| http://www.w3.org/ns/prov#value | - One method developed for timed or controlled release is by means of matrix devices in which a solute to be delivered is compounded into a matrix, generally a polymer such as cellulose esters, polyvinylchloride, polytetrafluoroethylene, polypropylene, polycarbonate, polyethylene, polystyrene, and nylon, and which may be in the form of a flat sheet The solute agent is then released from the matrix b
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