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See detailPCB trends and patterns in the plankton of the river Meuse (Belgium).
Joaquim-Justo, Célia ULg; Schockert, Vincianne ULg; Deguée, N et al

Poster (2002, May 12)

PCB concentrations were monitored in the river Meuse (Belgium) from 1993 to 1998; compartments sampled were water, suspended matter (mainly phytoplankton), zooplankton and sediment. The PCB patterns were ... [more ▼]

PCB concentrations were monitored in the river Meuse (Belgium) from 1993 to 1998; compartments sampled were water, suspended matter (mainly phytoplankton), zooplankton and sediment. The PCB patterns were compared to those of Aroclors and found to best match a mixture of 30 to 40% of Aroclor 1254 and 60 to 70% of Aroclor 1260 for all compartments with the exception of suspended matter where the proportions were of 50% of both Aroclor 1254 and 1260. These patterns together with the average total concentrations did not show any trends throughout the monitoring period nor did they show any particular seasonal pattern variations. Mean total PCBs concentrations were of 0.029 ng/g in the water, 3408 ng/g D.W. in suspended matter, 862 ng/g D.W. in zooplankton and 387 ng/g D.W. in the sediment. Bioconcentration factors for phytoplankton (suspended matter) and zooplankton were respectively of 118 000 and 30 000 indicating there is no biomagnification between these two trophic levels. These results will be commented on the basis of in vitro contamination experiments with planktonic organisms. [less ▲]

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See detailDe PCB/dioxine vergiftiging in België (1999): analyse van de gezondheidsrisico’s
Bernard, A.; Broekaert, F.; De Poorter, G. et al

in Vlaams Diergeneeskundig Tijdschrift (2001), 70

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See detailPCBs versus PBDEs: how similar compounds can behave differently in harbour porpoises
Weijs, Liesbeth; Yang, R. S. H.; Das, Krishna ULg et al

in Organohalogen Compounds (2011)

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See detailPCBs, PBDEs AND THEIR HYDROXYLATED METABOLITES IN SERUM OF FREE-RANGING HARBOUR SEALS (PHOCA VITULINA): LEVELS AND PROFILES
Weijs, Liesbeth; Das, Krishna ULg; Siebert, Ursula et al

in Organohalogen Compounds (2008), 70

The objective of the present study was to investigate the levels and profiles of PCBs, PBDEs and their hydroxylated metabolites in blood of free-ranging harbour seals in order to elucidate the metabolism ... [more ▼]

The objective of the present study was to investigate the levels and profiles of PCBs, PBDEs and their hydroxylated metabolites in blood of free-ranging harbour seals in order to elucidate the metabolism of PCBs and PBDEs. [less ▲]

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See detailPCDD, PCDF AND PCB DETERMINATION IN DOLPHINS REVEALS A WORLD HOTSPOT FOR PCBS IN GUANABARA BAY, BRAZIL
Dorneles, Paulo; Lailson-Brito, José; Eppe, Gauthier ULg et al

in Organohalogen Compounds (2008), 70

The main objective of the present study was to determine the current concentrations of PCDDs, PCDFs and PCBs in dolphins from a region of high industrialization and urbanization in the Southern Hemisphere ... [more ▼]

The main objective of the present study was to determine the current concentrations of PCDDs, PCDFs and PCBs in dolphins from a region of high industrialization and urbanization in the Southern Hemisphere. Since most of these compounds biomagnify in food chains and changes in ratios of stable isotopes of nitrogen (15N/14N) have been used to elucidate trophic relationships 7, measurements of these isotopes have been carried out in marine tucuxi dolphins and their prey in Guanabara Bay. Stable isotopes were measured, firstly, to quantitatively assess the trophic level of the dolphin, and, secondly, to provide information for future human risk assessment investigations related to fish consumption [less ▲]

