Siebel - Brewing Terminology

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Maize	Indian corn.

Malting	Steeping, germinating and drying grains, particularly barley.

Maltose	A crystalline sugar C12H22O11 formed from starch by the action of amylase. It is dextrorotatory and the main source of fermentable extract in brewing.

Medium	A mixture of nutrients needed for cell growth.

Meiosis	Process of cell reproduction whereby the daughter cells have half the chromosome number of the parent cells. Sex cells are formed by meiosis. Cf. Mitosis.

Messenger RNA (mRNA)	Nucleic acid that carries instruction to a ribosome for the synthesis of a particular protein.

Metabolism	The sum of the processes concerned in the building up of protoplasm and its destruction incidental to life; the chemical changes in living cells, by which the energy is provided for the vital processes and activities and new material is assimilated to repair the waste.

Metabolism	All biochemical activities carried out by an organism to maintain life.

Micro-organisms	Microscopic forms of life such as bacteria, yeast and molds.

Microbial herbicides/pesticides	Microorganisms that are toxic to specific plants/insects. Because of their narrow host range and limited toxicity, these microorganisms may be preferable to their chemical counterparts for certain pest control applications.

Microbiology	Study of living organisms that can be seen only under a microscope.

Micron	0.001 millimeter.

Microorganism	Any organism that can be seen only with the aid of a microscope. Also called microbe.

Mildew	A thin, whitish growth produced on organic matter and on plants by fungi (as of the families Peronosporaceae).

Mineral	Any element or compound occurring naturally in the mineral kingdom as distinguished from occurrence in either the vegetable or animal kingdom.

Mineral Oil	Any oil of mineral origin as distinguished from plant and animal oils. The mineral oils include such materials as petroleum, shale oil, or oil obtained from them by distillation. They are essentially mixtures of hydrocarbons.

Mitosis	Process of cell reproduction whereby the daughter cells are identical in chromosome number to the parent cells. Cf. Meiosis.

Mold	A growth, often wooly in appearance, produced by saprophytic fungi on various forms of organic matter, especially when damp or decaying.

Molecule	Two or more atoms bound together chemically.

Mutagen	A substance that induces mutations.

Mutant	A cell that manifests new characteristics due to a change in its DNA.

Mutation	A sudden random change in the genetic material of a cell.

Mycelium	The mass of interwoven filaments of a fungus forming the vegetative portion of the thallus.

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