| nitroso- | <chemistry, prefix> A prefix (also used adjectively) designating the group or radical NO, called the nitroso group, or its compounds. (29 Oct 1998) |
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| nitrosomethylurethane | <chemical> N-methyl-n-nitrosourethane. An alkylating carcinogen that produces gastrointestinal and probably lung and nervous system tumours. Pharmacological action: alkylating agents, carcinogens. Chemical name: Carbamic acid, methylnitroso-, ethyl ester (12 Dec 1998) |
| nitrosomonas | A genus of gram-negative, ellipsoidal or rod-shaped bacteria whose major source of energy and reducing power is from the oxidation of ammonia to nitrite. Its species occur in soils, oceans, lakes, rivers, and sewage disposal systems. (12 Dec 1998) |
| nitrosotransferase | <enzyme> Transfers nitroso group from nitrosamine to an amide receptor Registry number: EC 2.6.- Synonym: transnitrosoase (26 Jun 1999) |
| nitrosourea | Alkylating agent used in the treatment of many neoplasms; an example is BCNU [N,N'-Bis(2-chloroethyl)-N-nitrosourea; carmustine]. (05 Mar 2000) |
| nitrosoureas | A group of anticancer drugs that can cross the blood-brain barrier. Carmustine (bcnu) and lomustine (ccnu) are nitrosoureas. (12 Dec 1998) |