References of "Scientific congresses and symposiums"
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See detailSe perfectionner en français à distance
Defays, Jean-Marc ULg

Conference (2003, September)

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See detailElevated atmospheric CO2 influences ammonia oxidiser community structure and net nitrification
Carnol, Monique ULg; Malchair, Sandrine ULg

Conference (2003, September)

The control of soil nitrogen (N) availability under elevated atmospheric CO2 is central to predicting changes in ecosystem carbon storage and primary productivity. The effects of elevated CO2 on ... [more ▼]

The control of soil nitrogen (N) availability under elevated atmospheric CO2 is central to predicting changes in ecosystem carbon storage and primary productivity. The effects of elevated CO2 on belowground processes have so far attracted limited research and they are assumed to be controlled by indirect effects through changes in plant physiology and chemistry. In this study, we investigated the effects of a 4-year exposure to elevated CO2 (ambient + 400 μmol mol-1) in open top chambers under Scots pine (Pinus sylvestris L.) on net nitrification and the community of ammonia-oxidising bacteria. Net nitrate production was significantly increased for soil from the elevated CO2 treatment in the field when incubated in the laboratory under elevated CO2, but there was no effect when incubated under ambient CO2. Net nitrate production of the soil originating from the ambient CO2 treatment in the field was not influenced by laboratory incubation conditions. These results indicate that a direct effect of elevated atmospheric CO2 on soil microbial processes might take place. Molecular analysis of the ammonia-oxidising bacteria from the same soils before laboratory incubation was investigated using a PCR-based approach targeting the 16S rRNA gene of beta-subgroup ammonia oxidisers. After specific PCR, DGGE (Denaturing Gradient Gel Electrophoresis) and sequence analysis were used to determine ammonia-oxidiser community structure. First results indicate the disappearance of Nitrosospira clusters I, II and III under elevated CO2 but also call for systematic analysis of replicates to take into account methodological and sample variability. [less ▲]

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See detailControlled whole body vibrations improve health related quality of life in elderly patients
Bruyère, Olivier ULg; Wuidart, Marc-Antoine; Di Palma, Elio et al

in Arthritis and Rheumatism (2003, September), 48(9, Suppl. S), 502

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See detailIsolation of plunc (palate, lung and nasal epithelium clone protein) in the bronchoalveolar lavage from dogs: preliminary results
Clercx, A.; Vandenbussche, G.; Ruysschaert, J. M. et al

in 13th ESVIM Meeting - Uppsala - Septembre 2003 (2003, September)

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See detailIrrigation avec les eaux usées traitées : manuel d'utilisation.
Bazza, M.; Xanthoulis, Dimitri ULg

Conference (2003, September)

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See detailEarly onset neonatal sepsis and meningitis in Belgium: a decade review
MELIN, Pierrette ULg; Maquet, Julie; Ducoffre, Geneviève et al

in American Society of Microbiology (Ed.) Program and Abstracts of the 43rd Intersciences Conference on Antimicrobial Agents and Chemotherapy (2003, September)

Background: In the late 1990s, Belgium has reached the era of “group B streptococcal (GBS) prevention” and after 1996, some institutions, but not the majority, had implemented intrapartum ... [more ▼]

Background: In the late 1990s, Belgium has reached the era of “group B streptococcal (GBS) prevention” and after 1996, some institutions, but not the majority, had implemented intrapartum antibioprophylaxis for GBS prevention. Concern exists that one unintended consequence of GBS prevention efforts through chemoprophylaxis may be an increase in the rate of serious neonatal infections due to Gram negative bacteria (GNB). To monitor trends, continued surveillance of neonatal sepsis is needed. Methods: On a weekly basis, laboratories of the Belgian sentinel network notified each case of neonatal bacteremia or meningitis occurring within 28 days after birth. We reviewed on a year-base data collected from 1991-2001 for early–onset diseases (EOD; < 5 days). Results: A yearly mean of 47 cases (24-90) were notified by 28 (16-35) laboratories. Overall GBS remained the leading cause and represented annually 37.9% (25-54.7%) of EOD and did not show significant change. It was followed by E.coli 11.4%, coagulase negative staphylococci (CNS) 11.9%, S.aureus 9.9%, Listeria sp 3.9%, S.pyogenes (GAS) 2.5%, S.pneumoniae 2.7%, H.influenzae 2.7% and others. During the decade, whereas a significant reduction in the rate of E.coli and other GNB EOD occurred (p <0.01), significant increases in the rate of EOD due to GAS (p <0.001), S.aureus (p <0.001), and CNS (p <0.01), were found. For CNS, we did not have data to distinguish definite or possible infections from contaminations. Conclusions: 1) During the last decade, GBS has remained the leading cause of neonatal EOD. 2) A decline in the rate of E.coli and other GNB infections occurred. 3) In the late 1990s, S.aureus and CNS were more frequently reported. 4) An increase in GAS occurrence was found 5) Potential change in pathogens overtime requires confirmation by ongoing surveillance. [less ▲]

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See detailRisk assessment tools for osteoporosis: Scope and limits
Richy, Florent; Gourlay, Margaret; Ross, Philip D et al

in Arthritis and Rheumatism (2003, September), 48(number 9 (suppl.)), 215

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See detailAnesthésie obstétrical et pathologie respiratoire
Brichant, Jean-François ULg

Conference (2003, September)

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See detailConvective drying of wastewater sludges: Influence of air temperature, superficial velocity and humidity on the kinetics
Léonard, Angélique ULg; Blacher, Silvia ULg; Marchot, Pierre ULg et al

in Pakowski, Zdzislaw (Ed.) X Drying Symposium, Lodz, 17-19 September 2003 (2003, September)

