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The Nif regulon is a set of seven operons used to regulate nitrogen fixation in the coliform bacterium Klebsiella pneumoniae under anaerobic and microaerophilic conditions. [1] It includes 17 nif genes , and is situated between the his and the Shi-A operon of the bacterium.
The nif genes are genes encoding enzymes involved in the fixation of atmospheric nitrogen into a form of nitrogen available to living organisms. The primary enzyme encoded by the nif genes is the nitrogenase complex which is in charge of converting atmospheric nitrogen (N 2) to other nitrogen forms such as ammonia which the organism can use for various purposes.
National Ignition Facility, a US experimental fusion facility at Lawrence Livermore National Laboratory; National Immigration Forum, a pro-immigrant advocacy non-profit organization based in Washington, DC