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Related Concept Videos

Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...
Modified-Release Drug Delivery Systems: Rate-Programmed I01:22

Modified-Release Drug Delivery Systems: Rate-Programmed I

Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...
Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

Modified-Release Drug Delivery Systems: Rate-Programmed II

Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
Modified-Release Drug Delivery Systems: Classification01:23

Modified-Release Drug Delivery Systems: Classification

Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...
Parenteral Drug Delivery Systems: Injectables, Implants, and Infusion Devices01:28

Parenteral Drug Delivery Systems: Injectables, Implants, and Infusion Devices

Parenteral drug delivery systems play a crucial role in modern therapeutics by enabling the direct administration of drugs into the systemic circulation, bypassing the gastrointestinal tract. These systems are particularly valuable for poorly absorbed oral medications that are unstable in the digestive environment or require rapid onset or sustained therapeutic levels. Delivery is achieved through intravenous, intramuscular, or subcutaneous routes, each selected based on the drug's properties...
Intrauterine Drug Delivery Systems01:21

Intrauterine Drug Delivery Systems

Controlled-release systems for intravaginal and intrauterine drug delivery have been developed primarily for the administration of contraceptive steroid hormones. These delivery routes circumvent first-pass hepatic metabolism, thereby enhancing bioavailability and allowing for reduced systemic dosages compared to oral administration. Such approaches contribute to improved therapeutic efficacy and patient compliance, particularly in long-term contraceptive regimens.Intravaginal Drug Delivery...

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Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks
07:50

Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks

Published on: November 25, 2015

DNA-based intelligent logic controlled release systems.

Yongqiang Wen1, Liping Xu, Chuanbao Li

  • 1Research Center for Bioengineering & Sensing Technology, University of Science and Technology Beijing, Beijing 100083, China. wyq_wen@iccas.ac.cn

Chemical Communications (Cambridge, England)
|July 18, 2012
PubMed
Summary
This summary is machine-generated.

DNA logic gates were created to control the release of gold nanoparticles. This demonstrates intelligent, stimulus-responsive material organization for advanced applications.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Nanotechnology

Background:

  • DNA nanotechnology enables the construction of complex molecular architectures.
  • Logic gates are fundamental components in computation and control systems.
  • Controlled release systems are crucial for targeted delivery and smart materials.

Purpose of the Study:

  • To fabricate DNA assemblies capable of performing Boolean logic operations (OR and AND).
  • To demonstrate the feasibility of intelligent, logic-controlled release of nanoparticles.
  • To investigate stimuli-induced structural transformations in DNA ensembles for material organization.

Main Methods:

  • Fabrication of DNA assemblies designed for logic gate functions.
  • Utilizing stimuli-responsive structural changes in DNA ensembles.
  • Controlled organization of gold nanoparticles onto mesoporous silica surfaces.

Main Results:

  • Successfully created DNA assemblies exhibiting OR and AND logic gate functionalities.
  • Demonstrated controlled release of gold nanoparticles based on DNA logic operations.
  • Showcased stimuli-induced structural transformation of DNA ensembles to direct nanoparticle organization.

Conclusions:

  • DNA logic gates can effectively control the organization and release of nanoparticles.
  • This work presents a novel approach for developing intelligent, stimuli-responsive materials.
  • The findings pave the way for advanced applications in sensing, drug delivery, and molecular computing.