US Pharmacopeia (USP)
An independent, scientific nonprofit organization focused on building trust in the supply of safe, quality medicines.
USA National Institute of Allergy and Infectious Diseases (US NIAID)
One of the 27 institutes and centers that make up the National Institutes of Health (NIH), an agency of the United States Department of Health and Human Services.
Urticaria
The eruption of red marks on the skin that are usually accompanied by itching. This condition can be caused by an allergy (e.g., to a food or drug), stress, infection, or physical agents such as heat or cold. Also known as hives.
Ultra-Low Penetration Air filter
A type of air filter that can remove from the air at least 99.999% of dust, pollen, mold, bacteria and any airborne particles with a minimum particle penetration size of 120 nanometres (ultrafine particles).
Ultraviolet Ray (UV)
Invisible energy in the wavelength range from 100 to 400 nanometers (nm).
Unidirectional flow
An airflow moving in a single direction, in a robust and uniform manner, and at sufficient speed, to reproducibly sweep particles away from the critical processing or testing area.
Uniformity
The quality or state of being the same, the quality or state of being uniform or identical.
United Nations Institute for Training and Research (UNITAR)
Dedicated training arm of the United Nations system. It provides training and capacity development activities to assist mainly developing countries with special attention to Least Developed Countries (LDCs), Small Island Developing States (SIDS) and other groups and communities who are most vulnerable