Selective control of cyanobacteria by surfactin-containing culture broth of Bacillus subtilis C1 |
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Authors: | Ahn Chi-Yong Joung Seung-Hyun Jeon Jong-Woon Kim Hee-Sik Yoon Byung-Dae Oh Hee-Mock |
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Institution: | (1) Environmental Biotechnology Laboratory, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-333, Korea |
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Abstract: | Of several types of chemical surfactants and biosurfactants, only the culture broth of Bacillus subtilis C1 containing surfactin at 10 mg l–1 completely inhibited the growth of Microcystis aeruginosa, a bloom-forming cyanobacterium in highly eutrophic lakes. The broth with 10 mg surfactin l–1 also removed 85% of the maximally grown M. aeruginosa (chlorophyll-a concentration, 1000 g l–1) within 2 d, and the removal efficiency was enhanced by Ca2+ over 1 mM. The growth of Anabaena affinis, another bloom-forming cyanobacterium, was also inhibited about 70% with surfactin at 10 mg l–1 broth. However, the effect of the broth was delayed over 3 d in the green algae, Chlorella vulgaris and Scenedesmus sp., and was negligible in a diatom, Navicula sp., indicating the potential for the selective control of cyanobacterial blooms. |
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Keywords: | Bacillus subtilis cyanobacteria Microcystis aeruginosa selectivity surfactin |
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