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See detailGlacial-interglacial changes of continental weathering: estimates of the related CO2 and HCO3- flux variations and their uncertainties
Munhoven, Guy ULg

in Global and Planetary Change (2002), 33(1-2), 155-176

A range of estimates for the glacial-interglacial variations in CO, consumption and HCO3- production rates by continental weathering processes were calculated with two models of continental weathering ... [more ▼]

A range of estimates for the glacial-interglacial variations in CO, consumption and HCO3- production rates by continental weathering processes were calculated with two models of continental weathering: the Gibbs and Kump Weathering Model (GKWM) [Paleoceanography 9(4) (1994) 529] and an adapted version of Amiotte Suchet and Probst's Global Erosion Model for CO2 Consumption (GEM-CO2) [C. R, Acad. Sci. Paris, Ser. 11317 (1993) 615; Tellus 47B (1995) 273]. Both models link CO2 consumption and HCO3- production rates to the global distributions of lithology and runoff. A spectrum of 16 estimates for the runoff distribution at the Last Glacial Maximum (LGM) was constructed on the basis of two different data sets for present-day runoff and climate results from eight GCM climate simulation experiments carried out in the framework of the Paleo Modelling Intercomparison Project (PMIP). With these forcings, GKWM produced 3.55-9.0 Tmol/year higher and GEM-CO2 4.7-13.25 Tmol/year higher global HCO3- (1 Tmol=10(12) mol) production rates at the LGM, Mean variations (plus/minus one standard error of the mean with 7 df) were 6.2+/-0.6 and 9.4+/-1.0 Tmol/year, respectively. The global CO2 consumption rates obtained with GKWM were 1.05-4.5 Tmol/year (mean: 2.8+/-0.4 Tmol/year) higher at the LGM than at present. With GEM-CO2 this increase was 1.95-7.15 Tmol/year (mean: 4.8+/-0.6 Tmol/year). The large variability in the changes obtained with each weathering model was primarily due to the variability in the GCM results. The increase in the CO2 consumption rate due to continental shelf exposure at the LGM was always more than 60% larger than its reduction due to ice cover. For HCOT production rates, the increase related to shelf exposure was always more than twice as large as the decrease due to ice cover. Flux variations in the areas exposed both now and at the LGM were, in absolute value, always more than 3.5 times lower than those in the shelf environment. The calculated CO2 consumption rates by carbonate weathering were consistently higher at the LGM, by 2.45-4.5 Tmol/year (mean: 3.4+/-0.2 Tmol/year) according to GKWM and by 2.75-6.25 Tmol/year (mean: 4.6+/-0.4 Tmol/year) according to GEM-CO, For silicate weathering, GKWM produced variations ranging between a 1.9 Tmol/year decrease and a 0.4 Tmol/year increase for the LGM (mean variation: -0.7+/-0.2 Tmol/year); GEM-CO, produced variations ranging between a 0.8 Tmol/year decrease and a 1.05 Tmol/year increase (mean variation: +0.2+/-0.2 Tmol/year). In the mean, the calculated variations of CO2 and HCO3- fluxes would contribute to reduce atmospheric p(CO2) by 5.7+/-1.3 ppmv (GKWM) or 3 12.1+/-1.7 ppmv (GEM-CO2), which might thus represent a non-negligible part of the observed glacial interglacial variation of similar to 75 ppmv. (C) 2002 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailEinsatz der quantitativen Ultrasonometrie in der Knochendiagnostik beim Pferd
Carstanjen, B; Lepage, OM; Detilleux, Johann ULg et al

Poster (2002)

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See detailExercise stress echocardiography in healthy horses
Amory, Hélène ULg; Brihoum, M; Debrue, M et al

in Proceedings of the 41st Annual Congress of the British Equine Veterinary Association (BEVA) (2002)

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See detailMesure de la charge psychosociale et du stress professionnel auprès du personnel du groupe FN Herstal
Italiano, Patrick ULg; Peters, Stéphanie ULg

Report (2002)

Le rapport analyse les résultats d'une enquête sur la charge psychosociale au sein de l'entreprise et détaille les situations-problème qui y sont liées.

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See detailOsteoporosis in the very elderly
Halkin, V; Bruyère, Olivier ULg; Reginster, Jean-Yves ULg

in Medicographia (2002), 24(4), 316-321

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See detailMyoglobinurie atypique: nouveaux cas en Belgique et en France
Delguste, Catherine ULg; Amory, Hélène ULg

in Proceedings of the 19th annual meeting of the Belgian Equine Practitioners Society (BEPS) (2002)

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See detailUsing word frequencies for testing equivalence between two DNA sequences
Jansen, I.; Van Steen, Kristel ULg; Molenberghs, G. et al

in Genetic Epidemiology (2002), 23

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See detailStudy of the early abortion in reciprocal crosses between Phaseolus vulgaris L. and Phaseolus polyanthus Greenm
Geerts, P.; Toussaint, André ULg; Mergeai, Guy ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2002), 6(2), 109-119

