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  • N.A.
    Abbreviation for numeric aperture.
  • N.A.D.
    Abbreviation for no appreciable disease; nothing abnormal detected (British).
  • N.K.
    Abbreviation for Nomenklatur Kommission.
  • N/2
    Symbol for seminormal.
  • n0
    Abbreviation for Loschmidt number.
  • N10-formyltetrahydrofolate
    A formyl derivative of tetrahydrofolate that serves as a one-carbon source in metabolism.
  • N4-acetylsulfanilamide
  • 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.
  • N5,N10-methenyltetrahydrofolate
    A one-carbon derivative of tetrahydrofolate; used in purine biosynthesis.
  • N5-methyltetrahydrofolate
  • Na

    Na: The chemical symbol for sodium. From natrium, a synonym for sodium. Sodium chloride (ordinary salt) is NaCl.

  • nabilone
    A synthetic cannabinoid used to treat nausea and vomiting associated with cancer chemotherapy.
  • 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

  • nacreous
    Lustrous, like mother-of-pearl; descriptive term for bacterial colonies.
  • nacreous ichthyosis
    a variant of ichthyosis characterized by dry pearly scales.
  • NAD
    Abbreviation for nicotinamide adenine dinucleotide (oxidized form).
  • NAD(P)+ nucleosidase
    An enzyme that catalyzes the hydrolysis of either NAD+ or NADP+ to release free nicotinamide and adenosine diphosphoribose phosphate.
  • NAD+
    Abbreviation for nicotinamide adenine dinucleotide (oxidized form).
  • NAD+ nucleosidase
    an enzyme that catalyes hydrolysis of NAD+ to nicotinamide and adenosine diphosphoribose.

    Alternate names: NADase

  • 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.
  • NAD+ synthetase
    an enzyme that catalyzes the reaction of ATP, l-glutamine, and nicotinate adenine dinucleotide to form NAD+, ADP, and l-glutamate.
  • NADH
    Abbreviation for nicotinamide adenine dinucleotide (reduced form).
  • 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

  • NADH dehydrogenase (quinone)
    an enzyme oxidizing NADH with quinones (menaquinone) as acceptors.
  • 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.
  • nadir
    The lowest value of blood counts after chemotherapy.
  • NADP
    Abbreviation for nicotinamide adenine dinucleotide phosphate (oxidized form).
  • NADP+
    Abbreviation for nicotinamide adenine dinucleotide phosphate (oxidized form).
  • NADPH
    Abbreviation for nicotinamide adenine dinucleotide phosphate (reduced form).
  • NADPH dehydrogenase
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