Publications ORBi OA
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See detailConcentration of Polybrominated Diphenyl Ethers (PBDEs) in house hold dust from various countries - inhalation a potential route of human exposure
Sjödin; Päpke, Olaf; McGaheeIII, Ernest et al

in Organohalogen Compounds (2004), 66

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See detailAre MDRD formulas better than Cockcroft formula for the prediction of glomerular filtration rate in obese patients?
Delanaye, Pierre ULg; Saint-Remy, Annie ULg; Rorive, Marcelle ULg et al

in European Renal Association, XLI COngress Lisbon, Abstract book (2004)

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See detailAssessment of the impact of an old MSWI. Part1 : Level of PCDD/Fs and PCBs in surrounding soils and eggs
Pirard, Catherine; Focant, Jean-François ULg; Massart, Anne-Cécile ULg et al

in Organohalogen Compounds (2004), 66

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See detailMeasurement of dioxins and WHO PCBs in foodstuffs using GCxGC-IDTOFMs
Focant, Jean-François ULg; Pirard, Catherine; Massart, Anne-Cécile ULg et al

in Organohalogen Compounds (2004), 66

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See detailImproved separation and quantification of dioxin and furan congeners using Novel low-bleed capillary gas chromatography columns and mass spectrometry
Dorman, Frank; Reese, Shawn; Reiner, Eric et al

in Organohalogen Compounds (2004), 66

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See detailContribution of tobacco smoking to dioxin accumulation: opposite effects according to gender
Fierens, Sébastian; Eppe, Gauthier ULg; Focant, Jean-François ULg et al

in Organohalogen Compounds (2004), 66

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See detailControl of listeria monocytogenes in dairy farms
Belleflamme, Christel ULg; Di Tanna, Sybille ULg; Anceau, Christine ULg et al

in Proceedings of the Ninth Conference on Food Microbiology (2004)

- Performed in Walloon farms in contact with the PDR project - L. monocytogenes characterised by its ubiquity - Numerous sources of contaminations : environment, cross-contaminations, post-contaminations ... [more ▼]

- Performed in Walloon farms in contact with the PDR project - L. monocytogenes characterised by its ubiquity - Numerous sources of contaminations : environment, cross-contaminations, post-contaminations, mastitis,… [less ▲]

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See detailRenormalization prescriptions and bootstrap in effective theories
Vereshagin, Vladimir; Semenov-Tyan-Shanskiy, Kirill ULg; Vereshagin, Alexander

in High energy physics and quantum field theory. Proceedings, 18th International Workshop, QFTHEP 2004, St. Petersburg, Russia, June 17-23, 2004 (2004)

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See detailCubically convergent iterations for invariant subspace computation
Absil, P.-A.; Sepulchre, Rodolphe ULg; Van Dooren, P. et al

in SIAM Journal on Matrix Analysis and Applications (2004), 26(1), 70-96

We propose a Newton-like iteration that evolves on the set of fixed dimensional subspaces of R-n and converges locally cubically to the invariant subspaces of a symmetric matrix. This iteration is ... [more ▼]

We propose a Newton-like iteration that evolves on the set of fixed dimensional subspaces of R-n and converges locally cubically to the invariant subspaces of a symmetric matrix. This iteration is compared in terms of numerical cost and global behavior with three other methods that display the same property of cubic convergence. Moreover, we consider heuristics that greatly improve the global behavior of the iterations. [less ▲]

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See detailBistability analyses of a caspase activation model for receptor-induced apoptosis
Eissing, Thomas; Conzelmann, Holger; Gilles, Ernst Dieter et al

in Journal of Biological Chemistry (2004), 279(35), 36892-36897

Apoptosis is an important physiological process crucially involved in development and homeostasis of multicellular organisms. Although the major signaling pathways have been unraveled, a detailed ... [more ▼]

Apoptosis is an important physiological process crucially involved in development and homeostasis of multicellular organisms. Although the major signaling pathways have been unraveled, a detailed mechanistic understanding of the complex underlying network remains elusive. We have translated here the current knowledge of the molecular mechanisms of the death-receptor-activated caspase cascade into a mathematical model. A reduction down to the apoptotic core machinery enables the application of analytical mathematical methods to evaluate the system behavior within a wide range of parameters. Using parameter values from the literature, the model reveals an unstable status of survival indicating the need for further control. Based on recent publications we tested one additional regulatory mechanism at the level of initiator caspase activation and demonstrated that the resulting system displays desired characteristics such as bistability. In addition, the results from our model studies allowed us to reconcile the fast kinetics of caspase 3 activation observed at the single cell level with the much slower kinetics found at the level of a cell population. [less ▲]

