NanoParticle Ontology -- please see http://nano-ontology.org for contributors, documentation, and other information.
NanoParticle Ontology for cancer nanotechnology research Dennis G. Thomas, Rohit V. Pappu, Nathan A. Baker Journal of Biomedical Informatics Volume 44, Issue 1, February 2011, Pages 59–74 http://dx.doi.org/10.1016/j.jbi.2010.03.001