Exposures that are more common among the cases may be considered as possible risk factors for the disease.Ī unique number assigned to a substance or mixture by the American Chemical Society Abstracts Service External. The true risk might be lower.Ī medical or epidemiologic evaluation of one person or a small group of people to gather information about specific health conditions and past exposures.Ī study that compares exposures of people who have a disease or condition (cases) with people who do not have the disease or condition (controls). Some substances build up in the body because they are stored in fat or bone or because they leave the body very slowly.Īny one of a group of diseases that occur when cells in the body become abnormal and grow or multiply out of control.Ī theoretical risk for getting cancer if exposed to a substance every day for 70 years (a lifetime exposure). The total amount of a substance in the body. Some of these plants and animals might be sources of food, clothing, or medicines for people. Testing of persons to find out whether a change in a body function might have occurred because of exposure to a hazardous substance. The transfer of substances from the environment to plants, animals, and humans. A blood test for lead is an example of biologic monitoring. Measuring hazardous substances in biologic materials (such as blood, hair, urine, or breath) to determine whether exposure has occurred. Īn average or expected amount of a substance or radioactive material in a specific environment, or typical amounts of substances that occur naturally in an environment.ĭecomposition or breakdown of a substance through the action of microorganisms (such as bacteria or fungi) or other natural physical processes (such as sunlight).Ī study that uses (a) biomedical testing or (b) the measurement of a substance, its metabolite, or another marker of exposure in human body fluids or tissues to confirm human exposure to a hazardous substance. For example, if the analyte is mercury, the laboratory test will determine the amount of mercury in the sample.Ī study that evaluates the association between exposure to hazardous substances and disease by testing scientific hypotheses.Ī biologic response to exposure to multiple substances that is less than would be expected if the known effects of the individual substances were added together.
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A chemical for which a sample (such as water, air, or blood) is tested in a laboratory. Ī change in body function or cell structure that might lead to disease or health problems Ī biologic response to exposure to multiple substances that equals the sum of responses of all the individual substances added together. Ĭontact with a substance that occurs once or for only a short time (up to 14 days). For a person or an animal, absorption is the process of a substance getting into the body through the eyes, skin, stomach, intestines, or lungs. If you have questions or comments, call ATSDR’s toll-free telephone number, 1-800-CDC-INFO (232-4636).Ī B C | D E F | G H I | J K L | M N O | P Q R S | T U V | W X Y Z It is not a complete dictionary of environmental health terms. This glossary defines words used by ATSDR in communications with the public. Environmental Protection Agency (EPA), which is the federal agency that develops and enforces environmental laws to protect the environment and human health. ATSDR is not a regulatory agency, unlike the U.S.
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ATSDR’s mission is to serve the public by using the best science, taking responsive public health actions, and providing trusted health information to prevent harmful exposures and diseases related to toxic substances. Half-Life 's Marine models were used as placeholders in the early screenshots of Opposing Force.The Agency for Toxic Substances and Disease Registry (ATSDR) is a federal public health agency with headquarters in Atlanta, Georgia, and 10 regional offices in the United States.
Hazardous environments half life movie#
Lee Ermey) from the movie Full Metal Jacket.
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The character was cut, but his head model was used a generic HECU Marine in the final game.