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.
Effects of Mn2+ on citric acid production in A. niger cultures. A. niger conidia (106 conidia/ml) were inoculated into 2.0 ml of CAP medium containing different concentrations of Mn2+ in 16- by 125-mm silanized glass tubes that were positioned about 15° from horizontal against the shaker platform. The cultures were incubated at 30°C and shaken at 250 rpm. Citric acid was measured in the culture medium after 3 days of growth.
