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¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

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Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Updated: Jan 8, 2026

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局部样本凝聚力规范化:在代谢学数据中保持固有的生物学异质性

Fanjing Guo1, Lingli Deng2, Kian-Kai Cheng3

  • 1Department of Electronic Science, National Institute for Data Science in Health and Medicine, Xiamen University, Xiamen 361005, China.

Analytical chemistry
|December 23, 2025
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概括
此摘要是机器生成的。

局部样本凝聚力规范化 (LSCN) 通过保持生物异质性来解决代谢学中的稀释效应. 与传统技术相比,这种新的方法提高了数据分析的可靠性.

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科学领域:

  • 代谢学 代谢学 代谢学
  • 生物信息学是一种生物信息学.
  • 数据科学数据科学数据科学

背景情况:

  • 代谢学数据经常遭受稀释效应,混下游分析.
  • 目前的规范化方法 (CSN,L2N,PQN,QT) 使用全球引用,未能保持生物异质性.
  • 这种人造的统一性扭曲了生物数据结构,影响了分析结果.

研究的目的:

  • 开发一种新的规范化方法,即局部样本凝聚力规范化 (LSCN),该方法可以纠正稀释效应,同时保持生物异质性.
  • 为代谢学数据提供一个强大的,生物忠实的预处理框架.

主要方法:

  • 在缩小尺寸的对相似性基础上,LSCN构建样本特定的邻居集.
  • 规范化是在这些已识别的社区内本地进行的,以减轻技术偏差.
  • 使用模拟和现实世界代谢学数据集与传统方法 (CSN,L2N,PQN,QT) 进行验证.

主要成果:

  • 与传统方法相比,LSCN在保护异质性和生物信号方面表现优越.
  • 提高了差异代谢物,相关性网络,途径丰富和分类准确性的识别.
  • 有效地纠正稀释效应,产生更准确的正常化因子和减少组内变异.

结论:

  • LSCN提供了一种强大的,生物忠实的方法来进行代谢学数据预处理.
  • 这种方法提高了下游分析的可靠性,通过准确地纠正稀释效应而不会失去生物变异.
  • 在各种样本类型中,LSCN是推动代谢学研究的宝贵工具.