Degradation of chlorobenzenes at nanomolar concentrations by Burkholderia sp. strain PS14 in liquid cultures and in soil

Article Abstract:

The utilization of 1,2,3,4-tetrachloro-, 1,2,4-trichloro-, the three isomeric dichlorobenzenes and fructose as the sole carbon and energy sources at nanomolar concentrations was studied in batch experiments with Burkholderia sp. strain PS14. In liquid culture, all chlorobenzenes were metabolized within one hour from their initial concentration of 500 nM. In soil microcosms, Burkholderia sp. strain PS14 metabolized tetrachlorobenzene over a 72-hour incubation period. These indicate that strain PS14 exhibits a very high affinity for chlorobenzenes at nanomolar concentrations.

Biodegradation, Soil microbiology, Bacteria, Pathogenic, Pathogenic bacteria, Bacteriology, Chlorobenzene, Chlorobenzenes, Bacterial cultures

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Evidence that formation of protoanemonin from metabolites of 4-chlorobiphenyl degradation negatively affects the survival of 4-chlorobiphenyl-cometabolizing microorganisms

Article Abstract:

The metabolism of 4-chlorocatechol via the 3-oxoadipate pathway produces the antibiotic protoanemonin that is toxic to indigenous and supplemented 4-chlorobiphenyl-cometabolizing bacteria in soil. The survival of soil bacteria and fungi is adversely affected by the direct addition of protoanemonin, but is unaffected by its degradation. The addition of organisms that contain the meta-cleavage pathway for 4-chlorocatechol metabolism increases the survival of the soil bacteria. This suggests that protoanemonin is formed via the ortho-cleavage pathway.

Antibiotics, Physiological aspects, Microbial metabolism, Bacterial toxins

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Mineralization of 4-chlorodibenzofuran by a consortium consisting of Sphingomonas sp. strain RW1 and Burkholderia sp. strain JWS

Article Abstract:

Microbiological research shows the mineralization of the polyhalogenated dibenzofuran 4-chlorodibenzofuran using a coculture of dibenzofuran-degrading bacterium Sphingomonas sp. strain RW1 and the chlorosalicy-late-degrading bacterium Burkholderia sp. strain JWS (13,15). The complete degradation of 4-chlorodibenzofuran with concomitant release od Cl- and formation of biomass is observed.

Methanobacteriaceae, Methanogens, Biomineralization

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