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Flicker spectroscopy of erythrocytes: a comparative study of several theoretical models

The theory of the frequency-domain optical flicker spectroscopy of erythrocytes is considered. The modified plane bending model of the flicker is developed. It takes into account the discrete spectrum of membrane bending modes; the influence of cell shape on the flicker spectrum; the viscosity of surrounding medium; and the distortion of the intrinsic shape of the flicker spectrum by the instrumental function of the measuring optical set-up. The results of two other (spherical) flicker models also are analyzed. The theory is compared with the flicker spectra measured from single human erythrocytes using two microphotometric techniques: the phase contrast and the backward laser light scattering.