โ Scribed by Todd L. Mathus; David E. Townsend; Kathleen W. Miller
No coin nor oath required. For personal study only.
Biological production of p-cresol occurred in an anaerobic medium containing protein after the medium was inoculated with material from one of several anaerobic systems, including swine waste, petroleum-contaminated sediment, municipal sewage sludge and pristine pond sediment. Addition of the amino acid L-tyrosine was accompanied by an increase in p-cresol concentration and the appearance of phenol. When a defined medium containing [U-'4C]L-tyrosine was inoculated with petroleumcontaminated sediment, radioactivity recovered as phenol and p-cresol accounted for 4.6% and 22% of the original, respectively, showing that L-tyrosine was a precursor for both compounds. The results indicate that microorganisms that degrade L-tyrosine with the production of phenol or g-cresol occur in widely diverse anaerobic systems. The question is raised of whether phenol and p-cresol from this source could mimic low-level petrochemical pollution.
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