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Nanogram (ng)

A unit of weight consisting of one billionth of a gram (1 x 10-9 g).

Necrosis

Death, usually referring to cell death.

Nephrotoxin

A toxic agent or substance that inhibits, damages or destroys the cells and/or tissues of the kidneys.

Neurotoxin

A toxic agent or substance that inhibits, damages or destroys the tissues of the nervous system, especially neurons, the conducting cells of your body's central nervous system. Neurotoxic effects can include behavior changes, seizures, as well as wide range of effects, including death.

NIOSH

The National Institute for Occupational Safety and Health (NIOSH) is part of the Centers for Disease Control and Prevention (CDC) and is the only federal Institute responsible for conducting research and making recommendations for prevention of work-related illnesses and injuries. NIOSH is not a regulatory agency and therefore is not responsible for enforcing any regulations. For more information about NIOSH

NOAEL

No Observed Adverse Effect Level. The highest dose in a toxicity study at which there were no toxic or adverse effects observed.

NTP

The National Toxicology Program (NTP) is a unit of the U.S. Department of Health and Human Services that coordinates toxicology research and testing activities and provides information about potentially toxic chemicals to regulatory and research agencies and the public.