Re: what is a dialysis tube?

Hello-

A dialysis tube is a semipermeable membrane that allows molecules of a certain 
size to get in or out, while keeping molecules above that size in.  They are 
often used to remove impurities from preparations of proteins or other 
macromolecules, or to normalize pH of a preparation.

Here are some examples of dialysis membranes/tubing and uses of them:

http://www.bio.com/protocolstools/protocol.jhtml?id=p9054

http://www.piercenet.com/products/browse.cfm?fldID=040101


Hope this helps.
ILD
MadScientist