Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Peer Reviewed
See detailDeveloppement d'une méthodologie destinée à mesurer les réactions de peur chez le cheval. Application à l'étude de l'influence de différents facteurs.
Vierin, M.; Bouissou, M. F.; Vandenheede, Marc ULg et al

in Compte rendu de la 24ème Journée de la Recherche Equine (1998)

Detailed reference viewed: 143 (4 ULg)
See detailDéveloppement d'une méthodologie pour l’appréciation quantitative des risques appliquée à Salmonella dans la viande de porc en Belgique
Delhalle, Laurent ULg

Doctoral thesis (2009)

Following the European legislation on control of Salmonella and other zoonotic agents, effective measures must be taken to detect and control these agents at all stages of the food chain. Therefore, the ... [more ▼]

Following the European legislation on control of Salmonella and other zoonotic agents, effective measures must be taken to detect and control these agents at all stages of the food chain. Therefore, the Belgian FPS Public Health, Food Chain Safety and Environment has decided to fund a research project involving institutions grouped under a consortium in order to develop a Quantitative Microbial Risk Assessment (QMRA) on human salmonellosis following consumption of minced pork meat. To achieve this goal, preliminary steps were necessary. The first task was a survey on available data at all stages of the production chain from public authorities and food business operators. A database was carried out summarizing the working practices in different companies and the microbiological results of the whole production chain. The aim was to study the sources of contamination of pork meat from the slaughterhouse to the preparation at consumer's home. Thanks to collected data, a QMRA model has been built taking into account the production flow. The objective of the model is to provide options to reduce the risk of human salmonellosis due to consumption of minced pork meat. The scenarios were developed on the international situation and the literature to simulate concrete and realistic opportunities to improve the microbiological quality of pork meat. The potential risk factors of contamination associated with production parameters, technical facilities and methods for cleaning/disinfection were evaluated in the 10 largest Belgian slaughterhouses. The results showed high variability concerning Salmonella contamination among these slaughterhouses, with prevalence ranging from 2.6 to 34.3%. The results of linear and logistic regressions revealed that some working practices such as scalding steam, second flaming after polishing and cleaning/disinfection of the splitter machine several times a day are beneficial to reduce contamination by Salmonella. These data were the basis for modelling the slaughter process of pigs in Belgium. Production stages after the slaughterhouse were also studied. The results of bacteriological analysis of seven cutting plants, four minced meat plants of the four largest retailers in Belgium were collected using data from official and self-monitoring. The Salmonella prevalence in cutting meat varies from 0% to 50%. The prevalence of Salmonella in minced meat at the retail level varies from 0.3% to 4.3%. Salmonella concentrations on the carcasses, the meat and minced meat were estimated from semi-quantitative data and were equal to -3.40 ± 2.04 log CFU/cm ², -2.64 ± 1.76 log CFU/g and -2.35 ± 1.09 log CFU/g, respectively. These data provided the basis to build the model for the cutting, mincing, distribution and storages stages of pork meat chain in Belgium. A QMRA model was then developed on the basis of collected data. After validation, scenarios of risk mitigation have been implemented. The number of human salmonellosis due to consumption of minced pork meat in Belgium was estimated at 15,376 cases per year. The results showed that the risk of human salmonellosis could be reduced significantly with efforts made by food business operators, but also by consumers. Following the model, 25% reduction of carcass prevalence at the slaughterhouse would decrease from 45.7% the number of human salmonellosis cases in Belgium. Consumers should also be aware of good hygiene practices during preparation of the meat in household’s kitchen to avoid cross contamination between foods. Following the model, cross-contamination with raw foods during the preparation of meals generates 14,693 cases of salmonellosis each year and the lack of cooking only 683 cases. The number of cases of human salmonellosis could be reduced by improving the food preparation habits in the kitchen to avoid cross contamination. The results of this research are useful for food business operators and public health officials involved in the production of pork. The QMRA presented in this thesis were used to obtain an overview of the Belgian food chain andalso to make recommendations along the production chain. However, these results must be taken with care because, at present time, the application of QMRA in the meat industry has a recurring problem of lack of data. States and companies should undertake studies and provide a better assessment of the situation of the food chain "from farm to fork". [less ▲]

Detailed reference viewed: 32 (6 ULg)
See detailLe développement d'une multinationale métallurgique liégeoise : la Compagnie Générale des Conduites d'eau (1865-1939)
Destatte, Julien ULg

in Actes du neuvième congrès de l'Association des Cercles francophones d'Histoire et d'Archéologie de Belgique (2012)

The "Compagnie Générale des Conduites d'eau" was an financial and industrial company based in Liège. This article explains briefly how it worked during the periode between its creation in 1865 and 1939.

