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首页> 外文期刊>Environmental toxicology and chemistry >ADAPTATIONS IN MICROBIOLOGICAL POPULATIONS EXPOSED TO DINITROPHENOL AND OTHER CHEMICAL STRESSORS
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ADAPTATIONS IN MICROBIOLOGICAL POPULATIONS EXPOSED TO DINITROPHENOL AND OTHER CHEMICAL STRESSORS

机译：双酚和其他化学应激菌对微生物种群的适应

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摘要

Microbiological populations in natural and engineered systems may experience multiple exposures to chemical stressors, which may affect system functions. The impact of such exposures on the metabolism of a population of Pseudomonas aeruginosa was studied using respirometry. Two serial exposures to low concentrations of 2,4-dinitrophenol (DNP), pentachlorophenol (PCP), or N-ethyl maleimide (NEM) did not affect metabolism beyond that expected for a single exposure. However, at higher concentrations, three exposures to DNP led to a combination of metabolic stress and resilience in the population. At a low DNP concentration of 400 mg/L, multiple exposures led to increased stress but indicated no development of resilience. At a high DNP concentration of 1,200 mg/L, no biological activity was observed, indicating that the population did not survive the exposure. At intermediate concentrations of 800 and 900 mg/L DNP, stress was observed, but it was found to decrease after multiple exposures. This, combined with the observation that the size of the population decreased, indicated that resilience in the population had developed because of elimination of the weaker organisms in the population. In contrast, the lack of resilience at the lower DNP concentration was attributed to the survival of the strong as well as weak members, lowering the resilience of the population as a whole. The development of resilience within a window of stressor concentrations is an important finding with implications for predicting the performance of biotreatment processes and biosensor technologies and for interpreting ecotoxicity risk assessments.
机译：自然和工程系统中的微生物种群可能会遭受化学应激源的多次暴露，这可能会影响系统功能。使用呼吸测定法研究了此类暴露对铜绿假单胞菌种群代谢的影响。两次连续暴露于低浓度的2,4-二硝基苯酚（DNP），五氯苯酚（PCP）或N-乙基马来酰亚胺（NEM）不会影响代谢，超出一次暴露的预期。但是，在较高的浓度下，三倍暴露于DNP会导致人群中的代谢压力和恢复力共同作用。在400 mg / L的低DNP浓度下，多次接触导致压力增加，但未显示出恢复力。在1,200 mg / L的高DNP浓度下，未观察到生物活性，表明该种群无法幸免于暴露。在800和900 mg / L DNP的中间浓度下，观察到了压力，但是发现在多次暴露后压力有所降低。这与观察到种群数量减少的观察结果相结合，表明由于消除了种群中较弱的生物，种群的适应力得到了发展。相反，在较低的DNP浓度下缺乏弹性的原因是强成员和弱成员的生存，从而降低了总体人口的弹性。在应激源浓度范围内恢复力的发展是一项重要发现，对预测生物处理过程和生物传感器技术的性能以及解释生态毒性风险评估具有重要意义。

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