title: Characterization of bacterial isolates from industrial wastewater according to probable modes of hexadecane uptake.
abstract: Bacterial isolates from industrial wastewater were characterized according to probable modes of hexadecane uptake based on data for cell surface hydrophobicity, emulsifying activity, glycoside content and surface tension of cell-free culture medium. The results obtained suggested that both modes of biosurfactant-enhanced hexadecane uptake by bacterial strains take place, direct uptake and alkane transfer. The increase in cell surface hydrophobicity and glycoside production by the strains suggested the existence of biosurfactant-enhanced interfacial uptake of the alkane. Such mechanism is probably predominant for three isolates, Staphylococcus sp. HW-2, Streptococcus sp. HW-9 and Bacillus sp. HW-4. Secreted biosurfactants enhanced mainly alkane emulsification for most hydrophobic isolate Arthrobacter sp. HW-8, and micellar transfer for most hydrophilic isolate Streptococcus sp. HW-5. For other strains (67%) both mechanisms of biosurfactant-enhanced hexadecane uptake probably take place in similar degree, interfacial uptake and alkane emulsification. The results obtained could contribute to clarifying the natural relationships between the members of water ecosystem studied as well as will reveal potential producers of surface active compounds.
authors.affiliation: Department of Microbial Biochemistry, Institute of Microbiology, Bulgarian Academy of Sciences, Sofia, Bulgaria. evaston@yahoo.com <evaston@yahoo.com>
authors.forename: Evgenia
authors.initials: E
authors.lastname: Vasileva-Tonkova
authors.forename: Danka
authors.initials: D
authors.lastname: Galabova
authors.forename: Emilia
authors.initials: E
authors.lastname: Stoimenova
authors.forename: Zdravko
authors.initials: Z
authors.lastname: Lalchev
mesh_terms: D000473:Alkanes / Q000378:metabolism*; D001419:Bacteria / Q000145:classification / Q000254:growth & development / Q000302:isolation & purification* / Q000378:metabolism*; D045703:Emulsifying Agents / Q000378:metabolism; D057927:Hydrophobic and Hydrophilic Interactions; D007220:Industrial Waste; D013501:Surface-Active Agents / Q000378:metabolism; D014871:Water Microbiology
chemical_list: D000473:Alkanes; D045703:Emulsifying Agents; D007220:Industrial Waste; D013501:Surface-Active Agents; C007932:n-hexadecane