Wood Preservation Sites Chlorophenolic Compounds

PART 3 WOOD PRESERVATION SITES CHLOROPHENOLIC COMPOUNDS 

Some general microbiological issues are briefly summarized in addition to details that are given in Chapter 9, Part 2. 

In the application of snch strains to bioremediation of contaminated sites, a nnmber of important considerations shonld be considered. 

The tolerance of the strains to high concentrations of pentachlorophenol—S. chlorophenolica appears to be less sensitive than M. chlorophenolicus (Miethling and Karlson 1996). This may be attribnted to the ability of the cells to adapt their metabolism to avoid synthesis of toxic concentrations of chlorinated hydroquinones, and is consistent with the low levels of these metabolites measnred in the cytoplasm of cells metabolizing pentachlorophenol (McCarthy et al. 1997). Inocnla have also been immobilized on polyurethane that, in addition, ameliorates the toxicity of chlorophenols (Valo et al. 1990). 

The longevity of the strains in the environment. This is dramatically illustrated from the observations that an initial inoculum of 10 cells/g of S. chlorophenolica fell to zero within 7 months, whereas 10 -10 cells/g of M. chlorophenolicum could be recovered from a similar inoculum after 7 months (Miethling and Karlson 1996). 

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