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.
Appearance of filters after filtration of the TPNaq admixture; without addition of trace elements (left) and with ≈1.5 mL/100 mL of trace elements (right). A brown colour could be seen on filters that had been in contact with the admixture containing trace elements. The colour disappeared over time.
