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http://dx.doi.org/10.11626/KJEB.2013.31.2.113

Effects of Low Powered Ultrasonic Wave Exposure on Microcystis sp. (Cyanobacteria)  

Park, Young Mi (Department of Biological Science, Andong National University)
Kwon, O Chang (Department of Biological Science, Andong National University)
Park, Jung Won (National Park Research Institute)
Chung, Gyu Young (Department of Medicinal Plant Resource, Andong National University)
Lee, Jong Eun (Department of Biological Science, Andong National University)
Seo, Eul Won (Department of Biological Science, Andong National University)
Publication Information
Korean Journal of Environmental Biology / v.31, no.2, 2013 , pp. 113-120 More about this Journal
Abstract
This study aimed to investigate the effects of ultrasonic wave on colonial changes of Microcystis sp. causing water-bloom. The effects of frequency change and exposure time of ultrasonic wave on Microcystis sp. were also perceived by measuring the concentration of chlorophyll-a. The concentrations of chlorophyll-a showed a decreasing tendency in all experimental groups exposed to ultrasonic waves, especially the highest decrease at 70 kHz. Before exposed to ultrasonic wave, single cells of Microcystis sp. were observed in a form of colonies which were densely accumulated onto their mucilage layer. However, after one hour exposure to 70 kHz ultrasonic wave, the bonds of colonies were weakened and single cells were separated from the colonies. Moreover, the single cells of the colony were destroyed with the 5 hour exposure time at 70 kHz. As a result, we proposed that the frequency strength and the exposure time of ultrasonic wave might have effects in decrease of biomass of blue-green algae by reducing the concentration of chlorophyll-a, thereby changing and destroying forms of Microcystis sp. colonies.
Keywords
ultrasonic wave; blue-green algae; chlorophyll-a; water-bloom; Microcystis sp.;
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