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相关概念视频

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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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...
1.1K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.2K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

2.3K
Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
2.3K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.2K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.2K
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
878
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

4.6K
Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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相关实验视频

Updated: Sep 13, 2025

In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging
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使用线性编码模型进行频率依赖的扩散测量的增强光谱响应.

Eric Seth Michael1, Franciszek Hennel1, Klaas Paul Pruessmann1

  • 1Institute for Biomedical Engineering, ETH Zurich and University of Zurich, Zurich, Switzerland.

Magnetic resonance in medicine
|July 28, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种用于光谱扩散测量的新定量方法,改进了脑成像中的频率依赖扩散 (D ((ω)) 的估计. 这种方法通过在频率间隔中表示光谱响应来恢复D ((ω) 的准确性更高.

关键词:
扩散磁力共振成像 (MRI) 扩散频率依赖的扩散方式振荡梯度的梯度是振荡的梯度.频谱反应的频谱反应

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Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells
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From Fast Fluorescence Imaging to Molecular Diffusion Law on Live Cell Membranes in a Commercial Microscope
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相关实验视频

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科学领域:

  • 磁共振成像技术 磁共振成像技术
  • 扩散式核磁共振成像 (MRI)
  • 定量成像技术 定量成像技术

背景情况:

  • 扩散MRI测量生物组织中的水扩散.
  • 频率依赖扩散 (D(ω)) 提供了对组织微观结构的洞察.
  • 目前的方法通常使用简化的单频表示来进行光谱编码.

研究的目的:

  • 为扩散MRI中的光谱编码开发一个更全面的定量表示.
  • 为了提高频率依赖扩散 (D ((ω)) 的估计精度.

主要方法:

  • 在连续的频率间隔中使用编码功率表示光谱响应 (playbackQ(ω)playback2).
  • 制定一个线性编码模型来估计间隔特定的扩散率.
  • 在体内使用人类大脑成像和模拟验证该策略.
  • 使用一个框架来选择强大的光谱编码.

主要成果:

  • 在体内,D ((ω)) 随频率的增加而增加,并且与单频方法相比,显示出更高的光谱选择性.
  • 模拟结果显示,D{\displaystyle D} 的估计准确度有所提高,特别是对于非线性D{\displaystyle D} 的估计准确度.
  • 对于更窄的频率间隔,观察到精度降低.

结论:

  • 对于光谱扩散测量的整体表示范式可以提高D ((ω) 恢复保真度.
  • 拟议的方法提供了一个更准确的方法来表征频率依赖的扩散.
  • 这一进步对在扩散MRI中理解组织微观结构有意义.