A fluorometric system utilizing the single photon counting technique which records the decay of the intensity and the anisotropy of fluorescence following pulse excitation is described. Both macroscopic observations on cellular suspensions and measurements on individual cells under an optical microscope are possible. The system is so designed to permit precise evaluation of complex anisotropy decays, which is essential for studies of cells or tissues. Data are processed by a method which properly analyzes these complex decays. A preliminary study on erythrocyte membrane has confirmed the high resolution and precision of the system.
ASJC Scopus subject areas