STUDY OF THE EFFECT OF AR+ LASER AND HE-NE LASER ON THE BACTERRIA STAPHYLOCOCCUS AUREUS

Abstract

The present study has been carried out on (20) samples of Staphylococcus aureus which cause disease forhuman being and isolated from wounds that for the inpatients of Tikrit teaching hospital / Orthopedics floor .The effect of Argon Ion laser of (150) mW , wavelength (515) nm and power density (1326.964) W/cm2continues (CW) has been studied . The study also includes Helium-Neon He-Ne laser with power of (5) mw and(632.8 )nm wavelength and power density (113.234) W/cm2 with continues wave (CW) .The present studyshows that the exposure of Staphylococcus aureus bacteria to the Argon ion (Ar+) laser after focusing with a lens( f = 15 cm ) for periods of time (5,10,15,20,25,30,35)min. The relation between radiated areas of the bacteriaexposured to the argon ion laser and exposure time is directly proportional . Because the Gaussian distributionof the laser beam , the areas exposed to laser are divided into two areas , the first one was dark ,It lies at center (the bacteria are totally killed ) . The second is around the first area , It was light ( The bacteria are partially killed) .The study also shows that the exposure of the similar samples of bacteria to Helium-Neon(He-Ne) Laserunder the same conditions dose not show significant effect .