Effect of nutrients on the rates of mineralization of trace concentrations of phenol and p-nitrophenol

Carbon source-dependent inhibition of xyl operon expression of the Pseudomonas putida TOL plasmid

“…The respective catabolic pathways have generally been analyzed under conditions in which the target compound is present as the sole growth-supporting substrate. In nature, however, mixtures of potential growth substrates are often present, and a more favorable substrate may be degraded to the detriment of the desired degradative activity (19,21). The phenomenon of certain carbon sources repressing the utilization of less favorable substrates (catabolite repression) has been well described for enteric bacteria (6) and a few genera, such as Bacillus (10) and Pseudomonas (9,14).…”

Aerobic microbial transformation of pesticides in surface water

“…1 ppt to the ppm level, 78,138) and the maximum specific growth rate of degrading microbes increased with the concentration. 56) However, Rubin and Alexander 139) found a smaller mineralization rate at <1 ppt than expected from the relationship. These authors pointed out the participation of different microbes depending on the trophic level of water, and they concluded that the slower energy gain at a lower concentration may not meet the demand by the small population of degrading microbes.…”

Technical Approach for In Situ Biological Treatment Research: Bench- Scale Experiments

“…Organic and inorganic nutrients in natural waters are known to affect the rate of mineralization of compounds in trace concentrations (Rubin and Alexander 1983), and this may also be true for low levels of organic contaminants in the soil. Rubin and Alexander found that inorganic nutrients, arginine, or yeast extract often enhanced, but glucose reduced the rate of phenol mineralization.…”