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This is when particular wavelengths of light are used. For example, wavelengths of the visible violet light, (present in sunlight, in the range of 400-420nm) activates a porphyrin (porphyrins are deeply coloured natural dyes – known to exist in red-coloured leaves and in red blood cells. They generally have a deep purple, or dark colour) in Propionibacterium acnes which damages and ultimately kills the bacteria. Or for psoriasis and eczema, where a particular ultraviolet wavelength suppresses the immune system and reduces the inflammatory response. Monochromatic infrared light emitted at about 890nm has even been shown effective through limited clinical studies, to help restore sensation and reduce pain in patients with neuropathies, and to improve circulation of non-healing ulcers, thereby increasing overall healing rate...
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Common topics in this essay:
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