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See detailFacteurs de risques de mammites liés au diagnostic et aux traitements
Theron, Léonard ULg

Article for general public (2009)

La mammite est une pathologie aux conséquenceséconomiques redoutables dont le contrôle est difficile. Une étude réalisée par OSaM (l’observatoire de la santémammaire) dans 350 fermes a permis de ... [more ▼]

La mammite est une pathologie aux conséquenceséconomiques redoutables dont le contrôle est difficile. Une étude réalisée par OSaM (l’observatoire de la santémammaire) dans 350 fermes a permis de quantifier de la situation sanitaire mammaire, de mieux cerner les pratiques d’élevage les plus propices à une bonne maîtrise des infections mammaires et de proposer des recommandations de nature plus préventives. Ce premier article propose une synthèse des conclusions tirées en matière de diagnostic et de traitement. [less ▲]

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See detailLes Facteurs de risques de rupture du ligament croisé antérieur du genou : l’état neuro-musculaire
Kaux, Jean-François ULg; Delvaux, François ULg; Forthomme, Bénédicte ULg et al

in Journal de Traumatologie du Sport (2013), 30(4), 248-252

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See detailLes facteurs de succès dans l'accompagnement du portage à distance de cours
Delfosse, Catherine ULg; Harmeling, Danielle; Poumay, Marianne ULg et al

in Actes du Colloque des deuxièmes rencontres du Kirchberg. (2003, January)

This paper presents a reflection about the key success factors involved in the process of turning traditional courses into on-line active courses. Within the context of ‘FORMADIS’ and other programmes ... [more ▼]

This paper presents a reflection about the key success factors involved in the process of turning traditional courses into on-line active courses. Within the context of ‘FORMADIS’ and other programmes, more than twenty projects have been accompanied by the LabSET in the past 3 years. The paper gives an overview of the tools and methods used for teacher support and training. It examines the projects ‘doing well’ and analyse what makes them sucessful. It considers the moment at which the success factors take place (before, during and after the various phases of development). It illustrates these key factors with practical examples. Whereas the majority of these factors seem to be obvious, this analysis will help considering the relations between them as well as the way of managing them successfully. [less ▲]

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See detailFacteurs de variabilité spatiale des caractéristiques des débits minimums annuels des rivières wallonnes (Belgique)
Vadnais, Marie-Ève; Assani, Ali A.; Hallot, Eric ULg et al

in Revue des Sciences de l'Eau = Journal of Water Science (2011), 24(3), 311-327

The goal of this study was to determine which environmental factors affect the spatial variability of annual minimum streamflow characteristics for 34 rivers in Wallonia (Belgium) using two complementary ... [more ▼]

The goal of this study was to determine which environmental factors affect the spatial variability of annual minimum streamflow characteristics for 34 rivers in Wallonia (Belgium) using two complementary methods: theascending hierarchical classification method and the linear correlation method. Both methods were applied after principal component analysis transformation was applied to the data. The ascending hierarchical classification method (Ward’s method) identified the effect of lithology and anthropogenic activity (groundwater pumping) on the fundamental characteristics of annual minimum flows. Rivers that drain a relatively permeable substrate are characterized by very high flow volumes with low interannual variability, high interannual variability of the period of occurrence, and small asymmetry coefficients. Rivers that drain low permeability or impermeable substrates show the opposite patterns. Rivers in which flow is subjected to artificial influences are characterized by greater variability of the magnitude and of the period of occurrence of annual minimum flows than natural rivers. Analysis of linear correlations between streamflow characteristics and environmental factors highlighted a correlation between the form of the distribution curves of annual minimum flows and several environmental factors (climate, land use, location and physiographic characteristics of the watersheds). [less ▲]

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See detailFacteurs de variation non génétique de la productivité des brebis de race Noire de Thibar
Ben Salem, Imène; Rekik, Mourad; Hammami, Hedi ULg et al

in Revue d'Elévage et de Médecine Vétérinaire des Pays Tropicaux (2009), 62(1), 59-66

