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 TB infection and TB disease. The bacteria that cause TB is spread through the air from person to person. The TB bacteria are put into the air when a person with TB disease coughs, sneezes, speaks, or sings. People nearby may breathe in these bacteria and become infected.There are two types of TB conditions: latent TB infection and TB disease.eople with TB disease usually have symptoms and may spread TB bacteria to others. A cough lasting 3 weeks or longer is a symptom of TB disease. People with latent TB infection do not have symptoms, but may still need treatment. TB bacteria most commonly grow in the lungs, and can cause symptoms such as: