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activity

Pronunciation: ak-tiv′i-tē

Definition:

  1. electroencephalography The presence of neurogenic electrical energy.
  2. physical chemistry an ideal concentration for which the law of mass action will apply perfectly; the ratio of the activity to the true concentration is the activity coefficient (γ), which becomes 1.00 at infinite dilution.
  3. For enzymes, the amount of substrate consumed (or product formed) in a given time under given conditions; turnover number.
  4. The number of nuclear transformations (disintegrations) in a given quantity of a material per unit time. Units: curie (Ci), millicurie (mCi), becquerel (Bq), megabecquerel (MBq).

See Also: radioactivity

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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