a method of producing an improved cell growth surface and cell attachment surface . according to the present invention , a polymer article is molded at temperature in excess of 550 ° f . at the injection tip . after allowing the part to cool , a stream of plasma comprised of activated gaseous species generated by a microwave source is imparted on the article . this stream is directed at the surface of a polymer substrate in a controlled fashion such that the surface is imparted with attributes for cell adhesion superior to those of untreated polymer or polymer treated by other methods .