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The researchers said that these results suggest that their laser method can deactivate viruses and kill bacteria, while leaving human cells unharmed. K.T. Tsen, the Arizona State University professor who led the investigation, said that the team currently is investigating the technique for use in destroying HIV and for disinfecting blood

^{Red light activates the substance and initiates a chain-reaction that kills the bacteria. Antibacterial blue light administered at the same time significantly enhances the effect," explains Pätilä.}

Duke University Medical Center. Summary: A newly discovered mechanism by which an infectious fungus perceives light also plays an important role in its virulence, according to Howard Hughes

Ultraviolet-A (UVA) phototherapy is FDA-approved for several dermatological diseases but not for internal applications. We investigated UVA effects on human cells in vitro, mouse colonic tissue in vivo, and UVA efficacy against bacteria, yeast, coxsackievirus group B and coronavirus-229E. Several pathogens and virally transfected human cells Products powered by Violet Defense technology use a powerful, broad spectrum light, including germicidal UV-C, UV-B, UV-A, and violet blue that optimize their germ-killing efficiency. UV-C (200-280 nm) is most traditionally referred to as germicidal UV with ability to kill bacteria, viruses, mold, and fungi. ^{These observations suggest that ROS were generated exclusively in bacteria and well confined within. In accordance with this, most fibroblasts were stained by a vital fluorescent dye calcein acetoxymethyl ester when the cells were cocultured with bacteria and exposed to blue light at 60 J/cm 2 and carvacrol (0.2 mg/ml) (Fig. 3C and fig}

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^{One explanation is that bacteria contain light-sensitive, iron-rich molecules that, upon absorbing blue light, generate free radicals that kill the bacteria. Enwemeka suggests that blue light also acts on cytochrome c oxidase in the cells’ mitochondria—like NIR light—but in this case causes the cytochrome to pair up with nitric oxide} ^{No, UV light disinfection systems will only disinfect water at the point of contact. As soon as water leaves the UV light disinfection system recontamination from back flow, breaks and biofilms (slime) can occur as there is no residual disinfectant in the water. Well designed water treatment systems always locate UV light disinfection systems} E. coli is a type of fecal coliform bacteria commonly found in the intestines of animals and humans. A positive E. coli result is much more serious than coliform bacteria alone because it indicates that human or animal waste is entering the water supply. There are hundreds of strains of E. coli.

And P. acnes just so happens to emit its own photosensitizer, which makes it sensitive to blue wavelengths of light. Shining blue light onto acne-prone skin can kill the bacteria and clear up

Blue light energy extends into the dermal layer of skin tissue, where it encounters collagen and elastin — the two proteins responsible for giving skin its strength and flexibility. When collagen and elastin weaken due to free radical damage, the signs of aging accelerate (also known as photoaging) because skin loses its plump, voluminous Oral black-pigmented bacteria (BPB) in pure cultures and in dental plaque samples were killed by 4.2 J/cm 2 blue light, whereas P. melaninogenica required 21 J/cm 2. 3) Propionibacterium acnes was also inactivated by blue light without an exogenous photosensitizer. 4,5) Investigations using a high-intensity xenon lamp, 6) have demonstrated the cDKrTfs.

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does blue light kill bacteria