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Glossary

Macrophage

A large phagocytic cell found in the lung tissues that helps defend the body against viruses, bacteria, and other foreign intruders, generally by engulfing them.

Make up

Air which enters the house, either intended or not, to replace the air removed through exhaust and dilution.

Make-up Air

Air brought into a building from the outdoors through the ventilation system, which has not been previously circulated through the system.

Management

Operation of an IAQ program-including personnel and budgeting decisions, monitoring and feedback, legislative initiatives, internal information flows, and enforcement of State requirements.

MCS

Multiple Chemical Sensitivity. A term used by some people to refer to a condition in which a person is considered to be sensitive to a number of chemicals at very low concentrations. There are a number of views about the existence, potential causes, and possible remedial actions regarding this phenomenon.

Medulla Oblongata

2nd division of the C.N.S.

Metabolism

In toxicology, refers to the biochemical changes that a chemical undergoes in the body.

mg/L (ppm)

Milligrams per liter (parts per million). For practical purposes mg/L is assumed to be equal to ppm.

Microbial/Microbiological

Microscopic forms of life.

Microbiological Contamination

Infection or pollution by microscopic organisms.

Microbiologicals

Agents derived from or that are living organisms (e.g., viruses, bacteria, fungi, and mammal and bird antigens) that can be inhaled and can cause many types of health effects including allergic reactions, respiratory disorders, hypersensitivity diseases, and infectious diseases. Also referred to as microbiologicals or microbials.

Micrographia

Characterized by very small, cramped handwriting.

Mid-brain

4th division of the C.N.S.

Mists

Mist is a term loosely applied to any dispersion of liquid particles, many of which are large enough to be individually visible without visual aid.

Mold

Growth produced by any of a large group of fungi which has a cottony or furry appearance.

MSDS

Material Safety Data Sheet

Mucus

Mucus droplets are secreted by specialized cells in the respiratory system, mucus currents, swept by cilia remove foreign particles from the trachea.

Multiple Chemical Sensitivity (MCS)

A term used by some people to refer to a condition in which a person is considered to be sensitive to a number of chemicals at very low concentrations. There are a number of views about the existence, potential causes, and possible remedial actions regarding this phenomenon.

Mutagens

Substances that induce a permanent change in the genetic material.

Mutism

 

Unable to speak, inarticulate; inability or refusal to speak.

Mycotoxins

 

Metabolites produced by fungi that have a broad spectrum of toxic effects ranging from mild acute toxicity to potent carcinogenicity.

Myoclonus

Very brief, involuntary, random muscular contractions. Myoclus can occur spontaneously at rest, in response to sensory stimuli, or with voluntary movements.