Characterization of floating activity of indigenous diesel-assimilating bacterial isolates

Ta Chen Lin, Chiu Chung Young, Mann Jing Ho, Mao Song Yeh, Chien Liang Chou, Yu Hong Wei, Jo Shu Chang

研究成果: Article同行評審

40 引文 斯高帕斯(Scopus)

摘要

Six diesel-degrading bacterial strains were isolated from oil-polluted sites located in central Taiwan. The floating activity of the isolates in an oil-supplemented liquid medium was monitored. Cell-surface hydrophobicity as well as cell-free and cell-residue emulsification activities were also investigated. Three isolates, identified as Gordonia alkanivorans CC-JG39, Rhodococcus erythropolis CC-BC04, and R. erythropolis CC-BC11, were found to float and grow near the diesel layer on the surface. The other three isolates (namely, Comamonas testosteroni CC-CF3, Acinetobacter sp. CC-CF5, and Sphingomonas yanoikuyae CC-CG22) did not display floating activity, as they distributed uniformly in the liquid medium. Isolated cell walls of the floating strains appeared to settle at a lower sucrose density than the nonfloating strains. The floating strains were also characterized by a higher cell-surface hydrophobicity and a higher cell-residue emulsification activity than the nonfloating strains. In fact, the floating strains were thought to produce extracellular emulsifiers due to their higher supernatant emulsification activity than the nonfloating strains. The floating activity of G alkanivorans CC-JG39 may be associated with the production of extracellular polymeric substances that formed an "air-bag" structure facilitating cell floating. The floating ability may also correlate with a high cellular hydrophobicity arising from unique cell wall compositions or cell-wall-bound surface active products.

原文English
頁(從 - 到)466-472
頁數7
期刊Journal of Bioscience and Bioengineering
99
發行號5
DOIs
出版狀態Published - 2005 5月

All Science Journal Classification (ASJC) codes

  • 生物技術
  • 生物工程
  • 應用微生物與生物技術

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