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Related Concept Videos

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Molecular Models

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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
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Fluid Mosaic Model01:19

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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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Characterizing Single-Molecule Conformational Changes Under Shear Flow with Fluorescence Microscopy
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MoFlow: visualizing conformational changes in molecules as molecular flow improves understanding.

Shareef M Dabdoub1, R Wolfgang Rumpf2, Amber D Shindhelm2

  • 1The Ohio State University Department of Periodontology, Columbus, OH, USA.

BMC Proceedings
|September 12, 2015
PubMed
Summary
This summary is machine-generated.

MoFlow visualizes molecular motion using pathlines, improving understanding over traditional timeline methods. This new approach offers better insights into molecular dynamics and structure.

Keywords:
Molecular ConformationMolecular DynamicsMolecular Structural BiologyVisualization

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Area of Science:

  • Computational chemistry
  • Molecular visualization
  • Biophysics

Background:

  • Traditional molecular motion visualizations use timeline-analogous representations.
  • This differs from the human pathline-like understanding of motion.
  • A new system, MoFlow, is introduced for pathline-analogous molecular motion visualization.

Purpose of the Study:

  • To present MoFlow, a novel system for visualizing molecular motion.
  • To utilize a pathline-analogous representation for enhanced clarity.
  • To improve upon existing timeline-based visualization methods.

Main Methods:

  • Development of the MoFlow system for molecular motion visualization.
  • Implementation of pathline-analogous representations.
  • Generation of high-quality renderings, interactive WebGL visualizations, and 3D printable models.

Main Results:

  • MoFlow produces high-quality atom pathline renderings.
  • Interactive WebGL visualizations and 3D printable models are generated.
  • A user study indicated MoFlow representations are superior to canonical ones for conveying molecular motion.

Conclusions:

  • Pathline-based molecular motion representations are more easily understood than timeline representations.
  • Pathline representations directly depict motion, unlike structure-based inferred motion.
  • MoFlow offers a more intuitive and effective method for visualizing molecular dynamics.