References of "2012"
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See detailDe l'arbitrage institutionnel
Caprasse, Olivier ULg

in Hommage à Guy Keutgen pour son action de promotion de l'arbitrage (2012)

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See detailImpact of rhizosphere factors on cyclic lipopeptide signature from the plant beneficial strain Bacillus amyloliquefaciens S499
Nihorimbere, Venant; Cawoy, Hélène ULg; Seyer, Alexandre et al

in FEMS Microbiology Ecology (2012), 79

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See detailSperm quality analysis in XX, XY and YY males of the Nile tilapia (Oreochromis niloticus).
Gennotte, Vincent ULg; François, Ekniel; Rougeot, Carole ULg et al

in Theriogenology (2012)

In Nile tilapia (Oreochromis niloticus), individuals with atypical sexual genotype are commonly used in farming (use of YY males to produce all-male offsprings), but they also constitute major tools to ... [more ▼]

In Nile tilapia (Oreochromis niloticus), individuals with atypical sexual genotype are commonly used in farming (use of YY males to produce all-male offsprings), but they also constitute major tools to study sex determinism mechanisms. In other species, sexual genotype and sex reversal procedures affect different aspects of biology such as growth, behaviour and reproductive success. The aim of this study was to assess the influence of sexual genotype on sperm quality in Nile tilapia. Milt characteristics were compared in XX (sex-reversed), XY and YY males in terms of gonadosomatic index, sperm count, sperm motility and duration of sperm motility. Sperm motility was measured by computer-assisted sperm analysis (CASA) quantifying several parameters: total motility, progressive motility, curvilinear velocity, straight line velocity, average path velocity and linearity. None of the sperm trait measured differed significantly between the three genotypes. Mean values of gonadosomatic index, sperm concentration and sperm motility duration of XX, XY and YY males respectively ranged from 0.92 to 1.33 %, from 1.69 to 2.22 × 10(9) cells mL-1 and from 18’04’’ to 27’32’’. Mean values of total motility and curvilinear velocity 1 min after sperm activation respectively ranged from 53 to 58 % and from 71 to 76 µm s-1 for the three genotypes. After 3 min of activity, all the sperm motility and velocity parameters dropped by half and continued to slowly decrease thereafter. Seven min after activation, only 9 to 13 % of spermatozoa were still progressive. Our results prove that neither sexual genotype nor hormonal sex reversal treatments affect sperm quality in male Nile tilapias with atypical sexual genotype. [less ▲]

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See detailA Riemannian geometry for low-rank matrix completion
Mishra, Bamdev ULg; Karavadi, Adithya Apuroop; Sepulchre, Rodolphe ULg

E-print/Working paper (2012)

We propose a new Riemannian geometry for fixed-rank matrices that is specifically tailored to the low-rank matrix completion problem. Exploiting the degree of freedom of a quotient space, we tune the ... [more ▼]

We propose a new Riemannian geometry for fixed-rank matrices that is specifically tailored to the low-rank matrix completion problem. Exploiting the degree of freedom of a quotient space, we tune the metric on our search space to the particular least square cost function. At one level, it illustrates in a novel way how to exploit the versatile framework of optimization on quotient manifold. At another level, our algorithm can be considered as an improved version of LMaFit, the state-of-the-art Gauss-Seidel algorithm. We develop necessary tools needed to perform both first-order and second-order optimization. In particular, we propose gradient descent schemes (steepest descent and conjugate gradient) and trust-region algorithms. We also show that, thanks to the simplicity of the cost function, it is numerically cheap to perform an exact linesearch given a search direction, which makes our algorithms competitive with the state-of-the-art on standard low-rank matrix completion instances. [less ▲]

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See detailAspects neurologiques associés au Syndrome de Down
Vaessen; Daron, aurore; DUBRU, Jean-Marie ULg et al

in Tijdschrift van de Belgische Kinderarts = Journal du Pédiatre Belge (2012), 14(2), 40-43

