1887

Abstract

The microbial composition and spatial distribution in a terephthalate-degrading anaerobic granular sludge system were characterized using molecular techniques. 16S rDNA clone library and sequence analysis revealed that 78·5% of 106 bacterial clones belonged to the δ subclass of the class ; the remaining clones were assigned to the green non-sulfur bacteria (75%), (09%) and unidentified divisions (131%). Most of the bacterial clones in the δ- formed a novel group containing no known bacterial isolates. For the domain , 817% and 183% of 72 archaeal clones were affiliated with and , respectively. Spatial localization of microbial populations inside granules was determined by transmission electron microscopy and fluorescent hybridization with oligonucleotide probes targeting the novel δ-proteobacterial group, the acetoclastic , and the hydrogenotrophic and members of . The novel group included at least two different populations with identical rod-shape morphology, which made up more than 87% of the total bacterial cells, and were closely associated with methanogenic populations to form a nonlayered granular structure. This novel group was presumed to be the primary bacterial population involved in the terephthalate degradation in the methanogenic granular consortium.

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2001-02-01
2020-04-05
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