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. 2009 Feb 9;6:4. doi: 10.1186/1743-8977-6-4

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Copyright © 2009 Guo et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Protein carbonyl concentrations in A549 cells after 25 hours of exposure to (A) carbon black nanoparticles alone, (B) carbon black nanoparticles and Fe₂O₃nanoparticles, (C) Fe₂O₃nanoparticles alone, and (D) Fe₂O₃nanoparticles and carbon black nanoparticles. Numbers within the co-exposure graphs denote doses of the two materials. "Nanomaterial dose" refers to the concentration of the nanoparticles in the cell culture medium. Values given are means ± SD (*p < 0.05 relative to control cell population).