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Int. J. Environ. Res. Public Health 2018, 15(4), 585;

Influence of Algae Age and Population on the Response to TiO2 Nanoparticles

School of Arts and Sciences, Gwynedd Mercy University, Gwynedd Valley, PA 19437, USA
Department of Environmental Engineering, Akdeniz University, Antalya 07058, Turkey
Department of Civil and Environmental Engineering, University of Delaware, Newark, DE 19711, USA
Author to whom correspondence should be addressed.
Received: 2 February 2018 / Revised: 21 March 2018 / Accepted: 21 March 2018 / Published: 25 March 2018
(This article belongs to the Special Issue Nano-Bio Interactions: Nanomedicine and Nanotoxicology)
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This work shows the influence of algae age (at the time of the exposure) and the initial algae population on the response of green algae Raphidocelis subcapitata to titanium dioxide nanoparticles (TiO2 NPs). The different algae age was obtained by changes in flow rate of continually stirred tank reactors prior to NP exposure. Increased algae age led to a decreased growth, variations in chlorophyll content, and an increased lipid peroxidation. Increased initial algae population (0.3−4.2 × 106 cells/mL) at a constant NP concentration (100 mg/L) caused a decline in the growth of algae. With increased initial algae population, the lipid peroxidation and chlorophyll both initially decreased and then increased. Lipid peroxidation had 4× the amount of the control at high and low initial population but, at mid-ranged initial population, had approximately half the control value. Chlorophyll a results also showed a similar trend. These results indicate that the physiological state of the algae is important for the toxicological effect of TiO2 NPs. The condition of algae and exposure regime must be considered in detail when assessing the toxicological response of NPs to algae. View Full-Text
Keywords: algae age; lipid peroxidation; chlorophyll; TiO2 nanoparticles algae age; lipid peroxidation; chlorophyll; TiO2 nanoparticles

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Metzler, D.M.; Erdem, A.; Huang, C.P. Influence of Algae Age and Population on the Response to TiO2 Nanoparticles. Int. J. Environ. Res. Public Health 2018, 15, 585.

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