弹性柱撑微结构中的细菌足迹
Bacterial Footprints in Elastic Pillared Microstructures
摘要：
已知用微柱阵列装饰的软基底由于毛细作用而对偏转敏感。在这项工作中，我们证明微柱环氧树脂表面是敏感的单滴细菌悬浮液。微柱在蒸发时可以显示出显著的变形，就像在软基底中的毛细作用一样。用五种细菌菌株S. epidermidis，L. sakei、铜绿假单胞菌（P.aeruginosa）、E.杆菌和枯草枯草杆菌。结果表明，只有含有鞭毛的能动微生物的液滴刺激微柱弯曲，这导致显着的扭曲和柱聚集形成二聚体，三聚体和更高阶的集群。这种变形表现在蒸发后留在微阵列表面上的特征图案中，并且甚至可以通过肉眼容易地识别。我们的研究结果可以为设计和制造对特定类型微生物敏感的机械响应基底奠定基础。
英文摘要：
Soft substrates decorated with micropillar arrays are known to be sensitive to deflection due to capillary action. In this work, we demonstrate micropillared epoxy surfaces are sensitive to single drops of bacterial suspensions. The micropillars can show significant deformations upon evaporation, just as capillary action does in soft substrates. The phenomenon has been studied with five bacterial strains S. epidermidis, L. sakei, P. aeruginosa, E. coli and B. subtilis. The results reveal that only droplets containing motile microbes with flagella stimulate micropillar bending, which leads to significant distortions and pillar aggregations forming dimers, trimers, and higher order clusters. Such deformation is manifested in characteristic patterns that are left on the microarrayed surface following evaporation, and can be easily identified even by the naked eye. Our findings could lay the ground for the design and fabrication of mechanically responsive substrates, sensitive to specific types of microorganisms.
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