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See detailValidation of a shell finite element for concrete and steel structures subjected to fire
Talamona, D.; Lim, L.; Franssen, Jean-Marc ULg

in Proceedings of the 4th International Seminar on Fire and Explosion Hazards (2003, September)

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See detailInfluence of dose on the persistence of conditioned place preference induced by cocaine in C57BL/6J mice
Brabant, Christian ULg; Tirelli, Ezio ULg

in Behavioural Pharmacology (2003, September), 14(Suppl. 1), 54

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See detailOsteoporosis prevalence estimates for men: variation based on normative data
Gourlay, Margaret L; Richy, Florent; Garrett, Joanne et al

in Arthritis and Rheumatism (2003, September), 48(number 9 (suppl.)), 298

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See detailFire design of steel structures EC3
Franssen, Jean-Marc ULg

in Proceedings of the International Seminar on Fire Safety of Steel Structures (2003, September)

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See detailAntimicrobial Susceptibilities of recent clinical isolates of group B streptococci agalactiae from Belgium
MELIN, Pierrette ULg; Maquet, Julie; Rodriguez Cuns, Grisel et al

in American Society of Microbiology (Ed.) Program and Abstracts of the 43rd Intersciences Conference on Antimicrobial Agents and Chemotherapy (2003, September)

Background: : GBS cause severe infections in neonates, pregnant women and other adults. Empiric therapy is usually started before susceptibility results are available. Early neonatal diseases can be ... [more ▼]

Background: : GBS cause severe infections in neonates, pregnant women and other adults. Empiric therapy is usually started before susceptibility results are available. Early neonatal diseases can be prevented with intrapartum antibiotic prophylaxis based on accurate susceptibility surveillance data. A previous Belgian study showed an increase of 3 to 10 % R to erythromycin (EM) through the 1990s. Methods: 187 GBS isolates consecutively received at the reference laboratory between 2001 to March 2003 were from 73 neonates (52 early-onset and 21 late-onset diseases), 52 adults and 62 from pregnant women’s vagina. MICs of penicillin (PG), EM, clindamycin (CM) and gentamicin (GM) were determined with Etest. PG MBCs were also determined by inactivating the drug in MIC plates using betalactamase. EM resistant (R) isolates were tested by the CM + EM double disk to determine macrolide R phenotypes. Results: All strains were susceptible (S) to PG and no tolerance was observed with MBCs falling within 2 dilutions of MICs. 19.2% of isolates were R to EM, with significantly more R isolates from adults (30.8%; p <0.01) and serotype V (46.8%; p <0,001). 80% had the MLSB phenotype (R to EM and CM), 16 were constitutive and 12 inducible. The M phenotype (R to EM and S to CM) was seen in 7 (20%) of isolates. Less than 10% of isolates were inhibited by GM MIC of <=64 mg/L, 83.6% by 128-256 mg/L and 2.9% by >/=512 mg/L. Non typable strains were more R to GM (p <0.01). Conclusions: 1) PG remained active against all isolates and no tolerance was seen. 2) Prevalence of R to macrolides had increased since 1999, particularly in adult isolates and serotype V. 3) Intermediate to high level R to GM was seen and potential synergy of PG + GM should be investigated. 4) R surveillance is mandatory to guide prophylaxis and treatment of serious GBS infections. [less ▲]

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See detailInfluence of the section and of the insulation type on the equivalent time
Cadorin, Jean-François; Perez, Christian; Franssen, Jean-Marc ULg

in Proceedings of the 4th International Seminar on Fire and Explosion Hazards (2003, September)

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See detailRelationships between DRD2 and DAT polymorphisms and personality traits in healthy subjects
Pinto, Emmanuel ULg; Reggers, Jean ULg; Adam, Martine ULg et al

in European Neuropsychopharmacology (2003, September), 13(Suppl. 4), 427-428

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See detailHurricane Simulation on Power Transmission Line
Lilien, Jean-Louis ULg; Snegovski, Dmitri; Capelle, Thierry ULg

in Proceedings of the 5th International Conference on Cable Dynamics (2003, September)

The hurricane winds are characterized by high speeds, at which the « drag crisis » regime of flow around cable is achievable. That is why, in the calculation of the wind-induced movement of the overhead ... [more ▼]

The hurricane winds are characterized by high speeds, at which the « drag crisis » regime of flow around cable is achievable. That is why, in the calculation of the wind-induced movement of the overhead transmission line during hurricane, it is important to represent the cable aerodynamic drag as Reynolds-dependent. In order to assess the behaviour and fatigue resistance of the transmission line conductor under hurricane conditions, the Reynolds-dependent drag coefficient was introduced in the SAMCEF Mecano finite-element software. To represent the hurricane wind loading, the turbulent, spatially non-uniform wind model was used. Results of comparative study of the smooth cable AERO-Z and the classical multistrand cable, including the percentage of load reduction offered to supporting structure, are presented. [less ▲]

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See detailOptimisation de l'irrigation localisée avec les eaux usées traitées.
Chenini, F.; Penadille, Y.; Xanthoulis, Dimitri ULg et al

Conference (2003, September)

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See detailWastewater recycling of olive mills in Mediterranean countries : Demonstration and sustainable reuse of residuals.
Herold, D.; Jullich, U.; Neskakis, A. et al

Conference (2003, September)

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See detailA projective approach to handle 3D spatial data
Billen, Roland ULg

Poster (2003, September)

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See detailBiogeochemistry of the Scheldt estuary and plume
Sirjacobs, Damien ULg; Shimoni, Michal; Borges, Alberto ULg et al

Conference (2003, September)

Detailed reference viewed: 28 (13 ULg)
See detailReconstructing atolls from the Frasnian of Belgium
Boulvain, Frédéric ULg; Cornet, Pierre; Da Silva, Anne-Christine ULg et al

Conference (2003, September)

