Does turbulence affect the habitat choice of Atlantic salmon parr?
; Ovidio, Michaël ; et al
Conference (2007, June)
Habitat preferences of Atlantic salmon parr are commonly described using mean flow velocity, water depth, and substrate as habitat variables, and a variety of habitat models have been developed using ... [more ▼]
Habitat preferences of Atlantic salmon parr are commonly described using mean flow velocity, water depth, and substrate as habitat variables, and a variety of habitat models have been developed using these variables to predict habitat quality. However, Atlantic salmon parr live in highly turbulent streams and rivers, in which intense fluctuations of flow velocity occur. Habitat preferences that consider the high variability of flow velocity have not been studied, and this although it has been shown in laboratory experiments that turbulence may affect the behavior and energetics of fish. Consequently, we studied the use of turbulent flow by Atlantic salmon parr in Patapédia River, Québec, Canada using radio-telemetry. We analyzed summer habitat preferences of individual parr in relation to several dynamic hydraulic variables such as standard deviation of flow velocity, turbulent kinetic energy, Froude number, and shear stress, and compared them with the habitat availability within the river reach. Our results revealed that in a natural flow environment, parr display a high individual variability in habitat preferences in relation to flow turbulence. Such heterogeneous habitat preferences suggest that individuals are not constrained to single habitat types and exhibit flexible habitat use. Furthermore, no differences were observed in habitat preferences between the four daily periods (dawn, day, dusk, and night) within individual parr. [less ▲]Detailed reference viewed: 54 (3 ULg)
Does vascular endothelial growth factor improve ovarian tissue recovery after cryopreservation?
HENRY, Laurie ; Fransolet, Maïté ; LABIED, Soraya et al
Poster (2012, November 30)Detailed reference viewed: 6 (0 ULg)
Does vascular endothelial growth factor improve ovarian tissue recovery after cryopreservation?
Henry, Laurie ; Fransolet, Maïté ; Labied, Soraya et al
in Giornale italiano di obstetricia e gynecologia (2012)Detailed reference viewed: 51 (11 ULg)
Does victim-offender mediation promote restoration in victims of crime? A reaction to the paper presented by Ms Daniela Bolivar.
Scientific conference (2011, June 08)Detailed reference viewed: 22 (1 ULg)
Does water facilitate gene flow in spore-producing plants? Insights from the fine-scale genetic structure of the aquatic moss Rhynchostegium riparioides.
; ; Vanderpoorten, Alain
in Aquatic Botany (2013), 108Detailed reference viewed: 24 (3 ULg)
Does yellow eel prefer old pool and weir or new vertical slot fish pass during their upstream migration?
Nzau Matondo, Billy ; Dierckx, Arnaud ; Benitez, Jean-Philippe et al
Conference (2015, June)
The hydroelectric dam of Lixhe in the River Meuse, 323km upstream from the North Sea at the entry of Belgium near the frontier with the Netherlands is equipped with two basin fish-passes: – the old pool ... [more ▼]
The hydroelectric dam of Lixhe in the River Meuse, 323km upstream from the North Sea at the entry of Belgium near the frontier with the Netherlands is equipped with two basin fish-passes: – the old pool-and-weir configuration (OFP) operates at low discharge (0.13m3/s) and – the new vertical-slot configuration (NFP) operating at high discharge (1m3/s) with attraction flow (1.5m3/s). However, the utilization rate of these fish-passes by the incoming yellow eels remains unknown, because the trap of NFP is not adapted to retain anguillids and small species. Yet, such knowledge is crucial to improve the inland colonization of the species and to increase our understanding of fish-pass utilization given its particular swimming mode. In season 2013, eels caught two times a week using a cone-trap pool in the OFP and net traps in the NFP, were tagged and released the same day 0.3km downstream (n = 396eels). The utilization of OFP and NFP was studied using automatic RFID transponder detection antennas placed in upstream basins of the fish-passes, during years 2013 and 2014. Results revealed that the OFP was the preferred migration route of eels (eel numbers, OFP:NFP, 2013= 88:51 and 2014= 41:16, χ²-test, p<0.0001), which was also used earlier in season. Eels displayed fidelity to their catch fish-passes (>70% of the detected eels, annually). Detection rate was high in the year of eel tagging (2013: 35.1%) before decreasing in the following year (2014: 14.4%). Eels used these fish-passes the night from 22:00 to 04:00, at 14-26°C, river flow <200m³/s and whenever waxing and waning phases of moonlight. Our results provide insight into the utilization of fish-passes by migrating eels. The study suggests further reflection before removing the old fish-pass in large rivers and to think about the eel attractiveness and comfort when the construction of a new fish pass is planned. [less ▲]Detailed reference viewed: 80 (17 ULg)
Does Z-VAD-FMK treatment could decrease follicular loss after autografting of cryopreserved ovarian tissue?
