and less well perceived due to its poor spreadability when refrigerated and cholesterol and saturated fatty acids, promoters of coronary heart diseases. Thus, consumer’s demand for healthy palatable fat spreads with good development of modified butter-based spreads. One ordinary method used by manufacturers for such modifications is enzymatic interesterification of a lipase to restructure triacylglycerides (TAG), i.e. to induce the exchange of fatty acid residues amongst glycerol backbones. This leads to changes in TAG species and in physical properties of the fat, namely in solid fat content (SFC) and in melting profile. Rapeseed oil (RO) contains a large amount of oleic acid and has significant contents of linoleic and linolenic acids, i.e. a high global content of unsaturation-rich residues. Thus, EIE of BF with RO may bring nutritional improvements to the reaction product, when compared to BF alone. The EIE of BF and canola oil (a low-erucic acid RO) catalyzed by the immobilized sn-1,3 specific Rhizopus arrhizus lipase in solvent-free batch and micro-aqueous systems, was previously studied. The aim of the present study was first to assess the evolution of chemical, physical and thermal modifications occurring during solvent-free batch EIE of BF and RO, with the use of lipozyme TL IM. The evolution of TAG profiles, interesterification degree, dropping point, solid fat content and free fatty acids was monitored during the reaction, especially during the first hours. Differential scanning calorimetry was also applied to follow the formed product. Then the establishment of relations between the DP and differential scanning calorimetry data and the interesterification degree was emphasized. [less ▲]

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See detailThe Belgian guidelines for management of low back pain in occupational health
Mairiaux, Philippe ULg; Mazina, D. ULg

Poster (2007)

Aims As part of the promotion of a national strategy for the prevention and the management of acute and chronic low back pain (CLBP), the Belgian Health Care Knowledge Centre (KCE) funded a systematic ... [more ▼]

Aims As part of the promotion of a national strategy for the prevention and the management of acute and chronic low back pain (CLBP), the Belgian Health Care Knowledge Centre (KCE) funded a systematic review of the EBM literature concerning the management of LBP patients in the occupational health (OH) context. Taking account differences in regulations and practices within the health care system between EU countries1,2, this review aimed at issuing good practices recommendations applicable to the Belgian situation to prevent the transition from acute to chronic back pain and to avoid long duration absences from work. Methods The guidelines have been developed in three steps. First, an electronic search was performed for relevant guidelines and systematic reviews (SR) on the following databases: EMBASE, Medline, Cochrane Controlled Trials Register, NHS guidelines Finder, National Guidelines Clearing House, New Zealand Guidelines Group Search and Pedro database. The search strategy combined 3 groups of terms: low back pain, occupational medicine and the type of reference (practice guideline or SR). The identified guidelines were appraised using the AGREE method, while SR’s were appraised using the Cochrane Collaboration grid. In a second phase, the draft guidelines were submitted to a group of OH academics from the main Belgian universities. The revised version of the guidelines was then published in English in the KCE report 3. In a third step currently under way, the guidelines are adapted in a more practical format for facilitating their daily use by OH practitioners. This involves a working group of OH practitioners coming from 12 external prevention services and several large company OH services. The document will also be discussed with representatives of other health professionals (GP’s and medical advisors of the sickness funds). Results Scientific evidence from the 7 selected guidelines and from the 27 SR’s was organized according to the main missions of the occupational physician (OP) and medical adviser (MA). Which background information should be given to employers and employees when the OP is playing an adviser role? What evidence-based prevention policies (primary and secondary) should he/she promote in the enterprises? For the third mission of the OP, health surveillance of workers, the document considers three situations: periodic health surveillance, spontaneous examinations at the worker request, and return to work (RTW) examinations for workers absent for 28 days or more. The main conclusions are summarized in 4 tables under the format of key-points, each of those mentioning the quality of the evidence (using the Guyatt classification). Discussion and conclusions The key message for prevention of CLBP is the need for staying active and minimizing the time out of work. Evidence of high quality is in favor of a multidisciplinary approach using conservative treatments. One challenge is to avoid hospitalizations and especially surgery in CLBP patients. Those recommendations are relevant for all care settings, including the occupational environment. From a health care policy point of view, the project highlighted the major roles of the occupational physician and of the medical adviser and stressed the need to better define those roles if decision makers want to tackle the low back pain problem and the economic consequences of the related sick leave. References 1. Dutch Association of Occupational Medicine (NVAB). Management of low back workers by the occupational physician. Approved guidelines ; April 1999. 2. RCM-FOM. Occupational health guidelines for management of low back pain at work: Evidence Review and Recommendations. London, 2000. 3. Nielens H., Van Zundert J., Mairiaux P., Gailly J., Van Den Hecke N., Mazina D., Camberlin C., Bartholomeeussen S., De Gauquier K., Paulus D., Ramaekers D. Chronic Low Back Pain. Good Clinical Practice (GCP). Brussels: Belgian Health Care Knowledge Centre (KCE); 2006. KCE reports 48B (D/2006/10.273/64). [less ▲]

