| methemoglobin reductase | <enzyme> An erythrocyte enzyme which catalyses the reduction of methemoglobin (ferrihemoglobin) to haemoglobin (ferrohemoglobin). Deficiency produces the inherited disease familial methemoglobinaemia. In the absence of methemoglobin, the enzyme can also reduce methylene blue. Registry number: EC 1.6.- (12 Dec 1998) |
|---|---|
| methemoglobinaemia | The presence of methemoglobin in the blood, resulting in cyanosis. A small amount of methemoglobin is present in the blood normally, but injury or toxic agents convert a larger proportion of haemoglobin into methemoglobin, which does not function reversibly as an oxygen carrier. Methemoglobinaemia may be due to a defect in the enzyme NADH methemoglobin reductase (an autosomal recessive trait) or to an abnormality in haemoglobin m (an autosomal dominant trait). (12 Dec 1998) |
| methemoglobinuria | The presence of methemoglobin in the urine. Origin: methemoglobin + G. Ouron, urine (05 Mar 2000) |
| methenamine | <chemical> An antibacterial agent most commonly used in the treatment of urinary tract infections. Its antibacterial action derives from the slow release of formaldehyde by hydrolysis at acidic pH. Pharmacological action: anti-infective agents, urinary. Chemical name: 1,3,5,7-Tetraazatricyclo(3.3.1.13,7)decane (12 Dec 1998) |
| methenamine hippurate | Hexamethylenetetramine hippurate;a urinary antiseptic. (05 Mar 2000) |
| methenamine mandelate | C14H20N4O3;a urinary antiseptic. (05 Mar 2000) |
| methenamine salicylate | Hexamethylenetetramine salicylate;a uric acid solvent and urinary antiseptic. (05 Mar 2000) |
| methenamine-silver | A hexamethylenetetramine-silver complex prepared by adding silver nitrate to methenamine; a white precipitate appears in the solution which dissolves upon shaking and is stable under refrigeration; used in various histological and histochemical staining methods. See: Gomori's methenamine-silver stain. (05 Mar 2000) |
| methene | <chemistry> See Methylene. Source: Websters Dictionary (01 Mar 1998) |
| methenolone | <chemical> A synthetic steroid that has been used for its anabolic action. Pharmacological action: anabolic steroids. Chemical name: Androst-1-en-3-one, 17-hydroxy-1-methyl-, (5alpha,17beta)- (12 Dec 1998) |
| methenyl | <chemistry> The hypothetical hydrocarbon radical CH, regarded as an essential residue of certain organic compounds. Source: Websters Dictionary (01 Mar 1998) |
| methenyltetrahydromethanopterin cyclohydrolase | <enzyme> From methanobacterium thermoautotrophicum; catalyses the energy-independent hydrolysis of 5,10-methenyl-5,6,7,8-tetrahydromethanopterin to 5-formyl-h4mpt Registry number: EC 3.5.4.27 Synonym: 5,10-methenyl-h4mpt cyclohydrolase, 5,10-mh4mpt cyclohydrolase, 5,10-methenyltetrahydromethanopterin cylohydrolase (26 Jun 1999) |
| methergoline | <chemical> A dopamine agonist and serotonin antagonist. It has been used similarly to bromocriptine as a dopamine agonist and also for migraine therapy. Pharmacological action: dopamine agonists, serotonin antagonists. Chemical name: Carbamic acid, (((8beta)-1,6-dimethylergolin-8-yl)methyl)-, phenylmethyl ester (12 Dec 1998) |
| methicillin | <drug> Penicillinase resistant penicillin antibiotic. (18 Nov 1997) |
| methicillin resistance | Non-susceptibility of a microbe to the action of methicillin, a semi-synthetic penicillin derivative. (12 Dec 1998) |