论文标题
通过细菌生长在液滴上的油性和分散
Tubulation and dispersion of oil by bacterial growth on droplets
论文作者
论文摘要
表面上的细菌表现出集体行为，例如主动湍流和主动应力，这是由于它们的运动，生长和与当地周围环境的相互作用所致。但是，尚不清楚由活性生长引起的软表面和液体界面的界面变形，尤其是在长时间尺度上，尚不清楚。在这里，我们描述了有关棒状细菌在水中油滴界面上生长引起的管状结构出现的实验观察结果。使用微流体和及时的显微镜，在72小时内对数百滴进行了数百滴的量化，单个管状结构的尺寸和延伸速率被定量数百滴。管状结构的长度与初始液滴半径相当，并由细菌的外壳组成，该细菌稳定了油的内部细丝。油丝分解成分散在细菌壳内的较小的微圆头。这项工作提供了对可变形界面处的主动应力的洞察力，并提高了我们对微生物油生物降解的理解及其对海洋水柱中液滴运输的潜在影响。
Bacteria on surfaces exhibit collective behaviors, such as active turbulence and active stresses, which result from their motility, growth, and interactions with their local surroundings. However, interfacial deformations on soft surfaces and liquid interfaces caused by active growth, particularly over long time scales, are not well understood. Here, we describe experimental observations on the emergence of tubular structures arising from the growth of rod-shaped bacteria at the interface of oil droplets in water. Using microfluidics and timelapse microscopy, the dimensions and extension rates of individual tubular structures as well as bulk bio-aggregate formation are quantified for hundreds of droplets over 72 hours. Tubular structures are comparable in length to the initial droplet radius and are composed of an outer shell of bacteria that stabilize an inner filament of oil. The oil filament breaks up into smaller microdroplets dispersed within the bacterial shell. This work provides insight into active stresses at deformable interfaces and improves our understanding of microbial oil biodegradation and its potential influence on the transport of droplets in the ocean water column.
