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Related Concept Videos

Problem Solving on Stress and Strain01:22

Problem Solving on Stress and Strain

Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
Elastic Strain Energy for Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
If...
Elastin is Responsible for Tissue Elasticity01:12

Elastin is Responsible for Tissue Elasticity

Elastic fiber contains the protein elastin along with lesser amounts of other proteins and glycoproteins. The main property of elastin is that it will return to its original shape after being stretched or compressed. Elastic fibers are prominent in elastic tissues found in skin and the elastic ligaments of the vertebral column.
Ligaments and tendons are made of dense regular connective tissue, but in ligaments not all fibers are parallel. Dense regular elastic tissue contains elastin fibers and...
Generalized Hooke's Law01:22

Generalized Hooke's Law

The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...

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Related Experiment Video

Updated: Jun 25, 2026

The Mechanics of (Poro-)Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
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Published on: March 10, 2023

Viscoelasticity in homogeneous protein solutions.

Weichun Pan1, Luis Filobelo, Ngoc D Q Pham

  • 1Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, USA.

Physical Review Letters
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

Protein solutions exhibit viscoelasticity due to protein networks, impacting intracellular transport. Understanding these transport properties is crucial for modeling cellular processes.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Physical Chemistry

Background:

  • Cytosolic transport is vital for cellular function.
  • Protein solutions can exhibit complex rheological behaviors.
  • Understanding protein solution dynamics is key to cell biology.

Purpose of the Study:

  • To investigate transport properties of protein solutions.
  • To understand dynamics relevant to the cell cytosol.
  • To characterize viscoelasticity in stable protein solutions.

Main Methods:

  • Measuring mean-squared displacement of probe particles.
  • Analyzing transport over a time range of 10^-3 to 10 seconds.
  • Studying model protein solutions stable against phase separation.

Main Results:

  • Protein solutions showed significant elasticity at high frequencies.
  • Solutions behaved purely viscous at low frequencies.
  • Viscoelasticity attributed to a protein network with 10-100 ms lifetime.

Conclusions:

  • Protein solutions possess intrinsic viscoelasticity.
  • This viscoelasticity arises from a network of weakly-bound protein chains.
  • Findings are relevant for biochemical kinetics models in cellular environments.