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See detailParana Medio, a multipurpose transport development (Argentina).
Marchal, Jean ULg

Report (1988)

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See detailParapet wall effect on Piano Key Weirs efficiency
Machiels, Olivier; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Journal of Irrigation & Drainage Engineering (2013), 139(6), 506-511

Piano Key Weir is a cost effective solution for rehabilitation as well as for new dam projects with a high level of constraints (limited space, high specific flood discharge, small reservoir level ... [more ▼]

Piano Key Weir is a cost effective solution for rehabilitation as well as for new dam projects with a high level of constraints (limited space, high specific flood discharge, small reservoir level variation). While the higher efficiency of the Piano Key Weir compared to standard linear weirs has already been demonstrated, its optimal geometry is still poorly defined. In order to improve the design of the complex geometry of this structure, the use of parapet walls has been tested. They consist of vertical extensions placed over the weir crest. Following a former study of the influence of the weir height on its discharge capacity, this paper presents the results of an experimental campaign dedicated to investigating the effect of parapet walls to increase weir height while reducing bottom slopes and keeping the weir height constant. These results indicate the relative influences of the alveoli bottom slopes and of the weir height on the Piano Key Weir release capacity. Comparisons with former experimental results as well as design guidelines are also provided. [less ▲]

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See detailParaplégie traumatique. Mise au point et analyse d'un modèle expérimental.
Martin, Didier ULg; Delrée, P.; Leprince, Pierre ULg et al

Conference (1989, March)

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See detailParapsoriasis en plaques.
HERMANNS-LE THI KIM, Trinh ULg; PIERARD, Gérald ULg

in Thérapeutique Dermatologique (2012)

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See detailParasite communities: Patterns and Processes
Rentier, Bernard ULg

in Book Reviews, Biochemical Systematics and Ecology (G. Esch, A. Bush & J. Aho, eds., Chapman & Hall, 1990) (1991)

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See detailA parasite reveals cryptic phylogeographic history of its host.
Nieberding, C.; Morand, S.; Libois, Roland ULg et al

in Proceedings of the Royal Society B : Biological Sciences (2004), 271(1557), 2559-68

This study compares the continental phylogeographic patterns of two wild European species linked by a host-parasite relationship: the field mouse Apodemus sylvaticus and one of its specific parasites, the ... [more ▼]

This study compares the continental phylogeographic patterns of two wild European species linked by a host-parasite relationship: the field mouse Apodemus sylvaticus and one of its specific parasites, the nematode Heligmosomoides polygyrus. A total of 740 base pairs (bp) of the mitochondrial cytochrome b (cyt b) gene were sequenced in 122 specimens of H. polygyrus and compared with 94 cyt b gene sequences (974 bp) previously acquired for A. sylvaticus. The results reveal partial spatial and temporal congruences in the differentiation of both species' lineages: the parasite and its host present three similar genetic and geographical lineages, i.e. Western European, Italian and Sicilian, and both species recolonized northwestern Europe from the Iberian refuge at the end of the Pleistocene. However, H. polygyrus presents three particular differentiation events. The relative rate of molecular evolution of the cyt b gene was estimated to be 1.5-fold higher in the parasite than in its host. Therefore, the use of H. polygyrus as a biological magnifying glass is discussed as this parasite may highlight previously undetected historical events of its host. The results show how incorporating phylogeographic information of an obligate associate can help to better understand the phylogeographic pattern of its host. [less ▲]

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See detailParasites and biotic diseases in field and cultivated sea cucumbers
Eeckhaut, Igor; Parmentier, Eric ULg; Becker, P. et al

in Lovatelli, A.; Conand, C.; Purcell, S. (Eds.) et al Advances in sea cucumber aquaculture and management (2004)

Amongst echinoderms, the Holothuroidea represents the class that is the most infested by parasites. Parasites of holothuroids are Bacteria, Protozoa and Metazoa. There are about 150 species of metazoans ... [more ▼]

Amongst echinoderms, the Holothuroidea represents the class that is the most infested by parasites. Parasites of holothuroids are Bacteria, Protozoa and Metazoa. There are about 150 species of metazoans which parasite holothuroids. Most of them are turbellarians, gastropods, copepods, crabs or fishes. The main body compartments suffering of the infestations are the digestive system and the coelom. The diseases induced by metazoan parasites are mostly structural: they create galls at the surface of the epidermis, pierce the respiratory tree or dig into the body wall down to the coelom. Most metazoans that live in the digestive system do not induce obvious diseases and their relationship with their hosts is probably close to commensalism. Most Protozoa that parasite holothuroids are sporozoans. They occur mainly in the coelom and/or the haemal system, one species having been reported infesting the gonads. Even in heavily infested hosts, the signs of disease induced by sporozoans are low: at most, host haemal lacuna is occluded by trophozoites or cysts are formed into the coelomic epithelium. The most pathogen agents reported from cultured sea cucumbers are Bacteria. Cultivated holothuroids may suffer from a bacterial disease, called skin ulceration disease, that affects their body wall. In particular, juvenile Holothuria scabra reared in the Aqua-Lab hatchery of Toliara, Madagascar, suffered from such a disease that caused death within three days. The first sign of the infection is a white spot that appears on the integument of individuals, close to the cloacal aperture. The spot extends quickly onto the whole integument leading to the death of individuals. The lesions consist in a zone where the epidermis is totally destroyed and where collagen fibres and ossicles are exposed to the external medium. This zone is surrounded by a border line where degrading epidermis is mixed with connective tissue. Lesions include three bacterial morphotypes: rod-shaped bacteria, rough ovoid bacteria, and smooth ovoid bacteria. Three species of bacteria have also been put in evidence in the white spot lesions thanks to biomolecular analyses (DGGE and sequencing): Vibrio sp., Bacteroides sp., and an a-Proteobacterium. [less ▲]

