[Photooptic response of blood plasma to low intensity red light]

Photooptical response, both of the whole blood and of its non-pigmented fraction-plasma to the low-intensity red light is investigated. For the case of the blood irradiation in vitro it is shown that the mechanism of the low-intensity red light effect on the blood is not directly associated with the pigmented molecular complexes concentrated in erythrocytes. Thus the effect of the low-intensity red light on living organisms includes the mechanisms not using light absorption by the specialized macromolecule--photoreceptor as a primary photophysical action.