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See detailBootstrap and the parameters of pion nucleon resonances
Semenov-Tyan-Shanskiy, Kirill ULg; Vereshagin, Alexander; Vereshagin, Vladimir

in AIP Conference Proceedings (2004), 717

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See detailBootstrap Equations for String-Like Amplitude
Semenov-Tyan-Shanskiy, Kirill ULg

in Dubinin, M.; Savrin, V. (Eds.) High energy physics and quantum field theory. Proceedings, 18th International Workshop, QFTHEP 2004, St. Petersburg, Russia, June 17-23, 2004 (2004)

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See detailGlobal auroral conductance distribution due to electron and proton precipitation from IMAGE-FUV observations
Coumans, Valérie ULg; Gérard, Jean-Claude ULg; Hubert, Benoît ULg et al

in Annales Geophysicae [= ANGEO] (2004), 22(5), 1595-1611

The Far Ultraviolet (FUV) imaging system on board the IMAGE satellite provides a global view of the north auroral region in three spectral channels, including the SI 12 camera sensitive to Doppler shifted ... [more ▼]

The Far Ultraviolet (FUV) imaging system on board the IMAGE satellite provides a global view of the north auroral region in three spectral channels, including the SI 12 camera sensitive to Doppler shifted Lyman-alpha emission. FUV images are used to produce instantaneous maps of electron mean energy and energy fluxes for precipitated protons and electrons. We describe a method to calculate ionospheric Hall and Pedersen conductivities induced by auroral proton and electron ionization based on a model of interaction of auroral particles with the atmosphere. Different assumptions on the energy spectral distribution for electrons and protons are compared. Global maps of ionospheric conductances due to instantaneous observation of precipitating protons are calculated. The contribution of auroral protons in the total conductance induced by both types of auroral particles is also evaluated and the importance of proton precipitation is evaluated. This method is well adapted to analyze the time evolution of ionospheric conductances due to precipitating particles over the auroral region or in particular sectors. Results are illustrated with conductance maps of the north polar region obtained during four periods with different activity levels. It is found that the proton contribution to conductance is relatively higher during quiet periods than during substorms. The proton contribution is higher in the period before the onset and strongly decreases during the expansion phase of substorms. During a substorm which occurred on 28 April 2001, a region of strong proton precipitation is observed with SI 12 around 14:00MLT at similar to75degrees MLAT. Calculation of conductances in this sector shows that neglecting the protons contribution would produce a large error. We discuss possible effects of the proton precipitation on electron precipitation in aurora] arcs. The increase in the ionospheric conductivity, induced by a former proton precipitation can reduce the potential drop along field lines in the upward field-aligned currents by creating an opposite polarization electric field. This feedback mechanism possibly reduces the electron acceleration. [less ▲]

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See detailDe Kompia à Djolempoum : sur les sentiers tortueux de l’aménagement et de l'exploitation des forêts communautaires au Cameroun
Vermeulen, Cédric ULg; Vandenhaute, M.; Delvingt, W. et al

in VertigO : la Revue Electronique en Sciences de l'Environnement (2004), 7(1),

Started since one decade now, Community forestry in Cameroon presents half-hearted results. The goals of the 1994 law which aims to improve participation of locals populations to forest management and to ... [more ▼]

Started since one decade now, Community forestry in Cameroon presents half-hearted results. The goals of the 1994 law which aims to improve participation of locals populations to forest management and to increase their incomes seems to be hard to reach. Still this management process is criticised, mostly because of the complexity of the “simple management plan”. This article presents and analyses different experimental steps that were tested since ten years in Badjoué land in East Cameroon in order to make changes this precious tool to a participative and sustainable management of natural resources. [less ▲]

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See detailOlfactory responses to aphid and host plant volatile releases: (E)-beta-farnesene an effective kairomone for the predator Adalia bipunctata.
Francis, Frédéric ULg; Lognay, Georges ULg; Haubruge, Eric ULg

in Journal of Chemical Ecology (2004), 30(4), 741-55

The volatiles released from several aphid and host plant species, alone or associated, were studied for their infochemical role in prey location. Using a four-arm olfactometer, the attraction of several ... [more ▼]

