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Videos de Conceptos Relacionados

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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Video Experimental Relacionado

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Tintes de absorción de rojo optimizados para imágenes y detección

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
Resumen
Este resumen es generado por máquina.

Los investigadores optimizaron los tintes de rodamina ajustando su equilibrio para obtener mejores imágenes de fluorescencia. Las relaciones estructura-actividad revelaron cómo los sustituyentes controlan las propiedades del tinte para aplicaciones como el seguimiento de una sola partícula y la detección de cAMP.

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Área de la Ciencia:

  • Química orgánica
  • Biofísica y Química
  • Microscopía de fluorescencia

Sus antecedentes:

  • Los tintes de rodamina son andamios de sonda fluorescentes muy versátiles.
  • Su función se basa en un equilibrio entre una lactona incolora y un zwitterion fluorescente.
  • La optimización de este equilibrio (KL-Z) es crucial para aplicaciones biológicas específicas.

Objetivo del estudio:

  • Elucidar las relaciones estructura-actividad que rigen el equilibrio rodamina-lactona-zwitterión.
  • Desarrollar una colección completa de tintes de rodamina utilizando una nueva química orgánica.
  • Proporcionar una hoja de ruta para el diseño racional de tintes de rodamina mejorados.

Principales métodos:

  • Síntesis de una biblioteca diversa de tintes de rodamina.
  • Investigación de las relaciones estructura-actividad que afectan al equilibrio lactona-zwitterión.
  • Aplicación de tintes diseñados en técnicas avanzadas de imágenes de fluorescencia.

Principales resultados:

  • Los sustituyentes de auxocromo fueron identificados como moduladores clave del equilibrio lactona-zwitterión.
  • Los auxocromos donantes de electrones y los anillos fenílicos fluorados producen fluoroforos brillantes y desplazados al rojo para el seguimiento de partículas únicas y la obtención de imágenes multicolores.
  • Los auxocromos de N-arilo con fluoración producen tintes quencher FRET desplazados hacia el rojo para la detección de cAMP a través de la microscopía de imágenes de fluorescencia de por vida.

Conclusiones:

  • Relaciones estructura-actividad establecidas para el diseño de tintes de rodamina.
  • Metodologías sintéticas ampliadas para los derivados de la rodamina.
  • Reactivos novedosos generados para imágenes de fluorescencia avanzadas, incluidas aplicaciones en células vivas y detección de analitos específicos.