It is particularly preferred that the device be formed totally or in part of one or more of biopolymers having recurring unit of the Structure II or III in which R1, R2, R3, R4, R5 and R6 are the same or different and are hydrogen, aryl or alkyl, alkylaryl having from 7 to about 14 carbon atoms such as tolyl or phenyl; or lower alkyl of from 1 to about 7 carbon atoms such as methyl, ethyl, propyl,