ABSTRACT
This chapter aims to connect all events and discuss the possible chain leading from photon absorption to increasing of cellular multiplication (transduction chain). Cells may react otherwise to monochromatic light, to which they are not evolutionally adapted as opposed to the white light, to which they have been adapated evolutionally. Based on scanty experimental data available today, one can imagine the following scheme of interaction between low-intensity monochromatic visible light and a cell. In experiments with microorganisms, we established seasonal variations of possible growth stimulation by light. The dependence of cellular photosensitivity on such a factor like amount of nutrients available is also consistent above hypothesis about growth limits (and connected with that, photostimulation effect limits). It has been found that starving cells are more photosensitive than well-fed ones, the extent of light-inducible respiration varying with the degree of starvation.
