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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Temperature Dependent Deformation01:12

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Deformations in a Symmetric Member in Bending01:18

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When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
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Evaluation of Keratinocyte Proliferation on Two- and Three-dimensional Type I Collagen Substrates
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Substrate deformations induce directed keratinocyte migration.

Hoda Zarkoob1, Sathivel Chinnathambi1, John C Selby2

  • 1Department of Biomedical Engineering, College of Engineering, University of Iowa, Iowa City, IA, USA.

Journal of the Royal Society, Interface
|June 15, 2018
PubMed
Summary
This summary is machine-generated.

Human skin cells (keratinocytes) sense and respond to mechanical forces from neighboring cells during wound healing. This cell migration is crucial for re-epithelialization, with the Rho/ROCK pathway and NM II being essential for directed movement.

Keywords:
actomyosinmechanobiologymechanosensingnon-muscle myosin IIpolyacrylamide gel

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Area of Science:

  • Cell Biology
  • Biophysics
  • Tissue Engineering

Background:

  • Cell migration is vital for wound healing, particularly keratinocyte re-epithelialization.
  • Mechanical cues and physical forces in the wound bed significantly influence cell behavior.
  • Previous studies indicated polyacrylamide gel stiffness affects keratinocyte behavior and epithelial sheet formation.

Purpose of the Study:

  • To investigate if keratinocytes respond to local substrate deformations mimicking neighboring cells.
  • To elucidate the role of mechanical signals in keratinocyte migration during wound healing.
  • To determine the involvement of specific cellular pathways in response to mechanical cues.

Main Methods:

  • Utilized a servo-controlled microneedle to apply prescribed local substrate deformations to single keratinocytes.
  • Observed keratinocyte responses to these controlled mechanical stimuli.
  • Investigated the effects of Y27632 and blebbistatin on cell migration in response to deformation.

Main Results:

  • Keratinocytes demonstrably sense and respond to mechanical signals from substrate deformations.
  • These responses are comparable to signals generated by neighboring cells or multicellular aggregates.
  • The Rho/ROCK pathway and non-muscle myosin II (NM II) are essential for substrate deformation-directed keratinocyte migration.

Conclusions:

  • Keratinocytes possess mechanosensory capabilities to detect and react to physical forces from their microenvironment.
  • Understanding these mechanical responses is critical for advancing wound healing therapies.
  • Targeting the Rho/ROCK pathway and NM II may offer novel strategies to enhance keratinocyte migration and wound closure.