Phylogenetic evidence for the existence of novel thermophilic bacteria in hot spring sulfur-turf microbial mats in Japan

Article Abstract:

Cloning and sequencing of the genes coding for the 16S ribosomal RNA were undertaken to determine the phylogenetic positions of sausage-shaped bacteria found in sulfur-turf microbial mats in sulphide-containing hot springs in Japan. Phylogenetic analysis revealed a relationship between these bacteria and the Aquifex-Hydrogenobacter complex. The bacteria found in the sulfur-turf mats belongs to a clade different from the other members of the Aquifex-Hydrogenobacter complex.

Bacteria, Microbial mats, Identification and classification, Sulfur bacteria

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Phylogenetic characterization of a polychlorinated-dioxin-dechlorinating microbial community by use of microcosm studies

Article Abstract:

A microbial community capable of dechlorinating polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDD/Fs) was studied by using laboratory scale microcosms. It suggests that the complete dechlorination of PCDD/Fs found in the microcosm was due to a combination of the dechlorinating activity of the 'Dehalococcoides'-like organisms and the oxidative degradation of the dechlorinated products by aerobic bacteria with aromatic hydrocarbon dioxygenases.

Genetic research

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Molecular analysis of arsenate-reducing bacteria within Cambodian sediments following amendment with acetate

Article Abstract:

A suite of molecular techniques were used to identify As(V)-respiring bacteria and their corresponding respiratory As(V) reductase genes in sediments collected from a Cambodian aquifer with elevated aqueous arsenic concentrations. The results identified a direct link between inputs of carbon and the increased prevalence of organisms which actively convert As(V) to the potentially more mobile As(III).

Analysis, Physiological aspects, Polymerase chain reaction, Heavy metals, Heavy metal poisoning

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