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Related Concept Videos

Stress01:20

Stress

8.9K
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...
8.9K
General State of Stress01:21

General State of Stress

732
The general state of stress within a material can be accurately depicted using a stress tensor. This tensor encapsulates the internal forces distributed within a material subjected to external forces or deformations.
Specifically, consider a tetrahedral element where one face, labeled XYZ, is perpendicular to the line OA, and the remaining faces align with the coordinate axes with point O as the origin. At any point, such as point O, the stress tensor can be used to determine the stress...
732
Components of Stress01:23

Components of Stress

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Stress analysis under multiple loading conditions is intricate, necessitating a comprehensive grasp of normal and shearing stresses. Consider a small cube at point O, subjected to stress on all six faces, visible or not. Normal stress components σx, σy, σz act perpendicularly to the x, y, and z axes. Shearing stress components τxy and τxz are exerted on faces perpendicular to these axes.
Interestingly, the hidden cube faces also experience these stresses, equal and...
608
Physiological Foundation of Stress01:24

Physiological Foundation of Stress

887
Stress triggers a coordinated physiological response involving the sympathetic nervous system (SNS) and the hypothalamic-pituitary-adrenal (HPA) axis. This dual activation ensures that the body is prepared for both immediate and prolonged stress management. The process begins with the perception of a stressor. This initial phase activates the SNS, leading to the rapid release of adrenaline (epinephrine) from the adrenal glands.
Role of the Sympathetic Nervous System
Adrenaline triggers the...
887
Applications of Stress01:04

Applications of Stress

725
Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
725
Types of Stressors01:23

Types of Stressors

802
A stressor is any event, condition, or stimulus that triggers stress and causes a physical or psychological response in the body. Stressors can be categorized into three main types: catastrophes; significant life changes; and daily hassles, including social stress. Each can be detrimental to physical and mental well-being.
Catastrophes
Catastrophes refer to large-scale, unpredictable events that create overwhelming stress and a sense of threat. Examples include natural disasters like...
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Related Experiment Video

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A Modified Trier Social Stress Test for Vulnerable Mexican American Adolescents
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A Modified Trier Social Stress Test for Vulnerable Mexican American Adolescents

Published on: July 10, 2017

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Silence without stress.

David J Young1, Nicholas R Guydosh1

  • 1Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, United States.

Elife
|November 12, 2016
PubMed
Summary
This summary is machine-generated.

Two mechanisms control the translation of Hac1 protein mRNA, ensuring this key transcription factor for the unfolded protein response is only produced when necessary.

Keywords:
S. cerevisiaechromosomesgenestranslationubiquitinationunfolded protein response

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Area of Science:

  • Molecular Biology
  • Cellular Stress Response

Background:

  • The unfolded protein response (UPR) is a critical cellular pathway for maintaining endoplasmic reticulum homeostasis.
  • Hac1 protein is a central transcription factor that regulates the UPR.
  • Precise control over Hac1 protein levels is essential to prevent cellular damage.

Purpose of the Study:

  • To elucidate the regulatory mechanisms governing Hac1 mRNA translation.
  • To understand how cells ensure Hac1 protein is produced only under conditions of ER stress.

Main Methods:

  • Analysis of Hac1 mRNA structure and regulatory elements.
  • Investigating protein-RNA interactions involved in translation control.
  • Utilizing yeast models to study UPR activation and Hac1 translation.

Main Results:

  • Identification of specific mRNA features that regulate Hac1 translation.
  • Demonstration of distinct mechanisms that prevent or initiate Hac1 mRNA translation.
  • Correlation between these regulatory mechanisms and UPR activation.

Conclusions:

  • Hac1 mRNA translation is tightly regulated by at least two distinct mechanisms.
  • These mechanisms ensure timely and appropriate production of Hac1 protein during the unfolded protein response.
  • This regulatory system is crucial for effective cellular adaptation to endoplasmic reticulum stress.