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See detailOn the development of a model updating strategy of nonlinear vibrating structures
Kerschen, Gaëtan ULg; Golinval, Jean-Claude ULg

in ASME International Design Engineering Technical Conferences, Chicago, 2003 (2003, September)

The objective of this paper is to present a model updating strategy of non-linear vibrating structures. Because modal analysis is no longer helpful in non-linear structural dynamics, a special attention ... [more ▼]

The objective of this paper is to present a model updating strategy of non-linear vibrating structures. Because modal analysis is no longer helpful in non-linear structural dynamics, a special attention is devoted to the features extracted from the proper orthogonal decomposition and one of its non-linear generalisations based on auto-associative neural networks. The efficiency of the proposed procedure is illustrated using simulated data from a three-dimensional portal frame. [less ▲]

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See detailEtude de l’influence d’un nouveau mobile d’agitation sur le transfert d’oxygène et la production de xylanases par Penicillium canescens
Bakri, Y.; Jacques, Ph.; Shi, L. et al

Poster (2003, September)

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See detailPrevention of human errors
Nyssen, Anne-Sophie ULg

Conference (2003, September)

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See detailComparative study of different lipases acting on milk fat globule membrane monolayers.
Danthine, Sabine ULg; Blecker, Christophe ULg; Deroanne, Claude

Poster (2003, September)

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See detailL'implantation: premier dialogue entre la mère et l'embryon
Geenen, Vincent ULg

Conference (2003, September)

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See detailEfficacy of alphacalcidol and calcitriol in primary and corticosteroid-induced osteoporosis: a meta-analysis of their effects on bone mineral density and fracture rate
Richy, Florent Y; Reginster, Jean-Yves ULg

in Arthritis and Rheumatism (2003, September), 48(number 9 (suppl.)), 214

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See detailFive-year follow-up of patients from a previous 3-year randomised, controlled trial of glucosamine sulfate in knee osteoarthritis
Bruyère, Olivier ULg; Compere, Stephanie; Rovati, Lucio C et al

in Arthritis and Rheumatism (2003, September), 48(number 9 (suppl.)), 80

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See detailFamilial isolated pituitary adenomas (FIPA) : not only acromegaly
Jaffrain-Réa, M. L.; Tamburrano, G.; Ciccarelli, A. et al

in 30 Congresso Nazionale della Socièta Italiana di Endocrinologia : Milano, 24-27 settembre 2003 (2003, September)

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See detailEfficience et bilan de l'azote apporté par l'engrais et par les eaux usées traitées.
Khelil, M. N.; Rejeb, S.; Destain, Jean-Pierre ULg et al

Conference (2003, September)

Detailed reference viewed: 27 (1 ULg)
See detailRaloxifene protects Osteoblasts from apoptosis induced by sodium nitroprusside: Potential involvement of ceramide
Olivier, Sabine ULg; Fillet, Marianne ULg; Malaise, Michel ULg et al

in Journal of Bone and Mineral Research (2003, September), 18(Suppl. 2), 136

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See detailCombustion control by means of a photodiode
Ngendakumana, Philippe ULg; Tartari, Paula

in Proceedings of the 25th Task Leaders Meeting (TLM) of the IEA Implementing Agreement "Energy Conservation and Emissions Reduction in Combustion" (2003, September)

The objective of this work was to assess the feasibility of a photodiode to control combustion, instead of a spectrometer (which is an expensive sensor to be used in commercial burners). For that purpose ... [more ▼]

The objective of this work was to assess the feasibility of a photodiode to control combustion, instead of a spectrometer (which is an expensive sensor to be used in commercial burners). For that purpose, the flame emission has been measured in a hot-water boiler fired with light fuel-oil, whose nominal output power goes up to 370 kW. The parameters investigated were: overall air excess, combustion air distribution, burner power and atmospheric conditions. High influence of air distribution on the flame emission was detected by the diode, since it modifies directly the mixing quality reducing rich-fuel regions where soot can be formed. Low influence of air excess and burner power was found. When these parameters increase, the flame emission decreases. This behavior is explained by the better mixing attained at high burner power and at high air excess. However the high emission level observed at low firing rate can be reduced with a good burner adjustment. With the photodiode, it was possible to find the optimum air excess value where NO, CO and soot are as low as possible. As the photodiode measures locally in the flame, results were compared with images obtained with a CCD camera. Finally, these results are in good agreement with those obtained previously with the spectrometer. [less ▲]

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See detailClinical comparison between nasopharyngeal, oropharyngeal and laryngopharyngeal disorders in dogs and cats: a review of 80 cases.
Billen, Frédéric ULg; Peeters, Dominique ULg; Day, Michael et al

in Proceedings of the 13th ECVIM-CA Congress (4-6/09/2003), Uppsala, Sweden (2003, September)

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See detailGabazine (SR95531) effect on memory consolidation and context-dependent memory in mice
Bernaerts, R.; Tirelli, Ezio ULg

in Behavioural Pharmacology (2003, September), 14(Suppl. 1), 29

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See detailInterleukin-1beta and tumor necrosis factor-alpha enhance the shedding of Interleukin-6 receptor in osteoblastic cells: Involvement of tumor necrosis factor-alpha converting enzyme
Franchimont, N. M.; Lambert, Cecile; Ribbens, Clio ULg et al

in Arthritis and Rheumatism (2003, September), 48(9, Suppl. S), 482

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See detailMoisture profiles determination during convective drying using X-ray microtomography
Léonard, Angélique ULg; Blacher, Silvia ULg; Marchot, Pierre ULg et al

in Proceedings of the 3rd World Congress on Industrial Process Tomography, Banff, Canada (2003, September)