An initial database containing growth records of 101,000 lambs obtained within the context of the national meat sheep improvement program was used to quantify reproductive and productivity (total litter ... [more ▼]

An initial database containing growth records of 101,000 lambs obtained within the context of the national meat sheep improvement program was used to quantify reproductive and productivity (total litter weight) traits of ewes of the Noire de Thibar breed, and to determine the influence of non-genetic factors on these traits. A database was then generated: it comprised 64,137 lambings over a 12-year period (1991-2002), and 25 farms and 48 flocks. The mean fertility rate in the flocks was 80.1±12.9% with highly significant effects (p<0.001) of the farm and lambing year. At birth, the average litter size per lambing ewe was 1.32±0.47. It dropped to 1.23±0.55 at 70 days after lambing. All main sources of variation (farm, lambing year, lambing month, and dam age) retained in the model as well as their interactions significantly affected the litter size at different stages after lambing. Survival of all the lambs in the litters between birth and 70 days post-lambing was observed in 89.9% of the ewes. Entire loss of the litter was observed in only 5.8% of the ewes. An analysis of variance revealed that factors such as the lambing year, lambing month, dam age, sex of the litter, and litter size at birth had a highly significant effect on the proportions of ewes with different levels of lambs' survival within litters. On average, the productivity of the Noire de Thibar was 6.6±2.2, 10.3±3.5 and 18.6±6.6 kg at 10, 30 and 70 days after lambing, respectively. The main factors of variation (farm, lambing year, lambing month, dam age, litter size), and some second-level interactions had highly significant effects (p<0.001) on the studied productivity traits. Ewes aged four years and which had male triplets yielded the highest productivities at 70 days after lambing. This preliminary work on the reproductive and productivity traits of Noire de Thibar ewes is essential to develop a ewe selection index as part of a genetic improvement scheme for this breed. [less ▲]

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See detailLes facteurs de virulence d’Actinobacillus pleuropneumoniae, l’agent étiologique de la pleuropneumonuie porcine
Vanden Bergh, Philippe ULg; Fett, Thomas ULg; Zecchinon, Laurent ULg et al

in Annales de Médecine Vétérinaire (2008), 152(2), 74-96

Porcine pleuropneumonia caused by Actinobacillus pleuropneumoniae is a frequent and highly infectious disease generating significant economic losses related to deficiency in zootechnical profits and ... [more ▼]

Porcine pleuropneumonia caused by Actinobacillus pleuropneumoniae is a frequent and highly infectious disease generating significant economic losses related to deficiency in zootechnical profits and intensive use of antibiotics. This synthesis aims to review the bacterium elements necessary to pathogenesis development. At first time, we describe activation, secretion and cytotoxic action of Apx toxins, recognized as A. pleuropneumoniae major virulence factors. Then, we develop the other ones which are the lipopolysaccharides, the polysaccharidic capsule, the fimbriae, iron and other nutrients capture systems, various proteases, installation of certain metabolic ways, flagella and the biofilm. [less ▲]

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See detailLes facteurs de virulence des alphaherpèsvirus
Muylkens, Benoît ULg; Meurens, François; Schynts, Frédéric et al

in Virologie (2003), 7

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See detailFacteurs de virulence et phénotypes de soixante et une souches d'Escherichia coli d'origine bovine, productrices de la toxine cytotoxique nécrosante de type 1 (CNF 1).
Pohl, P.; Daube, Georges ULg; Mainil, Jacques ULg et al

in Annales de Recherches Vétérinaires = Annals of Veterinary Research (1992), 23(1), 83-91

Virulence factors and phenotypes of 61 strains CNF1+ were investigated. Eighty-nine percent of the strains produced an aerobactin and were resistant to the bactericidal activity of sheep serum, both of ... [more ▼]

