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Appl Environ Microbiol. 1990 November; 56(11): 3240-3246

Transformation of carbon tetrachloride by Pseudomonas sp. strain KC under denitrification conditions.

C S Criddle, J T DeWitt, D Grbi-Gali and P L McCarty

Environmental Engineering and Science, Stanford University, California 94305-4020.

ABSTRACT

A denitrifying Pseudomonas sp. (strain KC) capable of transforming carbon tetrachloride (CT) was isolated from groundwater aquifer solids. Major products of the transformation of 14C-labeled CT by Pseudomonas strain KC under denitrification conditions were 14CO2 and an unidentified water-soluble fraction. Little or no chloroform was produced. Addition of dissolved trace metals, notably, ferrous iron and cobalt, to the growth medium appeared to enhance growth of Pseudomonas strain KC while inhibiting transformation of CT. It is hypothesized that transformation of CT by this organism is associated with the mechanism of trace-metal scavenging.

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