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The curve for E. coli is given in the figure, with the most effective UV light having a wavelength of 265 nm. This applies to most bacteria and does not change significantly for other microbes. Dosages for a 90% kill rate of most bacteria and viruses range between 2,000 and 8,000 μJ/cm 2.
A germicidal lamp (also known as disinfection lamp or sterilizer lamp) is an electric light that produces ultraviolet C (UVC) light. This short-wave ultraviolet light disrupts DNA base pairing, causing formation of pyrimidine dimers, and leads to the inactivation of bacteria, viruses, and protozoans.
Natural light exposure has been associated with faster cognitive processing speeds and enhances working memory capacity. [62] Additionally, UV exposure plays a role in motor learning and object recognition memory. Moderate UV exposure enhances cognitive functioning through a specialized glutamate (GLU) biosynthetic pathway in the brain. [63]
In other words, the right kind of UV rays have been proven to kill a variety of pathogens, including bacteria, viruses, and other coronaviruses, like Middle Eastern respiratory syndrome ...
Ultraviolet (UV) is normally hazardous both to microbes and humans. He discovered that a far-UVC band of light within a confined wavelength range around 200 nanometers was cytotoxic to bacteria but appeared, unlike wide band UV, to be absorbed by, and not to penetrate beyond, the outer dead layers of skin, and not to damage eyes.
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