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| Benign tumor |
| | A tumor that grows only at the site of origin; and does not invade adjacent tissues or metastasize. It is generally treatable. |
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| Bias |
| | Systematic error that may be introduced in sampling by selecting or encouraging one outcome over another. |
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| Bioaccumulation |
| | The build-up of a substance in a biological organism such that the level in the organism is greater than in environmental source of the substance. same as Bioconcentration. |
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| Bioactivation |
| | The metabolic process whereby a parent substance is chemically changed to a daughter substance with enhanced biological activity. |
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| Bioassay |
| | A laboratory study used to determine the ability of a substance to produce a particular biological effect. |
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| Bioavailability |
| | The physical and/or biological state of a substance rendering it capable of being absorbed into the body. |
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| Bioconcentration |
| | see Bioaccumulation |
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| Biodegradation |
| | Breakdown of a chemical into smaller less complex molecules by microorganisms in environmental media (e.g., soil, water, sediment). |
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| Biological Half-Life |
| | The time required to eliminate one-half the quantity of a substance from the body. |
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| Biomarker |
| | Indicators of events occurring in biologic systems due to a xenobiotic. The types of indicators are exposure, effects, or susceptibility. |
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| Biotransformation |
| | Conversion of a chemical from one form to another by a biological organism. |
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| Body Burden |
| | The concentration of a substance which has accumulated in the body. |
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| Bone Marrow |
| | The tissue within the internal open space of bones (e.g., shaft of long bones) in which the blood-forming elements exist. |
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| Bronchioles |
| | The very small branches of the tracheo-bronchial tree of the respiratory tract which terminate in the alveoli. |
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