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See detailRapid testosterone-induced apparent diffusion coefficient (ADC) changes in the sexually dimorphic medial preoptic nucleus of male Japanese quail.
Van Der Linden, Annemie; De Groof, Geert; Charlier, Thierry ULg et al

Poster (2006)

Testosterone (T) influences the volume and cellular characteristics of a variety of steroid-dependent brain nuclei in many vertebrates. In castrated quail, the volume of the sexually dimorphic (males ... [more ▼]

Testosterone (T) influences the volume and cellular characteristics of a variety of steroid-dependent brain nuclei in many vertebrates. In castrated quail, the volume of the sexually dimorphic (males > females) medial preoptic nucleus (POM), a key area in the control of male sexual behavior, is markedly increased by T but previous studies always assessed this effect after a period of 8-14 days and its specific time-course was unknown. We recently found that following treatment with T, the POM volume increases in a time-dependent fashion: a significant increase was already detected after only one day and the response reached it maximum (volume doubling) after 14 days of treatment. This however raised the question of the cellular mechanism underlying such a rapid brain plasticity (increase in cell size, neuropil volume, dendritic branching, extracellular space?). To research whether a change in extra- vs. intra-cellular space could be responsible for the rapid T-induced increase in POM volume, we repeatedly analyzed by in vivo diffusion-weighted magnetic resonance imaging (DW-MRI) the brain of castrated male quail before as well as after 1, 2, 7 and 14 days of T implantation. MRI was performed on a 7T-system (Bruker) using a multislice diffusion weighted-spin echo sequence. Coronal slices with an image resolution of 100*100*500µm³ were obtained covering the whole telencephalon. Images were accurately coregistered allowing voxel-wise paired comparisons of the ADC data between the different time periods. The ADC significantly increased after one day of T treatment (696±16 vs 758±30 µm²/s, p=0.011, N=5) in POM and this effect apparently persisted during the whole experiment. By contrast, T insensitive regions like the nucleus rotundus (586±170 vs 511±26 µm²/s, p-value=0.24) and nucleus mesencephalicus lateralis, pars dorsalis (934±107 vs 911±64 µm²/s, p=0.68) were not affected after the first day nor later in the experiment. These data indicate that T increases the extracellular water volume in POM specifically, either as a result of cell shrinkage or of an increase in the space between cells, and that changes in the ratio of extra- to intra-cellular water mediate, at least in part, the fast plasticity of the POM volume observed after exposure to T. [less ▲]

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See detailUsing physiological signals for sound creation
Filatriau, J. J.; Lehembre, Remy ULg; Noirhomme, Quentin ULg et al

in Proceedings of the 11-th International Conference Speech and Computer, SPECOM'2006 (2006)

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See detailUse of a serological approach for prediction of Salmonella status in an integrated pig production system
Korsak Koulagenko, Nicolas ULg; Degeye, Jean-Noel; Etienne, Grégory et al

in International Journal of Food Microbiology (2006), 108(2), 246-254

Relevance of a Salmonella serological detection technique was studied from complete results obtained from 9 pigs fattening units. Feces and overshoes were sampled at different periods after starting ... [more ▼]

Relevance of a Salmonella serological detection technique was studied from complete results obtained from 9 pigs fattening units. Feces and overshoes were sampled at different periods after starting fattening (2, 3 and 4 months) while caecal contents were taken on the slaughter line. The bacteriological technique used was based on a Diasalm enrichment and a commercial test was used for serology on an average of ten animals per batch. The aim of this work was to establish a correlation between serological results obtained at slaughter (10 samples/batch) and bacteriological results. In this context, two types of logistic regression models were tested by considering alternatively serology and Salmonella detection in caecal contents as the dependent variables. Firstly, beside the fact that all logistic regression models show weak correlations, the first finding was that positive results in overshoes taken at 2 and 3 months are slightly correlated with serological status of herds (odds-ratios of 4.96 and 2.55). Secondly, when batches were characterized as positive on the basis of serological results, the probability of Salmonella recovery in caecal contents was higher than when the batches were considered as negative (odds-ratios comprised between 4.36 and 5.81). A major conclusion is that serology can be used to follow the improvement of an integrated pig production system, but is not the unique solution for assessing risk of Salmonella shedding from specific herds. (c) 2006 Elsevier B.V. All rights reserved. [less ▲]

