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Revision as of 10:21, 31 July 2006

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Half-adder or Full-adder

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

• [http://en.wikipedia.org/wiki/Full_adder half/full adder in wikipedia]

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

• Half Adder
• = opportunity to build an AND and an XOR Gate

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)

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