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See detailUse of somatic hybridization to look for aromatic liness of Abies : preliminary results
Misson, Jean-Pierre; Thomas, Cynthia; Roblain, N. et al

Poster (2009)

Objectif : Associer les caractéristiques de croissance d’Abies nordmanniana aux propriétés aromatiques d’Abies balsamea Axes de recherche: - Hybridation somatique à partir de protoplastes d’Abies balsamea ... [more ▼]

Objectif : Associer les caractéristiques de croissance d’Abies nordmanniana aux propriétés aromatiques d’Abies balsamea Axes de recherche: - Hybridation somatique à partir de protoplastes d’Abies balsamea et Abies nordmanniana. - Détermination des profils aromatiques comme moyen de criblage. [less ▲]

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See detailBiomimetic approaches to understand how mycosubtilin, an antifungal lipopeptide, can interact with cytoplasmic membranes
Nasir, Mehmet Nail ULg; Kouzayha, Achraf; Besson, Françoise

Poster (2009)

Mycosubtilin is a natural cyclic lipopeptide characterized by its strong antifungal activities. It has been demonstrated that the cytoplasmic membranes of the sensitive cells are the target of this ... [more ▼]

Mycosubtilin is a natural cyclic lipopeptide characterized by its strong antifungal activities. It has been demonstrated that the cytoplasmic membranes of the sensitive cells are the target of this antifungal lipopeptide. In spite of the fact that some properties of mycosubtilin have been highlighted, the molecular mechanism of its biological action remains partially understood. In view of this, we investigated the interactions between mycosubtilin and cytoplasmic membranes by using biomimetic systems such as lipid monolayers at the air-water interface and lipid multilayers. These interactions were examined by different methods (pressure/area isotherms, kinetic measurements of the interfacial adsorption, Brewster angle microscopy, infrared and NMR spectroscopies). We showed that mycosubtilin does not interact strongly with the C=O ester residues of phospholipids in multilayers, while it modifies the transition temperature of the alkyl chains. It was also demonstrated that these interactions depend on the phospholipid phase. Varying the lipid composition of monolayers allowed us to demonstrate an original behavior of mycosubtilin in the presence of sterol. This suggests a mycosubtilin-sterol affinity. [less ▲]

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See detailTotal Error-Based Criterion for Analytical Method Transfer
Rozet, Eric ULg; Dewe, W.; Boulanger, Bruno ULg et al

Poster (2009)

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See detailAntioxidant and cytotoxicity activity of essential oil grown Lavandula dentata
Imelouane, B.; El Bachiri, A.; Wathelet, Jean-Paul ULg et al

Poster (2009)

The present study describes the phytochemical profile Antioxidant and cytotoxicity activity of Lavandula dentata essential oil, collected in eastern Morocco (Taforalt). The sample of essential oil was ... [more ▼]

The present study describes the phytochemical profile Antioxidant and cytotoxicity activity of Lavandula dentata essential oil, collected in eastern Morocco (Taforalt). The sample of essential oil was obtained from the aerial parts of the plant by hydrodistillation and analyzed by GC–MS. The in vitro cytotoxicity of the oil on the cancer cell lines PC-3 (prostate), V79 (fibroblaste) and normal P388D1 (murine macrophage) was examined. We have shown that the oil had negligible cytotoxic effects against all cell lines tested. The oil was also found to possess antioxidant activity as demonstrated by the 1,1-diphenyl-2- picrylhydrazyl (DPPH) radical method. Lavandula dentata essential oil has promising potentials for incorporation into various food, cosmetic and pharmaceutical products for which a natural aroma, colour, antioxidant and antimicrobial additive is desired. [less ▲]

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See detailTurtle cell cultures for nucleolar studies
Lamaye, Françoise; Thiry, Marc ULg

Poster (2009)

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See detailStudy of Essential Oils of Some Plants from Algeria (Salvia officinalis, Thymus vulgaris and Ruta chalepensis)
Brada, M.; Achour, D.; Wathelet, Jean-Paul ULg et al