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See detailUse of X-ray microtomography to determine internal moisture profiles during convective drying of deformable materials
Léonard, Angélique ULg; Blacher, Silvia ULg; Marchot, Pierre ULg et al

in Saravacos, G.; Maroulis, Z. B.; Krokida, M. (Eds.) et al Proceedings of the European Drying Symposium - EuDrying03 (2003, September)

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See detailStructural and symptomatic efficacy of glucosamine and chondroitine sulfate in osteoarthritis: a comprehensive meta-analysis
Richy, Florent Y; Bruyère, Olivier ULg; Ethgen, Olivier ULg et al

in Arthritis and Rheumatism (2003, September), 48(number 9 (suppl.)), 214

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See detailIdentification of the signalling pathways required for interleukin-1 beta stimulation of osteoprotegerin synthesis in osteoblastic cells
Lambert, Cecile; Ribbens, Clio ULg; Bours, Vincent ULg et al

in Journal of Bone and Mineral Research (2003, September), 18(Suppl. 2), 142

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See detailQualitative and quantitative criteria for comfortable urban public spaces
Reiter, Sigrid ULg; De Herde, André

in Carmeliet, Jan; Hens, Hugo; Vermeir, Gerrit (Eds.) Research in building physics. Proceedings of the 2nd International Conference on Building Physics (2003, September)

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See detailLOVECLIM, a three-dimensional model of the Earth system for investigating long-term climate changes
Driesschaert, E.; Brovkin, V.; Fichefet, T. et al

Conference (2003, September)

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See detailStress echocardiography in horses: comparison of cardiac output during incremental dobutamine infusion in atropinised and non-atropinised ponies
Sandersen, Charlotte ULg; Detilleux, Johann ULg; Delguste, Catherine ULg et al

in Proceedings of the 42d Annual Congress of the British Equine Veterinairy Association (2003, September)

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See detailQuasi 2D-numerical model of aerated flow over stepped chutes
Dewals, Benjamin ULg; André, Stéphanie

Conference (2003, August 29)

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See detailRadiochemical Synthesis of p-[18F]Desmethyl-MPPF (p-[18F]D-MPPF) for the Study of 5-HT1A Receptors
Defraiteur, Caroline; Plenevaux, Alain ULg; Lemaire, Christian ULg et al

in Journal of Labelled Compounds & Radiopharmaceuticals (2003, August), 46(S1), 157

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See detailAcoustic-emission investigations on the austenite decomposition in a medium-carbon steel
Mertens, Anne ULg; van Bohemen, S. M. C.; Hermans, M. J. M. et al

in Militzer, M.; Poole, W. J.; Essadiqi, E. (Eds.) Proceedings of the International Symposium on Transformation and Deformation Mechanisms in Advanced High-Strength Steels (2003, August)

Continuous cooling of the austenitic phase is important in controlling the microstructure and properties of steel. At high cooling rates, the initial formation of allotriomorphic ferrite undergoes a ... [more ▼]

Continuous cooling of the austenitic phase is important in controlling the microstructure and properties of steel. At high cooling rates, the initial formation of allotriomorphic ferrite undergoes a transition to bainite and martensite. Modelling and understanding the transformation process does therefore not only involve the ferrite formation, but also the bainite and martensite formation, and especially the mechanisms of phase formation and the conditions at which the transition occurs. In the present study the acoustic-emission technique is used to obtain more information on the varying transformationprocesses in different temperature regimes. The experimental results are combined with dilatometry and metallographic data in order to gain a full view of the transformation processes and kinetics. [less ▲]

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See detailIsolation of bacteriocin-producing lactic acid bacteria from fermented fish product in Senegal.
Dortu, C.; Roblain, D.; Totte, A. et al

Poster (2003, August)

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See detailIce storage (ISS) : simulation of a typical HVAC primary plant equipped with an ice storage unit.
Adam, Ch.; Andre, Philippe ULg

(2003, August)

Within the framework of energy management in a tertiary building, it is necessary to evaluate the possibilities of cold energy storage. This study includes the consideration of ice storage for the ... [more ▼]

Within the framework of energy management in a tertiary building, it is necessary to evaluate the possibilities of cold energy storage. This study includes the consideration of ice storage for the airconditioning of the buildings. To compare objectively the operating strategies, the manager needs to reproduce the ISS performances for the same conditions (building, cooling and electrical demands, climate conditions,...). He needs also informations to chose the appropriate plant configuration or operating strategy to meet the global cooling demand taking into account the characteristics of the tank, of the demand curve,... at each moment. A simulation model of an entire HVAC primary plant should provide this information. This paper focuses on the adaptation of a latent storage model to an example of ISS. In order to validate the model the results of the simulation are compared to the performances of a small-size. [less ▲]

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See detailDifferent approaches for the simulation of an experimental building hosting a climate chamber devote to artificial fog production
Andre, Philippe ULg; Kelly, N.; Boreux, Jean-Jacques ULg et al

(2003, August)

In the context of a european project dealing with the issue of transport safety improvement in fog conditions, an experimental building has been constructed on the FUL campus, in the southern part of ... [more ▼]

In the context of a european project dealing with the issue of transport safety improvement in fog conditions, an experimental building has been constructed on the FUL campus, in the southern part of Belgium. This building hosts a climatic chamber in which a given indoor climate is to be maintained (temperature and relative humidity) whatever the external climate, in order to promote the artifical production of fog by water droplets spraying. During the design of the building and of the HVAC plant, different simulation approaches were carried out in order to evaluate and possibly optimize the technical choices concerning: - the building envelope - the material for the climatic chamber - the control strategy of the HVAC system Two categories of simulation tools were used to solve the different tasks: - building simulation tools - CFD programs For the first category, simulations were performed using both ESP-r and TRNSYS with the objective of solving the following questions: optimization of the building envelope (orientation and shading of the building, insulation, fenestration); sizing of the HVAC system; comparison of control strategies (direct control, indirect control, radiative and/or convective conditioning); estimation of energy consumption and comfort Within the second category, the FLUENT and ESP-r software were used and compared in order to predict the homogeneity of the thermal state within the test room and to calculate the effect of injecting a high amount of small water droplets on fog production, maintenance and visibility. Therefore, the ESP-r CFD module program was augmented with a specific model of water droplet diffusion. The paper will tackle the main modelling assumptions at the basis of each simulation experiment, the data preparation and the results of the calculations. For each phase, advantages and limitations of the simulation approach will be highlighted. These developments are considered as a first step towards the implementation of a virtual testing environment in the field of automotive transport which could be complemented by additional issues dealing with passengers comfort, acoustics, air quality, level of illuminance generated by the virtual production of fog. [less ▲]

