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Effect of Bacterial Cell Shape on Transport of Bacteria in Porous Media

机译：细菌细胞形状对细菌在多孔介质中运输的影响

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摘要

Parameters used to describe the transport of colloids (including bacteria) through porous media either implicitly or explicitly account for colloidal particle size but assume that the particles are spheres of uniform size. Bacteria found in soils and in aquifers exhibit a variety of shapes as well as sizes. We sought to determine if there exists a systematic effect of cell shape on the transport of bacteria in columns packed with clean quartz sand. A pulse of resting cells (14 strains of bacteria isolated from aquifers) suspended in an artificial groundwater was passed through a short column. Properties of the bacteria in the influent pulse were compared with those in the eluent from the columns. Cell shape, as quantified by the ratio of cell width to cell length, affects the transport of bacterial cells through porous media. In addition, the distributions of size and shape of cells in the effluent differed from those in the influent suspension with cells in the effluent being smaller and rounder. Short rods with low water contact angles (a measure of cell-surface hydrophobicity) showed the greatest decrease in cell length during passage through short columns.
机译：用于描述胶体（包括细菌）通过多孔介质的传输的参数隐式或显式地说明了胶体粒径，但假定这些粒子是大小均一的球体。在土壤和含水层中发现的细菌具有各种形状和大小。我们试图确定在装有干净石英砂的色谱柱中，细胞形状对细菌运输是否存在系统性影响。悬浮在人造地下水中的静止细胞脉冲（从含水层中分离出的14个细菌菌株）通过短柱。将进水脉冲中细菌的特性与色谱柱洗脱液中的细菌特性进行了比较。用细胞宽度与细胞长度之比来量化的细胞形状会影响细菌细胞通过多孔介质的转运。另外，流出物中细胞的大小和形状的分布不同于流入悬浮液中的细胞的大小和形状，其中流出物中的细胞更小且更圆。低水接触角的短杆（衡量细胞表面疏水性的指标）在穿过短柱的过程中显示出细胞长度的最大减少。

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