Figure 19.
pH control, using a “hydrocolloid tablet” impregnated with polytryptophan, activated by a square wave current [51]. Figure authorized by the editor.
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.