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N.A.
Abbreviation for numeric aperture.
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N.A.D.
Abbreviation for no appreciable disease; nothing abnormal detected (British).
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N.K.
Abbreviation for Nomenklatur Kommission.
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N/2
Symbol for seminormal.
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n0
Abbreviation for Loschmidt number.
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N10-formyltetrahydrofolate
A formyl derivative of tetrahydrofolate that serves as a one-carbon source in metabolism.
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N4-acetylsulfanilamide
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N5, N10-methylenetetrahydrofolate reductase
An enzyme that converts N5,N10-methylenetetrahydrofolate to N5,N10-methenyltetrahydrofolate using NADP+; a deficiency of this enzyme results in an accumulation of l-homocysteine and severe neurological disturbances.
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N5,N10-methenyltetrahydrofolate
A one-carbon derivative of tetrahydrofolate; used in purine biosynthesis.
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N5-methyltetrahydrofolate
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Na
Na: The chemical symbol for sodium. From natrium, a
synonym for sodium. Sodium chloride (ordinary salt) is NaCl.
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nabilone
A synthetic cannabinoid used to treat nausea and vomiting associated with cancer chemotherapy.
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nabothian cyst
a retention cyst that develops when a mucous gland of the cervix uteri is obstructed; of no pathologic significance.
Alternate names: nabothian follicle
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nacreous
Lustrous, like mother-of-pearl; descriptive term for bacterial colonies.
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nacreous ichthyosis
a variant of ichthyosis characterized by dry pearly scales.
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NAD
Abbreviation for nicotinamide adenine dinucleotide (oxidized form).
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NAD(P)+ nucleosidase
An enzyme that catalyzes the hydrolysis of either NAD+ or NADP+ to release free nicotinamide and adenosine diphosphoribose phosphate.
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NAD+
Abbreviation for nicotinamide adenine dinucleotide (oxidized form).
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NAD+ nucleosidase
an enzyme that catalyes hydrolysis of NAD+ to nicotinamide and adenosine diphosphoribose.
Alternate names: NADase
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NAD+ pyrophosphorylase
an enzyme that participates in synthesis of NAD+; it reacts nicotinamide mononucleotide with ATP to produce NAD+ and pyrophosphate; it also acts on nicotinate mononucleotide.
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NAD+ synthetase
an enzyme that catalyzes the reaction of ATP, l-glutamine, and nicotinate adenine dinucleotide to form NAD+, ADP, and l-glutamate.
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NADH
Abbreviation for nicotinamide adenine dinucleotide (reduced form).
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NADH dehydrogenase
an iron-sulfur–containing flavoprotein reversibly oxidizing NADH to NAD+; an inherited deficiency of this complex results in overwhelming acidosis.
Alternate names: cytochrome c reductase
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NADH dehydrogenase (quinone)
an enzyme oxidizing NADH with quinones (menaquinone) as acceptors.
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NADH-hydroxylamine reductase
an enzyme catalyzing the reaction of hydroxylamine and NADH to form ammonia, NAD+, and water; used in a number of clinical assays.
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nadir
The lowest value of blood counts after chemotherapy.
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NADP
Abbreviation for nicotinamide adenine dinucleotide phosphate (oxidized form).
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NADP+
Abbreviation for nicotinamide adenine dinucleotide phosphate (oxidized form).
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NADPH
Abbreviation for nicotinamide adenine dinucleotide phosphate (reduced form).
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NADPH dehydrogenase
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