Anneli Widenfalk

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Blood levels of ochratoxin A were determined in 406 Scandinavian blood donors (206 from Oslo, Norway, and 200 from Visby on the island of Gotland, Sweden), using an HPLC method. In connection with the blood collection, the subjects were asked to fill in a food questionnaire to obtain individual dietary information relevant to ochratoxin A exposure. The mean(More)
A freshwater sediment was exposed to the pesticides captan, glyphosate, isoproturon, and pirimicarb at environmentally relevant and high concentrations. Effects on sediment microorganisms were studied by measuring bacterial activity, fungal and total microbial biomass as community-level endpoints. At the sub-community level, microbial community structure(More)
In three microcosm experiments, we exposed microbial communities of a natural sediment to environmentally relevant concentrations of the fungicide captan, the herbicide isoproturon, and the insecticides deltamethrin and pirimicarb. Exposure concentrations were estimated negligible concentrations (NCs), maximum permissible concentrations (MPCs), and 100(More)
Solar ultraviolet radiation both degrades and alters the quality of natural organic matter as well as organic pollutants in surface waters. Still, it is only recently that this indirect influence of photochemical processes on aquatic organisms (e.g. bacteria) has received attention. We experimentally studied the photochemical degradation of three PAHs;(More)
In a microcosm study, the importance of different sources of organic matter (humic acids, sterile sediment, sediment, and a microbial extract) for the bioavailability of the hydrophobic pesticide chlorpyrifos to Chironomus riparius larvae was quantified. In the last two treatments biofilms were allowed to grow before (14)C-chlorpyrifos addition.(More)
The development and activity of microbiota in artificial sediment may have strong implications for the fate of test compounds and the outcome of toxicity tests. In this study, we compare a number of microbial variables in the artificial sediment commonly used in toxicity testing with that of natural sediments. Bacterial abundance of artificial sediment(More)
Under estuarine conditions, hydrophobic pesticides undergo physical/chemical partitioning into dissolved and particulate fractions of sediments. Our experimental study using 14C-chlorpyrifos (14C-CHPY) showed that sorptive associations of this common insecticide with particulate (>0.2 microm) and dissolved fractions (<0.2 microm) of sediments strongly(More)
Widenfalk, A. 2005. Interactions between pesticides and microorganisms in freshwater sediments – Toxic effects and implications for bioavailability. Doctoral dissertation. ISSN 1652-6880, ISBN 91-576-7022-6. In aquatic ecosystems sediment microbial communities provide many important functions, such as organic matter decomposition and by constituting a major(More)
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