IUPAC definition : 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.;
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.