Defluorination of sodium monfluoroacetate (1080) by microorganisms isolated from Western Australian soils
1992
Soils from four sites, two with and two without previous exposure to sodium monofluoracetate (1080), in Western Australia were investigated to determine whether they contained microorganisms capable of defluorinating 1080. Most samples from these four sites showed microbial defluorination activity. A number of species of bacteria and fungi were isolated; Aspergillus fumigatus, Fusarium oxysporum, Pseudomonas acidovorans, Pseudomonas fluorescens 1, an unidentified Pseudomonas sp., Penicillium purpureseens and Penicillium restrictum. These seven microorganisms possessed the ability to defluorinate 1080 when grown in a 1080 solution, which was the sole carbon source, and also in autoclaved soil. The amount of defluorination varied with different species of microorganisms, ranging from 2 to 85% in soil and from 2 to 89% in 1080 solutions. A time-course experiment showed that some indigenous soil microflora were able to defluorinate over 50% and up to 87% of the 1080 within 5-9 days in soil with a moisture content of about 10% when kept at 28 degrees C (day) and 15 degrees C (night). Soils from four other arid or semiarid sites were also investigated for the presence of thermophilic microorganisms with 1080 defluorinating ability. No thermophilic microorganisms were isolated.
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