MEASUREMENTS OF ENZYMATIC ACTIVITY IN A SINGLE, INDIVIDUAL CELL IN POPULATION

摘要

A process for measuring enzymatic activity in an identified, isolated, intact, single, viable cell. Each of the viable cells is placed within individual identified locations on a carrier of a cytometer having means to measure enzymatic activity of a single viable cell placed in an identified location. The identified isolated cell is exposed to a substrate of an enzyme to be measured, and the rate of product formed or released following every exposure of the cell to same or different concentrations of the substrate is measured. The isolated cell may be exposed to a sequence of at least two different concentrations of the substrate, and for each exposure the rate of product formed or released is measured. Figure (1) is a model of intracellular conversion of a substrate to a product.