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reaction |
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reaction 1. opposition to change, esp political change, or a desire to return to a former condition or system 2. a response indicating a person's feelings or emotional attitude 3. Med a. any effect produced by the action of a drug, esp an adverse effect b. any effect produced by a substance (allergen) to which a person is allergic the simultaneous equal and opposite force that acts on a body whenever it exerts a force on another body 4. short for chemical reaction, nuclear reaction reaction [rē′ak·shən] (control systems) (mechanics) The equal and opposite force which results when a force is exerted on a body, according to Newton's third law of motion. (nuclear physics) How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Because a delayed hypersensitivity reaction to a previously sensitized antigen occurs, patients who had not been previously vaccinated with bacille Calmette-Guerin (BCG) were not eligible for this study. The immunopathogenesis of food allergies may be governed by more than one immunologic mechanism, including immediate manifestations mediated by IgE; inflammatory reactions caused by immune complexes, lectins, and superantigens; and delayed hypersensitivity reactions associated with specific T lymphocytes (Helm and Burks 2000). Delayed hypersensitivity reaction to topical aminoglycosides in patients undergoing middle ear surgery. |
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