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See detailThe Ovine Callipyge Locus: A Paradigm Illustrating the Importance of Non-Mendelian Genetics in Livestock
Georges, Michel ULg; Cockett, N.

in Reproduction Nutrition Development (1996), 36(6), 651-7

An inheritable muscular hypertrophy was recently described in sheep and shown to be determined by the callipyge (CLPG) gene mapped to ovine chromosome 18. We demonstrate in this work that the callipyge ... [more ▼]

An inheritable muscular hypertrophy was recently described in sheep and shown to be determined by the callipyge (CLPG) gene mapped to ovine chromosome 18. We demonstrate in this work that the callipyge phenotype is characterized by a non-Mendelian inheritance pattern, referred to as polar overdominance, in which only heterozygous individuals having inherited the CLPG mutation from their sire express the phenotype. The possible role of parental imprinting in the determinism of polar overdominance is envisaged. [less ▲]

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See detailOvine pregnancy-associated glycoprotein profiles in ewes pregnant with singletons or twins
Vandaele, L.; Verberckmoes, S.; Van Soom, A. et al

in Reproduction in Domestic Animals (2004), 39(4), 278

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See detailOviposition preferences of Episyrphus balteatus.
Vanhaelen, Nicolas; Haubruge, Eric ULg; Gaspar, Charles ULg et al

in Mededelingen van de Faculteit Landbouwkundige en Toegepaste Biologische Wetenschappen (Rijksuniversiteit te Gent) (2001), 66(2a), 269-75

A crucial aspect of predator oviposition behaviour is host plant choice, especially in hoverflies where the newly hatched offspring are unable to move a great distance to search for the appropriate prey ... [more ▼]

A crucial aspect of predator oviposition behaviour is host plant choice, especially in hoverflies where the newly hatched offspring are unable to move a great distance to search for the appropriate prey. Such offspring must generally feed on the host plant aphids previously selected by the mother. Some factors involved in the selection of the oviposition site of Episyrphus balteatus De Geer include aphids associated to chemical stimuli, aphid colony size and host plant characteristics. Here we tested the hypothesis that there will not only be a rank order hierarchy of preference for aphid prey species reared on the same host plant but that a similar hierarchy of different host plant of one aphid species could be established. Therefore we compared the number of eggs laid on different combinations of host plant and aphid species. Vicia faba L., secondary metabolites free, Brassica napus L. and Sinapis alba L., containing low and high levels of glucosinolates respectively were used. The latter compounds are well known allelochemicals from Brassicaceae having a strong influence on specialist and generalist insects from both phytophagous and entomophagous levels. These experiments enhance the importance of tritrophic interactions in biological control of pests by underlining the host plant influence on aphidophagous predators, either directly or through the odours emitted by the phytophagous prey. [less ▲]

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See detailOvulate structure early origin and diversification: did something happen during the Givetian?
Prestianni, Cyrille ULg; Ville de Goyet, F. de; Breuer, P. et al

Conference (2006)

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See detailOwl or lark? Stroop-related cerebral activity is modulated by time of day and chronotype
Schmidt, Christina; Collette, Fabienne ULg; Sterpenich, Virginie et al

in Journal of Sleep Research (2008), 17(Suppl. 1),

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See detailOwn song selectivity in the songbird auditory pathway: Suppression by norepinephrine
Poirier, Colline; Boumans, Tiny; Vellema, Michiel et al

in PLoS ONE (2011), 6(5), 20131

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See detailOwn song selectivity in the songbird auditory pathway: suppression by norepinephrine
Poirier, Colline; Boumans, Tiny; Vellema, Michiel et al

Poster (2010)

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See detailAn own-age bias in age estimation of faces in children and adults.
Moyse, Evelyne ULg; Brédart, Serge ULg

in Perception (2010), 39(suppl), 93

The aim of the present study was to assess the occurence of an own-age bias on age estimation performance (better performance for faces from the same age range as that of the beholder) by using an ... [more ▼]

The aim of the present study was to assess the occurence of an own-age bias on age estimation performance (better performance for faces from the same age range as that of the beholder) by using an experimental design inspired from research on the own-race effect. The age of participants (10 to 14 year old children and 20 to 30 year old adults) was an independent factor that was crossed with the age of the stimuli (faces of 10 to 14 year old children and faces of 20 to 30 year old adults), the dependent measure being the accuracy of age estimation. There were 30 participants in each age group. An interaction between the two factors was expected. A two-way 2 (age of the participants)x 2 (age of the stimuli) ANOVA with repeated measures on the last factor was carried out on the accuracy scores. This analysis revealed a main effect of age of participants and of age of stimuli, and an interaction between these two factors. Children's performance was less accurate when estimating the age of adults' faces compared with children's faces. However, in both age groups, accuracy was better for children's faces than for adults' faces. [less ▲]

