Ammonia and the Haber process. Ammonia. Ammonia (NH3) is a compound [compound: A compound is a substance formed by the chemical union (involving bond formation) of two or more elements. ] of nitrogen and hydrogen. It is a colourless gas with a choking smell, and a weak alkali which is very soluble in water.
Latent tuberculosis infection (LTBI) is a condition in which a person is infected with M. tuberculosis, but does not currently have active tuberculosis disease.
Latent tuberculosis infection (LTBI) is a condition in which a person is infected with Mycobacterium tuberculosis, but does not currently have active tuberculosis disease. An estimated 10 to 15 million persons in the United States have LTBI.