UVΑ pre-irradiation to P25 titanium dioxide nanoparticles enhanced its toxicity towards freshwater algae Scenedesmus obliquus

2018 ◽  
Vol 25 (17) ◽  
pp. 16729-16742 ◽  
Author(s):  
Barsha Roy ◽  
Hemamalini Chandrasekaran ◽  
Suresh Palamadai Krishnan ◽  
Natarajan Chandrasekaran ◽  
Amitava Mukherjee
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Scenedesmus Obliquus ◽  
Freshwater Algae

Titanium dioxide nanoparticles enhance inorganic arsenic bioavailability and methylation in two freshwater algae species

2018 ◽  
Vol 238 ◽  
pp. 631-637 ◽  
Author(s):  
Zhuanxi Luo ◽  
Zhenhong Wang ◽  
Yameng Yan ◽  
Jinli Li ◽  
Changzhou Yan ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Inorganic Arsenic ◽  
Freshwater Algae

scholarly journals Effects of Titanium Dioxide Nanoparticles on Photosynthetic and Antioxidative Processes of Scenedesmus obliquus

Plants ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1748
Author(s):  
Zhou Li ◽  
Philippe Juneau ◽  
Yingli Lian ◽  
Wei Zhang ◽  
Shanquan Wang ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Green Algae ◽  
Uv Light ◽  
Titanium Dioxide Nanoparticles ◽  
Scenedesmus Obliquus ◽  
Freshwater Ecosystems ◽  
Oxygen Species ◽  
Nano Tio2 ◽  
Titanium Dioxide Nanoparticle ◽  
Cell Membrane Disruption

The effects of the photocatalytic toxicity of titanium dioxide nanoparticle (nano-TiO2) on phytoplankton are well understood. However, as UV light intensity decreases sharply with the depth of the water column, the effects of nano-TiO2 itself on deeper water phytoplankton, such as green algae, need further research. In this research, we investigated the effects of three sizes of TiO2 (10, 50 and 200 nm) on the photosynthetic and antioxidative processes of Scenedesmus obliquus in the absence of UV light. We found that 50 nm and 10 nm TiO2 (10 mg/L) inhibited growth rates and the maximal photosystem II quantum yield compared to the control in Scenedesmus obliquus. The minimal and maximal fluorescence yields, and the contents of reactive oxygen species and lipid peroxidation, increased, indicating that photosynthetic energy/electrons transferred to oxygen and induced oxidative stress in nano-TiO2-treated samples. In addition, we found that aggregations of algae and 10 nm TiO2 were present, which could induce cell membrane disruption, and vacuoles were induced to cope with nano-TiO2 stress in Scenedesmus obliquus. These results enhance our understanding of the effects of nano-TiO2 on the photosynthetic and antioxidative processes of green algae, and provide basic information for evaluating the ecotoxicity of nano-TiO2 in freshwater ecosystems.

scholarly journals Methods of determining titanium dioxide nanoparticles enhance inorganic arsenic bioavailability and methylation in two freshwater algae species

MethodsX ◽  
2018 ◽  
Vol 5 ◽  
pp. 620-625
Author(s):  
Zhuanxi Luo ◽  
Zhenhong Wang ◽  
Yameng Yan ◽  
Jinli Li ◽  
Changzhou Yan ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Inorganic Arsenic ◽  
Freshwater Algae
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