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Applied and Environmental Microbiology, November 2004, p. 6905-6908, Vol. 70, No. 11
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.11.6905-6908.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

In Vitro Laser Ablation of Natural Marine Biofilms

Kanavillil Nandakumar,1* Hideki Obika,2 Akihiro Utsumi,2 Toshihiko Ooie,2 and Tetsuo Yano2

Great Lakes Institute for Environmental Research, University of Windsor, Windsor, Ontario, Canada,1 Marine Eco-materials Research Group, Marine Resources and Environment Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Hayashi-cho, Takamatsu, Kagawa, Japan2

Received 5 January 2004/ Accepted 31 May 2004

ABSTRACT

We studied the efficiency of pulsed low-power laser irradiation of 532 nm from an Nd:YAG (neodymium-doped yttrium-aluminum-garnet) laser to remove marine biofilm developed on titanium and glass coupons. Natural biofilms with thicknesses of 79.4 ± 27.8 µm (titanium) and 107.4 ± 28.5 µm (glass) were completely disrupted by 30 s of laser irradiation (fluence, 0.1 J/cm2). Laser irradiation significantly reduced the number of diatoms and bacteria in the biofilm (paired t test; P < 0.05). The removal was better on titanium than on glass coupons.

* Corresponding author. Mailing address: Department of Biology, Lakehead University, 955 Oliver Rd., Thunderbay, ON, Canada P7B 5E1. Phone: (807) 766-7151. Fax: (807) 346-7796. E-mail: nandakumar.kanavillil{at}lakeheadu.ca.

Applied and Environmental Microbiology, November 2004, p. 6905-6908, Vol. 70, No. 11
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.11.6905-6908.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.





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