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Related Concept Videos

Coagulation01:09

Coagulation

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The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
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Mass Spectrometry: Molecular Fragmentation Overview01:20

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The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
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Entropy Change in Reversible Processes01:10

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In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
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Introduction to Hemostasis01:05

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Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
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Clot Retraction and Fibrinolysis01:16

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After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

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Evolution of Coagulation-Fragmentation Stochastic Processes Using Accurate Chemical Master Equation Approach.

Farid Manuchehrfar1, Wei Tian1, Tom Chou2

  • 1Department of Bioengineering, University of Illinois at Chicago (UIC), Chicago, Illinois, USA.

Communications in Information and Systems
|August 23, 2021
PubMed
Summary
This summary is machine-generated.

Coagulation and fragmentation (CF) is a fundamental process studied using the discrete Chemical Master Equation. Three-dimensional systems and higher attachment rates promote larger cluster formation.

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Area of Science:

  • Physical Chemistry
  • Statistical Mechanics
  • Complex Systems

Background:

  • Coagulation and fragmentation (CF) describes particle aggregation and disaggregation.
  • It is a ubiquitous stochastic process vital in physical and biological systems.
  • CF often occurs in confined spaces with limited particle availability.

Purpose of the Study:

  • To investigate the time-dependent behavior of coagulation and fragmentation (CF).
  • To analyze the influence of dimensionality, attachment/detachment rates, and initial conditions on CF dynamics.
  • To utilize the Accurate Chemical Master Equation (ACME) for dCME analysis.

Main Methods:

  • Formulation of the CF process using the discrete Chemical Master Equation (dCME).
  • Application of the Accurate Chemical Master Equation (ACME) method for time-dependent analysis.
  • Comparative study of CF in one and three dimensions.

Main Results:

  • Three-dimensional systems exhibit a higher propensity for forming large clusters compared to one-dimensional systems.
  • The ratio of attachment to detachment rates significantly impacts system dynamics and steady-state.
  • A clear relationship exists between initial conditions and the formation of large clusters.

Conclusions:

  • Dimensionality is a critical factor influencing cluster size distribution in CF processes.
  • Attachment and detachment rates dynamically control the evolution and equilibrium of the CF system.
  • Initial conditions play a key role in determining the ultimate outcome of cluster formation.