MEDICAL DICTIONARY
Liquid nitrogen: Nitrogen in a liquid state. Liquid nitrogen is supercool -- about 200 degrees Celsius (320 degrees Fahrenheit ) below zero -- and is used for cryopreservation , cryosurgery , and cryomedicine.
Liquid nitrogen is invaluable for preserving blood and bone marrow cells, sperm , ova , early embryos, and, in the microbiology laboratory, a variety of microorganisms ( bacteria , fungi , etc). In cryosurgery, a super-chilled scalpel may be used to remove cancer tissue .
In dermatology, liquid nitrogen is commonly used to freeze benign growths, precancers, and skin cancers. The liquid nitrogen is usually applied by a spray bottle (canister) or a cotton swab. It is the thawing process that damages the cells. Liquid nitrogen is also known as LN2.
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