TY - JOUR

T1 - Effect of long- and short-term exposure to laser light at 1070 nm on growth of Saccharomyces cerevisiae

AU - Aabo, Thomas Ask

AU - Perch-Nielsen, Ivan R.

AU - Dam, Jeppe Seidelin

AU - Palima, Darwin

AU - Siegumfeldt, Henrik

AU - Glückstad, Jesper

AU - Arneborg, Nils

N1 - Special Section on Selected Topics in Biophotonics: Photodynamic Therapy and Optical Micromanipulation for Biophotonics

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

KW - Former LIFE faculty

U2 - 10.1117/1.3430731

DO - 10.1117/1.3430731

M3 - Journal article

C2 - 20799783

VL - 15

JO - Journal of Biomedical Optics

JF - Journal of Biomedical Optics

SN - 1083-3668

IS - 4

ER -