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Ultraviolet radiation is a common method of killing bacteria and viruses. Researchers from Tel Aviv University have now shown that the new coronavirus, SARS-CoV-2, can be eliminated efficiently and quickly using ultraviolet (UV) diodes that emit light (UV-LED) at certain frequencies. “Jerusalem Post”.
“We found it very easy to kill the coronavirus with LED bulbs that emit ultraviolet light,” said Professor Hadas Mamane, director of the Environmental Engineering Program at the School of Mechanical Engineering at Tel Aviv University, who is leading the study with his colleagues Prof Joram Gerchman and Dr. Michal Mandelboim.
He said that UV LED bulbs take less than half a minute to kill more than 99.9% of coronaviruses, BGNES reported.
The study is the first of its kind in the world. An article about him was published earlier this month in the Journal of Photochemistry and Photobiology B: Biology.
The Jerusalem Post has written about Mamane many times. He presented this summer at the 2020 Boris Mints Institute research conference for his participation in the construction of a 30-meter “green wall” at the university, which aims to create a sustainable ecosystem of waste, energy and water. The wall is also intended to act as a living laboratory for the analysis of the use of “gray water” (wastewater generated by sinks, showers, bathrooms and washing machines) in the absorption of carbon dioxide, as well as the effects on heat transfer. and the generation of heat. energy within old buildings prevailing in cities.
At the beginning of the coronavirus crisis, his research team developed an inexpensive, decentralized and non-polluting Israeli agent for the production of ethanol, and therefore an alcohol-based hand sanitizer, from plant waste, straw. and residual paper fibers.
LEDs are available in a wide range of wavelengths known as A, B and C, Mamane explained. UV-A has a wavelength in the range of 315 nanometers (nm) to 400 nm. UV-B, also known as medium wave, has a wavelength of 280-315 nm; UV-C has a wavelength of 200-280 nm. UV-A rays are emitted by the sun (and man-made sources like tanning beds) and are weaker than UV-B and C rays. It has some benefits for humans, such as the production of vitamin D, but it also causes sunburns and, in some cases, skin cancer. UV-B and UV-C radiation almost never reaches humans naturally, as these rays are absorbed by the earth’s ozone layer.
Photo: BGNES
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