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See detailPCDD/F and non-ortho PCB body burden of the general population in Wallonia, Belgium: impact of different sources of environmental pollution
Fierens, S.; Mairesse, Hélène; Focant, Jean-François ULg et al

in Organohalogen Compounds (2002), 55

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See detailPCDD/Fs and dioxin-like PCBs in home-produced eggs from Belgium: levels, contamination sources and health risks.
Van Overmeire, I.; Waegeneers, N.; Sioen, I. et al

in Science of the Total Environment (2009), 407(15), 4419-29

This paper discusses the dioxin TEQ levels as determined by the chemically activated luciferase gene expression assay (CALUX) and by HRGC-HRMS in eggs, soils, faeces and kitchen waste samples obtained in ... [more ▼]

This paper discusses the dioxin TEQ levels as determined by the chemically activated luciferase gene expression assay (CALUX) and by HRGC-HRMS in eggs, soils, faeces and kitchen waste samples obtained in the CONTEGG study. The samples were collected in each Belgian province at private homes and in small gardens where chickens are held. The CALUX levels for eggs sampled in autumn were higher than the levels in eggs obtained at the same locations in spring (median values of 5.86 and 4.08 pg CALUX TEQ/g fat, respectively). The total WHO-TEQ levels in eggs, determined by HRGC-HRMS, ranged from 3.29 to 95.35 pg TEQ/g fat in autumn and from 1.50 to 64.79 pg TEQ/g fat in spring. In the soils on which the chickens forage, levels of 2.51-11.35 pg I-TEQ/g in autumn and 2.00-7.86 pg I-TEQ/g in spring were found. The congener pattern of PCDD/Fs in the eggs, soils and faeces was dominated by OCDD, in addition to 1,2,3,4,6,7,8-HeptaCDD, OCDF and 1,2,3,4,6,7,8-HeptaCDF. The predominant dioxin-like PCBs were PCB118, PCB 105 and PCB 156. The dioxin-like PCBs contributed on average 47%, 14% and 20% to the total WHO-TEQ in eggs, soils and faeces, respectively. Kitchen waste samples were very low-contaminated with dioxin-like compounds. The present results showed a good agreement between egg and soil TEQ levels for PCDD/Fs but not for dioxin-like PCBs. This study showed that current soil levels found in some private gardens do not lead to egg levels below the current EU maximal level of 6 pg total TEQ/g fat for dioxins and dioxin-like PCBs. The consumers of the analysed eggs attained 5-79% of the tolerable weekly intake (TWI) of 14 pg TEQ/kg bw for dioxins and dioxin-like PCBs by exposure to their home-produced eggs only. [less ▲]

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See detailpCO2 - del 13C POC relationships in surface waters of the Gulf of Biscay.
Dauby, Patrick ULg; Frankignoulle, Michel

Poster (1997, September)

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See detailpCO2 - del13CPOC relationships in srface waters of the Gulf of Biscay.
Dauby, Patrick ULg; Frankignoulle, Michel

Poster (2000, February)

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See detailpCO2 distribution of surface water in the English Channel
Frankignoulle, Michel; Bourge, Isabelle; Dauby, Patrick ULg et al

Poster (1994, October)

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See detailpCO2 distribution of surface water in the English Channel
Frankignoulle, Michel; Bourge, Isabelle; Canon, Christine et al

Conference (1994, May)

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See detailpCO2 dynamics and related airice CO2 fluxes during sea-ice growth and decay in an ice-tank experiment
Delille, Bruno ULg; Thomas, D. N.; Dieckmann, Gerhard et al

Poster (2010, June)

Detailed reference viewed: 12 (0 ULg)
See detailpCO2 dynamics in the subantarctic coastal waters off the Kerguelen archipelago
Delille, Bruno ULg; Delille, D.; Frankignoulle, M.