The volatiles released from several aphid and host plant species, alone or associated, were studied for their infochemical role in prey location. Using a four-arm olfactometer, the attraction of several combinations of three aphid (Myzus persicae, Acyrthosiphon pisum, and Brevicoryne brassicae) and three plant (Vicia faba, Brassica napus, and Sinapis alba) species toward Adalia bipunctata larvae and adults was observed. Both predatory larvae and adults were attracted only by A. pisum and M. persicae when they were crushed, whatever the host plant. (E)-beta-farnesene, the aphid alarm pheromone, was the effective kairomone for the ladybird. Plant leaves alone (V. faba, B. napus, and S. alba) or in association with nonstressed whole aphids (the three species) did not have any attraction for the predator. The B. brassicae specialist aphid is the only prey that was not attracted to A. bipunctata larvae and adults, even if they were crushed. Release of B. brassicae molecules similar to the host plant allelochemicals was demonstrated by GC-MS analysis. The lack of behavioral response of the ladybird at short distance toward the cruciferous specialist aphid was related only to the absence of (E)-beta-farnesene in the aphid prey volatile pattern. [less ▲]

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See detailAge- and sex-stratified prevalence of physical disabilities and handicap in the general population.
Ethgen, Olivier ULg; Gillain, Daniel ULg; Gillet, Pierre ULg et al

in Aging Clinical & Experimental Research (2004), 16(5), 389-97

BACKGROUND AND AIMS: Our aim was to provide age- and sex-stratified prevalence estimates of physical disabilities and handicap in the general Belgian population. METHODS: A cross-sectional and ... [more ▼]

BACKGROUND AND AIMS: Our aim was to provide age- and sex-stratified prevalence estimates of physical disabilities and handicap in the general Belgian population. METHODS: A cross-sectional and demographically representative health interview survey was conducted nationwide in Belgium in 1997. The 8836 persons aged 15 years and over who answered the health interview were included in this study. Seventeen items from the survey encompassing main activities of daily living (ADL) and confining were analyzed. To provide prevalence estimates as detailed as possible, neither aggregation nor dichotomization were applied. RESULTS: Women consistently reported more disability than men: mobility (p < 0.001), transfer in-out bed (p < 0.001), transfer in-out chair (p < 0.001), dressing (p = 0.004), washing hands and face (p = 0.029), getting to and using toilet (p = 0.003), continence (p < 0.001), seeing (p < 0.001) and mastication (p < 0.001). As expected, there was a marked trend for increased prevalence of disability with increasing age for both sexes. Moderate disability arose mainly from the 25-34 age group for both sexes. For both genders, severe disability appeared mainly at higher ages, particularly for the 65-74 age group. Nevertheless, the data suggest that continence problems for women, mobility and transfer issues for men, as well as mastication problems for both genders, clearly emerge earlier than age 65. Regarding handicap, observed prevalence rates were increasing, in age as was the case for disability, but no differences were found between men or women, except for confinement to house/garden, for which women presented a higher rate in general (p < 0.001) and in the 75-84 age group (p = 0.036) in particular. CONCLUSIONS: This study shows the wide range of disability types in the general population and their association with handicap. While elderly individuals consistently report higher degrees of disability and handicap, attention should also be paid to younger age groups. Disability calls for wide, coherent and relevant medical as well as social responses. [less ▲]

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See detailÉvolution d’une forme : métrique et versification chez Jaccottet
Purnelle, Gérald ULg

in Halpern, Anne-Élisabeth (Ed.) Éventail pour Jaccottet (2004)

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See detailA dynamic neighbourhood discovery protocol for active overlay networks
Martin, Sylvain ULg; Leduc, Guy ULg

in Lecture Notes in Computer Science (2004), 2982

d-RADAR(1) is a neighbourhood discovery protocol for overlay network environments designed for (but not limited to) active network overlays. The core of the algorithm is an expanding ring-search based on ... [more ▼]

d-RADAR(1) is a neighbourhood discovery protocol for overlay network environments designed for (but not limited to) active network overlays. The core of the algorithm is an expanding ring-search based on the IP routing table content augmented with traffic-based and dynamic refreshing techniques that allows it to react to virtual topology changes (nodes joining/leaving the overlay) as well as IP topology changes (broken and repaired link, route changes and moving nodes). This paper presents how the protocol detects overlay candidate nodes using probing capsules and the algorithms needed to select neighbours among the candidates. We also show how d-RADAR keeps the neighbouring table up to date and learns topology changes while keeping a low discovery and refresh overhead. A short summary of simulations carried out with our active network simulator illustrates how these algorithms actually behave. [less ▲]

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See detailEl commercio justo como une arena y un proyecto de desarrollo. El caso de los cafeicultores en la region de Matagalpa.
Pleyers, Geoffrey; Pirotte, Gautier ULg

in Encuentro. Revista de la Universidad Centroamericana (Nicaragua) (2004), XXXVI(67), 132-149

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