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See detailLa censure a-t-elle disparu ?
Durand, Pascal ULg

Article for general public (2007)

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See detailDiscovery of Magnetic Fields in Slowly Pulsating B Stars
Hubrig, S.; Briquet, Maryline ULg; Schöller, M. et al

in Active OB-Stars: Laboratories for Stellar and Circumstellar Physics, ASP Conference Series, Vol. 361, Proceedings of the conference held 29 August - 2 September, 2005 at Hokkai-Gakuen University, Sapporo, Japan. (2007, March 01)

We present the first observations and conclusions of a magnetic survey with FORS 1 at the VLT of a sample of 25 Slowly Pulsating B stars. A clear mean longitudinal magnetic field of the order of a few ... [more ▼]

We present the first observations and conclusions of a magnetic survey with FORS 1 at the VLT of a sample of 25 Slowly Pulsating B stars. A clear mean longitudinal magnetic field of the order of a few hundred Gauss was detected in eleven SPBs. Among them several SPBs show a magnetic field that varies in time. It becomes clear that SPBs cannot be regarded anymore as non-magnetic stars. [less ▲]

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See detailCOSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses. V. The time delay in SDSS J1650+4251
Vuissoz, C.; Courbin, F.; Sluse, Dominique ULg et al

in Astronomy and Astrophysics (2007), 464

Aims.Our aim is to measure the time delay between the two gravitationally lensed images of the z_qso = 1.547 quasar SDSS J1650+4251, in order to estimate the Hubble constant H_0. Methods: Our measurement ... [more ▼]

Aims.Our aim is to measure the time delay between the two gravitationally lensed images of the z_qso = 1.547 quasar SDSS J1650+4251, in order to estimate the Hubble constant H_0. Methods: Our measurement is based on R-band light curves with 57 epochs obtained at Maidanak Observatory, in Uzbekistan, from May 2004 to September 2005. The photometry is performed using simultaneous deconvolution of the data, which provides the individual light curves of the otherwise blended quasar images. The time delay is determined from the light curves using two very different numerical techniques, i.e., polynomial fitting and direct cross-correlation. The time delay is converted into H[SUB]0[/SUB] following analytical modeling of the potential well. Results: Our best estimate of the time delay is Delta t = 49.5 ± 1.9 days, i.e., we reach a 3.8% accuracy. The R-band flux ratio between the quasar images, corrected for the time delay and for slow microlensing, is F_A/F[SUB]B[/SUB] = 6.2 ± 5%. Conclusions: .The accuracy reached on the time delay allows us to discriminate well between families of lens models. As for most other multiply imaged quasars, only models of the lensing galaxy that have a de Vaucouleurs mass profile plus external shear give a Hubble constant compatible with the current most popular value (H[SUB]0[/SUB] = 72 ± 8 km s[SUP]-1[/SUP] Mpc[SUP]-1[/SUP]). A more realistic singular isothermal sphere model plus external shear gives H[SUB]0[/SUB] = 51.7[SUP]+4.0[/SUP][SUB]-3.0[/SUB] km s[SUP]-1[/SUP] Mpc[SUP]-1[/SUP]. Table [see full text] is only available in electronic form at http://www.aanda.org [less ▲]

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See detailCHOP alone compared with CHOP plus radiotherapy for localized aggressive lymphoma in elderly patients: A study by the Groupe d'Etude des Lymphomes de I'Adulte
Bonnet, Christophe ULg; Fillet, Georges ULg; Mounier, N. et al

in Journal of Clinical Oncology (2007), 25(7), 787-792

Purpose Chemoradiotherapy has been considered standard treatment for patients with limited-stage aggressive lymphoma on the basis of trials conducted before the introduction of the International ... [more ▼]

Purpose Chemoradiotherapy has been considered standard treatment for patients with limited-stage aggressive lymphoma on the basis of trials conducted before the introduction of the International Prognostic Index. To evaluate this approach in elderly patients with low-risk localized lymphoma, we conducted a trial comparing chemoradiotherapy with chemotherapy alone. Patients and Methods Previously untreated patients older than 60 years with localized stage I or II histologically aggressive lymphoma and no adverse prognostic factors of the International Prognostic Index were randomly assigned to receive either four cycles of cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP) plus involved-field radiotherapy (299 patients) or chemotherapy alone with four cycles of CHOP (277 patients). Results With a median follow-up time of 7 years, event-free and overall survival did not differ between the two treatment groups (P =.6 and P =.5, respectively). The 5-year estimates of event-free survival were 61% for patients receiving chemotherapy alone and 64% for patients receiving CHOP plus radiotherapy; the 5-year estimates of overall survival were 72% and 68%, respectively. In a multivariate analysis, overall survival was affected by stage II disease (P <.001) and male sex (P =.03). Conclusion In this large prospective study, CHOP plus radiotherapy did not provide any advantage over CHOP alone for the treatment of low-risk localized aggressive lymphoma in elderly patients. [less ▲]

