Cargo carrying bacteria at interfaces†,Soft Matter

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Cargo carrying bacteria at interfaces†
Soft Matter ( IF 2.9 ) Pub Date : 2018-06-13 00:00:00 , DOI: 10.1039/c8sm00481a
Liana Vaccari _{1,

2,

3,

4} , Mehdi Molaei _{1,

2,

3,

4} , Robert L. Leheny _{4,

5,

6,

7} , Kathleen J. Stebe _{1,

2,

3,

4}

Affiliation

The displacements of ensembles of colloids at the interface between oil and suspensions of the bacterium Pseudomonas aeruginosa PA14ΔpelA indicate enhanced colloid mobilities and apparently diffusive motion driven by interactions with the bacteria. However, inspection of individual trajectories of ∼500 particles reveals prolonged, directed displacements inconsistent with purely hydrodynamic interactions between swimming bacteria and colloids. Analysis of the properties of colloid paths indicates trajectories can be sorted into four distinct categories, including diffusive, persistent, curly, and mixed trajectory types. Non-diffusive trajectories are the norm, comprising 2/3 of the observed trajectories. Imaging of colloids in the interface reveals anisotropic assemblies formed by colloids decorated with one or more adhered bacteria that drive the colloids along these paths. The trajectories and enhanced transport result from individual colloids being moved as cargo by these adhered bacteria. The implications of these structures and open questions for interfacial transport are discussed and related to the active colloid literature.

中文翻译：

界面处载有细菌的货物†

胶体的合奏中的油和细菌的悬浮液之间的界面处的位移绿脓杆菌PA14Δ PELA表明通过与细菌的相互作用驱动胶体运动性增强和明显的扩散运动。但是，对约500个粒子的单个轨迹进行检查后发现，定向的位移较长，与游泳细菌和胶体之间的纯粹流体动力相互作用不一致。对胶体路径性质的分析表明，轨迹可以分为四个不同的类别，包括扩散，持久，卷曲和混合轨迹类型。非扩散轨迹是常态，包括所观察轨迹的2/3。界面中胶体的成像显示由装饰有一种或多种粘附细菌的胶体形成的各向异性组件，这些细菌会沿着这些路径驱动胶体。轨迹和增强的运输是由于单个胶体被这些附着的细菌作为货物移动而产生的。这些结构和界面运输的开放性问题的含义进行了讨论，并与活性胶体文献有关。

更新日期：2018-06-13

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