| active site |
the part of an enzyme or antibody where the chemical reaction occurs
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| active placebo |
a placebo used in experimental tests of a drug that has noticeable side effects; "an active placebo mimics the side effects of the experimental drug"
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| active transport |
transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy
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| activity |
any specific behavior; "they avoided all recreational activity" action: the state of being active; "his sphere of activity"; "he is out of action" bodily process: an organic process that takes place in the body; "respiratory activity" (chemistry) the capacity of a substance to take part in a chemical reaction; "catalytic activity" natural process: a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity" activeness: the trait of being active; moving or acting rapidly and energetically; "the level of activity declines with age"
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| activate |
trip: put in motion or move to act; "trigger a reaction"; "actuate the circuits" make active or more active; "activate an old file" make more adsorptive; "activate a metal" aerate (sewage) so as to favor the growth of organisms that decompose organic matter make (substances) radioactive
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