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The production of biosurfactant by Bacillus subtilis JK-1 was investigated under several conditions. In sea water inoculated with 10% (v/v) of seed culture, the surface tension decreased from 75.0 to 38.4 dyne/cm after 12 h of incubation, which was the highest reduction of surface tension (49%) among the conditions tested. Surface tension further decreased to 31.2 dyne/cm when grown in 1% (v/v) B. subtilis...
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