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The first impedance-based flow cytometry device, using the Coulter principle, was disclosed in U.S. Patent 2,656,508, issued in 1953, to Wallace H. Coulter.Mack Fulwyler was the inventor of the forerunner to today's flow cytometers – particularly the cell sorter. [6]
Cell cycle analysis by DNA content measurement is a method that most frequently employs flow cytometry to distinguish cells in different phases of the cell cycle.Before analysis, the cells are usually permeabilised and treated with a fluorescent dye that stains DNA quantitatively, such as propidium iodide (PI) or 4,6-diamidino-2-phenylindole (DAPI).
A Coulter counter played an important role in the development of the first cell sorter, and was involved in the early development of flow cytometry. Some flow cytometers continue to utilize the Coulter principle to provide information about cell size and count.
The cell staining follows the same procedures as in fluorescent staining for flow cytometry. [14] To distinguish between live and dead cells, cells can be probed with rhodium, an intercalator which can only penetrate dead cells. Then all cells are fixed and stained with iridium, which penetrates all cells, to be able to visualize which are ...
Propidium iodide is used as a DNA stain in flow cytometry to evaluate cell viability or DNA content in cell cycle analysis, [2] or in microscopy to visualize the nucleus and other DNA-containing organelles. Propidium Iodide is not membrane-permeable, making it useful to differentiate necrotic, apoptotic and healthy cells based on membrane ...
Flow cytometry cell-sorting yields very high specificity according to one or several surface markers, but one limitation is constituted by the number of cells that can be processed during a work day. For this reason pre-enrichment of the population of interest by immunomagnetic cell sorting is often considered, especially when the target cells ...
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