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Medical Dictionary     N
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  • N
    The number in a scientific study. Sample size. Symbol for refractive index.
  • Nägele
  • Nägele obliquity
    inclination of the fetal head in cases of flat pelvis, so that the biparietal diameter is oblique in relation to the plane of the pelvic brim, the anterior parietal bone presenting to the parturient canal.

    Alternate names: anterior asynclitism

  • Nägele pelvis
    an obliquely contracted or unilateral synostotic pelvis, marked by arrested development of one lateral half of the sacrum, usually ankylosis of the sacroiliac joint on that side, rotation of the sacrum toward the same side, and deviation of the symphysis pubis to the opposite side.
  • Nägele rule
    determination of the estimated delivery date by adding 7 days to the first day of the last normal menstrual period, counting back 3 months, and adding 1 year.
  • Nägeli
  • Nélaton catheter
    a flexible catheter of red rubber.
  • Nélaton line
    clinically obsolete term for a line drawn from the anterior superior iliac spine to the tuberosity of the ischium; normally the greater trochanter lies in this line, but in cases of iliac dislocation of the hip or fracture of the neck of the femur the trochanter is felt above the line.

    Alternate names: Roser-Nélaton line

  • Néri sign
    in hemiplegia, the knee bends spontaneously when the leg is passively extended.
  • Nε-trimethyllysine
    An amino acid residue found in a number of proteins by the action of S-adenosyl-l-methionine on l-lysyl residues; upon release by proteolysis, Nε-trimethyllysine becomes the precursor of carnitine.
  • N,N-dimethyltryptamine
    A psychotomimetic agent present in several South American snuffs (cohoba snuff) and in the leaves of Prestonia amazonica (family Apocynaceae). Effects are similar to those of LSD, but with more rapid onset, greater likelihood of a panic reaction, and a shorter duration (1–2 hours). It produces pronounced autonomic effects, including a marked increase in blood pressure.
  • N-acetylaspartate
    An acetylated derivative of aspartate found in the brain. Used as a marker in brain nuclear magnetic resonance and in neuroimaging.
  • N-acetylglucosamine
    An acetylated amino sugar that is an important moiety of glycoproteins.
  • N-acetylglutamate
    The salt of N-acetylglutamic acid. An activator of carbamoyl phosphate synthetase I during urea synthesis; this amino acid causes a configurational change in the enzyme, thus increasing its activity. The inability to synthesize N-acetylglutamate results in a defect in urea biosynthesis.
  • N-acetylneuraminic acid
    The most common form of sialic acid in mammals.
  • N-acylamino acid
    An amino acid that has an acyl group attached to its amino group, as in hippuric acid (N-benzoylglycine) or phenaceturic acid.
  • N-acylsphingosine
    A condensation product of an organic acid with sphingosine at the amino group of the latter compound.
  • n-capric acid
  • n-caproic acid
    A fatty acid found among the hydrolysis products of fat in butter, coconut oil, and some other substances.

    Alternate names: n-hexanoic acid

  • N-carbamoylglutamate
    An intermediate in the carbamoylation of ornithine to citrulline in the urea cycle; used in the treatment of patients with a deficiency of the enzyme that synthesizes N-acetylglutamate.
  • N-carboxyanhydrides
    Heterocyclic derivatives of amino acids from which polypeptides may be synthesized.
  • n-decane
    A paraffin hydrocarbon, CH3—(CH2)8—CH3.
  • N-formiminotetrahydrofolate
  • N-formylglycinamide ribotide
    An intermediate in purine biosynthesis.
  • N-formylkynurenine
    The product of the oxidative cleavage of the indole ring in l-tryptophan; the intermediate first formed in l-tryptophan catabolism.
  • N-formylmethionine
    Methionine acylated on the NH2 group by a formyl (–CHO) group. This is the starting amino acid residue for virtually all bacterial polypeptides. It is also observed in mitochondria and chloroplasts of eukaryotes.

    See Also: initiating codon

  • N-glycoside
    Misnomer for glycosyl.
  • n-heptylpenicillin
    Penicillin K.
  • N-methylcarnosine
  • N-methylhistidine
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