Virulence factors and phenotypes of 61 strains CNF1+ were investigated. Eighty-nine percent of the strains produced an aerobactin and were resistant to the bactericidal activity of sheep serum, both of which are properties of septicemic strains of E coli. None of the strains reacted either with DNA probes corresponding to the enterotoxins STaP, STb, LT-I and LT-IIa, or to the verotoxins VT-I and VT-II. None produced the adhesins K99, Att25 (FY or F17) and Att111. The great majority (93.4%) of the CNF1+E coli possessed both properties. These properties allow CNF1+ to be distinguished from CNF-E coli. [less ▲]

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See detailFacteurs de virulence et propriétés spécifiques des souches invasives d'Escherichia coli : I) les adhésines et facteurs de colonisation
Mainil, Jacques ULg

in Annales de Médecine Vétérinaire (2003), 147(2, APR-MAY), 105-126

Escherichia coli bacterial species is subdivided into several strains that are pathogenic for man and animals, on the basis of their specific properties and factors which are responsible for their ... [more ▼]

Escherichia coli bacterial species is subdivided into several strains that are pathogenic for man and animals, on the basis of their specific properties and factors which are responsible for their pathogenic characters. The pathogenic strains are classically subdivided into strains with intestinal tropism (enterotoxigenic, enteropathogenic, enterohaemmorrhagic, verotoxigenic and enteroinvasive) and with extraintestinal tropism (uropathogenic and invasive). Invasive strains cause septicaemia and/or bacteraemia with localisations in different internal organs (systemic infections): If specific virulence properties and factors of strains with intestinal tropism are quite well known and described, those of strains with extraintestinal tropism are much less characterised, especially in animals. The purpose of this serie of review articles is to present the current knowledge on specific properties and factors of extraintestinal strains: adhesins and colonisation factors, transmucosal transfer and survival in blood and internal organs, toxicity. The fourth manuscript will deal with the invasive strains themselves, focusing on the necrotoxigenic strains. This first manuscript presents the current knowledge on the receptors, roles in pathogenesis, structures, genetic determinism and identification methods of fimbrial adhesins of P (Pap, Prs), S (Sfa, F1C, Sfr) and F17 (Vir, Att25, FY, 20K, G, Att111) families and of afimbrial adhesins of Afa family (Afa, Nfa, F1845, Bma, Dr...). [less ▲]

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See detailFacteurs de virulence et propriétés spécifiques des souches invasives d'Escherichia coli : II) Franchissement des muqueuses et propriétés invasives
Mainil, Jacques ULg

in Annales de Médecine Vétérinaire (2003), 147(3, JUN-JUL), 159-171

Escherichia coli bacterial species is subdivided into several strains that are pathogenic for man and animals, on the basis of their specific properties and factors which are responsible for their ... [more ▼]

Escherichia coli bacterial species is subdivided into several strains that are pathogenic for man and animals, on the basis of their specific properties and factors which are responsible for their pathogenic characters. The pathogenic strains are classically subdivided into strains with intestinal tropism (enterotoxigenic, enteropathogenic, entero-haemorrhagic, verotoxigenic and enteroinvasive) and with extraintestinal tropism (uropathogenic and invasive). Invasive strains cause septicaemia and/or bacteraemia with localisations in different internal organs (systemic infections). If specific virulence properties and factors of strains with intestinal tropism are quite well known and described, those of strains with extraintestinal tropism are much less characterised, especially in animals. The purpose of this serie of review articles is to present the current knowledge on specific properties and factors of extraintestinal strains : adhesins and colonisation factors, transmucosal transfer and survival in blood and internal organs, toxicity. The fourth manuscript will deal with the invasive strains themselves, focusing on the necrotoxigenic strains. This second manuscript presents the current knowledge on the transmucosal transfer, resistance to the bactericidal activity of the complement, resistance to phagocytosis and production of colicins, that were, for several years, considered as an important specific property of invasive strains of E coli. [less ▲]

