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See detailPopulation trapping in the one-photon mazer
Bastin, Thierry ULg; Solano, E.

in Optics Communications (2003), 217

We study the population trapping phenomenon for the one-photon mazer. With this intent, the mazer theory is written using the dressed-state coordinate formalism, simplifying the expressions for the atomic ... [more ▼]

We study the population trapping phenomenon for the one-photon mazer. With this intent, the mazer theory is written using the dressed-state coordinate formalism, simplifying the expressions for the atomic populations, the cavity photon statistics, and the reflection and transmission probabilities. Under the population trapping condition, evidence for new properties of the atomic scattering is given. Experimental issues and possible applications are discussed. (C) 2003 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailPopulation-level retrospective study of neurologically expressed disorders in ruminants before the onset of bovine spongiform encephalopathy (BSE) in Belgium, a BSE risk III country.
Saegerman, Claude ULg; Berkvens, D.; Claes, L. et al

in Journal of Clinical Microbiology (2005), 43(2), 862-9

A retrospective epidemiological study (n = 7,875) of neurologically expressed disorders (NED) in ruminants before the onset of the bovine spongiform encephalopathy epidemic (years studied, 1980 to 1997 ... [more ▼]

A retrospective epidemiological study (n = 7,875) of neurologically expressed disorders (NED) in ruminants before the onset of the bovine spongiform encephalopathy epidemic (years studied, 1980 to 1997) was carried out in Belgium. The archives of all veterinary laboratories and rabies and transmissible spongiform encephalopathy (TSE) epidemiosurveillance networks were consulted. For all species, a significantly higher number of NED with virological causes (rabies) was reported south of the Sambre-Meuse Valley. During the period 1992 to 1997, for which the data were complete, (i) the predicted annual incidence of NED varied significantly as a function of species and area (higher numbers in areas where rabies was present) but was always above 100 cases per million, and (ii) the mean incidence of suspected TSE cases and, among them, those investigated by histopathological examination varied significantly as a function of species and area. The positive predictive value of a presumptive clinical diagnosis of NED ranged from 0.13 (game) to 0.63 (sheep). Knowledge of the positive predictive value permits the definition of a reference point before certain actions (e.g., awareness and training campaigns) are undertaken. It also shows the usefulness of a systematic necropsy or complementary laboratory tests to establish an etiological diagnosis. TSE analysis of a small, targeted historical sampling (n = 48) permitted the confirmation of one case and uncovered another case of scrapie. The results of the present study help to develop and maintain the quality of the worldwide clinical epidemiological networks for TSE, especially in countries that in the past imported live animals, animal products, and feedstuffs from countries with TSE cases. [less ▲]

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See detailLes populations d'origine immigrée face au droit en Belgique
Martiniello, Marco ULg; Foblets, Marie-Claire

Book published by Academia Press (2004)

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See detailLes populations de grands mammifères et d'autruches du Parc National de Zakouma au Tchad : statuts et tendances évolutives
Dejace, Philippe; Gauthier, Laure; Bouché, Philippe ULg

in Revue d'Ecologie (2000), 55

Zakouma National Park is situated in the south-east of Chad Republic and covers more than 3 000 km2. Rehabilitated in 1989, it is certainly one of the best-preserved wildlife sanctuaries in Sahelian ... [more ▼]

Zakouma National Park is situated in the south-east of Chad Republic and covers more than 3 000 km2. Rehabilitated in 1989, it is certainly one of the best-preserved wildlife sanctuaries in Sahelian Africa. Aerial census shows that most of its original fauna is still present, making the Park an exception in the region despite the recent troubled history of this country. Total population estimates of elephants, buffaloes and topis are given and distribution maps are presented for eleven species. Results are compared with two previous estimates. Except for the ostrich and perhaps the warthog, probably in regression, the populations of two species are stable (hartebeest and giraffe) while the others are clearly increasing (buffalo, topi, elephant and roan antelope). Those encouraging results are the consequence of the remoteness of the park, wich is far from any big town, and also overflooded and isolated during the wet season. Those facts contribute to maintain the human pressure at a sustainable level. [less ▲]

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See detailLes populations de rats noirs insulaires de l'ouest de l'Europe. Essai préliminaire de caractérisatin génétique (caryotype et ADN mitochondrial)
Libois, Roland ULg; Torrico, Jorge; Ramalhinho, Maria Graça et al

in Vie et milieu (1996), 46(3-4), 213-218

The colonisation of Europe by the black rat (Rattus rattus) dates back only to the Roman times. This rodent is now widespread all over the continent as well as on many islands where it was introduced by ... [more ▼]

The colonisation of Europe by the black rat (Rattus rattus) dates back only to the Roman times. This rodent is now widespread all over the continent as well as on many islands where it was introduced by man. In some instances, insular populations are morphologically differentiated by their great size. In order to study the possible origin of these insular populations, rats were caught on many Mediterranean (Sicily, Sardinia, Lavezzi, Corsica, Elba, Porquerolles) and Atlantic islands (Ré, Oléron, Azores) and compared to animals from continental Europe (Spain), and Africa (Tunisia, Benin). Their karoytype was determined and their mtDNA restriction patterns studied using the HAEIII and RSA I endonucleases and a polyacrylamide gel electrophoresis. These patterns appear very similar to each other though one of them is specific to the African animals, probably indicating that Europe and Africa were colonised by different strains. [less ▲]

