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See detailBulletin agrométéorologique - Avril 2004
Tychon, Bernard ULg; Ozer, Pierre ULg; Horion, S. et al

in Bulletin Agrométéorologique (2004), 3(1), 1-4

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See detailDelayed and reduced coccolithophorid calcification under elevated PCO2
Delille, Bruno ULg; Harlay, Jérôme ULg; Zondervan, Ingrid et al

Poster (2004, May 10)

Numerous experiments to date have demonstrated that elevated PCO2 is detrimental to biogenic calcification rates. However, most of these experiments have been realized in batch or continuous cultures and ... [more ▼]

Numerous experiments to date have demonstrated that elevated PCO2 is detrimental to biogenic calcification rates. However, most of these experiments have been realized in batch or continuous cultures and give little information on the dynamics of calcification in natural conditions. The present work describes the development and decay of a nutrient-induced bloom of the coccolithophorid Emiliania huxleyi in a mesocosm experiment. The monitoring of Dissolved Inorganic Carbon (DIC) and Total Alkalinity (TAlk) within the seawater enclosures allowed us to describe comprehensively day to day dynamics of both calcification and organic carbon production. Three atmospheric PCO2 conditions (glacial, present and next century) were simulated by bubbling CO2 mixtures, while total alkalinity was left to evolve from its present value. No conspicuous change of Net Community Production under elevated PCO2 was recorded while the production of inorganic carbon appeared to be affected in two ways. Firstly, the production rate of inorganic carbon appeared to be lowered by 40% in the next century PCO2 conditions, decreasing concomitantly the calcification to photosynthesis ratio from 0.75 (glacial conditions) to 0.45 (next century conditions). Secondly, the onset of calcification was delayed by 24~48h under elevated PCO2 conditions, reducing the overall length of calcification in the course of the bloom. These two effects would act to reduce the amount of precipitated CaCO3 by coccolithophorids in a High CO2 world [less ▲]

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See detailBiogeochemical implications of calcification and secondary production of a population of the brittle star Acrocnida brachiata in a temperate coastal ecosystem
Harlay, Jérôme ULg; Gentil, Franck; Davoult, Dominique

Poster (2004, May 10)

The production of organic matter and calcium carbonate by a population of the brittle star Acrocnida brachiata (Echinodermata) was calculated using demographic structure, population density, and relations ... [more ▼]

The production of organic matter and calcium carbonate by a population of the brittle star Acrocnida brachiata (Echinodermata) was calculated using demographic structure, population density, and relations between the size and the ash-free dry weight (AFDW) or the calcimass. During a two-year survey in the Bay of Seine (English Channel, France), one of the four major estuaries affecting the biogeochemical cycling of elements in the southern bight of the North Sea, benthic production of this species amounted to 40.3 g.m-2.yr-1 for AFDW and 80.0 g.m-2.yr-1 for CaCO3. Respiration, based on secondary production, was estimated to be 736 mmol CO2.m-2.yr-1. Using the molar ratio () of CO2 released to CaCO3 precipitated, this biogenic precipitation of calcium carbonate would result in an additional release of 617 mmol CO2.m-2.yr-1. The results of the present study demonstrate that marine calcification should be considered as a significant source of CO2 to seawater and thus a potential source of CO2 to the atmosphere, emphasizing the important role of the biomineralization and dissolution in the carbon budget of temperate coastal ecosystems. This additional biogenic source of CO2 could increase in the future in two ways: firstly, as a positive feedback of  to the rising pCO2 and, secondly, as a positive response to the availability of nutrients due to eutrophication. [less ▲]

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See detailL'enseignement par problème (EPP) et l'apprentissage par problème (APP)
VIERSET, Viviane ULg; Groupe Gypse

Conference (2004, May 06)

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See detailUse of remote sensing imagery for geotraceability in agriculture
Buffet, Dominique; Oger, Robert ULg; Tychon, Bernard ULg

Conference (2004, May 06)

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See detailCirculating angiogenic factors and preeclampsia
Tsatsaris, V.; Goffin, Frédéric ULg; Foidart, Jean-Michel ULg

in New England Journal of Medicine [=NEJM] (2004), 350(19), 2003-2004

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See detailThe hard pomeron in soft data
Cudell, Jean-René ULg; Martynov, Evgenij; Selyugin, Oleg Viktorovich et al

in Physics Letters B (2004), 587(1-2), 78-86

We show that the data for the total cross section and for the real part of the elastic amplitude indicate the presence of a hard pomeron in pip and Kp elastic scattering at t = 0, compatible with that ... [more ▼]

