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This work focuses on several approaches to modulated control release systems, including polymers responding to external stimuli (pH glucose concentration), polymer drug-magnetic and ultrasonic systems. This book is aimed at the next generation of drug delivery systemsópumps that can be activated to provide different rates, polymers responding to pH stimuli, non-erodible polymers containing enzymes that cause the polymer to swell and regulate the rate of delivery in response to external stimuli, lectin drug systems that release additional drug due to the affinity of an external molecule for the lectin, and release of vesicle-entrapped substances in response to changes in environmental conditions. This reference shows that drug delivery patterns can be further optimized by pulse or self-regulated delivery, adjusted to the staging of biological rhythms. Written in a systematic format, this book is a useful resource for those involved with pharmaceutical sciences, biomedical materials research, chemistry, macromolecules, and chemical engineering.