Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/76294
Title: Influences of temperature and salinity on physicochemical properties and toxicity of zinc oxide nanoparticles to the marine diatom Thalassiosira pseudonana
Authors: Yung, MMN
Kwok, KWH 
Djurisic, AB
Giesy, JP
Leung, KMY
Issue Date: 2017
Source: Scientific reports, 16 2017, v. 7, no. , 3662, p. 1-9
Abstract: Climate change is predicted to result in rising average temperature of seawater with more extreme thermal events, and frequent rainfalls in some coastal regions. It is imperative to understand how naturally mediated changes in temperature and salinity can modulate toxicity of chemical contaminants to marine life. Thus, this study investigated combined effects of temperature and salinity on toxicity of zinc oxide nanoparticles (ZnO-NPs) to the marine diatom Thalassiosira pseudonana. Because ZnO-NPs formed larger aggregations and released less zinc ions (Zn2+) at greater temperature and salinity, toxicity of ZnO-NPs to T. pseudonana was less at 25 degrees C than at 10 degrees C and less at 32 than 12 PSU. However, toxicity of ZnO-NPs was significantly greater at 30 degrees C, since T. pseudonana was near its upper thermal limit. Three test compounds, ZnO, ZnO-NPs and ZnSO4, displayed different toxic potencies and resulted in different profiles of expression of genes in T. pseudonana. This indicated that ZnO-NPs caused toxicity via different pathways compared to ZnSO4. Mechanisms of toxic action of the three compounds were also dependent on temperature and salinity. These results provide insights into molecular mechanisms underlying the responses of the diatom to ZnO-NPs and Zn2+ under various regimes of temperature and salinity.
Publisher: Nature Publishing Group
Journal: Scientific reports 
ISSN: 2045-2322
EISSN: 2045-2322
DOI: 10.1038/s41598-017-03889-1
Rights: Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
© The Author(s) 2017
The following publication Yung, M.M.N., Kwok, K.W.H., Djurišić, A.B. et al. Influences of temperature and salinity on physicochemical properties and toxicity of zinc oxide nanoparticles to the marine diatom Thalassiosira pseudonana . Sci Rep 7, 3662 (2017) is available at https://dx.doi.org/10.1038/s41598-017-03889-1
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