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Related Concept Videos

Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
True Stress and True Strain01:28

True Stress and True Strain

Engineering stress is calculated as the load divided by the original, undeformed cross-sectional area. It approximates a material under load. This approximation is especially relevant post-yield in ductile materials. Though engineering stress-strain diagrams are often used for their convenience and accessibility, they can sometimes fall short in accuracy, particularly when dealing with large strain values.
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
Stress on an Oblique Plane01:16

Stress on an Oblique Plane

Understanding stress on an oblique plane under axial loading is pivotal in material mechanics. This analysis offers insight into a material's durability and strength, which is crucial for civil engineering and structural design. Axial loading refers to force application along the material's central axis, causing compression or elongation and leading to normal stress. Normal stress occurs when a force acts perpendicularly to the material's area, resulting in compressive or tensile stress. When...
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
Strain Energy01:13

Strain Energy

Strain energy is a fundamental concept in the field of materials science and structural engineering, describing the energy absorbed by a material or structure when it is deformed under load.
Consider a rod that is fixed at one end and subjected to an axial force at the free end. This axial force induces stress within the rod, leading to its elongation. As the axial force increases, so does the elongation of the rod, illustrating a direct relationship between the force applied and the resulting...
Stress01:20

Stress

When a force is applied on a body, it undergoes deformation. In order to restore the body to its original shape and/or size, an opposite or restoring force is generated within the body. This restoring force is equal to the magnitude of the applied force, but acts in the opposite direction. The amount of this restoring force developed per unit area of the body is called stress. Stress is a tensor quantity and has the SI unit pascal. Stress can be separated into four broad categories depending...

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Related Experiment Video

Updated: May 22, 2026

Live Cell Imaging during Mechanical Stretch
07:42

Live Cell Imaging during Mechanical Stretch

Published on: August 19, 2015

Elongating under Stress.

Eulàlia de Nadal1, Francesc Posas

  • 1Cell Signaling Unit, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra (UPF), C/ Doctor Aiguader 88, 08003 Barcelona, Spain.

Genetics Research International
|May 9, 2012
PubMed
Summary
This summary is machine-generated.

Mitogen-activated protein kinases (MAPKs) regulate gene expression for cell survival. This study summarizes progress in understanding how MAPKs control transcriptional elongation during stress responses.

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Last Updated: May 22, 2026

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Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Gene Regulation

Background:

  • Mitogen-activated protein kinases (MAPKs) are crucial for cell survival by modulating gene expression in response to extracellular stimuli.
  • In yeast, the p38-related MAPK Hog1 is activated by high osmolarity (osmostress) and reprograms gene expression for survival.
  • MAPKs, including yeast Mpk1 and mammalian MAPKs, are increasingly recognized for their roles beyond transcription initiation, impacting transcriptional elongation.

Purpose of the Study:

  • To summarize recent advancements in understanding MAPK-regulated events during the transcriptional elongation phase.
  • To discuss future research directions in the field of signaling kinase regulation of transcription.

Main Methods:

  • Literature review and synthesis of recent findings on MAPK pathways.
  • Analysis of studies investigating MAPK involvement in transcriptional elongation in yeast and mammalian systems.

Main Results:

  • MAPKs play significant roles in regulating multiple steps of the transcription process, not just initiation.
  • Evidence suggests MAPKs are associated with coding regions of stress-responsive genes, influencing elongation.
  • Specific MAPKs like Hog1 and Mpk1 have demonstrated roles in modulating transcriptional elongation under stress conditions.

Conclusions:

  • MAPK signaling pathways are critical regulators of transcriptional elongation, particularly during cellular stress responses.
  • Further research into MAPK-mediated transcriptional elongation will enhance our understanding of gene expression control by signaling kinases.
  • The findings highlight a broader role for MAPKs in gene expression regulation, extending to the elongation step.