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Germicidal ultraviolet (UVC) light kills cells by damaging their DNA. The light initiates a reaction between two molecules of thymine, one of the bases that make up DNA. UV light at this wavelength (shortwave UV or UVC) causes adjacent thymine molecules on DNA to dimerize. The resulting thymine dimer is very stable. If enough of these defects accumulate on a microorganism's DNA its replication is inhibited, thereby rendering it harmless.

The longer the exposure to UVC light, the more thymine dimers are formed in the DNA. If cellular processes are disrupted because of DNA damage, the cell cannot carry out its normal functions. If the damage is extensive and widespread, the cell will die.

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15y ago
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Linda Zimmer

Lvl 2
3y ago

i have a tent on the deck with a uv light in it and wipes, spray disinfectant ,it is where all my mail.and shopping items go before bring them in the house.. Better to be safe than sorry! The most effective i guess are kryptolights!

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14y ago

In fact some do. Our science teacher used it to kill the germs of googles we use when experimenting chemicals.

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15y ago

Yes as a matter of fact it is used in water sanitising systems.

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Q: Does UV light kill germs
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Can you put a uv light in your mouth to kill germs?

Well, yes. But it's probably not good for you. Think sunburn in your mouth...


Does uv light kill listeria?

yes uv light does kill listeria and does not hurt the food


Does UV light kill ringworm?

yes the UV light kills the fungus


Can uv light kill candida?

If UV kill pathogen microorganisms(GERMS,BACTREIAS,VIRUSES,FUNGI) in UV water filtering systems,it can surely kill yeasts and fungi in the blood submitted to the UV irradiation .All we need is a NEW DR BECK WHO WILL DESIGN A DIALYSIS STYLE machine in which the blood WILL FLOW from the right hand to the left or the opposite after being submitted during his flow in a transparent tube to UV irradiations.


How does a toothbrush sanitizer function?

It works by killing germs i.e. bacteria, viruses, fungi and protozoa. There are two main types of toothbrush sanitizers for consumers. One type uses UV light to kill germs. The other type, which is more effective, uses steam to kill germs. Given that some germs can make us sick, killing the germs found on the toothbrush therefore sanitizes the toothbrush.


Can light kill germs in water?

very well


How long does it take uvc light to kill germs?

I have a uv filter on my pond pump and it kills bacteria in about a second. . . I have a uv-c light wand and in the directions it says that exposure times should be 10 to 20 seconds it might vary on what you are killing also. I know dust mites takes 20 seconds


Does UV light kill viruses?

UV rays (Ultra violent rays) kills plants and humans.


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Yes. It is amazing you can see every germ particle on your hands, arms, etc.


Where can find germ scanner?

Amazon.com. They have a germ scanner disinfectant with UV light that kills germs in literally seconds!


Can ultra-violet light kill germs?

No, but if you put on a cream you can see them.


What is a reason to not avoid UV radiation?

There are at least four good reasons not to avoid UV radiation. One of these is when it is used to kill germs. Another use is for "curing". This is what the dentist does when he puts a UV light into your mouth, to cure the bonding material. A third use is to detect counterfeit paper money. You may see a cashier put a bill under a UV lamp to check its authenticity. And the last of the four that I will supply is when they aim a UV light at your hand or arm to check to see if you are allowed to reenter a venue!