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See detailGPS, superconducting and absolute gravimeter measurements to evaluate crustal deformation in Membach, Belgium
Van Camp, Michel; Warnant, René ULg; Francis, Olivier et al

Conference (2002)

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See detailDu Fantastique réel au réalisme magique
Denis, Benoît ULg

in Textyles : Revue des Lettres Belges de Langue Française (2002), (21),

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See detail- La bande dessinée muette et le texte
Paques, Frédéric ULg

in Art&Fact (2002), 21

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See detailPerspectives de dialogue entre des neuromédiateurs et les kératinocytes.
Pierard-Franchimont, Claudine ULg; Faska, N.; Nikkels, Arjen ULg et al

in Dermatologie Actualité (2002), 65

Les neuromédiateurs contrôlant l’activité de l’axe hypothalamo-hypophysaire sont aussi exprimés dans la peau. D’autres neuromédiateurs liés au stress le sont également. En fait, près d’une vingtaine de ... [more ▼]

Les neuromédiateurs contrôlant l’activité de l’axe hypothalamo-hypophysaire sont aussi exprimés dans la peau. D’autres neuromédiateurs liés au stress le sont également. En fait, près d’une vingtaine de ces molécules sont synthétisées in situ et sont connues pour avoir des récepteurs spécifiques et exprimer une activité biologique dans cet organe. Certaines exercent un impact fonctionnel sur les kératinocytes. Il s’agit en fait de systèmes paracrines neuro-kératinocytaires et autocrines par lesquels les kératinocytes expriment de nombreux récepteurs pour les neuromédiateurs qu’ils libèrent eux-mêmes. [less ▲]

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See detailDetermination of organochlorine pesticide residues in the blood of healthy individuals
Charlier, Corinne ULg; Plomteux, Guy ULg

in Clinical Chemistry & Laboratory Medicine (2002), 40(4), 361-364

Pesticide use is one of several factors that have permitted maintenance of our supply of food in spite of continuing increase of the population. However, the use of biologically active compounds poses ... [more ▼]

Pesticide use is one of several factors that have permitted maintenance of our supply of food in spite of continuing increase of the population. However, the use of biologically active compounds poses potential problems of toxicity. If the compound is used at any stage of food production, residues or derivatives may persist in food and the entire population may be exposed to the trace amounts of the material. The human body burden associated with long-term exposure may or may not be associated with illness. Persistent environmental contaminants such as pesticide residues have long been suspected to be implicated in cancer etiology. Organochlorine chemicals are persistent, lipophilic compounds commonly present in the environment. Some of them demonstrated carcinogenic activity in laboratory animals. Controversy still exists concerning their carcinogenic potential in humans. To answer this question, clinical toxicology laboratories should propose validated methodologies able to identify and quantify pesticide residues in biological samples. An example of chromatographic method dedicated to organochlorine residues is presented here and illustrated by results obtained in a healthy population (104 men, 147 women). Only 17.9% of the samples were free from detectable amounts of pesticides and p,p’-DDE 1,1-dichloro-2,2-bis(p-chlorophenyl) ethylene was the most frequently detected residue (66.5%). Hexachlorobenzene was found at detectable level in 13.5% of the samples. [less ▲]

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See detailDeterministic and stochastic modelling for protection zone delineation
Rentier, Céline; Dassargues, Alain ULg

in Calibration and Reliability in Groundwater Modelling: A Few Steps Closer to Reality (2002)

Protection zones delimited by isochrones are often computed using calibrated groundwater flow and transport models. In heterogeneous formations, all direct (hard) and indirect (soft) data must be used ... [more ▼]

Protection zones delimited by isochrones are often computed using calibrated groundwater flow and transport models. In heterogeneous formations, all direct (hard) and indirect (soft) data must be used optimally. Approaches involving in situ pumping and tracer tests, combined with geophysical and/or other geological observations, should be developed. In a deterministic framework, the calibrated model is considered to be the best representation of reality at the current investigation stage, but uncertainty of the results is not quantified. Using stochastic methods, a range of equally likely isochrones can be produced, allowing us to quantify the influence of our knowledge on the aquifer parameters on protection-zone uncertainty. Furthermore, integration of soft data in a conditioned stochastic generation process, possibly associated with an inverse modelling procedure, can reduce the resulting uncertainty. Proposed is a stochastic methodology for protection-zone delineation, integrating hydraulic conductivity measurements (hard data), head observations and electrical resistivity data (soft data). [less ▲]

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See detailAccords collectifs et individuels de travail en droit du travail
Kefer, Fabienne ULg; Clesse, Jacques ULg; Vielle, Pascale

in Rapports belges au congrès de l'académie internationale de Droit comparé à Brisbane (2002)

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