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See detailThe Unionid mussels (Mollusca, Bivalvia) of the Belgian upper river Meuse: an assessment of the impact of hydraulic works on the river water self-purification
Libois, Roland ULg; Hallet, Catherine

in Biological Conservation (1987), 42

In september 1983, the nine weirs regulating the flow of the river Meuse between Givet (France) and Namur (Belgium) were kept fully open for technical purposes. The water level therefore dropped, allowing ... [more ▼]

In september 1983, the nine weirs regulating the flow of the river Meuse between Givet (France) and Namur (Belgium) were kept fully open for technical purposes. The water level therefore dropped, allowing the sampling of benthic organisms and the mapping of the different kinds of banks. For each bank type, the density of unionids mussels was measured. Silt and fine gravel bottoms are the preferred habitats of these mussels. In these natural habitats, the mean biomass is estimated at more than 1.8 tonnes/ha. In pebbles this value is near 1 tonne/ha whereas in the stony blocks and on rocky bars it falls to 165 kg/ha. Man made banks are poor biotopes: 297 kg mussels/ha on old stoneworks and only 65 kg/ha on recent ones. When the filtration rate is considered, is can be shown that, at the time this study was under taken, the unionid mussels living on the Meuse banks filtered more than 300 litres water/sec. This rate will drop to 27 litres/sec within only a few years if the designed hydraulic works are carried out. This study emphasises the negative effects of these works on the self-purification capacity of the river. [less ▲]

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See detailA comparison of bovine growth hormone expression directed by bGH genomic or intronless DNA in transiently transfected eukaryotic cells.
Pasleau, Françoise ULg; Leung, F. C.; Kopchick, J. J.

in Gene. (1987), 57

Two recombinant DNA plasmids were constructed with identical transcriptional and translational regulatory elements controlling expression of the bovine growth hormone (bGH) gene or the bGH gene lacking ... [more ▼]

Two recombinant DNA plasmids were constructed with identical transcriptional and translational regulatory elements controlling expression of the bovine growth hormone (bGH) gene or the bGH gene lacking introns. Transient expression of these plasmids in cultured eukaryotic cells, monitored by assaying secretion of bGH into the culture medium, was employed to examine the relative importance of introns in the expression of this gene. The bGH gene lacking introns is expressed more efficiently than the bGH gene in avian and mammalian cells. [less ▲]

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See detailRelations between nucleoli and nucleolus-organizing regions during the cell cycle
Goessens, Guy ULg; Thiry, Marc ULg; Lepoint, Alain

in Chromosomes Today (1987), 9

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See detailComportement d'adoption d'une nichée par un martin-pêcheur (Alcedo atthis) adulte
Libois, Roland ULg

in Cahiers d'Ethologie (1987), 7(3), 287-292

In the spring of 1986, a nesting male Kingfisher was accidentally drown during ringing operation. He was the father of five 11 days old nestlings which later starved to death. His female was meanwhile ... [more ▼]

In the spring of 1986, a nesting male Kingfisher was accidentally drown during ringing operation. He was the father of five 11 days old nestlings which later starved to death. His female was meanwhile brooding a second clutch. This cluth has been raised by a foster-father (an unknown adult male) whereas the female started a third clutch. [less ▲]

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See detailL'endotoxémie dans l'espèce équine. 2ème partie: tableau clinique et éléments de pronostic.
Amory, Hélène ULg

in Pratique Vétérinaire Equine (1987), 29

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See detailPhytoplankton Biomass and Production in the River Meuse (Belgium)
Descy, JP; Servais, P; Smitz, J.S. et al

in Water Research (1987), 21(12), 1557-1566

The biomass and production of the phytoplankton in a relatively unpolluted reach of the river Meuse (Belgium) were followed through two years (1983 and 1984).

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See detailAtlas des mammifères sauvages de Wallonie. Le ragondin, Myocastor coypus (Molina, 1782)
Libois, Roland ULg

in Cahiers d'Ethologie (1987), 7(3), 303-308

Several observations or kills feral coypus are reported over southern Belgium (Wallony). They are not confined to any natural region or watercourse system. Since their frequency seems to be increasing, it ... [more ▼]

Several observations or kills feral coypus are reported over southern Belgium (Wallony). They are not confined to any natural region or watercourse system. Since their frequency seems to be increasing, it is to be feared that this rodent will develop well established or expanding populations [less ▲]

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See detailEtude du régime alimentaire du sanglier (Sus scrofa L.) dans les Ardennes belges
Palata Kabudi, Jean Claude; Fetter, Serge; Libois, Roland ULg et al

in Cahiers d'Ethologie (1987), 7(3), 223-246

The wild boar's diet is investigated in two forests of the Belgian Ardenne: the Nismes deciduous forest and the Transinne coniferous plantations. Two complementary approach are compared: analysis of ... [more ▼]

The wild boar's diet is investigated in two forests of the Belgian Ardenne: the Nismes deciduous forest and the Transinne coniferous plantations. Two complementary approach are compared: analysis of faeces collected throughout the year and analysis of stomach contents during the hunting season only. The faeces analysis method allows to follow the diet seasonal variations but conceals the occurence of some feed and minimizes the ingestion of vertebrates and of artificial fodder. It results from both approaches that wild boars are opportunist and omnivorous with an obvious tendency to herbivory. The human influence, direct (artificial supply) or indirect (neighbouring cultivated open fields, forest and game management, enclosure, lot of disturbances), plays the leading part in determining wild boar's diet and its food search. As a whole, plant products from natural origin come in second place in its diet whereas other feed always remain occasional, with the exception of acorn and beech mast when superabouding. A few suggestions for reducing wild boar's damage to crop and forests close the paper [less ▲]

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See detailEssai de modélisation du transfert d'énergie dans la chaïne trphique en baie de Calvi
Dauby, Patrick ULg

in Annales de la Société Royale Zoologique de Belgique (1987), 117

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See detailAnti SSA and anti SSB autoantibodies: an immunofluorescence, ultrastructural and immunoblotting study
Thiry, Marc ULg; Vigneron, Alain; Humbel, René et al

Poster (1987)

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See detailIs a low-mass top quark ruled out?
Cudell, Jean-René ULg; Halzen, F.; He, X. G. et al

in Physics Letters B (1987), 196

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See detailAvoided crossings: a study of the non-adiabatic transition probability
Desouter, Michèle ULg; Leyh-Nihant, Brigitte; Praet, Marie-Thérèse ULg et al

in Journal of Chemical Physics (1987), 86

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See detailEtude cytochimique et immunocytochimique du nucléole
Thiry, Marc ULg

Scientific conference (1987)

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