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Related Concept Videos

Stress Concentrations01:13

Stress Concentrations

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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 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 Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

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Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
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Decreasing Function01:27

Decreasing Function

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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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Concentration Cells02:41

Concentration Cells

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A concentration cell is a type of a  voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
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Oxidation Numbers03:14

Oxidation Numbers

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Related Experiment Video

Updated: Jan 24, 2026

Remote Limb Ischemic Preconditioning: A Neuroprotective Technique in Rodents
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Remote Limb Ischemic Preconditioning: A Neuroprotective Technique in Rodents

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Neuroprotection mediated by remote preconditioning is associated with a decrease in systemic oxidative stress and

Jana Jachova1, Miroslav Gottlieb1, Miroslava Nemethova1

  • 1Institute of Neurobiology of Biomedical Research Center of Slovak Academy of Sciences, Kosice, Slovak Republic.

Neurochemistry International
|May 17, 2019
PubMed
Summary

Remote organ ischemia can protect the brain, but mechanisms are unclear. Hind-limb tourniquet preconditioning reduced brain neurodegeneration by 30% and systemic oxidative stress by 80% in rats, suggesting glutamate

Keywords:
BloodBrain ischemiaGlutamateNeuroprotectionRemote ischemic preconditioningSystemic oxidative stress

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Area of Science:

  • Neuroscience
  • Ischemia Research
  • Neuroprotection Mechanisms

Background:

  • Remote organ ischemia can induce tolerance in sensitive brain tissues.
  • The precise mechanisms underlying this remote ischemic tolerance remain largely unknown.
  • Understanding these mechanisms is crucial for developing new neuroprotective strategies.

Purpose of the Study:

  • To investigate the role of glutamate in neuroprotection induced by remote ischemic tolerance.
  • To identify blood parameters affected in animals experiencing hind-limb ischemia.
  • To explore the impact of hind-limb tourniquet preconditioning on brain and blood markers.

Main Methods:

  • Induction of early remote ischemic tolerance in rats using hind-limb ischemia via tourniquet.
  • Measurement of glutamate concentrations in various brain regions (cortex, hippocampus CA1, dentate gyrus).
  • Analysis of blood glutamate levels and lymphocytic DNA damage during postischemic reperfusion.
  • Assessment of blood antioxidant enzyme activity (catalase, superoxide dismutase).

Main Results:

  • Hind-limb tourniquet preconditioning decreased neurodegeneration by approximately 30% but did not improve neurological deficit recovery.
  • Glutamate concentration decreased in all studied brain regions following ischemia.
  • Blood glutamate levels significantly increased during postischemic reperfusion (26-29%).
  • Preconditioning reduced systemic oxidative stress (lymphocytic DNA damage) by about 80%.
  • No significant changes were detected in blood catalase or superoxide dismutase activity.

Conclusions:

  • Hind-limb tourniquet preconditioning may enhance brain glutamate efflux, contributing to neuronal survival in ischemic brain regions.
  • Remote preconditioning effectively mitigates systemic oxidative stress.
  • Enzymatic antioxidant defenses in the blood do not appear to be the primary mediators of this effect.