Poster (2000, May)

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See detailpCO2 in sea ice and CO2 fluxes estimates: where do we stand today?
Tison, J.; Delille, Bruno ULg; Papakyriakou, T. N. et al

Conference (2009, December)

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See detailPCR detection of animal by-products in feeds (WP4)
Brambilla, G.; Fumiere, Olivier; Aarts, H. J. M. et al

in Stratfeed - Strategies and methods to detect and quantify mammalian tissues in feedingstuffs. (2005)

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See detailA PCR method for detection of bifidobacteria in raw milk and raw milk cheese: comparison with culture-based methods
Delcenserie, Véronique ULg; Bechoux, Nathalie ULg; China, Bernard et al

in Journal of Microbiological Methods (2005), 61(1), 55-67

Bifidobacteria are well known for their beneficial effects on health and are used as probiotics in food and pharmaceutical products. As they form one of the most important groups in both human and animal ... [more ▼]

Bifidobacteria are well known for their beneficial effects on health and are used as probiotics in food and pharmaceutical products. As they form one of the most important groups in both human and animal feces, their use as fecal indicator organisms in raw milk products has recently been proposed. Bifidobacteria species isolated in humans are different from those isolated in animals. It should therefore be possible to determine contamination origin (human or animal). A method of detecting the Bifidobacterium genus was developed by PCR targeting the hsp60 gene. The genus Bifidobacterium was identified by PCR amplification of a 217-bp hsp60 gene fragment. The degenerated primer pair specific to the Bifidobacterium genus used was tested for it specificity on 127 strains. Sensitivity was measured on artificially contaminated samples. Food can however be a difficult matrix for PCR testing since it contains PCR inhibitors. So an internal PCR control was used. An artificially created DNA fragment of 315 bp was constructed. The PCR detection method was tested on raw milk and cheese samples and compared with three culture-based methods, which comprised enrichment and isolation steps. The enrichment step used Brain Heart Infusion medium with propionic acid, iron citrate, yeast extract, supplemented with mupirocin (BHMup) or not (BH) and the isolation step used Columbia blood agar medium, supplemented with mupirocin (CMup) or not (C). The method using mupirocin at both enrichment and isolation steps and the PCR method performed from the culture in BHMup enrichment medium were shown to be the most efficient. No significant difference was observed in raw milk samples between PCR from BHMup and the culture-based method BHMup/CMup, while a significant difference was noticed between the same methods in raw milk cheese samples, which would favor using PCR. The results suggested that PCR on the hsp60 gene was convenient for a rapid detection of bifidobacteria in raw milk and raw milk cheese samples and that bifidobacteria always present throughout raw milk cheese production could be efficiently used as fecal indicators. [less ▲]

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See detailPd-Ag/SiO2 and Pd-Cu/SiO2 cogelled xerogel catalysts for selective hydrodechlorination of 1,2-dichloroethane into ethylene
Lambert, Stéphanie ULg; Ferauche, Fabrice; Brasseur, Alain et al

in CD-ROM of full texts of the 16th International Congress of Chemical and Process Engineering, CHISA (Paper A7.2, 11 p.) (2004, August 22)

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See detailPd-Ag/SiO2 and Pd-Cu/SiO2 cogelled xerogel catalysts for selective hydrodechlorination of 1,2-dichloroethane into ethylene
Lambert, Stéphanie ULg; Ferauche, Fabrice; Brasseur, Alain et al

in Catalysis Today (2005), 100(3-4), 283-289

While 1,2-dichloroethane hydrodechlorination over pure palladium mainly produces ethane, increasing silver or copper content in bimetallic catalysts results in an increase in ethylene selectivity. The ... [more ▼]

While 1,2-dichloroethane hydrodechlorination over pure palladium mainly produces ethane, increasing silver or copper content in bimetallic catalysts results in an increase in ethylene selectivity. The specific consumption rate of 1,2-dichloroethane decreases when silver or copper loading increases. The turnover frequency, that is, the number of catalytic cycle per active site (palladium atom and its surrounding silver or copper atoms) and per second, seems to be independent of surface composition of alloy particles and 1,2-dichloroethane hydrodechlorination is insensitive to the atom's nature (silver or copper). (c) 2004 Elsevier B.V. All rights reserved. [less ▲]

Detailed reference viewed: 26 (5 ULg)