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See detailA preliminary study of development of the buccal apparatus in Pomacentridae (Teleostei, Perciformes)
Frederich, Bruno ULg; Parmentier, Eric ULg; Vandewalle, Pierre ULg

in Animal Biology (2006), 56(3), 351-372

This study compares, in five species of Pomacentridae (Chromis viridis, Dascyllus flavicaudus, Chrysiptera glauca, Pomacentrus pavo, Plectroglyphidodon lacrymatus), the changes in cephalic skeletal ... [more ▼]

This study compares, in five species of Pomacentridae (Chromis viridis, Dascyllus flavicaudus, Chrysiptera glauca, Pomacentrus pavo, Plectroglyphidodon lacrymatus), the changes in cephalic skeletal structures between settling larvae and adults living on the reef. Variations were studied in the suspensorium, the opercle, the mandible, the premaxillary bone and the teeth. Comparisons of the feeding apparatus enabled two different types of feeding to be distinguished in adults: suction feeding and grazer sucking. Adult C. viridis and D. flavicaudus have a high suspensorium, a well-rounded mouth during jaw opening and caniniform teeth. These two species can be considered to be suction feeders. On the other hand, adult C glauca, P pavo and P lacrymatus have less developed suspensoria, opercles and ascending process of the premaxillar, and present incisiform teeth. These three species appear to be grazer suckers. However, the larvae of all five species present an unimodal way of feeding, defined as ram-suction. Differences between larvae and adults appear clearly to be related to their ecology. The increasing variation presented in feeding apparatus during the settlement phase could be linked to diversification leading to occupancy of different ecological niches. [less ▲]

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See detailPreliminary study of effects of anaerobic digestion of manure on VFA content and Odor concentration
Ubeda, Yolanda; Nicolas, Jacques ULg; Calvet, S. et al

Conference (2010, September)

In this study, the potential reduction of odor of anaerobic digestion has been evaluated in three commercial facilities located in Belgium, Luxembourg and Germany. Odor concentrations were measured by ... [more ▼]

In this study, the potential reduction of odor of anaerobic digestion has been evaluated in three commercial facilities located in Belgium, Luxembourg and Germany. Odor concentrations were measured by olfactometric analyses in two different situations: at normal conditions and after the stirring the odor source. Parallel to these measures, representative samples were taken for digested and untreated manure and other co-substrates present in the facilities. Volatile solids, total solids, total suspended solids, volatile suspended solids, soluble chemical oxygen demand, ammonia nitrogen, total kjeldhal nitrogen, volatile fatty acids, and pH were determined in laboratory. The performance of anaerobic digestion in terms of VFA concentration reduction achieved values of 77-96%. Odor concentration was reduced by anaerobic digestion in the two studied scenarios: at normal conditions and after the stirring the odor source. No significant effect of anaerobic digestion on chemical analyses was observed, except for an increase in the ammonia nitrogen content. Significant correlations were found between the logarithm of odor concentration and different odor compounds (VFA, acetic, butyric, isobutyric, isovaleric). Correlations between odor concentration, VFA and other parameters (VS, VSS and pH) were also obtained. These results confirm that anaerobic digestion may reduce odor annoyance potential and VFA concentrations. In addition, odor concentration seems to be related with other chemical parameters, therefore more research is needed to obtain further conclusions. [less ▲]

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See detailPreliminary study of exo-B-1,3-glucanase encoding genes in relation to the protective activity of Pichia anomala (strain K) against Botrytis cinerea on postharvest apples
Grevesse, Cathy; Jijakli, Haissam ULg; Duterme, Olivier et al

in Bulletin OILB/SROP = IOBC/WPRS Bulletin (1998), 21(9), 81-89

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See detailPreliminary study of exo-beta-1,3-glucanase encoding genes in relation to the protective activity of Pichia anomala (strain K) against Botrytis cinerea on postharvest apples.
Grevesse, C.; Jijakli, Mohamed ULg; Duterme, O. et al

in Bulletin OILB/SROP = IOBC/WPRS Bulletin (1998), 21(9),

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See detailPreliminary study of medium-speed monohull passenger ferries
Hetharia, Wolter; Hage, André ULg; Rigo, Philippe ULg

in TURAN, OSMAN (Ed.) International Conference on Technologies, Operations, Logistics and Modelling for Low Carbon Shipping LCS 2011 (2011, June 23)

The recent development of medium-speed monohull passenger ferries has shown their importance for certain routes. The aim of the intensive studies performed in the recent years is to fulfil the pending ... [more ▼]

The recent development of medium-speed monohull passenger ferries has shown their importance for certain routes. The aim of the intensive studies performed in the recent years is to fulfil the pending technical and environmental issues concerning the HSC crafts. They operate at the Froude number range of 0.55 to 0.80 which is beyond the last hump of the wave resistance curve. In fact, they need a high power to maintain their operation speeds. The present project is to find the best design based on the layout of the passenger arrangement and the hull form configurations. The layout includes the seat arrangement and the distribution of passengers at the main and upper decks. Due to the lack of design data base of those kinds of semi-planning ships, a parent ship of 250 passengers is considered in this study. During the design process, the rules and mandatory issues are taken into account. The results of the design parameters and general layout of a series of parent ships are presented in this paper. The results will be applied in a future parametric study, particularly to find the best layout and hull form with the minimum engine power. Keywords: Ship design, general arrangement, engine power, passenger vessel [less ▲]

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See detailPreliminary study of MS-facies relationship in Bajocian-Bathonian carbonates from eastern and north-eastern Paris Basin
Dechamps, Sylvain; Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg

in Koptikova, Leona; Hladil, Jindrich; Adamovic, Jiri (Eds.) Miroslav Krs conference: time, magnetism, records, systems and solution. The 2011 Annual IGCP-580 Meeting. Abstract Volume (2011)

