Cherchi, Carla and Gu, April Z.. (2010) Impact of Titanium Dioxide Nanomaterials on Nitrogen Fixation Rate and Intracellular Nitrogen Storage inAnabaena variabilis. Environmental Science & Technology, 44 (21). p. 8302. ISSN 0013-936XFull text not available from this repository.
This study comprehensively investigated the impact of titanium dioxide nanomaterials (nTiO2) exposure on cell growth, nitrogen fixation activity, and nitrogen storage dynamics in the primary producer cyanobacteria Anabaena variabilis at various dose concentrations and exposure time lengths. The results indicated that both growth rate (EC50-96 h of 0.62 mgTiO2/L) and nitrogen fixation activity (EC50-96 h of 0.4 mgTiO2/L) were inhibited by nTiO2 exposure. The Hom’s law (CnTm) was used as inactivation model to predict the concentration- and time-dependent inhibition of growth and nitrogen fixation activity. The kinetic parameters determined suggested that the time of exposure has a greater influence than the nTiO2 concentration in toxicity. We observed, for the first time, that nTiO2 induced a dose (concentration and time)-dependent increase in both the occurrence and intracellular levels of the nitrogen-rich cyanophycin grana proteins (CGPs). The results implied that CGPs may play an important role in the stress response mechanisms of nTiO2 exposure and can serve as a toxicity assessment endpoint indicator. This study demonstrated that nitrogen-fixing activity could be hampered by the release of nTiO2 in aquatic environments; therefore it potentially impacts important biogeochemical processes, such as carbon and nitrogen cycling.
|InterNano Taxonomy:||Nanoscale Objects and Nanostructured Materials > Nanostructured Materials
Environment, Health, and Safety > Environmental Impact
Environment, Health, and Safety
Areas of Application > Environment and Civil Infrastructure
|Collections:||Nanomanufacturing Research Collection > Nanomanufacturing Nanoscale Science and Engineering Centers > Center for High-rate Nanomanufacturing
Nanomanufacturing Research Collection
|Depositing User:||Robert Stevens|
|Date Deposited:||22 Jun 2011 18:46|
|Last Modified:||19 Sep 2011 21:16|
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