title: Cell-wall-dependent effect of carboxyl-CdSe/ZnS quantum dots on lead and copper availability to green microalgae.
abstract: The present study examines the effect of carboxyl-CdSe/ZnS quantum dots (QDs) on Cu and Pb availability to microalgae with different cell wall characteristics: Chlorella kesslerii possessing a cellulosic cell wall and two strains of Chlamydomonas reinhardtii, a wall-less and a walled strain containing glycoproteins as the main cell wall component. Results demonstrated that QDs decreased Pb and Cu intracellular contents ({Cu}(int) and {Pb}(int)) in walled strains by a factor of 2.5 and 2, respectively, as expected by the decrease of about 70% and 40% in the dissolved Cu and Pb concentrations. QDs increased {Cu}(int) and {Pb}(int) in wall-less strain by a factor of 4 and 3.5. These observations were consistent with the observed association of QDs to the wall-less C. reinhardtii, and lack of association to walled algal strains. Suwannee River humic acid did not influence metal association to QDs, but decreased {Cu}(int) and {Pb}(int) in all microalgae.
authors.affiliation: Aquatic Biogeochemistry and Ecotoxicology, Institute F-A Forel, Faculty of Sciences, University of Geneva, 10 route de Suisse, 1290 Versoix, Switzerland.
authors.forename: Isabelle A M
authors.initials: IA
authors.lastname: Worms
authors.forename: Jonathan
authors.initials: J
authors.lastname: Boltzman
authors.forename: Miguel
authors.initials: M
authors.lastname: Garcia
authors.forename: Vera I
authors.initials: VI
authors.lastname: Slaveykova
mesh_terms: D002104:Cadmium / Q000737:chemistry / Q000378:metabolism; D002473:Cell Wall / Q000378:metabolism*; D016825:Chlamydomonas reinhardtii / Q000378:metabolism; D002708:Chlorella / Q000378:metabolism; D003300:Copper / Q000737:chemistry / Q000378:metabolism*; D007854:Lead / Q000737:chemistry / Q000378:metabolism*; D058086:Microalgae / Q000378:metabolism*; D045663:Quantum Dots; D012643:Selenium / Q000737:chemistry; D013455:Sulfur / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism*; D015032:Zinc / Q000737:chemistry
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium; D007854:Lead; D013455:Sulfur; D003300:Copper; D012643:Selenium; D015032:Zinc