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MINERAL ACIDS

A general name given to all acids other than those of organic character.

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MICRCCOSMIC SALT

A compound phosphate of hydrogen sodium and ammonium obtained by mixing solutions of ordinary sodium phosphate and anmonium chloride.

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MARJORAM OIL

The essentia] oil of the aromatic herb Origanum majomna, containing terpineol and terpenes. It is soluble in alcohol and ether, and is used in perfumery and medicine. Its sp. gr. is o8g to opi.

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METALLIC ORGANIC COMPOUNDS

These include mercury phenyl, which is obtained by the action of sodium amalgam on bromobenzene; tin, lead, and magnesium form corresponding compounds. Other organometallic compounds are described under the respective metals, arsenic, antimony, boron, silicon, platinum, etc.

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MICROBES, or MICROORGANISMS,

are extremely minute living organisms by whose agency the processes of decay, putrefaction, many fermentations, and other chemical changes are brought about. Some of them play an important part in connection with infectious diseases and they are roughly divided into two classesviz,, aerobes, v, hieh require oxygen for their sustenance, and anaerobes, which cannot live in oxygen, and are killed by exposure thereto. The function of anaerobes would appear to be largely in the nature of hydrolysis, and that of aerobes one of oxidation.

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MALTING

The preparation of barley or other grain by germination ready for brewing.

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METALLIC CARBONYLS

Compounds of. metals with carbon monoxide, the nickel compound being Ni4. An iron compounda pale yellow, viscid liquid gis also known

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MUSCARINE

Avery poisonous base contained in toadstool, which can also be produced from choline by oxidation with strong nitric acid. Choline 11 found present in brain matter and in the bile. See Neurine.;

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MALE TERN OIL

A nearly colourless oil containing hexyl and octyl esters of tatty acids, distilled from the rhizome of Dryupteris filixmas marginalis. It has a sp. gr. of 085, is soluble in alcohol and ether, is used in medicine, and stated also to be u.sed in compounding some varieties of gin and certain other liquors.

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MANNITE or MANNITOL

eThe chief constituent of manna. It is a white, crystalline body, soluble in water and to some extent in alcohol, and can be produced by the action of sodium amalgam on the mixture of dextrose and Isevulose that results from the action of dilute sulphuri8. Chemically, it is regarded as a polyhydric alcohol derived from rnannose, the lastnamed substance being stercoisomeric with one of the glucoses comprehended in the monosaccharoses. It can be made to replace glycerol in fats. It can be distilled without appreciable decomposition, and does not ferment except under unusual conditions.

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