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Glossary
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. NTP provides the scientific basis for programs, activities, and policies that promote health or lead to the prevention of disease. Founded in 1978, NTP plays a critical role in generating, interpreting, and sharing toxicological information about potentially hazardous substances in our environment. NTP strives to remain at the cutting edge of scientific research and the development and application of new technologies for modern toxicology and molecular biology.
The Consumer Product Information Database (CPID) is sponsored by the NTP of the National Institute of Environmental Health Sciences which is one of the National Instututes of Health (NIH).