Poster (2009)

The essential oil of three plants (Salvia officinalis, Thymus vulgaris and Ruta chalepensis) collected from Chlef, in the north west of Algeria, was isolated by steam distillation and investigated by GC ... [more ▼]

The essential oil of three plants (Salvia officinalis, Thymus vulgaris and Ruta chalepensis) collected from Chlef, in the north west of Algeria, was isolated by steam distillation and investigated by GC and GC/MS. The yield of essential oil (g/100g) was 1.6% for Salvia officinalis, 2.6% for Thymus vulgaris and 1.1% for Ruta chalepensis. The Salvia officinalis was mainly composed of b-thujone (25%), camphor (23.6%), 1,8-cineole (21.5%), viridiflorol (9.5%) and a-thujone (6%). The main constituents of Thymus vulgaris were carvacrol (48.4%), g -terpinene (14.9%), p-cymene (14.7%) and thymol (5.6%) while 2-undecanone (83.2%) constituted the major component of Ruta chalepensis essential oil. [less ▲]

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See detailMCF-7/BOS cells membrane proteome: comparison of two isolation methods using mass spectrometry
Bertrand, Virginie ULg; Massart, Anne-Cécile ULg; De Pauw-Gillet, Marie-Claire ULg et al

Poster (2009)

Membrane proteins (MP) play an important role in biological processes. Isolation and quantification of these MP using classical techniques is often limited due to their poor solubility and relatively low ... [more ▼]

Membrane proteins (MP) play an important role in biological processes. Isolation and quantification of these MP using classical techniques is often limited due to their poor solubility and relatively low abundance. These membrane proteins enclosed markers which could be potential therapeutic targets. These potential therapeutic targets have to be accessible to antibodies and need to be presented in the plasmic membrane. Assays were conducted on MCF-7 / BOS cell line, immortal and easier to cultivate. The goal of this work is to obtain an enriched membrane fraction to facilitate the analysis of the sample and to simplify the complex proteins mixture. To isolate transmembrane proteins, we compared two methods. The first one used different extraction cycles characterized by different buffers to isolate membrane proteins. The second method labelled accessible extracellular domains at the surface of MCF-7 cells with biotin prior to differential centrifugation. The obtained enriched membrane proteome was digested with trypsin and/or Lysyl Endopeptidase. Obtained peptides were separated by 2D-HPLC chromatography and on-line analysed ion trap mass spectrometer, the Esquire HCT. [less ▲]

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See detailSensitivity analysis of a 3D diffusive drying model
Janas, Sébastien ULg; Deroanne Claude; Bera, François ULg

Poster (2009)

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See detailInfluence of drying methods on yield and chemical composition
Dahak, K.; Wathelet, Jean-Paul ULg; Chechouani, H. et al

Poster (2009)

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See detailEvaluation de la diversité de la végétation spontanée de l’écosystème urbain de Bujumbura.
Bigirimana, J; Bogaert, Jan ULg; De Cannière, C et al

Poster (2009)

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See detailEnrichment of Anhydrous Milk Fat in Polyunsatured Fatty Acid Residues
Aguedo, Mario ULg; Hanon, Emilien ULg; Danthine, Sabine ULg et al

Poster (2009)

Lipozyme TL IM was used in a solvent-free batch, microaqueous system for enzymatic interesterification of anhydrous milkfat (AMF) with linseed oil (LO) in binary blends and with rapeseed oil (RO) in one ... [more ▼]

Lipozyme TL IM was used in a solvent-free batch, microaqueous system for enzymatic interesterification of anhydrous milkfat (AMF) with linseed oil (LO) in binary blends and with rapeseed oil (RO) in one ternary blend. [less ▲]

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See detailAnalysis of Titan airglow UV spectra from Cassini Ultraviolet Imaging Spectrograph (UVIS)
Gustin, Jacques ULg; Ajello, J.M.; Stevens, M.H. et al

