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biologic activity |
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biologic activity, the inherent capacity of a substance, such as a drug or toxin, to alter one or more chemical or physiologic functions of a cell, tissue, organ, or organism. The biologic activity of a substance is determined not only by the substance's physical and chemical nature but also by its concentration and the duration of cellular exposure to it. Biologic activity may reflect a "domino effect," in which the alteration of one function disrupts the normal activity of one or more other functions. 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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Since metabolic processes that take place in cells produce isotopically light carbon, a high concentration of carbon-12 is often a sign that the carbon was generated by biologic activity, Whitehouse adds. The recombinant form of platelet growth factor has a biologic activity that is much like that produced naturally by the body. Glucocorticoids are drugs that have biologic activity similar to the hormones made in the adrenal glands. |
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