用含有清胺的经过处理的废水灌的土壤抗性和微生物群的时间动态
Oriane Della-Negra1, Marilia Camotti Bastos2, Valérie Bru-Adan1
1INRAE, University of Montpellier, LBE, Av. des Étangs, 11100, Narbonne, France.
Environmental research
|January 26, 2025
概括
在经过处理的废水中含有的克拉里思罗米可能会在土壤中持续存在,可能会增加抗生素耐药性. 这项研究确定了影响抗性基因的关键土壤度,这对于风险评估至关重要.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 土壤科学 土壤科学
背景情况:
- 抗生素克拉里素存在于废水中,可以通过灌进入土壤.
- 土壤中的抗生素残留物可能会推动抗生素耐药性基因的传播.
- 缺乏土壤特异性预测无效度 (PNEC) 阻碍了清红素的风险评估.
研究的目的:
- 为了调查克拉里菌素在土壤微观宇宙中的命运.
- 为了确定影响土壤微生物群落的克拉里素度值.
- 评估克拉里斯罗米对土壤中宏类耐药基因丰富性的影响.
主要方法:
- 通过处理废水 (TWW),在三个月的时间里,用克拉里斯罗米辛处理了土壤微观世界,度不同 (0-1 mg/kg干土).
- 监测了克拉利胺降解,转化产物和特定耐药基因 (intl1, mphA, ereA, ermB, mefA) 的丰富性.
- 分析了土壤细菌群体的组成,以评估TWW和澄菌素的影响.
主要成果:
- 克拉里胺在土壤中表现出持久性,降解程度有限,归因于强烈的吸附.
- 确定了两个转化产品,分拉丁-CLA和酸-CLA.
- 土壤细菌群体主要受到TWW的影响,由于吸附,克拉里思罗米的抗菌作用减少.
- 虽然一些耐药基因没有受到影响,但 ermB 在度>0.01 mg/kg时增加,而 mefA 则表现出抑制作用 (剂量依赖的增加/减少).
结论:
- 克拉里胺的持久性和吸附性影响其在土壤中的生物可用性和抗菌作用.
- 确定了特定的克拉里素度值,这些值会影响某些抗生素耐药基因的丰富性.
- 研究结果为开发土壤特异性PNEC和评估农业土壤抗生素污染相关风险提供了关键数据.
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