Effects of near-infrared laser and superluminous diode irradiation on Escherichia coli division rate

Author

Karu, Tiina ; Tiphlova, Olga ; Samokhina, Margarita ; Diamantopoulos, Costas ; Sarantsev, Vyatcheslav P. ; Shveikin, Vassili

Author_Institution

Laser Technol. Center, Acad. of Sci., Troitsk, USSR

Volume

26

Issue

12

fYear

1990

fDate

12/1/1990 12:00:00 AM

Firstpage

2162

Lastpage

2165

Abstract

An investigation is conducted of the effect of a 1300-nm continuous-wave (CW) laser diode 950-nm modulated superluminous diode which had a fixed average power density of 1.2×10³ W/m ² at all variable repetition rates of 2, 26, 700, 1000, and 5000 Hz and had an equivalent pulse duration of 410, 31.1, 1.15, 0.82, and 0.16 ms, respectively. The effect of both diodes on the rate of Escherichia coli WP2 division was examined. It was found that the radiation of the CW mode of the 1300-nm laser diode increased the division of E. coli in the dose range of 0.9-9.0 J/cm². The 950-nm pulsed irradiation increased or inhibited the division rate of bacteria depending on the pulsing frequency and/or pulse duration

Keywords

biological effects of laser radiation; cellular effects of radiation; 1300 nm; 950 nm; Escherichia coli division rate; average power density; bacteria; continuous wave diode laser; equivalent pulse duration; modulated superluminous diode; pulsed irradiation; pulsing frequency; repetition rates; superluminous diode irradiation; Biological system modeling; Diode lasers; Frequency; Laser modes; Laser theory; Microorganisms; Optical pulses; Pulse modulation; Semiconductor diodes; Semiconductor lasers;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.64353

Filename

64353