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See detail31 janvier : journée sur le projet de service
Grignard, Sophie; Vandoorne, Chantal ULg

in Promouvoir la Santé à l'Ecole (2007), (17), 2-4

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See detailLe syndrome de Hutchinson-Gilford (progeria): analyse clinique et moleculaire chez une patiente d'origine africaine
Mutesa, Léon; Pierquin, Geneviève ULg; Cwiny-Ay, N. et al

in Revue Médicale de Liège (2007), 62(3), 155-8

Hutchinson-Gilford progeria syndrome (HGPS) is an extremely rare genetic disease characterized by an early onset of several clinical features including premature ageing in children. Approximately 80% of ... [more ▼]

Hutchinson-Gilford progeria syndrome (HGPS) is an extremely rare genetic disease characterized by an early onset of several clinical features including premature ageing in children. Approximately 80% of HGPS cases are caused by a de novo single-base pair substitution c.1824 C>T (GGC > GGT, p.Gly608Gly) within the exon 11 of the LMNA gene which codes for lamins A and C proteins. This mutation creates an abnormal splice donor site, leading to the formation of a truncated lamin A protein. Only a very few cases of African patients with HGPS have been reported, but none of them has been characterized at the molecular level. We report here a 12 year-old-girl African patient with HGPS, in whom the p.Gly608Gly heterozygous disease-causing mutation was found. [less ▲]

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See detailLe medicament du mois. Olmesartan medoxomil hydrochlorothiazide (Olmetec Plus ou Belsar Plus)
Lancellotti, Patrizio ULg

in Revue Médicale de Liège (2007), 62(3), 175-9

The therapeutic control of hypertension is still a global challenge and frequently requires combination therapy. Olmesartan medoxomil hydrochlorothiazide (Olmetec plus, Belsar plus) is a fixed-dose ... [more ▼]

The therapeutic control of hypertension is still a global challenge and frequently requires combination therapy. Olmesartan medoxomil hydrochlorothiazide (Olmetec plus, Belsar plus) is a fixed-dose combination of olmesartan 20 mg and hydrochlorothiazide 12.5 or 25 mg. Olmesartan is a well known angiotensin II AT1 receptor blocker characterized by a good efficacy, a fast and prolonged duration of action and a placebo-like tolerability. With the combination therapy, no significant change of pharmacokinetics of either component is observed. The fixed-dose combination results in a greater blood pressure reduction compared to monotherapy with either component. This is at least effective as or even more effective than the combination of atenolol or losartan with hydrochlorothiazide, respectively. The responder rate is about 90%. The safety and tolerability remain excellent. Beyond the antihypertensive effect, olmesartan significantly reduces vascular inflammation and the wall-to-lumen ration in arteries. The starting dose is 20/12.5 mg. [less ▲]

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See detailProjecting Generation Decisions Induced by a Stochastic Program on a Family of Supply Curve Functions
Defourny, Boris ULg; Wehenkel, Louis ULg

Scientific conference (2007, March)

We propose to post-process the results of a scenario based stochastic program by projecting its decisions on a parameterized space of policies. By doing so the risk of overfitting to the set of scenarios ... [more ▼]

We propose to post-process the results of a scenario based stochastic program by projecting its decisions on a parameterized space of policies. By doing so the risk of overfitting to the set of scenarios used in the stochastic program is reduced. A proper choice of the structure of the space of policies allows one to exploit them in the context of novel scenarios, be it for Monte-Carlo based value estimation or for use in real-life conditions. These ideas are presented in the context of planning the exploitation of electric energy resources or for evaluating the economic value of a portfolio of assets. [less ▲]

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See detailThe role of deformation in the bouncing droplet problem
Terwagne, Denis ULg; Gilet, Tristan ULg; Dorbolo, Stéphane ULg et al

Poster (2007, March)

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See detailStrategies visant a diminuer le delai entre l'admission aux urgences et l'angioplastie coronaire: a propos d'un article recent du New England Journal of Medicine
Limet, Raymond ULg; Legrand, Victor

in Revue Médicale de Liège (2007), 62(3), 147-50

A recent publication in New England Journal of Medicine stresses the fact that the mere presence of a coronarography equipment to dilate acute myocardial infarction is not sufficient to obtain the opening ... [more ▼]

A recent publication in New England Journal of Medicine stresses the fact that the mere presence of a coronarography equipment to dilate acute myocardial infarction is not sufficient to obtain the opening of the related myocardial infarction artery in due time. [less ▲]

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See detailSeasonal height change influence in GPS and gravimetric campaign data
Demoulin, Alain ULg; Ducarme, B.; Everaerts, Michel ULg

in Journal of Geodynamics (2007), 43(2), 308-319

Low motion rates, typical of intraplate settings, make it particularly difficult to isolate a tectonic signal in vertical displacements of the ground dominated by near-surface influences. Since the spring ... [more ▼]

