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関連する概念動画

UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...
Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
Difference from Background: Limit of Detection01:05

Difference from Background: Limit of Detection

The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.

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関連する実験動画

Updated: May 8, 2026

Non-invasive Optical Imaging of the Lymphatic Vasculature of a Mouse
09:52

Non-invasive Optical Imaging of the Lymphatic Vasculature of a Mouse

Published on: March 8, 2013

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画像とセンサーのための最適化された赤色吸収染料

Jonathan B Grimm1, Ariana N Tkachuk1, Ronak Patel1

  • 1Janelia Research Campus, Howard Hughes Medical Institute, 19700 Helix Drive, Ashburn, Virginia 20147, United States.

Journal of the American Chemical Society
|October 16, 2023
PubMed
まとめ
この要約は機械生成です。

研究者達は よりよい光イメージングのために ローダミン染料のバランスを調整して最適化しました 構造-活性関係は,単粒子の追跡やcAMPセンシングなどのアプリケーションで染料の性質をどのように制御するか明らかにしました.

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A Bright NIR-II Fluorescence Probe for Vascular and Tumor Imaging
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A Bright NIR-II Fluorescence Probe for Vascular and Tumor Imaging

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Non-invasive Optical Imaging of the Lymphatic Vasculature of a Mouse
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科学分野:

  • 有機化学
  • 生物物理化学
  • 光顕微鏡

背景:

  • ロダミンの染料は多用途の光探知器である.
  • その機能は,無色ラクトンと光ズウィテリオンとの間の均衡に依存しています.
  • この均衡 (KL-Z) を最適化することは,特定の生物学的アプリケーションにとって極めて重要です.

研究 の 目的:

  • ロダミン・ラクトン・ズウィテリオンバランスを支配する構造・活性関係を解明する.
  • 新しい有機化学を用いたロダミン染料の総合的なコレクションを開発する.
  • 改良されたロダミン染料の合理的な設計のためのロードマップを提供する.

主な方法:

  • 多様なロダミン染料の合成
  • ラクトン-ズウィテリオンバランスに影響を与える構造-活性関係の調査.
  • 先進的な光画像技術で設計された染料の適用.

主要な成果:

  • アクソクローム置換剤は,ラクトン-ズウィテリオン均衡の重要な調節剤として特定されました.
  • 電子ドナーオキソクロームとフッ素化フェニル環は,単粒子の追跡と多色イメージングのための明るい赤色移転フッ素素を生成します.
  • 光したN-アリルオクソクロームは,光寿命画像顕微鏡によるcAMP検出のための赤色シフトFRETクエンチャー染料を生成する.

結論:

  • ロダミン染料の設計における構造-活性関係が確立された.
  • ロダミン誘導体の合成方法の拡張
  • 生体細胞と特定の分析物質の検出を含む,高度な光成像のための新しい反応剤を生成した.