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See detailMeeting report. Topics in ecology: structure and function of plants and ecosystems.
Bogaert, Jan ULg

in IALE Bulletin (2000), 18(6), 4

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See detailMéfions-nous du "Tueur silencieux"
Krzesinski, Jean-Marie ULg

Speech (2010)

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See detailMEG source localization under multiple constraints: An extended Bayesian framework
Mattout, J.; Phillips, Christophe ULg; Penny, W. D. et al

in Neuroimage (2006), 30(3), 753-767

To use Electroencephalography (EEG) and Magnetoencephalography (MEG) as functional brain 3D imaging techniques, identifiable distributed source models are required. The reconstruction of EEG/MEG sources ... [more ▼]

To use Electroencephalography (EEG) and Magnetoencephalography (MEG) as functional brain 3D imaging techniques, identifiable distributed source models are required. The reconstruction of EEG/MEG sources rests on inverting these models and is ill-posed because the solution does not depend continuously on the data and there is no unique solution in the absence of prior in formation or constraints. We have described a general framework that can account for several priors in a common inverse solution. An empirical Bayesian framework based on hierarchical linear models was proposed for the analysis of functional neuroimaging data [Friston, K., Penny, W, Phillips, C., Kiebel, S., Hinton, G., Ashburner, J., 2002. Classical and BaN inference in neuroitnaging: theory. Neurolmage 16, 465-483] and was evaluated recently in the context of EEG [Phillips, C., Mattout, J., Rugg, M.D., Maquet, P., Friston, K., 2005. An empirical Bayesian solution to the source reconstruction problem in EEG. Neurolmage 24, 997-1011]. The approach consists of estimating the expected source distribution and its conditional variance that is constrained by an empirically determined mixture of prior variance components. Estimation uses Expectation-Maximization (EM) to give the Restricted Maximum Likelihood (ReML) estimate of the variance components (in terms of hyperparameters) and the Maximum A Posteriori (MAP) estimate of the source parameters. In this paper, we extend the framework to compare different combinations of priors, using a second level of inference based on Bayesian model selection. Using Monte- Carlo simulations, ReML is first compared to a classic Weighted Minimum Norm (WMN) solution under a single constraint. Then, the ReML estimates are evaluated using various combinations of priors. Both standard criterion and ROC-based measures were used to assess localization and detection performance. The empirical Bayes approach proved useful as: (1) ReML was significantly better than WMN for single priors; (2) valid location priors improved ReML source localization; (3) invalid location priors did not significantly impair performance. Finally, we show how model selection, using the log-evidence, can be used to select file best combination of priors. This enables a global strategy for multiple prior-based regularization of the MEG/EEG source reconstruction. (c) 2005 Elsevier Inc. All rights reserved. [less ▲]

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See detailLes mégapoles face au défi démographique
Dawans, Stéphane ULg

Conference given outside the academic context (2012)

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See detailThe Megaprojects in the Arabic World: A Reading through Conception and Engineering Operators
Aoun, Oula ULg

Diverse speeche and writing (2012)

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See detailUne mégaspore de grande taille au sommet du Givétien, à Sart-Dames-Avelines.
Stockmans, F; Streel, Maurice ULg

in Annales de la Société Géologique de Belgique (1969), 92(1), 47-50

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See detailThe Mehler reaction in Chlamydomonas during photosynthetic induction and steady-state photosynthesis in wild-type and in a mitochondrial mutant
Franck, Fabrice ULg; Houyoux, Pierre-Alain

in Allen, J. F.; Gantt, E.; Golbeck, J. H. (Eds.) et al Photosynthesis: Energy from the Sun (2008)

The effects of fast O2-removal on electron transport rate (ETR), measured by chlorophyll fluorescence, were investigated in C. reinhardtii. In wild-type, O2-removal caused a strong decrease in ETR during ... [more ▼]

The effects of fast O2-removal on electron transport rate (ETR), measured by chlorophyll fluorescence, were investigated in C. reinhardtii. In wild-type, O2-removal caused a strong decrease in ETR during photosynthetic induction due to the absence of Mehler reaction. Light-saturation curves of the O2-dependent electron flow were established in different conditions. O2-dependent electron flow was triggered within a few seconds and amounted to up to 80 % of total electron flow during photosynthetic induction in algae grown on minimal medium, while it represented less than 15 % at steady-state. It was significantly weaker in the presence of acetate and in a mutant devoided of mitochondrial complexes I and III. Measurements of the light-induced changes of 820nm transmission in the s time-range show that in wild-type the O2-dependent electron flow leads to complete re-oxidation of PSI donor side in saturating light. [less ▲]

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See detailUne meilleure connaissance scientifique des psychotropes permet-elle un meilleur usage éthique en pédopsychiatrie
Scholl, Jean-Marc ULg

Conference given outside the academic context (2008)

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See detailMeiofauna and harpacticoid copepods in different habitats of a Mediterranean seagrass meadow
Mascart, Thibaud ULg; Lepoint, Gilles ULg; De Troch, Marleen

in Journal of the Marine Biological Association of the United Kingdom (2013), 93(06), 1557-1566

This study investigated whether associated meiobenthic communities, especially harpacticoid copepods differed, amongst habitats. Five pre-defined habitats within and next to the Posidonia oceanica ... [more ▼]

