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Related Concept Videos

Long-term Potentiation01:35

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Long-term Potentiation01:25

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Improving short-term memory can be achieved through techniques like chunking and rehearsal. Chunking involves organizing information into larger, more manageable units. This technique is particularly useful for information that exceeds the typical memory span of between five and nine items. For instance, logging into an online account with a password like "ta89vq0179gz" involves grouping letters and numbers into three chunks—ta89, vq01, and 79gz. It makes large amounts of information more...
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Multi-responsive shape memory and self-healing hydrogels with gold and silver nanoparticles.

Hüsna Kılıç1, Deniz Ceylan2

  • 1Bezmialem Vakıf University, Health Sciences Institute, Department of Biotechnology, 34093 Istanbul, Turkey.

Journal of Materials Chemistry. B
|November 18, 2024
PubMed
Summary

New nanocomposite smart gels exhibit self-healing and shape memory capabilities, offering potential as advanced wound dressings. These smart gels demonstrate excellent biocompatibility and mechanical recovery for non-invasive wound closure applications.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Polymer Chemistry

Background:

  • Smart gels are advanced materials with tunable properties.
  • Self-healing and shape memory functionalities are desirable for biomedical applications.
  • Nanoparticles can enhance the performance of smart gel systems.

Purpose of the Study:

  • To design and synthesize nanocomposite smart gels (Nc-x) with self-healing and shape memory properties.
  • To investigate the effect of gold and silver nanoparticles on gel properties.
  • To evaluate the potential of these gels as wound dressing materials.

Main Methods:

  • Bulk polymerization of stearyl methacrylate (SM) and vinyl pyrrolidone (VP) in the presence of gold and silver nanoparticles.
  • Characterization of gel structure, self-healing, and shape memory behavior.
  • In vitro studies using human skin fibroblast cells to assess biocompatibility and wound healing potential.

Main Results:

  • Successfully synthesized Nc-x gels without chemical cross-linkers, relying on hydrophobic interactions and dipole-dipole bonds.
  • Demonstrated self-healing and shape memory properties, tunable via nanoparticles.
  • Achieved over 100% cell viability and significant scratch recovery in vitro, indicating excellent biocompatibility.

Conclusions:

  • Nc-x gels possess remarkable self-healing and shape memory properties.
  • The incorporated nanoparticles effectively tune the hydrophilic/hydrophobic balance.
  • These smart gels show significant promise as a non-invasive alternative for wound dressing applications.