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See detailStudy of the biodiversity of spore forming lactic bacteria and their technological properties.
Bayane, A.; Roblain, D.; Antoine, P. et al

Poster (2003, August)

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See detailAn efficient decentralized on-line traffic engineering algorithm for MPLS networks
Blanchy, François; Mélon, Laurent; Leduc, Guy ULg

in Providing Quality of Service in Heterogeneous Environments (2003, August)

Multi-Protocol Label Switching (MPLS) provides ways to control the Label Switched Paths (LSPs) followed by traffic trunks in a network and thereby to better traffic engineer it. In this context, we look ... [more ▼]

Multi-Protocol Label Switching (MPLS) provides ways to control the Label Switched Paths (LSPs) followed by traffic trunks in a network and thereby to better traffic engineer it. In this context, we look at the problem of organizing the mapping of LSPs in an optimal way throughout the network on the basis of a given objective function. This problem is highly combinatorial and makes dynamic and real-time features a difficult issue for any LSP routing scheme. For this reason, we propose a computationally efficient, though approximate, on-line scheme adapted to an incremental optimization of the network state. It is then applied to a seldom mentioned traffic engineering problem: the compromise between load-balancing and traffic minimization. It is expected that clever routing strategies to balance the network load will sometimes favor longer paths in order to avoid congestion, leading to an increase of the overall network utilization. This reasoning is confirmed by our study, and we show that an improvement in network management can be made by appropriately tuning this compromise. [less ▲]

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See detailRuthenium N-heterocyclic carbene complexes: Versatile catalysts precursors for olefin metathesis, olefin cyclopropanation, and radical reactions
Demonceau, Albert ULg; Richel, Aurore ULg; Delfosse, Sébastien et al

Conference (2003, August)

N-heterocyclic carbenes are divalent carbon species, which are commonly used as neutral, two-electron ligands with a negligible p-back-bonding tendency. They behave as phosphine mimics, yet they are ... [more ▼]

N-heterocyclic carbenes are divalent carbon species, which are commonly used as neutral, two-electron ligands with a negligible p-back-bonding tendency. They behave as phosphine mimics, yet they are better s-donors and they form stronger bonds to metal centres than most phosphines. Their electronic and steric properties are liable to ample modification simply by varying the substituents on the nitrogen atoms. Therefore, N-heterocyclic carbenes constitute a promising new class of ligands available for catalyst engineering and fine tuning, and a great deal of attention has been paid to them recently. We found that the 18-electron complex RuCl2(p-cymene)(PCy3) was a versatile and efficient promoter for the ring-opening metathesis polymerisation of both strained and low-strain cyclic olefins when activated by a suitable carbene precursor such as trimethylsilyl-diazomethane. RuCl2(p-cymene)(PCy3) was also an excellent catalyst for ATRP (Atom Transfer Radical Polymerisation) of methyl methacrylate and styrene. Here, we present preliminary results obtained in olefin metathesis, olefin cyclopropanation, and radical reactions (ATRP and Kharasch addition) when tricyclohexylphosphine was substituted by an N-heterocyclic ligand. [less ▲]

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See detailComprehensive Analysis of PBDEs, PCDD/Fs and PCBs
PIRARD, Catherine ULg; De Pauw, Edwin ULg; Focant, Jean-François ULg

Conference (2003, August)

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See detailLifting of valid inequalities revisited
Louveaux, Quentin ULg

Conference (2003, August)

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See detailHow Daphnia maintain its homeostasis
Darchambeau, François ULg; Thys; Descy, Jean-Pierre et al

Conference (2003, July 16)

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See detailRecent progress in ring-opening of ε-caprolactone and derivatives
Lecomte, Philippe ULg; Jérôme, Robert ULg

Conference (2003, July 02)

This oral communication was presented by Philippe Lecomte

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See detail2-oxepane-1,5-dione: a precursor of a novel class of versatile semicrystalline biodegradable (co)-polyesters
Lecomte, Philippe ULg; Latere Dwan'Isa, Jean-Pierre; Dubois, Philippe et al

Poster (2003, July 01)

2-oxepane-1,5-dione (OPD) was synthesized by Baeyer-Villiger oxidation of 1,4-cyclohexanedione and ring-opening polymerized by 1-phenyl-2-propanol / tin octoate with formation of a semicrystalline ... [more ▼]

