An official website of the United States government
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.
Chemist Noreen Mahoney performs analysis of aflatoxin from a petri dish (center) containing Tulare walnuts inoculated with Aspergillus flavus. The dish in the foreground (green) contains no walnut tissue and displays extensive growth of A. flavus.