Nickel
A silver-white metallic element. Long-term exposure to nickel, such as from jewelry, can cause a form of contact dermatitis called nickel dermatitis. Exposure to nickel fumes can cause nasal cancer and lung cancer.
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- Nicotiana tabacum
A South American herb whose leaves contain 2-8% nicotine and serve as the source of smoking and smokeless tobacco and the basis of huge health problems. Nicotiana tabacum belongs to the nightshade family, which also includes potatoes, tomatoes, eggplant and red peppers. All contain nicotine. However, the concentration of nicotine in those vegetables is far […]
- Nicotine
An alkaloid (a nitrogen-containing chemical) made by the tobacco plant or produced synthetically. Nicotine has powerful pharmacologic effects (including increased heart rate, heart stroke volume, and oxygen consumption by the heart muscle), as well as powerful psychodynamic effects (such as euphoria, increased alertness, and a sense of relaxation). Nicotine is also powerfully addictive.
- Nicotinic acid
Mental disorientation, confusion, delusions and depression Death, if untreated. Pellagra, once a puzzle, was solved by Joseph Goldberger (1874-1929). Serving in the Public Health Service, Dr. Goldberger proposed that pellagra was due to a nutritional deficiency and in 1915 began experiments with Mississippi prison inmates (who “volunteered” in return for full pardons). Dr. Goldberger fed […]
- Nictitate
To wink. For example, nictitating spasm is spasm of the eyelid with continuous winking.
- Nictitating spasm
Spasm of the eyelid with continuous winking. To nictitiate is to wink. “Nictitate” and the older verb “nictate” both come from the Latin word for winking, “nictare.”