DEGRADATION OF CARBAZOLE, DIBENZOTHIOPHENE, AND DIBENZOFURAN AT LOW TEMPERATURE BY PSEUDOMONAS SP. STRAIN C3211

摘要

Pseudomonas sp. strain C3211 was isolated from a temperate climate soil contaminated with creosote. This strain was able to degrade carbazole, dibenzothiophene and dibenzofuran at 10℃ with acetone as a co-substrate. When dibenzothiophene was degraded by strain C3211, an orange compound, which absorbed at 472 nm, accumulated in the medium. Degradation of dibenzofuran was followed by accumulation of a yellowish compound, absorbing at 462 nm. The temperature optimum of strain C3211 for degradation of dibenzothiophene and dibenzofuran was at 20 to 21℃, while the maximum temperature for degradation was at 27℃. Both compounds were degraded at 4℃. Degradation at 10℃ was faster than degradation at 25℃. This indicates that strain C3211 is adapted to life at low temperatures.