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相关概念视频

Base Quantities and Derived Quantities01:14

Base Quantities and Derived Quantities

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In any system of units, the units for some physical quantities must be specified through a measurement process. These measurements are the base quantities of the system, and their units are the base units of the system. The algebraic combinations of the base values can then be used to express all other physical quantities. Each of these physical quantities is then referred to as a derived quantity, with each unit being referred to as a derived unit.
The International Organization for...
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Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving01:29

Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving

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Mechanistic models play a crucial role in algorithms for numerical problem-solving, particularly in nonlinear mixed effects modeling (NMEM). These models aim to minimize specific objective functions by evaluating various parameter estimates, leading to the development of systematic algorithms. In some cases, linearization techniques approximate the model using linear equations.
In individual population analyses, different algorithms are employed, such as Cauchy's method, which uses a...
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Gas Chromatography–Mass Spectrometry (GC–MS)01:14

Gas Chromatography–Mass Spectrometry (GC–MS)

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Gas chromatography–mass spectrometry (GC–MS) is the combination of analytical techniques of gas chromatography and mass spectrometry in a single instrument for analyzing a mixture of compounds. The gas chromatograph separates the compounds in the mixture, and the mass spectrometer analyzes each compound separately to determine the molecular masses and molecular structures.
A gas chromatograph consists of a long, narrow capillary column with a polysiloxane coating on the inner wall....
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GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

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Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
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相关实验视频

Updated: Sep 19, 2025

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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基于蛋白质的QM-CGMM

Yi Sun1

  • 1Department of Chemistry, Chicago Center for Theoretical Chemistry, James Franck Institute, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, IL 60637, United States.

Journal of molecular graphics & modelling
|June 6, 2025
PubMed
概括
此摘要是机器生成的。

这项研究介绍了一种粗粒度分子力学 (CGMM) 方法,用于蛋白质骨干. 这种新的方法准确地捕捉了热力学特性,如自由能量障碍,以较低的计算成本.

关键词:
有粗粒度的粗粒度.增强采样 提升采样平均力力量的潜力.热力学一致性 热力学一致性

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Last Updated: Sep 19, 2025

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Sample Preparation in Quartz Crystal Microbalance Measurements of Protein Adsorption and Polymer Mechanics

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科学领域:

  • 计算化学的计算化学
  • 生物物理学的生物物理.
  • 分子动力学分子动力学

背景情况:

  • 精确的分子模拟需要平衡计算成本和精度.
  • 粗粒度 (CG) 方法减少了复杂性,但往往牺牲了热力学真实性.
  • 蛋白质脊柱对CG建模具有独特的挑战,因为它们的静电贡献.

研究的目的:

  • 在混合QM/MM模拟中开发一种热力学上一致的蛋白质骨干粗粒度方法.
  • 在CG模型中准确地表示氨基酸残留的静电场.
  • 为了能够有效地计算酶反应中的自由能量障碍.

主要方法:

  • 开发了一个每氨基酸残留物4颗珠的模型来复制静电场.
  • 将CG模型与异质弹性网络模型 (heteroENM) 力场集成.
  • 在QM/CGMM边界应用Lennard-Jones参数.
  • 用过渡温度元动力学 (TTMetaD) 进行自由能量计算.

主要成果:

  • 成功地将CGMM方法应用于Chorismate Mutase系统.
  • 获得了酶反应的汇聚的潜在平均力 (PMF).
  • 计算的自由能量屏障与实验值非常接近.
  • 证明CGMM可以有效地重现全原子热力学特性.

结论:

  • 拟议的CGMM方法为模拟蛋白质系统提供了一种计算效率高且准确的方法.
  • 这种方法具有研究复杂的酶机制和其他生物分子过程的巨大潜力.
  • CGMM模型的热力学一致性是通过其预测实验自由能量障碍的能力来验证的.