Lead precipitation by Vibrio harveyi: evidence for novel quorum-sensing interactions

Article Abstract:

Studies of prokaryotic tolerance and resistance to soluble lead have revealed an efflux mechanism as well as precipitation of lead in an insoluble form and three pleitropic vibrio harveyi mutants were observed for precipitate soluble Pb2+ as an insoluble compound. One of the V-harveyi mutants showed little or no response to intercellular signals from other V-harveyi inocular and it is suggested that V-harveyi carries at least one quorum sensor that is dedicated to receiving cross-species communication.

Lead compounds, Quorum sensing

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Distribution and stability of sulfate reducing prokaryotic and hydrogenotrophic methanogenic assemblages in nutrient-impacted regions of the Florida everglades

Article Abstract:

The dynamics of sulfate-reducing and methanogenic assemblages were characterized using terminal restriction fragment length poly-morphism (T-RFLP) targeting the dissimilatory sulfite reductase and methyl coenzyme M reductase genes. T-RELP combined with principal component analysis was a powerful technique to discriminate between soils from sites with eutrophic, transitional, and oligotrophic nutrient concentrations.

Florida, Environmental aspects, Genetic polymorphisms, Everglades

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Molecular characterization of the nonphotosynthetic partner bacterium in the consortium "Chlorochromatium aggregatum"

Article Abstract:

'Chlorochromatium aggregatum' is enriched chemotactically, and the 16S rRNA gene sequence of the central bacterium is elucidated. Genomic DNA of the central bacterium of 'Chlorochromatium aggregatum' formed a distinct band that could be detected by quantitative PCR using specific primers and using this method, the G+C content of the central bacterium was determined to be 55.6 mol%.

Nucleotide sequencing

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