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Proceedings Paper

Effects of speckle-like laser irradiation on growth of bacteria in vitro
Author(s): A. Yu. Popov; N. A. Popova; A. V. Tyurin; V. Grimblatov
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Paper Abstract

In this work, for the first time, we have demonstrated the biological effects upon in vitro growth of bacteria and human peripheral blood erythrocytes of the irradiation with speckle-like highly-gradient laser light. Measurements of the growth of Staphylococcus aureus with and without antibiotic irradiated with uniform or interference pattern of intensity spatial distribution have shown strong dependence on the spatial frequency of the irradiation. Maximum inhibition of the bacteria growth was achieved at the frequency 1000 fringes/mm. It was also found that human blood erythrocytes exposure to such radiation at the power density typical for laser phototherapy could damage the erythrocytes. A possible explanation of the photo-biological effects of laser speckle irradiation relying on the electron-ion processes similar to those that occur under inhomogeneous illumination in inorganic media and called photo-stimulated diffusion of ions (Dember effect) is proposed and discussed.

Paper Details

Date Published: 5 March 2013
PDF: 8 pages
Proc. SPIE 8569, Mechanisms for Low-Light Therapy VIII, 85690C (5 March 2013); doi: 10.1117/12.2002128
Show Author Affiliations
A. Yu. Popov, Odessa I.I. Mechnikov National Univ. (Ukraine)
N. A. Popova, Odessa I.I. Mechnikov National Univ. (Ukraine)
A. V. Tyurin, Odessa I.I. Mechnikov National Univ. (Ukraine)
V. Grimblatov, Photonics Life Technologies Lab. (United States)

Published in SPIE Proceedings Vol. 8569:
Mechanisms for Low-Light Therapy VIII
Michael R. Hamblin; Juanita Anders; James D. Carroll; Praveen R. Arany, Editor(s)

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