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通过剪切和波动在动荡环境中调节生物膜生长

Federico Pizzi¹, Francesc Peters², Elena Sorribes³

¹Department of Fluid Mechanics, Universitat Politècnica de Catalunya ⋅ BarcelonaTech (UPC), Barcelona, 08019, Spain.

Scientific reports

|April 11, 2025

概括

动荡会影响微塑料 (MP) 上的生物膜生长. 高剪率可以侵蚀生物膜,而在低剪率环境中,营养物质的可用性限制了生长,影响了海洋中的MP命运.

科学领域:

环境科学环境科学
流体动力学流体动力学
微生物学微生物学

背景情况:

微塑料 (MP) 上的生物膜增强了颗粒的聚合和沉降,影响了它们在海洋环境中的命运.
了解海洋流条件下的生物膜动态对于准确的MP运输建模至关重要.

研究的目的:

研究剪切和动波动对多种生物膜在塑料表面生长的影响.
阐明在不同流动模式下控制生物膜形成和生物质积累的机制.

主要方法:

实验室实验使用振荡网格系统来产生受控的流 (雷诺德数305-2220).
两种配置:剪切主导 (移动样本) 和无剪切 (固定样本).
生物质测量,扫描电子显微镜,和一个物理模型,包括莫诺德动力学和流扩散.

主要成果:

生物膜质量最初在剪切主导的条件下随着流的增加而增加,然后由于侵蚀而减少.
在无剪切条件下,生物膜质量随着营养的可用性而增加,并且由于吸收动力学而和.
流增加了生物膜集群的紧性,通过扫描电子显微镜观察到.

结论:

流和剪切显著影响生物膜生长模式和微塑料上的生物质积累.
这些发现为生物膜介导的MP聚合和沉没提供了洞察力,改善了MP运输的预测.
开发的物理模型准确地描述了在无剪切的动荡条件下生物膜的生长.

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