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関連する概念動画

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

5.3K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
5.3K
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

1.5K
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...
1.5K
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

3.2K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
3.2K
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

2.8K
Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
2.8K
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

2.0K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
2.0K
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

2.0K
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
2.0K

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Author Spotlight: Unveiling the Potential of VSFG Microscopy in Studying Mesoscopically Heterogeneous Self-Assembled Structures
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スーパーマルチプレックス振動画像

Lu Wei1, Zhixing Chen1, Lixue Shi1

  • 1Department of Chemistry, Columbia University, New York, New York 10027, USA.

Nature
|April 21, 2017
PubMed
まとめ
この要約は機械生成です。

研究者は刺激されたラーマン散乱を用いた 新しい超多重光学画像法を開発した. このテクニックは,生物学的研究を進めるために,生細胞の24の異なる分子種の高感度,高選択性可視化を可能にします.

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科学分野:

  • バイオ物理学
  • 分子イメージング
  • 細胞生物学

背景:

  • 現在の分子イメージング技術は,スペクトルの重複と感度の問題により,細胞内の多数の異なる分子種を同時に視覚化することに制限があります.
  • 光顕微鏡は,識別可能な信号の数を制限する"色障壁"によって制限され,自発的なラーマン顕微鏡は信号の強度が弱い.
  • 既存の方法は,生きた生物システム内の複数の分子標的を定量的に画像化するために,高い選択性と感度を達成するために苦労しています.

研究 の 目的:

  • 生体細胞内の多数の異なる分子種を,高い選択性と感度で視覚化できる新しい光学画像アプローチを開発する.
  • 既存の顕微鏡技術,特に光と自発的なラーマン顕微鏡における低信号の"色障壁"を克服する.
  • 細胞と組織の異質性を詳細に分析するための超複合画像処理能力を確立する.

主な方法:

  • 信号検出の強化のため,電子前共振条件下で刺激されたラーマン分散顕微鏡 (SRS) を利用した.
  • トリプルボンド結合の近赤外線染料のパレットを開発し,それぞれがセルサイレントのラマンスペクトルウィンドウで単一のピークを示しています.
  • 新しい染料パレットを既存の光探知器と組み合わせて,スーパーマルチプレックスイメージングのために24の解像度のある色を得ました.

主要な成果:

  • 生体細胞における標的分子の高度に選択的で敏感なイメージングを達成し,感度が250ナノモラーと1ミリ秒の時間常数まで低下した.
  • 新しいラーマン染料と光探査機を組み合わせることで24色の超多重画像処理能力を実証した.
  • ニューロン共同培養と脳組織におけるDNAとタンパク質代謝の細胞型依存異質性を成功裏に可視化しました.

結論:

  • 開発された刺激されたラーマン散布ベースの超複合光学画像アプローチは,生きた生物系における複数の分子種を視覚化するための前例のない能力を提供します.
  • この技術は,以前のスペクトルおよび感度制限を克服し,複雑な細胞プロセスと組織異質性に対するより深い洞察を可能にします.
  • 24色の画像プラットフォームは,生理学と病理学における複雑な相互作用の理解を進めるための大きな可能性を秘めています.