Biophoton
Biophotons (from the
Biological tissues typically produce an observed radiant emittance in the visible and ultraviolet frequencies ranging from 10−17 to 10−23 W/cm2 (approx 1-1000 photons/cm2/second).[1] This low level of light has a much weaker intensity than the visible light produced by bioluminescence, but biophotons are detectable above the background of thermal radiation that is emitted by tissues at their normal temperature.[2]
While detection of biophotons has been reported by several groups,
Detection and measurement
Biophotons may be detected with
The typical observed radiant emittance of biological tissues in the visible and ultraviolet frequencies ranges from 10−17 to 10−23 W/cm2 with a photon count from a few to nearly 1000 photons per cm2 in the range of 200 nm to 800 nm.[1]
Proposed physical mechanisms
Chemi-excitation via
Plants
Imaging of biophotons from leaves has been used as a method for assaying R gene responses.[9] These genes and their associated proteins are responsible for pathogen recognition and activation of defense signaling networks leading to the hypersensitive response,[20] which is one of the mechanisms of the resistance of plants to pathogen infection. It involves the generation of reactive oxygen species (ROS), which have crucial roles in signal transduction or as toxic agents leading to cell death.[21]
Biophotons have been also observed in the roots of stressed plants. In healthy cells, the concentration of ROS is minimized by a system of biological antioxidants. However, heat shock and other stresses changes the equilibrium between oxidative stress and antioxidant activity, for example, the rapid rise in temperature induces biophoton emission by ROS.[22]
Hypothesized involvement in cellular communication
In the 1920s, the Russian embryologist Alexander Gurwitsch reported "ultraweak" photon emissions from living tissues in the UV-range of the spectrum. He named them "mitogenetic rays" because his experiments convinced him that they had a stimulating effect on cell division.[23]
In the 1970s Fritz-Albert Popp and his research group at the University of Marburg (Germany) showed that the spectral distribution of the emission fell over a wide range of wavelengths, from 200 to 750 nm.[24] Popp's work on the biophoton emission's statistical properties, namely the claims on its coherence, was criticised for lack of scientific rigour.[2]
One biophoton mechanism focuses on injured cells that are under higher levels of oxidative stress, which is one source of light, and can be deemed to constitute a "distress signal" or background chemical process, but this mechanism is yet to be demonstrated.[citation needed] The difficulty of teasing out the effects of any supposed biophotons amid the other numerous chemical interactions between cells makes it difficult to devise a testable hypothesis. A 2010 review article discusses various published theories on this kind of signaling.[25]
The hypothesis of cellular communication by biophotons was highly criticised for failing to explain how could cells detect photonic signals several orders of magnitude weaker than the natural background illumination.[26]
See also
References
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- ^ Yirka B (May 2012). "Research suggests cells communicate via biophotons". Retrieved 26 January 2016.
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- ^ Joines WT, Baumann SB, Kruth JG (2012). "Electromagnetic emission from humans during focused intent". Journal of Parapsychology. 76 (2): 275–294.
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Further reading
- Beloussov LV, Voeikov VL, Martynyuk VS (2007). Biophotonics and Coherent Systems in Biology. New York, NY: Springer. ISBN 978-0387-28378-4.
- Hyland GJ (December 1998). "Non-thermal bioeffects induced by low-intensity microwave irradiation of living systems". Engineering Science & Education Journal. 7 (6): 261–9. .
- Kühnert H. "Wirkungsweise der Biophotonen" [How biophotons work] (in German). Archived from the original on 2021-08-02. Retrieved 2017-09-18.
- Popp FA, Li KH, Gu Q (1992). Recent advances in biophoton research and its applications. Singapore: World Scientific. ISBN 978-981-02-0855-4. Archived from the originalon 2009-02-20.
- Tilbury RN, Gregg DJ, Percival JM (1997). Ultraweak chemiluminescence from human blood plasma. 1st internet conference on photochemistry and photobiology.
External links
- Bischof M. "Bibliography on biophoton research and related subjects". International Institute of Biophysics. Archived from the original on 2010-01-25.
- Hyland GJ. "Fundaments of Coherence in Biology". Biophotonik. Archived from the original on 2004-05-19.