Summary : Down syndrome is one of best caracterized genetic syndromes. Its phenotype includes specific morphological features, mental retardation and several organic impairments such as cardiac ... [more ▼]

Summary : Down syndrome is one of best caracterized genetic syndromes. Its phenotype includes specific morphological features, mental retardation and several organic impairments such as cardiac malformations, cutaneous disorders and immunologic abnormalities. Beside these disturbances neurological disorders have been less considered or thought to be the expression of the mental retardation. However it is important to pay attention to the high incidence of epilepsy such as West syndrome in infants and “Late-Onset of myoclonic epilepsy in Down Syndrome” in the adult. They might required specific treatment. ADHD as well as autistic behavior may be difficult to diagnose especially in children with severe mental retardation. They need precise attention and rigourous follow-up of their treatment. [less ▲]

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See detailFinding the bottleneck: a research strategy for improved biomass production
Bassi, Roberto; Cardol, Pierre ULg; Choquet, Yves et al

in Posten, Clemens; Walter, Christian (Eds.) Microalgal Biotechnology: integration and economy (2012)

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See detailLiver Transplantation in a Patient With an Intraabdominally Located Left Ventricular Assist Device : Surgical Aspects - Case Report
VERMEER, N; MEURISSE, Nicolas ULg; VLASSELAERS, D et al

in Transplantation Proceedings (2012), 44

Abstract : The presence of a cardiac assist device in a liver transplantation candidate should not be considered to be an absolute contraindication to transplantation. In this first case report of liver ... [more ▼]

Abstract : The presence of a cardiac assist device in a liver transplantation candidate should not be considered to be an absolute contraindication to transplantation. In this first case report of liver transplantation in a patient with an intraabdominally located left ventricular assist device, we have described the surgical aspects and discussed the timing of the liver transplantation and the removal of the left ventricular assist device. [less ▲]

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See detailHistoire de la Hesbaye liégeoise. Epoque contemporaine
Lanneau, Catherine ULg; Driesmans, Marcel

in Lange, Claude (Ed.) Histoire de la Hesbaye liégeoise (2012)

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See detailCommunity assembly along a soil depth gradient: contrasting patterns of plant trait convergence and divergence in a Mediterranean rangeland
Bernard-Verdier, Maud; Navas, Marie-Laure; Vellend, Mark et al

in Journal of Ecology (2012), (100), 1422-1433

1. Understanding how environmental factors drive plant community assembly remains a major challenge in community ecology. The strength of different assembly processes along environmental gradients, such ... [more ▼]

1. Understanding how environmental factors drive plant community assembly remains a major challenge in community ecology. The strength of different assembly processes along environmental gradients, such as environmental filtering and functional niche differentiation, can be quantified by analysing trait distributions in communities. While environmental filtering affects species occurrence among communities, functional divergence or convergence is strongly related to species abundances within communities, which few studies have taken into account. We examine the trait-mediated effect of these two processes along a stress-resource gradient. 2. We measured species abundances and the distributions of eight traits related to vegetative and regenerative phases in plant communities along a gradient of soil depth and resource availability in Mediterranean rangelands. We quantified environmental filtering, defined as a local restriction of trait range, and trait divergence, based on abundance-weighted trait variance, using a two-step approach with specifically designed null models. 3. Communities presented a clear functional response to the soil gradient, as evidenced by strong trends in community-weighted trait means. We detected environmental filtering of different traits at both ends of the gradient, suggesting that, contrary to widespread expectations, trait filtering may not necessarily be the result of abiotic filtering under harsh conditions but could likely also result from biotic interactions in productive habitats. 4. We found marked shifts in trait abundance distributions within communities along the gradient. Vegetative traits (e.g. leaf dry matter content) diverged on shallow soils, reflecting the coexistence of distinct water- and nutrient-use strategies in these constrained habitats and converged with increasing soil resource availability. By contrast, regenerative traits (e.g. seed mass) tended to diverge towards deeper soils, while plant reproductive heights diverged all along the gradient. 5. Synthesis: Our study highlights how the combination of abundance data with traits capturing different functional niches is critical to the detection of complex functional responses of plant communities to environmental gradients. We demonstrate that patterns of trait divergence and filtering are strongly contingent on both trait and environment such that there can be no expectation of a simple trend of increasing or decreasing functional divergence along a gradient of resource availability. [less ▲]

