TAILIEUCHUNG - Báo cáo " An active PAH-degrading microbial consortium developed from dioxin-contaminated sediments via enrichment technique "

Via enrichment procedures carried out on a dioxin contaminated sediment sample from lotus pond at Danang airport, a microbial community assigned as DN553 with high capability of carbazol degradation was established. Analyses of community structure by using denaturing gradient gel electrophoresis (DGGE) of 16S rDNA fragments indicated that Achromobacter and Alcaligenes species dominated in this enrichment culture. | VNU Journal of Science Natural Sciences and Technology 25 2009 158-164 An active PAH-degrading microbial consortium developed from dioxin-contaminated sediments via enrichment technique Nguyen Thi Hanh1 Nguyen Hong Minh1 Duong Van Hop2 Dinh Thuy Hang2 1University of Natural Sciences VNU 334 Nguyen Trai street Thanh Xuan district Hanoi 2Institute of Microbiology and Biotechnology VNU 144 Xuan Thuy street Cau Giay district Hanoi Received 24 April 2009 Abstract. Via enrichment procedures carried out on a dioxin contaminated sediment sample from lotus pond at Danang airport a microbial community assigned as DN553 with high capability of carbazol degradation was established. Analyses of community structure by using denaturing gradient gel electrophoresis DGGE of 16S rDNA fragments indicated that Achromobacter and Alcaligenes species dominated in this enrichment culture. In addition to carbazol the enrichment culture was also able to utilize other PAH compounds such as naphthalene and phenanthrene as the only carbon and energy sources. In the presence of different PAH as growth substrates the community structure changed accordingly however the Achromobacter and Acaligenes groups still remained. Thus the enrichment cultures DN553 could be a potential microbial source for the treatments of PAH contamination. Keywords. Enrichment culture PAH degradation DGGE 16S rDNA Achromobacter Alcaligenes 1. Introduction Polycyclic aromatic hydrocarbons PAHs make a class of organic compounds that consist of two or more fused benzene and pentacyclic rings that are arranged in various structural configurations. They are highly recalcitrant molecules that can persist in the environment due to their high hydrophobicity and low water solubility 1 . PAHs are ubiquitous in the natural environment and originate from two Corresponding author. Tel. 84 4 37547694 E-mail dthang@ main sources natural biogenic and geochemical and anthropogenic 2 of which the latter is the major cause of .

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