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See detailEtude pilote relative à l'évaluation du risque sismique pour la ville de Liège
Plumier, André ULg; Degée, Hervé ULg

in Actes des journées APS-AFPS 2008 (2009)

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See detailEtude pluridisciplinaire de l'implication bactérienne du phénomène de blanchissement des coraux Scléractiniaires (Indo-Pacifique)
Ladrière, Ophélie ULg

Doctoral thesis (2012)

Given the increasing number of coral diseases linked to the growing impact of global warming and human activities, the present research focused on the phenomenon of coral bleaching. The Scleractinian ... [more ▼]

Given the increasing number of coral diseases linked to the growing impact of global warming and human activities, the present research focused on the phenomenon of coral bleaching. The Scleractinian Cnidaria are the essential building blocks of the coral reef ecosystem, whose ecological, economic and societal interests are demonstrated. The symptom of bleaching has multiple and complex causes that are still unclear. It corresponds to the rupture of the mutualistic symbiosis between the coral and microalgae, called zooxanthellae, and can causes death of many corals. An assumption underlying this phenomenon suggests that corals are bleaching by the action of pathogenic bacteria, penetrating inside the coral tissues. However, this hypothesis seems quite controversial and the present work attempts to elucidate a set of issues surrounding this controversy. To do this, a multidisciplinary approach combining ecology (general and microbial) and molecular biology has been established through field and experimental studies. Using electron microscopy, morphological criteria were established to characterize the status of coral bleaching. Furthermore, this technique was also used to identify different types of bacteria within coral tissues. Their presence and their role within the coral holobiont were discussed. Several molecular biology techniques (DGGE, sequencing) have provided evidences on the non-specificity of bacterial communities associated with corals species, sampling sites and different status of bleaching. This non-specificity shows that the functions performed by bacteria in the coral holobiont could be the result of opportunistic bacteria from various taxonomic groups. The presence of Cyanobacteria in some corals, detected by microscopy and confirmed by molecular techniques, raises the question about their role within the holobiont and the alternative pathway that they offer for the symbiotic host compared with zooxanthellae. The issues of potential competition between these different symbionts or the benefit of this symbiotic diversity, in case of bleaching event, remain open. Transcriptomic genetics was used to study the response of coral facing a bacterial stress in different experimental conditions of temperature determining the expression of bacterial virulence. Studying the expression profile of genes involved in immunity of the coral allowed to understand the sequence of reactions and changes in resource allocation in response to different stages of bacterial infection. On this experiment, the first antimicrobial peptide of Scleractinia, the damicornin, has been identified and characterized. All these results suggest that the context of changes in environmental parameters is more important than the presence of pathogens itself. The bacteria would then act as an aggravating factor in a situation where the coral, already weakened and stressed, cannot defend itself adequately. Finally, the observation of an increase in cnidocytes in a coral species that has undergone bleaching, suggests that some coral species are able to shift to a more heterotrophic nutritional regime adapting to the lack of inputs caused by the significant loss of zooxanthellae. This would favor the resilience of coral. [less ▲]

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See detailEtude préliminaire d'impact d'une exploitation de carrière - Zoning industriel de Tertre
Dassargues, Alain ULg; Biver, Pierre; Demanet, Donat et al

Report (1988)

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See detailEtude préliminaire d'un pont flottant de 100 m.de longueur
Marchal, Jean ULg; Rodriguez, S.

Report (1982)

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See detailEtude préliminaire d'une ligne fluviale de transport de conteneurs et du matériel de transport adapté entre Liège et la Mer du Nord
Marchal, Jean ULg; Rodriguez, S.; Gulan, C.

in Proceeding 26th AIPCN Congress, section 1-3 (1985)

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See detailEtude préliminaire de l’efficacité des ondes de choc dans le traitement des épicondylites
Forthomme, Bénédicte ULg; Crielaard, Jean-Michel ULg; Croisier, Jean-Louis ULg

in Abstract Book du Symposium « Actualités en électrothérapie » du CKULg (2006)

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See detailEtude préliminaire de la fidélité intercotateurs de l'échelle psychopathologique AMDP
Von Frenckell, R.; Berner, P.; Bobon, D. P. et al

in Compte rendu du Congrès de psychiatrie et de neurologie de langue française (1978, July)

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See detailEtude préliminaire des effets de la fragmentation des forêts sur la similarité des habitats et leurs richesses en espèces de rongeurs (Masako, R.D. Congo).
Iyongo, W M; Visser, M; Verheyen, E et al

in Annales des Instituts Supérieurs d’Etudes Agronomiques de Bengamisa (2009), 4

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See detailEtude préliminaire des effets de lisière sur quatre espèces de rongeurs dans la Réserve de Masako (Kisangani, R.D. Congo).
Iyongo, W M; Visser, M; Verheyen, E et al

in Annales des Instituts Supérieurs d’Etudes Agronomiques de Bengamisa (2009), 4

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See detailEtude préliminaire des taxocénoses de pelouses calaminaires
Dufrêne, Marc ULg

in Bulletin et Annales de la Société Royale Belge d’Entomologie = Bulletin en Annalen van de Koninklijke Belgische Vereniging voor Entomologie (1990), 126

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See detailEtude préliminaire du comportement d'hybridation de Barbus barbus (L.) et de Barbus meridionalis (Risso) en aquarium.
Jeandarme, J.; Poncin, Pascal ULg; Berrebi, P.

in Cahiers d'Ethologie Appliquée (1992), 11(4), 519-528

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