Population dynamics of free-floating and attached bacteria in a styrene-degrading biotrickling filter analyzed by denaturing gradient gel electrophoresis |
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Authors: | Tresse O Lorrain M-J Rho D |
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Institution: | (1) Biotechnology Research Institute, National Research Council (NRC) Canada, 6100 Royalmount Avenue, Montréal, Québec, H4P 2R2, Canada, |
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Abstract: | Population dynamics was studied in a 52-l biotrickling filter (BTF) operated for 182 days and used to clean air contaminated
with styrene vapors. In the BTF, biomass grew either as free-floating (planktonic) or attached (sessile) microorganisms. PCR-amplified
16S rDNA fragments from planktonic and sessile cells within the bioreactor were analyzed using denaturing gradient gel electrophoresis
(DGGE). The results indicated that the complexity of biofilm community was always more pronounced than the complexity of the
planktonic cell community. Notably, Rhodococcus erythropolis was identified, based on DNA sequence analysis, as one of the biofilm-specific strains. It was also shown that the inoculum,
even when enriched with styrene-degrading bacteria, was not adapted to the growth conditions imposed by the BTF. After a 35-day
microbial acclimation period, the DGGE analysis also showed less variation in the banding pattern representing the microbial
complexity of the biofilm. In addition, the phylogenic fingerprinting method used demonstrated similar banding profiles in
the biofilm along the filter bed.
Electronic Publication |
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Keywords: | |
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