| N5,N10-methenyltetrahydrofolate | A one-carbon derivative of tetrahydrofolate; used in purine biosynthesis. N5,N10-methylenetetrahydrofolate reductase, an enzyme that converts N5,N10-m ethylenetetrahydrofolate to N5,N10-methyl enyltetrahydrofolate using NADP+; a deficiency of this enzyme results in an accumulation of l-homocysteine and severe neurological disturbances. (05 Mar 2000) |
|---|---|
| N5,N10-methenyltetrahydrofolic acid | An intermediate formed in the folic acid-catalyzed glycine-serine interconversion. Synonym: N5,N10-methenyltetrahydrofolic acid. (05 Mar 2000) |
| N5-methyltetrahydrofolate | An active one-carbon derivative of tetrahydrofolate that participates in the S-methylation of l-homocysteine. (05 Mar 2000) |
| N5-methyltetrahydrofolate:homocysteine methyltransferase | See: methionine synthase. (05 Mar 2000) |
| N6-acetyl-beta-lysine transaminase | <enzyme> Involved in oxidative catabolism of lysine by candida maltosa; forms 2-keto-6-acetamidocaproate Registry number: EC 2.6.1.65 Synonym: n6-acetyllysine transaminase, acl-at, n6-acetyllysine 2-oxoglutarate aminotransferase (26 Jun 1999) |
| na | The chemical symbol for sodium. From natrium, a synonym for sodium. Sodium chloride (ordinary salt) is nacl. (12 Dec 1998) |
| nabilone | (±)-3-(1,1-Dimethylheptyl-6-6ab,7,8,10,10aa-hexahydro-1-hydroxy-6,6-dimethyl-9H-dibenzo[b,d ]pyran-9-one;a synthetic cannabinoid used in the treatment of nausea and vomiting associated with cancer chemotherapy. (05 Mar 2000) |
| nabk | <botany> The edible berries of the Zizyphys Lotus, a tree of Northern Africa, and Southwestern Europe. Alternative forms: nubk] See Lotus, and Sadr. Origin: Ar. Nabiqa,nibqa. Source: Websters Dictionary (01 Mar 1998) |
| Naboth | Martin, German anatomist and physician, 1675-1721. See: nabothian cyst, follicle. (05 Mar 2000) |
| nabothian cyst | <radiology> Chronic cervicitis most likely to be inflammatory stenosis of cervical glands most likely to be retention most likely to be cyst Differential diagnosis: cystic mass of cervix, ectopic pregnancy, adenomyosis (12 Dec 1998) |
| nabothian follicle | <radiology> Chronic cervicitis most likely to be inflammatory stenosis of cervical glands most likely to be retention most likely to be cyst Differential diagnosis: cystic mass of cervix, ectopic pregnancy, adenomyosis (12 Dec 1998) |
| nac | A naturally occurring substance that is metabolised into the amino acid cysteine. Cysteine is one of the three components of the major cellular antioxidant glutathione (see), and people with HIV have decreased levels of this compound. Clinical studies of oral and intravenously administered NAC are evaluating its usefulness in decreasing HIV activity. See: Oxidative Stress. (09 Oct 1997) |
| nacre | <zoology> A pearly substance which lines the interior of many shells, and is most perfect in the mother-of-pearl. Alternative forms: nacker and naker] See Pearl, and Mother-of-pearl. Origin: F, cf. Sp. Nacara, nacar, It. Nacchera, naccaro, LL. Nacara, nacrum; of Oriental origin, cf. Ar. Nakir hollowed. Source: Websters Dictionary (01 Mar 1998) |
| nacreous | Consisting of, or resembling nacre, pearly, lustrous, like mother-of-pearl; descriptive term for bacterial colonies. Origin: Fr. Nacre, mother-of-pearl (21 Jun 2000) |
| nacreous ichthyosis | A variant of ichthyosis characterised by dry pearly scales. (05 Mar 2000) |