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See detailFeasibility of a urine-based DNA methylation assay for early detection of bladder cancer
Renard, Isabelle; Kelly, J.; Collette, Catherine et al

Poster (2007)

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See detailDevelopment of urine-based DNA methylation assay for prostate cancer screening
Vener, T. I.; Derecho, C.; Varde, S. et al

Poster (2007)

Introduction: The best outcome for patients with prostate cancer (PCa) is seen for those treated at an early stage of the disease. A digital rectal examination (DRE) and the measurement of serum prostate ... [more ▼]

Introduction: The best outcome for patients with prostate cancer (PCa) is seen for those treated at an early stage of the disease. A digital rectal examination (DRE) and the measurement of serum prostate specific antigen (PSA) levels are the current standards for PCa early detection. However, serum PSA testing lacks both sensitivity and specificity, and core biopsies frequently fail to identify small foci of PCa. The availability of non-invasive diagnostic molecular tests that could allow for a more precise identification of malignant prostate cells in asymptomatic men would be of great clinical value to improve PCa diagnosis. Study design: 114 men scheduled to undergo a prostate biopsy were enrolled in the study. The biopsies were triggered either by an abnormally high PSA value or by suspicious findings on DRE. Patients with other known or suspected urinary malignancy were excluded from the study. Morning, post-prostate massage and post-biopsy urine samples were collected from all individuals. The main goals of this study were a) to determine if prostate massage can improve the prostate DNA quantity compared to urine collected in the morning or after biopsy, and b) to evaluate the methylation status of a gene panel in urine samples from subjects with cancer found in prostate biopsy tissue cores versus subjects without cancer. Methods: Gene promoter methylation is associated with prostate cancer and has been successfully used for the molecular detection of neoplasia in urine. We have developed real-time methylation specific PCR assays to define the methylation status of several genes. Results: Median age of the patients was 65 years (range 48-85). PCa was found in 51% of the patients. Histological diagnosis of the biopsies was compared to methylation results in urine from 102 samples (89% success rate due low DNA yields for 12 samples). The comparison between different urine sampling techniques showed that prostate massage is needed. The best results were obtained in post massage urine samples with a combination of GSTP1, p14, p16, RARβ2 and RASSF1A resulting in a sensitivity of 74% and a specificity of 75%. Future: A multiplex assay using the Cepheid SmartCycler™ II platform is under development. Further studies are in progress to validate the assay across multiple centers. [less ▲]

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See detailThe Mus musculus Mx1 gene confers strong protection against highly pathogenic influenzavirus A H5N1
Garigliany, Mutien-Marie ULg; Lambrecht, Bénédicte; Leroy, Michaël et al

Poster (2007)

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See detailMG-63 Osteoblast culture on P culture on PLA– based copolymers for bone tissue engineering applications
Moniotte, Nicolas; Shim, Yong-Ho; Borget, Pascal et al

Poster (2007)

Physical injury or pathological changes such as removal of a tumor can result in large bone defects, preventing the recovery of its original function. Autogenous bone grafting, which is the most common ... [more ▼]