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See detailParasites and the island syndrome: the colonization of the western Mediterranean islands by Heligmosomoides polygyrus (Dujardin, 1845)
Nieberding, Caroline M. ULg; Morand, S.; Libois, Roland ULg et al

in Journal of Biogeography (2006), 33(7), 1212-1222

Aim Populations of free-living vertebrates on islands frequently differ from their mainland counterparts by a series of changes in morphometric, life-history, behavioural, physiological and genetic traits ... [more ▼]

Aim Populations of free-living vertebrates on islands frequently differ from their mainland counterparts by a series of changes in morphometric, life-history, behavioural, physiological and genetic traits, collectively referred to as the 'island syndrome'. It is not known, however, whether the 'island syndrome' also affects parasitic organisms. The present study establishes the colonization pattern of the Mediterranean islands by the nematode Heligmosomoides polygyrus, a direct and specific parasite of rodent hosts of the Apodemus genus, and evaluates the effects of island colonization by this species on two components of the island syndrome: the loss of genetic diversity and the enlargement of the ecological niche. Location Heligmosomoides polygyrus was sampled on seven western Mediterranean islands - Corsica, Crete, Elba, Majorca, Minorca, Sardinia and Sicily - as well as in 20 continental locations covering the Mediterranean basin. Methods The mitochondrial cytochrome b gene (690 base pairs) was sequenced in 166 adult H. polygyrus individuals sampled in the 27 continental and island locations. Phylogenetic reconstructions in distance, parsimony, maximum likelihood and Bayesian posterior probabilities were carried out on the whole cytochrome b gene data set. The levels of nucleotide, haplotype and genetic divergence (Kimura two-parameter distance estimator) diversities were estimated in each island population and in the various continental lineages. Results Phylogenetic reconstructions show that the mainland origins of H. polygyrus were continental Spain for the Balearic Islands (Majorca, Minorca), northern Italy for the Tyrrhenian Islands (Corsica, Sardinia, Elba), southern Italy for Sicily, and the Balkan region for Crete. A comparison of island H. polygyrus populations with their mainland source populations revealed two characteristic components of the island syndrome in this parasite. First, island H. polygyrus populations display a significant loss of genetic diversity, which is related (r(2) = 0.73) to the distance separating the island from the mainland source region. Second, H. polygyrus exhibits a niche enlargement following insularization. Indeed, H. polygyrus in Corsica is present in both A. sylvaticus and Mus musculus domesticus, while mainland H. polygyrus populations are present exclusively in Apodemus hosts. Main conclusions Our results show that H. polygyrus has undergone a loss of genetic diversity and a niche (host) enlargement following colonization of the western Mediterranean islands. To our knowledge, this study provides the first evidence for components of the 'island syndrome' in a parasitic nematode species. [less ▲]

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See detailParasitic interference in nulling interferometry
Matter, A.; Defrère, D.; Danchi, W. C. et al

in Monthly Notices of the Royal Astronomical Society (2013), 431(2), 1286-1295

Nulling interferometry aims to detect faint objects close to bright stars. Its principle is to produce a destructive interference along the line of sight so that the stellar flux is rejected, while the ... [more ▼]

Nulling interferometry aims to detect faint objects close to bright stars. Its principle is to produce a destructive interference along the line of sight so that the stellar flux is rejected, while the flux of the off-axis source can be transmitted. In practice, various instrumental perturbations can degrade the nulling performance. Any imperfection in phase, amplitude or polarization produces a spurious flux that leaks to the interferometer output and corrupts the transmitted off-axis flux. One of these instrumental perturbations is the crosstalk phenomenon, which occurs because of multiple parasitic reflections inside transmitting optics, and/or diffraction effects related to beam propagation along finite size optics. It can include a crosstalk of a beam with itself, and a mutual crosstalk between different beams. This can create a parasitic interference pattern, which degrades the intrinsic transmission map - or intensity response - of the interferometer. In this context, we describe how this instrumental effect impairs the performance of a Bracewell interferometer. A simple formalism is developed to derive the corresponding modified intensity response of the interferometer, as a function of the two parameters of interest: the crosstalk level (or contamination rate) and the phase shift between the primary and secondary - parasitic - beams. We then apply our mathematical approach to a few scientific cases, both analytically and using the GENIESIM simulation software, adapted to handle coherent crosstalk. Our results show that a coherent crosstalk level of about 1 per cent implies a 20 per cent drop of the signal-to-noise ratio at most. Careful attention should thus be paid to reduce the crosstalk level inside an interferometric instrument and ensure an instrumental stability that provides the necessary sensitivity through calibration procedures. [less ▲]

