| M'Naghten rule | The classic English test of criminal responsibility (1843): "to establish a defense on the ground of insanity, it must be clearly proved that, at the time of committing the act, the party accused was laboring under such a defect of reasoning, from disease of the mind, as not to know the nature and quality of the act he was doing, or if he did know it, that he did not know he was doing what was wrong." (05 Mar 2000) |
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| m(2)G rRNA methyltransferase | <enzyme> 16s rrna-specific methyltransferase; forms m(2)g966; uses unmethylated 30s subunits as a substrate, but not free unmethylated 16s rrna Registry number: EC 2.1.1.- Synonym: m2g methyltransferase, m(2)g methyltransferase (26 Jun 1999) |
| m(5)C rRNA methyltransferase | <enzyme> 16s rrna-specific methyltransferase; forms m(5)c967; uses free rrna but not 30s subunits as substrate Registry number: EC 2.1.1.- Synonym: m5c methyltransferase, m(5)c methyltransferase (26 Jun 1999) |
| m-chloral | A polymer of chloral obtained by prolonged contact with sulfuric acid; it has properties similar to those of chloral hydrate. Synonym: metachloral, p-chloral, trichloral. (05 Mar 2000) |
| m-cone | Middle wavelength sensitive c. (green c.). (05 Mar 2000) |
| m-cresol | A local antiseptic with a higher germicidal power than phenol and less toxicity to tissues; used in disinfectants and fumigants; its acetate derivative is used as a topical antiseptic and fungicide. Synonym: metacresol. (05 Mar 2000) |
| M-CSF | macrophage-colony-stimulating factor |
| M-mode | A diagnostic ultrasound presentation of the temporal changes in echoes in which the depth of echo-producing interfaces is displayed along one axis with time (T) along the second axis; motion (M) of the interfaces toward and away from the transducer is displayed. Synonym: TM-mode. (05 Mar 2000) |
| M-protease | <enzyme> Highly alkaline resistant subtilisin-family serine protease from bacillus. Registry number: EC 3.4.21.- (26 Jun 1999) |
| m119 | Mouse _ interferon produced protein. See: cytokines. (18 Nov 1997) |
| M23 urokinase | <chemical> A bifunctional molecule with fibrinolytic and thrombin-inhibitory activities; comprised of the protease domain and kringle structure of saruplase and the c-terminal part of hirudin Pharmacological action: fibrinolytic agents, antithrombins Synonym: urokinase m23, rscu-pa-40 kda-hir (26 Jun 1999) |
| M4 protease | <enzyme> Nonhemorrhagic fibrinolytic metalloprotease from crotalus molossus molossus venom (northern blacktail rattlesnake); mw 27,000 Pharmacological action: fibrinolytic agents Registry number: EC 3.4.24.- (26 Jun 1999) |
| M5 proteinase | <enzyme> From crotalus molossus molossus (northern blacktailed rattlesnake) venom Pharmacological action: fibrinolytic agents, complement inactivators Registry number: EC 3.4.24.- (26 Jun 1999) |
| M:E ratio | The ratio of myeloid to erythroid precursors in bone marrow; normally it varies from 2:1 to 4:1; an increased ratio is found in infections, chronic myelogenous leukaemia, or erythroid hypoplasia; a decreased ratio may mean a depression of leukopoiesis or normoblastic hyperplasia depending on the overall cellularity of the bone marrow. (05 Mar 2000) |
| ma | 1. A child's word for mother. 2. [Hind] In Oriental countries, a respectful form of address given to a woman; mother. Origin: Cf. Mamma. Source: Websters Dictionary (01 Mar 1998) |