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.
TB (Tuberculosis) under a microscope! 1  TB can infect any part of the body. 2  TB can remain in a latent state for periods of time. 3  Coughing and sneezing are the most common cause of TB transmission.  Typically, TB targets the lungs and 1  throat. During the latency period, the TB-resistant host is not contagious.