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Controlling the TIRF Penetration Depth is Mandatory for Reproducible Results
The main feature of total internal reflection fluorescence (TIRF) microscopy is the employment of an evanescent wave for the excitation of fluorophores instead of using direct light. A property of the…
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冷发光基础原理
自然界中有许多发光过程。冷发光是一系列发光现象的统称,是指不因高温而引发的发光事件。本文描述了不同形式的冷光并对荧光进行了详细介绍。在第二部分解释了描述荧光色素的相关技术术语,如淬灭、漂白或量子效率,以便对荧光分子的基础特性有更深入的了解。
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Total Internal Reflection Fluorescence (TIRF) Microscopy
Total internal reflection fluorescence (TIRF) is a special technique in fluorescence microscopy developed by Daniel Axelrod at the University of Michigan, Ann Arbor in the early 1980s. TIRF microscopy…
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Applications of TIRF Microscopy in Life Science Research
The special feature of TIRF microscopy is the employment of an evanescent field for fluorophore excitation. Unlike standard widefield fluorescence illumination procedures with arc lamps, LEDs or…
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比例成像
细胞的许多基本功能在很大程度上依赖于离子(例如钙、镁)、电压势和细胞质与周围细胞外空间之间的 pH 值的微妙但动态的平衡。这些平衡的变化会显著改变细胞的行为和功能。因此,实时测量细胞内离子、电压和 pH…
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Fluorescence Recovery after Photobleaching (FRAP) and its Offspring
FRAP (Fluorescence recovery after photobleaching) can be used to study cellular protein dynamics: For visualization the protein of interest is fused to a fluorescent protein or a fluorescent dye. A…
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福斯特共振能量转移 (FRET)
荧光描述的是分子或原子在通过光的吸收激发电子系统后,自发发射光子的过程。发射的光子通常能量较低,因此波长较长(斯托克斯位移)。例如,蓝光激发可能导致绿色发射。如果第二个荧光分子能够吸收绿色光子,则该分子的发射再次发生斯托克斯位移,例如变为红色。这种再吸收在浓密样品中会导致测量误差(部分“内滤”效应)。在低浓度样品中,再吸收非常罕见。