| nightmare disorder |
[DSM-IV] a sleep disorder of the parasomnia group, consisting of repeated episodes of nightmares that awaken the sleeper, who rapidly becomes fully oriented and alert and can vividly recall the dreams. Onset is usually in childhood or adolescence, and children often outgrow the disorder. Called also dream anxiety d.
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| nigropallidal encephalomalacia |
neurotoxicity in horses that have spent an extended period grazing on Centaurea repens or C. solstitialis, which cause necrosis of the substantia nigra and globus pallidus; characteristics include wandering around in a confused manner and rigidity of facial muscles so that the animals cannot chew and may starve to death.
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| niter paper |
paper impregnated with potassium nitrate, ignited and used as a moxa or by inhalation in asthma; called also saltpeter p.
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| nitrogen cycle |
the steps by which nitrogen is extracted from the nitrates of soil and water, incorporated as amino acids and proteins in living organisms, and ultimately reconverted to nitrates: (1) conversion of nitrogen to nitrates by bacteria; (2) the extraction of the nitrates by plants and the building of amino acids and proteins by addition of an amino group to the carbon compounds produced in photosynthesis; (3) the ingestion of plants by animals; and (4) the return of nitrogen to the soil in animal ...
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| nitrogen equilibrium |
nitrogenous equilibrium, the condition in which the body is metabolizing and excreting as much nitrogen as it is receiving in the food; cf. nitrogen balance, under balance. Called also protein e.
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