Poster (2009)

We present the analysis of FUV (1150-1750 Å) limb dayglow spectra of Titan’s atmosphere obtained on 13 December 2004 at 5 Å resolution by the Ultraviolet Imaging Spectrograph (UVIS) onboard Cassini. The ... [more ▼]

We present the analysis of FUV (1150-1750 Å) limb dayglow spectra of Titan’s atmosphere obtained on 13 December 2004 at 5 Å resolution by the Ultraviolet Imaging Spectrograph (UVIS) onboard Cassini. The fit to the data show that Titan’s airglow consists of four principal emissions: 1) the N2 Lyman-Birge-Hopfield (LBH) band system, which peaks in intensity at 1150 +/- 50 km, 2) N I multiplets peaking at 1050km +/- 50 km, 3) sunlight reflected by N2 between 0 and 300 km and 4) H Ly alpha which grows in intensity with increasing altitude. Comparisons with limb spectra obtained by the Voyager 1 Ultraviolet spectrometer (V1/UVS) show that the vertically integrated brightness are larger for V1/UVS than for UVIS by a factor of 3, consistent with the XUV solar flux ratio at Titan at the time of these observations. The N2 LBH and N I profiles obtained from the regression to the Titan data are compared to models obtained by the Atmospheric Ultraviolet Radiance Integrated Code (AURIC), adapted from Earth’s atmosphere to Titan’s. [less ▲]

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See detailInteresterification of rapeseed oil with anhydrous milk fat and its stearin fraction
Giet, Jean-Michel ULg; Aguedo, Mario ULg; Hanon, Emilien ULg et al

Poster (2009)

The compositional changes occurring during the lipase-catalysed interesterification of AMF/rapeseed oil (RO) and AMF stearin fraction (AMFSF)/RO blends were described in the first part of this study. In ... [more ▼]

The compositional changes occurring during the lipase-catalysed interesterification of AMF/rapeseed oil (RO) and AMF stearin fraction (AMFSF)/RO blends were described in the first part of this study. In the present and second part are reported the resulting changes in physical properties, especially the melting behaviour through solid fat content (SFC), dropping point (DP) and fusion profiles by differential scanning calorimetry (DSC). [less ▲]

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See detailInteresterification of rapeseed oil with anhydrous milk fat and its stearin fraction
Aguedo, Mario ULg; Giet, Jean-Michel ULg; Hanon, Emilien ULg et al

Poster (2009)

Rapeseed oil (RO) (a choice source of unsaturation-rich residues) was used in the present study to enrich anhydrous milk fat (AMF) with unsaturated C18 fatty acids (FA) (oleic, linoleic and linolenic ... [more ▼]

Rapeseed oil (RO) (a choice source of unsaturation-rich residues) was used in the present study to enrich anhydrous milk fat (AMF) with unsaturated C18 fatty acids (FA) (oleic, linoleic and linolenic acids). Comparatively, one “harder” fraction of AMF underwent the same reaction. The physico-chemical properties modifications induced by the reaction were followed. The compositional changes are reported in this first part and the consequent physical modifications are presented in a second part. [less ▲]

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See detail4th International Symposium on Chemosynthesis-based Ecosystems
Ponsard, J; Cambon-Bonavita, M-A; Lepoint, G et al

Poster (2009)

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See detailEvaluation of decision methodologies for analytical method validation
Rozet, Eric ULg; Rudaz, S.; Bouabidi, A. et al

Poster (2009)

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See detailMapping of soil-sediment systems contaminations around a metal-ore smelter : The example of Cu in Lubumbashi (R.D.Congo).
Mpundu, Michel; Mukobo, Robert-Prince; Kaya Muyumba, Donato ULg et al

Poster (2009)

The Katanga is famous for its high richness in metal ores, mainly Cu- and Co-minerals. The ore treatments activities lead to metal spreading in the environment which do endanger the viability of ... [more ▼]

