>> show the evolution of oxygen from cyanobacteria in an
> analogous manner that aquatic plants like Elodea are used. Has
> anybody tried this or have any thoughts of how to do it?
>Go to www.google.com or any other search engine, and search for e.g. "oxygen
evolution cyanobacteria bioreactor". There's a bunch of links you can pull
out. Note though that cyanobacteria will also produce hydrogen gas in
addition to oxygen, which is a potential fire hazard and might not be
allowed for exibition purposes. Generally, growing cyanobacteria on mineral
medium with bicarbonate as a sole carbon source with high illumination
should to the trick for you. Just attack the tubing to the flask with one
end, and put another end in the beaker with water. The media compositions
can be checked in original publications.