Flow cytometry is a general method for rapidly analyzing large numbers of cells individually using light-scattering,fluorescence and absorbence measurements.Flow cytometric assays have been developed to determine both cellular characteristics such as size,membrane potential,and intracellular pH,and the levels of cellular components such as DNA,protein,surface receptors,and calcium.Measurments that reveal the distribution of these parameters in cell populations are important for biotechnology,because they de...