The Katanga is famous for its high richness in metal ores, mainly Cu- and Co-minerals. The ore treatments activities lead to metal spreading in the environment which do endanger the viability of ecosystems and human health. The contaminations of soils and sediments around the Gecamines smelter in Lubumbashi have been evaluated through a multi-scale approach. In the first stage, a reference system about the natural contents in soils has been implemented. The main units of the detailed (1:20 000) soil map have been characterized through field observations and laboratory determinations : acido-basic and organic status, particle size distribution, cationic exchange capacity, total contents in Al, Fe, Mn, Cu, Co, Cd, Pb, Zn. An exploratory mapping of soil contaminations (Cu, Co, Cd, Pb, Zn) centered on the Gecamines cheminey was then conducted as a second stage of the approach. Detailed investigations were finally performed in the Gecamines district where signs of soil degradation were the highest. The spatial continuity and the differenciation (C : C0+C ratio) of the studied parameters appeared weak. No clear effect of the dominant wind direction on the spatial distribution of the contaminants could be identified despite a clear degradation of the ecosystem in the area under dominant wind. However the detailed approach showed evidences of (i) significant wind deposits in the Gecamines district, (ii) and local man-made deposits but also (ii) important processes of redistribution in the landscape through erosion/sedimentation or anthropic activities. Our results point out the difficulty to identify the sources of contaminations in an urban environment and stress the need to have approaches with complementary levels of details. [less ▲]

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See detailSynthesis of Ag/TiO2 hybrid photocatalysts by sol-gel process with new P-alkoxide functionalized ligands
Lambert, Stéphanie ULg; Bied, Catherine; Bodson, Céline et al

Poster (2009)

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See detailTransmission des prix dans le secteur laitier en France
Burny, Philippe ULg

Poster (2009)

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See detailThe Europlanet national nodes network
Fouchet, T.; Heward, A.; Chatzchristou, E. T. et al

Poster (2009)

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See detailWheat root ecophysiology: understanding communication between wheat root system and soil microorganisms.
Delaplace, Pierre ULg; d'Ans, Séverine ULg; Wathelet, Jean-Paul ULg et al

Poster (2009)

Studies leading to a better understanding of the mechanisms involved in the communication between soil microorganisms and root system can potentially lead to improved fertility management strategies. Up ... [more ▼]

Studies leading to a better understanding of the mechanisms involved in the communication between soil microorganisms and root system can potentially lead to improved fertility management strategies. Up to now, the characterization of such interactions has been mainly focused on root exsudates but volatile organic compounds (VOC) also play a role as chemical messengers in positive interactions occurring in the rhizosphere. We aim to better understand the VOC-mediated chemical ecophysiology of soil. Wheat (Triticum aestivum L.) was chosen in this project based on its importance for food production and industrial applications. [less ▲]

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See detailContribution to the study of semiochemical slow release formulations. Development of flash chromatographic methods.
Heuskin, Stéphanie ULg; Farmakidis, Julien; Lorge, Stéphanie et al

Poster (2009)

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See detailSet-up of Z- and E-guggulsterones purification method from guggul-gum extracts by liquid chromatography and study of their activities on human preadipocytes differentiation
Hanon, Emilien ULg; Keophiphath, Mayoura; Jacquemond-Collet, Ingrid et al

Poster (2009)

The rising prevalence of obesity within both industrialized and emerging societies is a major public health problem. Indeed obesity is a usual risk factor in the development of metabolic and ... [more ▼]