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See detailAn own-age bias in age estimation of faces
Moyse, Evelyne ULg; Brédart, Serge ULg

in European Review of Applied Psychology = Revue Européenne de Psychologie Appliquée (2012), 62(1), 3-7

Introduction. - Age estimation performances may be influenced by group biases. Objective. - This study investigated whether we are more accurate at estimating the age of people from one's own-age than the ... [more ▼]

Introduction. - Age estimation performances may be influenced by group biases. Objective. - This study investigated whether we are more accurate at estimating the age of people from one's own-age than the age of younger or older people. Method. - Children, young and older adults’ performances at estimating both in-group and out-group faces were compared. Results. - A significant “Age of participants” × “Age of face stimuli” interaction was revealed. Moreover, the age of children's faces was more accurately estimated than the age of young and older adults’ faces by the three groups of participants. Conclusion. - The present results revealed the occurrence of an own-age bias for children, young and older adults in age estimation. Several explanations to this own-age effect are discussed. [less ▲]

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See detailThe own-age bias in age estimation of voices
Beaufort, Aline ULg; Moyse, Evelyne ULg; Brédart, Serge ULg

Poster (2012, May)

Recently, it has been evidenced that age estimation performance may be influenced by an own-age bias, i.e. we can estimate more accurately the age of one’s own-age people than the age of other age people ... [more ▼]

Recently, it has been evidenced that age estimation performance may be influenced by an own-age bias, i.e. we can estimate more accurately the age of one’s own-age people than the age of other age people (George & Hole, 1995). To the best of our knowledge, all the studies that investigated the own-age bias used faces as stimuli. However, there are situations in which the voice is the only information available in order to estimate a person’s age (Cerrato et al., 2000). In the present study, the occurrence of an own-age bias in age estimation from voices was assessed by using an experimental design in which the age of participants (young vs old people) and the age of face stimuli (young vs old people) are crossed. Although we did not observe a crossed interaction where each age group would have been more accurate for in-group estimation than for out-group estimation, present results revealed the occurrence of an own-age bias in age estimation in younger adults only. Indeed young participants made smaller absolute errors than older participants when estimating the age of young voices. However, there was no significant difference between age groups when the age of older voices was estimated. [less ▲]

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See detailOwn-song recognition in the songbird auditory pathway: selectivity and lateralization.
Poirier, Colline; Boumans, Tiny; Verhoye, Marleen et al

in Journal of Neuroscience (2009), 29(7), 2252-8

The songbird brain is able to discriminate between the bird's own song and other conspecific songs. Determining where in the brain own- song selectivity emerges is of great importance because experience ... [more ▼]

The songbird brain is able to discriminate between the bird's own song and other conspecific songs. Determining where in the brain own- song selectivity emerges is of great importance because experience-dependent mechanisms are necessarily involved and because brain regions sensitive to self-generated vocalizations could mediate auditory feedback that is necessary for song learning and maintenance. Using functional MRI, here we show that this selectivity is present at the midbrain level. Surprisingly, the selectivity was found to be lateralized toward the right side, a finding reminiscent of the potential right lateralization of song production in zebra finches but also of own-face and own-voice recognition in human beings. These results indicate that a midbrain structure can process subtle information about the identity of a subject through experience-dependent mechanisms, challenging the classical perception of subcortical regions as primitive and nonplastic structures. They also open questions about the evolution of the cognitive skills and lateralization in vertebrates. [less ▲]

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See detailOwner motivation
Diez, Marianne ULg

in Clinical Update (2009), 9

Completing a successfull dog weight loss programme can be difficult both for vet and owner. Adopting a step-by-step approach combining available tools and vet's resources can lead to success.

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See detailOwnership Structure and Stock Market Liquidity in France
Ajina, Aymen ULg; Lakhal, Faten

in Bankers, Markets, Investors [=BMI] (2010), 104

This paper examines the effects of concentrated ownership structure and shareholder’s type on the French stock-market liquidity. The results show that ownership concentration negatively affects market ... [more ▼]

This paper examines the effects of concentrated ownership structure and shareholder’s type on the French stock-market liquidity. The results show that ownership concentration negatively affects market liquidity suggesting that large shareholders are likely to exacerbate information asymmetry, widen bid-ask spreads and decrease stock market liquidity. The findings also show that the proportion of institutional investors has a positive effect on market liquidity. These investors are inclined to trade more frequently on their stocks and to shrink bid-ask spreads. These findings are in line with adverse selection and trading hypotheses and shed the light on the role of corporate governance devices to consider shareholder minority interest’s protection, which leads to improved stock market liquidity levels. [less ▲]