We show that the data for the total cross section and for the real part of the elastic amplitude indicate the presence of a hard pomeron in pip and Kp elastic scattering at t = 0, compatible with that observed in deep inelastic scattering. We show that such a hard pomeron is also compatible with pp and pp data, provided one unitarises it at high energy. (C) 2004 Published by Elsevier B.V. [less ▲]

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See detailPrésentation du groupe GYPSE et de ses fonctions pédagogiques au sein de l'université UCAM
VIERSET, Viviane ULg; Groupe Gypse

Conference (2004, May 05)

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See detailPropriétés de surface et techno-fonctions
Blecker, Christophe ULg

Scientific conference (2004, May 05)

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See detailg-mode pulsations in slowly pulsating B stars
De Cat, P.; Daszynska-Daszkiewicz, J.; Briquet, Maryline ULg et al

in IAU Colloq. 193: Variable Stars in the Local Group (2004, May 01)

In this paper, we give an updated overview of the observed characteristics of g-mode pulsations in slowly pulsating B stars. These characteristics are based on the combined results of linear nonadiabatic ... [more ▼]

In this paper, we give an updated overview of the observed characteristics of g-mode pulsations in slowly pulsating B stars. These characteristics are based on the combined results of linear nonadiabatic analysis of the oscillations and a photometric and spectroscopic mode identification for a sample of 13 members. For 4 stars, at least one mode is stable in all the considered theoretical models. [less ▲]

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See detailMode identification using photometry and spectroscopy
De Ridder, Joris; Aerts, Conny; Dupret, Marc-Antoine ULg

in IAU Colloq. 193: Variable Stars in the Local Group (2004, May 01)

We tested a stepwise approach to combine photometry and spectroscopy for mode identificaiton where we first used the photometric amplitude ratios to restrict the degree l, then did a spectroscopic mode ... [more ▼]

We tested a stepwise approach to combine photometry and spectroscopy for mode identificaiton where we first used the photometric amplitude ratios to restrict the degree l, then did a spectroscopic mode identification, and finally fitted the photometric amplitudes to restrict the list of candidate modes. For the spectroscopic mode identification, we implemented an efficient multi-mode moment method variant. We conclude that this new variant works well, but that the photometric amplitudes are too model sensitive to do any additional mode discrimination. [less ▲]

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See detailNonadiabatic observables in main sequence delta Scuti stars
Moya, A.; Garrido, R.; Dupret, Marc-Antoine ULg

in IAU Colloq. 193: Variable Stars in the Local Group (2004, May 01)

Using a theoretical nonadiabatic pulsation model, phase differences and amplitude ratios between the relative effective temperature variation and the relative radial displacement have been calculated ... [more ▼]

Using a theoretical nonadiabatic pulsation model, phase differences and amplitude ratios between the relative effective temperature variation and the relative radial displacement have been calculated. These quantities, when compared with photometric observations in different colors, provide an efficient instrument for mode identification, the first step to understand the internal structure of the stars. The theoretical results presented in this paper show a dependence for delta Scuti stars on the mixing length parameter alpha used to treat the convection using the standard Mixing Length Theory. The nonadiabatic pulsational code developed here includes the pulsation atmosphere interaction as described by Dupret et al. (2002). The equilibrium models are provided by the CESAM evolutionary code, where a complete reconstruction of non-grey atmospheres (Kurucz models) is included. [less ▲]

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See detailNon-adiabatic asteroseismology of near-main sequence variable stars
Dupret, Marc-Antoine ULg

in IAU Colloq. 193: Variable Stars in the Local Group (2004, May 01)

We present in this talk a new linear non-adiabatic pulsation code: MAD[SUP]1[/SUP]. We detail all the possible applications of it in the frame of asteroseismology. By using it, photospheric observables ... [more ▼]