Physical injury or pathological changes such as removal of a tumor can result in large bone defects, preventing the recovery of its original function. Autogenous bone grafting, which is the most common technique for bone defect repairing, is associated with serious limitations, e.g. limited supply and donor site morbidity. Since a few years bone tissue engineering by degradable biomaterials has been shown as a very promising avenue for providing bone substitutes. Among these materials, bioresorbable synthetic polymers such as poly(ethylene oxide) (PEO), poly(vinyl alcohol) (PVA), poly(acrylic acid) (PAA) and poly(lactic acid) (PLA) are very appealing because their chemistry and properties are controllable and reproducible. Cellular activity and proliferation of osteosarcoma cell lines (MG-63) on films were determined by the tetrazolium salt MTT assay and by phase contrast/fluorescence microscope observations. The cytotoxicity of the materials was found to be low or negligible. Cells viability variations were observed on the surface of the films. Long-term cell culture and degradability of PLA-PEOpolymer film was investigated by optical microscopy (Giemsa staining) and environmental scanning electron microscopy (ESEM). Hydrolysis of the PLLA ester linkages led to slow film degradation. After 113 days, optical microscope observations revealed the presence of large cracks on the surface, and even breaks of small polymer fragments, while MG-63 proliferation was still very important, showing a tissue-like aspect, with extracellular matrix (ECM) deposition. These results show that PLA-PEO copolymers are very interesting bioresorbable materials for long-term bone tissue engineering applications. [less ▲]

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See detailUltrastructural organization of the reptilian nucleolus
Lamaye, Françoise; Thiry, Marc ULg

Poster (2007)

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See detailVascular architecture of breast cancer xenographs over-expressing MT4-MMP
Chabottaux, V; Thiry, Marc ULg; Blacher, Silvia ULg et al

Poster (2007)

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See detailL'assiette du Belge en chiffres
Duquesne, Brigitte ULg

Poster (2007)

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See detailDirecting the lipopeptide Mycosubtilin biosynthesis toward C17:0 branched isoform influences the expression of cspB and cspC in Bacillus subtilis
Guez, Jean-Sébastien; Drucbert, A.; Müller, C. et al

Poster (2007)

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See detailCharacterization of puff pastry margarines with and without TFA
Cavillot, V; Kervyn de Meerendré, M; Pierart, Céline ULg et al

Poster (2007)

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See detailSound production mechanism in the clownfish Amphiprion clarkii (Amphiprioninae, Pomacentridae)
Colleye, Orphal ULg; Herrel, Anthony; Mauguit, Quentin et al

Poster (2007)

Clownfishes live in social group within sea anemones. They are prolific “singers” that produce a wide variety of sounds, described as “pops” and “chirps”, involved in both reproductive and agonistic ... [more ▼]

Clownfishes live in social group within sea anemones. They are prolific “singers” that produce a wide variety of sounds, described as “pops” and “chirps”, involved in both reproductive and agonistic interactions. Although clownfish sounds were recorded since 1930, the mechanism of sound production has remained unresolved. The sounds used to describe the sonic mechanism were directed towards hetero- and conspecifics that approach their sea anemone host. Sound recordings were synchronized using a high speed video (500 fps) coupled or not with an X-ray system. These systems allowed to quantify the movements of external and internal bones during sound production. Sounds were typically accompanied by rapid (< 30 ms) head movements such as elevation of the skull, lowering of the hyoid bar and the anterior part of the branchial basket, retraction of the pectoral girdle, and finally closing of the mouth. Synchronization of sound pulses with X-ray images indicates that sound is produced when the hyoid apparatus is completely lowered and the mouth closed by a previously unknown mechanism. Dissections of freshly dead specimens reveal an unusual ligament responsible for the rapid mouth closing. This ligament joins the hyoid bar to the internal part of the mandible. Acting as a cord, it forces the mandible to turn around its articulation during the lowering of the anterior part of the branchial basket, forcing the mouth to close. Sounds result from the collision of the jaw teeth, transferring energy to the jaws that are presumably the sound radiator. [less ▲]

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See detailEvaluation of the antitumor activity of 16K prolactin
Kinet, Virginie; Nguyen, Ngoc-Quynh-Nhu ULg; Cornet, Anne ULg et al

Poster (2007)

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See detailFibrous mucosa preservation with NobelGuide
Bolland, Fabrice; Van Heusden, Alain ULg

Poster (2007)

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See detailAnalysis of furan by GC/MS
Scholl, Georges ULg; Eppe, Gauthier ULg; Scippo, Marie-Louise ULg et al

Poster (2007)

Detailed reference viewed: 26 (4 ULg)