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相关概念视频

Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

620
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
620
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.1K

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相关实验视频

Updated: Jun 12, 2025

Author Spotlight: Streamlining Visual Dynamics to Simplify Molecular Dynamics Simulations Using Gromacs
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45岁的CHARMM:提高了可访问性,功能性和速度.

Wonmuk Hwang1,2,3,4, Steven L Austin5, Arnaud Blondel6

  • 1Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843, United States.

The journal of physical chemistry. B
|September 20, 2024
PubMed
概括
此摘要是机器生成的。

这篇评论详细介绍了CHARMM (哈佛宏分子力学化学) 的最新进展,这是生物化学和生物物理学的关键计算工具. 它涵盖了新的模拟引擎,用户界面和生物分子系统的方法.

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Author Spotlight: In Silico Creation and Impact of Carbonylated Amino Acids on Protein Structure and Function
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Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
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Author Spotlight: In Silico Creation and Impact of Carbonylated Amino Acids on Protein Structure and Function
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Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
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科学领域:

  • 计算生化学计算生化学
  • 生物物理学的生物物理.
  • 分子建模分子建模

背景情况:

  • 近50年来,CHARMM (哈佛大分子力学化学) 已成为计算生物化学和生物物理学的基本工具.
  • 实验研究和计算能力的不断进步需要对计算方法的更新.

研究的目的:

  • 审查自2009年最后一次全面审查以来CHARMM的重大发展情况.
  • 提供CHARMM在生物分子研究中的能力和应用的最新概述.

主要方法:

  • 总结新的模拟引擎和计算方法.
  • 突出提高用户界面的改进,以提高可访问性.
  • 在量子力学,原子学和粗粒度层面上详细介绍模拟和分析方法的进步.
  • 审查扩展的力量场覆盖范围.

主要成果:

  • 引入更快的模拟引擎.
  • 开发可访问的用户界面,以简化工作流程.
  • 对各种生物分子系统的模拟和分析方法的扩展.
  • 强力场的全面更新.

结论:

  • 魅力继续发展,为生物分子系统的当代和新兴挑战提供了一个强大的平台.
  • 审查的进展提高了CHARMM对研究人员的实用性和可访问性.
  • CHARMM仍然是学术和非营利性研究的重要,免费可用的资源.