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• W2594555719 abstract "Stimulated emission depletion (STED) microscopy is a powerful super-resolution microscopy technique that enables observation of macromolecular complexes and sub-cellular structures with spatial resolution below the diffraction limit. The spatial resolution of STED is limited by power of the depletion laser at the specimen plane. Higher depletion laser power will improve resolution, but at the cost of increased photo-bleaching, photo-toxicity, and anti-stoke emission background. This degrades the signal-to-noise ratio, and can significantly limit STED applications in living specimens. Here, we present an efficient multi-color STED microscopy method based on the digital frequency domain fluorescence lifetime imaging (FastFLIM) and the phasor plots. Our approach utilizes a combination of pulsed excitation and pulsed depletion lasers to record the time-resolved photons by FastFLIM. We demonstrate that the resolution is improved without increasing the depletion laser power by digital separation of the depleted species from the partially depleted species based on their different decay kinetics. We show the utility of this novel STED method applied in both fixed and live cellular samples, and also show its application to fluorescence lifetime correlation spectroscopy (FLCS) measurements. By combining fluorophores with different fluorescence lifetimes, we simultaneously record two-color STED images of cells labeled with Atto655 and Alexa647 in a single scan by using a single pair of excitation and depletion lasers. This novel approach shortens the data acquisition time while minimizing the photo-toxicity caused when using two separate depletion lasers." @default.
• W2594555719 created "2017-03-16" @default.
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• W2594555719 date "2017-02-21" @default.
• W2594555719 modified "2023-10-03" @default.
• W2594555719 title "A novel pulsed STED microscopy method using FastFLIM and the phasor plots" @default.
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• W2594555719 doi "https://doi.org/10.1117/12.2267880" @default.
• W2594555719 hasPublicationYear "2017" @default.
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