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相关概念视频

Mass Spectrometers01:16

Mass Spectrometers

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This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Mass Analyzers: Overview01:13

Mass Analyzers: Overview

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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
297
Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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通过无监督机器学习提高光谱仪性能.

Benjamin D Harding1,2, Ziling Hu2, Ashley Hiett1,2

  • 1Biophysics Graduate Program, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.

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概括
此摘要是机器生成的。

主要组件分析 (PCA) 监测影响固态NMR光谱 (SSNMR) 数据质量的环境漂移. 这种机器学习方法通过识别和纠正光谱工件来增强生物分子结构和动态分析.

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科学领域:

  • 生物物理学的生物物理.
  • 分析化学 分析化学
  • 频谱学是一种光谱学.

背景情况:

  • 固态NMR光谱 (SSNMR) 对于生物分子结构和动态的原子层次分析至关重要.
  • 多维SSNMR实验需要广泛的数据收集 (几天到几周) 并对环境波动敏感.
  • 环境变化会导致信号强度和频率偏移,引入人工物并影响光谱质量.

研究的目的:

  • 开发和演示一种无监督的机器学习方法,用于监测环境参数对SSNMR光谱的影响.
  • 评估主要组件分析 (PCA) 在SSNMR仪器仪表中识别和量化漂移的有效性.
  • 应用PCA来消除SSNMR光谱和识别场变异 (B0和B1).

主要方法:

  • 利用主要组件分析 (PCA),一个无监督的机器学习算法.
  • 应用PCA到多维双 (HC) 和三重共振 (HCN) SSNMR蛋白质光谱.
  • 证明PCA用于识别磁场B0漂移和B1场变化 (CP和脱).
  • 借助PCA,消除了膜蛋白EmrE.的SSNMR光谱.

主要成果:

  • PCA负载光谱确定了漂移环境参数的独特特征.
  • PCA得分有效量化了参数漂移的大小.
  • 该方法成功识别了B0和B1现场漂移.
  • 使用PCA来消除SSNMR光谱,提高数据质量.

结论:

  • PCA提供了一种客观的方法来监测NMR光谱仪的性能和环境影响.
  • 这种方法提高了SSNMR生物分子研究数据分析的可靠性和准确性.
  • 开发的方法可适应自动监测,适用于其他光谱技术.