Team:ETH Zurich/Process/Validation

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Revision as of 19:20, 21 September 2011

Can you feel the smoke tonight?

Systems Validation

Diffusion-only System

A

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Validation Description

Figure 1: Experimental setup for the diffusion test in agarose filled tubes.

To validate that we can create a gradient of a small molecule along our agarose filled tube, we filled a tube (2 mm diameter, 7 cm long) with agarose and E. coli (see Figure 1). The E. coli cells were engineered to express an IPTG-inducible GFP. The cells were incubated at 37 °C overnight. One end of the tube was connected to a sample medium (1 ml) containing 10 mM IPTG solution.

Figure 2: GFP gradient in tube: E. coli with IPTG-inducable GFP were incubated in a tube (2 mm diameter, 7 cm long). GFP expression was assessed under the fluorescent microscope after overnight incubation, with a excitation wavelength of 480 nm and a emission wavelength of 510 nm. The 15 microscope photos were reassembled into one using [http://research.microsoft.com/en-us/um/redmond/groups/ivm/ICE/ the Microsoft Research Image Composite Editor].

Figure 3: Quantification of the gradient in Figure 2: The light intensity of the IPTG-induced GFP signal was quantified by a 80×80 pixel moving average. The peak at around 1.2cm is due to an air bubble in the channel (see Figure 2).

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 [[File:Setup_test.png|400px|left|thumb|'''Figure 1: Experimental setup for the diffusion test in agarose filled tubes.''' ]]
-To validate that we can create a gradient of a small molecule along our agarose filled tube, we filled a tube (2 mm diameter, 7 cm long) with agarose and ''E. coli''. The E. coli cells were engineered to express an IPTG-inducible GFP. The cells were incubated at 37 °C overnight. One end of the tube was connected to a sample medium (1 ml) containing 10 mM IPTG solution.
+To validate that we can create a gradient of a small molecule along our agarose filled tube, we filled a tube (2 mm diameter, 7 cm long) with agarose and ''E. coli'' (see Figure 1). The E. coli cells were engineered to express an IPTG-inducible GFP. The cells were incubated at 37 °C overnight. One end of the tube was connected to a sample medium (1 ml) containing 10 mM IPTG solution.
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