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相关概念视频

Habitat Fragmentation02:31

Habitat Fragmentation

21.5K
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
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Mass Spectrometry: Alkene Fragmentation00:59

Mass Spectrometry: Alkene Fragmentation

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Alkenes lose one electron from the unsaturated π bond upon ionization and form stable molecular ions. Further fragmentation of alkenes occurs through three different reaction pathways. The most prominent fragmentation is the cleavage at the allylic position. The resultant allylic carbocation is resonance stabilized. In the mass spectra of terminal alkenes, this fragment appears at a mass-to-charge ratio of 41. In the internal alkenes, where there are two choices of allylic cleavage, the...
3.7K
Mass Spectrometry: Amine Fragmentation00:55

Mass Spectrometry: Amine Fragmentation

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Amines can be identified using mass spectroscopy based on their characteristic fragmentation patterns. The molecular ions of amines undergo fragmentation via ⍺-cleavage. The ⍺-cleavage of the carbon-carbon bonds in amines generates an alkyl radical and resonance-stabilized nitrogen-containing cation.
In amines, the number of nitrogen atoms affects the mass of the molecular ion, which is described by the nitrogen rule of mass spectrometry. This rule states that a compound containing a single...
2.4K
Mass Spectrometry: Cycloalkane Fragmentation01:05

Mass Spectrometry: Cycloalkane Fragmentation

2.3K
In mass spectrometry, cycloalkanes exhibit distinct fragmentation patterns due to the inherent stability of their molecular ions compared to linear or branched alkanes. The ring structure of cycloalkanes provides additional stability to the molecular ions, often resulting in prominent ion peaks in the mass spectrum.
For example, cyclohexane molecular ions have a mass-to-charge ratio (m/z) of 84, which tends to produce a stronger signal than linear alkanes like hexane. This stability comes from...
2.3K
Mass Spectrometry: Cycloalkene Fragmentation00:54

Mass Spectrometry: Cycloalkene Fragmentation

1.6K
The molecular ions of cycloalkenes undergo fragmentation via a retro-Diels–Alder reaction.
1.6K
Mass Spectrometry: Alkyne Fragmentation00:53

Mass Spectrometry: Alkyne Fragmentation

2.2K
The fragmentation of alkynes preferentially occurs at the carbon–carbon bond between the α and β carbon of the alkyne bond to generate a 3-propynyl cation (or propargyl cation). In terminal alkynes, there is the only type of fragmentation that yields the 3-propynyl cation. The unsubstituted 3-propynyl cation exhibits a peak at a mass-to-charge ratio of 39. In internal alkynes, the 3-propynyl cation is substituted. For example, 2-pentyne fragments into methyl-substituted 3-propynyl cation,...
2.2K

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相关实验视频

Updated: Feb 10, 2026

NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode
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NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode

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基于模板的自动碎片化算法,用于基于能源的一般化碎片化框架中的复杂和大型系统.

Xuerong Wang1, Junhui Sun1, Linke He1

  • 1State Key Laboratory of Coordination Chemistry, Key Laboratory of Mesoscopic Chemistry of Ministry of Education, Jiangsu Key Laboratory of Clean Energy Catalysis and Intelligent Green Chemical Engineering, New Cornerstone Science Laboratory, School of Chemistry, Nanjing University, Nanjing 210023, People's Republic of China.

The Journal of chemical physics
|February 9, 2026
PubMed
概括
此摘要是机器生成的。

我们为大分子开发了一种自动化碎片化算法,大大降低了量子化学计算中的计算成本和手工精力. 这种方法实现了高精度,使得复杂的分子模拟更快,更容易获得.

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科学领域:

  • 计算化学的计算化学
  • 量子化学 是一个量子化学.
  • 分子建模分子建模

背景情况:

  • 基于能源的碎片化方法通常需要人工干预,导致效率低下和不一致.
  • 将量子化学计算扩展到大型和复杂的分子系统仍然是一个重大挑战.

研究的目的:

  • 开发基于模板的自动碎片化算法,以克服现有方法的局限性.
  • 扩展基于能源的一般化碎片化 (GEBF) 方法,以有效地分割各种分子系统.

主要方法:

  • 实现了一个层次化的SMILES编码的GEBF模板库,用于循环和非循环函数组.
  • 使用结构转换,宏循环检测,亚结构匹配和小碎片合并进行分区.
  • 控制碎片大小以平衡精度和计算成本,并提供用户定义模板的选项.

主要成果:

  • 对各种复杂分子 (生物宏分子,宏循环等) 实现了与传统方法相比的量子化学结果. ) 的情况.
  • 将最大的子系统基础大小减少了三分之二以上,使大系统 (例如1500个原子的寡合体) 的实际计算成为可能.
  • 验证了GEBF力,用于准确的几何优化,光谱预测和反应能量计算.

结论:

  • 开发的算法可实现大规模应用的全自动化,可扩展和准确的量子化学.
  • 这一进步通过降低计算成本,弥合了理论化学和现实世界应用之间的差距.
  • 该方法为复杂系统提供了高准确度的预测,包括酶中的反应机制.