AFAIK ... you can't in the standard game {linka}
But, you could mod a intermediate tech, that has a unique tech prereqisite. Then, a captured ship for a race that had the unique tech could be analyzed for the dependant tech, which could be researched further, etc.
As I recall, adding tech's like this can kinda screw up the research tree.
[ October 25, 2003, 16:29: Message edited by: Arkcon ]