2-oxepane-1,5-dione (OPD) was synthesized by Baeyer-Villiger oxidation of 1,4-cyclohexanedione and ring-opening polymerized by 1-phenyl-2-propanol / tin octoate with formation of a semicrystalline polyester of high melting temperature (Tm: 147°C). A crystallographic study showed that the polyester is orthorombic in the P212121 space with two molecules extended along the c-axis as is the case for poly(ε-caprolactone) (PCL). Dibutyltin dimethoxide and 2,2-dibutyl-2-stanna-1,3-dioxepane (DSDOP) proved to be efficient initiators for the random copolymerization of ε-caprolactone (εCL) and OPD. Random distribution of the comonomer units was confirmed by DSC, 1H and 13C NMR analyses. A single Tm was observed, which varies regularly and monotonically with the OPD content as result of a cocrystallisation phenomenon. The single glass transition temperature (Tg) obeys the Fox equation. It is noteworthy that a copolymer containing 30 mol % OPD exhibits a Tm of 90°C. It is stable up to 140°C under nitrogen for one hour, such that processing by extrusion is quite possible. The OPD decomposition is maximum at 223°C for a heating rate of 10°C/min. The mechanism of thermal degradation was investigated and cleared up. The ketone increases the copolymer hydrophilicity and thus sensitivity to hydrolysis. The mechanical properties are quite reminiscent of PCL of comparable molecular weight. Quite interestingly, OPD imparts sensitivity to photo-cross-linking to this novel class of materials. [less ▲]

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See detailA model reduction method for the control of rigid mechanisms
Bruls, Olivier ULg; Duysinx, Pierre ULg; Golinval, Jean-Claude ULg

in Proceedings of the ECCOMAS Conference on Advances in Computational Multibody Systems (2003, July)

This paper proposes a control strategy for flexible mechanisms. Our starting-point is a classical collocated PID control of the joint actuators designed for the equivalent rigid mechanism. An additional ... [more ▼]

This paper proposes a control strategy for flexible mechanisms. Our starting-point is a classical collocated PID control of the joint actuators designed for the equivalent rigid mechanism. An additional state feedback is implemented to control the flexible modes. On the basis of a few vibration measurements, it generates an additional command for the joint actuators. This non-collocated control scheme is designed according to the H procedure in order to have robust performances and stability with respect to configuration changes. In this paper, a new reduction methodology is presented to build a linear low-order and sufficiently accurate model of the mechanism with the PID feedback, which is suitable for the design of the H controller. First, a detailed Finite Element model of the mechanism is elaborated including the initial PID compensator. This set of nonlinear differential and algebraic equations is then linearized around a chosen reference configuration and a reduction technique is developed to extract a compact set of ordinaray differential equations. The retained degrees of freedom are the joint coordinates and a few modal coordinates representing the deformation of the whole mechanism. The kinematic description is thus decomposed into two parts, a rigid body motion described by the joint coordinates and a flexible motion for which shape functions have to be selected. For this selection, a modal analysis of the controlled mechanism is performed and the first few modes are kept, as in the Craig-Bampton or McNeal-Rubin reduction techniques. For robust performance specifications, the variations of the model with respect to the configuration changes should be estimated. Thus, the reduction procedure is realized for a few values of the joint coordinates, and the reduced models are compared. As the set of shape functions changes with the configuration, the physical meaning of the modal coordinates should be reinterpreted in each model, which is one difficulty of the approach. To illustrate the method, the case of a two-link flexible manipulator is presented. Simulation of the complete nonlinear Finite-Element model with the global control scheme is performed in order to assess the final performances of the closed-loop system. [less ▲]

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See detailNumerical Simulation of High Drag Reduction Regime in Polymer Solutions
Dubief, Yves; White, Christopher M.; Terrapon, Vincent ULg et al

in Proceedings of the 4th ASME/JSME Joint Fluids Engineering Conference; No FEDSM2003-45652 (2003, July)

The simulation of drag reduced channel flows has to rely on consitituve models such as FENE-P. Their implementation is not straightforward to achieve convergence and stability of the solution. This paper ... [more ▼]

The simulation of drag reduced channel flows has to rely on consitituve models such as FENE-P. Their implementation is not straightforward to achieve convergence and stability of the solution. This paper discusses the problem of advection embedded in the FENE-P equation and the issue of the domain size. Finally we present results of simulations for High Drag Reduction regime, and show the subsequent modification of the vortical structures. [less ▲]

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See detailTowards tissue-selective KATP channel openers
Lebrun, P.; Antoine, M. H.; Dabrowski, M. et al

Poster (2003, July)

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See detailHybrid Acceleration using Real Vector Automata
Boigelot, Bernard ULg; Herbreteau, Frédéric; Jodogne, Sébastien ULg

in Lecture Notes in Computer Science (2003, July), 2725

This paper addresses the problem of computing an exact and effective representation of the set of reachable configurations of a linear hybrid automaton. Our solution is based on accelerating the state ... [more ▼]

This paper addresses the problem of computing an exact and effective representation of the set of reachable configurations of a linear hybrid automaton. Our solution is based on accelerating the state-space exploration by computing symbolically the repeated effect of control cycles. The computed sets of configurations are represented by Real Vector Automata (RVA), the expressive power of which is beyond that of the first-order additive theory of reals and integers. This approach makes it possible to compute in finite time sets of configurations that cannot be expressed as finite unions of convex sets. The main technical contributions of the paper consist in a powerful sufficient criterion for checking whether a hybrid transformation (i.e., with both discrete and continuous features) can be accelerated, as well as an algorithm for applying such an accelerated transformation on RVA. Our results have been implemented and successfully applied to several case studies, including the well-known leaking gas burner, and a simple communication protocol with timers. [less ▲]

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See detailContribution to the phylogeography of the garden dormouse (Eliomys quercinus)
Libois, Roland ULg; Michaux, J; Ramalhinho, Maria da Graça et al

in Macholan, Milos; Bryja, Josef; Zima, Jan (Eds.) European Mammalogy 2003 (2003, July)

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See detailBrownian dynamics simulation in a turbulent channel flow
Terrapon, Vincent ULg; Dubief, Yves; Moin, Parviz et al

in Proceedings of the 4th ASME/JSME Joint Fluids Engineering Conference; No FEDSM2003-45680 (2003, July)

The dynamics of different bead-spring models is investigated in a turbulent channel flow. In particular, the FENE, the FENE-P and the FENE multichain models are compared. In the case of the FENE-P model ... [more ▼]