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See detailCaractéristiques morphologiques des juments de Trait belge
Nicks, Baudouin ULg; Delfontaine, Béatrice; Canart, Bernard et al

in Annales de Médecine Vétérinaire (2006), 150(4), 247-252

Belgian draft mares were measured when visiting their owners. The mean wither height of at least 4-year-old mares (n = 207) was 1.64 m and the girth circumference 2.22 m. Compared with the wither height ... [more ▼]

Belgian draft mares were measured when visiting their owners. The mean wither height of at least 4-year-old mares (n = 207) was 1.64 m and the girth circumference 2.22 m. Compared with the wither height, the hip height was 1 % higher (1.655 m) and the body length 8 % higher (1.775 m). The mean cannon circumference was about 30 cm. The wither height, the body length and the girth circumference of the 2-year-old mares ( n = 39) represented respectively 98 %, 96 % and 94 % of the corresponding measurements of the group of older mares ( at least 4 years old). The morphological characteristics of these last ones, compared with results published about 50 years ago, show that the wither height remained identical whereas body length and width seem to have slightly increased. [less ▲]

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See detailAdoption d’un poulain et induction de la lactation chez une ponette Welsh
Ponthier, Jérôme ULg; Deleuze, Stefan ULg

in Pratique Vétérinaire Equine (2006), 38(151), 49-53

Privé de sa mère, un poulain orphelin est handicapé dans son développement physique et comportemental. Pour la survie du poulain et son intégration au groupe, il existe des méthodes pharmacologiques ... [more ▼]

Privé de sa mère, un poulain orphelin est handicapé dans son développement physique et comportemental. Pour la survie du poulain et son intégration au groupe, il existe des méthodes pharmacologiques d’induction de la lactation et du comportement maternel. [less ▲]

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See detailThe lymphatic ring assay: a new in vitro model of lymphangiogenesis
Bruyère, F; Melen, L; Blacher, Silvia ULg et al

Poster (2006)

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See detailImpact of Mycosphaerella fijiensis toxins on banana antioxidant systems.
Busogoro, J. P.; Olivier, T.; Leiva, M. et al

Poster (2006)

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See detailA new in vitro model of Microsporum canis dermatophytosis in reconstituted feline skin
Tabart, J.; Baldo, Aline ULg; Vermout, S. et al

Conference (2006)

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See detailExplicit formula for the natural and projectively equivariant quantization
Radoux, Fabian ULg

in Letters in Mathematical Physics (2006), 78

In [Prog Theor Phys Suppl 49(3):173–196, 1999], Lecomte conjectured the existence of a natural and projectively equivariant quantization. In [math.DG/0208171, Submitted], Bordemann proved this existence ... [more ▼]

In [Prog Theor Phys Suppl 49(3):173–196, 1999], Lecomte conjectured the existence of a natural and projectively equivariant quantization. In [math.DG/0208171, Submitted], Bordemann proved this existence using the framework of Thomas–Whitehead connections. In [Lett Math Phys 72(3):183–196, 2005], we gave a new proof of the same theorem thanks to the Cartan connections. After these works, there was no explicit formula for the quantization. In this paper, we give this formula using the formula in terms of Cartan connections given in [Lett Math Phys 72(3):183–196, 2005]. This explicit formula constitutes the generalization to any order of the formulae at second and third orders soon published by Bouarroudj in [Lett Math Phys 51(4):265–274, 2000] and [C R Acad Sci Paris Sér I Math 333(4):343–346, 2001]. [less ▲]

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See detailSeismic microzonation of slopes susceptible to landsliding : Use of Ambient noise and Earthquake Ground Motion Measurements
Havenith, Hans-Balder ULg; Torgoev, Isakbek; Alvarez, Sonya et al

in Geophysical Research Abstracts (2006)

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See detailKernelizing the output of tree-based methods
Geurts, Pierre ULg; Wehenkel, Louis ULg; d Alché-Buc, Florence

in Proceedings of the 23rd International Conference on Machine Learning (2006)

We extend tree-based methods to the prediction of structured outputs using a kernelization of the algorithm that allows one to grow trees as soon as a kernel can be defined on the output space. The ... [more ▼]

We extend tree-based methods to the prediction of structured outputs using a kernelization of the algorithm that allows one to grow trees as soon as a kernel can be defined on the output space. The resulting algorithm, called output kernel trees (OK3), generalizes classification and regression trees as well as tree-based ensemble methods in a principled way. It inherits several features of these methods such as interpretability, robustness to irrelevant variables, and input scalability. When only the Gram matrix over the outputs of the learning sample is given, it learns the output kernel as a function of inputs. We show that the proposed algorithm works well on an image reconstruction task and on a biological network inference problem. [less ▲]

