| http://www.w3.org/ns/prov#value | - The barrier or fluid flow modulator can comprise a material having the formula: wherein: A, G, and Q are each independently a single bond, O, N, R1, R2, R4, and R5 are each independently H, OH, NH2, CH3, C2H5, OCH3, OC2H5, CH2OH, ???(???CH2CH2O???)n???H, CH2CH2CH2NH2, CH2CO2H, CgH2g???1, or CnHn+1; R9, R10, R11, R12, R13, and R14, are each independently O, S, or NH; f is an integer from 1 to about
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