The dynamics of different bead-spring models is investigated in a turbulent channel flow. In particular, the FENE, the FENE-P and the FENE multichain models are compared. In the case of the FENE-P model, both the Brownian Dynamics and the constitutive equations are used. It is shown that the different models produce qualitatively similar results for the mean extension and the mean stresses. This qualitative behaviour is also reproduced for different extensibility parameters. It is also found that the action of polymers is confined in the near wall region where the polymers are mainly oriented in the streamwise direction. [less ▲]

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See detailLimit Cycle Prediction For Subsonic Aeroelastic Systems Using Nonlinear System Identification
Dimitriadis, Grigorios ULg; Vio, Gareth Arthur; Cooper, Jonathan Edward

in Ferman, M. A.; Petersson, B. A. T.; Rizzi, S. A. (Eds.) et al Proceedings of the VIII International Conference on Recent Advances in Structural Dynamics (2003, July)

The prediction of aeroelastic instabilities caused by nonlinear unsteady aerodynamic forces acting on aircraft has recently become an important area of research. Emphasis is placed on the capability to ... [more ▼]

The prediction of aeroelastic instabilities caused by nonlinear unsteady aerodynamic forces acting on aircraft has recently become an important area of research. Emphasis is placed on the capability to predict the occurrence of Limit Cycle Oscillations (LCOs) at both the design and prototype testing stages. In this paper, the prediction of LCOs is attempted for a simulated aeroelastic system subjected to nonlinear subsonic unsteady aerodynamic forces, using system identification. Response data from the simulated system are curve-fitted by means of a series of polynomial basis functions. This approach yields very accurate identified models of the actual system at individual flight conditions. These identified models are extrapolated to a global aeroelastic identified model. Using this model, the flight conditions at which LCOs occur is accurately predicted but the amplitude of the oscillations is underestimated. [less ▲]

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See detailDesign of an undervoltage load shedding scheme for the Hydro-Québec system
Lefebvre, Daniel; Moors, Cédric; Van Cutsem, Thierry ULg

(2003, July)

This paper deals with the control logic of an undervoltage, closed-loop load shedding scheme aimed at protecting the Hydro-Quebec system against long-term voltage instability. This scheme relies on a set ... [more ▼]

This paper deals with the control logic of an undervoltage, closed-loop load shedding scheme aimed at protecting the Hydro-Quebec system against long-term voltage instability. This scheme relies on a set of "if-then" rules whose parameters are determined through combinatorial optimisation, relying on the system dynamic response over a set of scenarios. Preliminary results of the above optimisation technique are given, besides a brief description of the foreseen implementation. [less ▲]

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See detailReverse-logic control of load tap changers in emergency voltage conditions
Otomega, Bogdan; Sermanson, Vincent; Van Cutsem, Thierry ULg

(2003, June 26)

This papers deals with the emergency control of Load Tap Changers (LTCs) to face low transmission voltages or voltage instability situations. The proposed simple control logic consists in reverting the ... [more ▼]

This papers deals with the emergency control of Load Tap Changers (LTCs) to face low transmission voltages or voltage instability situations. The proposed simple control logic consists in reverting the tap movements once the voltage at a monitored transmission bus falls below some threshold. A deadband on this voltage allows the system to settle down in between the normal and reverse logic modes. In order to control a large number of LTCs, the latter are divided into clusters, each with its own monitored voltage. The paper also considers the control of two levels of LTCs in cascade, where proper coordination is required between the two levels. The proposed scheme has been tested on a detailed EHV-HV-MV planning model of the Western region of the French transmission system operated by RTE. Long-term time responses to major disturbances are shown to illustrate the performance of the proposed scheme. [less ▲]

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See detailOn-Line Voltage Security Assessment of the Hellenic Interconnected System
Vournas, Costas; Manos, George; Kabouris, John et al

(2003, June 26)

This paper describes the on-line Voltage Security Assessment environment developed within the framework of the EU-sponsored OMASES project, as well as its application to the Greek Interconnected Power ... [more ▼]

This paper describes the on-line Voltage Security Assessment environment developed within the framework of the EU-sponsored OMASES project, as well as its application to the Greek Interconnected Power System. The heart of all computations is a fast time-domain method. Security is analyzed with respect to power transfers in critical corridors or power consumption in load areas. Results take on the form of either precontingency secure operation limits, or post-contingency loadability limits, together with various diagnosis tips. Typical results obtained during the test phase of the project are reported. [less ▲]

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See detailOMASES: A DYNAMIC SECURITY ASSESSMENT TOOL FOR THE NEW MARKET ENVIRONMENT
Bihain, André; Cirio, Diego; Fiorina, Mario et al

(2003, June 26)

The paper presents the efforts and results of a large consortium of European Industries, Research Centers and Universities involved in an EU research project named OMASES in the field of Power System ... [more ▼]

The paper presents the efforts and results of a large consortium of European Industries, Research Centers and Universities involved in an EU research project named OMASES in the field of Power System Dynamic Security Assessment (DSA). The overall structure of an on-line DSA tool including TSA – Transient Stability Assessment, VSA – Voltage Stability Assessment, TS – Training Simulator and MS – Market Simulator is reported. Some basic assumptions and methodological aspects of the tool are presented considering its possible use within actual or future Energy Management Systems under the new electric market environment. Scenarios set up for the validation phase and results are reported with reference to the Italian test facility. [less ▲]

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See detailAccueil et accompagnement des spectateurs: Le Fan coaching
Comeron, Manuel ULg

Conference (2003, June 24)

Préparation et l’organisation de grandes manifestations sportives par les autorités locales et régionales en Europe: S’agissant de la sécurité dans et aux alentours des stades, conception et entretien des ... [more ▼]

