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See detailStudy of catalase production by an Aspergillus phoenicis mutant strain in date flour extract submerged cultures
Kacem-Chaouche, Noreddine; Maraihi; Destain, Jacqueline ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2005), 9(3), 173-178

The production of extracellular catalase in date flour submerged medium by a selected mutant Aspergillus phoenicis K30 (member of the Aspergillus niger group) was investigated. The strain was tested in ... [more ▼]

The production of extracellular catalase in date flour submerged medium by a selected mutant Aspergillus phoenicis K30 (member of the Aspergillus niger group) was investigated. The strain was tested in 500 ml shake-flasks and in a 20 l bioreactor with date powder as a single carbon source. Extracellular catalase production reached 59 U ml-1 in both cases. This value is much greater than that of a wild-type strain (9.5 U ml-1). Microscopic examination showed that the extracellular catalase production was correlated with the ramified hyphals morphology in the external layer of the pellets. [less ▲]

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See detailContribution a l'etude des effets perturbateurs endocriniens des polluants environnementaux
Charlier, Corinne ULg

in Bulletin et Mémoires de l'Académie Royale de Médecine de Belgique (2005), 160(5-6), 301-10

There is an increasing scientific concern that organochlorine compounds, recognized as environmental act through their estrogenic or anti-estrogenic properties. Many endocrine diseases can be concerned by ... [more ▼]

There is an increasing scientific concern that organochlorine compounds, recognized as environmental act through their estrogenic or anti-estrogenic properties. Many endocrine diseases can be concerned by the pathogenic role on environmental residues in their promotion. The carcinogenic potential of environmental xenoestrogens on breast cancer is a matter of controversy. In Europe, despite their prohibition since the 70's, residues persist in soil and rivers, resulting in a widespread contamination of the general population. Our results suggest that environmental exposure to p,p' -DDE, HCB or PCBs may contribute to multifactorial pathogenesis of breast cancer. Male infertility is also a matter of concern. Our data suggest that male infertility can be associated with exposure of the mothers to p,p'-DDE, and that deleterious effects are probably restricted to intra-uterine life. Early or precocious puberty in children adopted from developing countries where organochlorines are still used is frequently reported. A possible relationship with exposure to DDT is suggested. There are two possible pathways to account for precocious puberty following chronic exposure to estrogenic related compounds: weak stimulation of estrogen sensitive tissues or removal in Belgium of the suppressing effects of estrogens on gonadotrophins, suppressing effect that was due to exposure in the country of origin. [less ▲]

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See detailReply to the discussion on the Report of Committee III.1 – ISSC’2003 "Ultimate Strength"
Rigo, Philippe ULg

in 15th Int. Ship and Offshore Structures Congress (2005)

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See detailDiscussion on the Report of Committee IV.2 – ISSC’2003 "Design Methods"
Rigo, Philippe ULg

in 15th Int. Ship and Offshore Structures Congress (2005)

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See detailDiscussion on Paper D04 “Ultimate limit state design technology for aluminium multi-hull ship structures, SNAME Transactions, Vol.113, (2005)”
Rigo, Philippe ULg; Richir, Thomas

in Ultimate limit state design technology for aluminium multi-hull ship structures, SNAME Transactions, Vol.113 (2005)

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See detailA rapid estimation of nitrogen bound to neutral detergent fibre in forages by near infrared reflectance spectroscopy.
Bindelle, Jérôme ULg; Sinnaeve, Georges; Dardenne, Pierre et al

in XXth International Grassland Congress: Offered papers (2005)

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See detailFilière Grandes cultures : rapport 2005
Duquesne, Brigitte ULg; Matendo, Sadrac

Report (2005)

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See detailConsommation de sucres et produits sucrés : rapport 2005
Duquesne, Brigitte ULg; Matendo, Sadrac

Report (2005)

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See detailEvolution de la consommation de plats préparés
Duquesne, Brigitte ULg; Matendo, Sadrac

Report (2005)

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See detailEvolution des dépenses pour la restauration hors domicile
Duquesne, Brigitte ULg; Matendo, Sadrac

Report (2005)

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See detailProtocole de Kyoto : aménagement du territoire, mobilité et urbanisme
Boniver, Véronique ULg; Daxhelet, Delphine; Klinkenberg, Anne-Catherine et al

Book published by Service Public de Wallonie (2005)

L'ouvrage analyse différentes mesures pour faciliter l'adhésion de la Région wallonne au Protocole de Kyoto. Trois types de mesures sont présentées en vue de réduire les émissions de gaz à effet de serre ... [more ▼]

L'ouvrage analyse différentes mesures pour faciliter l'adhésion de la Région wallonne au Protocole de Kyoto. Trois types de mesures sont présentées en vue de réduire les émissions de gaz à effet de serre : des mesures pour limiter la croissance de la mobilité en voiture; pour améliorer les performances énergétiques en matière d'urbanisme et pour limiter les effets de la modification des régimes hydriques. [less ▲]

