title: Effects of laser ablated silver nanoparticles on Lemna minor.
abstract: The present study investigates and models the effect of laser ablated silver nanoparticles (AgNPs) on the development of the aquatic macrophyte Lemna minor. Toxic effects of five different AgNP concentrations (8, 16, 32, 96 and 128 μg L(-1)) on L. minor were recorded over seven days under simulated natural conditions. Biosorption of AgNPs by L. minor was modeled using four sorption isotherms, and the sorption behavior was found to agree most closely with the Langmuir-Freundlich model (R(2)=0.997). While toxic effects of AgNPs could be observed in all models and concentrations, the greatest increase in toxicity was in the 8-32 μg L(-1) range. Dry weight- and frond number-based inhibition experiments suggest that growth inhibition does not necessarily scale with AgNP concentration, and that slight fluctuations in inhibition rates exist over certain concentration ranges. Very close fits (R(2)=0.999) were obtained for all removal models, suggesting that the fluctuations are not caused by experimental variation. In addition, L. minor was found to be a successful bioremediation agent for AgNPs, and displayed higher removal rates for increasing AgNP doses. FT-IR spectroscopy suggests that carbonyl groups are involved in AgNP remediation.
authors: Ankara University, Department of Biology, Faculty of Science, Ankara 06100, Turkey.
authors: Esra
authors: E
authors: Üçüncü
authors: Bilkent University, UNAM-Institute of Materials Science and Nanotechnology, Turkey.
authors: Alper D
authors: AD
authors: Özkan
authors: Bilkent University, UNAM-Institute of Materials Science and Nanotechnology, Turkey.
authors: Canan
authors: C
authors: Kurşungöz
authors: Bilkent University, UNAM-Institute of Materials Science and Nanotechnology, Turkey.
authors: Zeynep E
authors: ZE
authors: Ülger
authors: Bilkent University, UNAM-Institute of Materials Science and Nanotechnology, Turkey.
authors: Tolga T
authors: TT
authors: Ölmez
authors: Gazi University, Life Sciences Application and Research Center, Ankara 06830, Turkey; Gazi University, Polatlı Science and Literature Faculty, Ankara 06900, Turkey. Electronic address: ttekinay@gmail.com.
authors: Turgay
authors: T
authors: Tekinay
authors: Bilkent University, UNAM-Institute of Materials Science and Nanotechnology, Turkey.
authors: Bülend
authors: B
authors: Ortaç
authors: Bilkent University, UNAM-Institute of Materials Science and Nanotechnology, Turkey; University of Muğla, Department of Geological Engineering, 48000 Kötekli, Muğla, Turkey; Ordu University, Faculty of Marine Sciences, 52400 Fatsa, Ordu, Turkey. Electronic address: evren_tunca@yahoo.com.
authors: Evren
authors: E
authors: Tunca
mesh_terms: D000327:Adsorption; D029064:Araceae / Q000187:drug effects*; D001673:Biodegradation, Environmental; D004785:Environmental Pollutants / Q000737:chemistry / Q000633:toxicity*; D007834:Lasers; D053768:Metal Nanoparticles / Q000737:chemistry / Q000633:toxicity* / Q000648:ultrastructure; D008954:Models, Biological; D010316:Particle Size; D012834:Silver / Q000737:chemistry / Q000633:toxicity*
chemical_list: D004785:Environmental Pollutants; D012834:Silver
keywords: Adsorption isotherm; Growth inhibition; Lemna minor; Nanoparticles; Silver; Toxicity