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相关概念视频

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
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Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Optimization of Radiochemical Reactions using Droplet Arrays
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快速放射化学探索的高通量实验方法的开发

E William Webb1, Kevin Cheng1, Wade P Winton1

  • 1Department of Radiology, University of Michigan Medical School, 1301 Catherine Street, Ann Arbor, Michigan 48109, United States.

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此摘要是机器生成的。

高通量实验 (HTE) 适用于放射化学,优化铜介导的放射化反应. 这种新的工作流允许对正电子发射断层扫描成像剂进行化学空间的快速分析和探索.

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科学领域:

  • 放射化学
  • 化学合成
  • 医学成像

背景情况:

  • 对研究生理过程至关重要的是正子发射断层扫描 (PET).
  • 目前的无线电标签优化依赖于低效的一次因素方法.
  • 由于放射性同位素寿命短,高通量实验 (HTE) 在放射化学中未得到充分利用.

研究的目的:

  • 为放射化学开发和展示一个有效的HTE工作流程.
  • 为了优化铜介导的化反应.
  • 探索药物相关的酸的化学空间.

主要方法:

  • 使用商业设备实施新的HTE工作流程.
  • 快速分析并行反应以进行优化.
  • 用于铜介导酸的酸.

主要成果:

  • 成功地将HTE适应放射化学的挑战.
  • 用于制药应用的放射性化反应的优化.
  • 为进一步研究生成大型放射化学数据集.

结论:

  • 开发的HTE工作流程克服了与短放射性同位素寿命相关的挑战.
  • 这种方法加速了PET成像剂的优化.
  • 在放射化学中促进化学空间的探索,用于药物发现.