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Micro and Nano Systems Letters
Fig. 2 | Micro and Nano Systems Letters

Fig. 2

From: In vitro quantitative analysis of Salmonella typhimurium preference for amino acids secreted by human breast tumor

Fig. 2

Multiple chemical gradients generator for in vitro chemotaxis assay. a Schematic illustrations of fabrication process for multi-height PDMS microfluidic channels. b Microscopic images of fabricated multi-height PDMS microfluidic channels. c Time sequence microscopic images for in situ formation of microspheres assembly within the shallow channel. d Picture of fabricated device and its magnified microscopic images. e Fluorescence images of generated FITC gradients to the three different directions. f Representative plots for corresponding normalized fluorescence intensity

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