Fransolet, Maïté ; HENRY, Laurie ; LABIED, Soraya et al
Poster (2014, September 30)Detailed reference viewed: 10 (0 ULg)
Doing better in more complex patients: leading the way for QUIP.
; ; et al
in European journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery (2016), 49(2), 397-8Detailed reference viewed: 28 (8 ULg)
Doing research and engaging oneself: Modes of normative engagement in public participation in science and technology
Van Oudheusden, Michiel ;
Conference (2009, May 25)Detailed reference viewed: 4 (0 ULg)
Doit-on encore recommander le vaccin BCG?
Collette, Georges ; Bourhaba, Maryam ; Moutschen, Michel
in Revue Médicale de Liège (2006), 61(5-6, May-Jun), 430-2
The BCG vaccine has demonstrated its efficacy to protect young children from severe extrapulmonary forms of tuberculosis. Nevertheless, the immunity induced by the vaccine disappears in adults and cannot ... [more ▼]
The BCG vaccine has demonstrated its efficacy to protect young children from severe extrapulmonary forms of tuberculosis. Nevertheless, the immunity induced by the vaccine disappears in adults and cannot be boosted by readministration of BCG. Adverse effects of BCG are rare, but potentially dangerous (i.e. disseminated vaccinal infections) and they justify the fact that BCG should not be administered anymore in Western European countries where the incidence of pediatric tuberculous meningitis is very low. The vaccine is still recommanded for children living in countries with high tuberculosis prevalence and for resident children leaving Belgium for these countries. [less ▲]Detailed reference viewed: 63 (1 ULg)
Doit-on parler d'influence ou de détermination du style d'apprentissage d'un stagiaire sur son profil d'enseignement ?
Conference given outside the academic context (1997)Detailed reference viewed: 7 (1 ULg)
Dolichantoside, Main Alkaloid from Stem Bark of Strychnos Tricalysioides
; Angenot, Luc
in Planta Medica (1984), 50(5), 457-8
The bark of Strychnos tricalysioides from Cameroon has been studied. The main alkaloid (present in a minute amount) was identified to dolichantoside (TLC, UV, IR and CD) and compared to a reference ... [more ▼]
The bark of Strychnos tricalysioides from Cameroon has been studied. The main alkaloid (present in a minute amount) was identified to dolichantoside (TLC, UV, IR and CD) and compared to a reference compound previously isolated in our laboratory from Strychnos gossweileri root bark. [less ▲]Detailed reference viewed: 36 (2 ULg)
Le Dolichantoside, un alcaloïde nouveau du Strychnos gossweileri
; Angenot, Luc
in Planta Medica (1978), 34
This paper reports about the isolation and structure determination of a new indole glucoalkaloid extracted from the roots of Strychnos gossweileri collected in Democratic Republic of Congo (Zaïre)Detailed reference viewed: 17 (1 ULg)
Les doliolides de la mer Rouge
in Rapports et Procès Verbaux des Réunions - Commission Internationale pour l'Exploration Scientifique de la Mer Mediterranée (1983), 28(9), 185-186
The Doliolid fauna of the Red Sea is rather poor as five species belonging to three genera have been identified. Doliolina indicum is the commoner and sole characteristic form. The size of the ripe ... [more ▼]
The Doliolid fauna of the Red Sea is rather poor as five species belonging to three genera have been identified. Doliolina indicum is the commoner and sole characteristic form. The size of the ripe gonozooïds is lower than in temperate seas. [less ▲]Detailed reference viewed: 2 (0 ULg)
'Dolomite lime effects on acid forest soils: traditional and molecular approaches
Conference (2000, November)
The study of biogeochemical processes in soil has long been restricted by the techniques available for investigating the micro-organisms concerned. In particular, isolated nitrifying bacteria are not ... [more ▼]
