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. 2011 Jul 15;3(3):2888–2903. doi: 10.3390/cancers3032888

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© 2011 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 1. — Relative sizes of different matters. “Nano” is from the Greek word for “dwarf” and means 10⁻⁹ meters or 1 nanometer (nm). The National Nanotechnology Initiative (NNI) defines nanotechnology at dimensions of roughly 1 to 100 nm (shaded scale region). Adapted from the National Cancer Institute (http://nano.cancer.gov/learn/understanding).