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Related Concept Videos

Stress Concentrations01:24

Stress Concentrations

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Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
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Stress Concentrations01:13

Stress Concentrations

698
The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress...
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Stress: General Loading Conditions01:15

Stress: General Loading Conditions

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To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
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Stress01:20

Stress

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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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Physiological Foundation of Stress01:24

Physiological Foundation of Stress

770
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...
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Introduction to Stress and Lifestyle01:27

Introduction to Stress and Lifestyle

686
Stress is a multifaceted response to events perceived as challenging or threatening, highlighting physical, emotional, cognitive, and behavioral reactions. Physically, stress can lead to fatigue, sleep disruptions, and various health issues such as frequent colds, chest pains, and nausea. Emotionally, it can manifest as anxiety, depression, irritability, and anger triggered by both minor and major life events. Cognitively, it may result in difficulty in concentration, memory, and...
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BS3 Chemical Crosslinking Assay: Evaluating the Effect of Chronic Stress on Cell Surface GABAA Receptor Presentation in the Rodent Brain
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Formaldehyde stress.

Rongqiao He1, Jing Lu, Junye Miao

  • 1State Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China. rongqiaohe@gmail.com

Science China. Life Sciences
|December 25, 2010
PubMed
Summary
This summary is machine-generated.

Elevated formaldehyde levels in the elderly are linked to cognitive decline and Alzheimer's disease. This endogenous compound can cause cellular stress, impacting brain function and potentially contributing to dementia.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Gerontology

Background:

  • Formaldehyde is a toxic organic compound produced endogenously in human cells.
  • Endogenous formaldehyde levels increase with age, particularly over 65.
  • Elevated formaldehyde is implicated in cognitive dysfunction and neurodegenerative diseases.

Purpose of the Study:

  • To investigate the correlation between endogenous formaldehyde levels and cognitive function in the elderly.
  • To explore the cellular mechanisms by which formaldehyde impacts brain health.
  • To determine if formaldehyde stress contributes to age-related cognitive decline and dementia.

Main Methods:

  • Clinical trials comparing urine formaldehyde concentrations in elderly Alzheimer's patients and healthy elderly volunteers.
  • Analysis of cellular responses to varying formaldehyde concentrations, including protein modifications and cell death.
  • Assessment of cognitive function markers related to learning and memory.

Main Results:

  • Significantly higher urine formaldehyde concentrations were observed in elderly Alzheimer's patients compared to normal elderly controls (P<0.001).
  • Abnormally high formaldehyde levels were associated with cognitive dysfunction, including learning decline and memory loss.
  • Excess formaldehyde induces cellular stress responses, such as protein hydroxymethylation, hyperphosphorylation, and misfolding, potentially leading to cell death.

Conclusions:

  • Increased endogenous formaldehyde levels represent a significant risk factor for cognitive decline and Alzheimer's disease in the elderly.
  • Formaldehyde stress disrupts cellular homeostasis and protein function in the brain, contributing to neurodegeneration.
  • Formaldehyde stress may be a key mechanism underlying age-related dementia and senile dementia.