Abstract
An aerobic bacterium, Ralstonia sp. strain TRW-1, that assimilates vinyl chloride (VC) or ethene (ETH) as the sole carbon source was isolated from a chloroethene-degrading enrichment culture. Phylogenetic analysis of 16S rDNA sequence of the isolate revealed almost 99% sequence similarity to Ralstonia pickettii. To our knowledge, this is the first report describing the isolation of a member of Ralstonia that can degrade VC as the growth substrate. The measured growth yield values for VC and ETH were 11.27 and 18.90 g protein/mole, respectively. The estimated half-velocity constant K (m) values for VC and ETH were 9.09+/-2.97 and 5.73+/-2.96 muM, respectively. These values are almost three- to tenfold higher than for other VC-assimilating Mycobacterium sp. The strain also degrades cis-dichloroethene (cis-DCE) in mineral salts medium containing yeast-extract, beef-extract, casamino acids, or peptone. This ability of the strain TRW-1 to degrade cis-DCE in the presence of a nontoxic, water-soluble substrate is relevant to in-situ remediation of cis-DCE-contaminated aquifers.
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