The rising prevalence of obesity within both industrialized and emerging societies is a major public health problem. Indeed obesity is a usual risk factor in the development of metabolic and cardiovascular diseases which nowadays rank among the highest causes of premature death. Therefore, modulating fat mass expansion represents a worldwide challenge. In this context, adipocyte differentiation, which corresponds to the cellular transition of a fibroblastic cell (the preadipocyte) to a highly specialized cell accumulating triglycerides (the adipocyte), is a decisive process in the expansion of adipose tissue during life span and consequently, in the development of obesity. Adipogenesis markers such as PPARg2, C/EBPa, lipoprotein lipase (LPL), perilipin (PLIN) and the adipokines (leptin and adinopectin) are known to be expressed throughout the different stages of adipocyte differentiation. Guggulsterones are the principal bioactive steroidal components found in the oleoresin (guggul gum) collected from the indian guggul tree, Commiphora mukul (Hook, ex Stocks) Engl. The objective of this study was to investigate the effects of the two purified diastereoisomeric forms of guggulsterones (Z- and E-) on the human preadipocytes proliferation and differentiation. [less ▲]

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See detailThe effects of purified Z- and E-guggulsterones from guggul-gum extract on human preadipocytes proliferation and differentiation through the study of gene expression of adipose markers.
Hanon, Emilien ULg; Keophiphath, Mayoura; Jacquemond-Collet, Ingrid et al

Poster (2009)

The rising prevalence of obesity within both industrialized and emerging societies is a major public health problem. Indeed obesity is a usual risk factor in the development of metabolic and ... [more ▼]

The rising prevalence of obesity within both industrialized and emerging societies is a major public health problem. Indeed obesity is a usual risk factor in the development of metabolic and cardiovascular diseases which nowadays rank among the highest causes of premature death. Therefore, modulating fat mass expansion represents a worldwide challenge. In this context, adipocyte differentiation, which corresponds to the cellular transition of a fibroblastic cell (the preadipocyte) to a highly specialized cell accumulating triglycerides (the adipocyte), is a decisive process in the expansion of adipose tissue during life span and consequently, in the development of obesity. Adipogenesis markers such as PPARg2, C/EBPa, lipoprotein lipase (LPL), perilipin (PLIN) and the adipokines (leptin and adinopectin) are known to be expressed throughout the different stages of adipocyte differentiation. Guggulsterones are the principal bioactive steroidal components found in the oleoresin (guggul gum) collected from the indian guggul tree, Commiphora mukul (Hook, ex Stocks) Engl. The objective of this study was to investigate the effects of the two purified diastereoisomeric forms of guggulsterones (Z- and E-) on the human preadipocytes proliferation and differentiation. [less ▲]

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See detailProduction and toxicity of γ-decalactone and 4-hydroxydecanoic acid from Rhodotorula aurantiaca
Alchihab, Mohamed ULg; Destain, Jacqueline ULg; Aguedo, Mario ULg et al

Poster (2009)

The objective of this study was to compare the production of γ- decalactone in different scales and to study the effects of 4- hydroxydecanoic acid and γ-decalactone on the growth of R. aurantiaca. The ... [more ▼]

The objective of this study was to compare the production of γ- decalactone in different scales and to study the effects of 4- hydroxydecanoic acid and γ-decalactone on the growth of R. aurantiaca. The effect of gum tragacanth on the production of γ-decalactone by R. aurantiaca was evaluated. [less ▲]

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See detailHigh-throughput methodology applied to screening of carbohydrate-based surfactant interfacial properties for colloidal system formulations
Razafindralambo, Hary ULg; Blecker, Christophe ULg; Deroanne et al

Poster (2009)

Carbohydrate-based surfactants (CBS) constitute an attractive class of amphiphilic molecules owing to their structural diversity generating a wide range of properties which could be developed in food and ... [more ▼]

