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Source: Daniele, F., et. al TIRFM and pH-sensitive GFP-probes to Evaluate Neurotransmitter Vesicle Dynamics in SH-SY5Y Neuroblastoma Cells: Cell Imaging and Data Analysis. J. Vis. Exp. (2015).This video demonstrates the imaging of human neuroblastoma cells using a total internal reflection fluorescence (TIRF) microscope to visualize fluorophore-tagged synaptic vesicles. The cells are first focused in epifluorescence mode. Adjustments are then made to achieve total internal reflection,...
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Source: Winkle, C. C., et al. Utilizing Combined Methodologies to Define the Role of Plasma Membrane Delivery During Axon Branching and Neuronal Morphogenesis. J. Vis. Exp. (2016)This video demonstrates total internal reflection fluorescence (TIRF) microscopy for visualizing exocytic events in cortical neurons. A pH-sensitive green fluorescent protein (GFP) marker fluoresces upon vesicle fusion, with selective TIRF excitation capturing membrane-proximal exocytosis in time-lapse...
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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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