This study investigated whether associated meiobenthic communities, especially harpacticoid copepods differed, amongst habitats. Five pre-defined habitats within and next to the Posidonia oceanica seagrass meadow were sampled: living seagrass canopy leaves (LL), small (SMF) and large (LMF) macrophytodetritus fragments accumulations and sand, bare (BS) and covered (CS). The highest meiofauna abundances were recorded in the BS for the core sampled habitats (BS, CS, SMF and LMF) and in the LMF for seagrass material habitats (SMF, LMF and LL). Harpacticoid copepods were the most abundant taxon in all habitats. The assemblage composition at copepod family level showed two distinct habitats clusters: a leaf (LMF and LL) and a sediment cluster (BS, CS and SMF). Subsequently, stable isotope analyses were conducted to analyse the relationship between copepods and their potential food sources in seagrass material habitats. Based on δ13C isotopic analyses and SIAR mixing model, harpacticoid copepods relied for 70% on epiphytes and for 30% on P. oceanica leaf material in the LMF and LL habitats. [less ▲]

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See detailLa méiose chez la femelle de mammifère
Ectors, Fabien ULg; Koulischer, Lucien

in Popescu, Paul; Hayes, Hélène; Dutrillaux, Bernard (Eds.) Techniques de cytogénétique animale (1998)

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See detailMeiotic Analysis of the Germplasm of three Medicinal Species from the Asteraceae Family
Olkoski, D; Laughinghouse IV, Haywood ULg; Silva, ACF et al

in Ciencia Rural (2008), 38(6), 1777-1780

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See detailMeiotic segregation analysis in cow heterozygotes for the t(1;29) Robertsonian translocation
Bonnet-Garnier, A; Lacaze, S; Beckers, Jean-François ULg et al

in Chromosome Research : An International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology (2007), 15(2), 87

Heterozygotes for Robertsonian translocations have usually a normal phenotype but show variable decrease in fertility. In humans, meiotic segregation studies carried out in male carriers reveal a majority ... [more ▼]

Heterozygotes for Robertsonian translocations have usually a normal phenotype but show variable decrease in fertility. In humans, meiotic segregation studies carried out in male carriers reveal a majority of balanced spermatozoa. The rate of unbalanced segregation products appears higher in females than in males, but the number of human oocytes analysed so far remains limited (about 100). The occurrence of the t(1;29) translocation in several cattle breeds makes bovines an interesting animal model to study the meiotic segregation in female carrier of Robertsonian translocations. The aim of our project is thus to assess the rates of unbalanced oocytes produced by four cows and to compare these values with those obtained in bulls carriers of the same translocation. The superstimulated cows were subjected to twenty um pick up (OPU) sessions. Dual colour whole chromosome painting probes for BTA1 and 29 were hybridized on oocytes preparations. To date, 649 oocytes have been matured in vitro and 500 successfully spread. Among the 266 oocytes analysed by FISH so far: 201 (75,5%) are balanced, including 105 translocated and 96 normal, 55 are diploid (20.7%), and 10 unbalanced (3.8%). The proportion of balanced oocytes is lower than the average proportion of balanced spermatozoa estimated for two heterozygous bulls (97.1%). This difference is essentially due to a higher rate of diploid oocytes (20.7% vs 0.04% diploid spermatozoa). The origin of observed differences in the segregation profiles of the two sexes, as well as the practical implications of these results for genetic counselling and cattle breeding are discussed. [less ▲]

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See detailMeiotic segregation analysis in cows carrying the t(1;29) Robertsonian translocation.
Bonnet-Garnier, A; Lacaze, S; Beckers, Jean-François ULg et al

in Cytogenetic & Genome Research (2008), 120

Heterozygous carriers of Robertsonian translocations generally have a normal phenotype but present reproductive failure. In cattle, the t(1;29) Robertsonian translocation is very common and carriers show ... [more ▼]

Heterozygous carriers of Robertsonian translocations generally have a normal phenotype but present reproductive failure. In cattle, the t(1;29) Robertsonian translocation is very common and carriers show a 3-5% decrease in fertility. Some data suggest that female carriers have a higher decrease than male carriers but no direct studies of the chromosome content of oocytes from a t(1;29) carrier cow have been performed so far. Four heterozygous carrier cows underwent hormonal stimulations and follicles punctions and about 800 oocytes were matured in vitro. Six hundred metaphase II preparations were obtained and analysed by fluorescent in situ hybridization with bovine chromosome 1 and 29 painting probes. Proportions of different kinds of oocytes were assessed: 74.11% (292/394) were normal and balanced, 4.06% (16/394) unbalanced and 21.83% (86/394) diploid. For all cows, the number of normal oocytes was not significantly different from the number of translocated oocytes but the diploidy and unbalanced rate were significantly different between them. As found in bulls, the meiotic segregation pattern in cows has shown a preponderance of alternate products. However, the frequency of unbalanced gametes determined in females (4.06%) was significantly higher than the frequency observed in males (2.76%). The divergence in the rate of diploid gametes (0.04% vs. 21.83%) is mainly explained by the difference between males and females. [less ▲]

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See detailHet meisje dat ik Ursula noem. Paul van Ostaijens 'Jong landschap' re-revisited
Spinoy, Erik ULg

in Kunst & Cultuur (1996), 29(2), 16-20

This is a rereading of a famous late poem by the Flemish expressionist Paul van Ostaijen.

Detailed reference viewed: 75 (1 ULg)