The study of biogeochemical processes in soil has long been restricted by the techniques available for investigating the micro-organisms concerned. In particular, isolated nitrifying bacteria are not active in culture media below pH 5.5-6.0, and it is not clear to what extent these strains, if at all, are active in the acid soils of temperate forests. Since DNA/RNA based microbiological techniques do not require isolation of bacterial strains, they provide a new, powerful approach to gain insight into the nitrification process. We therefore combined the use of a large scale field experiment and laboratory soil incubations with molecular analysis of the nitrifying bacterial community to investigate the effect of dolomite lime on the nitrification process in the soil of the Belgian Ardenne. In this area, soils are naturally poor in magnesium and liming at moderate doses has been suggested to alleviate soil acidification and nutritional deficiencies. However, possible side effects needed to be evaluated, in particular on the nitrification process. As nitrification may be linked to soil acidification, cation leaching, aluminium mobilisation and N2O emission, increased knowledge is essential when evaluating effects of global environmental change and management strategies on forest ecosystems. The effects of dolomite lime (3-5 T/ha) were investigated at the watershed (80 ha, mainly Picea abies), plot (Quercus petraea and Picea abies stands) and laboratory level. Runoff chemistry, soil solution, net nitrate production in the laboratory and the community structure of ammonium oxidising bacteria (by PCR amplification of 16S-RNA genes, Denaturing Gradient Gel Electrophoresis - DGGE, sequence analysis and hybridisation) were analysed. In the watersheds, consequences on runoff water chemistry were minor. However, in the plot study, soil solution nitrate concentrations were significantly increased through liming in the Quercus plots. Increased net nitrification in the Quercus stand was confirmed by potential net nitrification measurements in the laboratory, whereas soil pH rose in both stands. The impact of liming on potential net nitrification was not related to a shift in the 16S rDNA DGGE community profile of ammonia-oxidising bacteria. The DDGE profile, combined with hybridisation and sequencing of cut out bands revealed a dominance of Nitrosomonas europea-like sequences and a minor presence of Nitrosospira cluster 2-like sequences. These results contrast with several reports suggesting a dominance of Nitrosospira-like organisms among ammonia oxidiser communities in acid soils. Our study reflects the great potential of combining new molecular techniques with conventional methods for improving our knowledge on the ecology of biogeochemical processes. [less ▲]Detailed reference viewed: 34 (0 ULg)
Domain Decomposition Methods for Time-Harmonic Electromagnetic Waves with High Order Whitney Forms
Marsic, Nicolas ; ; et al
in IEEE Transactions on Magnetics (2016), 52(3),
Classically, domain decomposition methods (DDM) for time-harmonic electromagnetic wave propagation problems make use of the standard, low order, Nédélec basis functions. This paper analyzes the ... [more ▼]
Classically, domain decomposition methods (DDM) for time-harmonic electromagnetic wave propagation problems make use of the standard, low order, Nédélec basis functions. This paper analyzes the convergence rate of DDM when higher order finite elements are used for both volume and interface discretizations, in particular when different orders are used in the volume and on the interfaces. [less ▲]Detailed reference viewed: 76 (12 ULg)