UVC DISINFECTION SCIENCE.mp4
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How does UVC light affect DNA? See DNA before (left) and after (right) exposure to UVC light. Notice the bulging of the outer sugar phosphate backbone, and the breaking and reformation of the base pairs.
UVC irradiation is a physical process that disrupts and damages the nucleic acid (DNA and RNA) of harmful organisms such as viruses, bacteria, and fungi. The UVC light produces electromagnetic energy that causes a photo-chemical reaction, triggering the formation of specific thymine or cytosine dimers in DNA and uracil dimers in RNA. This alteration of the DNA and RNA strands leaves the organisms sterile, rendering them unable to function or reproduce. In scientific terms, a sterile organism is in essence a dead organism. Since they can’t reproduce, the organisms can’t spread, and the pathologic effect has been eliminated.
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