Préparation et l’organisation de grandes manifestations sportives par les autorités locales et régionales en Europe: S’agissant de la sécurité dans et aux alentours des stades, conception et entretien des stades, coordination entre les différents services et les niveaux d’autorités impliqués (national, régional, local) ; rôle des médias dans la gestion et la prévention des crises ; rôle du personnel d’encadrement (stadiers) à l’intérieur des stades pour prévenir la violence (formation); répartition des places dans les stades (séparation des spectateurs d’équipes rivales) par un système de contrôle et de vente des billets ; Concernant l’accueil et l’accompagnement des spectateurs : encadrement des spectateurs : par des stands d’accueil des supporters visiteurs dans les villes d’accueil « Ambassades de supporters » ; par un accompagnement socio-éducatif permanent des supporters (« fan-coaching ») ; enseignements des « bonnes pratiques » diffusées dans le cadre du Réseau européen « EUROFAN » ; S’agissant de la participation de la population locale, conception associant la population locale à des animations socio-culturelles dans les villes d’accueil. [less ▲]

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See detailA set of efficient numerical tools for floodplain modelling
Dewals, Benjamin ULg

Conference (2003, June 17)

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See detailIntérêt du dosage des glycoprotéines associées à la gestation (PAGs), comparés à la progestérone, dans le diagnostic de la gestation chez la chèvre bédouine
Charallat-Chérif, S; Sulon, J; Amirat, Z et al

in Intérêt du dosage des glycoprotéines associées à la gestation (PAGs), comparés à la progestérone, dans le diagnostic de la gestation chez la chèvre bédouine (2003, June 17)

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See detailDiane Project: Women’s Entrepreneurship
Constantinidis, Christina ULg; Cornet, Annie ULg

Conference (2003, June 16)

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See detailRadiosynthèses d'antagonistes des récepteurs 5-HT1A.
Defraiteur, C.; Plenevaux, Alain ULg; Lemaire, Christian ULg et al

Poster (2003, June 13)

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See detailRadiosynthèse de dérivés du 7-[18F]fluoroindole
Otabashi, Muhammad ULg; Giacomelli, Fabrice ULg; Lemaire, Christian ULg et al

Poster (2003, June 13)

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See detailMise au point de sondes pour l'étude du système sérotoninergique par tomographie à émission de positons (TEP)
Giacomelli, Fabrice ULg; Lemaire, Christian ULg; Plenevaux, Alain ULg et al

Poster (2003, June 13)

La quantification de la vitesse de biosynthèse de la sérotonine ainsi que l'étude in vivo chez l'homme sont, du fait de l'implication cruciale des neurones sérotoninergiques dans de nombreuses fonctions ... [more ▼]

La quantification de la vitesse de biosynthèse de la sérotonine ainsi que l'étude in vivo chez l'homme sont, du fait de l'implication cruciale des neurones sérotoninergiques dans de nombreuses fonctions et pathologies cérébrales, des domaines d'études fondamentaux pour lesquels la TEP constitue un outil de choix. Ces différentes expérimentations peuvent être conduites suivant deux optiques: (i) emploi d'un traceur capable de suivre la chaîne métabolique du tryptophane conduisant à la sérotonine tout en évitant les autres voies métaboliques. (ii) utilisation d'un inhibiteur de la tryptophane hydroxylase (TPOH), enzyme limitante du processus. [less ▲]

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See detailTrophic links in the lowland river Meuse (Belgium): importance of the predation exerted by rotifers on bacterio- and protozooplankton.
Joaquim-Justo, Célia ULg; Pirlot, S; Viroux, Laurent et al

Conference (2003, June 07)

Trophic interactions within the plankton of the lowland river Meuse (Belgium) were measured in Spring and Summer (2001). Consumption of bacteria by protozoa was measured by monitoring the radioactivity ... [more ▼]

Trophic interactions within the plankton of the lowland river Meuse (Belgium) were measured in Spring and Summer (2001). Consumption of bacteria by protozoa was measured by monitoring the radioactivity disappearance of 3H-thymidine labelled bacteria. The proportion of protozoan bacterivory attributable to flagellates and ciliates was determined with fluorescently labelled bacteria (FLB). Metazooplankton bacterivory was assessed with 0.5 µm fluorescent microparticles (FMPs) and predation of metazooplankton on ciliates was measured by using natural ciliate assemblages labelled with FMPs as tracer food. Grazing of metazooplankton on flagellates was determined through in situ incubations with manipulated metazooplankton densities. flagellates were the main bacterial consumers their grazing being 91  10 % of total bacterial grazing. Metazooplankton, essentially rotifers, grazing on bacteria was negligible compared to grazing by protozoa and to bacterial production. Protozoa grazing balanced bacterial production in early samplings but was lower in July. Predation of rotifers on heterotrophic flagellates (HF) was generally low (1.765 3.432 mg C m-3 d-1 ), the higher contribution of HF in the diet of rotifers being observed when Keratella cochlearis was the dominant metazooplankter. Predation of rotifers on ciliates was low in the first samples (0.557  0.004 mg C m-3 d-1) in contrast to measurements performed in July (8.722  1.363 mg C m-3d-1). The proportion of protozoa in the diet of rotifers was generally low compared to phytoplankton (< 30% of total carbon ingestion) except when phytoplankton biomass decreased below the incipient limiting level (ILL) of the main metazooplantonic species. In such conditions, protozoa (mainly ciliates) constituted ca. 50% of total rotifer food. These results give evidence that microbial organisms play an important role within the plankton of the river Meuse, ciliates providing an alternative food for metazooplankton when phytoplankton becomes scarce. [less ▲]

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See detailHypertension artérielle et risque cardio-vasculaire
Krzesinski, Jean-Marie ULg

Conference (2003, June 05)

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