We present in this talk a new linear non-adiabatic pulsation code: MAD[SUP]1[/SUP]. We detail all the possible applications of it in the frame of asteroseismology. By using it, photospheric observables such as multi-color photometric amplitude ratios, phase differences and line profile variations can be determined accurately and confronted with observations. Moreover, MAD enables the precisely analysis of the excitation mechanisms of pulsating stars. Applications to different kinds of variable stars (delta Sct, beta Cephei, Slowly Pulsating B and gamma Dor stars) are presented by Dupret et al. (these proceedings), Handler and Aerts (these proceedings), De Cat et al. (these proceedings) and De Ridder et al. (these proceedings). [less ▲]

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See detailL'astronomie dans le monde
Manfroid, Jean ULg

Article for general public (2004)

comètes en pagaille; Recherche d'astéroïdes; Voisinage galactique; Titan en X; Titan à haute résolution; Alignement parfait dans le Sagittaire; Où est la lune de Sedna; SgrA*; Première image d'une ... [more ▼]

comètes en pagaille; Recherche d'astéroïdes; Voisinage galactique; Titan en X; Titan à haute résolution; Alignement parfait dans le Sagittaire; Où est la lune de Sedna; SgrA*; Première image d'une planète extrasolaire?; Deux Jupiter chauds; Cycles stellaires; Le trou noir de M87; Un nouveau bras pour la Voie LactÃée; L'étoile la plus massive jamais observée! [less ▲]

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See detailEfficacy and safety of adalimumab as monotherapy in patients with rheumatoid arthritis for whom previous disease modifying antirheumatic drug treatment has failed
van de Putte, B. A.; Atkins, C.; Malaise, Michel ULg et al

in Annals of the Rheumatic Diseases (2004), 63(5), 508-516

Objective: To evaluate the efficacy and safety of monotherapy with adalimumab in patients with RA for whom previous DMARD treatment has failed. Methods: In a 26 week, double blind, placebo controlled ... [more ▼]

Objective: To evaluate the efficacy and safety of monotherapy with adalimumab in patients with RA for whom previous DMARD treatment has failed. Methods: In a 26 week, double blind, placebo controlled, phase III trial, 544 patients with RA were randomised to monotherapy with adalimumab 20 mg every other week, 20 mg weekly, 40 mg every other week, 40 mg weekly, or placebo. The primary efficacy end point was greater than or equal to 20% improvement in the ACR core criteria (ACR20 response). Secondary efficacy end points included ACR50, ACR70, EULAR responses, and the Disability Index of the Health Assessment Questionnaire (HAQ DI). Results: After 26 weeks, patients treated with adalimumab 20 mg every other week, 20 mg weekly, 40 mg every other week, and 40 mg weekly had significantly better response rates than those treated with placebo: ACR20 (35.8%, 39.3%, 46.0%, 53.4%, respectively v 19.1%; pless than or equal to 0.01); ACR50 (18.9%, 20.5%, 22.1%, 35.0% v 8.2%; pless than or equal to 0.05); ACR70 (8.5%, 9.8%, 12.4%, 18.4% v 1.8%; pless than or equal to 0.05). Moderate EULAR response rates were significantly greater with adalimumab than with placebo (41.5%, 48.2%, 55.8%, 63.1% v 26.4%; pless than or equal to 0.05). Patients treated with adalimumab achieved better improvements in mean HAQ DI than those receiving placebo (-0.29, -0.39, -0.38, -0.49 v -0.07; pless than or equal to 0.01). No significant differences were found between adalimumab and placebo treated patients for serious adverse events, serious infections, or malignancies. Injection site reaction occurred in 10.6% and 0.9% of adalimumab and placebo treated patients, respectively (pless than or equal to 0.05). Conclusion: Among patients with RA for whom previous DMARD treatment had failed, adalimumab monotherapy achieved significant, rapid, and sustained improvements in disease activity and improved physical function and was safe and well tolerated. [less ▲]

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See detailNon-adiabatic seismic study of the thin convective envelope of delta Scuti stars
Dupret, Marc-Antoine ULg; Grigahcène, A.; Garrido, R. et al

in IAU Colloq. 193: Variable Stars in the Local Group (2004, May 01)

For delta Sct stars, the theoretical predictions of a non-adiabatic pulsation code are very dependent on the characteristics of the thin convective envelope of the models (Balona and Evers 1999). The ... [more ▼]

