Biostimulating Action ofLow‐Intensity MonochromaticVisible Light: Is it Possible?

Abstract

The quantitative studies with organisms of different complexity (HeLa cells, yeast organisms, E coli bacteria) to prove or disprove the stimulating action of low-intensity visible light are presented. The stimulation of DNA synthesis in HeLa cells was observed for four spectral intervals with maxima at near 400, 620, 680 and 760 nm. The red light stimulates the growth of yeast (Saccharomycodes ludwigii) and E coli in exponential growth phase. The action spectrum of monochromatic light on the growth of these organisms in the red region is very similar to that for HeLa cells.

Effects of low intensity laser in in vitro bacterial culture and in vivo infected wounds

“…The standardization of equipment and choice of the laser parameters employed, such as wavelength, period, frequency, intensity for tissue repair with concomitant bacterial infection, show great variation in the literature 10,12,15,[19][20][21][22][23][24] . The gallium arsenide laser was chosen to be one of most used lasers in physical therapy practice, capable of 25 .…”

“…In some countries this therapy is still viewed with some skepticism due to the publication of controversial articles, showing both beneficial and no effects [9][10][11][12] .…”

Effects of different colours in the visible region on <i>Leishmania Tropica</i>

“…[13]. Also the therapy with red (632.8 nm) laser light (stimulation of tissue regeneration) used for irradiation of the patients with trophic and indolent wounds has gained acceptance in the clinical practice [14]. The biomodulatory effect can have a positive effect on the repair of cutaneous wounds [15].…”

Effects of light wavelength and intensity on the production of ethanol bySaccharomyces cerevisiaein batch cultures

“…19 However, red LED light did not favor ethanol formation by S. cerevisiae compared with fluorescent light. Product formation such as red pigment stimulated by red light was observed in Monascus.…”