mingi bioaktiivi (vitamiini, hormooni, kasvufaktori jms) kontsentratsiooni või bioaktiivsuse määramine, mõõtes selle mõju organismile või koele standardpreparaadiga võrreldes
a procedure for determining the concentration or biological activity of a substance (e.g. vitamin, hormone, plant growth factor, antibiotic) by measuring its effect on an organism or tissue compared to a standard preparation
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