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See detailElectrophysiology and disorders of consciousness
Noirhomme, Quentin ULg; Lehembre, Remy ULg

in Schnakers, Caroline; Laureys, Steven (Eds.) Coma and disorders of consciousness (2012)

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See detailEtude descriptive des caractéristiques morphométriques et génitales de la chèvre de Lubumbashi en République Démocratique du Congo.
Ngona, Idi; Beduin, Jean-Marie ULg; Khangmate, Faustin et al

in Revue d'Elévage et de Médecine Vétérinaire des Pays Tropicaux (2012), 65(3-4), 75-79

L’étude a pour but de préciser les caractéristiques zootechniques et de reproduction des chèvres (n = 1311) et boucs (n = 346) abattus à Lubumbashi. La taille au garrot, la longueur corporelle et le poids ... [more ▼]

L’étude a pour but de préciser les caractéristiques zootechniques et de reproduction des chèvres (n = 1311) et boucs (n = 346) abattus à Lubumbashi. La taille au garrot, la longueur corporelle et le poids vif ont été respectivement de 53 cm, 77 cm et 20,5 kg chez les femelles et de 53 cm, 71 cm et 19 kg chez les mâles. Le poids des testicules gauches et droits, le diamètre moyen des testicules et le périmètre scrotal ont été respectivement de 67,3 g, 66,9g, 12cm et 21,1cm. La longueur moyenne du tractus génital mesuré de la vulve à l’extrémité de la corne a été de 30,3 cm. Le poids moyen des ovaires, la longueur et largeur des ovaires gauche et droit ont été respectivement de 1,1 g, 1,8 x 1,3 cm et 1,7 x 1,3 cm. Aucune structure kystique n’a été observée sur les ovaires. Quarante-quatre pourcent des femelles abattues se sont révélées gravides. Sur base de la comparaison du nombre de corps jaunes et de celui des embryons ou fœtus présents dans l’utérus, les mortalités embryonnaires ont été estimées à 19,2 %. [less ▲]

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See detailImproving Generalization for 3D Object Categorization with Global Structure Histograms
Madry, Marianna; Ek, Carl Henrik; Detry, Renaud ULg et al

in IEEE/RSJ International Conference on Intelligent Robots and Systems (2012)

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See detailMieux comprendre et évaluer la réserve en eau des sols forestiers
Ridremont, François ULg; Degré, Aurore ULg; Claessens, Hugues ULg

in Forêt Wallonne (2012), 116

La ressource en eau constitue un des facteurs déterminants de l’adaptation de nos écosystèmes forestiers aux bouleversements climatiques annoncés. L’évaluation de la réserve en eau des sols devrait amener ... [more ▼]

La ressource en eau constitue un des facteurs déterminants de l’adaptation de nos écosystèmes forestiers aux bouleversements climatiques annoncés. L’évaluation de la réserve en eau des sols devrait amener à une meilleure perception de la vulnérabilité des stations forestières au stress hydrique et à des recommandations de gestion plus précises quant au choix des essences à implanter et aux techniques de sylviculture. Cet article introductif rappelle quelques fondamentaux concernant l’économie en eau d’un sol et la capacité des arbres à puiser l’eau stockée. [less ▲]

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See detailCompte rendu de Pauliina REMES, "Neoplatonism"
Gavray, Marc-Antoine ULg

in Revue Philosophique de Louvain (2012), (1), 159-161

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