... The LIM method allows to study the native contrastless biological objects without fluorescent probes. It also makes possible to estimate quantitatively change in the optical density, thereby providing not only qualitative but quantitative data at cell different states. ... This value, called as phase height, is the sum of optical density changes in different optical media (for example cell organelles) of the given point of cell. ... 2007 Biophysics dep., Biological fac., ...