For delta Sct stars, the theoretical predictions of a non-adiabatic pulsation code are very dependent on the characteristics of the thin convective envelope of the models (Balona and Evers 1999). The treatment of the non-adiabatic interaction between convection and pulsation also has a significant impact on the results, particularly near the red edge of the instability strip. The non-adiabatic theoretical predictions can be tested upon observations by comparing them to the amplitude ratios and phase differences as observed in different color passbands (Dupret et al. 2003). In the first part of this paper, we compare the results obtained by adopting different treatments of convection in the interior and atmosphere models: mixing-length theory (MLT) and full spectrum of turbulence (FST) (Canuto et al. 1996, CGM). In the second part, we examine the problem of the interaction between convection and pulsation and compare the mode stability obtained with and without including time-dependent convection in our non-adiabatic code. [less ▲]

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See detailAnalysis of the spatial expression pattern of seven kip related proteins (KRPs) in the shoot apex of Arabidopsis thaliana
Ormenese, Sandra ULg; de Almeida Engler, J.; De Groodt, R. et al

in Annals of Botany (2004), 93(5), 575-580

Background and aims Kip-related-proteins (KRPs), negative regulators of cell division, have recently been discovered in plants but their in planta function is as yet unclear. In this study the spatial ... [more ▼]

Background and aims Kip-related-proteins (KRPs), negative regulators of cell division, have recently been discovered in plants but their in planta function is as yet unclear. In this study the spatial expression of all seven KRP genes in shoot apices of Arabidopsis thaliana were compared. Methods In situ hybridization analyses were performed on longitudinal sections of shoot apices from 2-month-old Arabidopsis plants. Key Results The study provides evidence for different expression pattern groups. KRP1 and KRP2 expression is restricted to the endoreduplicating tissues. In contrast, KRP4 and KRP5 expression is mainly restricted to mitotically dividing cells. KRP3, KRP6 and KRP7 can be found in both mitotically dividing and endoreduplicating cells. Conclusion The results suggest differential roles for the distinct KRPs. KRP1 and KRP2 might specifically be involved in the establishment of polyploidy. In contrast, KRP4 and KRP5 might be involved in regulating the progression through the mitotic cell cycle. KRP3, KRP6 and KRP7 might have a function in both types of cell cycle. (C) 2004 Annals of Botany Company. [less ▲]

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See detailWhat Can We Expect Of MUNE in ALS ?
WANG, François-Charles ULg

Scientific conference (2004, May)

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See detailHippopotamus of the W-Arli-Pendjari-Oti-Mandouri-Keran Ecosystem. West Africa. Status, distribution and conservation issues
Bouché, Philippe ULg

in Suiform soundings PPHSG Newsletter (2004), 4(1), 14-19

For the first time in April 2003, an aerial total wildlife count of the entire W-Arli-Pendjari-Oti- Mandouri-Keran (WAPOK) Ecosystem, the largest savannah ecosystem of West Africa, has been conducted ... [more ▼]

For the first time in April 2003, an aerial total wildlife count of the entire W-Arli-Pendjari-Oti- Mandouri-Keran (WAPOK) Ecosystem, the largest savannah ecosystem of West Africa, has been conducted. During this survey, Hippopotamus have been observed 51 times, totaling 696 individuals. An average of 13.86 ± 16.73 individuals was noted. The group size varied between 1 and 65 individuals. In the WAPOK ecosystem, the future of hippopotamus is ensured by the tourism activity in the area and the redistribution of tourism revenue to human communities living around the ecosystem, thanks to several conservation project, but more certainly, to the conservation initiative of several private stakeholders. [less ▲]

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See detailLa syncope
Mathieu, F.; Melon, Pierre ULg; Waleffe, André ULg et al

in Revue Médicale de Liège (2004), 59(5), 311-4

Syncope remains a clinical challenge. Accurate history taking, physical examination and EKG are mainstays of the diagnosis work up. The most important parameter for prognosis and requiring aggressive ... [more ▼]

Syncope remains a clinical challenge. Accurate history taking, physical examination and EKG are mainstays of the diagnosis work up. The most important parameter for prognosis and requiring aggressive management is a structural heart disease. Patient without cardiopathy presenting multiple episodes may be candidate for tilt testing and loop EKG recorder. [less ▲]

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