Effect of long- and short-term exposure to laser light at 1070 nm on growth of Saccharomyces cerevisiae.
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.
Aabo
Thomas
T
University of Copenhagen, Department of Food Science, Frederiksberg, Denmark. taa@life.ku.dk
Perch-Nielsen
Ivan R
IR
Dam
Jeppe Seidelin
JS
Palima
Darwin Z
DZ
Siegumfeldt
Henrik
H
Glückstad
Jesper
J
Arneborg
Nils
N
D049109:Cell Proliferation / Q000528:radiation effects; D004307:Dose-Response Relationship, Radiation; D008027:Light; D011829:Radiation Dosage; D012441:Saccharomyces cerevisiae / Q000502:physiology* / Q000528:radiation effects*