Carbohydrate-based surfactants (CBS) constitute an attractive class of amphiphilic molecules owing to their structural diversity generating a wide range of properties which could be developed in food and non-food applications. Based on many functional groups of the carbohydrate part, it is possible to design multiple amphiphilic structures of CBS varying in the hydrophilic head groups (mono-, oligo-, or polysaccharides), hydrophobic tail (mono-, di-, tricatenar) but also in the linker/spacer between them. The main structures of CBS include mono- and bicatenar glycolipids, bolaforms, and gemini. Moreover, CBS compounds can be produced from the most abundant renewable materials allowing large product concept possibilities. Among general properties of surfactants, interfacial properties molecules occupy a fundamental key role for colloidal system formulations since they control most of technological aptitudes required for forming and stabilizing food, cosmetic, agrochemical, detergent, and pharmaceutical products. High-throughput methodology applied to screening of CBS interfacial properties appears crucial for achieving optimum formulations of colloidal systems like foams and emulsions for which small amounts of single or mix surface-active agents are often needed and numerous physical and chemical parameters are involved. This general approach may be applied to any amphiphilic molecules produced from other renewable resources of surface-active compounds like micro-organisms and by direct extraction from vegetable materials. One of the key factors for the development of this methodology is the use of automated instrument systems in laboratory scale which are still lacking in this field compared to those existing in the analytical chemistry and biochemistry areas. [less ▲]

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See detailEvaluation of the long-term barrier effect of commercial resorbable guided tissue regenerative membranes : an in vitro study using human gingival fibroblasts
Grenade, Charlotte ULg; Borget, Pascal; Moniotte, Nicolas et al

Poster (2009)

Introduction The first part of the study devoted to guided tissue regenerative membranes was focused on a better understanding of the physicochemical and mechanical properties of commercial materials. The ... [more ▼]

Introduction The first part of the study devoted to guided tissue regenerative membranes was focused on a better understanding of the physicochemical and mechanical properties of commercial materials. The second objective of our study was to develop an in vitro device able to measure the long-term barrier effect of resorbable membranes. After the development of this new device, experiments were realized to characterize the long-term behaviour of commercially membranes with human gingival fibroblasts (HGF). Materials and methods The use of human gingival fibroblastic cells was chosen to get closer to biological conditions. Some gingival explants were removed in young and non-smoking healthy patients. From these explants, fibroblastic cells were isolated and cultivated. These cells will be able to be used between the third and the sixth passage. Resorbable membranes were chosen because they don’t require a second surgical operation. There are made of polyesters or collagen. A system based on inserts was developed in order to follow the degradation of membranes and the migration of cells across the material. The membrane was cut into 8 mm diameter punches and set in the bottom of the system. Once the whole was put together, it is laced into a 12 wells plate culture. First, the plates were put in an incubator at 37°C, during times ranging from 24 hours to several months. The barrier effect was then measured to reflect the gradual increase of permeability of each membrane. For this purpose, HGF were seeded on the different samples. The top of the bottle and the bottom of the well were then filled with culture medium. Non degradable synthetic Bioflex membranes were chosen as control samples which don't let pass cells (porosity : 0,4 µm). After 48 hours of incubation in the presence of cells, pictures of cells on membranes and in the bottom of wells were taken with an optic microscope. Viability tests (MTS) were then realized on membranes to evaluate cells proliferation and in the bottom of wells to measure barrier effect. Finally, the morphology of cells on selected membranes was characterized by Scanning Electron Microscopy. Conclusion Proliferation results correspond to data published by several authors. Furthermore, the barrier effect times found in the present study are similar to barrier effect times demonstrated in in vivo studies and announced by manufacturers. In conclusion, the finalized system is adapted to the analysis of long-term barrier effect of commercial GTR membranes. This system will be tested with synthetic bioresorbable membranes made of copolymers. [less ▲]

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See detailThe strange case of the Of?p stars
Nazé, Yaël ULg; Walborn, N. R.; Martins, F. et al

Poster (2009)

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See detailClinal differentiation during invasion: Senecio inaequidens (Asteraceae) along altitudinal gradients in Europe.
Monty, Arnaud ULg; Mahy, Grégory ULg

Poster (2009)

Plant population differentiation may play a role in decreasing the ability to predict whether, where, and when an introduced species will invade. However, few studies have addressed the level of genetic ... [more ▼]

