Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Emergence and development timeline of (A) the toxicological studies of ENMs in the past 20 years and (B) exposure risks and toxicity of ENMs to humans. The specific data in (B) are cited from references [29,30,68,[190], [191], [192], [193],196,199,200,202]. nTiO2, nanoscale titanium dioxide.
