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Researchers Kill Viruses With Lasers

Researchers Kill Viruses With Lasers

A father and son team of researchers has developed a new method for disinfecting blood for transfusions. The normal method of UV radiation in combination with radioisotopes tends to leave behind damaged and mutated blood cells, whereas this new method, which utilizes a low-power pulsating laser, generally leaves non-viral cells untouched.

Johns Hopkins University student Shaw-Wei David Tse and his father Kong-Thon Tsen -- a laser expert at Arizona State University -- pointed a low-power, visible wavelength laser at test tubes containing viruses diluted in a saline solution. The scientists found that the pulsating laser reduced the amount of viruses in the solution 100- to 1000-fold. The results surprised them so much that they repeated the experiment several times, each time with the same conclusion.

What's happening is that the pulsing of the laser creates vibrations that destroy viruses -- even drug-resistant ones, which could one day potentially include HIV and hepatitis. The pulsing of the laser allows the material around the viruses to cool off between blasts, which prevents damage to blood cells that might otherwise be sustained if a continuous beam was used.

The technology sounds promising, but there is always the chance that this will end up like the old needle-less syringe, a great idea forgotten because the current system is "good enough."

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