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See detailParásitos en primates de la Amazonía Ecuatoriana: una herramienta para la salud pública y la conservación
Martin, Sarah ULg; Carrillo-Bilbao, Gabriel Alberto; Celi, Maritza et al

Conference (2012, June 22)

Los primates son reservorios de patógenos humanos ya sea que estén en libertad o en cautiverio. Si identificamos los parásitos y las enfermedades que estos ocasionan en primates, sería una herramienta ... [more ▼]

Los primates son reservorios de patógenos humanos ya sea que estén en libertad o en cautiverio. Si identificamos los parásitos y las enfermedades que estos ocasionan en primates, sería una herramienta para su conservación y un aporte significativo para la salud pública. Colectamos e identificamos los parásitos gastrointestinales de 10 especies de primates de la Amazonía ecuatoriana. Se utilizo la técnica de flotación con solución de azúcar sobre saturada (d≈1.28 - 1.33) y la técnica de Ritchie. Las muestras fueron analizadas según factores extrínsecos e intrínsecos de los primates. Los valores generales de prevalencia para protozoarios y helmintos fueron de 17.6% y 55.4% respectivamente. Infecciones con un solo parásito fueron observadas en 46% de las muestras e infecciones con dos o más parásitos fueron observadas en tan solo 17.6% de las muestras. Las hembras tuvieron mayor prevalencia (93.33%) que los machos (68.75%). Más de la mitad de los parásitos encontrados en este estudio (Necator/Ancylostoma, Capillaria sp., Strongylus sp., Entamoeba histolytica, Hymenolepis sp., Oesophagostomum sp.) son una amenaza potencial de transmisión zoonótica. Lagothrix lagotricha tiene la mayor diversidad de parásitos (7) en comparación con las otras especies de primates estudiadas. Este estudio muestra una diversidad de parásitos de importancia zoonótica, lo cual demuestra el interés que deber presentarse tanto para el manejo de fauna silvestre como para programas de salud pública. [less ▲]

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See detailParasympathetic component of 5-hydroxytryptamine-induced pulmonary dysfunctions in health calves
Linden, Annick ULg; Desmecht, Daniel ULg; Amory, Hélène ULg et al

in American Journal of Veterinary Research (1996), 57(6), 896-901

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See detailParathormone and bone-specific alkaline phosphatase for the follow-up of bone turnover in hemodialysis patients : Is it so simple?
DELANAYE, Pierre ULg; DUBOIS, Bernard ULg; JOURET, François ULg et al

in Clinica Chimica Acta (2013), 417

Background: Chronic Kidney Disease (CKD) is associated with mineral and bone disorders (MBD). International guidelines suggest that levels of serum parathormone (PTH) or bone-specific alkaline phosphatase ... [more ▼]

Background: Chronic Kidney Disease (CKD) is associated with mineral and bone disorders (MBD). International guidelines suggest that levels of serum parathormone (PTH) or bone-specific alkaline phosphatase (b-ALP) can be used to evaluate MBD in dialysis patients. The evidence remains moderate and based on transversal studies. <br />Methods: We retrospectively investigated the variations of PTH (ΔPTH) and b-ALP (Δb-ALP) serum concentrations over a short (6-weeks) and a long (one-year) period in a monocentric hemodialysis population. The proportion of patients reaching the critical difference (CD) (50% for PTH and 25% for b-ALP) was calculated. <br />Results: Seventy-seven patientswere included. A significant correlation between PTHand b-ALP levelswas found at baseline (r=0.51). By contrast, no correlation was observed between ΔPTH and Δb-ALP over a 6-week interval (r=0.07). The CD for PTH and b-ALP was reached by 19 and 11 patients, respectively, with 2 patients showing consistent variations of both biomarkers. One year later, measurements were repeated in 48 survivors. <br />No correlation was found between ΔPTH and Δb-ALP (r=0.27). The CD for PTH or b-ALP was reached by 24 patients and 28 patients, respectively, with 6 patients (12.5%) showing opposite results for both biomarkers. <br />Conclusion: This study shows the lack of correlation between ΔPTH and Δb-ALP over time in patients under chronic hemodialysis. [less ▲]

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See detailParathyroid hormone in the treatment of involutional osteoporosis : back to the future
Reginster, Jean-Yves ULg; Taquet, AN; Fraikin, G et al

in Osteoporosis International (1997), 7(S2), 7

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See detailParathyroid Hormone in the Treatment of Involutional Osteoporosis: Back to the Future
Reginster, Jean-Yves ULg; Taquet, A. N.; Fraikin, G. et al

in Osteoporosis International (1997), 7(Suppl 3), 163-8

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See detailParathyroid hormone plasma concentration in response to low 25-OH vitamin D circulating levels increase with age in elderly women
DEROISY, Rita ULg; Taquet, AN; Dewe, W et al

in Osteoporosis International (1998), 8(S3), 40

Detailed reference viewed: 16 (1 ULg)