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The effect of engineered iron nanoparticles on growth and metabolic status of marine microalgae cultures.
- Source :
-
The Science of the total environment [Sci Total Environ] 2012 Nov 15; Vol. 439, pp. 8-17. Date of Electronic Publication: 2012 Oct 09. - Publication Year :
- 2012
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Abstract
- Synthetic zero-valent nano-iron (nZVI) compounds are finding numerous applications in environmental remediation owing to their high chemical reactivity and versatile catalytic properties. Studies were carried out to assess the effects of three types of industrially relevant engineered nZVI on phytoplankton growth, cellular micromorphology and metabolic status. Three marine microalgae (Pavlova lutheri, Isochrysis galbana and Tetraselmis suecica) were grown on culture medium fortified with the nano-Fe compounds for 23 days and subsequent alterations in their growth rate, size distribution, lipid profiles and cellular ultrastructure were assessed. The added nano Fe concentrations were either equimolar with the EDTA-Fe conventionally added to the generic f/2 medium (i.e. 1.17 × 10(-5)M), or factor 10 lower and higher, respectively. We provide evidence for the: (1) broad size distribution of nZVI particles when added to the nutrient rich f/2 media with the higher relative percentage of the smallest particles with the coated forms; (2) normal algal growth in the presence of all three types of nZVIs with standard growth rates, cellular morphology and lipid content comparable or improved when compared to algae grown on f/2 with EDTA-Fe; (3) sustained algal growth and normal physiology at nZVI levels 10 fold below that in f/2, indicating preference to nanoparticles over EDTA-Fe; (4) increased total cellular lipid content in T. suecica grown on media enriched with uncoated nZVI25, and in P. lutheri with inorganically coated nZVI(powder), when compared at equimolar exposures; (5) significant change in fatty acid composition complementing the nZVI(powder)-mediated increase in lipid content of P. lutheri; (6) a putative NP uptake mechanism is proposed for I. galbana via secretion of an extracellular matrix that binds nZVIs which then become bioavailable via phagocytotic membrane processes.<br /> (Copyright © 2012 Elsevier B.V. All rights reserved.)
- Subjects :
- Fatty Acids metabolism
Lipid Metabolism drug effects
Marine Biology
Particle Size
Research Design
Seawater chemistry
Surface Properties
Iron Compounds chemistry
Iron Compounds pharmacology
Microalgae drug effects
Microalgae growth & development
Microalgae metabolism
Nanoparticles chemistry
Water Pollutants, Chemical chemistry
Water Pollutants, Chemical pharmacology
Subjects
Details
- Language :
- English
- ISSN :
- 1879-1026
- Volume :
- 439
- Database :
- MEDLINE
- Journal :
- The Science of the total environment
- Publication Type :
- Academic Journal
- Accession number :
- 23059967
- Full Text :
- https://doi.org/10.1016/j.scitotenv.2012.09.010