| methyl aldehyde | <chemical> Commonly used fixative and antibacterial agent. As a fixative it is cheap and tends to cause less denaturation of proteins than does glutaraldehyde, particularly if used in a well buffered solution (buffered formalin, formal saline). Old formaldehyde solutions usually contain cross linking contaminants and it is therefore often preferable to used a formaldehyde generating agent such as paraformaldehyde. Formalin fumes, particularly in conjunction with hydrochloric acid vapour, are potently carcinogenic. (20 Jun 2000) |
|---|---|
| methyl blue | A sulfonated triphenylrosaniline dye used as a stain for cytoplasm, collagen, and Negri bodies, and as an antiseptic. (05 Mar 2000) |
| methyl bromide | <chemical> A volatile, toxic, colourless gas or liquid that is frequently used as a fumigant, it is similar in structure to chloroform. It is known to be a powerful ozone-destroying chemical, but it is broken down by some bacteria, thereis much scientific debate on how much danger methyl bromide poses to the ozone layer. (09 Oct 1997) |
| methyl-CCNU | A nitrosourea antineoplastic agent resembling carmustine (BCNU) and lomustine (CCNU). Synonym: semustine. (05 Mar 2000) |
| methyl chloride | <chemical> A hydrocarbon used as an industrial solvent. It has been used as an aerosal propellent, as a refrigerant and as a local anaesthetic. Chemical name: Methane, chloro- (12 Dec 1998) |
| methyl chloride transferase | <enzyme> S-adenosylmethionine is methyl donor to chloride, bromide or iodide ions Registry number: EC 2.1.1.- (26 Jun 1999) |
| methyl coenzyme M methylreductase | <enzyme> Crude extracts of methanospirillum hungatii Registry number: EC 1.- Synonym: methylreductase, methyl com methylreductase (26 Jun 1999) |
| methyl coenzyme M reductase | <enzyme> Proposed EC 1.12.99.2 Registry number: EC 1.12.- Synonym: methyl com reductase, mcri gene product (26 Jun 1999) |
| methyl cysteine hydrochloride | Mecysteine hydrochloride;the methyl ester of cysteine hydrochloride; a mucolytic agent. (05 Mar 2000) |
| 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) |