Plant population differentiation may play a role in decreasing the ability to predict whether, where, and when an introduced species will invade. However, few studies have addressed the level of genetic change an alien species may undergo during range expansion, e.g. in response to climatic variation with altitude. In the present study, we tested the hypothesis that invasive populations of Senecio inaequidens (Asteraceae) differentiated during migration from two independent introduction sites into divergent altitudinal and climatic zones. We carried out two years of common garden experiments with eight populations from a Belgian altitudinal transect and ten populations from similar French transect. Climatic analysis revealed that the Belgian transect followed a temperature and precipitation gradient. A temperature and summer drought gradient characterized the French study site. We evaluated differentiation and clinal variation in the following characters: days to germination, days to flowering, height at maturity, final plant height and aboveground biomass. Results showed that S. inaequidens populations differentiated in growth traits during invasion. First year of experiment, regressing population growth trait means against source population altitude indicated the presence of clinal variation along both transects. Second year, similar results were found along the French transect, i.e. a reduction in height at maturity, plant height and aboveground biomass with increasing altitude. Including seed mass as a covariate did not change the outcome of the analysis. The possible evolutionary causes for the differentiation observed are discussed. [less ▲]

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See detailInvasive plant species management tests in Southern Belgium
Delbart, Emmanuel ULg; Halford, Mathieu ULg; Pieret, Nora et al

Poster (2009)

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Peer Reviewed
See detailGenetic structure of Barn swallow (Hirundo rustica).
Dardenne, Sophie ULg; Stevens, Virginie ULg; Hollander, F. et al

Poster (2009)

Detailed reference viewed: 12 (3 ULg)
See detailThe fast regulation of aromatase activity by phosphorylations is species and tissue-independent.
Charlier, Thierry ULg; Harada, Nobuhiro; Ball, Gregory F. et al

Poster (2009)

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See detailGlass production in late antiquity
Van Wersch, Line ULg; Mathis, François ULg; Dupuis, Thomas ULg et al

Poster (2009)

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See detailCarbon cycling in the mixolimnion of Lake Kivu (East Africa)
Borges, Alberto ULg; Descy, J.-P.; Delille, Bruno ULg et al

Poster (2009)

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See detailLe microdamier: un outil du futur pour le diagnostic de l’inflammation ?
Mignot, Clémence ULg; Fraipont, Audrey ULg; Richard, Eric et al

Poster (2009)

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See detailAchromatization of solar concentrator using diffractive optics
Languy, Fabian ULg; Lenaerts, Cedric ULg; Loicq, Jerôme ULg et al

Poster (2009)

Photovoltaic energy suffers from payback time. High solar concentration (above 500 suns) is a very interesting way to reduce production cost. The use of lenses allows more flexibility to make light flux ... [more ▼]

Photovoltaic energy suffers from payback time. High solar concentration (above 500 suns) is a very interesting way to reduce production cost. The use of lenses allows more flexibility to make light flux more uniform. In addition lenses are less prone to errors of manufacture and can be easily duplicated. Unfortunately, optical materials are very dependent on the wavelength which causes important chromatic aberrations. One can think about achromatic doublets but doublets are thick, heavy and require exotic glasses which make them expensive. During the conference, I would like to present an innovative way to achromatize solar concentrators using hybrid (refractive/diffractive) lenses. Indeed, an hybrid lens is as thin as a Fresnel lens and is made in only one glass. But diffractive lenses suffer from limited broadband diffraction efficiency due to spurious orders. To overcome the lake of efficiency we are investigating the use of multi-layer diffractive optical element. This technique allows to achieve an efficiency greater than 97% over the full visible spectrum using only three components (e.g. two optical elements + air). [less ▲]

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See detailSeasonal variability of carbon dioxide and methane in the rivers and lagoons of Ivory Coast (West Africa)
Koné, Y. J. M.; Abril, G.; Delille, Bruno ULg et al

Poster (2009)

