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| Hazard |
| | The inherit adverse effect of a substance. |
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| Hazard Communication Standard |
| | An OSHA standard established in 1983 requiring all employers to inform employees of the hazard of chemicals in the workplace and the steps necessary to avoid harm. |
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| Hazard Identification |
| | Characterization of the innate adverse toxic effects of an agent. |
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| Hepatic Cancer |
| | Cancer of the liver. |
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| Hepatic Necrosis |
| | Death of liver cells (hepatocytes). |
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| Hepatitis |
| | Inflammation of the liver |
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| Hepatotoxicity |
| | Toxicity of the liver and associated bile duct and gall bladder. |
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| Hepatotoxin |
| | A systemic poison whose target organ is the liver. |
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| Heritable Translocation Assay |
| | A test for mutagenicity in which exposed male fruit flies (Drosophila) or mice are bred to non-exposed females. The offspring males (F1 generation) are then bred to detect the presence of chromosomal translocations indicating this specific type of mutation. |
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| Human Dose Equivalent |
| | A calculation of the dose in humans that produces a specific effect based on the dose that produces the effect in animals. A conversion formula comparing animal to human body weight or animal to human body surface is used. |
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| Hypersensitivity |
| | A state of altered immune reactivity in which the body reacts with an exaggerated response to a foreign agent. |
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| Hypoxia |
| | A partial reduction in the oxygen concentration supplied to cells or tissues. |
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