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See detailStudy of the modes of action of two biocontrol agents Z1 and ZH2
Drider, R.; Friel, D.; El Guilli, M. et al

Poster (2006)

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See detailLes enjeux politiques des élections communales et provinciales d’octobre 2006
Jamin, Jérôme ULg

Conference given outside the academic context (2006)

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See detailExpression of matrix metalloproteinase-2 and mutant p53 is increased in hydatidiform mole as compared with normal placenta
Petignat, P.; Laurini, R.; Goffin, Frédéric ULg et al

in International Journal of Gynecological Cancer : Official Journal of the International Gynecological Cancer Society (2006), 16(4, JUL-AUG), 1679-1684

Matrix metalloproteinases (MMPs) are group of enzymes thought to play an important role in trophoblastic and tumor invasion. The aim of our study was to investigate the trophoblastic expression of MMPs ... [more ▼]

Matrix metalloproteinases (MMPs) are group of enzymes thought to play an important role in trophoblastic and tumor invasion. The aim of our study was to investigate the trophoblastic expression of MMPs and p53 in normal trophoblast and hydatidiform moles (HM). Paraffin sections of 45 specimens, including 14 complete hydatidiform moles (CM), 15 partial hydatidiform moles (PM), 8 atypical partial hydatidiform moles (aPM), and 8 controls were selected. Classification of HM was established on histologic criteria and supported by the DNA ploidy results. Tissue sections from each case were immunostained with monoclonal antibodies, cytokeratin-7, MMP-2, MMP-9, tissue inhibitors of metalloproteinases (TIMP)-1, and p53 wild type (p53wt) and mutant types (mutp53). Staining for cytokeratin-7 revealed a positive reaction in 93% of the samples. MMP-2 was mainly expressed in the syncytiotrophoblast of HM and found in 62% of aPM, 60% PM, and 93% CM. The mutp53 was mainly and focally expressed in syncytiotrophoblastic cells and was found in 63% of aPM, 80% PM, and 93% CM. Expression of MMP-2 and mutp53 was both significantly greater in HM vs control group (P < 0.05) and greater in CM vs PM and aPM (P < 0.05). No significant difference was observed for cytokeratin-7, MMP-9, TIMP-1, and p53wt between the HM subgroups and between HM and control group. MMP-2 and mutp53 are overexpressed in HM as compared with normal trophoblast and might participate in the invasive behavior of the HM. [less ▲]

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See detailStrategy for DR-CALUX dioxin screening in feed under EC regulation
Scippo, Marie-Louise ULg; Rybertt, Soledad; Focant, Jean-François ULg et al

in Organohalogen Compounds (2006), 68

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See detailA general discontinuous Galerkin method for finite hyperelasticity. Formulation and numerical applications
Noels, Ludovic ULg; Radovitzky, Raúl

in International Journal for Numerical Methods in Engineering (2006), 68(1), 6497

A discontinuous Galerkin formulation of the boundary value problem of finite-deformation elasticity is presented. The primary purpose is to establish a discontinuous Galerkin framework for large ... [more ▼]

A discontinuous Galerkin formulation of the boundary value problem of finite-deformation elasticity is presented. The primary purpose is to establish a discontinuous Galerkin framework for large deformations of solids in the context of statics and simple material behaviour with a view toward further developments involving behaviour or models where the DG concept can show its superiority compared to the continuous formulation. The method is based on a general Hu-Washizu-de Veubeke functional allowing for displacement and stress discontinuities in the domain interior. It is shown that this approach naturally leads to the formulation of average stress fluxes at interelement boundaries in a finite element implementation. The consistency and linearized stability of the method in the non-linear range as well as its convergence rate are proven. An implementation in three dimensions is developed, showing that the proposed method can be integrated into conventional finite element codes in a straightforward manner. In order to demonstrate the versatility, accuracy and robustness of the method examples of application and convergence studies in three dimensions are provided. Copyright (c) 2006 John Wiley [less ▲]

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See detailNutritional involment in the biocontrol activity of Aureobasidium pullulans against blue mold on apples
Krimi Bencheqroun, S.; Bajji, M.; Bentata, F. et al

Poster (2006)

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