Discours de M. le Dr Baudart, médecin chef des services médicaux du Ruanda-Urundi

info:eu-repo/semantics/publishe

Isabelle Gatti de Gamond et l'origine de l'enseignement secondaire des jeunes filles en Belgique

Doctorat en sciences psychologiquesinfo:eu-repo/semantics/nonPublishe

Monitoring of freshwater toxins in European environmental waters by using novel multi-detection methods.

Monitoring the quality of freshwater is an important issue for public health. In samples were collected from several waters in France, Germany, Ireland, Italy, multitoxin detection methods previously developed: a microsphere-based liquid chromatography–tandem mass spectrometry (UPLC-MS/MS) method. cylindrospermopsin, and several analogues of anatoxin-a (ATX-a) was found in any of the environmental samples. Microcystin-LR and microcystin- In the case of ATX-a derivatives, 75% of samples contained mainlyH2-ATX-a and homoanatoxin-a were found in only 1 sample. These results confirm the ATX-a toxins in European freshwaters

Characterization of SDS-degrading Delftia acidovorans and in situ monitoring of its temporal succession in SDS-contaminated surface waters

Incomplete removal of sodium dodecyl sulfate (SDS) in wastewater treatment plants may result in SDS residues escaping and finding their way into receiving water bodies like rivers, lakes, and sea. Introduction of effective microorganisms into the aerobic treatment facilities can reduce unpleasant by-products and SDS residues. Selecting effective microorganisms for SDS treatment is a big challenge. Current study reports the isolation, identification, and in situ monitoring of an effective SDS-degrading isolate from detergent-polluted river waters. Screening was carried out by the conventional enrichment culture technique and the isolate was tentatively identified by using fatty acid methyl ester and 16S ribosomal RNA (rRNA) sequence analyses. Fatty acids produced by the isolate investigated were assumed as typical for the genus Comamonas. 16S rRNA sequence analysis also confirmed that the isolate had 95 % homology with Delftia acidovorans known as Comamonas or Pseudomonas acidovorans previously. D. acidovorans exhibited optimum growth at SDS concentration of 1 g l(-1) but tolerated up to 10 g l(-1) SDS. 87 % of 1.0 g l(-1) pure SDS was degraded after 11 days of incubation. The temporal succession of D. acidovorans in detergent-polluted river water was also monitored in situ by using Comamonas-specific fluorescein-labeled Cte probe. Being able to degrade SDS and populate in SDS-polluted surface waters, D. acidovorans isolates seem to be very helpful in elimination of SDS