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Biosurfactants produced by Bacillus circulans and Streptomyces sp. were used for biomodification of both serpentinite and quartz surfaces. The biosurfactants produced by bacteria possess the ability to decrease the surface tension of water from 72 to 28.6 mNm-1 (Bacillus circulans) and to 29.3 mNm-1 (Streptomyces sp.). This paper demonstrated biomodification of quartz and serpentinite surfaces by...