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.
A person with a latent infection can still pass the virus on to others. A latent infection is a situation in which a virus is present in the body, but it remains dormant. Some infections are never fully flushed from the body and become latent.