The components and interactions of a functional region, which is defined by the areal extent of those interactions. Functional region A region marked less by its sameness than its dynamic internal structure; because it usually focuses on a central node, also called nodal region or focal region.
A single syringe pump delivers sample/reagents to the chip for nucleic acid purifn. from a biol. sample. Elastomeric membrane valving isolates each distinct functional region of the device and, together with resistive flow, directs purified DNA and PCR reagents from the extn. domain into a 550-nl chamber for rapid target sequence PCR amplification.