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High resolution dual laser flow cytometry

PN Dean and D Pinkel

Flow cytometers based on optical sensing utilize external light sources and fluorescent dyes to measure one or more specific components or properties of individual cells or subcellular particles in liquid suspension. To provide for independent excitation of two dyes used in double staining experiments we have constructed a high resolution flow cytometer that uses two laser beams to provide two wavelengths of excitation. These beams are separated spatially so that cells flow through them sequentially, with a time separation of about 20 musec. Since the dyes are excited sequentially their emission occurs at different times and their emission spectra may overlap without causing any difficulty in analysis. We have developed new light collection optics that permit up to four measurements to be made on each cell. This approach greatly increases the number of dye combinations that can be used in flow cytometry, thus removing a significant limitation of single illumination instruments.

Volume 26, Issue 8, pp. 622-627, 08/01/1978
Copyright © 1978 by The Histochemical Society


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B Trask, G van den Engh, J Landegent, N. in de Wal, and M van der Ploeg
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