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Related Concept Videos

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PD Controller: Design

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In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
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Proportional Integral (PI) controllers are a fundamental component in modern control systems, widely used to enhance performance and mitigate steady-state errors. They are particularly effective in applications such as automatic brightness adjustment on smartphones, where they excel at mitigating steady-state errors for step-function inputs. Unlike PD controllers, which require time-varying errors to function optimally, PI controllers leverage their integral component to address residual...
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Drug Delivery: Overview01:16

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The selection of a drug's delivery route depends upon its physicochemical properties, including lipid or water solubility and ionization, as well as the therapeutic requirement, such as immediate or sustained effect. These routes can be divided into three primary categories: enteral, parenteral, and topical.
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Factors Influencing Drug Absorption: Anatomical Parameters01:23

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Drug absorption involves the movement of drugs from the point of administration into the systemic circulation. Initially, Gastrointestinal (GI) motility propels the drug through the digestive tract and into the stomach. However, the stomach's high acidity and limited surface area restrict its role in drug absorption for most drugs. The drug then moves from the stomach to the small intestine via gastric emptying, which can be slowed by various factors, including interactions with other...
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The physicochemical characteristics of drugs play a crucial role in formulating stable and bioavailable drug products. The solubility of a drug, governed by the varying pH along the GI tract and its dissociation constant (pKa), is pivotal in determining its ionization state and absorption rate. Notably, weak acids and bases remain unionized and are absorbed more rapidly.
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Solid dosage forms such as tablets and capsules undergo rigorous manufacturing processes to ensure stability and effectiveness. Their dissolution and absorption properties are influenced significantly by the choice of excipients (inactive ingredients that serve various roles in the formulation), and the methodology applied during production. The manufacturing parameters, such as compression force and granulation techniques, significantly affect dissolution rates. Elevated compression forces...
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Related Experiment Video

Updated: Feb 7, 2026

Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications
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Design parameter effects on controlled drug delivery through implantable hydrogels.

Benita Jowell1, Wenbo Zhan2

  • 1School of Engineering, University of Aberdeen, Aberdeen, AB24 3UE, UK.

Drug Delivery and Translational Research
|February 5, 2026
PubMed
Summary

Mathematical modeling reveals that post-surgical edema significantly impacts drug delivery for glioblastoma (GBM) recurrence. Optimizing hydrogel and drug properties, alongside edema characteristics, is crucial for effective residual GBM cell elimination.

Keywords:
Cancer recurrenceChemotherapyDrug transportHydrogelMathematical model

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Area of Science:

  • Biomedical Engineering
  • Pharmacology
  • Oncology

Background:

  • Glioblastoma (GBM) recurrence post-surgery is a primary cause of mortality, often near the tumor margin.
  • Hydrogels are used to fill surgical cavities and deliver drugs to eliminate residual GBM cells.
  • The influence of tissue, hydrogel, and drug properties on drug delivery efficacy is not well understood.

Purpose of the Study:

  • To investigate the impact of tissue, hydrogel, and drug properties on drug delivery outcomes for preventing glioblastoma recurrence.
  • To utilize mathematical modeling for a parametric study of these influential factors.

Main Methods:

  • A parametric mathematical modeling approach was employed.
  • Simulations were conducted to analyze the effects of various parameters on drug distribution and concentration.
  • Key parameters included tissue properties (edema onset/duration), hydrogel characteristics (permeability, drug affinity), and drug properties (intracellular partitioning, binding affinity).

Main Results:

  • Post-surgical edema significantly influences drug distribution; delayed onset and longer duration can homogenize drug delivery.
  • Hydrogel permeability and drug affinity impact early drug concentration and distribution dynamics.
  • Drug properties like intracellular partitioning and binding affinity affect early efficacy and sustained delivery.
  • Tissue factors such as transvascular permeability and elimination rates, along with extracellular diffusivity, are critical for optimizing drug delivery outcomes.

Conclusions:

  • Mathematical modeling provides critical insights into optimizing hydrogel-based drug delivery systems for glioblastoma.
  • Understanding the interplay between tissue, hydrogel, and drug properties is essential for enhancing therapeutic efficacy and preventing GBM recurrence.
  • This study offers guidance for designing more effective localized drug delivery strategies to combat glioblastoma post-surgery.