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相关概念视频

Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

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Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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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,...
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Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

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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...
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Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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通过BNOSe敏感化进行多色反Stokes光子上转换.

Yaxiong Wei1, Jinsong Shao1, Kai Yi1

  • 1Anhui Province Key Laboratory for Control and Applications of Optoelectronic Information Materials, School of Physics and Electronic Information, Anhui Normal University, Wuhu 241002, P. R. China.

The journal of physical chemistry letters
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概括
此摘要是机器生成的。

这项研究引入了一种新的无金属光敏感剂,用于增强三倍三倍灭绝上转换 (TTA-UC) 和单光子吸收上转换 (SPA-UC). 这一突破使复杂的生物系统能够自我校准氧气传感.

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An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation
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科学领域:

  • 摄影化学的使用.
  • 生物医学传感传感器
  • 材料科学 材料科学 材料科学

背景情况:

  • 三倍-三倍灭绝上转换 (TTA-UC) 是通过减少自光来感知有价值的.
  • 在复杂系统中使用TTA-UC进行定量氧气传感面临局限性.

研究的目的:

  • 开发一种新的无重金属光敏剂,用于改进TTA-UC.
  • 创建一个集成的平台,同时进行TTA-UC和耐氧单光子吸收上转换 (SPA-UC).
  • 为氧气检测建立一个自我校准的传感范式.

主要方法:

  • 多共振架构工程被用来设计一种无重金属光敏剂 (BNOSe).
  • 开发了一个结合TTA-UC和SPA-UC的综合平台.
  • 通过测量上升转换效率和反斯托克斯转移来评估性能.

主要成果:

  • 该BNOSe系统实现了创纪录的TTA-UC量子收益率为19.3%的1.07 eV反斯托克斯转移.
  • 在617nm (色) 和412nm (蓝色) 的双排放是通过深红光激发 (640nm) 实现的.
  • 该平台同时展示了依赖氧气的TTA-UC和耐氧的SPA-UC.

结论:

  • 开发的无金属光敏剂和集成平台克服了基于TTA-UC的氧气传感方面的局限性.
  • 该系统提供了一个自我校准的传感范式,具有生物成像和分析物检测的多模式功能.
  • 这项工作促进了对复杂的生物和化学环境的上转换技术的应用.