pathogen
Organism that produces disease. persistence How long a pollutant stays in the air, water, soil, or body. See also inertia.
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Chapter 11 - Risk, Toxicology, and Human Health
parts per trillion (ppt)
Number of parts of a chemical found in 1 trillion parts of a particular gas, liquid, or solid.
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parts per million (ppm)
Number of parts of a chemical found in 1 million parts of a particular gas, liquid, or solid.
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parts per billion (ppb)
Number of parts of a chemical found in 1 billion parts of a particular gas, liquid, or solid.
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Nontransmissible disease
Disease that is not caused by living organisms and does not spread from one person to another. Examples are most cancers, diabetes, cardiovascular disease, and malnutrition. Compare transmissible disease.
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mutation
Random change in DNA molecules making up genes that can yield changes in anatomy, physiology, or behavior in offspring. See mutagen.
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mutagen
Chemical or form of radiation that causes inheritable changes (mutations) in the DNA molecules in the genes found in chromosomes. See carcinogen, mutation, teratogen.
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metastasis
Spread of malignant (cancerous) cells from a tumor to other parts of the body. See cancer.
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meltdown
Melting of the core of a nuclear reactor.
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median lethal dose (LD50)
Amount of a toxic material per unit of body weight of test animals that kills half the test population in a certain time.
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