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Far infrared light penetration of human body

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Try out PMC Labs and tell us what you think. Learn More. Penetration depth of ultraviolet, visible light and infrared radiation in biological tissue has not previously been adequately measured. Risk assessment of typical intense pulsed light and laser intensities, spectral characteristics and the subsequent chemical, physiological and psychological effects of such outputs on vital organs as consequence of inappropriate output use are examined.
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Deep in the Red: Using Infrared to Watch What Goes On in a Living Body - Scientific American

Fluorescent proteins, which are compounds that can absorb and then emit light, have become a powerful instrument in the cell biologist's toolkit—so powerful, in fact, that the discovery and development of green fluorescent proteins from jellyfish earned the Nobel Prize in Chemistry. These proteins have limitations, however: They need to be excited with the blue to orange part of the visible spectrum, at wavelengths of to nanometers. These wavelengths of light are too short to penetrate tissue very well, and so green fluorescent proteins are mainly used in test tube studies to watch cell division or to label certain cell types. But one of the Nobelists, Roger Y. The protein, after absorbing light from the far-red part of the spectrum, shines in the near-infrared, at wavelengths of around nanometers. These longer wavelengths can penetrate mammalian tissue and even pass through bone.
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Biological effects and medical applications of infrared radiation

An infrared lamp. The most powerful natural source of infrared radiation is the sun. Even in antiquity, the sun's "thermal radiation" was used to relieve a variety of complaints. By virtue of its beneficial effects, artificially generated infrared radiation therefore enjoys widespread applications in medicine and the wellness sector.
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The energy derived from light has been studied for centuries. Until recent decades, science can now prove and support the power of light on the human body! Light therapy, also known has low level light therapy LLLT or photobiomodulation, uses the application of light to produce various physiological benefits to the human body. As the complexity of electromagnetic spectrum is broad and health implications vastly differ, this review will specifically focus on red and infrared light. Before we dive into light therapy and how it relates to our health, we need to discuss the basic understanding of red and infrared light and the different classifications of infrared light.
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