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. Author manuscript; available in PMC: 2020 Oct 13.
Published in final edited form as: J Vis Exp. 2019 Oct 13;(152):10.3791/60415. doi: 10.3791/60415

Figure 2: Establishing chemical gradient.

Figure 2:

(A) Fluorescence images of rhodamine B-conjugated dextran (70 kDa) visualized the concentration gradient of the molecule under the fluid flow of 0.125, 0.5 and 2 μl/min. (B) The intensity profile of the fluorescence image showed that the concentration gradient in the device is adjustable by the flow rate. The error bars indicate standard deviations.