| methyl ethers | A group of compounds that contain the general formula r-och3. (12 Dec 1998) |
|---|---|
| methyl green | <chemical> Used as a biological stain and for the dyeing and printing of textiles. Usually compounded with zinc chloride. Pharmacological action: rosaniline dyes. Chemical name: Benzenaminium, 4-((4-(dimethylamino)phenyl)(4-(dimethyliminio)-2,5-cyclohexadien-1-ylidene)methyl)-N,N,N-trimethyl-, dichloride (12 Dec 1998) |
| methyl green-pyronin stain | <technique> A staining method useful for identification of plasma cells which are intensely pyroninophilic; a mixture of a green and a red dye that has the property of staining highly polymerised nucleic acid (DNA) green and low molecular weight nucleic acids (RNA) red. See: Unna-Pappenheim stain. (05 Mar 2000) |
| methyl group | A -CH3 group on a larger molecule. A carbon which is single-bonded to three hydrogens, and has one free bond to the rest of the molecule. (09 Oct 1997) |
| methyl hydroxybenzoate | Methylp-hydroxybenzoate;an antifungal preservative. Synonym: methyl hydroxybenzoate. (05 Mar 2000) |
| methyl isobutyl ketone | 4-methyl-2-pentanone;in high concentrations it has narcotic action; in relatively low concentrations it may be irritating to the eyes and mucous membranes. (05 Mar 2000) |
| methyl mercaptan | CH3SH;a product of the degradation of cysteine by intestinal bacteria; it is also reduced to produce methane and H2S. (05 Mar 2000) |
| methyl methacrylate | A thermoplastic material used for denture bases. (05 Mar 2000) |
| methyl methanesulfonate | <chemical> Methanesulfonic acid, methyl ester. An alkylating agent in cancer therapy that may also act as a mutagen by interfering with and causing damage to DNA. Pharmacological action: antineoplastic agent, alkylating, mutagens. Chemical name: Methanesulfonic acid, methyl ester (12 Dec 1998) |
| methyl n-butyl ketone | <chemical> 2-hexanone. An industrial solvent which causes nervous system degeneration. Synonym: mbk. Chemical name: 2-Hexanone (12 Dec 1998) |
| methyl nicotinate | Nicotinic acid methyl ester, used as rubefacient. (05 Mar 2000) |
| methyl orange | C14H14N3O3SNa;a weakly acid dye used as a pH indicator (red at 3.2, yellow at 4.4). Synonym: helianthine. (05 Mar 2000) |
| methyl parathion | <chemical> Phosphorothioic acid, o,o-dimethyl o-(4-nitrophenyl) ester. The methyl homolog of parathion. An effective, but highly toxic, organothiophosphate insecticide and cholinesterase inhibitor. Pharmacological action: cholinesterase inhibitor, insecticide, organothiophosphate. Chemical name: Phosphorothioic acid, O,O-dimethyl O-(4-nitrophenyl) ester (12 Dec 1998) |
| methyl red | C15H15N3O2;a weakly acid dye used as a pH indicator (red at 4.8, yellow at 6.0); easily reduced with loss of colour, and pH readings must be made rapidly. (05 Mar 2000) |
| methyl salicylate | Aromatic methyl ester of salicylic acid, produced synthetically or distilled from Gaultheria procumbens (family Ericaceae) or from Betula lenta (family Betulaceae). Used as a component of liniments, used externally and internally for the treatment of various forms of rheumatismit produces heat when rubbed into the skin (counterirritant). Synonym: checkerberry oil, gaultheria oil, sweet birch oil, wintergreen oil. (05 Mar 2000) |