Deuterium-depleted water

Deuterium-depleted water

Deuterium-depleted water (DDW), or "light water",[1] is water which has a lower concentration than naturally occurs of deuterium, a heavier isotope of hydrogen which has, in addition to its one proton, a neutron, roughly doubling its mass.

In Vienna Standard Mean Ocean Water, deuterium occurs at a rate of 155.76 ppm. The production of heavy water involves isolating deuterium and produces light water as a by-product. Production of light water can result during electrolysis, distillation, and desalination. It can also be produced directly using the Girdler sulfide process.[1]

Experiments have shown that consumption of light water may be beneficial as an adjunct to chemotherapy. A 1999 Romanian study found that water with only 30ppm deuterium produced marked improvement in survival rates of mice bombarded with ionizing radiation.[2] A study of four patients with brain metastases from lung cancer found a three-month regimen of light water "noticeably prolonged" their survival time.[3] A 2010 Hungarian study found significant improvement in the survival times of prostate cancer patients treated with light water.[4] Despite Gilbert Lewis' call in 1934 for such experiments[5], research on the effects of deuterium-depletion on living cells has been very limited with less than a dozen peer-reviewed research papers available via Pub Med in mid-2011[6]. On the other hand, low doses of heavy water can slow the aging process by helping the body resist oxidative damage via the isotope effect.[7]

Other uses

In nuclear reactor technology, by comparison with heavy water reactors, thermal reactors using normal water are known as light water reactors. Thus "light water" is sometimes used to describe standard water.

References

  1. ^ a b Boyle, Rebecca (6 Jan 2011). "With New Method, China Can Mass-Produce Light Water For Its Citizens' Thirst". Popular Science. http://www.popsci.com/science/article/2011-01/chinese-invent-new-method-producing-healthier-light-water. Retrieved 7 Jan 2011. 
  2. ^ Bild, W; Stefanescu, I; Haulica, I; Lupuşoru, C; Titescu, G; Iliescu, R; Nastasa, V (1999). "Research concerning the radioprotective and immunostimulating effects of deuterium-depleted water". Romanian journal of physiology 36 (3-4): 205–18. PMID 11797936. 
  3. ^ Krempels, Krisztina; Somlyai, Ildikó; Somlyai, Gábor (2008). "A Retrospective Evaluation of the Effects of Deuterium Depleted Water Consumption on 4 Patients with Brain Metastases from Lung Cancer". Integrative Cancer Therapies 7 (3): 172–81. doi:10.1177/1534735408322851. PMID 18815148. 
  4. ^ Somlyai, Gábor; Molnár, Miklós; Laskay, Gábor; Szabó, M; Berkényi, Tamás; Guller, Imre; Kovács, András (2010). "A természetben megtalálható deutérium biológiai jelentősége: a deutériumdepletio daganatellenes hatása [Biological Significance of Naturally Occurring Deuterium: the Antitumor Effect of Deuterium Depletion]" (in Hungarian). Orvosi Hetilap 151 (36): 1455–60. doi:10.1556/OH.2010.28865. PMID 20739263. 
  5. ^ Lewis, G. N. (1934). "THE BIOLOGY OF HEAVY WATER". Science 79 (2042): 151–153. Bibcode 1934Sci....79..151L. doi:10.1126/science.79.2042.151. PMID 17788137.  edit
  6. ^ Steven J. Koch (4 March 2011). "I am maximally-skeptical that there currently exists any evidence that drinking deuterium-depleted water has health benefits or will cure disease". http://stevekochscience.blogspot.com/2011/03/i-am-maximally-skeptical-that-there.html. Retrieved 22 July 2011. 
  7. ^ Mikhail S. Shchepinov (1 March 2007). "Reactive Oxygen Species, Isotope Effect, Essential Nutrients, and Enhanced Longevity". Rejuvenation Research 10 (1): 47–60. doi:10.1089/rej.2006.0506. PMID 17378752. 

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