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Changes in microbiological metabolism under chemical stress
Sujata Ray1, Catherine A Peters
1Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544, USA.
Chemosphere
|February 12, 2008
Summary
Chemicals like DNP, PCP, and NEM disrupt microbial metabolism. Even at low levels, these stressors reduce growth yields and, at higher concentrations, inhibit substrate use, impacting biological systems.
Area of Science:
- Microbiology
- Environmental Science
- Biochemistry
Background:
- Chemical stressors can significantly alter microbial metabolism.
- Understanding these effects is crucial for managing natural and engineered biological systems.
Purpose of the Study:
- To investigate the impact of specific chemical stressors on the metabolic activity of *Pseudomonas aeruginosa*.
- To quantify the effects of 2,4-dinitrophenol (DNP), pentachlorophenol (PCP), and N-ethylmaleimide (NEM) on microbial growth and substrate utilization.
Main Methods:
- *Pseudomonas aeruginosa* was cultured in batch systems under varying sub-lethal concentrations of DNP, PCP, and NEM.
- Biomass growth yields and substrate utilization rates were measured to assess biological activity.
Main Results:
- Sub-lethal concentrations of DNP and PCP reduced biomass growth yields by up to 10%, indicating resource diversion to stress responses.
- Higher concentrations of DNP and PCP inhibited both growth yields and substrate utilization rates, suggesting catabolic and anabolic inhibition.
- N-ethylmaleimide (NEM) proved to be the most potent stressor, inhibiting biological activity at concentrations as low as 2.7 mg/L.
Conclusions:
- Chemical stressors differentially impact microbial metabolism, affecting growth and substrate utilization.
- Findings provide insights for monitoring and managing biological treatment processes and contaminated environments.
- The study highlights the varying potency of different chemical stressors on microbial function.
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