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.
Cell viability on the surfaces of KNN piezoelectric ceramics: Calcein AM to detect live cells, propidium iodide to detect dead cells. (a) non-polarized surfaces (NPs); (b) positive surfaces (Ps) and (c) negative surfaces (Ns); (d) Cell proliferation on NPs, Ps and Ns was determined by CCK-8 assay on days 1, 4 and 7 days. The ** indicated significant difference (p < 0.01).
