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Related Concept Videos

Spontaneity02:21

Spontaneity

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A spontaneous process is one that occurs naturally under certain conditions. A nonspontaneous process, on the other hand, will not take place unless it is “driven” by the continual input of energy from an external source. Processes have a natural tendency to occur in one direction under a given set of conditions. Water will naturally flow downhill (spontaneous process), but uphill flow (nonspontaneous process) requires outside intervention such as the use of a pump. Iron exposed to...
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Shear Diagram01:27

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In the study of beam mechanics, shear diagrams play a crucial role in understanding the distribution of shear forces along the length of a beam. Consider a beam AB that is supported at both ends and subjected to perpendicular loads.
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Shearing Stress01:19

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Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
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When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
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Spindle-shaped cells in confined tracks spontaneously generate shear flows, with flow characteristics dependent on stripe width. A critical width transition, explained by active gel theory, governs cell alignment and flow behavior.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Soft Matter Physics

Background:

  • Collective cell migration is crucial in embryonic development and tumor evolution.
  • Antiparallel cell displacements within confined tracks can lead to shear flows, but underlying mechanisms are unclear.

Purpose of the Study:

  • To investigate the mechanisms driving spontaneous shear flows in collective cell migration.
  • To understand how microenvironmental confinement, specifically stripe width, influences cell behavior and flow dynamics.

Main Methods:

  • Experimental observation of spindle-shaped cells migrating on stripes of varying widths.
  • Development and application of a hydrodynamic active gel theory.

Main Results:

  • Cells on wide stripes self-organize into a nematic phase with edge shear flows.
  • On narrower stripes (below a critical width), cells align with the stripe, and net flow vanishes.
  • The transition between flowing and non-flowing states is identified as a Fréedericksz transition.

Conclusions:

  • Cellular activity and confinement width dictate collective cell migration patterns and flow generation.
  • Active gel theory provides a framework for understanding spontaneous antiparallel cell displacements.
  • The findings offer a generic mechanism applicable to in vivo cell movement.