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See detailFacteurs de virulence et propriétés spécifiques des souches invasives d'Escherichia coli : III) Production de toxines
Van Bost, S.; Mainil, Jacques ULg

in Annales de Médecine Vétérinaire (2003), 147(5, OCT-NOV), 327-342

Escherichia coli bacterial species is subdivided into several strains that are pathogenic for man and animals, on the basis of their specific properties and factors which are responsible for their ... [more ▼]

Escherichia coli bacterial species is subdivided into several strains that are pathogenic for man and animals, on the basis of their specific properties and factors which are responsible for their pathogenic characters. The pathogenic strains are classically subdivided into strains with intestinal tropism (enterotoxigenic, enteropathogenic, enterohaemmorrhagic, verotoxigenic and enteroinvasive) and with extraintestinal tropism (uropathogenic and invasive). Invasive strains cause septicaemia and/or bacteraemia with localisations in different internal organs (systemic infections). If specific virulence properties and factors of strains with intestinal tropism are quite well known and described, those of strains with extraintestinal tropism are much less characterised, especially in animals. The purpose of this serie of review articles is to present the current knowledge on specific properties and factors of extraintestinal strains: adhesins and colonisation factors, transmucosal transfer and survival in blood and internal organs, toxicity. The fourth manuscript will deal with the invasive strains themselves, focusing on the necrotoxigenic strains. This third manuscript presents the current knowledge on toxins produced by invasive strains of E. coli: endotoxins, cytotoxic necrotising factors, cytolethal distending toxins and haemolytic toxins. [less ▲]

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See detailFacteurs de virulence et propriétés spécifiques des souches invasives d’Escherichia coli : IV) Les souches nécrotoxinogènes
Mainil, Jacques ULg; Van Bost, S.

in Annales de Médecine Vétérinaire (2004), 148(3), 121-132

Escherichia coli bacterial species is subdivided into several pathogen strains in man and animals, on the basis of their specific properties and factors which are responsible for their virulence. The ... [more ▼]

Escherichia coli bacterial species is subdivided into several pathogen strains in man and animals, on the basis of their specific properties and factors which are responsible for their virulence. The pathogenic strains are classically subdivided into strains with intestinal tropism (enterotoxigenic, enteropathogenic, enterohaemmorrhagic, verotoxigenic and enteroinvasive) and with extraintestinal tropism (uropathogenic and invasive). Invasive strains cause septicaemia and/or bacteraemia with localisations in different internal organs (systemic infections). If specific virulence properties and factors of strains with intestinal tropism are quite well known and described, those of strains with extraintestinal tropism are much less characterised, especially in animals. The purpose of this series of review articles is to present the current knowledge on specific properties and factors of extraintestinal strains. The first three manuscripts reviewed the characteristics of adhesins and colonisation factors, transmucosal transfer, survival in blood and internal organs, and toxicity. After the presentation of the animal and human invasive E. coli, this fourth manuscript reviews the current knowledge on the necrotoxigenic strains and finishes with a discussion on the meaning of the bacterial virulence in general. [less ▲]

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See detailFacteurs écologiques de production du frêne en Condroz et productivité des stations potentielles
Claessens, Hugues ULg; Thibaut, André; Rondeux, Jacques ULg

in Cahiers Forestiers de Gembloux (1993), 11

The aim of the present study is to correlate site variables with measured site index restricted to pure even-aged or nearly even-aged stands of ash. The site evaluation has been made through 81 ... [more ▼]

The aim of the present study is to correlate site variables with measured site index restricted to pure even-aged or nearly even-aged stands of ash. The site evaluation has been made through 81 experimental plots distributed throughout the Condroz under a wide range of ecological conditions and types of soils. Site index (top height at 50 years) was measured on each plot using tree height-age relationship according to an appropriate methodology [THIBAUT and al., 1992]. In order to appreciate the relative importance of all the observed or measured site factors, plots were grouped in three major groups related to site conditions and defined as follows : alluvial and colluvial sites, flats and slopes either on deep muddy soils or on stony soils. Topographic position, soil depth and soil drainage conditions had the highest correlation with measured site index. These variables and the three site groups have been successfully used as independent variables in a regression model that is an interesting tool for evaluating productive potential of a site for ash even devoid of trees. [less ▲]

