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Cancer is the second leading cause of death in the United States. A cancer cell is genetically unstable and hence can mutate faster. They can also modify their microenvironment and escape immune surveillance. The difficulties in treating cancer are further compounded by the emergence of rapid resistance to anticancer drugs. The most common ways to attain resistance in cancer cells include alteration in drug transport and metabolism, modification of drug target, elevated DNA damage response, or...
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In an underdamped second-order system, where the damping ratio ζ is between 0 and 1, a unit-step input results in a transfer function that, when transformed using the inverse Laplace method, reveals the output response. The output exhibits a damped sinusoidal oscillation, and the difference between the input and output is termed the error signal. This error signal also demonstrates damped oscillatory behavior. Eventually, as the system reaches a steady state, the error diminishes to zero.
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First-order systems, such as RC circuits, are foundational in understanding dynamic systems due to their straightforward input-output relationship. Analyzing their responses to different input functions under zero initial conditions reveals significant insights into system behavior.
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A servo system exemplifies a second-order system, featuring a proportional controller and load elements that ensure the output position aligns with the input position. The relationship between these components is described by a second-order differential equation. Applying the Laplace transform under zero initial conditions yields the transfer function, showing how inputs are converted to outputs in the system.
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A thermodynamic system is a set of objects whose thermodynamic properties are of interest. The system is considered to be embedded in its surroundings or the environment. The system and its environment can exchange heat and do work on each other through a boundary that separates them. However, the immediate surroundings of the system interact with it directly and therefore have a much stronger influence on its behavior and properties.
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Linearity is a system property characterized by a direct input-output relationship, combining homogeneity and additivity.
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Related Experiment Video

Updated: Jan 31, 2026

Intraductal Delivery and X-ray Visualization of Ethanol-Based Ablative Solution for Prevention and Local Treatment of Breast Cancer in Mouse Models
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Cyclodextrin-based delivery systems for cancer treatment.

Dongjing Zhang1, Pin Lv2, Cheng Zhou1

  • 1Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, PR China.

Materials Science & Engineering. C, Materials for Biological Applications
|January 5, 2019
PubMed
Summary

Cyclodextrin-based delivery systems offer advanced cancer treatment by targeting tumors and responding to the body. These materials show promise for next-generation precision medications and genetic therapies.

Keywords:
Cancer treatmentChemotherapy drugsCyclodextrin-based delivery systemGenetic therapeutic agentsIntelligentPrecise releaseTargeting

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Area of Science:

  • Materials Chemistry
  • Pharmaceutical Science
  • Drug Delivery Systems

Background:

  • Cyclodextrins are safe excipients forming host-guest complexes with pharmaceutical applications.
  • Targeted and responsive materials are key for next-generation precision medications.
  • Cyclodextrin-based polymers can condense nucleic acids for genetic therapeutic applications.

Purpose of the Study:

  • To review recent advances in cyclodextrin-based delivery systems for cancer treatment.
  • To highlight systems capable of targeting or responding to the physiological environment.
  • To discuss design principles, challenges, and future directions, including clinical translation.

Main Methods:

  • Review of recent scientific literature on cyclodextrin-based drug delivery systems.
  • Focus on targeting and responsive functionalities for cancer therapy.
  • Analysis of design strategies, challenges, and clinical translation potential.

Main Results:

  • Cyclodextrin-based systems demonstrate significant potential for targeted and responsive cancer drug delivery.
  • Advances include improved drug loading, controlled release, and enhanced therapeutic efficacy.
  • These systems are being explored for their role in genetic therapeutics and precision medicine.

Conclusions:

  • Cyclodextrin-based delivery systems represent a promising platform for advanced cancer treatment.
  • Further research and clinical translation are crucial for realizing their full therapeutic potential.
  • The unique properties of cyclodextrins enable innovative approaches in drug delivery and materials science.