ABSTRACT

The inhibitive effects of visible, especially blue and near UV light on cellular growth and division have been studied for both procaryotic and eucaryotic microorganisms. The literature available to us contains no data that the growth of these particular strains may be stimulated by the action of low-intensity monochromatic visible light. The growth of eucaryotic microorganisms can be accelerated also by means of irradiation with monochromatic visible light. Literature available to us contained no data about the action of lower-power laser light on proliferative activity of plateau phase cells. At the same time irradiation with monochromatic visible light has been found to be inhibitive or indifferent. A short-focus positive lens was used to expand a beam from a light source to a diameter of 24 mm, equal to monolayer of cells. A comparison was made of the effects of simultaneous irradiation of cells with red and wide band light with the effects of separate irradiations.