title: Constitutive mineralization of low concentrations of the herbicide linuron by a Variovorax sp. strain.
abstract: The mineralization of the herbicide linuron at concentrations of microg and mg L(-1) was studied in liquid batch experiments with Variovorax sp. strain SRS16. The strain was highly efficient at mineralizing a range of linuron concentrations (0.002-10 mg L(-1)) with 20-60% of the added (14)C-ring-labeled linuron metabolized to (14)CO(2) within hours to days depending on the initial linuron concentration and incubation period. At mg L(-1) linuron concentrations the mineralization activity by SRS16 was inducible and a shift to constitutive mineralization activity was apparent with a reduction in the linuron concentration to microg L(-1) levels. This study revealed that strain SRS16 is a promising candidate for bioaugmentation of water or soil resources contaminated with low linuron concentrations.
authors.affiliation: Department of Geochemistry, Geological Survey of Denmark and Greenland (GEUS), Copenhagen K, Denmark. srs@geus.dk
authors.forename: Sebastian R
authors.initials: SR
authors.lastname: Sørensen
authors.forename: Allan
authors.initials: A
authors.lastname: Simonsen
authors.forename: Jens
authors.initials: J
authors.lastname: Aamand
mesh_terms: D018533:Biomass; D001711:Biotransformation; D002245:Carbon Dioxide / Q000378:metabolism; D002250:Carbon Radioisotopes / Q000378:metabolism; D042621:Comamonadaceae / Q000254:growth & development / Q000378:metabolism*; D006540:Herbicides / Q000378:metabolism*; D008044:Linuron / Q000378:metabolism*; D013194:Staining and Labeling
chemical_list: D002250:Carbon Radioisotopes; D006540:Herbicides; D008044:Linuron; D002245:Carbon Dioxide