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Related Concept Videos

Molecular Shapes01:18

Molecular Shapes

Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.Two regions of electron density in a diatomic...
VSEPR Theory02:37

VSEPR Theory

Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
Molecular Geometry and Dipole Moments02:36

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Newman Projections02:06

Newman Projections

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 conformers.
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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Related Experiment Video

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Published on: December 16, 2013

Internal coordinates for molecular dynamics and minimization in structure determination and refinement.

C D Schwieters1, G M Clore

  • 1Computational Bioscience and Engineering Laboratory, Center for Information Technology, National Institutes of Health, Building 12A, Bethesda, Maryland 20892-5624, USA. Charles.Schwieters@nih.gov

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|September 25, 2001
PubMed
Summary
This summary is machine-generated.

This software module enhances molecular dynamics simulations using internal coordinates. It offers superior torsion-angle dynamics and flexible integration with other packages.

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Area of Science:

  • Computational Chemistry
  • Structural Biology
  • Biophysics

Background:

  • Molecular dynamics (MD) simulations are crucial for understanding molecular behavior.
  • Simulations in internal coordinates can offer advantages in efficiency and conformational sampling.
  • Existing software packages may have limitations in specific simulation functionalities.

Purpose of the Study:

  • To develop a versatile software module for efficient molecular dynamics and local minimization calculations in internal coordinates.
  • To improve upon existing functionalities, particularly torsion-angle dynamics, within established simulation packages.
  • To create a portable and extensible module for broad applicability in computational chemistry.

Main Methods:

  • Implementation of a software module designed for internal coordinate calculations.
  • Integration of the module with the NIH X-PLOR structure refinement package.
  • Development of a portable design for easy interfacing with other molecular dynamics packages.
  • Incorporation of features such as general internal coordinate definition and adaptive step-size integration.

Main Results:

  • The module enables efficient molecular dynamics and local minimization in internal coordinates.
  • Demonstrated superior torsion-angle dynamics functionality compared to the native X-PLOR implementation.
  • The portable design facilitates straightforward integration with other simulation software.
  • The module supports general internal coordinate definitions and features an accurate, adaptive integration algorithm.

Conclusions:

  • The developed software module significantly enhances molecular dynamics simulations in internal coordinates.
  • It provides a more efficient and functional alternative for torsion-angle dynamics.
  • Its modular and portable design promotes wider adoption and further development in computational structural biology.