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See detailCarbon cycling in the mixolimnion of Lake Kivu (East Africa)
Borges, Alberto ULg; Descy, J.-P.; Delille, Bruno ULg et al

Poster (2009)

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See detailTransinusoidal portal vein embolisation with Onyx: feasibility study in pigs
Smits; Hav; Vanlengenhoeve et al

Poster (2009)

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See detailSynthèse et propriétés tensioactives de nouveaux surfactants provenant de matières premières renouvelables.
Laurent, Pascal ULg; Razafindralambo, Hary ULg; Wathelet, Bernard ULg et al

Poster (2009)

A l'heure actuelle, le bioraffinage se présente de plus en plus comme une alternative prometteuse aux filières pétrochimiques puisqu'il vise à la fois le remplacement d'une partie du pétrole comme source ... [more ▼]

A l'heure actuelle, le bioraffinage se présente de plus en plus comme une alternative prometteuse aux filières pétrochimiques puisqu'il vise à la fois le remplacement d'une partie du pétrole comme source d'énergie et le développement de produits chimiques issus de la biomasse (végétale principalement) tels que détergents, produits phytopharmaceutiques, dissolvants, matières plastiques, etc. La valorisation de carbohydrates provenant de matières premières renouvelables fait ainsi actuellement l'objet de nombreuses recherches. Dans ce cadre, la synthèse de nouveaux tensioactifs non ioniques dérivés des acides Dglucuronique et D-galacturonique a été effectuée. [less ▲]

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

Poster (2009)

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See detailReptile cell cultures for nucleolar studies
Lamaye, Françoise; Thiry, Marc ULg

Poster (2009)

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See detailNon destructive testing by digital shearography using a Savart plate
Michel, Fabrice ULg; Blain, Pascal ULg; Renotte, Yvon ULg et al

Poster (2009)

Shearography is a growing optical technique in the field of non-destructive testing (NDT). Hololab developed an out of plane, in line and almost common path interferometer based on polarization states ... [more ▼]

Shearography is a growing optical technique in the field of non-destructive testing (NDT). Hololab developed an out of plane, in line and almost common path interferometer based on polarization states separation using a coated prism for digital phase-shifting shearography. This setup is efficient but does not allow varying the shearing direction, that is an important parameter for defects detection and quantification. To overcome this disadvantage, the coated prism is substituted by a Savart plate device that allows scanning several shearing directions by rotating the device around the light propagation axis. Many advantages of the prism substitution are discussed. The behaviour of the Savart plate as a shearing device is experimentally analyzed to optimize its integration within the interferometer. Recorded phasemaps in NDT for different shearing directions are presented. [less ▲]

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See detailThe use of Macronet resins to recover γ-decalactone produced by Rhodotorula aurantiaca from the culture broth
Alchihab, Mohamed ULg; Destain, Jacqueline ULg; Aguedo, Mario ULg et al

Poster (2009)

The objective of this study was to recover the γ-decalactone produced by R. aurantiaca from the culture broth using three Macronet resins (MN-100, MN-102 and MN-202).

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See detailReintroduction & effects on their environment of indigenous plants of the Cerrado
Buisson, Elise; Le Stradic, Soizig ULg; Negreiros, Daniel et al

Poster (2009)

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See detailDevelopment of a financial model for Geriatric Day Hospitals
Gillain, Daniel ULg; Fecher-Bourgeois, Fabienne ULg; Velghe, A. et al

Poster (2009)

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See detailThe post-harvest quality of bananas is determined by pre-harvest factors
de Lapeyre de Bellaire, Luc; Chillet, Marc; Lassois, Ludivine ULg et al

Poster (2009)

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See detailHolocene environmental changes in lake sediments from Northern Chilean Patagonia (45-48°S)
Nuttin, L.; Fagel, Nathalie ULg; Bertrand, S. et al

Poster (2009)

Detailed reference viewed: 9 (2 ULg)