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.
PPX response to divalent cations in vitro. PPX activity was determined in the standard assay with cell extracts from A. ferrooxidans grown in the absence of copper. The indicated amounts of MgSO4 or CuSO4 were added. The enzyme activity in the absence of added metal was set at 100%.
