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Surface Hydrophobicity of Naturally Occurring Bacterial Cultures Degrading Aliphatic Hydrocarbons and Diesel Oil :

Bioavailability limitation is one of the most critical factors governing the fate and persistence of NAPL contaminants. The present research explores the NAPL uptake mechanism and degradation efficiency of two naturally occurring bacterial cultures, i.e., Exiguobacterium aurantiacum NCDO 2321 (T) and Burkholderia cepacia LMG 12614t2, identified based on 16S rDNA sequencing. The hydrocarbon biodegradation potential of E. aurantiacum has not been reported earlier. Moreover, the NAPL uptake mechanisms for these cultures have not been reported in the literature. Both the cultures were able to grow on simple and complex NAPLs, n-hexadecane and diesel oil, as sole source of carbon and energy. The cell surfaces of both the cultures were found to be highly hydrophobic based on BATH assay and contact angle measurements. Higher adherence to NAPLs and higher water contact angle was induced by growth on NAPL substrates in contrast to growth on soluble substrate dextrose.   More Info

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