From 2007.igem.org

An actual demonstration is determined to show the extensibility of our method. This demo system • is designed as simple as possible, without any "cool" logic function; • includes all the three logic gates, which constitute a three-level logic circuit; • shows that wires can cross and branch off (without interference); • is loaded on two plasmids, pSB1A3-I732998 and pSB1A3-I732999 ,and practically transformed into Top10 strain; • accepts aTc and AHL signals as inputs; • produces RFP and GFP signals as outputs; • can be "reset" by IPTG signal (i.e. both of the outputs are lightened when IPTG added in); • is expected to put out the results that accord with the truth value shown in Figure 2.

Logic Abstract of the Demo

We can see from this truth table that IPTG might result in both outputs lightened no matter aTc or AHL exists or not. (It is just like the response "8888..." on the screen when you reset one of your digital equipment, for example, a calculator.)

Actual System

The three parts on the left are loaded on pSB1A3-I732998, and the rest two parts are loaded on pSB1A3-I732999. We've built up this system in one kind of TOP10 E.coli, but it seems that it cannot grow stably when aTc exists. (We have to use aTc at a high concentration for the sake of the high expression of LuxR.) The very final results here may not be able to show on time by Oct. 26, but we have continually been trying our best to screen out such a monoclonal strain. You will get the results in the coming presentation...