Detailed reference viewed: 157 (13 ULg)
Peer Reviewed
See detailDéveloppement d'une nouvelle serie d'inactivateurs de protéases à sérine
Schynts, M.; Boggetto, N.; Jiang, K. Y. et al

Poster (1994, May)

Detailed reference viewed: 3 (0 ULg)
See detailDéveloppement d’une politique de Mobilité Urbaine.
Marchal, Jean ULg; Groupe CAPAS, Comité de l’Académie pour les Applications de la Science

Book published by Edition de l’Académie Royale des Sciences, des Lettres et des Beaux Arts de Belgique (1999)

Detailed reference viewed: 19 (2 ULg)
Full Text
See detailDéveloppement d’une procédure automatisée de segmentation de données LIDAR appliquée à la modélisation hydrodynamique
Ernst, Julien ULg

Master of advanced studies dissertation (2007)

Ce travail de DEA s’inscrit dans une stratégie de préparation à de futures recherches doctorales. Dans ce cadre, nous veillerons à soigner particulièrement l’état de l’art afin de le rendre le plus ... [more ▼]

Ce travail de DEA s’inscrit dans une stratégie de préparation à de futures recherches doctorales. Dans ce cadre, nous veillerons à soigner particulièrement l’état de l’art afin de le rendre le plus exhaustif possible dans les différents sujets ayant trait aux données LIDAR et à leur segmentation. Celui-ci pourra, par la suite, nous servir de base de travail intéressante pour nos recherches ultérieures. Par ce travail, nous tenterons d’apporter une autre vision du traitement des modèles topographiques indispensables à toute modélisation hydrodynamique. Dans ce mémoire, outre la section consacrée à l’état de l’art, nous mettrons au point une méthodologie de segmentation des données LIDAR (LIght Detection And Ranging) visant à isoler les zones boisées présentes dans les MNS (Modèle Numérique de Surface) initiaux. Ensuite nous permettrons à l’utilisateur d’interpoler les valeurs d’altitudes sous ces zones isolées, et ainsi reconstruire un modèle topographique pertinent à une simulation hydrodynamique. Pour mener à bien nos objectifs, notre travail bénéficie d’une collaboration innovante et constructive entre les unités de Géomatique (Professeur Roland Billen) et d’Hydraulique Appliquée et Constructions Hydrauliques (Professeur Michel Pirotton) de l’Université de Liège. Chacune met ses compétences et son expertise au service de ce projet pour pouvoir ainsi acquérir une vision globale du problème posé. [less ▲]

Detailed reference viewed: 118 (30 ULg)
Full Text
Peer Reviewed
See detailDéveloppement d’une stratégie d’immunisation passive du poulet de chair vis-à-vis de Salmonella Enteritidis et Typhimurium à l’aide d’anticorps du jaune d’œuf
Marcq, Christopher ULg; Chalghoumi, RAJA ULg; Beckers, Yves ULg et al

in 8èmes JRA : Synthèses et textes (2009)

The present study investigates the potential of oral immunotherapy using hen egg yolk immunoglobulins (IgY) as a strategy to reduce the impact of Salmonella contamination on broilers. In a first step ... [more ▼]

The present study investigates the potential of oral immunotherapy using hen egg yolk immunoglobulins (IgY) as a strategy to reduce the impact of Salmonella contamination on broilers. In a first step, hyperimmune eggs were obtained from laying hens immunized using Salmonella Enteritidis (SE) and Typhimurium (ST) outer membrane proteins in emulsion with Freund adjuvants. This led to the production of high levels of IgY antibodies directed against the two Salmonella serovars in egg yolks. Furthermore, no adverse affects were detected on mortality or laying rate in hens injected with this vaccine. Powders were obtained from these eggs by spray- or freeze-drying the whole yolk. In order to study the effect of these powders on broiler’s growth performances, a challenge trial was conducted. 384 Salmonella spp.-free day-of-hatch chickens received supplemented feed (5 % freeze-dried egg yolk powder) since arrival, and were infected at day four with 106 cfu of SE and ST per animal. We found a significant improvement in growth performances for the groups receiving the yolk-enriched diets. Nevertheless, none of the supplement concentrations allowed to raise the same body weight after 28 days of complementation than in uninfected broilers (p < 0,05). Interestingly, nonimmune egg yolk powder also exhibited a positive effect on performances of broilers experimentally infected with SE and ST. Our results suggest that passive immunization through egg yolk powders could be useful to reduce negative effects of Salmonella infection on broilers growth performances. [less ▲]

Detailed reference viewed: 211 (37 ULg)