Figure 3.
Photographs of the abbreviation of Zhengzhou University, “ZZU”, which was composed of the SA (the first letter “Z”), SA/PEI (SP) (the second letter “Z”) and SPS (the third letter “U”) hydrogel spheres.
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.