| Activase |
tissue plasminogen activator: a thrombolytic agent (trade name Activase) that causes fibrinolysis at the site of a blood clot; used in treating acute myocardial infarction
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|---|---|
| activation |
stimulation of activity in an organism or chemical energizing: the activity of causing to have energy and be active making active and effective (as a bomb)
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| activation energy |
the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur; "catalysts are said to reduce the energy of activation during the transition phase of a reaction"
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| active |
tending to become more severe or wider in scope; "active tuberculosis" engaged in or ready for military or naval operations; "on active duty"; "the platoon is combat-ready"; "review the fighting forces" disposed to take action or effectuate change; "a director who takes an active interest in corporate operations"; "an active antagonism"; "he was active in drawing attention to their grievances" taking part in an activity; "an active member of the club"; "he was politically active"; "the participating organizations" full of activity or engaged in continuous activity; "an active seaport"; "an active bond market"; "an active account" exerting influence or producing a change or effect; "an active ingredient" in operation; "keep hope alive"; "the tradition was still alive"; "an active tradition" of the sun; characterized by a high level activity in sunspots and flares and radio emissions expressing that the subject of the sentence has the semantic function of actor: "Hemingway favors active constructions" expressing action rather than a state of being; used of verbs (e.g. `to run') and participial adjectives (e.g. `running' in `running water') active agent: chemical agent capable of activity (of e.g. volcanos) erupting or liable to erupt; "active volcanos" active voice: the voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb; "`The boy threw the ball' uses the active voice" a person devoted to the active life engaged in full-time work; "active duty"; "though past retirement age he is still active in his profession"
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| activator |
(biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription
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