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See detailLes populations insulaires face au changement climatique : des migrations à anticiper
Cournil, Christel; Gemenne, François ULg

in VertigO : la Revue Electronique en Sciences de l'Environnement (2010), 10(3),

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See detailPopulations of aphid natural enemies in agroecosystems, with special emphasis on the Multicoloured Asian Ladybird Harmonia axyridis Pallas (Coleoptera: Coccinellidae)
Vandereycken, Axel ULg

Doctoral thesis (2014)

The international trade of goods and food can lead to the introduction of alien species in the importing countries. Even if in the most cases there is no negative impact induced by alien species, in some ... [more ▼]

The international trade of goods and food can lead to the introduction of alien species in the importing countries. Even if in the most cases there is no negative impact induced by alien species, in some cases the new imported species can spread out of control. These species can cause economical and ecological damages. The Multicoloured Asian ladybird Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) is one of these species which was intentionally introduced for biological control and has spread from its native range in Central and Eastern Asia to large parts of North and South America, Europe and Africa. The decline of native species is linked to the spread and the aggressive behaviour of H. axyridis. The objective of this thesis is the evaluation of aphid's predator population densities and predator diversities, with a special focus on H. axyridis in agroecosystems in Wallonia, in the South of Belgium. First, field crops preferences of H. axyridis were determined. Later aphid's predator population changes during time were evaluated. Finally H. axyridis population changes between two crop farming were evaluated. Our main findings were as follows. Results, based on insects collected since 2001, highlighted that the first collected H. axyridis was in 2002 and the population of H. axyridis is increasing until 2008. In the same time population of Adalia bipunctata, Propylea quatuordecimpunctata and Psyllobora vigintiduopunctata, three native species, are decreasing. Samplings in agroecosystems highlighted that aphid's predator community is composed of few dominant species: three coccinellids Coccinella septempunctata, P. quatuordecimpunctata and H. axyridis, one syrphid Episyrphus balteatus and one chrysopid Chrysoperla carnea. We have shown that H. axyridis do not invade all Wallonia crops at the same rate because corn and broad bean are more invaded that wheat and potato at both larval and adult stages. Moreover in corn, H. axyridis populations has strongly increased from 2009 to 2011. Finally, organic farming do not enhance abundance of H. axyridis but lead to increase the total abundance of aphid natural enemies. [less ▲]

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See detailLes populations riveraines du Ranch de Nazinga : anthropologie politique, aménagement des terroirs et zones villageoises de chasse
Vermeulen, Cédric ULg; Michaux, J. F.

in Delvingt, W.; Vermeulen, Cédric (Eds.) Nazinga (2007)

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See detailLes populations riveraines du Ranch de Nazinga : anthropologie politique, aménagement des terroirs et zones villageoises de chasse
Vermeulen, Cédric ULg; Michaux, J.-F.

in Vermeulen, Cédric; Delvingt, W. (Eds.) Nazinga (2007)

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See detailLes populations rurales : évolutions et perceptions en Wallonie
Mougenot, Catherine ULg

in Espace, Populations, Sociétés (1986), III

Les connaissances sur les populations rurales sont elles-mêmes produites par les représentations qu’on se fait de ce monde rural. Elles mobilisent des catégories de description et d’analyse qui sont ... [more ▼]

Les connaissances sur les populations rurales sont elles-mêmes produites par les représentations qu’on se fait de ce monde rural. Elles mobilisent des catégories de description et d’analyse qui sont influencées par le contexte du moment. Autrement dit, elles sont le reflet de préoccupations sociales qui définissent les questions prioritaires ou pertinentes à leur sujet. L’analyse porte plus spécifiquement sur la situation de l’après-guerre en Région wallonne (Belgique). [less ▲]

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See detailPopulations vulnérables en temps de conflit armé
Pierre, Alexia ULg

in Guedah, Mohamed (Ed.) Délinquance et changements sociaux – dialogue nord/sud (2009)

De nombreux textes conventionnels et internationaux prévoient des dispositions de protection des populations non combattantes en temps de conflit armé. Parmi ces populations civiles, certains groupes sont ... [more ▼]

De nombreux textes conventionnels et internationaux prévoient des dispositions de protection des populations non combattantes en temps de conflit armé. Parmi ces populations civiles, certains groupes sont considérés comme plus vulnérables, dont les femmes et les enfants, pour lesquels des protections spéciales sont prévues. Malgré ces dispositions particulières, ces populations continuent de subir des exactions en temps de guerre, par exemple le viol systématique et massif, ou l'utilisation d'enfants dans les combats. [less ▲]

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See detailPopulism and producerism in Europe and United States
Jamin, Jérôme ULg

Conference (2003)

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See detailPopulisme en Europe
Jamin, Jérôme ULg

Conference given outside the academic context (2008)

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See detailPopulisme et stigmatisation d’une lutte ouvrière : l’affaire "Clabecq"
Geuens, Geoffrey ULg

in Hermès (2005), 42 ("Peuple, populaire, populisme")

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See detailPopulisme, dépolitisation, délégitimation
Delruelle, Edouard ULg

Conference given outside the academic context (2010)

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See detailPorc et reduction des rejets azotes.
Leterme, Pascal; Thewis, André ULg

in Agricontact (1994), (259), 3-4

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See detailLe porc sur parcours : le retour aux origines.
Bindelle, Jérôme ULg

Article for general public (2003)

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See detailLes porcheries : réservoirs des culicoïdes (Diptera: Ceratopogonidae), vecteurs des virus de la Maladie de la Langue bleue et de Schmallenberg ?
Zimmer, Jean-Yves ULg; Saegerman, Claude; Martinelle, Ludovic et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (in press)

Detailed reference viewed: 27 (8 ULg)