Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The sustained release of macromolecules is achieved by incorporation in reservoir or matrix systems. (a) Delivery from a reservoir system can be tailored by adjusting the properties of the rate-controlling membrane including thickness and porosity. (b) Delivery from a matrix system representing uniform initial distribution throughout the polymer phase