Low motion rates, typical of intraplate settings, make it particularly difficult to isolate a tectonic signal in vertical displacements of the ground dominated by near-surface influences. Since the spring 2003, we have performed half-yearly GPS and gravimetric campaigns in NE Ardenne in order to evaluate the seasonal changes imposed to the ground height by groundwater variations. The GPS height data show an excellent negative correlation with a proxy for groundwater variations, based on rainfall in the 6 months before the survey, that allows a reliable correction of the measured height changes. During the 2003-2005 time span, the seasonal groundwater-dependent height changes have amounted to a maximum 7.5 mm. The gravimetric campaigns were able to detect reliably only gravity changes larger than 10 mu gal, which corresponds to the upper limit of the gravity changes associated with the proposed groundwater-GPS model. No conclusive result may therefore be derived from the gravity observations. (c) 2006 Elsevier Ltd. All rights reserved. [less ▲]

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See detailSennéfer et Amenemopé, une affaire de famille
Laboury, Dimitri ULg

in Egypte Afrique & Orient (2007), 45

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See detailLe coût du libre accès dans le cas du modèle hybride
Collette, Caroline ULg

in Cahiers de la Documentation = Bladen voor Documentatie (2007), 1

L'article présente un nouveau schéma de publication par lequel les éditeurs de revues "traditionnelles" proposent aux auteurs de payer des frais afin que leur article soit directement en accès libre. Dans ... [more ▼]

L'article présente un nouveau schéma de publication par lequel les éditeurs de revues "traditionnelles" proposent aux auteurs de payer des frais afin que leur article soit directement en accès libre. Dans cet article est comparé le coût d'accès à l'information suivant ce modèle par rapport à celui de l'accès par abonnement institutionnel. Les informations utilisées pour réaliser cette estimation sont basées sur des données provenant de l'Université de Liège. [less ▲]

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See detailNon-thermal radio emission from O-type stars. II. HD167971
Blomme, Ronny; De Becker, Michaël ULg; Runacres, M. C. et al

in Astronomy and Astrophysics (2007), 464(2), 701-148

HD 167971 is a triple system consisting of a 3.3-day eclipsing binary (O5- 8 V + O5- 8 V) and an O8 supergiant. It is also a well known non-thermal radio emitter. We observed the radio emission of HD ... [more ▼]

HD 167971 is a triple system consisting of a 3.3-day eclipsing binary (O5- 8 V + O5- 8 V) and an O8 supergiant. It is also a well known non-thermal radio emitter. We observed the radio emission of HD 167971 with the Very Large Array (VLA) and the Australia Telescope Compact Array (ATCA). By combining these data with VLA archive observations we constructed a radio lightcurve covering a 20-yr time-range. We searched for, but failed to find, the 3.3-day spectroscopic period of the binary in the radio data. This could be due to the absence of intrinsic synchrotron radiation in the colliding-wind region between the two components of the eclipsing binary, or due to the large amount of free-free absorption that blocks the synchrotron radiation. We are able to explain many of the observed characteristics of the radio data if the non-thermal emission is produced in a colliding-wind region between the supergiant and the combined winds of the binary. Furthermore, if the system is gravitationally bound, the orbital motion occurs over a period of similar to 20 years or longer, as suggested by the long-term variability in the radio data. We argue that the variability is due to the free-free absorption that changes with orbital phase or may also in part be due to changes in separation, should the orbit be eccentric. [less ▲]

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See detailBifractality of human DNA strand-asymmetry profiles results from transcription
Nicolay, Samuel ULg; Brodie, E. B.; Touchon, M. et al

in Physical Review E (2007), 75(3), 032902

We use the wavelet transform modulus maxima method to investigate the multifractal properties of strand-asymmetry DNA walk profiles in the human genome. This study reveals the bifractal nature of these ... [more ▼]

We use the wavelet transform modulus maxima method to investigate the multifractal properties of strand-asymmetry DNA walk profiles in the human genome. This study reveals the bifractal nature of these profiles, which involve two competing scale-invariant (up to repeat-masked distances less than or similar to 40 kbp) components characterized by Holder exponents h(1)=0.78 and h(2)=1, respectively. The former corresponds to the long-range-correlated homogeneous fluctuations previously observed in DNA walks generated with structural codings. The latter is associated with the presence of jumps in the original strand-asymmetry noisy signal S. We show that a majority of upward (downward) jumps colocate with gene transcription start (end) sites. Here 7228 human gene transcription start sites from the refGene database are found within 2 kbp from an upward jump of amplitude Delta S >= 0.1 which suggests that about 36% of annotated human genes present significant transcription-induced strand asymmetry and very likely high expression rate. [less ▲]

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See detailLeast cost optimization of a large passenger vessel
Richir, Thomas; Losseau, Nicolas; Pircalabu, Eugen et al

in International Conference on “Advancements in Marine Structures”, (Proceedings of MARSTRUCT’2007), Edt Guedes Soares & Das, Publ: Taylor & Francis Group, UK, 12-14 March 2007 (2007, March)

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See detailL'école : rouage d'un projet démocratique ou pivot d'une société disciplinaire ?
Brausch, Géraldine ULg

Scientific conference (2007, March)

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See detailCarbon dioxide in European coastal waters
Borges, Alberto ULg; Schiettecatte, L.-S.; Abril, G. et al

Poster (2007, March)

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