An official website of the United States government
Here’s how you know
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.
... enhanced by low concentrations of magnesium and calcium ions, but inhibited by moderate to excessive amounts of calcium ions, and by heating at 56 degrees C.” Author ...