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Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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相关实验视频

Updated: Jun 4, 2025

Fluorescence Biomembrane Force Probe: Concurrent Quantitation of Receptor-ligand Kinetics and Binding-induced Intracellular Signaling on a Single Cell
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指标与光 基于生命周期的信号读取:结构功能研究

Tatiana R Simonyan1, Larisa A Varfolomeeva2, Anastasia V Mamontova1

  • 1Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Moscow 117997, Russia.

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|December 17, 2024
PubMed
概括
此摘要是机器生成的。

研究人员通过修改GCaMP6骨干开发了新的遗传编码指标 (GECI). 这些新工具提供了更好的时间分辨率和测量活细胞绝对度的能力.

关键词:
飞行员飞行员的飞行员光的寿命 光的寿命基因编码的指标是基因编码的指标.定量成像技术 定量成像技术结构分析是结构分析.

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科学领域:

  • 细胞生物学 细胞生物学
  • 神经科学是一个神经科学.
  • 生物化学 生物化学

背景情况:

  • 离子 (Ca2+) 是细胞过程中的重要信号分子.
  • 基因编码的指标 (GECI) 对于监测活细胞中的Ca2+动态至关重要.
  • 现有的GECI在时间分辨率和绝对度测量方面面临限制.

研究的目的:

  • 在GCaMP6骨干和BrussLEE光蛋白的基础上设计新的GECI.
  • 解决成像方面的挑战,特别是时间分辨率和静态度测量.
  • 在GECI中调查敏感性的结构性决定因素.

主要方法:

  • 两个GECI变体的设计和建造:GCaMP6s-BrUS和GCaMP6s-BrUS-145. 这两种变体的设计和建造.
  • 使用光寿命测量来评估指示器特性.
  • 使用结构确定和比较分析来了解敏感性.
  • 优化GCaMP6s-BrUS以提高分子亮度和时间动态.

主要成果:

  • 在高时间分辨率成像中,GCaMP6s-BrUS表现出减少的,对不敏感的光寿命.
  • GCaMP6s-BrUS-145显示了灵活的,对敏感的光寿命,可通过FLIM来确定绝对度.
  • 结构分析确定了敏感性的关键决定因素.
  • 优化的GCaMP6s-BrUS变体显示出更好的亮度和对敏感的时间行为.

结论:

  • 开发的GECI为不同的成像应用提供了明显的优势.
  • 这些工程指标为研究细胞动态提供了增强的能力.
  • 这些发现为未来开发具有定制性质的先进GECI提供了基础.