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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Stability of Bacterial Coaggregates in Extreme Environments
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Stability of Bacterial Coaggregates in Extreme Environments

机译：极端环境下细菌聚集体的稳定性

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The stability of coaggregates formed by the interaction of Acinetobacter johnsonii S35 and Oligotropha carboxidovorans S23, both of which are nonflocculating sludge bacteria, was evaluated by a spectrophotometric assay of aggregation index and phase contrast microscopy. Exposure of coaggregates to conditions of various pH (3–11) or temperature (10–50°C) did not cause significant deflocculation and high aggregation index (85–93%) was still maintained as compared to 93.3% under normal conditions. Further, heat pretreatment of A. johnsonii S35 and O. carboxidovorans S23 cells at 60 or 80°C did not prevent their subsequent coaggregation indicating that the interacting cell surface structures are heat-resistant. However, dual exposure of coaggregates to low temperature (10°C) and extreme pH caused disruption of coaggregates coupled with the reduction in aggregation index below 28% (pH 3) and 49% (pH 11). Use of sterile filtrate of settled sewage (SFSS) in place of electrolyte solution as coaggregating medium produced usual large coaggregates (above 100 m) indicating reproducibility of this coaggregation in sewage treatment plants. SFSS coaggregates incurred lesser deflocculation (50 and 85%, respectively) at extreme pH (3 and 11, respectively) and low temperature. This study demonstrated that although bacterial coaggregates are strong and stable against individual pH or temperature stress, a dual stress might deteriorate the performance and quality of treated waters.
机译：通过分光光度法测定聚集指数和相差显微镜，评估了由不动杆菌污泥细菌约翰逊不动杆菌S35和碳氧化寡糖S23相互作用形成的聚集体的稳定性。聚集体暴露于各种pH（3-11）或温度（10–50°C）的条件下不会引起明显的絮凝，并且仍保持高聚集指数（85–93％），而正常条件下为93.3％。此外，在60或80°C下对约翰逊A. S35和carboxidovorans S23细胞进行加热预处理不会阻止它们随后的聚集，这表明相互作用的细胞表面结构具有耐热性。然而，将共聚体两次暴露于低温（10°C）和极端pH值会导致共聚体的破坏，同时聚集指数降低到低于28％（pH 3）和49％（pH 11）。使用无菌的沉降污水滤液（SFSS）代替电解质溶液作为集聚介质可以产生通常的大集聚体（大于100 m），表明该集聚在污水处理厂中具有可重复性。 SFSS聚集体在极端pH（分别为3和11）和低温下产生的反絮凝作用较小（分别为50和85％）。这项研究表明，尽管细菌聚集体对个别的pH或温度胁迫具有较强的稳定性，但双重胁迫可能会使处理过的水的性能和质量下降。

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