The use of DNA molecules to encode computational problEMS. Standard operations of molecular biology can then be used to solve some NP-hard {search problEMS} in parallel using a very large number of molecules. The exponential scaling of NP-hard problEMS still remains, so this method will require a huge amount of DNA to solve large problEMS. [L. M. Adleman, "Molecular Computation of Solutions to Combinatorial ProblEMS", Science 266:1021-1024, 1994]. (1997-02-11)