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See detailInterannual variations of the carbon monoxide tropospheric burden between 30ºN and 90ºN in 1996-2003: ground-based and satellite measurements, estimate of biomass burning emissions
Yurganov, L. N.; Edwards, D. P.; Grechko, E. I. et al

in Geophysical Research Abstracts (2005), 7(EGU05-A-03850),

Carbon monoxide total column amounts in the atmosphere were measured in the High Northern Hemisphere (30º-90º N, HNH) between January 1996 and December 2003 using Fourier Transform Infrared high ... [more ▼]

Carbon monoxide total column amounts in the atmosphere were measured in the High Northern Hemisphere (30º-90º N, HNH) between January 1996 and December 2003 using Fourier Transform Infrared high resolution spectrometers installed at the NDSC (Network for Detection of Stratospheric Change) sites. A grating spectrometer of moderate resolution was employed for the same purpose at the Zvenigorod Research Station of the Institute of Atmospheric Physics near Moscow. CO mixing ratios were measured in the air samples obtained at the ground-level stations of the CMDL (Climate Modeling and Diagnostic Laboratory, NOAA) network. Total column CO amounts were measured from space by the Terra/MOPITT instrument between March, 2000, and December, 2003 (Edwards et al., 2004). Anomalies of monthly mean CO densities (related to a quiet period of 2000 - 2001) for different sites in the HNH were in agreement. This fact confirmed a good mixing of CO in the Northern Hemisphere on the montly basis that may be expected from a 1.5-2-month-long CO life-time. The data were integrated over the HNH reservoir (0-10 km in altitude and 30º-90º N in latitude) and the CO burden anomalies (in Tg) were analysed using a box model. Two CO sinks were taken into account: i) internal chemical removal in the reaction between CO and OH, and ii) transport of CO into the southertn part of the Northern hemisphere, where CO concentrations are usually lower. OH concentarations were taken from Spivakovsky et al. (2000). The air exchange through the 30º N boundary of the reservoir was estimated using the GEOS-CHEM model with a real meteorology of 1998 (Yurganov et al., 2004). The interannual variations of the sinks were neglected; a corresponding uncertainty in the retrieved source anomaly was estimated to be 20-30%. Since 1996 four years have been found to experience high CO emission of similar magnitude (1996, 1998, 2002, and 2003). During four years (1997, 1999, 2000, and 2001) the emissions were relatively low. Seasonal patterns of the emissions in active years were similar, maxima occured in July-August. However, in 2003 emissions in June-July were higher than in August. These semi-hemisphere averaged emission rates correlate with Siberian forest fire counts detected at night time by the ATSR radiometer of the ERS-2 satellite (R2 =0.51). The early peak of 2003 may be attributed to forest fires in Baikal region, Siberia. An inclusion of fire counts for other areas (Europe, North America) only worsen the correlation; this implies a decisive role of the Siberian fires for polluting the Northern Hemisphere troposphere (cf., Kasischke et al., 2005). It was estimated that the boreal forest fires during active years emit 30-60 Tg CO per month in July-August and 150-200 Tg annually. These emissions may be compared to industrial and transport pollution in the Northern Hemisphere estimated by Kasischke et al. (2005) as 290 Tg CO annually (i.e., 25 Tg monthly). [less ▲]

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See detailRésumé de thèse - Le système latéral du bar, Dicentrarchus labrax, et les conséquences d'un dysfonctionnement sur son comportement: action potentielle des ions métalliques
Faucher, Karine ULg

in Cybium (2005), 29(2), 118

Le système latéral est un organe sensoriel présent chez les poissons et utilisé pour l'identification et la localisation d'obstacles, la détection des objets en mouvement (proies, prédateurs, nage en banc ... [more ▼]

