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Journal of Biomedical Optics • Open Access

Effect of long- and short-term exposure to laser light at 1070 nm on growth of Saccharomyces cerevisiae
Author(s): Thomas Aabo; Ivan R. Perch-Nielsen; Jeppe Seidelin Dam; Darwin Z. Palima; Henrik Siegumfeldt; Jesper Glückstad; Nils Arneborg

Paper Abstract

The effect of a 1070-nm continuous and pulsed wave ytterbium fiber laser on the growth of Saccharomyces cerevisiae single cells is investigated over a time span of 4 to 5 h. The cells are subjected to optical traps consisting of two counterpropagating plane wave beams with a uniform flux along the x, y axis. Even at the lowest continuous power investigated-i.e., 0.7 mW-the growth of S. cerevisiae cell clusters is markedly inhibited. The minimum power required to successfully trap single S. cerevisiae cells in three dimensions is estimated to be 3.5 mW. No threshold power for the photodamage, but instead a continuous response to the increased accumulated dose is found in the regime investigated from 0.7 to 2.6 mW. Furthermore, by keeping the delivered dose constant and varying the exposure time and power-i.e. pulsing-we find that the growth of S. cerevisiae cells is increasingly inhibited with increasing power. These results indicate that growth of S. cerevisiae is dependent on both the power as well as the accumulated dose at 1070 nm.

Paper Details

Date Published: 1 July 2010
PDF: 7 pages
J. Biomed. Opt. 15(4) 041505 doi: 10.1117/1.3430731
Published in: Journal of Biomedical Optics Volume 15, Issue 4
Show Author Affiliations
Thomas Aabo, Univ. of Copenhagen (Denmark)
Ivan R. Perch-Nielsen, Technical Univ. of Denmark (Denmark)
Jeppe Seidelin Dam, Technical Univ. of Denmark (Denmark)
Darwin Z. Palima, Technical Univ. of Denmark (Denmark)
Henrik Siegumfeldt, Copenhagen Univ. (Denmark)
Jesper Glückstad, Technical Univ. of Denmark (Denmark)
Nils Arneborg, Copenhagen Univ. (Denmark)

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