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See detailOwnership vs. Accountability, ou le contrôle des fonds de l’aide au développement
Paul, Elisabeth ULg

in Reflets et Perspectives de la Vie économique (2003), XLII(2), 29-43

The paper reviews the major changes observed in the mechanisms used to channel aid to developing countries. As the most recent PRGF approach places the emphasis on the need for a coherent framework (the ... [more ▼]

The paper reviews the major changes observed in the mechanisms used to channel aid to developing countries. As the most recent PRGF approach places the emphasis on the need for a coherent framework (the PRSP), a certain number of prerequisite on the management side of public expenditure need to be met. The paper reviews some of the most important aspects, in particular the need for better controls in the budgetary process. The paper uses a principal-agent approach to compare the impact of internal and external (audit) controls on the efficiency of service delivery and draws policy implications. [less ▲]

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See detailOXA carbapenemase and their inhibition
Kerff, Frédéric ULg

Conference (2010, April 13)

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See detailOXA-198, an acquired carbapenem-hydrolyzing class D beta-lactamase from Pseudomonas aeruginosa.
El Garch, Farid; Bogaerts, Pierre; Bebrone, Carine ULg et al

in Antimicrobial Agents and Chemotherapy (2011), 55(10)

A carbapenem-resistant Pseudomonas aeruginosa strain (PA41437) susceptible to expanded-spectrum cephalosporins was recovered from several consecutive lower-respiratory-tract specimens of a patient who ... [more ▼]

A carbapenem-resistant Pseudomonas aeruginosa strain (PA41437) susceptible to expanded-spectrum cephalosporins was recovered from several consecutive lower-respiratory-tract specimens of a patient who developed a ventilator-associated pneumonia while hospitalized in an intensive care unit. Cloning experiments identified OXA-198, a new class D β-lactamase which was weakly related (less than 45% amino acid identity) to other class D β-lactamases. Expression in Escherichia coli TOP10 and in P. aeruginosa PAO1 led to transformants that were resistant to ticarcillin and showed reduced susceptibility to carbapenems and cefepime. The bla(OXA-198) gene was harbored by a class 1 integron carried by a ca. 46-kb nontypeable plasmid. This study describes a novel class D β-lactamase involved in carbapenem resistance in P. aeruginosa. [less ▲]

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See detailOxford Centre for Evidence‐Based Medicine 2011 Levels of Evidence ‐ Traduction française
OCEBM Levels of Evidence Working Group; Durieux, Nancy ULg; Pasleau, Françoise ULg et al

E-print/Working paper (2012)

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See detailOxidant activity of rabbit synoviocytes (HIG-82) demonstrated by oxymetry and ethylene production.
Schneider, Nicole ULg; Lejeune, Jean-Philippe ULg; Mouithys-Mickalad, Ange ULg et al

Poster (2003)

We are interested in a possible role of synoviocytes in the ROS production implicated in osteoarthritis, therefore we studied the response of a rabbit synoviocyte cell line (HIG-82) to variable oxygen ... [more ▼]

We are interested in a possible role of synoviocytes in the ROS production implicated in osteoarthritis, therefore we studied the response of a rabbit synoviocyte cell line (HIG-82) to variable oxygen tensions and the oxidant activity of these cells in response to stimuli. Synoviocytes were cultured at 5 and 21 % O2, their O2 consumption (cellular respiration, monitored with Clark electrode) was measured at 21% O2 and after anoxia, before and after stimulation with phorbol myristate acetate (PMA), and their oxidant response to PMA stimulation was quantified by measuring ethylene (gas chromatography) released when the substrate, alpha-keto-gamma-methylbutyric acid, is oxidised by the ROS produced by the cells. Cell growth was faster at 21 % O2 than at 5% O2, and microscopic observation revealed 2 cell populations: a few small round cells in suspension and many adherent cells. By oxymetry, we observed that a 106 synoviocytes suspension in 2 ml completely consumed O2 within 15 min, that anoxia (7 min) slightly slowed the respiration rate down and that PMA stimulation increased O2 consumption (150 % increase). The oxidant activity (ethylene production) of the cells was stimulated by PMA in a dose-dependent manner (10-9 to 10-7M) but the cell response was highly variable (from 150 to 1500 % increase) and was largely reduced by diphenyliodonium, an inhibitor of NADPH-oxidase and NO-synthase. The capacity to produce free radical species was confirmed for the small round cells by detection of an electron paramagnetic resonance (EPR) signal after stimulation. These results thus demonstrate a sensibility to O2 and an oxidant activity of synoviocytes at least related to ROS production by NADPH-oxidase activity. [less ▲]

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