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See detailA preliminary study of parasites and diseases of perch in an intensive culture system
Grignard, Jean-Claude; Mélard, Charles ULg; Kestemont, Patrick

in Journal of Applied Ichthyology (1996), 12

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See detailA preliminary study of serum haptoglobin in bovine fetal blood.
Humblet, Marie-France ULg; Melo de Sousa, Noelita ULg; Boutet et al

in Proceedings of the 6th European Colloquium on Acute Phase Proteins (2006)

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See detailPreliminary study of the Black Sea's plankton bloom
Grégoire, Marilaure ULg; Beckers, Jean-Marie ULg; Nihoul, Jacques ULg et al

in Bulletin de la Société Royale des Sciences de Liège (1996), 65(1), 91-94

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See detailPreliminary study of the Black Sea's plankton bloom
Grégoire, Marilaure ULg; Nihoul, Jacques ULg

in Report of the Second meeting of the international Gobec Numerical Modelling Working Group (1997)

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See detailPreliminary study on the ecomorphological signification of the sound-producing complex in Carapidae
Parmentier, Eric ULg; Chardon, Michel ULg; Vandewalle, Pierre ULg

in Van Damme, Raoul; Aerts, Pieter; D'Août, Kristiaan (Eds.) et al Topics in Functional and Ecological Vertebrate Morphology (2002)

Carapidae can be classified in four ecological groups : pelagic, dermersal, commensal and parasitic. Carapidae display otophysic structures associated with the anterior part of the swim bladder and highly ... [more ▼]

Carapidae can be classified in four ecological groups : pelagic, dermersal, commensal and parasitic. Carapidae display otophysic structures associated with the anterior part of the swim bladder and highly modified labyrinths, which suggest particular acoustic performances. The commensal and parasitic species have the best developed sound-producing features and also the thickest sagitta within the largest otic cavity, and surrounded by the thinnest cranial wall. However, these features do not necessarily imply a direct relation between the sound emission and reception in a given species but suggest a selective pressure lying in the habitat use of the species. The structures involved in sound-production and hearing are seemingly adapted to match the loss of energy of the sonic vibrations when travelling through the host tissues. [less ▲]

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See detailPreliminary survey of the palynological content of the Lower Devonian in the Oesling, Luxembourg
Steemans, Philippe ULg; Debbaut, Vincent ULg; Faber, A.

in Bulletin de la Société des Naturalistes Luxembourgeois (2000), 100

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See detailPreliminary survey on the impact of Schmallenberg virus on sheep flocks in south of Belgium
Saegerman, Claude ULg; Martinelle, Ludovic ULg; Dal Pozzo, Fabiana ULg et al

in Transboundary and Emerging Diseases (in press)

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See detailA preliminary telemetry investigation on the obstacles to anadromous Salmonids migration in spawning streams of the Belgian Ardennes (river Meuse bassin)
Ovidio, Michaël ULg; Birtles, Cymon; Baras, Etienne et al

in Leclerc, Michel (Ed.) Proceedings of the Second IAHR Symposium on Habitat Hydraulics, Ecohydraulique 2000 (1996)

In the course of the 'Meuse Salmon 2000' programme aiming at the restoration of the Atlantic salmon Salmo salar and sea trout Salmo trutta in the River Meuse Basin, most large dams are progressively ... [more ▼]

In the course of the 'Meuse Salmon 2000' programme aiming at the restoration of the Atlantic salmon Salmo salar and sea trout Salmo trutta in the River Meuse Basin, most large dams are progressively equipped with fishways to restore the free circulation of spawners between the North Sea and the first major spawning streams, the River Ourthe and its tributaries. Spawners entering the River Ourthe would still be confronted to so-called minor obstacles, aiming at water regulation for tourism purposes but of which the actual impact on fish migration has never been investigated. In order to test for the actual free-circulation of salmonid spawners in the upper River Ourthe and to locate potential spawning grounds, a probe fish (489 mm FL male sea trout) was tagged with an intraperitoneally implanted radio-transmitter. From the 18th of ovember 1995 onwards, the trout was tracked in a part of the river (44 km upstream of the confluence) which was thought to be devoid of any major obstacle to fish migration. Three days after its release, the trout had migrated over 6 km up to a small weir (1.8 m high). During four consecutive days, the trout was consistently located downstream of the weir but no successful climbing was observed, reflecting the poor efficiency of the central fishpass under dry weather conditions during summer and autumn. The trout then settled in a deep run habitat, 150 m downstream of the weir and no upstream excursion was recorded until the first major rise of water level, four weeks later, even when the weir was opened for water regulation purposes. When the water level was maximum (24th of December), the trout moved upstream of the weir and migrated over 28 km during the next 72 hours up to a spot identified as a potential spawning redd from habitat features, and where it was consistently located till the 31st of December. These results, though most preliminary, clearly indicate that even minor obstacles may cause a substantial lag in trout migration of which the impact on spawning success remains to be determined. Since similar minor man-made obstacles are most frequent in the salmonid spawning streams of the Belgian Ardennes, it is thus uncertain that migratory trout having successfully climbed the major obstacles since the North Sea would find their way to the spawning redds. As a corollary, it is suggested that more detailed case studies should be undertaken, ideally via the use of telemetered probe-fish, in order to provide management policies that would represent a suitable compromise between users of water resources with apparently conflicting interests (water regulation, tourism, nature conservancy). [less ▲]

Detailed reference viewed: 49 (8 ULg)