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. 2014 Nov 20;4:7126. doi: 10.1038/srep07126

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(a) Pictorial representation of the proposed hypothesis that streamers form as viscous liquid jets. (b) We show green fluorescent bacteria forming a streamer (demarcated by dashed ellipses). Flow is from top to bottom as shown by arrow. Scale bar is 20 μm (experimental set up identical to that of Valiei et al.¹⁷). Streamers form several hours after the start of formation of the biofilms and directional growth is not observed. Also the biofilms employed here are formed from Pseudomonas fluorescence bacterium – these biofilms are considered to have viscoelastic relaxation time of a few minutes.