Le système latéral est un organe sensoriel présent chez les poissons et utilisé pour l'identification et la localisation d'obstacles, la détection des objets en mouvement (proies, prédateurs, nage en banc, parade sexuelle) et la rhéotaxie. L'intégrité morphologique et fonctionnelle de ce système sensoriel apparaît donc comme un élément indispensable à la présence et à la survie d'un poisson dans un écosystème. Or, de part sa localisation à l'interface entre l'animal et le milieu, et par le fait qu'il fonctionne via des flux d'ions, cet organe sensoriel pourrait être la cible d'une pollution d'origine naturelle ou anthropique. Le but de cette étude était d'examiner l'impact d'une pollution métallique du milieu (et en particulier de l'ion cadmium) sur l'état tissulaire et fonctionnel du système latéral du bar, Dicentrarchus labrax (L.), puis d'observer les conséquences comportementales induites sur des groupes d'individus évoluant dans des conditions contrôlées de laboratoire. Une étude préliminaire des caractéristiques morphologiques et de la distribution spatiale des neuromastes composant le système latéral du bar a révélé la présence de deux types de neuromastes (superficiels et canaux) répartis sur la tête, le tronc et la queue. Le gradient décroissant de capacité sensorielle, mis en évidence de l'extrémité rostrale à l'extrémité caudale de la ligne latérale troncale du bar, est très original et pourrait jouer un rôle dans le fonctionnement du système latéral. L'axe de sensibilité majeure des deux types de neuromastes du système latéral troncal s’aligne selon l'axe longitudinal du poisson, ce qui lui confère une sensibilité accrue aux stimuli appliqués le long de son corps. L'inactivation artificielle du système latéral du poisson entraîne une réduction de son exploration verticale de l'habitat. Par contre, aucun effet sur sa prise alimentaire nocturne n’est constaté lorsque cette prise est constituée de proies inertes ; un système de compensation sensorielle orienté sur le système olfactif se mettant en place très rapidement. Les conséquences comportementales d'une exposition aiguë du bar à l'ion métallique cadmium ont ensuite été examinées. Le cadmium à forte concentration dans l'eau de mer (5 µg.l-1) a un effet inhibiteur sur la réponse de fuite des poissons face à un danger. Cet effet comportemental s'accompagne de la destruction des deux types de neuromastes composant le système latéral. Après 21 jours, on constate une régénération des tissus des neuromastes, ainsi qu'une restauration du comportement de fuite des poissons. Par contre, lors de l'exposition aiguë au cadmium à la concentration rencontrée en milieu naturel contaminé (0,5 µg.l-1), le comportement de fuite du poisson n'est pas modifié et les tissus des neuromastes demeurent intacts. Cependant, les stimuli appliqués lors de cette étude pour simuler un danger étant relativement forts, on peut se demander si après une exposition aiguë au cadmium à 0,5 µg.l-1, le bar serait toujours capable de détecter le mouvement ténu d'une proie vivante mobile. Ce travail mériterait d'être poursuivi par des études visant à déterminer la concentration seuil de cadmium responsable de dommages tissulaires au niveau des neuromastes et celle causant des désordres comportementaux. Il serait également intéressant d'examiner l'effet synergique des ions métalliques présents dans le milieu naturel (cadmium, cobalt, cuivre, mercure, nickel, plomb, zinc, etc.…) sur le système latéral et le comportement du bar. [less ▲]

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See detailStudy of cavernous underground conduits in Nam La (Northwest Vietnam) by an integrative approach
Tam, V. T.; De Smedt, F.; Batelaan, Okke et al

in Hydrogeology Journal (2005), 13(5-6), 675-689

This paper presents the result of an investigation of underground conduits, which connect the swallow holes and the resurgence of a blind river in the tropical, highly karstified limestone Nam La ... [more ▼]

This paper presents the result of an investigation of underground conduits, which connect the swallow holes and the resurgence of a blind river in the tropical, highly karstified limestone Nam La catchment in the NW of Vietnam. The Nam La River disappears underground in several swallow holes near the outlet of the catchment. In the rainy season this results in flooding upstream of the sinkholes. A hypothesis is that the Nam La River resurges at a large cavern spring 4.5 km east of the catchment outlet. A multi-thematic study of the possible connections between the swallow holes and the resurgence was carried out to investigate the geological structure, tectonics, cave structure analysis and discharge time series. The existence of the underground conduits was also tested and proven by tracer experiments. On the basis of a lineament analysis the location of the underground conduits were predicted. A remote sensing derived lineament-length density map was used to track routes from the swallow holes to the resurgence, having the shortest length but highest lineament density. This resulted in a plan-view prediction of underground conduits that matches with the cave and fault development. The functioning of the conduits was further explained by analysing flooding records of a nearby doline, which turns out to act as a temporary storage reservoir mitigating flooding of the catchment outlet area. [less ▲]

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See detailStochastic analysis of the effect of heterogeneity and fractures on radionuclide transport in a low-permeability clay layer
Huysmans, Marijke; Dassargues, Alain ULg

in Environmental Geology (2005), 48(7), 920-930

Deep low-permeability clay layers are considered as safe environments for disposal of high-level radioactive waste. In Belgium, the Boom Clay is a candidate host rock for deep geological disposal. In this ... [more ▼]

Deep low-permeability clay layers are considered as safe environments for disposal of high-level radioactive waste. In Belgium, the Boom Clay is a candidate host rock for deep geological disposal. In this study, we analyze the effects of fractures and spatially variable hydraulic conductivity on radionuclide migration through the clay. Fracture geometry and properties are simulated with Monte Carlo simulation. The heterogeneity of hydraulic conductivity is simulated by direct sequential co-simulation using measurements of hydraulic conductivity and four types of secondary variables. The hydraulic conductivity and fracture simulations are used as input for a transport model. Radionuclide fluxes computed with this heterogeneous model are compared with fluxes obtained with a homogeneous model. The output fluxes of the heterogeneous model differ at most 8% from the homogeneous model. The main safety function of the Boom Clay is thus not affected by the fractures and the spatial variability of hydraulic conductivity. [less ▲]

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See detailOrganisation d'une criée en Belgique : exemple de la Criée de Malines.
Bindelle, Jérôme ULg

Article for general public (2005)

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