Half-adder or Full-adder

An implementation of a half-adder or full-adder: 1-bit adder with carry

Idea: Pattern recognition

Main Goal:

Write something with a chemical on a petri plate (like ETH for example)
Let Bacteria grow uniformly on the plate
Expose the plate to a picture (black and white) of the same pattern
Result:
- Bacteria gets green when pattern on the plate and picture match (light and chemical)
- Bacteria does not express fluorescent protein when pattern on the plate and picture match (no light and no chemical)
- Bacteria gets red when pattern on the plate and picture do not match

Implementation from the ingenieur point of view

Implementation from the biologist point of view

AND Gate: presence of chemical induces the production of an inactive protein, which is activated by a second protein (produced when light is present): the first protein is then activating GFP production
XOR Gate: I think Marko had a good idea about that (I didn't really got it)
a light sensible promoter (there are some)
a chemical sensible promoter (chemical to be defined)
we would need to give a kind of first signal to the system (to don't have light reactions before a certain moment, otherwise we have to work in a dark room...), an activation signal after the bacterias have grown on the plate

Illustration of the above concepts: sliles (pdf, 352KB), handout (pdf, 268KB)