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Related Concept Videos

Cellular Injury I: Introduction01:00

Cellular Injury I: Introduction

Cellular injury occurs when a cell cannot maintain homeostasis or adapt to stressors such as hypoxia, toxins, or trauma. Depending on severity and duration, injury may be reversible, allowing recovery, or irreversible, leading to cell death.General Mechanisms of Cell InjuryAlthough causes vary, most cellular injuries arise from a few key mechanisms that disrupt essential functions and often amplify one another. Cell survival depends on the extent and balance of these disturbances.ATP depletion...
Cellular Injury II: Classification01:21

Cellular Injury II: Classification

Cellular injury is any process that disrupts a cell’s ability to maintain homeostasis, leading to structural or functional changes. It is broadly classified based on etiology (cause) and mechanism of damage.Classification by EtiologyCellular injury may result from several causes. Hypoxic injury happens due to reduced oxygen delivery, most commonly from inadequate blood supply, such as arterial obstruction; for example, coronary artery thrombosis can cause myocardial infarction. Chemical injury...
Cellular Injury IV: Necrosis01:16

Cellular Injury IV: Necrosis

Necrosis is a form of irreversible cell death caused by severe injury such as ischemia, toxins, or trauma. Unlike programmed cell death, it is an uncontrolled, pathological process that typically provokes inflammation in surrounding tissues.Pathophysiologic ChangesNecrosis begins when cells sustain critical damage, leading to swelling of organelles, particularly mitochondria, and rapid ATP depletion. As energy levels decline, membrane ion pumps fail, leading to calcium influx and eventually,...
Cellular Injury IlI: Cellular Death01:11

Cellular Injury IlI: Cellular Death

Cell death is the irreversible loss of cellular structure and function, representing the final stage of severe injury. It plays a key role in both normal physiology and disease.Types of Cell DeathThe two main types are necrosis and apoptosis, though others like necroptosis and pyroptosis also exist.Necrosis:Necrosis is an unregulated form of cell death caused by severe injury such as trauma, toxins, or ischemia. It is characterized by cell swelling, membrane loss, rupture, and leakage of...
Cellular Injury V: Apoptosis and Autophagy01:22

Cellular Injury V: Apoptosis and Autophagy

Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...

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Visualizing the DNA Damage Response in Purkinje Cells Using Cerebellar Organotypic Cultures
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Cellular automaton model of damage.

C A Serino1, W Klein, J B Rundle

  • 1Department of Physics, Boston University, Boston, Massachusetts 02215, USA. cserino@physics.bu.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

Equilibrium methods fail to describe damage and failure when stress transfer is short-ranged. Long-range stress transfer failure resembles nucleation, while short-range failure is a continuous process.

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Area of Science:

  • Physics
  • Materials Science
  • Mechanical Engineering

Background:

  • Understanding material damage and catastrophic failure is crucial in engineering.
  • The influence of stress transfer range on failure mechanisms is not fully understood.

Purpose of the Study:

  • To investigate the applicability of equilibrium methods in describing damage processes.
  • To analyze how the stress transfer range affects catastrophic failure mechanisms.

Main Methods:

  • Theoretical analysis of damage accumulation.
  • Modeling of stress transfer phenomena in materials.
  • Comparison of short-range and long-range stress transfer scenarios.

Main Results:

  • Equilibrium methods are unsuitable for short-range stress transfer damage.
  • Instantaneous healing is required for equilibrium methods in long-range transfer.
  • Failure mechanisms differ significantly with stress transfer range: nucleation-like for long-range, continuous/critical-point-like for short-range.

Conclusions:

  • The stress transfer range fundamentally dictates the nature of material failure.
  • Equilibrium approaches have limited applicability in damage mechanics, especially for short-range interactions.