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See detailLes facteurs explicatifs de la sensibilité à l’anxiété chez l’enfant: revue de la litterature
Stassart, Céline ULg; Etienne, Anne-Marie ULg

in Revue Francophone de Clinique Comportementale et Cognitive (2010), 15(2), 1-12

Anxiety sensitivity (AS) is the fear of anxiety-related sensations, arising from beliefs that the sensations have harmful physical, psychological or social consequences. AS is considered as a risk factor ... [more ▼]

Anxiety sensitivity (AS) is the fear of anxiety-related sensations, arising from beliefs that the sensations have harmful physical, psychological or social consequences. AS is considered as a risk factor for the development and preservation of anxiety disorders. It is thus important to understand the development of AS to have a preventive act of anxiety disorders. This article is a synthesis of studies that have investigated the etiology of child AS, to extract explanatory models. Some factors are playing a role in the development of AS: biologic, interpersonal and environmental factors. Results indicated that studies have investigated those factors alone, and those factors accounted a part of incremental variance in child AS. To improve the understanding of development of AS, a integrate model with some factors – sex of children, sex of parents, sources of learning, emotional and relational state of parents- may be investigate in future studies. [less ▲]

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See detailFacteurs explicatifs et dynamiques des procès de migration féminine et d’intégration en Belgique (FEMIGRIN)
Timmerman, Christiane; Martiniello, Marco ULg; Rea, Andrea et al

Report (2010)

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See detailFacteurs favorisant les pénétrations laryngées en gériatrie
ALLEPAERTS, Sophie ULg; DELCOURT, Sandrine; WISLEZ, Stéphanie et al

in Gériatrie et Psychologie Neuropsychiatrie du Vieillissement (2011), 9(1), 45-50

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See detailFacteurs genetiques de l'alcoolo-dependance Revue des principales donnees de la litterature.
Pinto, Emmanuel ULg; Ansseau, Marc ULg

in Encéphale (L') (2009), 35(5), 461-9

INTRODUCTION: Alcohol dependence is a complex and multifactorial disease resulting both from neurobiological mechanisms and environmental factors. It is frequently associated with comorbid psychiatric ... [more ▼]

INTRODUCTION: Alcohol dependence is a complex and multifactorial disease resulting both from neurobiological mechanisms and environmental factors. It is frequently associated with comorbid psychiatric disorders or with specific personality or behavioral features. Although action can be taken on the environment in order to decrease the risk of the illness, current methods used to prevent or to treat this pathology show moderate efficacy: problematic consumption of ethanol in the general population as well as relapse rates under treatment in dependent patients remain indeed very high. LITERATURE FINDINGS: It is therefore of major importance to broaden our knowledge of alcohol dependence and its comorbidities so as to improve both their prevention and treatment. In this perspective, recent progress in the field of neurosciences may contribute to achieve this goal. Precisely, genetics is a promising way benefiting from many advances in genetic epidemiology, cellular and molecular biology, neuroimaging and pharmacology. In parallel with a better understanding of the neurobiology of addictions and associated behaviors, these techniques led to the identification of brain mechanisms in which a genetic variation may influence the individual vulnerability towards alcohol dependence. Moreover, there is growing evidence that alcoholism results from the interaction of genetic and environmental factors influencing both its expression and its course. Given the fact that alcohol-dependence seems highly heritable (50 to 60% of the variance in both men and women), this review assesses the role of some of the genomic regions linked with the disease, as well as the principal variants of candidate genes identified as specifically involved in the predisposition. Polymorphisms of genes influencing alcohol metabolism, GABAergic, dopaminergic and serotonergic neurotransmission seem, indeed, at stake in the development of alcohol-dependence and its related features such as personality, behavior, impulse control or craving. In the future, a better characterization of the links between genotypes and phenotypes will probably increase our ability to treat alcoholic patients. [less ▲]

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