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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
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Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
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Microtubule lattice plasticity.

Robert A Cross1

  • 1Centre for Mechanochemical Cell Biology, Warwick Medical School, Gibbet Hill, Coventry CV4 7AL, UK.

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|November 12, 2018
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Summary
This summary is machine-generated.

Microtubule dynamics are not solely determined by individual tubulin molecules. New research reveals lattice plasticity, where microtubule behavior emerges from complex interactions within the entire molecular network.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Classical microtubule dynamics models focus on individual tubulin nucleotide states.
  • Emerging evidence challenges this view, suggesting a more complex regulatory mechanism.

Purpose of the Study:

  • To explore the concept of microtubule lattice plasticity.
  • To understand how microtubule behavior emerges from collective molecular interactions.

Main Methods:

  • Review of recent experimental and theoretical studies on microtubule dynamics.
  • Analysis of factors influencing microtubule lattice structure and mechanics.

Main Results:

  • Microtubule lattice plasticity posits that dynamics are emergent properties.
  • These properties depend on neighboring tubulin states, isotypes, and various external factors.
  • Microtubules act as allosteric collectives integrating multiple inputs.

Conclusions:

  • Microtubule behavior is a complex, adaptive response of the entire lattice.
  • Lattice plasticity offers a more comprehensive framework for understanding microtubule function.